In-Series Gas Boosting - Rheem 871018 Service Instructions Manual

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 ending with -B do not require a solar bypass valve
or a comparator.
875 series models and 18 Litre Integrity's are not suitable for use as in-
series gas boosters.
871020-B Models
Where an 871020-B model Integrity is installed to provide in-series gas boosting a solar
bypass valve or a comparator is not required. 871020-B 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. 20L models with modified software can be identified by a
B suffix in the model number i.e. 871020NF-B.
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 50°C; during a new
installation it will be necessary to reset the outlet temperature to 60°C. Refer to page 5 for
details on checking and adjusting the outlet temperature.
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).
In-series Gas Boosting 871020-B Solar Loline Installation
Note: This plumbing diagram
is also applicable to 871020
model heaters fitted with a
comparator.
For more information on
comparators refer to page
13.
TM002 Integrity 18 & 20L Service Instructions REV: E
D.O.I: 7/11/2007
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11
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