If a replacement mixer is not available, a pair of protective cover caps should be fitted to the inlets. For
product code see section 18.
For both practical and functional reasons along with environmental contamination reasons, the inlets
should not be left open.
Push the caps onto the inlets until they stop against the shoulder.
Take care not to damage the o-ring seals.
Secure the caps with grub screws as shown using a 3mm
hexagonal key. Leave the hot & cold supplies isolated.
Cover caps should be disinfected / sterilised when necessary.
As discussed in sections 12.9 & 12.10, for disinfection, we recommend parts be immersed in an ap-
propriate bactericidal solution.
The frequency of such disinfection actions will be derived from regular sampling carried out under the
regime of the Responsible Person (Water). We would not expect to need greater than 6 monthly fre-
quencies, hopefully considerably less.
The need for excessive use of this procedure would be indicative of the need for some root cause analy-
sis as there could be some system or behavioural problems that need addressing.
12.11 Disinfection solution
IMPORTANT:
Do not leave the mixer inlets open without a body or cover caps fitted.
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Protective cover caps
Maintenance continued…
IMPORTANT ADMINISTRATION NOTE:
Where an audit log document (report or electronic record) is being kept for a mixer,
consideration should be given to the mixer’s traceability during the demounting &
disinfecting process.
Avoid using disinfection solutions that contain ammonia. Note: ammonia can lead to stress
corrosion cracking of the brass components inside the fitting.
