13
Cold water control pack
CAUTION
`
Flush supply pipework before
connection to remove all flux and
debris prior to fitting the inlet
controls. Failure to do this may result
in irreparable damage to the controls
and will invalidate any warranty.
`
The cold water combination valve can be connected
anywhere on the cold water cylinder supply prior to
the expansion vessel.
`
No other valves should be placed between the
cold water combination valve and the cylinder.
`
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.
`
The pressure setting is set to 3.5 bar.
`
The valve can be fitted in any orientation to suit
the installation as long as the valve is installed with
the direction of flow arrows pointing in the correct
direction.
`
The expansion relief valve should be installed with
the discharge pipework in either the horizontal
position or facing downwards.
`
Where discharge pipework is difficult to attain, the
local building control officer from the local council
should be sought for advice as this falls under G3
guidelines and is not down to the manufacturer of
unvented systems
Primary circuit control
`
The 2 port motorised valve supplied with the
cylinder MUST be fitted on the primary flow to the
cylinder heat exchanger and wired such that in the
event of the cylinder overheating it will close the
primary circuit.
`
Primary circulation to the cylinder heat exchanger
must be pumped; gravity circulation WILL NOT
WORK.
`
It is recommended that an air bleed or automatic
air vent is incorporated in the primary return pipe
work close to the unit.
`
Boiler flow temperature should be set to 82°
(maximum flow temperature to primary heat
exchanger 88°C).
Figure 8: 3 bar pressure reducing valve
Expansion valve
Cold mains
connection
(22mm)
Expansion valve
outlet (15mm)
Outlet connection
(22mm)
Pressure reducing
valve cartridge
(3.5bar)
Direction of
flow
