Heat Exchanger Care - Rheem AWW023SK JQ-1 Series Installation Maintenance And Service Manual

10. The unit casing is designed for outdoors installation and no specific maintenance should be
necessary. If the case is cleaned, ensure that power to the unit is switched off.

Care should be taken of the heat exchanger by correct approach to the hydraulic layout of the
installation and chemical treatment.

It is fundamental that the nominated flow rate of the unit be maintained and pump selection should
be made with knowledge of the target figure. Reference should be made the individual unit's
specification with current requirements shown below. As specification data may vary with product
development and/or where units are custom-manufactured, flow rates should be confirmed for
validity with Rheem Thermal at the time of installation.

If the hydraulic layout and recirculating pump capacity is seen to provide a flow well above the
specified flow litres/sec or at excess pressure, then an external by-pass should be installed or
alternatively, the pump flow should be moderated.

For seasonal shut-downs, always allow water to pass through the heater, even if the heater is not
being used. If the heater is isolated with chlorinated water or in its water piping, chlorine gases may
corrode the heat exchanger. Rheem Thermal's warranty will be voided where chemical corrosion is
clearly diagnosed as the cause of failure.

For shutdowns in locations experiencing freezing conditions, the piping system and heater must be
drained. The heater should be flushed with clean fresh water for several minutes to wash away all
traces of chemicals, then drained. It is recommended that the entire system is purged using
pressurised air to force remaining water from the system.

If water enters the refrigeration system due to heat exchanger failure, contact supplier for advice.
Caution! Motorised diverter valves must never be installed so that they can move through a
closed inlet position while the pump is operating and allow the system to pressurise. This
situation will void the Rheem Thermal warranty and may significantly damage the hot water
system and other system equipment.
Rheem Thermal Manual
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Heat Exchanger Care

9 04/02/2021