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Mitsubishi Heavy Industries Manuals
Air Conditioner
SCM50ZS-S1
Technical manual
Checking The Indoor Electrical Equipment - Mitsubishi Heavy Industries SCM50ZS-S1 Technical Manual
Inverter multi-split system residential air-conditioners
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
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Cooling
Heat exchanger
sensor
Heating
Cooling
Ourdoor air
temperature sensor
Heating
Discharge pipe
All modes
sensor
(9) Checking the indoor electrical equipment
(a) Indoor PCB check procedure
Is there voltage between terminal
blocks ① and ② ? (AC 220/230/240
V)
YES
Is the fuse burnt out? (3.15 A)
YES
Is the voltage between terminal
blocks ② and ③ oscillating between
DC 0 and 20V?
YES
Indoor electrical components
are normal.
(b) Indoor fan motor check procedure
(i) Indoor PCB output check
1)
2)
3)
DC several V
(4 – 6V)
CNU
⑥
⑥
(ii) Fan motor resistance check
Measuring point
① − ③
−
④ − ③
−
NO
Inspect power source
for outdoor unit.
NO
Replace fuse.
NO
Replace indoor PCB.
(–)
GND
DC15V
⑤
④
③
②
⑤
④
③
②
FM
i
Resistance when normal
k
211
-
Defrosting is performed for 10 minutes at approx. 40 minutes.
Defrosting is performed for 10 minutes at approx. 40 minutes.
① ④
DC280V
Indoor PCB
①
①
-
'18 • SCM-T-251
⑤
Measuring
Resistance when
point
normal
① − ③
④ − ③
⑤ − ③
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Table of Contents
Troubleshooting
MAINTENANCE DATA
196
Troubleshooting procedure (If the air-conditioner runs)
197
Troubleshooting procedure
220
Troubleshooting flow
228
Troubleshooting
229
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This manual is also suitable for:
Scm60zm-s1
Srk20zsx-s
Srk20zsx-w
Srk25zsx-s
Srk25zsx-w
Srk35zsx-s
...
Show all
Srk35zsx-w
Srk50zsx-s
Srk50zsx-w
Srk60zsx-s
Srk60zsx-w
Srk20zs-s
Srk20zs-w
Srk25zs-s
Srk25zs-w
Srk35zs-s
Srk35zs-w
Srk50zs-s
Srk50zs-w
Skm20zsp-s
Skm25zsp-s
Skm35zsp-s
Srf25zmx-s
Srf35zmx-s
Srf50zmx-s
Srr25zm-s
Srr35zm-s
Srr50zm-s
Srr60zm-s
Fdtc25vf
Fdtc35vf
Fdtc50vf
Fdtc60vf
Fde50vg
Fdum50vf
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