38
MULTIPLE INSTALLATIONS
A multiple installation of Everhot water heaters on a single manifold or multiple manifolds is possible, using the
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
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. The outdoor
model must be spaced at minimum 890 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
39 and
on page 32).
41 for installation and plant layout details.
