Rheem 871018 Service Instructions Manual page 17

Paloma Solar Bypass Valve RMC Solar Bypass Valve
Inlet water from
solar water heater
Hot water outlet
Note: If a 821020, 821024, 821024-B or 821026 model heater is replaced with an 821020-
B, 821024-C or 821026-B model heater and the existing 871020, 871024, 871024-B or
871026 heater is used as an in-line booster and has a solar bypass valve fitted, the solar
bypass valve must be removed and the plumbing connections remade directly to the
Integrity inlet and outlet water connections (refer to diagrams on pages 15 & 16).
Solar Bypass Valve Operation
When the water temperature entering the solar bypass valve is above 57°C a temperature
sensitive mechanism moves the valve spindle preventing water from entering the Integrity
and allowing the water to flow through the solar bypass valve to the hot water outlet.
If the water temperature from the solar storage tank entering the solar bypass valve is
below 57°C the temperature sensitive mechanism retracts the valve allowing water to
enter the Integrity and preventing flow through the solar bypass valve. The Integrity will
boost the water temperature to 60°C at the hot water outlet provided the flow rate is
greater than 3 litres per minute.
Replacement of Solar Bypass Valve with a Comparator
An electronic device called a Comparator (part number 052127) is
now available to replace the solar bypass valve and is suitable for
use on Rheem 871020, 871024, 871024-B and 871026 models
heaters. NOTE: 20 and 26L models with a B suffix and 24L models
with a C suffix in the model number do not require either a solar
bypass valve or a comparator.
Solar bypass valves are no longer available and if faulty are to be
removed and a Comparator installed. Refer to page 18 for the
procedure on installing a comparator.
The purpose of the comparator is to interrupt the operation of the
burner when the inlet water temperature rises above 57°C.
The comparator is connected to the water flow sensor wiring and the inlet temperature
sensor (cold sensor) wiring; both these components are mounted on the water body within
the gas booster. The comparator monitors the inlet water temperature and when the
temperature rises above 57°C the comparator interrupts the signal from the flow sensor to
the PCB causing the burner to shut down.
TM031 Integrity 18, 20, 24, 26L Service Instructions REV: B
17
D.O.I: February 2008
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