Installation & Maintenance Data IM 526-17 Group: WSHP Part Number: 106581303 Date: June 2006 Large Horizontal Water Source Heat Pump Units Size 070, 090, 120 Model CDD, CDE, CDL, CDS, CME, CMG, CMS ® ©2006 McQuay International
Contents Unit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-15 Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 14 Thermostat Connections . . . . . . . . . . . . . . . . . . . . . 16-17 Motorized Valve & Relay . . . . . . . . . . . . . . . . . . . . . . . . 18 Pump Restart Relay. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Boilerless System Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Field Installed Options on MicroTech Units . . .
Transportation & Storage Upon receipt of the equipment, check carton for visible damage. Make a notation on the shipper’s delivery ticket before signing. If there is any evidence of rough handling, immediately open the cartons to check for concealed damage. If any damage is found, notify the carrier within 48 hours to establish your claim and request their inspection and a report. The Warranty Claims Department should then be contacted. Do not stand or transport the machines on end.
Unit Location 1. Locate the unit in an area that allows for easy removal of the filter and access panels. Leave enough space for service personnel to perform maintenance or repair. Provide sufficient room to make water, electrical and duct connections. 2. The contractor should make sure that adequate ceiling panel access exists, including clearance for hanger brackets, duct collars and fittings at water and electrical connections. 3.
Air Balancing Unit sizes 070 thru 120 are supplied with a variable pitch motor sheave to aid in airflow adjustment. They are set at the factory according to Table 1 shown below. When the final adjustments are complete, the current draw of the motors should be checked and compared to the full load current rating of the motors. The amperage must not exceed the service factor stamped on the motor nameplate.
Ductwork & Attenuation Discharge ductwork is normally used with these conditioners. Return air ductwork may also be required. All ductwork should conform to industry standards of good practice as described in the ASHRAE Systems Guide. The discharge duct system will normally consist of a flexible connector at the unit, a transition piece to the full duct size, a short run of duct, an elbow without vanes, and a trunk duct teeing into a branch duct with discharge diffusers as shown in Figure 5.
Electrical Data General 1. Verify the compatibility between the voltage and phase of the available power and that shown on the unit serial plate. Line and low voltage wiring must comply with local codes or the National Electrical Code, whichever applies. 2. Apply correct line voltage to the unit. A 7⁄8" (22mm) hole and/or a 11⁄8" (29 mm) knockout is supplied on the side of the unit. A disconnect switch near the unit is required by code.
Union fittings in the copper lines should be applied to facilitate removal. Factory supplied condensate hose assemblies have pipe thread fittings to facilitate connection of a flexible vinyl or steel braided hose. 9. Do not locate any point in the drain system above the drain connection of any unit. Figure 7. Typical Piping 10. Automatic flow controlled devices must not be installed prior to system cleaning and flushing. 11. A high point of the piping system must be vented. 12.
5. Refill the system with clean water. Test the water using litmus paper for acidity, and treat as required to leave the water slightly alkaline (pH 7.5 to 8.5). The specified percentage of antifreeze may also be added at this time. Use commercial grade antifreeze designed for HVAC systems only. Do not use automotive grade antifreeze. Once the system has been filled with clean water and antifreeze (if used), precautions should be taken to protect the system from dirty water conditions.
Operating Limits Environment This equipment is designed for indoor installation only. Sheltered locations such as attics, garages, etc., generally will not provide sufficient protection against extremes in temperature and/or humidity, and equipment performance, reliability, and service life may be adversely affected. Air and water limits Water enthalpy Standard Units Min. Ambient Air Normal Ambient Air Max. Ambient Air Min. Ent. Air ➀ ➁ Normal Ent. Air, dw/wb Max. Ent.
Figure 10. Typical Mark IV/AC dual circuit wiring diagram Notes: 1. On 208/230V size 070, 090, and 120 units, unit is factory wired for 208V operation. If 230V power supply is used, transformer must be rewired by disconnecting the power lead from the red transformer primary wire and connecting the power lead to the orange transformer primary wire. Place an insulation cap on the red transformer primary wire. 2. All temperature and pressure switches are normally closed.
Figure 11. Typical MicroTech WSHP unit controller dual circuit wiring diagram – Size 070, 090, and 120 Gnd Lug L1 L2 L3 PB1 Ext. Overloads 3 & 5 HP only M1 22 Fan Mtr. T1 26 1 25 2 L1 23 T2 L2 24 (3 & 5 HP) 3 (1.5 HP 27 T1 T2 T3 1 2 2 3 M2 T1 Compr. T2 Mtr. 1 T3 19 T1 Compr. T2 Mtr. T3 2 8 12 9 13 T2 L2 21 T3 L3 12 13 M3 Heater (Ext. Rng. Only) 29 (50Hz only) 7 T1 L1 20 19 4 T1 L1 20 5 14 T2 L2 21 6 16 T3 L3 14 15 Heater (Ext. Rng.
Unit Operation Two types of units are available: Mark IV/AC control units or units equipped with the new MicroTech 2000 Water Source Heat Pump Controller. Mark IV/AC Control Units The Mark IV/AC circuit board is an optional control system with built-in features such as random start, compressor time delay, night setback, load shed, shutdown, condensate overflow protection, defrost cycle, brownout, and LED/fault outputs.
Mark IV/AC Sequence of Operation Read Outputs 14-Position Terminal Strip Check Timers Pin Designation 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C R V P A U L E F Y1 W1 G W2 O` Description Ye s Transformer ground (Ovac) Transformer supply (24vac) -DC power connection Pump request output Alarm fault output Unoccupied input Load shed input Remote shutdown input +DC power connection Occupied cooling mode input Occupied heating mode input Fan only input Unoccupied heating mode input Tenant override input Ye s
New MicroTech 2000 WSHP Controller Unit The MicroTech 2000 WSHP unit controller is a preprogrammed, pretested microprocessor which: ● Controls unit heating and cooling functions in response to a wall mounted comfort sensor. ● Monitors safety controls in each heat pump and responds accordingly. ● Monitors discharge air temperature and leaving water temperature at each heat pump. ● Provides fan, operation.
Thermostat Connection Diagrams Mark IV/AC Units – Unit Sizes 070-120 7-Day Programmable Electronic Thermostat (P/N 107095901) WSHP Mark IV/AC Board Low Voltage Terminal Strip (Circuit1) L U A P V R C C W1 Y1 W2 Y2 G E Includes Thermostat and Wall Plate.
Mark IV/AC Units – Unit Sizes 070-120 7-Day Programmable Electronic Thermostat – 2 Circuits (P/N 107095901) WSHP Mark IV/AC Board Low Voltage Terminal Strip (Circuit 1) L U A P V R C O W2 G W1 Y1 F E L U A P V R C C W1 Y1 W2 Y2 G E R Thermostat Terminals O W2 G W1 Y1 F WSHP Mark IV/AC Board Low Voltage Terminal Strip (Circuit 2) Includes Thermostat and Wall Plate.
Motorized Valve & Relay for Unit Sizes 070 Thru 120 Wired as shown below the motorized valve will open on a call for compressor operation. These 1-1⁄4" valves are power-open power-close. Valve and auxiliary relay are purchased separately. Note: The wiring shown below can only be used when the “P” terminal is not being used as a pump restart signal to other equipment.
Pump Restart Relay Kit P/N 061419001 will change state causing a contact closure between terminal 58 and 64 signaling the loop water control (LWC) panel to restart the loop pump if Off. Used as an option with the Mark IV/AC board, the pump restart relay kit provides a means to alert the loop water controller that water flow is required by a WSHP so that the system pump can be started. This option is typically used in installations where the pump may be shut off when there is no need for water flow (i.e.
Boilerless System Kit (BSK) – P/N 061251501 for sizes 070 - 120 The BSK field installed kits include the sheet metal enclosure with cover, wire harness, boilerless system board, auxiliary relay, and water temperature sensor. When used, one BSK is required for each unit.
Field Installed Options on MicroTech 2000 Units MicroTech 2000 units can provide up to 4-outputs, that can be configured for any of the following output control signals: 1) Scheduled Output When using a Network Master Panel (NMP) these outputs can be assigned to one of 32 available schedules. The output will energize when the assigned schedule is occupied and de-energize when in unoccupied. These outputs could be used to control lights, etc.
Troubleshooting Water Source Heat Pump Low Voltage, check power supply voltage Fuse may be blown, circuit breaker is open Wires may be loose or broken.
Maintenance 1. Normal maintenance on all conditioners is generally limited to filter changes. Sizes 070, 090 and 120 with caps should be oiled in accordance with the oil label on each heat pump. 2. Filter changes are required at regular intervals. The time period between changes will depend upon the project requirements. Some applications such as motels produce a lot of lint from carpeting and linen changes, and will require more frequent filter changes.
McQuay Training and Development Now that you have made an investment in modern, efficient McQuay equipment, its care should be a high priority. For training information on all McQuay HVAC products, please visit us at www.mcquay.com and click on training, or call 540-248-9646 and ask for the Training Department. Warranty All McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product Warranty. Consult your local McQuay Representative for warranty details.
