Mitsubishi Electric EHSD-MEE - Annual Maintenance Log Book; Possible Failures

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13-3. Annual Maintenance Log Book
Contractor name Engineer name
Site name Site number
Hydrobox maintenance record sheet
Warranty number Model number
Serial number
No. Mechanical Frequency Notes
1
Isolate and drain hydrobox, remove mesh from internal strainer clean
and replace.
2
Open the pressure relief valve, check for unrestricted discharge to the
tundish and that the valve reseats correctly. Check there are no
blockages in the tundish and associated pipe work.
3
Drop the primary/heating system pressure to zero check and if necessary
top up the expansion relief vessel (1 bar). Air valve of expansion vessel
is TR-412.
4
Check and if necessary top up the concentration of anti-freeze/inhibitor (if
used in the system).
5
Top up the primary/heating system using an appropriate lling loop and
re-pressurise to 1 bar.
6
Heat system and check pressure does not rise above 3 bar and no water
is released from the safety valves.
7 Release any air from the system.
Refrigerant models only Frequency Notes
1 Refer to outdoor unit manual.
Electrical Frequency Notes
1 Check condition of cables.
2 Check rating and fuse tted on the electricity supply.
Controller Frequency Notes
1 Check eld settings against factory recommendations.
2 Check battery power of wireless thermostat and replace if necessary.
Outdoor heat pump unit maintenance record sheet
Model number Serial number
Mechanical Frequency Notes
1 Inspect grill, heat exchanger ns and air inlet for trapped debris/damage.
2 Check condensate drain provision.
3 Check integrity of water pipe work and insulation.
4 Check all electrical connections.
5 Check and record the operation voltage.
All the above checks should be carried out once a year.
Note:
Within the rst couple of months of installation, remove and clean the hydrobox’s strainer mesh plus any that are tted external to the hydrobox. 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-
tions. Replacement and inspection of parts should always be done by a competent person with relevant training and qualications.
Parts which require regular replacement
Parts Replace every Possible failures
Pressure relief valve (3 bar)
Air vent (Auto/ Manual)
Drain cock (Primary circuit)
Manometer
6 years Water leakage
Parts which must NOT be reused when servicing
* O-ring
* Gasket
Note:
•
Always replace the gasket for pump with a new one at each regular maintenance (every 20,000 hours of use or every 3 years).
•
Make sure to carry out annual check (turn the cap) on 3 bar PRV. This is not required for 5 bar PRV.
Parts which require regular inspection
Parts Check every Possible failures
Pressure relief valve
(3 bar)
1 year (turning the
knob manually)
PRV would be xed and
expansion vessel would
burst
Water circulation pump 20,000 hrs (3 years)
Water circulation pump
failure
OCH815A