Installation & Maintenance Data IM 1060 Group: WSHP Part Number: 910105457 Date: January 2010 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 ® ©2010 McQuay International
Table of Contents Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Horizontal Ceiling Unit CCH-CCW . . . . . . . . . . . . . 2 MicroTech III Controller Terminal Locations & Descriptions . . . . . . . . . . . . . . . . . . . 17 MicroTech III Controller Diagram . . . . . . . . . . . . . 18 LonWorks Communication Module Placement on MicroTech III Controller Diagram . . . . . . . . . . . . .
Receiving and Storage CAUTION Sharp edges can cause personal injury. Avoid contact with them. 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.
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. 1. Remove the top (A) and the end access panel (B) 2.
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.
Installation Table 1: 60 Hz Unit - Sheave Adjustment 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 Factory Settings (RPM) 786 858 815 Unit Size Motor HP RPM Range 072 1½ 756-901 096 1½ 720-860 120 3 756-902 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 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.
Again, many conditioners have time delays which protect the compressor(s) against short cycling. After a few minutes of operation, check the discharge grilles for cool air delivery. Measure the temperature difference between entering and leaving water. It should be approximately 1½ times greater than the heating mode temperature difference. For example, if the cooling temperature difference is 15°F (8°C), the heating temperature difference should have been 10°F (5°C).
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 24-volt 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.
Figure 13: I/O Expansion Module Configuration Jumper Terminals I/O Expansion Module 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. Jumper Terminals 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 15: MicroTech® III Controller Terminals Locations and Descriptions 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 H2 - 2 Blank Terminal H8 - 3 24 VAC Common H2 - 3 N Fan Neutral H9 - 1 Return Air Temperature Signal H3 - 1 HP1-1 High Pressure Switch 1 Input Terminal 1 H9 - 2 Return Air Temperature Common
Note: A random start delay time between 180 and 240 seconds is generated at power up.
Figure 16: LonWorks® Communication Module Placement on MicroTech® III Controller IM 1060 / 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 Unit Sizes 096-120 Drawing No.
Typical Wiring Diagrams Figure 18: MicroTech® III Controller with I/O Expansion Module & Communication Module 208/230, 460, 575-60-3 – 1.5 HP Motor JP4 JP5 JP6 JP7 JP8 JP1 JP2 JP3 JP4 JP5 JP6 JP7 JP8 Shorted Open Open Open Open Open Spare Spare JP3 Drawing No.
Typical Wiring Diagram Figure 19: MicroTech® III Controller with I/O Expansion Module & Communication Module 208/230, 460, 575-60-3 – Unit Size 290 Drawing No.
Thermostat Connections Figure 20: 7-Day Programmable Electronic Thermostat (P/N 668375301) MicroTech III Unit Control Board Low Voltage Terminal Strip (Circuit 1) TB2 Thermostat Terminals C Tenant Override O - Fan G + Cool 1 Y1 Y2 Heat 1 W1 Heat 2 W2 Alarm Output A 24VAC R Do not run remote sensor wire in conduit with other wires. • 24VAC Common Cool 2 4. Install two strand shielded wire between remote sensor and thermostat. Shielded wire must be used.
Figure 24: MicroTech® III Wall Sensor Details . 0 to 10 K ohm Potentiometer Figure 26: Temperature Sensor Wiring to MicroTech III Controller (669088101) Temperature Sensor Terminals 4.
Figure 29: 2-Way Motorized Valve Wiring to MicroTech® III Controller Figure 30: 2-Way Motorized Valve Wiring Details IM 1060 / Page 25 of 32
Motorized Valve/Pump Restart Output Figure 32: Multiple Unit Control Panel and Board The MicroTech III 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 21, page 21 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 (R-22). Due to higher capacity and pressure of R-410A, it must not be used in existing R-22 systems.
Table 17: 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 Normal High Low Safety Lock Out Low Low Pressure Normal High Pressure High Hig
Typical Cooling and Heating Refrigeration Cycles – Dual Compressors Note: Typical temperature readings are at full load conditions at ISO-13256 for boiler-tower applications. Figure 33: Cooling Refrigeration Cycle 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).
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.
Troubleshooting the MicroTech® III Controller Figure 36: MicroTech III Unit Controller LED Status and Faults Troubleshooting Reference 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.
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.
