Installation & Maintenance Data IM 1060-3 Group: WSHP Part Number: 669479203 Date: May 2012 Enfinity™ Large Horizontal Water Source Heat Pumps with R-410A Refrigerant Horizontal Models CCH Standard Range & CCW Geothermal Range Unit Sizes 072 – 120 (6 to 10 Tons) • R-410A Refrigerant ©2012 McQuay International • 800.432.1342 • www.daikinmcquay.
Contents Nomenclature.......................................................................2 Antifreeze Correction Factors...........................................12 ...............................................................................................2 MicroTech® III Controller....................................................13 Receiving and Storage.........................................................3 Pre-Installation..................................................................
Receiving and Storage CAUTION Sharp edges can cause personal injury. Avoid contact with them. Use care and wear protective clothing, safety glasses and gloves when handling parts and servicing heat pumps. 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.
Pre-Installation Air Discharge Conversion Procedure Unit sizes 072 thru 120 straight discharge unit may be converted to an end discharge by doing the following: Note: No additional parts are required to perform this rework. The rework must not be performed while unit is in the ceiling, but on the floor or a work bench. Estimated Time: 1 Hour CAUTION Sharp edges can cause personal injury. Avoid contact with them.
Installation Unit Location 1. Locate the unit in an area that allows for easy removal of the filter and access panels. Leave a minimum of 18" of clearance around the heat pump for easy removal, and to perform routine maintenance, or troubleshooting. 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.
Table 1: 60 Hz Unit - Sheave Adjustment Installation Air Balancing Unit sizes 072 thru 120 are supplied with a variable pitch motor sheave to aid in airflow adjustment. They are set at the factory as shown in Table 1. 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.
Table 2: 50 Hz Unit - Sheave Adjustment Unit Size Motor HP RPM Range 072 1½ 756-901 096 1½ 720-860 120 3 756-902 Factory Settings (RPM) 786 858 815 Motor Sheave Position 4-Turns Open 1½-Turns Open 3-Turns Open Ductwork & Attenuation Table 3: Filter Rack/Return Air Duct Collar Dimensions Unit Size 072 A 45.12" (1146mm) B 26.53" (674mm) C 3.20" (81mm) D 1.82" (46mm) E 1.50" (38mm) 096 55.12" (1400mm) 26.53" (674mm) 3.20" (81mm) 1.82" (46mm) 1.50" (38mm) 120 55.12" (1400mm) 26.
Figure 8: Suggested Return Ducting per ASHRAE and SMACNA Publications Two 90° Turns Prior to the Intake (Ductwork Sized Based on Airflow) Flexible Connector Acoustic/Thermal Lining Acoustic/Thermal Lining Ductwork Supported Independent of Unit Acoustic/Thermal Lining 10ft. (3 meters) Return Air Intake Located Away from the Unit Blower Flexible Connector Ventilation Air Ventilation may require outside air.
Piping 1. All units should be connected to supply and return piping in a two-pipe reverse return configuration. A reverse return system is inherently self-balancing and requires only trim balancing where multiple quantities of units with different flow and pressure drop characteristics exist in the same loop. Check for proper water balance by measuring differential temperature reading across the water connections.
Cleaning & Flushing System 1. Prior to first operation of any conditioner, the water circulating system must be cleaned and flushed of all construction dirt and debris. If the conditioners are equipped with water shutoff valves, either electric or pressure operated, the supply and return runouts must be connected together at each conditioner location. This will prevent the introduction of dirt into the unit. See Figure 11.
5. Set thermostat to “Heat.” If the thermostat is the automatic changeover type, set system switch to the “Auto” position and depress the heat setting to the warmest selection. Some conditioners have built-in time delays which prevent the compressor from immediately starting. With most control schemes, the fan will start immediately. After a few minutes of compressor operation, check for warm air delivery at discharge grille.
Additional Information For Initial Start-up Standard Range units CCH Units are designed to start-up in an ambient of 50°F (10°C), with entering air at 50°F (10°C), with entering water at 70°F (21°C), with both air and water flow rates used in the ISO 13256-1 rating test, for initial start-up in winter. Note: This is not a normal or continuous operating condition. It is assumed that such a start-up is for the purpose of bringing the building space up to occupancy temperature.
MicroTech® III Controller The control enclosure houses the major operating electrical controls including the MicroTech® III controller and I/O expansion module, control transformer, compressor relays and fan relay. Each component is easily accessed for service or replacement.
The MicroTech III Controller is a microprocessor-based control board conveniently located in the unit control box for easy access through a removable access panel. The standalone unit controller is a hard wired interface and provides all the necessary field connections. The board can be wired for 24volt AC output to the wall thermostat by using terminals R & C. An LED annunciator is located on the front of the unit chassis to allow quick check of the unit operating status.
I/O Expansion Module Figure 13: I/O Expansion Module Configuration Jumper Terminals Jumper Terminals The I/O Expansion Module is factory-installed for control of the second refrigeration circuit. The I/O Expansion Module has an independent LED annunciator to identify operational fault conditions for the second refrigeration circuit. JP1 shorted in units with 2 compressors JP1 through JP8 not used with 2 circuit units.
MicroTech® III Controller with LonWorks® or BACnet Communication Module Each Enfinity Large Horizontal Water Source Heat Pump can be equipped with a LonWorks or BACnet communication module. The LonWorks module is LonMark 3.4 certified and designed to communicate over a LonWorks communications network to a Building Automation System (BAS). The BACnet module is designed to communicate over a BACnet MS/ TP communications network to a building automation system.
Table 7: MicroTech® III Controller Terminals Locations and Descriptions H1 - 1 24 24 VAC Power Input H7 - 6 Red-Green-Yellow LED Common H1 - 2 C 24 VAC Common H8 - 1 1 Isolation Valve/Pump Request Relay N/O H2 - 1 SL1 Fan Output - Switched L1 H8 - 2 Isolation Valve/Pump Request Relay N/C Blank Terminal H8 - 3 24 VAC Common Return Air Temperature Signal H2 - 2 H2 - 3 N Fan Neutral H9 - 1 H3 - 1 HP1-1 High Pressure Switch 1 Input Terminal 1 H9 - 2 1 Return Air Temperature
Note: A random start delay time between 180 and 240 seconds is generated at power up. Figure 15: Location of configuration jumpers on the MicroTech III unit controller Figure 14: MicroTech III unit controller terminal locations The IV/PR(H8) terminals of the MicroTech III unit controller are used for motorized valve / pump restart. This terminal passes a voltage signal whenever the unit compressor is turned on. This signal is detected by a pump restart relay providing a N.O. or N.C.
Figure 16: LonWorks® Communication Module Placement on MicroTech® III Controller IM 1060-3 / Page 19 of 32
Typical Wiring Diagram Figure 17: MicroTech® III Controller with I/O Expansion Module & Communication Module 208/230, 460, 575-60-3 (1.5 hp only) Drawing No.
Typical Wiring Diagrams Figure 18: MicroTech® III Controller with I/O Expansion Module & Communication Module – 208/230, 460, 575-60-3 (greater than 1.5 hp) MicroTech III Control Board JP1 Open (Normal) Shorted (Test Mode) Shorted JP2 Open (Std Range) JP3 Shorted (Geothermal Range) Spare JP4 Open JP5 Open JP6 Spare JP7 Spare JP8 Drawing No.
Thermostat Connections Figure 19: 7-Day Programmable Electronic Thermostat (P/N 668375301) MicroTech III Unit Control Board Low Voltage Terminal Strip (Circuit 1) TB2 Thermostat Terminals 24VAC Common C Tenant Override O - Fan G + Cool 1 Y1 Cool 2 Y2 Heat 1 W1 Heat 2 W2 Alarm Output A 24VAC R C R ■ Wire 1 should run between the S1 terminal on the thermostat and the S1 terminal on the remote sensor ■ Wire 2 should run between the S2 terminal on the thermostat and the S2 terminal on th
Figure 23: MicroTech® III Wall Sensor Details Figure 25: Temperature Sensor Wiring to MicroTech III Unit Controller (669529001) 0 to 10 K ohm Potentiometer Temperature Sensor Terminals 4.
Figure 28: 2-Way Motorized Valve Wiring to MicroTech III Controller Page 24 of 32 / IM 1060-3 Figure 29: 2-Way Motorized Valve Wiring Details
Motorized Valve/Pump Restart Output Figure 31: Multiple Unit Control Panel and Board The MicroTech III controller output, IV/PR (H8) is used to energize a motorized valve actuator or start a water pump, to allow 100% water flow through the unit prior to starting the compressor. See Figure 28 on page 24 for wiring termination details. The output voltage is 24 VAC. A separate 24 VAC relay may be required between the control board and the controller device depending on power requirements.
Troubleshooting The in and outs of R-410A R-410A is a non-ozone depleting blend of two refrigerants - HFC-125 and HFC-32 in a fifty percent mixture. R-410A exhibits higher operating pressure and refrigeration capacity than R-22. R-410A is intended for use in new air conditioning applications that have traditionally been used HCFC-22 (R22). Due to higher capacity and pressure of R-410A, it must not be used in existing R-22 systems.
Figure 32: Troubleshooting Refrigeration Circuit Air Water Head Suction Compressor Super Temp (loops) Temp Subcooling Pressure Pressure Amp Draw Heat Symptom Differential Differential Charge Undercharge System (Possible Leak) Low Low Low High Overcharge System High High High Normal Low Air Flow Heating High High Low Air Flow Cooling Low Low Low Low Low Water Flow Heating Normal Normal Low Low Low Low Pressure Normal High Pressure High Low High Pressure High Low Low T
Typical Cooling Refrigeration Cycle – Dual Compressors Note: Typical temperature readings are at full load conditions at ISO-13256 for boiler-tower applications. When the wall thermostat calls for COOLING, the reversing valve (de-energized) directs the flow of the refrigerant, a hot gas, from the compressor to the water-to-refrigerant heat exchanger (coaxial heat exchanger). There, the heat is removed by the water, and the hot gas condenses to become a liquid.
Typical Heating Refrigeration Cycle – Dual Compressors Note: Typical temperature readings are at full load conditions at ISO-13256 for boiler-tower applications. When the wall thermostat calls for HEATING, the reversing valve (energized) directs the flow of the refrigerant, a hot gas, from the compressor to the air-to-refrigerant heat exchanger coil (condenser). There, the heat is removed by the air passing over the surfaces of the coil and the hot gas condenses and becomes a liquid.
Troubleshooting the Water Source Heat Pump Unit Figure 35: Troubleshooting Guide - Unit Operation Low voltage, check power supply voltage Fuse may be blown, circuit breaker is open Wire may be loose or broken.
DANGER To avoid electrical shock, personal injury or death, be sure that field wiring complies with local and national fire, safety, and electrical codes, and voltage to the system is within the limits shown in the job-specific drawings and unit electrical data plate(s). Power supply to unit must be disconnected when making field connections. To avoid electrical shock, personal injury or death, be sure to rigorously adhere to field wiring procedures regarding proper lockout and tagout of components.
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