Mitsubishi Electric EHSD-MED Service Manual page 84

13-3. Annual Maintenance Log Book
Contractor name
Site name
Hydrobox maintenance record sheet
Warranty number
No. Mechanical
Isolate and drain hydrobox, remove mesh from internal strainer clean and
1
replace.
Open the pressure relief valve, check for unrestricted discharge to
2 the tundish and that the valve reseats correctly. Check there are no
blockages in the tundish and associated pipe work.
Drop the primary/heating system pressure to zero check and if necessary
3 top up the expansion relief vessel (1 bar). Air valve of expansion vessel
is TR-412.
Check and if necessary top up the concentration of anti-freeze/inhibitor (if
4
used in the system).
Top up the primary/heating system using an appropriate filling loop and
5
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.
Refrigerant models only
1 Refer to outdoor unit manual.
Electrical
1 Check condition of cables.
2 Check rating and fuse fitted on the electricity supply.
Controller
1 Check field settings against factory recommendations.
2 Check battery power of wireless thermostat and replace if necessary.
Outdoor heat pump unit maintenance record sheet
Model number
Mechanical
1 Inspect grill, heat exchanger fins 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 first couple of months of installation, remove and clean the hydrobox's strainer mesh plus any that are fitted 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 qualifications.
Parts which require regular replacement
Parts
Pressure relief valve (3 bar)
Air vent (Auto/ Manual)
Drain cock (Primary circuit)
Manometer
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.
OCH712C
Replace every Possible failures
6 years Water leakage
Engineer name
Site number
Model number
Serial number
Frequency Notes
Frequency Notes
Frequency Notes
Frequency Notes
Serial number
Frequency Notes
Parts which require regular inspection
Parts Check every
Pressure relief valve 1 year (turning the
(3 bar) knob manually)
Water circulation pump 20,000 hrs (3 years)
84
Possible failures
PRV would be fixed and
expansion vessel would
burst
Water circulation pump
failure