3
3
INSTALLATION – GENERAL
(FIGS 3 & 5)
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.
COLD FEED
A 22mm cold water supply is recommended, how-
ever if a 15mm (1/2”) supply exists which provides
sufficient 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 Pullin
Evolution Solar and its associated controls to be
isolated and serviced.
COLD WATER COMBINATION VALVE ASSEMBLY
(FIG 1)
The 2-piece cold water combination valve assembly
can be located anywhere on the cold water mains
supply prior to the expansion vessel (see Fig. 5) but
the two pieces do not have to be installed together.
The pressure reducing valve incorporates the
pressure reducer & strainer and the expansion valve
incorporates the expansion & check valves. Ensure
that the valves are installed in the correct order and
orientation. No other valves should be placed
between the expansion valve and the Pullin Evolution
Solar unit. A connection can be made between the
expansion and pressure reducing valves to provide a
balanced cold water connection. The expansion
valve connection must not be used for any other
purpose.
EXPANSION VESSEL
The expansion vessel accommodates expansion that
results from heating the water inside the unit. The
unit is pre-charged at 3.5 bar. The expansion vessel
must be connected between the expansion valve
(see Fig. 1) and the Pullin Evolution Solar (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.
NOTE: DO NOT USE THE POTABLE WATER EXPAN-
SION VESSEL SUPPLIED WITH THE PULLIN
EVOLUTION SOLAR FOR ANY OTHER PURPOSE. IT
IS NOT SUITABLE FOR USE ON A SOLAR
PRIMARY CIRCUIT.
SECONDARY CIRCULATION
If secondary circulation is required it is recommended
that it be connected to the Pullin Evolution Solar as
shown in Fig. 2. The secondary return pipe should be
in 15mm pipe and incorporate a check valve to pre-
vent backflow. A suitable WRAS approved bronze cir-
culation 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)
Secondary circulation is NOT recommended for direct
electric units being used on Off Peak electricity tariffs.
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.
DRAIN TAP
A suitable draining tap should be installed in the cold
water supply to the Pullin Evolution Solar unit
between the expansion valve (see Fig. 1) and the
heater at as low a level as possible. It is recom-
mended that the outlet point of the drain pipework
be at least 1 metre below the level of the heater
(this can be achieved by attaching a hose to the
drain tap outlet spigot).
Fig. 1: Cold water combination valve assembly
Fig. 2: Secondary circulation connection
SECONDARY
CIRCULATION
PUMP
SECONDARY
RETURN
CHECK
VALVE
OUTLET T&P RELIEF
VALVE
SECONDARY
RETURN
CONNECTION
INLET
OUTLET
EXPANSION
VALVE
OUTLET
PRESSURE
REDUCING
VALVE
CARTRIDGE
& STRAINER
DIRECTION OF FLOW
BALANCED COLD
WATER CONNECTION
(NOT SUPPLIED)
EXPANSION VALVE
PRESSURE REDUCING VALVE
CHECK
VALVE