31
Maintenance Procedure- Checkvalve Cartridges
(Refer to Figure 10)
Hot water entering the cold supply, or vice versa, indicates that immediate
attention is necessary. This is carried out by removing and cleaning, or renewing
as necessary, the two Checkvalve cartridges.
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.
Location and removal of Checkvalve cartridges varies according to shower
control model:
Exact-3;
The Checkvalve cartridges are located in each inlet elbow, to remove
undo the Checkvalve cartridge head hexagon using a 24 mm A/F wrench and
pull free.
Exact-3 z;
The Checkvalve cartridges are located at the inlet of each elbow. To
remove, first release the outlet connection, then release the shower control
body from the offset connectors using a 32 mm wrench. Release the Checkvalve
cartridges using a 12 mm A/F hexagon wrench.
Caution!
Some water may be released at this point.
3.
The Checkvalve cartridge assembly may be cleaned by removal of the inlet
strainers, and flushing through under a jet of water to remove lodged particles.
Do not descale.
4.
Lightly wipe external seals and thread with a
silicone-only based lubricant
to
assist refitting.
5.
Re-assembly into the shower control is a reversal of the above procedures.
Do
not overtighten
when re-inserting cartridges.
6.
Restore the water supplies and check for leaks.
Checkvalve Cartridges
Figure 10
Exact-3
Exact-3 z