Mitsubishi Electric EHPT20Q-VM2EA Service Manual page 80

Annual Maintenance Log Book
Contractor name
Site name
Cylinder unit maintenance record sheet
Warranty number
No. Mechanical
Turn OFF water supply, drain potable circuit, remove mesh from strainer
1
clean and replace in strainer. *1
Drop the primary/heating system pressure to zero check and if necessary
2 top up the expansion vessel (1 bar). Air valve of expansion vessel is TR-
412.
Check and if necessary top up the concentration of anti-freeze/inhibitor (if
3
used in the system).
4
Open the pressure relief valves. Check for unrestricted discharge to the
tundish and that the valves reseat correctly. Check there are no blockages
5
in the tundish and associated pipework and re-pressurise to 1 bar.
Heat system and check pressure does not rise above 3 bar and no water
6
is released from the safety valves.
7 Release any air from the system.
8
the heat emitter does not rise when running the DHW mode.
Electrical
1 Check condition of cables.
2
3 Check and record the operation voltage.
Controller
1
2 Check operation of motorized valves ensure they reseat correctly.
3 Check battery power of wireless thermostat and replace if necessary.
Outdoor heat pump unit maintenance record sheet
Model number
Mechanical
1 Inspect grill and air inlet for trapped debris/damage.
2 Check condensate drain provision.
3 Check integrity of water pipework and insulation.
4 Check all electrical connections.
* Checks should be carried out once a year.
*1 Be sure to reattach the mesh after washing.
Note:
unit. This is especially important when installing on an existing system.
In addition to annual servicing, it is necessary to replace or inspect some parts after a certain period of system operation. Please see tables below for detailed instruc-
Parts which require regular replacement
Parts
Pressure relief valve (PRV)
Air vent (Auto)
Manometer
GCH15010
Replace every Possible failures
6 years Water leakage
Engineer name
Site number
Model number
Serial number
Frequency Notes
-
Frequency Notes
Frequency Notes
Serial number
Frequency Notes
Parts which require regular inspection
Parts Check every
Water circulation pump 1 50,000 hrs (7 years)
Parts which must NOT be reused when servicing
* O-ring
* Gasket
80
Possible failures
Water circulation pump
failure