Annual Maintenance - Mitsubishi Electric EHSD-MEC Installation Manual

6
Service and Maintenance

Annual Maintenance

It is essential that the hydrobox is serviced at least once a year by a qualified individual any spare parts required MUST be purchased from Mitsubishi Electric (safety matter).
NEVER bypass safety devices or operate the unit without them being fully operational.
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
Pressure relief valve (PRV)
Air vent (Auto/Manual)
Drain cock (Primary circuit)
Manometer
37
Replace every Possible failures
6 years Water leakage
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 maintenance
(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