Specifications

TM002 Integrity 18 & 20L Service Instructions REV: E

D.O.I: 7/11/2007

This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”

Note: If an 871020 model heater is replaced with an 871020-B model heater and the

existing 871020 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 11 & 12).

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 models heaters. NOTE: 20L models with a

-B 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 14 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.

Paloma Solar Bypass Valve RMC Solar Bypass Valve

Inlet water from

solar water heater

Hot water outlet