Technical data

32
MULTIPLE INSTALLATIONS
A multiple installation of Rheem heat pump water heaters on a single manifold or multiple manifolds is
possible, using the Equa-Flow
®
manifold system, where large volumes of hot water is 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 pages 33 to 34).
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.
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 33
and to “Relief Drain Line” on page 29).
Refer to the diagrams on pages 33 to 34 for installation and plant layout details.
In addition to the basic installation requirements and principles of manifolding, the following requirements for
manifolding heat pump water heaters of this model must be followed:
1. The heat pump water heaters must be turned through 90° from a standard installation, with the front
cover facing the back of the adjacent water heater. This is to ensure the air intake and air discharge of
the heat pump are parallel to the adjacent heat pump water heater.
2. If the installation is alongside or adjacent to a wall, it is recommended to install the water heater with the
air intake facing in the direction of the wall and the air discharge facing away from the wall.
3. A minimum of 900 mm is required between the heat pump water heater and a wall to enable access and
servicing of the heat pump system.
4. A minimum of 900 mm is required between and in front of each heat pump water heater to enable
access, servicing or removal of the water heater.
5. A circulated hot water flow and return system must not be returned back into the heat pump water
heaters (refer to “Circulated Flow and Return System” on page 17).