Installation, Operation and Maintenance Manual IOMM ACZ/AGZ-3 Group: Chiller Part Number: 330411901 Effective: October 2004 Supersedes: IOMM ACZ/AGZ-2 Air-Cooled Scroll Condensing Units ACZ 030B through 155B Air-Cooled Scroll Chillers w/ Remote Evaporators AGZ 026BM through 130BM 60 Hertz, R-22
Table of Contents Introduction .................................................... 3 General Description .................................................... 3 Inspection.................................................................... 3 Nomenclature .............................................................. 3 Installation ...................................................... 4 Handling...................................................................... 4 Location ...............................
Introduction General Description This manual covers two similar product lines: AGZ-BM, Packaged chiller with the evaporator shipped separately for remote installation, field piping to the outdoor unit, and interconnection of wiring. The refrigeration specialties are shipped from the factory for field installation. ACZ-BC, Condensing unit with no evaporator included. For use with customer supplied low side (usually an air-handling unit), field piped and wired to the condensing unit.
Installation Note: Installation is to be performed by qualified personnel who are familiar with local codes and regulations. WARNING Sharp edges on unit and coil surfaces are a potential hazard to personal safety. Avoid contact with them. Handling Be careful to avoid rough handling of the unit. Do not push or pull the unit from anything other than the base. Block the pushing vehicle away from the unit to prevent damage to the sheet metal cabinet and end frame (see Figure 1).
Location Figure 3, Clearances Unit Placement ACZ/AGZ units are for outdoor applications and can be mounted either on a roof or at ground level. For roof mounted applications, install the unit on a steel channel or I-beam frame to support the unit above the roof. For ground level applications, install the unit on a substantial base that will not settle. A one-piece concrete slab with footings extended below the frost line is recommended.
Restricted Air Flow General The clearances required for design-life operation of ACZ/AGZ air-cooled units are described in the previous section. Occasionally, these clearances cannot be maintained due to site restrictions, such as units being too close together, or a fence or wall restricting airflow, or both. The McQuay ACZ/AGZ units have several features that can mitigate the problems attributable to restricted airflow. • The condenser section is configured as shown below.
Case 1, Building or Wall on One Side of One Unit The existence of a screening wall, or the wall of a building, in close proximity to an air-cooled unit is common in both rooftop and ground level applications. Hot air recirculation on the coils adjoining the wall will increase compressor discharge pressure, decreasing capacity and increasing power consumption. Only the compressor(s) connected to these coils will be affected. When close to a wall, place chillers on the north or east-side of them.
Case 2, Two Units Side By Side Two or more units sited side by side are common. If spaced closer than 12 feet (3.7 meters), or 8 feet (2.5meters), depending on size, it is necessary to adjust the performance of each unit. Circuits adjoining each other are affected. NOTE: This case applies only to two units side by side. See Case 3 for three or more parallel units. If one of the two units also has a wall adjoining it, see Case 1.
Case 3, Three or More Units Side By Side When three or more units are side by side, the outside units (1 and 3 in this case) are influenced by the middle unit only on their inside circuits. Their adjustment factors will be the same as Case 2. All inside units (only number 2 in this case) are influenced on both sides and must be adjusted by the factors shown below. Figure 9, Three or More Units Chiller 1 Chiller 2 Chiller 3 Figure 10, Adjustment Factor 4.0 8.0 3.0 6.0 2.0 4.0 1.0 2.
Case 4, Open Screening Walls Decorative screening walls are often used to help conceal a unit either on grade or on a rooftop. These walls should be designed such that the combination of their open area and distance from the unit do not require performance adjustment. It is assumed that the wall height is equal to or less than the unit height when mounted on its base support. This is usually satisfactory for concealment. If the wall height is greater than the unit height, see Case 5, Pit Installation.
Case 5, Pit/Solid Wall Installation Pit installations can cause operating problems and great care should be exercised if they are to be used on an installation. Recirculation and restriction can both occur. A solid wall surrounding a unit is substantially the same as a pit and the data presented here should be used. Steel grating is sometimes used to cover a pit to prevent accidental falls or trips into the pit.
Sound Isolation The low sound level of the ACZ/AGZ units is suitable for most applications. When additional sound reduction is necessary, locate the unit away from sound sensitive areas. Avoid locations beneath windows, or between structures where normal operating sounds can be objectionable. Reduce structurally transmitted sound by isolating refrigerant lines, electrical conduit and the unit itself.
Table 2, Isolator Loads At Each Mounting Location (With Aluminum Fins) ACZ-B Model AGZ-BM Model ACZ 030 AGZ 026 ACZ 035 AGZ 030 ACZ 040 ACZ 045 ACZ 050 AGZ 035 AGZ 040 AGZ 045 ACZ 055 AGZ 050 ACZ 060 AGZ 055 ACZ 065 AGZ 060 ACZ 070 AGZ 065 ACZ 080 AGZ 070 Shipping Wt Operating. Wt Loc. 1 Loc. 2 Loc. 3 Loc.
Table 5, Isolator Locations ACZ-BS, AGZ-BM Less Evaporator Units ACZ- AGZBM BS Model Model Operating Weight lbs kg Neoprene-In-Shear Mountings Spring-Flex Mountings 1 2 3 4 5 6 3 4 (1) 030 026 3600 1631 Black Gray Gray Green - - Orange Purple 1 2 Red Orange 5 6 035 030 3600 1631 Black Gray Gray Green - - Orange Purple Red Orange 040 035 - - 3600 1631 Black Gray Gray Green - - Orange Purple Red Orange - - 045 040 3610 1635 Black Gray Gray Gree
1. Vibration eliminators to reduce vibration and noise transmission to the building. 2. Shutoff valves are required to isolate the unit from the piping system during unit servicing. 3. Manual or automatic air vent valves at the high points of the system. Drains must be installed at the lowest points in the system. 4. Adequate system water pressure must be maintained (expansion tank or regulating valve). 5. Temperature and pressure indicators located at the unit are required to aid in unit servicing. 6.
Figure 18, AGZ 026BM - AGZ 070BM, Typical Field Evaporator Water Piping T Air Vent Strainer Inlet Isolation Valves Vibration Eliminators P Outlet Flow Switch T Thermowell Drain Flow Switch (Model AGZ-BM) Mount a water flow switch in the leaving water line of the remote water chiller to shut down the unit when water flow is interrupted. A flow switch is an equipment protection control and should never be used to cycle a unit. A flow switch is available from McQuay (part number 017503300).
Variable Speed Pumping Variable water flow involves lowering the water flow through the evaporator as the load decreases. McQuay chillers are designed for this duty provided that the rate of change in water flow is slow and the minimum and maximum flow rates for the vessel are not exceeded. The recommended maximum change in water flow is 10 percent of the change per minute. The water flow through the vessel must remain between the minimum and maximum values listed on page 23.
CAUTION Do not use an automotive grade antifreeze. Industrial grade glycols must be used. Automotive antifreeze contains inhibitors which will cause plating on the copper tubes within the chiller evaporator. The type and handling of glycol used must be consistent with local codes. Table 8, Ethylene Glycol Factors for Models AGZ 026BM to 070BM % E.G. 10 20 30 40 50 Freeze Point o F 26 18 7 -7 -28 o C -3.3 -7.8 -13.9 -21.7 -33.3 Capacity Power Flow PD 0.998 0.993 0.987 0.980 0.973 0.998 0.997 0.
Evaporator Temperature Drop Factors Performance tables are based on a 10 degree F (5 degree C) temperature drop through the evaporator. Adjustment factors for applications with temperature ranges from 6 degree F to 16 degree F (3.3 degree C to 8.9 degree C) are found in Table 12 and Table 13. Ranges outside these temperatures can affect the control system's capability to maintain acceptable control and must not be used.
Table 13, Capacity and Power Derates, Models AGZ 075 to 130 Altitude Sea Level 2000 feet 4000 feet 6000 feet 8000 feet 20 Fouling Factor Chilled Water Delta T 0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308) °F °C Cap. Power Cap. Power Cap. Power Cap. Power 6 3.3 0.990 0.997 0.976 0.994 0.937 0.983 0.868 0.964 8 4.4 0.994 0.998 0.981 0.995 0.942 0.984 0.872 0.965 10 5.6 1.000 1.000 0.987 0.996 0.947 0.986 0.877 0.967 12 6.7 1.005 1.
ACZ Compressor Staging Temperature control for the evaporator is provided by the installer through a field supplied and wired temperature controller. The field supplied staging signals are field wired to the Microtech II controller that correspondingly activates and deactivates the scroll compressors. The field supplied temperature controller is required to close normally-open 24 volt contacts on a demand for cooling. These closure signals are field wired to the terminal strip (TB3) in the condensing unit.
The condensing unit section has a liquid line shut-off valve and a suction shut-off valve provided as standard. A holding charge of R-22 is provided for the evaporator (AGZ-BM) and the outdoor section. The installer must properly evacuate the piping system and provide the operating charge of R22. Refer to the piping schematic drawing on page 21 for additional details.
Figure 21, AGZ 026BM – 130BM, Remote Evaporator Pressure Drop 075-085-090 120-130 026-030 035 040 050 045 AGZ Unit Model 026B 030B 035B 040B 045B 050B 055B 060B 065B 070B 075B 085B 090B 100B 110B 120B 130B 060 100-110 065-070 055 Minimum Inch-Pound S.I. gpm DP ft. lps DP kpa 41 1.6 2.6 4.7 45 1.9 2.9 5.7 50 1.9 3.1 5.6 58 1.9 3.6 5.7 64 1.8 4.0 5.4 71 1.8 4.4 5.4 78 1.8 4.9 5.3 86 1.7 5.4 5.2 92 1.6 5.8 4.9 98 1.9 6.2 5.6 111 5.6 7.0 16.5 119 6.3 7.5 18.9 128 7.2 8.1 21.4 146 2.6 9.2 7.7 161 3.
Wind Baffles and Hail Guards Wind Baffles/Hail Guards are a field-installed option that is used to stabilize unit operation in high wind areas and to assist in operation at low ambient temperatures. Figure 22 is a sketch of a typical panel assembly on an ACZ/AGZ unit. The actual number of panels and parts will vary by model size. The parts are shown in the table below and referenced by balloon numbers.
Table 14, Packing List Description Vertical Support Rib Top Cover Front Panel ¼ - 20 x ½” Screw (Place in Poly Bag) Part Number 074758501 330409401 330409501 046093807 Bubble Number 1 2 3 Figure 23, Components TOP REAR (AGAINST UNIT) VERTICAL SUPPORT RIB TOP COVER FRONT PANEL Top Panel, Install Last Overlap the Front panel Front Panel, Install Second Rib, Install First IOMM ACZ/AGZ-3 ACZ / AGZ-BM 25
Physical Data Table 15, ACZ 030B - 040B, AGZ 026BM – 035BM PHYSICAL DATA BASIC DATA ACZ 030B, AGZ 026BM Ckt.1 Number Of Refrigerant Circuits MODEL NUMBER ACZ 035B AGZ 030BM Ckt.2 Ckt.1 2 ACZ 040B AGZ 035BM Ckt.2 Ckt.1 Ckt.2 2 2 Unit Operating Charge, R-22, Lbs. 22 22 22 27 27 27 Unit Operating Charge, R-22, kg 10 10 10 12 12 12 Cabinet Dimensions, LxWxH, In. 94.4 x 88.0 x 100.4 Cabinet Dimensions, LxWxH, (mm) 2398 x 2235 x 2550 2398 x 2235 x 2550 2398 x 2235 x 2550 94.4 x 88.
Table 16, ACZ 045B - 060B, AGZ 040BM – 055BM PHYSICAL DATA MODEL NUMBER ACZ 050B ACZ 055B AGZ 045BM AGZ 050BM ACZ 045B AGZ 040BM BASIC DATA Ckt.1 Number Of Refrigerant Circuits Ckt.1 Ckt.2 2 Ckt.1 Ckt.2 Ckt.1 2 ACZ 060B AGZ 055BM Ckt.2 2 Ckt.2 2 Unit Operating Charge, R-22, lbs. 31 31 37 37 37 37 44 44 Unit Operating Charge, R-22, kg 14 14 17 17 17 17 20 20 Cabinet Dimensions, LxWxH, in. Cabinet Dimensions, LxWxH, (mm) Unit Operating Weight, Lbs. (kg) 94.4 x 88.0 x 100.
Table 17, ACZ 065B - 080B, AGZ 060BM – 070BM PHYSICAL DATA ACZ 065B AGZ 060BM BASIC DATA Ckt.1 Number Of Refrigerant Circuits Ckt.2 MODEL NUMBER ACZ 070B AGZ 065BM Ckt.1 2 Ckt.2 ACZ 080B AGZ 070BM Ckt.1 2 Ckt.2 2 Unit Operating Charge, R-22, lbs. 44 44 50 57 57 57 Unit Operating Charge, R-22, kg 20 20 23 26 26 26 Cabinet Dimensions, LxWxH, in. 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.
Table 18, ACZ 090B - 110B, AGZ 075BM – 090BM PHYSICAL DATA ACZ 090B AGZ 075BM Ckt.1 Ckt.2 2 56 56 25 25 134.9 x 88.0 x 100.4 3426 x 2235 x 2550 5630 (2556) 5510 (2502) 870 (395) MODEL NUMBER ACZ 100B AGZ 085BM Ckt.1 Ckt.2 2 56 66 25 30 134.9 x 88.0 x 100.4 3426 x 2235 x 2550 5790 (2629) 5670 (2574) 870 (395) ACZ 110B AGZ 090BM Ckt.1 Ckt.2 2 66 66 30 30 134.9 x 88.0 x 100.4 3426 x 2235 x 2550 5950 (2701) 5830 (2647) 870 (395) 1 2 14.0 x 5.2 356 x 1585 25 (95) 152 (1047) 300 (2066) 5 (127) 0.5 (12.7) 0.
Table 19, ACZ 120B - 155B, AGZ 100BM – 130BM PHYSICAL DATA ACZ 120B AGZ 100BM Ckt.1 Ckt.2 2 72 82 33 37 173.1 x 88.0 x 100.4 4397 x 2235 x 2550 6970 (3164 6820 (3096) 1155 (524) MODEL NUMBER ACZ 130B ACZ 140B AGZ 110BM AGZ 120BM Ckt.1 Ckt.2 Ckt.1 Ckt.2 2 2 82 82 82 99 37 37 37 45 173.1 x 88.0 x 100.4 173.1 x 88.0 x 100.4 4397 x 2235 x 2550 4397 x 2235 x 2550 7230 (3282) 7480 (3396) 7080 (3214) 7360 (3341) 1155 (524) 1155 (524) BASIC DATA Number Of Refrigerant Circuits Unit Operating Charge, R-22, lbs.
Electrical Data Standard Ambient Table 20, ACZ BC & AGZ BM Electrical Data, Single Point (105°F & below) ACZ Unit Size AGZ Unit Size 030B 026B 035B 030B 040B 035B 045B 040B 050B 045B 055B 050B 060B 055B 065B 060B 070B 065B 080B 070B Volts Minimum Circuit Ampacity (MCA) 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 133 126 80 68 52
Table 21, ACZ BC & AGZ BM Compressor & Fan Motor Amps, Single & Multi-Point (Up to 105°F) ACZ Unit Size AGZ Unit Size 030B 026B 035B 030B 040B 035B 045B 040B 050B 045B 055B 050B 060B 055B 065B 060B 070B 065B 080B 070B All Electrical 32 Rated Load Amps Compressors Volts No. 1 208 25.7 230 24.2 380 14.9 460 13.4 575 9.3 208 25.7 230 24.2 380 14.9 460 13.4 575 9.3 208 31.8 230 29.9 380 18.6 460 16.0 575 12.2 208 33.8 230 33.8 380 22.8 460 16.5 575 13.7 208 33.8 230 33.8 380 22.
Table 22, ACZ BC & AGZ BM Field Wiring, Single Point ACZ Unit Size AGZ Unit Size 030B 026B 035B 030B 040B 035B 045B 040B 050B 045B 055B 050B 060B 055B 065B 060B 070B 065B 080B 070B All Electrical Data IOMM ACZ/AGZ-3 Wiring to Standard Power Block Volts Connector Wire Terminal Range Amps (Copper Wire Only) 208 175 14 GA – 2/0 230 175 14 GA – 2/0 380 175 14 GA – 2/0 460 175 14 GA – 2/0 575 175 14 GA – 2/0 208 380 #4 – 500 kcmil 230 380 #4 – 500 kcmil 380 175 14 GA – 2/0 460 175 14 GA –
Table 23, ACZ BC & AGZ BM Electrical Wiring, Single Point (Up to 105°F) ACZ Unit Size AGZ Unit Size 090B 075B 100B 085B 110B 090B 120B 100B 130B 110B 140B 120B 155B 130B Volts Minimum Circuit Ampacity (MCA) 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 358 358 187 150 125 380 380 219 171 136 414 414 248 188 146 463 463 260 199 171 528 528 282 220 182 613 613 323 248 198 613 613 361 273 212 Power
Table 24, ACZ BC & AGZ BM Compressor and Fan Motor Amps, Single and Multi-Point (Up to 105°F) ACZ Unit Size AGZ Unit Size Rated Load Amps Compressors Volts No. 1 No. 3 No. 5 No. 2 No. 4 No. 6 208 73.1 230 73.1 090B 075B 380 38.2 460 30.1 575 25.2 208 73.1 230 73.1 100B 085B 380 38.2 460 30.1 575 25.2 208 86.4 230 86.4 110B 090B 380 52.5 460 39.0 575 30.0 208 52.8 230 52.8 120B 100B 380 32.7 460 23.7 575 21.8 208 74.5 230 74.5 130B 110B 380 39.8 460 30.6 575 25.2 208 87.9 230 87.9 140B 120B 380 39.
Table 25, ACZ BC & AGZ BM Field Wiring, Single Point ACZ Unit Size AGZ Unit Size 090B 075B 100B 085B 110B 090B 120B 100B 130B 110B 140B 120B 155B 130B All Electrical Data 36 Wiring to Standard Power Block Volts Connector Wire Terminal Range Amps (Copper Wire Only) 208 760 2 GA – 500 kcmil 230 760 2 GA – 500 kcmil 380 380 #4 – 500 kcmil 460 380 #4 – 500 kcmil 575 380 #4 – 500 kcmil 208 760 2 GA – 500 kcmil 230 760 2 GA – 500 kcmil 380 380 #4 – 500 kcmil 460 380 #4 – 500 kcmil 575 380 #4 – 5
Table 26, ACZ BC & AGZ BM Electrical Data, Multi-Point (Up to 105°F) ACZ Unit Size AGZ Unit Size 030B 026B 035B 030B 040B 035B 045B 040B 050B 045B 055B 050B 060B 055B 065B 060B 070B 065B 080B 070B Volts 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 Electrical Circuit #1 Electrical Circuit #2 Max.
Table 27, ACZ BC & AGZ BM Field Wiring, Multi-Point ACZ Unit Size AGZ Unit Size Wiring to Standard Power Block Volts Terminal Amps Cir #1 Cir #2 208 175 175 230 175 175 380 175 175 030B 026B 460 175 175 575 175 175 208 175 175 230 175 175 380 175 175 035B 030B 460 175 175 575 175 175 208 175 175 230 175 175 380 175 175 040B 035B 460 175 175 575 175 175 208 175 175 230 175 175 380 175 175 045B 040B 460 175 175 575 175 175 208 175 175 230 175 175 380 175 175 050B 045B 460 175 175 575 175 175 208 175 175 2
Table 28, ACZ BC & AGZ BM Field Wiring Data ACZ Unit Size AGZ Unit Size Wiring to Standard Power Block Volts Terminal Amps Cir #1 Cir #2 208 380 380 230 380 380 380 175 175 090B 075B 460 175 175 575 175 175 208 380 380 230 380 380 380 175 175 100B 085B 460 175 175 575 175 175 208 380 380 230 380 380 380 175 175 110B 090B 460 175 175 575 175 175 208 380 380 230 380 380 380 175 175 120B 100B 460 175 175 575 175 175 208 380 380 230 380 380 380 380 380 130B 110B 460 380 380 575 175 175 208 380 380 230 380 3
Table 29, ACZ BC & AGZ BM Electrical Data, Multi-Point (Up to 105°F) Electrical Circuit #1 Electrical Circuit #2 Power Power Max. Recomm’d Recomm’d Supply Supply Max.
Electrical Data High Ambient Table 30, ACZ BC & AGZ BM Electrical Data, Single Point ACZ Unit Size AGZ Unit Size 030B 026B 035B 030B 040B 035B 045B 040B 050B 045B 055B 050B 060B 055B 065B 060B 070B 065B 080B 070B Volts Minimum Circuit Ampacity (MCA) 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 147 133 80 68 53 158 144 88 74 59 168
Table 31, ACZ BC & AGZ BM Compressor & Fan Motor Amps, Single & Multi-Point (106°F to 125°F) ACZ Unit Size AGZ Unit Size 030B 026B 035B 030B 040B 035B 045B 040B 050B 045B 055B 050B 060B 055B 065B 060B 070B 065B 080B 070B All Electrical 42 Rated Load Amps Compressors No. R.L.Amps F.L.Amps of Volts Fan Fan Fan No. 1 No. 3 No. 5 No. 2 No. 4 No. 6 Motors Motors Motors No.1 (Each) (Each) 208 29.0 29.0 230 25.7 25.7 380 14.9 14.9 460 13.4 13.4 575 9.5 9.5 208 29.0 29.0 230 25.7 25.
Table 32, ACZ BC & AGZ BM Electrical Data, Multi-Point (106°F to 125°F) ACZ Unit Size AGZ Unit Size 030B 026B 035B 030B 040B 035B 045B 040B 050B 045B 055B 050B 060B 055B 065B 060B 070B 065B 080B 070B Volts 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 Electrical Circuit #1 Electrical Circuit #2 Power Supply Recomm’d Power Supply Recomm’d Max.
Table 33, ACZ BC & AGZ BM Electrical Data, Single Point (Above 105°F) ACZ Unit Size AGZ Unit Size 090B 075B 100B 085B 110B 090B 120B 100B 130B 110B 140B 120B 155B 130B Volts Minimum Circuit Ampacity (MCA) 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 208 230 380 460 575 378 362 194 187 145 398 382 234 200 151 416 401 270 211 157 522 462 273 230 187 612 526 307 263 211 612 571 352 286 219 613 613 393 307 228 Power S
Table 34, ACZ BC & AGZ BM Compressor and Fan Motor Amps, Single & Multi-Point (106°F to 125°F ACZ Unit Size AGZ Unit Size 090B 075B 100B 085B 110B 090B 120B 100B 130B 110B 140B 120B 155B 130B All Electrical Rated Load Amps Compressors No. R.L.Amps F.L.Amps of Volts Fan Fan Fan No. 1 No. 3 No. 5 No. 2 No. 4 No. 6 Motors Motors Motors (Each) (Each) 208 78.0 78.0 230 74.1 74.1 380 39.8 39.8 460 38.8 38.8 575 29.9 29.9 208 78.0 78.0 230 74.1 74.1 380 39.8 39.8 460 38.8 38.8 575 29.9 29.
Table 35, ACZ BC & AGZ BM Electrical Data, Multi-Point (106°F) Electrical Circuit #1 Electrical Circuit #2 Power Power Max. Recomm’d Recomm’d ACZ AGZ Supply Supply Max.
Notes for “Electrical Data Single- and Multi-Point” Power: 1. Unit wire size ampacity (MCA) is equal to 125% of the largest compressor-motor RLA plus 100% of RLA of all other loads in the circuit including the control transformer. 2. The control transformer is furnished on the unit and no separate 115V power is required. For both single- and multi-point power connections, the control transformer is in circuit #1 with control power wired from there to circuit #2.
Figure 24, AGZ-BM, Typical Field Wiring Diagram DISCONNECT (BY OTHERS) UNIT MAIN TERMINAL BLOCK GND LUG 3 PHASE TO COMPRESSOR(S) AND FAN MOTORS POWER NOTE: ALL FIELD WIRING TO BE INSTALLED AS NEC CLASS 1 WIRING SYSTEM WITH CONDUCTOR RATED 600 VOLTS FIELD SUPPLIED OPTION FUSED CONTROL CIRCUIT TRANSFORMER 120 VAC DISCONNECT (BY OTHERS) TB1-20 N 10A FUSE 120VAC CONTROL POWER (BY OTHERS) TB1 CONTROL CIRCUIT FUSE 1 2 35 120 VAC N 33 CHW PUMP RELAY (BY OTHERS) 120 VAC 1.
Figure 25, ACZ-B, Typical Field Wiring Diagram DISCONNECT (BY OTHERS) UNIT MAIN TERMINAL BLOCK GND LUG 3 PHASE TO COMPRESSOR(S) AND FAN MOTORS POWER NOTE: ALL FIELD WIRING TO BE INSTALLED AS NEC CLASS 1 WIRING SYSTEM WITH CONDUCTOR RATED 600 VOLTS FIELD SUPPLIED OPTION N FUSED CONTROL CIRCUIT TRANSFORMER 120 VAC DISCONNECT (BY OTHERS) TB1-20 10A FUSE 120VAC CONTROL POWER TB1 CONTROL CIRCUIT FUSE 1 (BY OTHERS) 2 120 VAC 35 N 33 OPTIONAL DX EVAP FAN RELAY (BY OTHERS) 120 VAC 1.
Dimensional Data Figure 26, Dimensions: ACZ 030B - 080B AGZ 026BM – 070BM ISOLATOR LOCATIONS ON BOTTOM OF RAIL 67.8 (1721) COMPRESSOR COMPRESSOR CIRCUIT #1 CIRCUIT #2 13.3 (338) 13.3 (338) REFRIGERANT CONNECTIONS SUCTION LINE #2 SUCTION LINE #1 HOT GAS BYPASS #1 HOT GAS BYPASS #2 LIQUID LINE #1 25.0 (636) LIQUID LINE #2 2.0 (51) 8.9 (226) 51.2 (1301) CONTROL PANEL CONTROL PANEL POWER ENTRY POINT 0.875 KNOCK OUT FIELD CONTROL CONNECTION 100.4 (2550) SUCTION CONN. Y 43.8 (1111) 25.
Figure 27, Dimensions: ACZ 090B - 110B AGZ 075BM – 090BM ISOLATOR LOCATIONS ON BOTTOM OF RAIL 110.1 (2797) 12.4 (315) COMPRESSORS CIRC #2 12.4 (315) REFRIGERANT CONNECTIONS 2.0 (51) SUCTION LINE #2 53.7 (1365) SUCTION LINE #1 HOT GAS BYPASS #2 47.9 (1218) 40.0 (1017) 34.3 (870) 2.0 (51) 51.3 (1304) HOT GAS BYPASS #1 LIQUID LINE #2 LIQUID LINE #1 COMPRESSORS CIRC #1 CONTROL PANEL POWER ENTRY POINT 0.875 KNOCK OUTS CONTROL PANEL FIELD CONTROL CONNECTION 100.4 (2550) Y 28.5 (724) 6.
Figure 28, Dimensions: ACZ 120B - 155B AGZ 100BM – 130BM ISOLATOR LOCATIONS ON BOTTOM OF RAIL 67.8 (1721) 67.8 (1721) 12.4 COMPRESSORS CIRC #2 (315) 25.2 (640) REFRIGERANT CONNECTIONS 2.0 (51) 53.73 (1364.7) 48.00 (1319.2) 39.95 (1014.7) 34.22 (869.2) SUCTION LINE #2 SUCTION LINE #1 HOT GAS BYPASS #2 HOT GAS BYPASS #1 2.0 (51) LIQUID LINE #2 COMPRESSORS CIRC #1 82.4 (2093) LIQUID LINE #1 CONTROL PANEL CONTROL PANEL FIELD CONTROL CONNECTION 17.6 (447) 23.9 (114) POWER ENTRY POINT 0.
Remote Evaporators Figure 29, Remote Evaporators, AGZ 026BM – 130BM 8.3 (211) = = Suction Circuit #2 Suction Circuit #1 .85 (22) W1 Inlet 32.9 (838) Liquid Circuit #1 1.9 (49) M10x25 .67 (17) 11.4 (290) 13.5 (342) AGZ Model 026 030 035 040 045 050 055 060 065 070 .87 (22) 1.9 (49) Liquid Line Conn. Brazed, in 1.375 1.375 1.375 1.375 1.375 1.375 1.375 1.375 1.375 1.375 .87 (22) 1.9 (49) A Suction Line Conn. Brazed, in (S). 2.125 2.125 2.125 2.125 2.125 2.125 2.125 2.625 2.625 2.
Optional Features Any of the following options can be included on a unit: Controls Hot Gas Bypass Hot gas bypass permits unit operation down to 10% of full load capacity. This option includes a factory-mounted hot gas bypass valve, solenoid valve, and manual shutoff valve for each circuit. Head Pressure Control Fan VFD low ambient control allows unit operation down to 0°F (-18°C). (Not available on 380 volt, 60 Hertz units.
The interface kits on the MicroTech II controller are as follows: • BACnet Kit P/N 350147404: BACnet/IP, BACnet MS/TP, or BACnet Ethernet • LONWORKS Kit P/N 350147401: LonTalk (FTT-10A) • Modbus RTU The following functions are available through the BAS where possible. Exact capabilities can vary depending on the protocol in use. • Enable/Disable chiller operation by setting the Unit Enable setpoint. • Select the operating mode by setting the Unit Mode setpoint.
Refrigerant Specialties Kit Required on AGZ-BM Remote Evaporator units consisting of thermal expansion valve, solenoid valve, sight glass and filter-drier (sealed on Models 026 to 070, replaceable core on Models 075 to 130). Electrical Multi-Point Electrical Connection Provides a power connection to each of the unit’s two electrical circuits.
AGZ MicroTech II¥ ¥ Controller Software Version AGZD20101A Table of Contents Overview .............................................................................58 Inputs/Outputs ................................................................58 Setpoints ........................................................................60 Shutdown Alarms ...........................................................61 Limit Alarms ..................................................................62 Control Logic. ...
Overview MicroTech II controller’s state-of-the-art design not only permits the chiller to run more efficiently, but also simplifies troubleshooting if a system failure occurs. Every MicroTech II controller is programmed and tested prior to shipment to facilitate start-up. The AGZ-AM controller software is identical to the software used in the AGZ-AS packaged chiller. Some field wiring is required between the remote evaporator and the outdoor unit.
Table 39, Digital Inputs # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Description Unit OFF Switch Pump Down Switch #1 Evaporator Water Flow Switch Open Open Pump Down Switch #2 Open Open Phase Voltage Fault #1 (See Note 1) Phase Voltage Fault #2 (See Note 1) Ground Fault Prot. #1 (See Note 2 Below) Ground Fault Prot.
Setpoints The setpoints shown in Table 41 are battery-backed and remembered during power off, are factory set to the Default value, and can be adjusted within the values shown in Range. The PW (password) column indicates the password.
Automatic Adjusted Ranges The following are setpoints that will be limited based on the option selected.
Table 42, Shutdown Alarms High Condenser Pressure Condenser Press > High Condenser Pressure SP Mechanical High Condenser Pressure/Motor Protect Digital Input = Off On Power Up: Delay 150 Sec. before checking Action Taken Rapid Stop Unit Rapid Stop Circuit Rapid Stop Circuit Rapid Stop Circuit Phase Voltage Protection (opt.) If Phase Voltage Protection = Y, Then Digital Input Off= Phase/Voltage Problem Rapid Stop Circuit Ground Fault Protection (opt.
Control Logic Unit Enable Enabling and disabling the chiller is controlled by the Unit Enable Setpoint, with options of OFF and ON. This setpoint can be altered by the Unit Off Input, Digital Input, keypad entry, or BAS request. The Control Source setpoint determines which source can change the Unit Enable setpoint with options of DIGITAL INPUT, KEYPAD, or BAS. Changing the Unit Enable Setpoint can be accomplished according to the following table.
Unit Test Mode The unit test mode allows manual testing of controller outputs. Entering this mode requires the following conditions: • Unit OFF input = OFF (i.e., entire chiller is shut down). • Manager password active. • Available Unit Mode setpoint = TEST. A test menu can then be selected to allow activation of the outputs. It is possible to switch each digital output ON or OFF and set the analog outputs to any value.
Required Parameters • • • • Number of starts for all compressors Number of run-hours for all compressors Status of all compressors (Available/Unavailable) Compressor number Compressor Start/Stop Timing-Cool Mode This section defines when a compressor is to start, or stop, and the scenario for doing so. Required Parameters 1. 2. 3. 4. 5. 6. 7. 8.
Ice timer status (12 hours between starts) Stage Up For 2 compressors/circuit: Control band = Evap Delta T x .3 For 3 compressors/circuit: Control band = Evap Delta T x .2 IF [LWT Error > Startup_Delta_T_SP + 0.
risen above the unload setpoint, another compressor will be stopped. The last compressor on a circuit will not stop due to the unload condition. High Condenser Pressure If the discharge pressure rises above the High Condenser Pressure Unload setpoint, and more than one compressor on the circuit is running, the circuit will stage down.
Pumpdown When a circuit reaches a condition where it needs to shut down normally, a pumpdown cycle will be performed. All but the lowest numbered running compressor will shut off. During pumpdown, the hot gas bypass and liquid line valves are closed, while a compressor continues to run. The pumpdown is complete when the evaporator pressure is less than the low evaporator pressure unload setpoint, less 15 psi, or the circuit has been in the pumpdown state for 60 seconds.
Stage Up Error Step deadband). = Saturated Condenser Refrigerant temperature – (Target + Stage Up The Stage Up Error Step is added to Stage Up Accumulator once every Stage Up Error Delay seconds. When Stage Up Error Accumulator is greater than the Stage Up Error Setpoint another stage is started. When a stage up occurs or the saturated condenser temperature falls back within the Stage Up deadband the Stage Up Accumulator is reset to zero.
What is an Inverter? The term inverter and variable-frequency drive are related and somewhat interchangeable. An electronic motor drive for an AC motor controls the motor’s speed by varying the frequency of the power sent to the motor. An inverter, in general, is a device that converts DC power to AC power. The figure below shows how the variable-frequency drive employs an internal inverter. The drive first converts incoming AC power to DC through a rectifier bridge, creating an internal DC bus voltage.
Key and Indicator Legend Run/Stop LED - ON when the inverter output is ON and the motor is developing torque (Run Mode), and OFF when the inverter output is OFF (Stop Mode). Program/Monitor LED - This LED is ON when the inverter is ready for parameter editing (Program Mode). It is OFF when the parameter display is monitoring data (Monitor Mode). Run Key Enable LED - is ON when the inverter is ready to respond to the Run key, OFF when the Run key is disabled.
Troubleshooting Tips The table below lists typical symptoms and the corresponding solution(s). Symptom Condition Probable Cause • Is the frequency command source A_01 parameter setting correct? • Is the Run command source A-02 parameter setting correct? • Is power being supplied to terminals [L1], [L2], and [L3/N]? If so, the POWER lamp should be ON. • Is there an error code E X X displayed? The inverter outputs [U], [V], [W] are not supplying voltage. The motor will not run.
Monitoring Trip Events, History. & Conditions Fault Detection and Clearing The microprocessor in the inverter detects a variety of fault conditions and captures the event, recording it in a history table. The inverter output turns OFF, or “trips” similar to the way a circuit breaker trips due to an over-current condition. Most faults occur when the motor is running (refer to the diagram to the right). However, the inverter could have an internal fault and trip in Stop Mode.
Trip History and Inverter Status Always find the cause of the fault before clearing it. When a fault occurs, the inverter stores important performance data at the moment of the fault. To access the data, use the monitor functions (D_xx) and select D_08 for details about the present fault (En), or the error code for the past two trip events (E n-1) and E n-2) using the D_09 Trip History function. The following Monitor Menu map shows how to access the error codes.
Important Messages WARNING WARNING HIGH VOLTAGE: Motor control equipment and electronic controllers are connected to hazardous line voltages. When servicing drives and electronic controllers, there may be exposed components with housings or protrusions at or above line potential. Extreme care should be taken to protect against shock. Stand on an insulating pad and make it a habit to use only one hand when checking components. Always work with another person in case an emergency occurs.
Standard Functions “A” Group Parameters Function Code 76 Name McQuay Setting “A” Group Parameters Function Name Code McQuay Setting A_01 A_02 A_03 Frequency source setting Run command source setting Base frequency setting 01 01 60.0 A_53 A_54 DC braking wait time DC braking force during deceleration 0.0 0 A_55 DC braking time during deceleration 0.0 A_04 Maximum frequency setting 60.0 A_61 Frequency upper limit setting 0.
Intelligent Terminal Functions Fine Tuning Functions “B” Group Parameters Function Code B_01 B_02 B_03 B_12 Name Selection of automatic restart Allowable under-voltage power failure time Retry wait time before motor restart Level of electronic thermal setting McQuay Setting 00 1.0 “C” Group Parameters Function Code Name McQuay Setting C_01 C_02 C_03 Terminal [1] function Terminal [2] function Terminal [3] function 00 01 16 1.
Using the Controller 4x20 Display & Keypad Layout The 4-line by 20-character/line liquid crystal display and 6-key keypad are shown below. Figure 30, Display (in MENU mode) and Keypad Layout Key-to-Screen Pathway MENU Key Air Conditioning < ALARM VIEW < SET < ARROW Keys (4) ENTER Key Note that each ARROW key has a pathway to a line in the display. Pressing an ARROW key will activate the associated line when in the MENU mode.
Version Number The software version number is displayed during power up (see above) and can be accessed at any time by pressing the MENU Key and the ENTER Key simultaneously. Navigating Through the Menus The menus are arranged in a matrix of screens across a top horizontal row. Some of these top-level screens have sub-screens located under them. The general content of each screen and its location in the matrix are shown in Figure 32 on page 80. A detailed description of each menu begins on page 81.
Figure 32, Menu Matrix "MENU" "VIEW" MENUS VIEW UNIT VIEW UNIT VIEW CIR #1 VIEW CIR #2 STATUS (1) TEMP (1) STATUS (1) STATUS (1) VIEW REFRIG CIR VIEW REFRIG CIR #1 STATUS (1) #2 STATUS (1) VIEW FAN S (1) VIEW UNIT TEMP (2) VIEW UNIT VIEW CIR #1 VIEW CIR #2 STATUS (5) STATUS (4) STATUS (4) VIEW REFRIG CIR VIEW REFRIG CIR #1 STATUS (3) #2 STATUS (2) VIEW FAN S (3) ⇐ Continued ⇐ (Right side of matrix continued from above) "ALARM" MENUS "SET" MENUS ALARM LOG ACTIVE ALARM (1) SET UNIT (LAS
After pressing the “VIEW” menu key, a menu screen will show: VIEW < UNIT < COMPRESSOR < REFRIGRANT < FANS UP ARROW KEY Selection of any of these will advance to the appropriate data menu. For example, after pressing the “REFRIGERANT” menu button, the selected data screen will show: VIEW REFRIG PSI SAT EVAP XXX.X SAT COND XXX.X °F XX.X XX.X The ARROW keys will automatically return to the “scroll” mode at this time. Screen Definitions: This section contains information on each menu screen.
VIEW UNIT STATUS (5) D.I. 111111111 123456789012345678 111111111111111111 This menu gives the status of digital inputs (D.I.). 1=ON, 0=OFF. Numbers are 1 through 18. See Table 39, Digital Inputs, on page 59 for number reference. VIEW UNIT Analog (volts 1=XXX.X STATUS (6) Outputs X 100) 2=XXX.X This menu give the output voltage for fans #1 and #2 optional VFD. Divide by 100 for actual voltage. View Unit Temperatures VIEW UNIT TEMP (1) Evap LWT = XXX.X °F OAT = XXX.X °F LWT Target = XX.
VIEW CIR1 STATUS (4) Comp5=Off Hours= XXXXX Starts= XXXXX View Refrigerant Screens The following three screens are duplicated for circuit #2: VIEW REFRG CIR 1 (1) Evap Press= XXX.Xpsi Cond Press= XXX.Xpsi VIEW REFRG CIR 1 (2) Sat Evap= XXX.X oF Sat Cond= XXX.X oF VFD Target= XXX.X oF VIEW REFRG Suct Temp= Superheat= Evap Appr= CIR 1 (3) XXX.X oF XXX.X oF XX.X oF Evap Appr (evaporator approach) is the difference between the leaving fluid temperature and the saturated evaporator temperature.
ALARM MENUS Alarm Log Alarm Log (X) Alarm Description Time/Date Data:Edit and scroll The last 25 alarms, either shutdown or limit, are shown in this menu with earlier alarm menus stored under it. ARROW DOWN from this menu will go to the next-to-last alarm, ARROW DOWN again will go to the second from last, and so on through the last 25 occurrences. The screens are numbered (1), (2), (3),....(X). Active Alarm Alarm Active Alarm Description Time/Date .
to Level when the password is entered properly. Setpoints can now be changed. Once entered, a password remains valid for 15 minutes after the last key-press. 2. Select the desired menu by scrolling through SET menus with the UP, DOWN, LEFT and RIGHT ARROWS. Alternatively, press the MENU button, select the type of setpoint desired, then scroll up or down to the desired menu screen. 3.
Unit Mode settings can be: 1. COOL, normal setting used with chilled water air-condition applications. 2. COOL w/GLYCOL, used with low temperature glycol applications. It allows a lower LWT setpoint to be used. 3. ICE w/GLYCOL, used with ice storage systems, allows changing from chilled glycol operation to lower temperature ICE operation. In ICE, the unit runs at full load until the ICE setpoint is reached, at which time the unit shuts off.
SET UNIT SPs (8) Units = °F/psi Lang = ENGLISH Units settings are only °F/psi at the present time. °C/kPa will be available later. Lang (Language) settings can be only ENGLISH at present. SET UNIT SPs (9) Protocol = MODBUS Ident Number=001 Baud Rate=9600 Ident Number and Baud Rate are in effect when BAS is selected in the SET screen. SET UNIT SPs (10) Evap Pressure Sensor Cir1 Offset= XX.Xpsi Cir2 Offset= XX.
Set Comp Setpoints SET COMP SPs (1) # of Compressors =X Stop-Start =XXmin Start-Start =XXmin This menu sets the anti-recycle timers. Stop-Start is the time required before starting a compressor after it has stopped. Start-Start is the time required before starting a compressor after the last time it has started. It is recommended that these default values not be changed.
SET ALARM LMTS (4) PhaseVoltage=YES/NO GroundFault=YES/NO Fan Stages SET FANS SPs (1) Number of Fans = X Fan VFD = YES/NO The Number of Fans line tells the controller the number of fans on the unit. The UP ARROW toggles between 4, 6 and 8. Fan VFD tells the controller whether the optional low ambient fan VFD is installed in the unit. The UP ARROW toggles between YES and NO. The setting changes the range available: YES = -2°F to 60°F, NO = 35°F to 60°F.
TEST MENUS The field test screens are only available when the unit is in TEST mode. Using these screens, any digital output can be controlled manually. TEST UNIT (1) Alarm Signal=Off EvapWaterPump=Off TEST UNIT (2) Liq Line Sol 1=Off Compressor HG1=Off 1=Off 3=Off 5=Off TEST UNIT (3) Liq Line Sol 2=Off Compressor HG2=Off 2=Off 4=Off 6=Off TEST UNIT Fan 1= Off Fan 3= Off Fan 5/7= Off (4) TEST UNIT Fan 2= Off Fan 4= Off Fan 6/8= Off (5) TEST UNIT (6) Fan VFD 1= 000.0% Fan VFD 2= 000.
ACZ Microtech II Controller Software Version ACZD20101A Table of Contents Overview .............................................................................92 Inputs/Outputs ................................................................92 Setpoints ........................................................................94 Shutdown Alarms ...........................................................95 Limit Alarms ..................................................................96 Control Logic. ...
Overview The MicroTech II controller’s state-of-the-art design not only permits the condensing unit to run more efficiently, but also simplifies troubleshooting if a system failure occurs. Every MicroTech II controller is programmed and tested prior to shipment to facilitate start-up.
Table 49, Digital Inputs # Description Type Signal Signal 1 Unit Switch UT 0 VAC (Stop) 24 VAC (Auto) 2 Pump Down Switch #1 C1 0 VAC (Stop) 24 VAC (Start) 3 Evaporator Flow Switch UT 0 VAC (No Flow) 24 VAC (Flow) 4 Stage #1 C1 0 VAC (Off) 24 VAC (On) 5 Stage #2 C2 0 VAC (Off) 24 VAC (On) 6 Pump Down Switch #2 C2 0 VAC (Stop) 24 VAC (Start) 7 Stage #3 C1 0 VAC (Off) 24 VAC (On) 8 Stage #4 C2 0 VAC (Off) 24 VAC (On) 9 Phase Voltage Fault #1 (See Note 1 Below) C1
Setpoints The following parameters are remembered during power off, are factory set to the Default value, and can be adjusted to any value in the Range column. The PW (password) column indicates the password that must be active in order to change the setpoint.
Automatic Adjusted Ranges The following are setpoints that are limited based on the option selected.
Events (Limit Alarms) The following alarms do not cause a rapid shutdown, but limit operation of the chiller in some way as described in the Action Taken column. All limit alarms do the following while active: • Appear in the active alarm menu • Light the alarm signal on the controller • Log the alarm in the Alarm Log.
Table 57, Unit Enable Conditions Unit Off Input Control Source Setpoint Remote Input Keypad Entry BAS Request Unit Enable OFF x x x x OFF x SWITCHES OFF x x OFF ON SWITCHES ON x x ON ON KEYPAD x OFF x OFF ON KEYPAD x ON x ON ON NETWORK x x OFF OFF ON NETWORK OFF x x OFF ON NETWORK ON x ON ON NOTE: An “x” indicates that the value is ignored.
Compressor Start/Stop Timing This section defines when a compressor is to start, or stop, and the scenario for doing so. Required Parameters 1. 2. 3. 4.
High Ambient Limit On units not configured with multi-point power connections, the maximum load amps could be exceeded at high ambient temperatures. If all circuit 1 compressors are running or all but one compressor on circuit 1, power connection is single point, and the OAT is greater than 116°F, circuit 2 is limited to running all but one compressor. The circuit 2 status will indicate if this is the case. This action will allow the unit to operate at higher temperatures than 116°F.
Evaporator Fan Interlock The Evap Fan can be cycled by the controller. If the unit is enabled and at least one circuit is able to run, the controller sends a signal to start the fan (wired from terminals #33 and #35 on TB1). If airflow is sensed from an air flow switch or auxiliary contact (wired to terminals #44 and #61 on TB1) for a settable time interval (10 second default value), the unit will be ready to start at a call for cooling.
Normal Operation - Staging Up At startup, the first fan will start when the saturated condenser temperature rises above the target. After this, the stage up deadbands apply. When the saturated condenser temperature is above the Target + the active deadband, a Stage Up error is accumulated. Stage Up Error Step deadband) = Saturated Condenser Refrigerant temperature – (Target + Stage Up The Stage Up Error Step is added to Stage Up Accumulator once every Stage Up Error Delay seconds.
Optional VFD Low Ambient Fan Control Low ambient air temperature fan control is accomplished by using the Optional Low Ambient VFD to control the speed of the first fan on each circuit. This VFD control uses a proportional integral function to drive the saturated condenser temperature to a target value by changing the fan speed. The target value is normally the same as the saturated condenser temperature target setpoint.
Inverter Front Panel Keypad The CR100 Series inverter front keypad contains all the elements for both monitoring and programming parameters. The keypad layout is pictured below. The fan VFD is programmed in the factory before shipment and no field programming is required. Key and Indicator Legend Run/Stop LED - ON when the inverter output is ON and the motor is developing torque (Run Mode), and OFF when the inverter output is OFF (Stop Mode).
Keypad Navigational Map The CR100 Series inverter front keypad contains all the elements for both monitoring and programming parameters. The diagram below shows the basic navigational map of parameters and functions. NOTE: The inverter 7-segment display shows lower case “b” and “d,” meaning the same as the upper case letters “B” and “D” used in this manual (for uniformity “A to F”).
Troubleshooting Tips The table below lists typical symptoms and the corresponding solution(s). Symptom Probable Cause Condition • Is the frequency command source A_01 parameter setting correct? Is the Run command source A-02 parameter setting correct? • • Is power being supplied to terminals [L1], [L2], and [L3/N]? If so, the POWER lamp should be ON. • • Is there an error code E X X displayed? • Press the Func. key and determine the error type.
Symptom Condition Inverter data is not correct. A parameter will not change after an edit (reverts to old setting). Probable Cause Solution • Was power turned OFF after a parameter edit but before pressing the Store key? • Edit the data and press the Store key once. • Edits to data are permanently stores at power down. Was the time from power OFF to power ON less than six seconds? • Wait six seconds or more before turning power OFF after editing data. A download to the inverter was attempted.
Error Codes An error code will appear on the display automatically when a fault causes the inverter to trip.
The following Monitor Menu map shows how to access the error codes. When fault(s) exist, you can review their details by first selecting the proper function: D_08 displays current trip data, and D09 displays trip history.
Important Messages WARNING WARNING HIGH VOLTAGE: Motor control equipment and electronic controllers are connected to hazardous line voltages. When servicing drives and electronic controllers, there may be exposed components with housings or protrusions at or above line potential. Extreme care should be taken to protect against shock. Stand on an insulating pad and make it a habit to use only one hand when checking components. Always work with another person in case an emergency occurs.
Standard Functions “A” Group Parameters Function Code 110 Name McQuay Setting “A” Group Parameters Function Name Code McQuay Setting A_01 A_02 A_03 Frequency source setting Run command source setting Base frequency setting 01 01 60.0 A_53 A_54 DC braking wait time DC braking force during deceleration 0.0 0 A_55 DC braking time during deceleration 0.0 A_04 Maximum frequency setting 60.0 A_61 Frequency upper limit setting 0.
Intelligent Terminal Functions Fine Tuning Functions “B” Group Parameters Function Code B_01 B_02 B_03 B_12 Name Selection of automatic restart Allowable under-voltage power failure time Retry wait time before motor restart Level of electronic thermal setting McQuay Setting 00 1.0 “C” Group Parameters Function Code C_01 C_02 C_03 Name McQuay Setting Terminal [1] function Terminal [2] function Terminal [3] function 00 01 16 1.
Using the Controller 4x20 Display & Keypad Layout The 4-line by 20-character/line liquid crystal display and 6-key keypad are shown below. Figure 33, Display (in MENU mode) and Keypad Layout Key-to-Screen Pathway MENU Key Air Conditioning < ALARM VIEW < SET < ARROW Keys (4) ENTER Key Note that each ARROW key has a pathway to a line in the display. Pressing an ARROW key will activate the associated line when in the MENU mode.
Navigating Through the Menus The menus are arranged in a matrix of screens across a top horizontal row. Some of these top-level screens have sub-screens located under them. The general content of each screen and its location in the matrix are shown in Figure 35 on page 114. A detailed description of each menu begins on page 115. There are two ways to navigate through the menu matrix to reach a desired menu screen. 1.
Figure 35, Menu Matrix "MENU" "VIEW" MENUS VIEW UNIT VIEW UNIT VIEW CIR #1 VIEW CIR #2 STATUS (1) TEMP (1) VIEW UNIT STATUS (1) STATUS (1) VIEW CIR #1 VIEW CIR #2 STATUS (6) STATUS (4) STATUS (4) VIEW REFRIG CIR VIEW REFRIG CIR #1 STATUS (1) #2 STATUS (1) VIEW REFRIG CIR VIEW REFRIG CIR #1 STATUS (2) #2 STATUS (2) VIEW FAN S (1) VIEW FAN S (3) ⇐ Continued ⇐ (Right side of matrix continued from above) "ALARM" MENUS "SET" MENUS ALARM LOG ACTIVE ALARM SET UNIT SET COMP SET ALARM SET FA
After pressing the “VIEW” menu key, a menu screen will show: VIEW < UNIT < COMPRESSOR < REFRIGRANT < FANS UP ARROW KEY Selection of any of these will advance to the appropriate data menu. For example, after pressing the “REFRIGERANT” menu button, the selected data screen will show: VIEW REFRIG PSI SAT EVAP XXX.X SAT COND XXX.X °F XX.X XX.X The ARROW keys will automatically return to the “scroll” mode at this time. Screen Definitions This section contains information on each menu screen.
VIEW UNIT STATUS (4) D.O. 111111111 123456789012345678 111111111111111111 This menu gives the status of digital outputs (D.O.), 1=ON, 0=OFF. Numbers are 1 through 18. See Digital Outputs on page 93 for number reference. VIEW UNIT STATUS (5) D.I. 111111111 123456789012345678 111111111111111111 This menu gives the status of digital inputs (D.I.). 1=ON, 0=OFF. Numbers are 1 through 18. See Digital Inputs on page 93 for number reference. VIEW UNIT Analog (volts 1=XXX.X STATUS (6) Outputs X 100) 2=XXX.
View Refrigerant Status VIEW REFRG CIR 1 (1) Evap Press= XXX.Xpsi Cond Press= XXX.Xpsi The evaporator pressure is measured at the compressor’s common suction line and should be considered as suction pressure rather than evaporator pressure. VIEW REFRG CIR 1 (2) Sat Evap= XXX.X oF Sat Cond= XXX.X oF VFD Target= XXX.X oF Screens #1 and #2 above are repeated for circuit #2.
Active Alarm Alarm Active Alarm Description Time/Date . Alarm Active No more alarms Press ENTER to clear all active alarms If the unit is off on a shutdown alarm, or running but in a limit alarm condition, the cause, date/time, and UNIT STATUS will appear in the ALARM ACTIVE screen. The remote alarm relay will close, and a red light will appear behind the LEFT button. The light will go out when the fault is cleared.
6. Enter the desired value or word into the controller by pressing the ENTER key. Note that pressing the
SET UNIT SPs (4) CLOCK dd/mm/yyyy hh:mm weekday SET UNIT SPs (5) Units = °F/psi Lang = ENGLISH Units settings are only °F/psi at the present time. °C/kPa will be available later. Lang (Language) settings can be only ENGLISH at present. SET UNIT SPs (6) Protocol = Modbus Ident Number=001 Baud Rate=9600 Ident Number and Baud Rate are in effect when BAS is selected in the SET screen (Modbus only). SET UNIT SPs (7) Evap Pressure Sensor Cir1 Offset= XX.Xpsi Cir2 Offset= XX.
SET COMP SPs (2) InterStgUp= XXXsec InterStgDn= XXXsec Clear Cycle Tmrs=no InterStageUp is the time delay since the last stage change before a compressor can stage on. InterStageDn is the time delay since the last stage change before a compressor can stage off normally (not by an alarm). Set Alarm Screens SET ALARM LIMITS (1) LowEvPrHold=XXXpsi LowEvPrUnld=XXXpsi The LowEvPrHold and LowEvPrUnld have the same default value of 59 psi.
SET FANS SPs (4) VFD Min Speed= XX% VFD Max Speed= XXX% SET FANS SPs (5) Cond Sat Temp Target Setpoint= XXX.X °F SET FANS SPs (6) # Fans On At Startup >75°°F >90°°F >105°°F 1 2 3 Screen Definitions – TEST The field test screens are only available when the unit is in TEST mode. Using these screens, any digital output can be controlled manually.
Start-up Pre Start-up The unit must be inspected to see that no components became loose or damaged during shipping or installation. Start-Up There should be adequate building load (at least 50 percent of the unit full load capacity) to properly check the operation of the unit’s refrigerant circuits. Record all operating parameters required by the “Compressorized Equipment Warranty Form”.
Shutdown Temporary 1. Put both circuit switches to the OFF position (Pumpdown and Stop). 2. After compressors have stopped, put System Switch (S1) to OFF (emergency stop). 3. Turn off chilled water pump or air handler if applicable. Chilled water pump to operate while compressors are pumping down. To start the chiller after a temporary shutdown, follow the start-up instructions. Extended 1. Front seat both condenser liquid line service valves. 2.
Electrical Check Out CAUTION Electrical power must be applied to the compressor crankcase heaters 24 hours before starting unit to drive off refrigerant from the oil or compressor damage can occur. 1. Open all electrical disconnects and check all power wiring connections. Start at the power block and check all connections through all components to and including the compressor terminals. These should be checked again after 3 months of operation and at least annually thereafter. 2.
VFD Low Ambient Control (Optional) The optional VFD fan control is used for unit operation below 35°F (2°C) down to a minimum of 0°F (-17°C). The control looks at the saturated discharge temperature and varies the fan speed to hold the temperature (pressure) at the “target” temperature. This temperature is established as an input to a setpoint screen labeled “Sat Condenser Temp Target”.
The power element is removable from the valve body without removing the valve from the line. NOTE: Before adjusting superheat, check that unit charge is correct and liquid line sight glass is full with no bubbles and that the circuit is operating under stable, full load conditions. The suction superheat for the suction leaving the evaporator is set at the factory for 8 to 12 degrees F at full load.
Unit Maintenance General On initial start-up and periodically during operation, it will be necessary to perform certain routine service checks. Among these are checking the liquid line sight glasses, taking condensing and suction pressure readings, and checking to see that the unit has normal superheat and subcooling readings. A recommended maintenance schedule is located at the end of this section. Compressor Maintenance The scroll compressors are fully hermetic and require no maintenance.
checked at full load with at least 70°F (21.1°C) outdoor air temperature, stable conditions, and all fans running. An element inside the sight glass indicates the moisture condition corresponding to a given element color. If the sight glass does not indicate a dry condition after about 12 hours of operation, the circuit should be pumped down and the filter-drier changed; or verify system condition by performing an acid test on the compressor oil.
Service CAUTION Service on this equipment is to be performed by qualified refrigeration personnel familiar with equipment operation, maintenance, correct servicing procedures, and the safety hazards inherent in this work. Causes for repeated tripping of equipment protection controls must be investigated and corrected. Disconnect all power before doing any service inside the unit.
Remote Evaporator (AGZ-BM Only) The evaporator is the direct expansion, shell-and-tube type with refrigerant flowing through the tubes and water flowing through the shell over the tubes. The tubes are internally finned to provide extended surface as well as turbulent flow of refrigeration through the tubes. Models AGZ 070BM or smaller have a stainless steel brazed-plate type evaporator. Other than cleaning and testing, no service work should be required on the evaporator.
5. Check the unit subcooling value by reading the liquid line pressure and temperature at the liquid line near the filter-drier. The subcooling values should be between 15 and 20 degrees F (8.3 and 11.1 degrees C). 6. With outdoor temperatures above 60°F (15.6°C) all condenser fans should be operating and the liquid line temperature should be within 5°F-10°F (2.8°C-5.6°C) of the outdoor air temperature. At 25-50% load the liquid line temperature should be within 5°F (2.
ACZ/AGZ Troubleshooting Chart PROBLEM Compressor Will Not Run Compressor Noisy Or Vibrating High Discharge Pressure Low Discharge Pressure High Suction Pressure Low Suction Pressure Compressor Will Not Stage Up Compressor Staging Intervals Too Short Compressor Oil Level Too High Or Too Low Compressor Loses Oil Motor Overload Relays Or Circuit Breakers Open Compressor Thermal Protection Switch Open IOMM ACZ/AGZ-3 1. 2. POSSIBLE CAUSES Main Switch. Fuse Blown. Circuit breakers open 1. 2. 3.
Notes 134 ACZ / AGZ-BM IOMM ACZ/AGZ-3
IOMM ACZ/AGZ-3 ACZ / AGZ-BM 135
ACZ / AGZ-BM IOMM ACZ/AGZ-3
This document contains the most current product information as of this printing. For the most up-todate product information, please go to www.mcquay.com. Post Office 2510, Staunton, Virginia 24402 USA • (800) 432-1342 • www.mcquay.
