Mitsubishi Electric Mr.Slim MUZ-GC25NA - C1 User manual

SERVICE MANUAL
CONTENTS
1. PART NAMES AND FUNCTIONS····················· 3
2. SPECIFICATION················································ 4
3. OUTLINES AND DIMENSIONS ························ 8
4. WIRING DIAGRAM············································ 9
5. REFRIGERANT SYSTEM DIAGRAM ············· 14
6. PERFORMANCE CURVES ····························· 18
7. ACTUATOR CONTROL··································· 23
8. SERVICE FUNCTIONS ··································· 24
9. TROUBLESHOOTING····································· 24
10. DISASSEMBLY INSTRUCTIONS···················· 54
Models
SPLIT-TYPE AIR CONDITIONERS
MUZ-GC25NA - C1
MUZ-GC35NA - C1
MUZ-GC35NA - C2
MUZ-GC50NA - C1
MUZ-GC50NA - C2
MUZ-GC60NA - C1
MUZ-GC60NA - C2
MUZ-GC71NA - C1
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH482
REVISED EDITION-C
OUTDOOR UNIT
Indoor unit service manual
MSZ-GC•NA Series (OBH481)
MUZ-GC25/35NA PARTS CATALOG (OBB482)
Please void OBH482 REVISED EDITION-B.
Revision C:
• MUZ-GC35NA - C2 has been added.

2
Revision A:
• MUZ-GC60NA - C2 has been added.
MUZ-GC60NA - C1 →MUZ-GC60NA - C2
1. Compressor has been changed. (SNB130FLDH1 →SNB130FGBH)
2. Outdoor electronic control P.C. board has been changed.
3. Refrigerant circuit has been changed.
MUZ-GC50NA - C1 →MUZ-GC50NA - C2
1. Compressor has been changed. (SNB130FLDH1 →SNB130FGBH)
2. Outdoor electrical parts have been changed.
3. Refrigerant circuit has been changed.
MUZ-GC35NA - C1 →MUZ-GC35NA - C2
1. Outdoor electrical parts have been changed.
2. Compressor has been changed. (KNB073FGDH →KNB073FGDHC)
Revision B:
• MUZ-GC50NA - C2 has been added.
Revision C:
• MUZ-GC35NA - C2 has been added.

3
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
MUZ-GC25NA MUZ-GC35NA
Piping
Air outlet
Air inlet
(back and side)
Drain hose
Drain outlet
MUZ-GC50NA MUZ-GC60NA MUZ-GC71NA
1PART NAMES AND FUNCTIONS

4
Outdoor model MUZ-GC25NA MUZ-GC35NA
Function Cooling Heating Cooling Heating
Power supply Single phase 220 - 230 V, 60 Hz
Capacity
Rated frequency (Min.-Max.) kW 2.5 (0.9-3.0) 3.2 (0.9-4.5) 3.2 (1.0-3.7) 3.6 (0.9-4.8)
Electrical data
Power outlet A 10
Running current (Total) A 3.88 4.44 5.26 5.14
Power input (Total) W 735 860 1,065 1,040
Power factor (Total) % 86 88 92 92
Starting current 1 (Total) A 4.44 5.26
Coefficient of performance (C.O.P) 1
(Total) 3.40 3.72 3.00 3.46
Compressor
Model KNB065FDTHC C1 KNB073FGDH
C2 KNB073FGDHC
Output W 500 550
Current 1 A 3.35 3.91 4.73 4.61
Fan motor Model RA6V21-BD
Current A 0.29
Dimensions W×H×D mm 684 × 540 × 255
Weight kg 26
Special remarks
Dehumidification /h 1.4 — 2 —
Air flow (High/Low) m3/h 1,860
Sound level dB 47 48 48 49
Fan speed rpm 830
Fan speed regulator 1
Refrigerant filling capacity
(R410A) kg 0.75
Refrigeration oil (Model) NEO22
NOTE : Test conditions are based on CNS 14464, ISO 5151.
Cooling : Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Outdoor Dry-bulb temperature 35°C
Heating : Indoor Dry-bulb temperature 20°C
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
1 Measured under rated operating frequency.
2SPECIFICATION

5
Outdoor model MUZ-GC50NA MUZ-GC60NA MUZ-GC71NA
Function Cooling Heating Cooling Heating Cooling Heating
Power supply Single phase 220 - 230 V, 60 Hz
Capacity Rated frequency
(Min.-Max.) kW 5.0 (1.2-5.8) 5.6 (1.2-7.8) 6.0 (1.2-6.7) 6.8 (1.2-8.1) 7.1 (1.4-8.3) 8.1 (1.4-9.6)
Electrical data
Power outlet A 20
Running current 1 (Total) A C1 8.26 8.22 C1 10.33 9.72 12.03 11.96
C2 8.08 C2 10.05
Power input 1 (Total) W C1 1,800 1,790 C1 2,160 2,010 2,540 2,500
C2 1,760 C2 2,100
Power factor 1 (Total) % 99 99 95 94 96 95
Starting current 1 (Total) A C1 8.26 C1 10.33 12.03
C2 8.22 C2 10.05
Coefficient of performance (C.O.P) 1
(Total)
C1 2.78 3.13 C1 2.78 3.38 2.80 3.24
C2 2.84 C2 2.86
Compressor
Model C1 SNB130FLDH1 C1 SNB130FLDH1 TNB220FMCHT
C2 SNB130FGBH C2 SNB130FGBH
Output W 850 1,300
Current 1 A 7.59 7.55 9.41 8.80 11.11 11.04
Fan motor Model RC0J60-AA
Current 1 A 0.32
Dimensions W×H×D mm 840 × 850 × 330
Weight kg 53 58
Special remarks
Dehumidification /h 1.7 — 1.6 — 2.5 —
Air flow 1 m3/h 2,940/1,650 2,940/2,210 2,940/1,650 2,940/2,210 2,940/1,650 2,940/2,210
Sound level 1 (High/Low) dB (A) 52/51 55/53 53/51 55/53 53/51 55/53
Fan speed (High/Low) rpm 800/480 800/620 800/480 800/620 800/480 800/620
Fan speed regulator 2
Refrigerant filling capacity
(R410A) kg 1.5 1.8 2
Refrigeration oil (Model) NEO22
NOTE : Test conditions are based on CNS 14464, ISO 5151.
Cooling : Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Outdoor Dry-bulb temperature 35°C
Heating : Indoor Dry-bulb temperature 20°C
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
1 Measured under rated operating frequency.

6
Specifications and rating conditions of main electric parts
Model
Item MUZ-GC25NA MUZ-GC35NA
Current transformer (CT) 20 A
Smoothing capacitor (C61, C62) 500 μF 420 V
Diode module (DB61) 15 A 600 V
(DB65) 10 A 600 V
Fuse (F61) 250 V 20 A
(F701, F801) 250 V 3.15 A
Intelligent power module (IPM) 10 A 600 V
Expansion valve coil (LEV) DC 12 V
Reactor (L61) 18 mH 7 A
Current-detecting resistor (R61) 45 mΩ5 W
(R825) 25 mΩ5 W
Current-limiting PTC thermistor (PTC64) 33 Ω
Terminal block (TB1,TB2) 3 P
Relay (X61) 5 A 250 V
(X63) 3 A 250 V
(X64) 20 A 250 V
R.V. coil (21S4) AC 220 - 240 V
Outdoor fan motor thermal fuse Open 126°C (RA6V21-BD)
IGBT (TR821) 30 A 600 V
Model
Item MUZ-GC50NA - C1 MUZ-GC60NA MUZ-GC71NA
Current transformer (CT1,2) ETQ19Z68AY
(CT61) ETQ19Z53AY
Smoothing capacitor (CB1,2,3) 560 μF 450 V
Fuse (F64) 250 V 2 A
(F801) 250 V 3.15 A
(F911) 250 V 1 A
Expansion valve coil (LEV) DC 12 V
Intelligent power module (IPM) PS21244-A
(HC930) PS21661-RZ
High pressure switch (HPS) – ACB-DB156 (for C2 )ACB-DB156
Reactor (L) 340 μH 20 A
Power factor controller (PFC) PS51259-A
Resistor (R64A,B) 10 Ω10 W
(R937A,B) 1.1 Ω2 W 2%
(RS1 - 4) 0.04 Ω7 W
Solenoid coil relay (SSR61) TLP3506
Terminal block (TB1) 3 P
(TB2) 3 P
Relay (X64) G4A
R.V. coil (21S4) AC 220 - 240 V

7
Model
Item MUZ-GC50NA- C2
Current transformer (CT) 20 A
(CT761, CT781) 15 A
Smoothing capacitor (C61, C62, C63) 620 F 420 V
Diode module (DB61) 25 A 600 V
(DB65) 25 A 600 V
Fuse (F61) T20AL250V
(F701, F801, F901) T3.15AL250V
Intelligent power module (IPM) 20 A 600 V
Expansion valve coil (LEV) DC 12 V
Reactor (L61) 23.0 mH
Current-detecting resistor
(R61, R62) 180 m5 W (2 elements)
(R825) 25 m5 W
(R937A, R937B) 1.1 2 W
Current-limiting PTC thermistor (PTC64, PTC65) 33 
Terminal block (TB1, TB2) 3 P
Relay (X63) 3 A 250 V
(X64) 20 A 250 V
R.V. coil (21S4) AC 220 - 240 V
IGBT (TR821) 30 A 600 V

8
MUZ-GC50NA MUZ-GC60NA MUZ-GC71NA
30°
35°
155
90
198
40
515
299
66
34
51
330
360
850
430
500169 80
121
840
Open as a rule
500 mm or more if
the front and both
sides are open
100 mm or more
200 mm or more if
there are obstacles
to both sides
Open as a rule
500 mm or more if the back,
both sides and top are open 350 mm or more
100 mm or more
Service panel
Gas refrigerant
pipe joint
Refrigerant pipe
(flared) ø12.7 (MUZ-GC50)
ø15.88 (MUZ-GC60/71)
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) ø6.35 (MUZ-GC50/60)
ø9.52 (MUZ-GC71)
REQUIRED SPACE
Drain holes ø33
20.8
144.6 89.6
255
145.5
Service panel
Service port
Air out
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø9.52
43°
40°
REQUIRED SPACE Basically open 100 mm or more
without any obstruction in front
and on both sides of the unit.
350 mm or more
100 mm or more
100 mm or more
100 mm or more
Open two sides of left,
right, or rear side.
Drain hole ø33
Air in
Air in
381.5
Bolt pitch for
installation
264~280
300
540
270
10
47.5
22.5
17.5
243
Bolt pitch for installation
500
684
61
105
Handle
2 holes 10×16
40
Unit : mm
MUZ-GC25NA MUZ-GC35NA
3OUTLINES AND DIMENSIONS

9
MUZ-GC25NA MUZ-GC35NA
4WIRING DIAGRAM

10
MUZ-GC50NA-C1 MUZ-GC60NA-C1