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40
Issue 2 14/07/16
3
Installation
3.31.2 Unvented systems
Unvented Systems should be fitted by an Approved
Installer.
The water heater can be used on unvented hot water storage
systems with the addition of an Unvented Systems Kit, part
number B290, available from Andrews Water Heaters.
See Parts List on page 44. The wall bracket assembly (shown
below) is available as an optional extra (AWH Part No – B173).
When used in an unvented system, the ECOflo will supply hot
water at a pressure of 3.5bar (51lbf/in²), provided that this
pressure is available at the mains feed. During conditions of no-
flow, system pressure may rise to a maximum of 6 bar (87lbf/in²)
whilst the burner is operating. When testing the system, it is
recommended that a maximum test pressure of 8.6 bar
(125lbf/in²) is employed.
The expansion vessel C4 supplied is suitable for the stored
volume of the water heater.
FOR SYSTEMS WITH LARGER PIPE VOLUMES OR
ADDITIONAL STORAGE, EXPANSION VESSELS WITH MORE
CAPACITY ARE AVAILABLE – CONTACT THE ANDREWS
SALES OFFICE FOR FURTHER DETAILS.
The combined temperature and pressure relief valve C5, must
be installed into the horizontal 1” dia. male tapping. A 1” dia.
socket (not supplied) is required as the T&P valve is also a male
fitting. The discharge pipe from items C3 and C5 must be
connected into tundish C6.
When assembling items C1 and C2, ensure that the flow arrows
marked on the components are pointing in the direction of flow,
i.e. towards the water heater. The cold water for services may be
drawn from the 22mm compression port on item C2(a). The
water pressure at this point will be similar to that available at the
hot water outlet of the water heater. If port (a) is not used, it
should be sealed with the blanking plug supplied.
If higher flow rates are required for the cold water services, a
suitable tee fitting should be fitted to the pipework upstream of
item C1.
The pipework fitted to the tundish outlet should be one size
larger than the outlet pipe of the safety device and should be
terminated at a suitable drain.
(See Building Regulations 1992 Approved Document G3).
All fittings and materials must be suitable for use with drinking
water and listed in the current Water Research Centre “Materials
and Fittings Directory”.
Installation of unvented storage hot water systems must comply
with Part G3 of the Building Regulations 1992.
Fig. 18
NB: Tees, elbows,stop valves and
pipework not supplied
C4
C5 Temperature/pressure relief valve
Cold water inlet of
water heater
C2 Check
valve assembly
C1 Combined pressure
reducing valve/strainer
C7 Hose assembly
Balanced cold water
take-off (if required)
OPTIONAL PARTS
C6 Tundish
Cold water
inlet
(a)
C3 Expansion
valve