Heatrae Sadia PremierPlus PES170D, Installation And User Manual

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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 connections be required.
3.2 COLD FEED
A 22mm cold water supply is recommended however, 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 Santon PremierPlus
solar 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 combination 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 PremierPlus solar unit. The expansion valve connection must not be used for any other purpose.
3.4 DRAIN TAP
A suitable draining tap should be installed in the cold water supply to the PremierPlus solar unit between the cold
water combination 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 heater (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 3.5 bar. The expansion vessel must be connected between the cold water combination valve and the
Santon PremierPlus solar (see Fig. 5). The location of the expansion vessel should allow access to recharge the pres-
sure 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 EXPANSION VESSEL SUPPLIED WITH THE PREMIER PLUS SOLAR
FOR ANY OTHER PURPOSE. IT IS NOT SUITABLE FOR USE ON A SOLAR PRIMARY CIRCUIT.
3.6 SECONDARY CIRCULATION
If secondary circulation is required it is recommended that it be connected to the Premier as shown in Fig. 2
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)
‘In direct electric installations where a secondary circulation is required particular attention should be paid by the
installer to maintain the return water temperature (guidelines state that a minimum of 55°C return temperature is
advisable) . Factors such as, but not limited to, secondary circulation flow rates, minimising heat loss of all second-
ary circuit pipework and timed operation during periods of high demand are critical to the correct operation and
longevity of the heating element(s) and thermostats.
Secondary circulation is not recommended for direct electric units using off-peak tariffs where the secondary circula-
tion is not controlled in conjunction with the heat source as performance can be affected.’
3.7 OUTLET
The hot water outlet is a 22mm compression fitting located at the top of the cylinder. Hot water distribution pipe-
work 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.