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Version 1, 21 August 2019, 14 of 21
11.0
DISINFECTION
This fitting is equipped with a disinfecting feature, which allows an engineer to feed water from the hot inlet via a
temporary by-pass hose* into the cold inlet. This hot water then passes through the cold inlet, the thermostatic
mixing chamber and out through the mixed water outlet. The temporary bypass hose is inserted into special
valve connectors in the inlet tails normally concealed by the shrouds.
Safety Note: Care should be taken when carrying out the following procedure to avoid contact with hot water and
hot surfaces. We recommend the use of protective hand wear.
To disinfect the fitting proceed as follows:
1. Slide forward the wall shrouds.
2. Set sensor for continuous run and time required (see section 6.1).
3. Isolate both inlets by turning the isolation valves through 90° anti-clockwise (see picture 1 below).
4. Unscrew the two plugs (see picture 2
elow) and fit the two 3/ ’’ x / ’’ fittings from the Disinfection
kit (WM-PMDK). Fit the supplied flexi-hose between these fittings (see pictures 3 and 4 below).
5. Now turn the hot isolation valve clockwise (see picture 5 below).
6. Turn on the mixer. Hot water will now pass from the hot inlet, through the by-pass hose into the cold inlet
and into the thermostatic mixing chamber and spout.
7. Once the desired disinfection time is complete, isolate the hot water supply (see picture 5 below).
8. Remove hose and nipples and refit plugs (see pictures 6, 7 and 8 below). Turn on water supply (see
picture 9 below) and reset sensor for correct operation.
Warning:
hose will be hot after disinfection
process, remove with caution.
See Table 4 below for a guide to disinfection temperatures v/s time:
Temperature
Disinfection Time
60 degrees Celsius
30 Minutes
Table 4
65 degrees Celsius
15 Minutes
70 degrees Celsius
10 Minutes
1.
2.
3.
4.
5.
6.
7.
8.
9.
