150 mm
min
Hot water
cylinder
Mixer valve
Service
valve
Cold supply
Hot supply
Alternative
supply
Cold
water
mains
supply
Ring main
Drain
valve
Isolating switch
or pull cord
switch (both
fused at 3A)
Gate
valve
Service
valve
Other
draw-offs
Stopvalve
Cold water
cistern
Pump
Pipework to
fixed head
Fixed head
Dual control thermostatic mixer
6
INSTANTANEOUS WATER HEATERS
APPLIANCE CAPABILITIES
For best performance from the shower when
connected to an instantaneous water heater,
the appliance must be capable of raising
the temperature of the incoming water to a
minimum of 52°C (125°F) and delivering a flow
rate of not less than eight litres per minute.
Should simultaneous demands on the water
heater affect the water temperature then it is
advisable to fit the supplied flow limiters to
control the maximum flow.
To fit the flow limiters first remove the filter caps
from the hot and cold inlets. Each filter cap
contains a check valve and mesh debris filter,
held in place by a ‘C’ clip
(fig.7)
.
Carefully remove the ‘C’ clip and remove the
filter and check valve. Replace the existing check
valve with the combined check valve and flow
limiter supplied.
IMPORTANT:
When fitting the flow limiters
note the correct facing.
Refit the mesh filter and and secure in place
with the ‘C’ clip.
Repeat the process for the other filter cap. Screw
the filter caps back into the valve body.
With the flow limiters fitted and the system is in
use, the On/Off flow control should be turned
fully anti-clockwise to full flow setting.
'C' clip
Wire filter
Combined check valve
and flow limiter
Filter cap
Fig.7
Fig.6
(
diagrammatic view – not to scale)
