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The cold water supply pressure must be sufficient to provide adequate flow at the fixtures.
EXPANSION CONTROL VALVE
Local regulations may make it mandatory to install an expansion control valve (ECV) in the cold water
line to the water heating system. In other areas, an ECV is not required unless the saturation index is
greater than +0.4 (refer to 'Water Supplies' on page 6). However, an ECV may be needed in a
corrosive water area where there are sufficient quantities of silica dissolved in the water.
The expansion control valve must always be installed after the non return valve and be the last valve
installed prior to the water heater (refer to diagram on page 13). A copper drain line must be run
separately from the drain of the relief valve.
RELIEF VALVE DRAIN
A copper drain line must be fitted to the relief valve to carry the discharge clear of the water heater.
Connect the drain line to the relief valve using a disconnection union. The pipe work from the relief
valve to the drain should be as short as possible and fall all the way from the water heater with no
restrictions. It should have no more than three right angle bends in it. Use DN20 pipe.
The outlet of the drain line must be in such a position that flow out of the pipe can be easily seen (refer
to AS/NZS 3500.4) - but arranged so hot water discharge will not cause injury, damage or nuisance.
The drain line must discharge at an outlet or air break not more than 9 metres from the relief valve.
In locations where water pipes are prone to freezing, the drain line must be insulated and not exceed
300 mm in length. In this instance, the drain line is to discharge into a tundish through an air gap of
between 75 mm and 150 mm.
For multiple installations the drain line from each water heater can discharge into a common tundish.
As the function of the temperature pressure relief valve on this water heater is to discharge
high temperature water under certain conditions, it is strongly recommended the pipe work
downstream of the relief valve be capable of carrying water exceeding 93°C. Failure to
observe this precaution may result in damage to pipe work and property.
PLUMBING CONNECTIONS
Domestic Hot Water Applications
For domestic hot water applications, one or more storage tanks are required. Connect the water
heater, pump and storage tanks in accordance with the principles shown in the diagrams below and on
pages 16 and 17 with the following in mind:
•
Install the storage tanks according to Equa-flow® principles as described in the installation
instructions supplied with the storage tanks and on page 16.
•
Install the water heaters according to Equa-flow® principles as shown in the diagram on page 18
•
A disconnection union must always be provided at the cold water inlet and hot water outlet on the
water heater to allow for disconnection of the water heater.
INSTALLLATION
15
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