Estia HWS-1501CSHM3-UK, Инструкция по установке и обслуживанию

Страница: 4 / 16

4
3.0 INSTALLATION – GENERAL
3.1 PIPE FITTINGS
All pipe fittings are made via 22mm compression
fittings directly to the unit. The fittings are threaded
3/4”BSP male parallel should threaded pipe connec -
tions be required.
3.2 COLD FEED
A 22mm cold water supply is recommended however,
if a 15mm (1/2”) supply exists which provides suf -
ficient flow this may be used (although more flow
noise may be experienced).
A stopcock or servicing valve should be incorporated
into the cold water supply to enable the unit and its
associated controls to be isolated and serviced.
3.3 COLD WATER COMBINATION VALVE (FIG 1)
The Cold Water Combination Valve can be connected
anywhere on the cold water mains supply prior to the
Expansion Vessel (see Fig. 5). The Cold Water Com-
bination Valve is installed as a complete one-piece
unit. The valve incorporates the Pressure Reducer,
Strainer, Expansion Valve and Check Valve. Ensure
that the valve is installed with the direction of flow
arrows pointing in the right direction. No other valves
should be placed between the Cold Water Combination
Valve and the unit. The Expansion Valve connection
must not be used for any other purpose.
FIG. 1 Cold Water Combination Valve
FIG. 2 Secondary circulation connection
3.4 DRAIN TAP
A suitable draining tap should be installed in the
cold water supply to the unit between the Cold Water
Combination Valve and the cylinder 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 cylinder (this can be achieved by attaching a
hose to the drain tap outlet spigot).
3.5 EXPANSION VESSEL
The Expansion Vessel accommodates expansion that
results from heating the water inside the unit. The unit
is pre-charged at 0.35MPa (3.5 bar). The Expansion
Vessel must be connected between the Cold Water
Combination Valve and the water cylinder (see Fig.
5). 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
3.6 SECONDARY CIRCULATION
If secondary circulation is required it is recommended
that it be connected to the cylinder as shown in Fig. 2
via a swept tee joint into the cold feed to the unit.
The secondary return pipe should be in 15mm pipe
and incorporate a check valve to prevent backflow. A
suitable WRAS approved bronze circulation pump
will be required. On large systems, due to the increase
in system water content, it may be necessary to fit an
additional expansion vessel to the secondary circuit.
this should be done if the capacity of the secondary
circuit exceeds 10 litres.
Pipe capacity (copper)
15mm o/d = 0.13 l/m (10 litres = 77m)
22mm o/d = 0.38 l/m (10 litres = 26m)
28mm o/d = 0.55 l/m (10 litres = 18m)
3.7 OUTLET
The hot water outlet is a 22mm compression fitting
located at the top of the cylinder. Hot water distribu-
tion 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.
EXPANSION VALVE
COLD MAINS
CONNECTION
(22mm)
EXPANSION VALVE
OUTLET (15mm)
OUTLET
CONNECTION
(22mm)
PRESSURE
REDUCING
VALVE
HOUSING
PRESSURE
REDUCING
VALVE
CARTRIDGE (3.5 bar)
COLD
INLET
CONNECTION
COLD
SUPPLY
CHECK
VALVE
SECONDARY
RETURN
SECONDARY
CIRCULATION
PUMP
SWEPT
TEE