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In-series Gas Boosting

Temperature controllers must not be fitted if this water heater is installed

as part of a solar water heater system because water at a temperature

much higher than the controller setting can be delivered.

If a solar pre-heater has been installed to an existing Integrity water heater

installation then a solar bypass valve or a comparator must be fitted at this

water heater and any controllers, if fitted, must be disconnected and

removed. Note: models 871024-C and 871026-B do not require a solar

bypass valve or a comparator.

18 litre Integrity’s are NOT suitable for use as in series gas booster.

871020-B, 871024-C and 871026-B Models

Where one of the above listed model Integrity is installed to provide in-series gas boosting

a solar bypass valve or a comparator is not required. These models have had a change

made to the operating software which eliminates the need for either of these components.

The software now electronically mimics a bypass valve so that when the inlet water

temperature is above 58°C the fan and burner will not operate despite water flowing

through the heat exchanger. When the inlet water temperature is less than or equal to

58°C the burner will fire and boost the outlet temperature to 60°C provided the flow rate is

greater than 3 litres per minute. 20 and 26 models with modified software can be identified

by a B suffix in the model number, whereas a 24 model with modified software can be

identified by a C suffix in the model number i.e. 871024NF-C.

The preset outlet temperature of the Integrity, when installed as an in-series gas booster to

a solar water heater, must be set at 60 C for the system to operate correctly.

The factory preset outlet temperature of all Integrity models is 55 C; during a new

installation it will be necessary to reset the outlet temperature to 60 C. Refer to page 4 for

details on checking and adjusting the outlet temperature.

Note: If a 20, 24, 24B or 26 model heater is replaced with an 20B, 24C or 26B model

heater and the existing 20, 24, 24B or 26 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).

In-series Gas Boosting Integrity Solar Loline Installation

Note: This plumbing diagram is

also applicable to standard

model heaters fitted with a

comparator.

For more information on

comparators refer to page 17.

Rheem 871018 User Manual

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