Mitsubishi Electric MUZ-FH35VEHZ User manual

SERVICE MANUAL
Models
OUTDOOR UNIT
Indoor unit service manual
MSZ-FH•VE Series (OBH623)
PARTS CATALOG (OBB625)
MUZ-FH25VEHZ
MUZ-FH35VEHZ
MUZ-FH25VEHZ -E1 , E3 , E4 , ER1 , ER3 , ER4 , ET1 , ET2
MUZ-FH35VEHZ -E1 , E2 , ER1 , ER2 , ET1 , ET2
MUZ-FH50VEHZ -E1 , E2 , ER1 , ER2 , ET1 , ET2
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS··················4
3. SPECIFICATION ········································5
4. NOISE CRITERIA CURVES··························8
5. OUTLINES AND DIMENSIONS·····················9
6. WIRING DIAGRAM··································· 11
7. REFRIGERANT SYSTEM DIAGRAM ··········· 14
8. PERFORMANCE CURVES ························ 16
9. ACTUATOR CONTROL ····························· 28
10. SERVICE FUNCTIONS······························ 29
11. TROUBLESHOOTING ······························· 30
12. DISASSEMBLY INSTRUCTIONS················· 53
No. OBH625
REVISED EDITION-G
OBH625 REVISED EDITION-F is void.
Revision G:
• A warning when opening or closing the
valve has been added.
HFC
utilized
R410A

2
Use the specied refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to
follow the instructions.
Revision A:
• MUZ-FH50VEHZ- E1 has been added.
Revision B:
• MUZ-FH25VEHZ- ER1 , MUZ-FH25VEHZ- ER1 and MUZ-FH50VEHZ- ER1 have been added.
Revision C:
• MUZ-FH25VEHZ- E3 and MUZ-FH25VEHZ- ER3 have been added.
Revision D:
• MUZ-FH25VEHZ- ET1 , MUZ-FH35VEHZ- ET1 and MUZ-FH50VEHZ- ET1 have been added.
Revision E:
• MUZ-FH25VEHZ-
E4
,
ER4
,
ET2
, MUZ-FH35VEHZ-
E2
,
ER2
,
ET2
and MUZ-FH50VEHZ-
E2
,
ER2
,
ET2
have been added.
Revision F:
• Resistance value of the defrost heater for MUZ-FH25VEHZ- E1 , E3 , E4 , ER1 , ER3 ,ER4 , ET1 , ET2 and MUZ-
FH35VEHZ- E1 , E2 , ER1 , ER2 , ET1 , ET2 has been corrected (11-4.).
Revision G:
• A warning when opening or closing the valve has been added.
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
WARNING
• When the refrigeration circuit has a leak, do not execute pump down with the
compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the
refrigerant pipes. The compressor may burst if air etc. get into it.
• When opening or closing the valve below freezing temperatures, refrigerant may
spurt out from the gap between the valve stem and the valve body, resulting in injuries.
OBH625G

3
MUZ-FH25VEHZ - E1
MUZ-FH35VEHZ - E1
MUZ-FH50VEHZ - E1
1. New model
MUZ-FH25VEHZ - ER1
MUZ-FH35VEHZ - ER1
MUZ-FH50VEHZ - ER1
1. New model
MUZ-FH25VEHZ - E1 MUZ-FH25VEHZ - E3
1. Inverter P.C. board has been changed.
2. Compressor has been changed.
MUZ-FH25VEHZ - ER1 MUZ-FH25VEHZ - ER3
1. Inverter P.C. board has been changed.
2. Compressor has been changed.
MUZ-FH25VEHZ - ET1
MUZ-FH35VEHZ - ET1
MUZ-FH50VEHZ - ET1
1. New model
MUZ-FH25VEHZ - E3 MUZ-FH25VEHZ - E4
1. Model name has been changed.
2. Compressor has been changed.
MUZ-FH35VEHZ - E1 MUZ-FH35VEHZ - E2
MUZ-FH50VEHZ - E1 MUZ-FH50VEHZ - E2
1. Model name has been changed.
MUZ-FH25VEHZ - ER3 MUZ-FH25VEHZ - ER4
1. Model name has been changed.
2. Compressor has been changed.
MUZ-FH35VEHZ - ER1 MUZ-FH35VEHZ - ER2
MUZ-FH50VEHZ - ER1 MUZ-FH50VEHZ - ER2
1. Model name has been changed.
MUZ-FH25VEHZ - ET1 MUZ-FH25VEHZ - ET2
MUZ-FH35VEHZ - ET1 MUZ-FH35VEHZ - ET2
MUZ-FH50VEHZ - ET1 MUZ-FH50VEHZ - ET2
1. Model name has been changed.
TECHNICAL CHANGES1
OBH625G

4
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
MUZ-FH25VEHZ
MUZ-FH35VEHZ
PART NAMES AND FUNCTIONS
2
MUZ-FH50VEHZ - E1 , ER1 , ET1
MUZ-FH50VEHZ - E2 , ER2 , ET2
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
OBH625G

5
Outdoor model MUZ-FH25VEHZ MUZ-FH35VEHZ
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated (Min.-Max.)
Cooling kW 2.5 (0.8 - 3.5) 3.5 (0.8 - 4.0)
Heating 3.2 (1.0 - 6.3) 4.0 (1.0 - 6.6)
Breaker Capacity A 10 12
Electrical data
Power input *1 (Set) Cooling W485 820
Heating 580 800
Running current *1 (Set) Cooling A2.6 3.9
Heating 2.9 3.8
Power factor *1 (Set) Cooling %81 91
Heating 86 91
Starting current *1 (Set) A 2.9 3.9
Coe󰀩cient of performance
(COP) *1 (Set)
Cooling 5.15 4.27
Heating 5.52 5.00
Compressor
Model
E1 , E4 , ER1 ,
ER4 , ET1 , ET2 SNB140FRUMT SNB140FRUMT
E3 , ER3 SNB130FGAMT
Output W
E1 , E4 , ER1 ,
ER4 , ET1 , ET2 950 950
E3 , ER3 900
Current *1 Cooling A2.04 3.32
Heating 2.34 3.22
Refrigeration oil (Model) L 0.35 (FV50S)
Fan motor
Model RC0J50-CI
Current *1 Cooling A0.28 0.30
Heating 0.28 0.30
Dimensions W × H × D mm 800 × 550 × 285
Weight kg 37
Special remarks
Dehumidication Cooling L/h 0.2 0.8
Air ow *1
Cooling High
m3/h
1,806
Low 1,038
Heating
High 2,016
Med. 1,710
Low 1,326
Sound
level *1
Cooling dB(A) 46 49
Heating 49 50
Fan speed
Cooling High
rpm
810
Low 490
Heating
High 900
Med. 770
Low 610
Fan speed regulator 3
Refrigerant lling capacity (R410A) kg 1.15
NOTE: Test conditions are based on 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
Refrigerant piping length (one way): 5 m
*1 Measured under rated operating frequency.
SPECIFICATION3
OBH625G

6
Outdoor model MUZ-FH50VEHZ
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated (Min. - Max.)
Cooling kW 5.0 (1.9 - 6.0)
Heating 6.0 (1.7 - 8.7)
Breaker Capacity A 16
Electrical data
Power input *1 (Set) Cooling W1,380
Heating 1,480
Running current *1 (Set) Cooling A6.1
Heating 6.5
Power factor *1 (Set) Cooling %98
Heating 98
Starting current *1 (Set) A 6.5
Coe󰀩cient of performance
(COP) *1 (Set)
Cooling 3.62
Heating 4.05
Compressor
Model SNB172FEKMT
Output W 1,200
Current *1 Cooling A4.98
Heating 5.37
Refrigeration oil (Model) L 0.40 (FV50S)
Fan motor
Model RC0J60-BC
Current *1 Cooling A0.83
Heating 0.84
Dimensions W × H × D mm 840 × 880 × 330
Weight kg 55
Special remarks
Dehumidication Cooling L/h 2.0
Air ow *1
Cooling
High
m3/h
3,006
Med. 3,006
Low 1,626
Heating
High 2,892
Med. 2,892
Low 2,280
Sound level *1 Cooling dB(A) 51
Heating 54
Fan speed
Cooling
High
rpm
840
Med. 840
Low 480
Heating
High 810
Med. 810
Low 650
Fan speed regulator 3
Refrigerant lling capacity (R410A) kg 1.55
NOTE: Test conditions are based on 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
Refrigerant piping length (one way): 5 m
*1 Measured under rated operating frequency.
OBH625G

7
Specications and rated conditions of main electric parts
Model
Item MUZ-FH25VEHZ MUZ-FH35VEHZ
Smoothing
capacitor (C61, C62) 600 µF/ 620 µF 420 V
Diode module (DB61) 15 A 600 V
Fuse (F61) T20AL250V
(F701, F801, F901) T3.15AL250V
Defrost heater (H) 230 V 130 W
Power module (IC700) 15 A 600 V
(IC932) 8A600V
Expansion valve
coil (LEV) 12 V DC
Reactor (L61) 23 mH
Power factor
controller (IC820) 20A 600V
Circuit
protection (PTC64, PTC65) 33 Ω
Terminal block (TB) 5 P
Relay
(X63) 3 A 250 V
(X64) 20 A 250 V
(X66) 3 A 250 V
(X69) 10A 230V
R.V. coil (21S4) 220 - 240 V AC
Heater protector (26H) Open 45°C
Specications and rated conditions of main electric parts
Model
Item MUZ-FH50VEHZ
Smoothing
capacitor
(CB1, CB2, CB3) 560 µF 450 V
Fuse
(F601, F880, F901) T3.15AL250 V
Defrost heater (H) 230 V 120 W
IGBT module (IC932) 5 A 600 V
(IC700) 20 A 600 V
Expansion valve
coil (LEV) 12 V DC
Reactor (L) 340 µH
Diode module (IC820) 20 A 600 V
Circuit
protection (PTC64, PTC65) 33 Ω
Terminal block (TB1, TB2) 3 P
Relay
(X64) 20 A 250 V
(X65) 20 A 250 V
(X69) 10 A 250 V
(X601) 3 A 250 V
(X602) 3 A 250 V
R.V. coil (21S4) 220 - 240 V AC
Heater protector (26H) Open 45 °C
OBH625G

8
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
HEATING
46
49
NC-10
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
HEATING
49
50
NC-10
MUZ-FH35VEHZ
NOISE CRITERIA CURVES4
Test conditions
Cooling: Dry-bulb temperature 35°C
Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C
OUTDOOR UNIT
MICROPHONE
1 m
MUZ-FH50VEHZ
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
HEATING
51
NC-10
54
MUZ-FH25VEHZ - E1 , E4 , ER1 , ER4 , ET1 , ET2
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
HEATING
46
49
NC-10
MUZ-FH25VEHZ - E3 , ER3
OBH625G

9
10
69
800
302.5
500 Bolt pitch for installation
150
22.3
Handle
550
280
164.5
99.5
170.5
23
Service panel
Service port
285
344.5
44
400
Air in
Air out
Air in
17.5
Bolt pitch for
installation
304~325
40
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø9.52
43
35
2 holes 10 X 21
REQUIRED SPACE
350 mm or more
100 mm or more
100 mm or more
Drain hole ø42
*1 100 mm or more when front
and sides of the unit are clear
*2 When any 2 sides of left, right
and rear of the unit are clear
Clear *1
200 mm or
more *2
Unit: mm
MUZ-FH25VEHZ
MUZ-FH35VEHZ
OUTLINES AND DIMENSIONS5
MUZ-FH50VEHZ - E1 , ER1 , ET1
417.5
40
42
Drain hole
175 500
330
50
Air in
Air out
2-holes 10 21
360
840
109
81
880
452
Service panel
99.5
164.5
195
35
44
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø12.7
350 mm or more
100 mm or more
REQUIRED SPACE
100 mm or more
500 mm
or more *2
*1 500 mm or more when front
and sides of the unit are clear
*2 When any 2 sides of left, right
and rear of the unit are clear
Clear *1
OBH625G

10
MUZ-FH50VEHZ - E2 , ER2 , ET2
417.5
40
42
Drain hole
175 500
330
50
Air in
Air out
2-holes 10 21
360
840
109
81
880
452
Service panel
99.5
164.5
195
35
44
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø12.7
350 mm or more
100 mm or more
REQUIRED SPACE
100 mm or more
500 mm
or more *2
*1 500 mm or more when front
and sides of the unit are clear
*2 When any 2 sides of left, right
and rear of the unit are clear
Clear *1
Unit: mm
OBH625G

11
WIRING DIAGRAM6
MUZ-FH25VEHZ - E1 , ER1 , ET1 , E3 , ER3
MUZ-FH35VEHZ - E1 , ER1 , ET1
OBH625G

12
MUZ-FH25VEHZ - E4 , ER4 , ET2
MUZ-FH35VEHZ - E2 , ER2 , ET2
OBH625G

13
MUZ-FH50VEHZ - E1 , ER1 , ET1 , E2 , ER2 , ET2
OBH625G

14
Unit: mm
MUZ-FH25VEHZ
MUZ-FH35VEHZ
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainar)
Stop valve
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
R.V. coil
heating ON
cooling OFF
Strainer
#100
LEV
Ambient
temperature
thermistor
RT65
Muffler
Capillary tube
ø4.0×ø2.4×240
Outdoor heat
exchanger
temperature
thermistor
RT68
Capillary tube
ø3.0×ø2.0×210
Muffler
REFRIGERANT SYSTEM DIAGRAM7
MUZ-FH50VEHZ
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
Stop valve
Capillary tube
ø 4.0 × ø 2.4 × 100
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe
ø 12.7
(with heat insulator)
Refrigerant pipe ø 6.35
(with heat insulator)
LEV
Muffler
R.V. coil
heating ON
cooling OFF
Muffler
#100
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
OBH625G

15
Max. Length
A
Max. Height
difference
B
Indoor
unit
Outdoor unit
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFEFRENCE
Model Refrigerant piping: m Piping size O.D: mm
Max. Length A Max. Height di󰀨erence B Gas Liquid
MUZ-FH25/35 20 12 9.52 6.35
MUZ-FH50 30 15 12.7 6.35
ADDITIONAL REFRIGERANT CHARGE (R410A: g)
Model Outdoor unit
precharged
Refrigerant piping length (one way)
7 m 8 m 9 m 10 m 11 m 12 m 13 m 14 m 15 m 20 m
MUZ-FH25/35 1,150 0 30 60 90 120 150 180 210 240 390
Calculation: X g = 30 g/m × (Refrigerant piping length (m) - 7)
Model Outdoor unit
precharged
Refrigerant piping length (one way)
7 m 10 m 15 m 20 m 25 m 30 m
MUZ-FH50 1,550 0 60 160 260 360 460
Calculation: X g = 20 g/m × (Refrigerant piping length (m) – 7)
OBH625G

16
The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi-
tions vary according to the areas where these units are installed, the following information has been provided to clarify the
operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
198 ~ 264 V, 50 Hz
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature: °C [WB]
}
Cooling
(2) Indoor outlet air wet-bulb temperature: °C [WB]
(3) Outdoor intake air dry-bulb temperature: °C [DB]
(4) Total input: W
(5) Indoor intake air dry-bulb temperature: °C [DB]
}
Heating(6) Outdoor intake air wet-bulb temperature: °C [WB]
(7) Total input: W
Indoor air wet and dry bulb temperature difference on the left side of the following chart shows the difference between the
indoor intake air wet and dry bulb temperature and the indoor outlet air wet and dry bulb temperature for your reference at
service.
How to measure the indoor air wet and dry bulb temperature difference
1. Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets
of wet and dry bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air
speed is high.
2. Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of room.
5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE.
6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
7. 10 minutes later, measure temperature again and check that the temperature does not change.
MUZ-FH25VEHZ
MUZ-FH35VEHZ
MUZ-FH50VEHZ
INDOOR UNIT OUTDOOR UNIT
Wet and dry bulb
thermometers
FRONT VIEW
Wet and dry bulb
thermometers
BACK VIEW
Cooling capacity ( at Rated frequency)
0.9
1.0
1.1
1.2
1.3
1.4
1.5
-10 -5 0 5 10 15 20 25 30 35 40 45
Outdoor intake air Dry-bulb temperature(°C)
Capacity correction factors
26
24
20
18
22
Indoor intake air Wet-bulb
temperature( )
MUZ-FH35VEHZ
MUZ-FH25VEHZ
Indoor air Wet-bulb temperature
difference (°C)
6.4
5.9
5.5
5.0
4.6
4.1
3.7
9.5
8.7
8.0
7.3
6.6
5.9
5.3
MUZ-FH50VEHZ
13.6
12.5
11.4
10.3
9.3
8.3
7.3
8-1. CAPACITY AND INPUT CURVES
PERFORMANCE CURVES8
OBH625G

17
NOTE: The above broken lines are for the heating operation without any frost and defrost operation.
0.8
0.9
1.0
1.1
1.2
1.3
-10 -5 0 5 10 15 20 25 30 35 40 45
Outdoor intake air Dry-bulb temperature (°C)
Input correction factors
26 24 22
20
18
Indoor intake air Wet-bulb
temperature( )
Indoor air Wet-bulb temperature
difference (°C)
5.5
5.0
4.6
4.1
3.7
3.2
8.0
7.3
6.6
5.9
5.3
4.6
MUZ-FH35VEHZ
11.4
10.3
9.3
8.3
7.3
6.4
MUZ-FH50VEHZ MUZ-FH25VEHZ
Total input (Cooling :
at Rated frequency
)
Indoor air Dry-bulb temperature
difference (°C)
15.9
14.6
13.4
12.2
11.0
9.8
8.5
7.3
6.1
4.9
MUZ-FH25VEHZ
19.8
18.3
16.8
15.2
13.7
12.2
10.7
9.1
7.6
6.1
MUZ-FH35VEHZ
26.9
24.8
22.7
20.7
18.6
16.5
14.5
12.4
10.3
8.3
MUZ-FH50VEHZ
Outdoor intake air Wet-bulb temperature (°C)
-20 -15 -10 -5 0 5 10 15
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
Heating capacity
( at Rated frequency)
Capacity correction factor
15
20
26
Indoor intake air Dry-bulb temperature ( )
Indoor air Dry-bulb temperature
difference (°C)
15.9
14.6
13.4
12.2
11.0
9.8
8.5
7.3
6.1
4.9
MUZ-FH25VEHZ
19.8
18.3
16.8
15.2
13.7
12.2
10.7
9.1
7.6
6.1
MUZ-FH35VEHZ
26.9
24.8
22.7
20.7
18.6
16.5
14.5
12.4
10.3
8.3
MUZ-FH50VEHZ
Outdoor intake air Wet-bulb temperature (°C)
-20 -15 -10 -5 0 5 10 15
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
Total input (Heating : at Rated frequency )
Input correction factor
15
20
26
Indoor intake air Dry-bulb temperature ( )
OBH625G

18
8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR
0 50 100
0.5
1.0
1.5
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
1
2
3
0 50 100 150
1
2
3
0 50 100 150
1
2
3
4
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100 150
1
2
3
0 50 100 150
1
2
3
4
0 50 100 150
0.5
1.0
1.5
2.0
0 50 100 150
1
2
3
MUZ-FH35VEHZ
Correction of Cooling capacity
The operational frequency
of compressor (Hz)
Capacity correction factors
Correction of Cooling input
The operational frequency
of compressor (Hz)
Input correction factors
Correction of Heating capacity
The operational frequency
of compressor (Hz)
Capacity correction factors
Correction of Heating input
The operational frequency
of compressor (Hz)
Input correction factors
Correction of Cooling capacity
The operational frequency
of compressor (Hz)
Capacity correction factors
Correction of Cooling input
The operational frequency
of compressor (Hz)
Input correction factors
Correction of Heating capacity
The operational frequency
of compressor (Hz)
Capacity correction factors
Correction of Heating input
The operational frequency
of compressor (Hz)
Input correction factors
Correction of Cooling capacity
The operational frequency
of compressor (Hz)
Capacity correction factors
Correction of Cooling input
The operational frequency
of compressor (Hz)
Input correction factors
Correction of Heating capacity
The operational frequency
of compressor (Hz)
Capacity correction factors
Correction of Heating input
The operational frequency
of compressor (Hz)
Input correction factors
Correction of Cooling capacity
Capacity correction factors
Correction of Cooling input
Input correction factors
MUZ-FH50VEHZ
The operational frequency
of compressor (Hz)
The operational frequency
of compressor (Hz)
Correction of Heating capacity
Capacity correction factors
Correction of Heating input
Capacity correction factors
The operational frequency
of compressor (Hz)
The operational frequency
of compressor (Hz)
MUZ-FH25VEHZ- ,
E1 ER1 ,ER4
MUZ-FH25VEHZ- ,
E3 ER3
ET1 ,ET2
E4 ,,
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100 150
0.5
1.0
1.5
2.0
0 50 100 150
0.5
1.0
1.5
2.0
2.5
8-3. HOW TO OPERATE FIXED-FREQUENCY OPERATION
<Test run operation>
1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice).
2. Test run operation starts and continues to operate for 30 minutes.
3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode.
4. Indoor fan operates at High speed.
5.
After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor varies).
6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on
remote controller.
OBH625G

19
15 20 25 30 35
0.4
0.5
0.6
0.7
0.8
0.9
15 20 25 30 35
0.4
0.5
0.6
0.7
0.8
0.9
15 20 25 30 35
0.4
0.5
0.6
0.7
0.8
Ambient temperature(°C)
Ambient humidity(%)
15 20 25 30 35
0.3
0.4
0.5
0.6
0.7
0.8
(kgf/cm2[Gauge])(MPa [Gauge])
6
5
4
7
8
9
(kgf/cm2[Gauge])(MPa [Gauge])
3
5
4
6
7
50 60 70
Ambient temperature(°C)
Ambient humidity(%)
50 60 70
Ambient temperature(°C)
Ambient humidity(%)
Outdoor low pressure
MUZ-FH35VEHZ
(kgf/cm2[Gauge])(MPa [Gauge])
6
5
4
7
8
9
50 60 70
Ambient temperature(°C)
Ambient humidity(%)
MUZ-FH50VEHZ
(kgf/cm2[Gauge])(MPa [Gauge])
50 60 70
3
5
4
6
7
8
MUZ-FH25VEHZ- ,
E3 ER3
MUZ-FH25VEHZ- ,
E1 ER1 ,
ER4 ET1 ,ET2
E4 ,
,
COOL operation
Both indoor and outdoor unit are under the same temperature/
humidity condition.
Operation: TEST RUN OPERATION (Refer to 8-3.)
8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
Dry-bulb temperature (°C) Relative humidity (%)
20 50
25 60
30 70
NOTE:
The unit of pressure has been changed to MPa on the international system of units (SI unit system)
The conversion factor is: 1 (MPa [Gauge]) = 10.2 (kgf/cm2 [Gauge])
15 20
50
25
60
30
70
35
1.5
2.0
2.5
3.0
15 20
50
25
60
30
70
35
2.5
3.0
3.5
4.0
4.5
15 20
50
25
60
30
70
35
1.5
2.0
2.5
3.0
15 20
50
25
60
30
70
35
3
4
5
6
7
8
MUZ-FH50VEHZ
Ambient temperature (°C)
Ambient humidity(%)
Outdoor current (A)
MUZ-FH25VEHZ- ,
E3 ER3
Ambient temperature (°C)
Ambient humidity(%)
Outdoor current (A)
Ambient temperature (°C)
Ambient humidity(%)
Outdoor current (A)
Ambient temperature (°C)
Ambient humidity(%)
Outdoor current (A)
MUZ-FH35VEHZ
Outdoor unit current
MUZ-FH25VEHZ- ,
E1 ER1 ,ER4 ET1 ,ET2 E4 ,,
OBH625G

20
0 5 10 15 20 25
4.0
4.5
5.0
5.5
6.0
0 5 10 15 20 25
3.5
4.0
4.5
5.0
5.5
0 5 10 15 20 25
4.0
4.5
5.0
5.5
6.0
0 5 10 15 20 25
3
4
5
6
7
8
MUZ-FH25VEHZ- ,
E3 ER3
Ambient temperature (°C)
Outdoor current (A)
Ambient temperature (°C)
Outdoor current (A)
Ambient temperature (°C)
Outdoor current (A)
MUZ-FH35VEHZ
Outdoor unit current
MUZ-FH50VEHZ
Ambient temperature (°C)
Outdoor current (A)
MUZ-FH25VEHZ- ,
E1 ER1 ,ER4 ET1 ,ET2 E4 ,,
Condition:
Operation: Test run operation (Refer to 8-3.)
HEAT operation
Indoor Outdoor
Dry bulb temperature (°C) 20.0 2 7 15 20.0
Wet bulb temperature (°C) 14.5 1 6 12 14.5
OBH625G