Annual Maintenance - Mitsubishi Electric ecodan ERST20 series Installationshandbuch

7
Service and Maintenance

Annual Maintenance

It is essential that the cylinder unit is serviced at least once a year by a qualified individual. Any spare parts required should be purchased from Mitsubishi Electric. NEVER
bypass safety devices or operate the unit without them being fully operational. For more details, refer to service handbook.
note: Within the first couple of months of installation, remove and clean the cylinder unit's strainer plus any that are fitted external to the cylinder unit. 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/Sanitary circuit)
Manometer
Inlet control group (ICG)*
*
OPTIONAL PARTS for UK
39
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)
(Primary circuit)
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