Annual Maintenance Log Book; Parts Which Require Regular Replacement; Parts Which Require Regular Inspection; Parts Which Must Not Be Reused When Servicing - Mitsubishi Electric EHSC-VM2B Service Manual

13-2. 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 fi lling 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 [EXCEPT EHPX]
1 Refer to outdoor unit manual.
Electrical
1 Check condition of cables.
2 Check rating and fuse fi tted on the electricity supply.
Controller
1 Check fi 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
Mechanical
1 Inspect grill, heat exchanger fi 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 fi rst couple of months of installation, remove and clean the hydrobox's strainer plus any that are fi tted external to the hydrobox. This is espe-
cially 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 qualifi cations.

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
OCH532A
Engineer name
Site number
Model number
Serial number
Frequency
Frequency
Frequency
Frequency
Serial number
Frequency
Possible failures
Water leakage due to
brass/copper corrosion
(Dezincifi cation)
85
Notes
Notes
Notes
Notes
Notes

Parts which require regular inspection

Parts Check every
Immersion heater 2 years
Water circulation pump 20,000 hrs (3 years)

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 mainte-
nance (every 20,000 hours of use or every 3 years).
Possible failures
Earth leakage causing
circuit breaker to activate
(Heater is always OFF)
Water circulation pump
failure