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Explains symbols used in the document to alert readers to potential hazards.
Emphasizes that only qualified personnel should perform installation and service of the equipment.
Details thermostat installation and wiring requirements for heating and cooling modes.
Warns about potential damage if the freeze protection set point is modified without adequate measures.
Describes how the unit operates in cooling and heating modes, with heating priority.
Explains how to set the fan switch for continuous blower operation or auto mode.
Details how the high-pressure switch operates and causes compressor lock-out.
Describes the monitoring and lockout function of the low-pressure limit switch.
Explains the freezestat's role in preventing low-temperature operation and potential lockouts.
Details the function and lockout mechanism of the condensate overflow switch.
Explains the random start function for compressors upon power up, including time delays.
Describes internal compressor protection and features like anti-short cycle delay (ASCD).
Describes how to display the last five flash codes on the board's LED for troubleshooting.
Explains how to bypass ASCD for one cycle or reset active lockouts by pressing the button.
Details how to set the network address for units to be networked with other units.
Provides guidance on supply and return piping, including hose use and insulation.
Warns against exceeding recommended water flow rates to prevent heat exchanger damage.
Emphasizes locking off power supply switches before installing or operating the unit to prevent shock.
Lists essential checks to perform before energizing the unit's power supply.
States the manufacturer does not provide a warranty of fitness as they cannot control usage conditions.
The document describes the Model RSH/RSV Series R-410A Water Source Heat Pumps, which are self-contained heating and air conditioning units designed for indoor installation. These units utilize a water-to-refrigerant heat exchanger to either extract heat (heating cycle) or reject heat (cooling cycle) from/to a circulating water loop.
The RSH/RSV units are designed to provide both heating and cooling for indoor spaces. They operate by transferring heat between the refrigerant circuit and a circulating water loop. In cooling mode, the unit extracts heat from the indoor air and rejects it to the water loop. In heating mode, it extracts heat from the water loop and transfers it to the indoor air. All models, ranging from 1/2 to 6 tons, are factory-charged and pre-piped. Horizontal (RSH) units are designed for suspended ceiling mounting with integral hanger channels, while Vertical (RSV) units are designed for free-standing floor mounting. Water supply, water outlet, and condensate drain connections are made via female threaded pipe fittings.
Each refrigeration circuit includes an adjustable bi-flow expansion valve, a liquid line filter drier, and multiple service gauge ports for maintenance. External high-pressure and low-pressure protection switches are integrated into each compressor circuit to ensure safe operation. A standard suction line freezestat protects against low evaporator temperatures, which can occur with low water supply temperatures. This freezestat protection can be disabled for low water temperature applications with adequate antifreeze solutions. Heat Pump models are equipped with a pilot-operated, sliding piston type, 4-way reversing valve with a replaceable magnetic solenoid coil, which is energized only in the cooling mode.
The coaxial water-to-refrigerant heat exchanger and all internal water piping are rated for water side working pressures up to 400 psig. The units are fully factory-wired with all necessary operating controls, including a standard microprocessor control. A 24-volt control circuit with an oversized transformer is provided for field connections, allowing the units to operate with conventional thermostat control interfaces.
The units are controlled by a microprocessor board specifically designed for water source heat pump operation, which interfaces with a conventional thermostat. The control system includes a self-contained low-voltage control circuit and a lockout circuit with reset capability at the space thermostat or base unit. This lockout circuit activates if any standard safety devices trip, such as loss-of-charge/low-pressure switch, high-pressure switch, freeze-protection thermostat (indicating low water temperature shutdown), or condensate overflow protection switch.
The unit operates with conventional thermostat designs, utilizing "W" and "Y" terminals for activating heating or cooling modes. Wiring between the thermostat and the unit should be 18 Ga. minimum. The control board features on-board diagnostics and a fault code display, and it monitors each refrigerant safety switch independently. It also includes a random start feature and retains the last five fault codes in non-volatile memory, ensuring data is not lost during power outages.
For cooling, the room thermostat energizes the low-voltage circuit between “R” and “Y1”. The microprocessor control determines if the operation is available and energizes the compressor and fan. The indoor blower has a minimum run time of 30 seconds and a 10-second delay between operations. For heating, the thermostat energizes the circuit between “R” and “W1”, and the microprocessor control energizes the compressor and fan. Heating takes priority if both heating and cooling calls are present.
A continuous blower operation can be activated by setting the room thermostat fan switch to "ON". In "AUTO" or "HEAT" settings, the blower is energized only during cooling or heating operations, after a specified delay. The compressor is protected by an anti-short cycle delay (ASCD) to prevent short cycling and a minimum run time when energized. Internal protection also shuts down the compressor in case of abnormal temperature rise.
The coaxial freeze protection set point is factory-set to lock out the compressor if the water supply temperature drops below 35°F. This set point can be lowered for low-temperature heating applications with antifreeze by removing a jumper at P6 on the microprocessor control board. However, this modification should only be done with adequate antifreeze to prevent damage.
The air circulating fan motor bearings are factory-lubricated and sealed for life, requiring no further lubrication. The compressor is part of a sealed refrigeration system and does not require additional lubrication.
Filter changes are essential for maintaining performance. Filters should be checked at 60-day intervals for the first year of operation, and replaced if light cannot be seen through them. Only 1-inch thick disposable fiberglass filters of the same size should be used.
The condensate drain pan should be checked annually, cleaned, and flushed as required. For horizontal units, a P-trap MUST be used in the 3/4 FPT drain line, which is not internally trapped, as the cooling coil compartment and drain pan are under negative pressure when the blower is running. The drain line should be sloped (1/4 inch/foot) to an open drain, and each unit should have its own individual trap with means to flush it. Vertical units include a flexible hose inside the cabinet as a trapping loop, so an external P-trap is not necessary.
Regular recording of reference operating parameters (volts, amp draw, water temperature differences) is recommended. Comparing this data with start-up and annual data helps indicate the general equipment condition. Periodic compressor lockouts are often caused by air or water problems, indicating insufficient heat transfer. Troubleshooting should involve checking for dirt in the water system, insufficient water flow rates, excessive water temperatures, and dirty air filters.
The microprocessor control unit provides flash codes to aid in troubleshooting. These codes are distinguished by short on and off cycles, while normal operation is indicated by a "heart beat" flash (1 second on, 1 second off). Buttons on the control board allow viewing the last five error codes, resetting active lockouts and bypassing ASCD for one cycle, and setting the network address for networked units.
General| HSPF | Up to 10 |
|---|---|
| Refrigerant | R-410A |
| Voltage | 208/230V |
| Cooling Capacity | 24, 000-60, 000 BTU/H |
| Heating Capacity | 24, 000-60, 000 BTU/H |
| Warranty | 10-Year Limited Warranty on compressor and parts |
