Technical data

28
MULTIPLE INSTALLATIONS
A multiple installation of Rheem water heaters on a single manifold or multiple manifolds is possible, using
the Rheem Equa-Flow
®
manifold system, where large volumes of hot water are required. The Equa-Flow
principle will function with water heaters in line, around a corner or in rows back to back (refer to the
diagrams on page 29).
The cold water and hot water manifolds must be designed to balance the flow from each water heater. To
achieve this, there are basic installation requirements and principles which must be followed:
1. The maximum number of water heaters in a bank should be 8, however several banks of water heaters
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 water heaters must be of the same model.
4. The cold water line, cold and hot 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 and expansion control valve,
must be installed on the cold water line to the system.
6. A full flow gate valve or ball valve (not a stop tap, as used on a single water heater installation) must be
installed on both the cold water branch and hot water branch of each water heater.
7. Non return valves or pressure limiting valves must not be installed on the branch lines to the water
heaters.
8. All fittings, valves and branch lines must be matched sets all the way along the manifold.
9. Sufficient space must be left to enable access, servicing or removal of any water heater. Outdoor
630 260 models must be spaced at minimum 920 mm centres to provide the required clearance
between flue terminals.
10. The temperature pressure relief valve drain line from each water heater can terminate at a common
tundish (funnel) with a visible air break at each drain discharge point (refer to the diagram on page 29
and to “Relief Drain Line” on page 26).
Refer to the diagrams on pages 29 to 31 for installation and plant layout details.