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Rinnai 7 EHPA Heat Pump OIM
OPERATION PRINCIPLE
The operation of an electric heat pump is very similar to a refrigerator, but in reverse. A heat pump operates by
transferring heat from the ambient outside air into the water. Electricity is just used to operate the system, but not
to directly heat the water. Because of this energy consumption is signicantly reduced as compared to an electric
element hot water system. The warmer the climate in which the heat pump is installed, the more efcient the heat
pump system will be at heating water.
The heat pump unit includes a circulation pump which draws water from the bottom of the storage tank and returns
it to the tank at a higher temperature. A temperature sensor in the tank is used to control the heat pump operation
to achieve suitable tank temperatures.
During the occasional times when the ambient weather conditions aren’t suitable for the heat pump to operate, the
electric element will provide heating to ensure a supply of hot water.
6 5
11
7
3
2
8
1
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4
10
1. Cold water inlet pipe
2. Circulation Pump
3. Plate Heat Exchanger
4. Hot Water from Heat Exchanger to the Tank
5. Discharge Ambient Air
6. Outlet Air
7. Fan Coil Unit
8. Compressor
9. Heating Element
10. Water Temperature Sensor
11. PTR Valve
WARNINGS AND IMPORTANT INFORMATION
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