27
Maintenance Procedure - Thermostatic Cartridge
(Ref to Fig 8)
Removal
1.
Isolate the supplies to the shower control, and open the flow control to release
pressure and to assist the draining of residual water.
2.
Remove the temperature knob assembly, using the 3 mm A/F hexagonal wrench
(supplied). Do not remove the temperature hub.
3.
With removal clip still in place, unscrew the head nut using a 35 mm A/F wrench.
This will release the body shroud and also begin to draw the Thermostatic cartridge
out of the shower control body.
Warning:
some residual water may be released.
4.
Note which inlet aligns with the
hot
(marked
H
and
red
) lug on cartridge.
5.
Pull the Thermostatic cartridge free of the shower control body.
Cleaning/Renewal of Parts
6.
The interior surface of the shower control body must be clean before refitting
cartridge. If scale or deposition is present, clean
(without Thermostatic, flow
and checkvalve cartridges fitted)
using a mild proprietary inhibited scale solvent,
e.g. domestic kettle descalent. After descaling, rinse body thoroughly in clean
water before refitting cartridges.
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 lodged particles.
Do not descale.
Cartridges are not serviceable,
and must not be dismantled.
Cartridges cannot be tested individually, service
condition should be assessed as part of the performance check; refer to
Commissioning Checks
.
8.
When renewing Thermostatic cartridge, retain the removal clip and head nut off
the displaced unit and refit.
9.
Examine all accessible seals for signs of deformation or damage, and renew as
necessary, taking care not to damage seal grooves (a Service Pack is available,
containing all seals and strainer screens that may be necessary for renewal
during maintenance or servicing.
10.
Lightly coat all seals with a
silicone-only based lubricant
to assist reassembling
(see
lubricants
).
Lubricants
Important!
All seals are pre-lubricated. If you need to lubricate the seals, use only a
small amount of silicone-only based lubricants on this product. Do not use oil-based
or other lubricant types as these may cause rapid deterioration of seals.