804545NZ - BW_AB Small_09.18 v1.02
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Concealed
Vent
Concealed
Inlet
45 mm
Step 3 – Connecting
THE FOLLOWING PROCEDURE IS TO BE DONE BY AN AUTHORISED
INSTALLER ONLY.
3.1 Plumbing
For exposed plumbing connection, connect the cold water inlet pipe from the
base of the heater directly to the 12.7 mm compression fittings.
For concealed plumbing connections, connect the cold water pipe through
the rear of the chassis using a 12.7 mm capillary elbow (# 63 Swivel
Elbows).
Cold water pipes must be flushed before connection to the inlet. Any
clogging due to sediment or fines will adversely affect the operation of the
heater.
It is recommended that the heater be installed with a stop cock which allows
it to be isolated from the mains supply for servicing.
Water pressure requirements:
Minimum - 70 kPa maximum - 700 kPa.
3.2 Venting
A vent at the base of the heater must be plumbed to a safe visible location
as, under certain conditions, it may discharge cold or boiling water and/or
steam.
For exposed vent plumbing, connect vent outlet from the base of heater to
a 12.7 mm pipe which has a continuous fall, is no more than 3 metres long,
has no more than 3 right angle bends, and visibly discharges to a waste
water drain.
Alternatively attach a tundish to the wall as shown and plumb away to
waste.
Note: when routing the plumbing for the vent / tundish installed and mains
inlet line, ensure you do not obstruct filter access for filter replacement.
1
2
Remove Filter Guard
Visible Tundish
Vent line
Installation Procedures
Warning: If pressure is likely
to exceed 700 kPa, a pressure
limiting valve must be installed
in the cold water supply line.
Zenith recommends a valve
rated at 350 kPa for this appli-
cation.
