Bard GVDM-26 manual Heat Pump Heating Mode, Water Supply Systems

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2.The compressor, which is a sealed pump that moves the refrigerant through the system.

3.The water coil where the heat that was absorbed from the indoor space is discharged to the circulating water supply. A pump is required somewhere in the system to move the water through the heat pump water coil.

HEAT PUMP (HEATING MODE)

The system operates in reverse cycle, meaning that it acquires and moves heat from the water supply flowing through the water to refrigerant coil, and transfers it indoors to be rejected into the circulating air stream.

Most water-to-air heat pumps will also be equipped with some amount of electric heat to supplement the heating capacity of the compressor system on an as needed basis. This operation is entirely automatic and is controlled by the indoor thermostat.

Because of the design of water-to-air heat pumps and the water temperatures involved, no defrost system is required as in air-to-air heat pumps.

WATER SUPPLY SYSTEMS

Depending upon type and application of the water-to-air heat pump, the water-side of the system could be one of the following:

1.Individual closed loop buried in a trench or vertical bore hole(s).

2.Individual loop submerged in a pond.

3.Water supplied from a well and discharged into pond, stream, ditch or another well.

4.Water supplied from a boiler/tower system, typically only in larger multi-unit installations.

A properly sized heat pump cannot cool a structure off rapidly, and instead will pull down the temperature slowly. It also will remove a certain amount of moisture (humidity) from the circulating air stream in the process. It may take several hours to pull down a hot, moist building or structure on initial start up, or anytime the system has been turned off for a long period of time. It is generally best to set the thermostat at a comfortable temperature and let it control the system as needed, rather than turning it on and off.

Moisture (humidity) removal with a conventional air conditioner (cooling) unit, or heat pump when operating in the cooling mode, is not directly controlled and is a by-product of the unit operating to control temperature in response to the temperature (thermostat) control device. Over-sized equipment can easily control temperature but will have short run-times, thus reducing its ability to remove moisture from the circulating air stream. There are also many additional influences that can affect humidity levels within the conditioned space such as laundry appliances, cooking, showers, exhaust fans, and any other items that can generate moisture or affect its removal from the space. Therefore, while operation of the air conditioning or heat pump system in the cooling mode will remove some amount of moisture as it reduces the air temperature, precise humidity regulation in the conditioned space cannot be assured and additional equipment such as a dedicated dehumidifier may be required.

Manual

2100-520

Page

4 of 7

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Contents USER’S Guide Table of Contents Cooling Mode General InformationBasic Operating Principles AIR FiltersHeat Pump Heating Mode Water Supply SystemsAutomatic Control Systems Insufficient Cooling or HeatingFailure to Operate Lubrication RequirementsPeriodic Maintenance Helpful Hints Good Operating PracticesManual 2100-520
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GVDM-26 specifications

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