Maintenance Sheet - Mitsubishi Electric ecodan PUHZ-W50VHA2 User Manual

Contractors Name
Site Name
Cylinder Maintenance
Mechanical Tasks
1. With the water supply turned off, remove the screen from the strainer in
the combination inlet valve and clean off any dirt
2.With the water supply turned off and the hot water taps open, check the
expansion vessel charge pressure and top up as necessary
3. With the water supply turned on, open the temperature relief valve and
then the expansion valve to check unrestricted discharge into tundish. Check
valves for freedom of movement and confirm that the water stops and both
valves reseat correctly. Check at a full bore discharge from either valve that
there is no back up or discharge over the tundish.
4. Check that the correct outlet pressure is being maintained by the pressure
reducing valve by recording the pressure at the terminal fitting or the tapping
provided on the combination inlet valve.
5. Clean flow regulators (or restrictor/aerators) on each terminal fitting tap//
shower as applicable. Check for correct flow rate at terminal fittings.
6.If necessary de-scale the heat exchangers immersion/heaters in hard water
areas.
7. Check and clean the Boiler Buddy.
8. Open the primary/heating system safety valve and check that it discharges
safely.
9. Drop the primary/heating system pressure to zero check and if necessary
top up the air side of the expansion vessel.
10. Check and if necessary top up the concentration of the heating system
Inhibitor.
11. Re-establish the primary/heating system pressure and disconnect the filling
loop.
12. Check the primary/heating system pressure does not rise above 2.5 bar
and the safety valve does not drip when the system is at full temperature.
13. Check and release any air from the primary/heating systems.
Electrical Tasks
1. Visually inspect, checking for the presence of supplementary bonding and
that it is being maintained.
2. Check correct rating and type of fuse is fitted on the electrical supply.
Controller Tasks
1. Check for the correct operation and temperature setting of the
thermostats.
2. Check the operation of the motorised valves.
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ENGINEERS FORMS

Maintenance Sheet

Engineers Name
Site Number
Frequency
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
Major Visit
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Records / Notes
Table 3.6