Ecodan 150 Standard - General Installation Guidelines

16
INSTALLATION – GENERAL
PIPE FITTINGS
The connection points to the heating system are in 22mm copper pipe. The use of appropriately sized COMPRESSION
FITTINGS is recommended when connecting to the pipes. Solder ttings can be used, but extreme care must be taken to
ensure any anciallry components in close proximity are not damaged by heat. Push t type ttings can be used for connection
to the copper pipes.
The inlet connection to the cold water combination valve is 22mm compression. The cylinder outlet tting is suitable for
connection to 22mm o/dia pipe (compression nut and olive supplied). The outlet is also threaded 3/4” BSP male parallel
should threaded pipe connections be preferred.
COLD FEED
A 22mm cold water supply is recommended, however, if a 15mm (1/2”) supply exists which provides sufcient ow, this may
be used. More ow noise may be experienced from small bore pipes due to the increased water velocity through them.
A stopcock or servicing valve should be incorporated into the cold water supply to enable the cylinder and its associated
controls to be isolated and serviced.
PRESSURE REDUCING VALVE (Fig 3 below)
The 3.5 bar pressure reducing valve can be connected anywhere on the cold water mains supply prior to the Air Source
Heat Pump cylinder. There is no requirement to site it close to the unit, it can be located at a point where the mains supply
enters the premises if this is more convenient but you must install a non-return valve just after the reducing valve for ease
of maintenance.
Fig 3 - Pressure reducing valve
Fig 4 - Pressure relief valve (8 bar)
PRESSURE RELIEF VALVE (Fig 4 above)
Should a balanced pressure cold water supply be required to cold water outlets such as thermostatic shower mixer valves or
combination taps, the cold water balanced draw off connection should be taken from between the pressure reducing valve
and the pressure relief valve (see Fig 4 above). Branches to cold drinking water outlets should be taken directly from the
mains supply.
EXPANSION VESSEL
The expansion vessel accommodates expansion that results from heating the water inside the unit. The expansion vessel
is pre-charged at 3.5 bar. The expansion vessel must be connected between the expansion valve (see Fig. 4 above) and
the cylinder by connecting it to the expansion vessel tapping on the cold feed pipe (see Fig 1 for position of tapping). The
location of the expansion vessel should allow access to recharge the pressure as and when necessary, this can be done
using a normal car foot pump. It is recommended that the expansion vessel is adequately supported. An expansion vessel
wall mounting bracket is supplied for this purpose and should be tted.
TUNDISH
The tundish is supplied factory tted . Ensure it is not postitioned directly over any electrical device in case any water splashes
occur in the event of a safety valve discharge.
Outlet to Megaflo eco
Mains in
22mm compression connection
Take note of flow
direction
Pressure reducing valve
cartridge (3.5 Bar)
22mm compression connection
Outlet to cylinder
From cold water
combination
valve
Take note of ow
direction
Pressure relief valve
discharge connection
Pressure relief valve
“TEE” (incorporates
check valve)