Mitsubishi MUZ-HC25VA-E1, MUZ-HC35VA-E1, MUZ-HC35VA-E2, MUZ-HC35VAB-E1, MUZ-HC35VAB-E2 Service Manual

Revision B:

• MUZ-HC35VA- E2 and MUZ-HC35VAB- E2 have

been added.

SPLIT-TYPE AIR CONDITIONERS

Please void OBH467 REVISED EDITION-A.

OUTDOOR UNIT

SERVICE MANUAL

HFC	No. OBH467
utilized	REVISED EDITION-B
R410A

Models

MUZ-HC25VA - E1 MUZ-HC35VA - E1 MUZ-HC35VA - E2 MUZ-HC35VAB - MUZ-HC35VAB -

E1

E2

Indoor unit service manual

MSZ-HC•VA Series (OBH466)

MSZ-CHC•VA Series (OBH522)

CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. PART NAMES AND FUNCTIONS····················· 4

3. SPECIFICATION················································ 5

4. NOISE CRITERIA CURVES ······························ 7

5. OUTLINES AND DIMENSIONS ························ 8

6. WIRING DIAGRAM············································ 9

7. REFRIGERANT SYSTEM DIAGRAM ··············11

8. PERFORMANCE CURVES ····························· 13

9. ACTUATOR CONTROL··································· 24

10. SERVICE FUNCTIONS···································· 25

11. TROUBLESHOOTING ····································· 25

12. DISASSEMBLY INSTRUCTIONS···················· 40

PARTS CATALOG (OBB467)

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

Revision A:

•Table “ADDITIONAL REFRIGERANT CHARGE” of “7. REFRIGERANT SYSTEM DIAGRAM” has been corrected.

Revision B:

• MUZ-HC35VA- E2 and MUZ-HC35VAB- E2 have been added.

2

1 TECHNICAL CHANGES

MUZ-HA25VA - E1 MUZ-HA35VA - E1 MUZ-HA35VA - E1

→MUZ-HC25VA - E1

→MUZ-HC35VA - E1

→MUZ-HC35VAB - E1

1. Outdoor model has been changed.

MUZ-HC35VA - E1 → MUZ-HC35VA - E2 MUZ-HC35VAB - E1 → MUZ-HC35VAB - E2

1. REFRIGERANT SYSTEM has been changed.

3

2 PART NAMES AND FUNCTIONS

MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB

Air inlet

Piping

Drain hose

Air outlet

Drain outlet

ACCESSORIES

Drain socket

1

4

3				SPECIFICATION
					Outdoor model							MUZ-HC25VA				MUZ-HC35VA				MUZ-HC35VAB
						Function						Cooling		Heating	Cooling			Heating		Cooling		Heating
					Power supply										Single phase			230 V, 50 Hz
					Capacity					kW		2.5		3.2	3.15			3.6		3.4		3.6
	Rated frequency (Min.-Max.)											(0.9-3.0)		(0.9-4.4)	(1.0-3.7)			(0.9-4.8)		(1.0-3.7)		(0.9-4.8)
data	Breaker capacity									A							10
	Running current						1 (Total)			A		3.7		4.2	4.8			4.8		5.3		4.8
Electrical
	Power input					1 (Total)				W		770		880	980			995		1130		995
	Power factor					1 (Total)				%		90		91	89			90		93		90
	Starting current						1 (Total)			A			4.2				4.8				5.3
Coefficient of performance (C.O.P)									1 (Total)			3.25		3.64	3.21			3.62		3.01		3.62
															E1			KNB073FEDH
					Model							KNB065FDTH(C)						KNB073FGDH
Compressor															E2			KNB073FGDHC
					Output					W			500				550
					Current		1			A		3.24		3.74	4.34			4.34		4.84		4.34
Fan motor					Model										RA6V21-AB or BB or BD
					Current		1			A					0.24
		Dimensions W × H × D								mm					684 × 540 × 255
					Weight					kg							25
remarks	Dehumidification									/h		1.4		-	2.0			-		2.0		-
	Air flow			1						m3/h		1,812		1,788	1,800			1,776		1,800		1,776
	Sound level					1				dB(A)		46		47	47			48		47		48
	Fan speed									rpm		810		800	800			790		800		790
Special
	Fan speed regulator																	1
	Refrigerant filling capacity (R410A)									kg			0.73				0.75
	Refrigeration oil (Model)															NEO22
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.

5

Specifications and rating conditions of main electric parts

	Model	MUZ-HC25			MUZ-HC35VA- E2
		MUZ-HC35VA-	E1
Item					MUZ-HC35VAB- E2
		MUZ-HC35VAB- E1
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)			T20AL250V
	(F701, F801)			T3.15AL250V
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 mΩ 5 W
	(R825)			25 mΩ 5 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)			SHF-4-10W5
Outdoor fan motor thermal fuse		Open 152°C (RA6V21-AB) or Open 126°C (RA6V21-BB or BD)
IGBT	(TR821)			30 A 600 V

6

4 NOISE CRITERIA CURVES

MUZ-HC25VA

MUZ-HC35VA

FUNCTION SPL(dB(A))

LINE

					COOLING		46
					HEATING		47
BAR	90
0.0002 MICRO	80
	70								NC-70
dB re	60
LEVEL,
									NC-60
	50
PRESSURE
									NC-50
	40
									NC-40
SOUND
	30
BAND									NC-30
	20	APPROXIMATE
OCTAVE
		THRESHOLD OF
		HEARING FOR							NC-20
		CONTINUOUS
	10	NOISE
		63	125	250	500	1000	2000	4000	8000

BAND CENTER FREQUENCIES, Hz

MUZ-HC35VAB

FUNCTION SPL(dB(A))

LINE

					COOLING		47
					HEATING		48
BAR	90
0.0002 MICRO	80
	70								NC-70
dB re	60
LEVEL,
									NC-60
	50
PRESSURE
									NC-50
	40
									NC-40
SOUND
	30
BAND									NC-30
	20	APPROXIMATE
OCTAVE
		THRESHOLD OF
		HEARING FOR							NC-20
		CONTINUOUS
	10	NOISE
		63	125	250	500	1000	2000	4000	8000

BAND CENTER FREQUENCIES, Hz

FUNCTION	SPL(dB(A))	LINE
COOLING	47

					HEATING		48
BAR	90
0.0002 MICRO	80
	70								NC-70
dB re	60
LEVEL,
									NC-60
	50
PRESSURE
									NC-50
	40
									NC-40
SOUND
	30
BAND									NC-30
	20	APPROXIMATE
OCTAVE
		THRESHOLD OF
		HEARING FOR							NC-20
		CONTINUOUS
	10	NOISE
		63	125	250	500	1000	2000	4000	8000

BAND CENTER FREQUENCIES, Hz

Test conditions

Cooling : Dry-bulb temperature 35°C

Heating : Dry-bulb temperature 7°C Wet-bulb temperature 6°C

OUTDOOR UNIT

1m MICROPHONE

7

5 OUTLINES AND DIMENSIONS

MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB

Unit : mm

381.5 Air in

Air in

Air out

17.5

Drain hole

ø33

5.47

REQUIRED SPACE

100	mm
	or
	more

Basically open 100 mm or more without any obstruction in front and on both sides of the unit.

ormore mm 100

forpitch installation Bolt 280-264		more	350	mm	or
	300					more
		mm
		or
		100
40		Open two sides of left,
		right, or rear side.
5
.22		255
2 holes 10 × 16

20.8Service panel

540

Handle
			144.6	89.6
270	10
			61
		243	Service port		145.5
	105	500
		Bolt pitch for installation
		684

Liquid refrigerant pipe joint Refrigerant pipe (flared) ø6.35

40°

43°

Gas refrigerant pipe joint Refrigerant pipe (flared) ø9.52

8

6 WIRING DIAGRAM

MUZ-HC25VA MUZ-HC35VA- E1 MUZ-HC35VAB- E1

9

MUZ-HC35VA- E2 MUZ-HC35VAB- E2

10

7 REFRIGERANT SYSTEM DIAGRAM

	MUZ-HC25VA MUZ-HC35VA- E1 MUZ-HC35VAB- E1			Unit : mm
	Refrigerant pipe ø9.52	4-way valve
	(with heat insulator)	Muffler
		Stop valve
		(with service port)	Muffler	Outdoor
	Flared connection	Discharge		heat
		temperature		exchanger

thermistor RT62

Compressor

Defrost thermistor RT61

		Capillary tube			Strainer
		ø3.0 × ø1.4 × 450 (HC25)
Flared connection		ø3.0 × ø1.4 × 235 (HC35)				R.V. coil
		Check	Capillary tube
	Stop valve					heating ON
		valve
Refrigerant pipe ø6.35	(with strainer)		ø3.0 × ø1.4 × 800 (HC25)			cooling OFF
			ø3.0 × ø1.4 × 600 (HC35)
(with heat insulator)

Refrigerant flow in cooling

Refrigerant flow in heating

MUZ-HC35VA- E2 MUZ-HC35VAB- E2

Refrigerant pipe ø9.52	4-way valve
(with heat insulator)	Muffler
	Stop valve
	(with service port)	Discharge	Muffler	Outdoor
Flared connection				heat
		temperature		exchanger
		thermistor
		RT62	Compressor
				Defrost
				thermistor
				RT61
				Strainer
Flared connection				#100
	Capillary tube	LEV
	ø3.0 × ø2.0 × 260
	Stop valve			R.V. coil
				heating ON
Refrigerant pipe ø6.35	(with strainer)			cooling OFF

(with heat insulator)

Refrigerant flow in cooling Refrigerant flow in heating

11

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

	Refrigerant piping: m		Piping size O.D: mm
	Max. Length	Max. Height difference
	A	B	Gas	Liquid
MUZ-HC25VA
MUZ-HC35VA	10	5	9.52	6.35
MUZ-HC35VAB

Indoor unit

Max. Height difference B

Max. Length A

Outdoor unit

ADDITIONAL REFRIGERANT CHARGE (R410A : g)

Model	Outdoor unit			Refrigerant piping length (one way)
	precharged	5 m	6 m		7 m	8 m		9 m	10 m
MUZ-HC25VA		0	0		0	90		120	150
MUZ-HC35VA	1,150
MUZ-HC35VAB

Calculation: X g = 30 g/m (Refrigerant piping length (m) - 5) NOTE : Refrigerant piping exceeding 7 m requires additional refrigerant charge according to the calculation.

12

8 PERFORMANCE CURVES

MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB

The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions 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			} Cooling
(1)	Indoor intake air wet-bulb temperature :	°C WB
(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
(6)	Outdoor intake air wet-bulb temperature :	°C WB		Heating
(7)	Total input :	W

Indoor air wet/dry-bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.

How to measure the indoor air wet-bulb/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.

INDOOR UNIT

OUTDOOR UNIT

Wet and dry-bulb	Wet and dry-bulb
thermometers	thermometers

13

8-1. CAPACITY AND INPUT CURVES

Indoor air Wet-bulb temperature difference (degree)

7.9		9.8			10.8
7.3		9.0			9.9
6.7		8.3			9.1
6.1		7.5			8.2
5.5		6.8			7.4
5.0		6.1			6.7
4.4		5.4			5.9
MUZ-HC25VA at Rated frequency		MUZ-HC35VA at Rated frequency			MUZ-HC35VAB at Rated frequency

Cooling capacity

factor	1.5
	1.4
correction	1.3
	1.2		Indoor					26
	1.1			intake	air				24
Capacity						Wet-
	1.0					bulb	temperature			22
										20
	0.9							(°C)
										18
	18	20		25			30	35	40	43

Outdoor intake air Dry-bulb temperature (°C)

Indoor air Wet-bulb temperature difference (degree)

6.7			8.3		9.1
6.1			7.5		8.2
5.5			6.8		7.4
5.0			6.1		6.7
4.4			5.4		5.9
3.9			4.8		5.2
MUZ-HC25VA at Rated frequency			MUZ-HC35VA at Rated frequency		MUZ-HC35VAB at Rated frequency

	1.3			Total input (cooling)
factor
	1.2						26	24	22
correction	1.1
									20
	1.0								18
	0.9							(°C)
Input
	0.8						-bulbtemperature
					intake	air	Wet
				Indoor
	18	20	25	30			35	40	43

Outdoor intake air Dry-bulb temperature (°C)

Indoor air Wet-bulb temperature difference (degree)

20.522.4 22.4

18.920.7 20.7

17.419.0 19.0

15.817.2 17.2

14.215.5 15.5

12.613.8 13.8

11.012.1 12.1

9.5 10.3 10.3

MUZ-HC25VA at Rated frequency

MUZ-HC35VA at Rated frequency

MUZ-HC35VAB at Rated frequency

	(°C)
	ure
	mperat
	te
	-bulb
	Dry
	air
Indoor	intake

Outdoor intake air Wet-bulb temperature (°C)

		ure	(°C)
	-bulb	temperat
air	Dry
intake
Indoor

Outdoor intake air Wet-bulb temperature (°C)

NOTE: The above broken lines are for the heating operation without any frost and defrost operation.

14