Checking The Indoor Electrical Equipment - Mitsubishi Heavy Industries SRK25ZJ-S Technical Manual
Inverter wall mounted type residential air-conditioners (split system, air to air heat pump type)
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Also See for SRK25ZJ-S:
- Technical manual (273 pages) ,
- Service manual (162 pages) ,
- Data book (60 pages)
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(b) Outdoor unit
Operation
Sensor
mode
Cooling
Heat exchanger
sensor
Heating
Cooling
Ourdoor air
temperature sensor
Heating
Discharge pipe
All modes
sensor
10.9 Checking the indoor electrical equipment
(a) Indoor PCB check procedure
Is there voltage between terminal
blocks
and
? (AC 220/230/240
V)
YES
Is the fuse burnt out? (3.15 A)
YES
Is the voltage between terminal
blocks
and
oscillating between
DC 0 and 20V?
YES
Indoor electrical components
are normal.
(b) Indoor unit fan motor check procedure
1) Indoor PCB output check
DC several V
(4~6 V)
CNU
2) Fan motor resistance check
Measuring point
Shortcircuit
NO
Inspect power source
for outdoor unit.
NO
Replace fuse.
NO
Replace indoor PCB.
(–)
GND
DC15V
FM
I
Resistance when normal
85
-
Phenomenon
Defrosting is performed for 10 minutes at approx. 45 (models 50, 60 : 35) minutes.
Defrosting is performed for 10 minutes at approx. 45 (models 50, 60 : 35) minutes.
DC 308~336V
Indoor PCB
-
'09•SRK-DB-087D
'10 • SRK-T-098
Disconnected wire
Measuring
Resistance when
point
normal
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