Annual Maintenance Log Book - Mitsubishi Electric Ecodan EHSC series Installation Manual

7
Service and Maintenance

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

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  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 [EXCEPT EHPX]
 Refer to outdoor unit manual.
Electrical
 Check condition of cables.
2 Check rating and fuse fitted on the electricity supply.
Controller
 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
 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 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 instructions.
Replacement and inspection of parts should always be done by a competent person with relevant training and qualifications.
Parts which require regular replacement
Parts Replace every
Pressure relief valve (PRV)
Air vent (Auto/Manual)
Drain cock (Primary circuit) 6 years
Flexible hose
Manometer
Engineer name
Site number
Model number
Serial number
Frequency
Frequency
Frequency
Frequency
Serial number
Frequency
Parts which require regular inspection
Possible failures
Water leakage due to
brass/copper corrosion
(Dezincification)
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).
Notes
Notes
Notes
Notes
Notes
Parts Check every
Immersion heater 2 years
Water circulation pump 20,000 hrs (3 years)
Possible failures
Earth leakage causing
circuit breaker to activate
(Heater is always OFF)
Water circulation pump
failure
62