Mitsubishi Electric EHSD-MEE - Controller 13. Service and Maintenance

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13
SERVICE AND MAINTENANCE
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 qualications.
Parts which require regular replacement
Parts Replace every Possible failures
Pressure relief valve (PRV)
Manometer
Inlet control group (ICG)*1
6 years Water leakage
*1 OPTIONAL PARTS for UK
13-1. Annual Maintenance
It is essential that the indoor unit is serviced at least once a year by a qualied individual. Any required parts should be purchased from Mitsubishi Electric.
NEVER bypass safety devices or operate the unit without them being fully operational.
Note
▪ Within the rst couple of months of installation, remove and clean the indoor unit's strainer plus any additional lter items that are tted external to
the indoor unit. This is especially important when installing on an old/existing pipe work system.
▪ The pressure relief valve and T&P valve should be checked annually by turning the knob manually so that the medium is discharged, thus cleaning
the seal seat.
Parts which require regular inspection
Parts Check every Possible failures
Pressure relief valve (3 bar)
Temperature and pressure
relief valve
1 year
(turning the knob
manually)
It could seize and risk
burst of expansion ves
-
sel
Water circulation pump
(Primary circuit)
20,000 hrs (3 years)
Water circulation pump
failure
Magnetic lter 3 years
Flow rate decrease due
to clogging
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).
<Draining particles from the magnetic filter>
Note: DRAINED WATER MAY BE VERY HOT
1. Turn OFF the unit via the user interface.
2. Turn OFF the circuit breaker.
3. Check if body of the magnet lter is still tted tight (a).
4. Close the isolating valves.
5. Put a suitable bottle below the magnetic lter.
6. Remove fastener and open the cap of the lter (b).
7. Collect the water and particles in the bottle.
8. Wash the inside mesh and magnet and remove particles from them.
9. Put the inside mesh and magnet back into the lter.
10. Fit the cap with fastener.
11. Open the isolating valves.
12. Check the pressure of the water circuit.
a. body
b. cap
a
b
OCH815A