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6. Installation
6.1 General
After reading the previous sections in this booklet and
choosing a suitable location for the appliance please
install, paying attention to the following water, electrical
and commissioning sections.
Boiler selection (Indirect units only)
The boiler should have a control thermostat and non
`
self-resetting thermal cut-out and be compatible
with unvented storage water heaters.
Where use of a boiler without a thermal cut-out
`
is unavoidable a "low head" open vented primary
circuit should be used. The feed and expansion
cistern head above the cylinder should not exceed
2.5m.
Can be a sealed system or open vented type -
`
maximum primary pressure 10 bar but must be
fully pumped.
The boiler cannot be vented through the cylinder.
`
6.2 Water connections
WARNING
The cold water controls MUST be
`
fitted on the mains water supply to the
appliance.
PRV WARNING: IF THERE IS
`
AN UPSTREAM CHECK VALVE
OR FITTING WHICH MAY
PREVENT BACKFLOW THEN
HIGH PRESSURES CAN BE
EXPERIENCED DUE TO AMBIENT
TEMPERATURES WHICH CAN
CAUSE DAMAGE TO THE VALVES
AND FITTINGS
No control or safety valves should be
`
tampered with or used for any other
purpose.
The discharge pipe should not be
`
blocked or used for any other purpose.
The tundish should not be located
`
adjacent to any electrical components.
Refer to the installation schematic (Fig. 3, page 9) for
details on the pipework layout. Specific details for the
discharge pipework layout is also provided in Fig. 9 on
page 18.
All connections accept 22mm outside diameter
`
pipe (compression nuts and olives supplied). The
thread rate is 3/4" BSP Male parallel to accept
standard 3/4" BSP Female fittings if required.
The Cold Water Inlet Control kit supplied
`
incorporates a full flow isolating valve which will
enable the appliance to be isolated from the mains
supply for maintenance or servicing.
The location of the unit should allow access to the
`
T&P Relief valve to allow re-charging of the internal
air gap when necessary.
The draining tap supplied should be installed in
`
the cold water supply to the cylinder between the
expansion valve and the heater at as low a level
as possible.
It is recommended that the outlet point of the drain
`
pipework be at least 1 metre below the level of the
base of the appliance (this can be achieved by
attaching a hose to the drain tap outlet spigot).
Hot water distribution pipework should be 22mm
`
pipe with short runs of 15mm pipe to terminal
fittings such as sinks and basins. Pipe sizes may
vary due to system design.
13
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