Rheem W2W Series, Owner'S Manual And Installation Instructions

Page: 35 / 72

MANIFOLD INSTALLATIONS
The Rheem commercial heat pump water heater is designed to be installed with
storage tanks on a single manifold, or multiple manifolds if required, using the
Rheem Equa-Flow
®
manifold system. 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
pages 36 to 37 ).
The cold water, primary flow and hot water manifolds must be designed to
balance the flow from each water heater and storage tank. To achieve this, there
are basic installation requirements and principles which must be followed:
1. The maximum number of storage tanks in a bank should be 10, however
several banks of 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 storage tanks 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 and storage tank.
7. Non return valves or pressure limiting valves MUST NOT be installed on the
branch lines to the water heaters or storage tanks.
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 or storage tank.
10. The temperature pressure relief valve drain line from each storage tank can
terminate at a common tundish (funnel) with a visible air break at each drain
discharge point.