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MULTIPLE INSTALLATIONS
A multiple installation of Rheem solar Premier Hiline water heaters on a single manifold or multiple manifolds
is possible, using the Rheem Equa-Flow
®
manifold principal, where large volumes of hot water are required.
The system may be installed with the solar water heaters as preheaters and their electrical heating units not
be connected to a power supply. Rheem commercial or heavy duty water heaters should be installed in series
with the solar water heaters to boost the water temperature during periods of poor or no solar gain.
Alternatively, the solar water heaters can be installed with their heating units connected to a power supply and
without in series booster water heaters.
An over temperature protection device should be fitted to each thermosiphon water heater when used as a
preheater to an inline booster water heater.
The cold water and hot water manifolds must be designed to balance the flow from each solar storage tank.
To achieve this, there are basic installation requirements and principles which must be followed:
1. The maximum number of solar storage tanks in a bank should be five (5), however several banks of solar
storage tanks can be installed.
2. The hot water line from the manifold must leave from the opposite end to which the cold water line enters
the manifold.
3. The solar storage tanks must be of the same model.
4. The cold water line, cold and hot water headers and hot water line must be sized to meet the requirements
of both AS/NZS 3500.4 and the application.
5. A non-return valve, isolation valve and if required a pressure limiting valve, must be installed on the cold
water line to the system.
6. A full flow gate valve or ball valve (not stop taps, as used on a single solar storage tank installation) must
be installed on both the cold water branch and hot water branch of each solar storage tank.
7. The expansion control valve for each solar storage tank can be installed into a brass Tee on the cold
branch to the tank after the gate valve or ball valve.
8. Non-return valves or pressure limiting valves must not be installed on the branch lines to the solar storage
tanks.
9. All fittings, valves and branch lines must be matched sets all the way along the manifold.
10. Sufficient space must be left to enable access, servicing or removal of
each solar storage tank.
11. The temperature pressure relief valve drain line from each solar
storage tank can terminate at a common tundish with a visible air break
at each drain discharge point. Refer to “Relief Drain Line” on page 59
and to the diagram on page 62.
Note: A temperature-operated bypass valve(s) or primary temperature
control valve(s) should be installed prior to the in-series water heater(s) if
the water heater has either an over temperature energy cut-out which can
be permanently disabled by high temperature hot water or a maximum
recommended inlet supply temperature less than the temperature of water
which can be supplied by this solar water heater.
Refer to the diagram on page 63 for installation and plant layout details.
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