Operation - Rheem TM039 Service Instructions Manual

Operation

The Rheem Water Star is designed to work in conjunction (in series) with a continuous
flow gas water heater, e.g. Rheem Continuous Flow models. It works as a booster water
heater to ensure immediate availability of hot water. As such the inlet pipe to the Rheem
Water Star is referred to as an inlet pipe, NOT a cold water pipe, as water flowing through
this pipe could have a temperature as high as 60ºC.
The Rheem Water Star is designed for use with continuous flow water heaters that have
an outlet temperature of 60°C.
Continuous flow gas water heaters pass several litres of water before the temperature
reaches a useable temperature. The Rheem Water Star stores 4 litres of water at 70°C
which is delivered immediately to the household plumbing saving on water usage each
time a hot tap is opened.
The Rheem Water Star is available in a 70ºC model only. To meet the requirements of
AS/NZS 3500.4, this model may require an additional tempering valve set at a maximum
of 50°C (depending on the application), to be installed in pipe work to ablution areas.
When a hot tap is opened, water passes through the continuous
flow gas water heater, which commences operation, into the
Rheem Water Star via a transfer valve. The hot water stored in the
cylinder (4 litres @ 70ºC) is immediately supplied to the household
plumbing (refer to Figure 1).
When the outlet temperature of the continuous flow gas water
heater (inlet temperature to the Rheem Water Star) has risen to
between 52°C and 56°C the transfer valve shuts off the water flow
to the storage cylinder and transfers the flow of hot water to the
Rheem Water Star‟s outlet pipe, effectively bypassing the Rheem
Water Star (refer to figure 2).
The water temperature in the Rheem Water Star storage cylinder is
maintained via a thermostat switching the active conductor to an
electric immersion element.
Figure 1
When the water temperature within the cylinder falls sufficiently the
thermostat contacts close supplying power to the element. Once the
water temperature reaches the set point of the thermostat (70°C),
the contacts open cutting power to the element.
A double pole „manual reset‟ over temperature cut out is
incorporated into the thermostat to provide additional protection in
the event the controlling thermostat contacts fail. The ECO contacts
open at a water temperature of between 80ºC and 88ºC
Figure 2
Figure 2
5
TM039 Rheem Water Star Service Instructions REV: A
Date of Issue: 02/09
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
This document is stored and maintained electronically by