18
Cleaning/Renewal of Parts
6.
The interior surface of the mixing valve body must be clean before refitting the
cartridge. Rinse the valve interior thoroughly in clean water to remove any debris
before refitting the cartridge.
Note!
The body interior must be cleaned carefully and not damaged in any way.
Do not use any abrasive material.
7.
Cartridges may only be cleaned by flushing through under a jet of clean water to
remove debris.
Do not descale. Descaling solution MUST not be used on any parts of the
320 valve. Cartridges are not serviceable, and must not be dismantled.
Cartridges cannot be tested in isolation, service condition should be assessed
as part of the performance check; refer
Commissioning Checks
.
8.
Examine all accessible seals for signs of deformation or damage, and renew as
necessary, taking care not to damage the seal grooves.
Re-assembly
9.
Identify which is the hot inlet to the mixing valve body, and align the cartridge
assembly accordingly.
Note!
There is a 'H' and 'C' marked on the cartridge. Make sure that the 'H' aligns
with the hot inlet and that the 'C' aligns with the cold inlet (refer to
Figure
3
).
Align the cartridge guides (refer to
Figure 3
) with the slots in the body and carefully
push the cartridge assembly back into the body, checking that the 2 cartridge
inlet port seals remain in place.
10.
Install the six screws and tighten.
11.
Fit the temperature indicating ring.
12.
Turn the isolation screw on the isolator valves through 90
o
to restore the water
supplies to the valve and check for any leaks.
13.
Before fitting the hub, the temperature will need resetting; refer to
COMMISSIONING
.
14.
Secure the temperature knob.