Rinnai
8
Commercial Heat Pump OIM
OPERATION PRINCIPLE
The operation of an electric heat pump is 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 significantly reduced as compared to an electric
element hot water system.
The warmer the climate in which the heat pump is installed, the more efficient the heat pump system will be at
heating water.
The heat pump unit utilizes a circulation pump to draw 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
heat pump will activate auxiliary booster (if installed) to ensure a supply of hot water.
To meet the requirements of the National Plumbing Standard the temperature of the stored water has been set
to 65°C.
This water heater can deliver water at temperatures which can cause scalding. Check the water temperature
before use, such as when entering a shower or filling a bath or basin, to ensure it is suitable for the application and
will not cause scald injury.
We recommend and it may also be required by regulations that an approved temperature limiting device be fitted
into the hot water pipework to the bathroom and ensuite when this water heater is installed. This will reduce the
risk of scald injury and still allow hotter water to the kitchen and laundry.
WARNINGS AND IMPORTANT INFORMATION
