17
14 CHECK VALVES REPLACEMENT
To replace the check valves cartridges:
(REMEMBER TO TURN OFF WATER
SUPPLIES)
1. Seperate the shower valve from the wall
bracket by undoing the captive nuts. See
sect.4 step 9. Use 30mm A/F spanner.
2. Remove shower valve from wall, and keep
sealing washers safe.
3. The check valves are housed inside the
retaining inserts within the inlet bores.
Looking closely at the rear of the product,
note circlips hold the check valves in place.
Using circlip pliers, squeeze the circlip & lift it
away from the bore.
4. Gently pull out the check valves:
check & clean or replace if necessary.
Observe the ow direction arrow on the body
of the check valve. Ret the circlips.
ENSURE PARTS ARE
REASSEMBLED IN THE
CORRECT SEQUENCE.
1
2
3
4
13 COLD WATER ISOLATION (CWI) TEST
CWI test is a guide to showing the performance of the thermostat.
Prior to CWI test:
• Make sure that the Black H Clip is positioned in the 40°C slot on the temperature adjustment carrier
(see section 6) Remove temperature handle to check. If this has been removed then the fail-safe will
not work.
• Make sure the supply temperatures are within the ranges 55 to 65°C for hot, & 5 to 20°C for cold.
To perform a CWI test:
• Turn the product on using the ow handle, override the 50% economy ow stop on the handle & rotate
handle to max, giving 100% ow.
• The temperature handle button should be positioned at the front (parked at the 40°C nominal stop).
1. Record the steady state temperature of both hot and cold water supplies. Note the Δt.
2. Record the temperature of the mixed water at the outlet (preferably unscrew the shower hand set)
should be within range 40±1°C.
3. Isolate the cold water supply
If the ow ceases, CWI test passed. An ongoing reduced ne ow of water (pencil stream) from the
mixed water outlet is also acceptable as a pass.
Restore the cold supply & recheck the temperature at the mixed water outlet once stabilised.
If the ow has not reduced, the product has failed the CWI test. Product requires maintenance, cartridge
should be removed, cleaned & retested.
Additionally, clean all lters, ensure check valves are working, and make sure all isolating valves are
fully open.
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