Installation & Maintenance Data IM 1059-1 Group: WSHP Part Number: 910109005 Date: April 2010 Enfinity™ Large Vertical Water Source Heat Pumps with R-410A Refrigerant Vertical Models LVC Standard Range & LVW Geothermal Range Unit Sizes 072 – 290 (6 to 25 Tons) • R-410A Refrigerant ® ©2010 McQuay International
Table of Contents Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Vertical Unit LVC-LVW . . . . . . . . . . . . . . . . . . . . . . 2 Typical Wiring Diagrams . . . . . . . . . . . . . . . . . . . 21-23 MicroTech® III Controller with I/O Expansion Module & Communication Module 208/230, 460, 575-60-3 Unit Sizes 096-120 . . . . .
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.
Unit Location Large Vertical Water Source Heat Pump units are easily located in equipment rooms or floor-by-floor installations. They can be applied to all building types where it is advantageous to extend the water source heat pump concept to larger or core areas. Locate the unit in an area that allows for easy removal of the filter and access panels, and has enough space for service personnel to perform maintenance or repair. Provide sufficient room to make water, electrical and duct connections.
Vibration Isolators Figure 3: Vibration Isolator Dimensions For minimum sound and vibration transmission, it is recommended that the unit be mounted on vibration isolators. Holes are provided in the bottom panel to facilitate connection of isolators (see Figures 4-5 for hole locations). Isolators supplied by the manufacturer are the type shown in Figures 3. Four white isolators are used for single compressor units and six green isolators are used for dual compressor units.
Air Balancing Unit sizes 072 thru 290 are supplied with a variable pitch motor sheave to aid in airflow adjustment. They are typically set at the low end of the rpm range for field adjustment to the required airflow. 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.
For minimum noise transmission, the metal duct material should be internally lined with acoustic fibrous insulation. The ductwork should be laid out so that there is no line of sight between the conditioner discharge and the distribution diffusers. Return air ducts can be brought in adjacent to the return air of the conditioner. Typically, the equipment room becomes the common return air plenum.
Optional 2" Filter Rack & Return Air Duct Collar The optional 2" filter rack and duct collar accepts 2" (51 mm) thick filters for side removal. It replaces the existing 1" (25 mm) filter rack and duct collar. The optional 2" return air duct collar kit is used to facilitate connection of return air duct to the unit. A duct collar kit can be used in conjunction with the standard 1" thick filter rack or the optional 2" filter rack. The kits are installed as follows: 1.
Figure 12: Optional Return Air Duct Collar & 2" Filter Rack Components – Sizes 072-120 Top Duct Collar Center Support Top Filter Rack Chassis Side Flanges Center Filter Racks Door End Duct Collar Side Figure 13: Optional Return Air Duct Collar & 2" Filter Rack Components – Sizes 180-290 Top Duct Collar Center Supports Top Filter Rack Chassis Center Filter Racks Duct Collar Center Support Door End Duct Collar Side IM 1059-1 / Page of 36
Piping CAUTION Do not overtorque fittings. The maximum torque without damage to fittings is 30 foot pounds. If a torque wrench is not available, use as a rule of thumb, finger-tight plus one quarter turn. Use two wrenches to tighten the union, one to hold the line and one for simultaneous tightening of the nut. 1. All units should be connected to supply and return piping in a two-pipe reverse return configuration.
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 15.
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).
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 1-1⁄8" (29 mm) knockout is supplied on the side of the unit. A disconnect switch near the unit is required by code.
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 17: 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.
MicroTech® III Controller with LonWorks® or BACnet Communication Module Each Enfinity Large Vertical 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 H7 - 6 Red-Green-Yellow LED Common 24 VAC Common H8 - 1 1 Isolation Valve/Pump Request Relay N/O Fan Output - Switched L1 H8 - 2 Isolation Valve/Pump Request Relay N/C H2 - 2 Blank Terminal H8 - 3 24 VAC Common H2 - 3 Fan Neutral H9 - 1 Return Air Temperature Signal H1 - 1 24 24 VAC Power Input H1 - 2 C H2 - 1 SL1 N 1 H3 - 1 HP1-1 High Pressure Switch 1 Input Terminal 1 H9 - 2 Return Air Temperat
Note: A random start delay time between 180 and 240 seconds is generated at power up.
Figure 20: LonWorks® Communication Module Placement on MicroTech® III Controller Page 20 of 36 / IM 1059-1
Typical Wiring Diagram Figure 21: MicroTech® III Controller with I/O Expansion Module & Communication Module 208/230, 460, 575-60-3 (1.5 hp or less) Drawing No.
Typical Wiring Diagrams Figure 22: 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.
Typical Wiring Diagram Figure 23: MicroTech® III Controller with I/O Expansion Module & Communication Module 208/230, 460, 575-60-3 – Unit Size 290 Drawing No.
Thermostat Connections Figure 24: 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 + Y1 Cool 2 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 1 4. Install two strand shielded wire between remote sensor and thermostat. Shielded wire must be used.
Figure 28: MicroTech® III Wall Sensor Details . 0 to 10 K ohm Potentiometer Figure 30: Temperature Sensor Wiring to MicroTech III Unit Controller (669529001) Temperature Sensor Terminals 4.
Figure 33: 2-Way Motorized Valve Wiring to MicroTech III Controller Page 26 of 36 / IM 1059-1 Figure 34: 2-Way Motorized Valve Wiring Details
Motorized Valve/Pump Restart Output Figure 36: 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 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 (R22). 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 High High Normal Low Low Normal Low Low Normal High Low Safety Lock Out Low Low Pres
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 39: 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 40: 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.
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