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The water supply must be of wholesome water quality (fluid category 1 as defined by the water
supply regulations 1999). In some areas of the UK the water supply may have a high level
of natural hardness. Whilst this is not detrimental to the quality of the water, in water heating
systems the calcium carbonate which causes the water’s “hardness” can precipitate onto
hot surfaces and in time adversely affect hot water performance. If the temporary hardness
of the cold water mains supply exceeds 200mg/l (check with your Water Supply Company)
it is recommended that some form of water treatment is considered. Any device selected
must be suitable for use in unvented water heating systems and not unduly affect the flow
rate capacity to the Electromax Solar cylinder, consult the manufacturer of the device for
details.
3.4.2 CONNECTION TO THE COLD WATER SUPPLY
Connection to the cold water supply can be from underneath the Electromax Solar or through
knock out panels at the front, bottom right hand side.
Connection is made by 22mm compression fitting.
Solder connections directly to the unit must not be made as the heat may damage the
Electromax Solar insulation materials. Damage caused by heat applied to solder fittings in
close proximity to the unit will not be covered by the warranty.
Solder connections may be used elsewhere in the system away from the Electromax Solar.
Use water soluble flux for making soldered joints and ensure any flux residue is removed
following installation
3.4.3 COLD WATER COMBINATION VALVE
EXPANSION VALVE
COLD MAINS
CONNECTION (22mm)
EXPANSION VALVE
OUTLET (15mm)
OUTLET CONNECTION
(22mm)
PRESSURE REDUCING
VALVE HOUSING
PRESSURE REDUCING
VALVE CARTRIDGE (3.5bar)
FIGURE 07: COLD WATER COMBINATION VALVE