Service And Maintenance - Mitsubishi Electric EHSD-MED Service Manual

13

SERVICE AND MAINTENANCE

13-1. Annual Maintenance
It is essential that the hydrobox is serviced at least once a year by a qualified individual. Any required parts 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 additional filter items that are fitted external to
the hydrobox. This is especially important when installing on an old/existing pipe work system.
▪ The pressure relief valve (No. 10 on Figure 3.3) should be checked annually by turning the knob manually so that the medium is discharged, thus
cleaning the seal seat.
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 in-
structions. 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)
Manometer
13-2. Engineers Forms
Should settings be changed from default, please enter and record new setting in 'Field Setting' column. This will ease resetting in the future should the system use
change or the circuit board need to be replaced.
Commissioning/Field settings record sheet
Main remote controller screen
Main
Option
Setting DHW *4
Legionella prevention *4
Heating/ Cooling *3
Compensation Hi flow temp.
curve
set point
Lo flow temp.
set point
Adjust
Holiday
OCH712C
Replace every Possible failures
6 years Water leakage
Zone1 heating room temp.
Zone2 heating room temp. *1
Zone1 heating flow temp.
Zone2 heating flow temp. *2
Zone1 cooling flow temp. *3
Zone2 cooling flow temp. *3
Zone1 heating compensation curve
Zone2 heating compensation curve *2
Holiday mode
Forced DHW operation
DHW
Heating/Cooling
Energy monitor
Operation mode
DHW max. temp.
DHW temp. drop
DHW max. operation time
DHW mode restriction
DHW recharge
Active
Hot water temp.
Frequency
Start time
Max. operation time
Duration of maximum temp.
Zone1 operation mode
Zone2 operation mode *2
Zone1 outdoor ambient temp.
Zone1 flow temp.
Zone2 outdoor ambient temp. *2
Zone2 flow temp. *2
Zone1 outdoor ambient temp.
Zone1 flow temp.
Zone2 outdoor ambient temp. *2
Zone2 flow temp. *2
Zone1 outdoor ambient temp.
Zone1 flow temp.
Zone2 outdoor ambient temp. *2
Zone2 flow temp. *2
DHW *4
Heating/ Cooling *3
Zone1 heating room temp.
Zone2 heating room temp. *1
Zone1 heating flow temp.
Zone2 heating flow temp. *2
Zone1 cooling flow temp. *3
Zone2 cooling flow temp. *3
Parts which require regular inspection
Parts
Pressure relief valve (3 bar)
Temperature and pressure
relief valve
Immersion heater
Water circulation pump
(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 main-
tenance (every 20,000 hours of use or every 3 years).
• No need to inspect pressure relief valve (5 bar) because it does not con-
tact with water unless 3 bar PRV is broken.
Parameters
10°C to 30°C
10°C to 30°C
20°C to 60°C
20°C to 60°C
5°C to 25°C
5°C to 25°C
−9°C to + 9°C
−9°C to + 9°C
Active/Non active/Set time
On/Off
On/Off/Timer
On/Off/Timer
Consumed electrical energy/Delivered energy
Normal/Eco *5
40°C to 60°C *6
5°C to 30°C
30 to 120 min
30 to 120 min
Large/Standard
Yes/No
60°C to 70°C *6
1 to 30 days
00.00 to 23.00
1 to 5 hours
1 to 120 min
Heating room temp./ Heating flow temp./ Heating
compensation curve/ Cooling flow temp.
Heating room temp./ Heating flow temp./ Heating
compensation curve/ Cooling flow temp.
−30°C to +33°C *8
20°C to 60°C
−30°C to +33°C *8
20°C to 60°C
−28°C to +35°C *9
20°C to 60°C
−28°C to +35°C *9
20°C to 60°C
−29°C to +34°C *10
20°C to 60°C
−29°C to +34°C *10
20°C to 60°C
Active/Non active
Active/Non active
10°C to 30°C
10°C to 30°C
20°C to 60°C
20°C to 60°C
5°C to 25°C
5°C to 25°C
81
Check every Possible failures
1 year PRV would be fixed and
(turning the knob expansion vessel would
manually) burst
Earth leakage causing
2 years circuit breaker to activate
(Heater is always OFF)
Water circulation pump
20,000 hrs (3 years)
failure
Default setting Field setting Notes
20°C
20°C
45°C
35°C
15°C
20°C
0°C
0°C
—
—
On
On
—
Normal
50°C
10°C
60 min
30 min
Large *7
Yes
65°C
15 days
03.00
3 hours
30 min
Room temp.
Compensation curve
−15°C
50°C
−15°C
40°C
35°C
25°C
35°C
25°C
—
—
—
—
Non active
Active
15°C
15°C
35°C
25°C
25°C
25°C
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