Rheem 325 II Series Service Instructions Manual page 30

Proxy Tank Sensor
In order to conduct a full functional test, the heat pump must be
operated in heating mode. As a heating cycle may not be
required due to the water in the storage tank being fully heated,
the heat pump will not ordinarily operate in heating mode. Use
of the Proxy Tank Sensor will allow the heat pump to be
operated in heating mode irrespective of the temperature of the
water in the storage tank.
The Proxy Tank Sensor is plugged into the heat pump module‟s
controller, in place of the normal tank sensor – see the diagram
on page 11.
Before using the Proxy Tank Sensor, isolate power to the water heater. Remove
the tank sensor from the bottom of the heat pump module‟s controller, and plug in
the Proxy Tank Sensor instead.
The heat pump module can now be operated.
The Proxy Tank Sensor may need to be used in conjunction with the Heat Pump Service
Power Cable if timed (off peak) power is unavailable.
Note: The Proxy Tank Sensor must not be left in place after testing or as a substitute for a
failed tank sensor, as the heat pump will not turn off.
Element Plug
In the event that a heat pump module needs to be decommissioned,
for example if the heat pump module is found to be demonstrating
the „jack hammering‟ phenomenon, the Element Plug is used to
bypass the heat pump module controller and effectively turn the
storage tank into an electric water heater. By using the Element
Plug, the service technician is able to safely ensure the home owner
still has hot water available.
If the Element Plug is used, the repairer must endeavour to rectify
the issue with the heat pump module as soon as possible in order to minimise the impact
on the home owner‟s power consumption expense.
Before using the Element Plug, isolate power to the water heater. Remove the
mains power cable from the bottom of the heat pump module‟s controller (see the
diagram on page 11), and insert the 4-pin Element Plug into the 4-pin plug on the
end of the mains cable.
The water heater can now be operated.
The Service Technician‟s Heat Pump Kit contains two Element Plugs, and Element Plugs
can be ordered as a separate part through Rheem Spare Parts, Rheem part number
056041.
TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
This document is stored and maintained electronically by Service. All printed copies are deemed uncontrolled.
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