Mitsubishi PUH-1.6VKA2, PUH-2VKA2, PUH-2.5VKA2, PUH-3VKA2, PUH-3YKA2 Service Manual

1997

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

No.OC128

TECHNICAL & SERVICE MANUAL

Outdoor unit
[model names]	[Service Ref.]
PUH-1.6VKA	PUH-1.6VKA2
PUH-2VKA	PUH-2VKA2
PUH-2.5VKA	PUH-2.5VKA2
PUH-3VKA	PUH-3VKA2
PUH-3YKA	PUH-3YKA2
PUH-4YKSA	PUH-4YKSA3
PUH-5YKSA	PUH-5YKSA3
PUH-6YKSA	PUH-6YKSA2

CONTENTS

1. COMBINATION OF INDOOR AND OUTDOOR UNITS ·····2

2. PART NAMES AND FUNCTIONS·····················3

3. DATA··················································· ···············4

4. OUTLINES AND DIMENSIONS ························5

5. WIRING DIAGRAM ···········································9

6. REFRIGERANT SYSTEM DIAGRAM················16

7. DISASSEMBLY PROCEDURE ·······················17

8. PARTS LIST ··················································· ·19

9. OPTIONAL PARTS ··························Back cover

OUTDOOR UNIT

PUH-3K

The Slim Line.

From Mitsubishi Electric.

1 COMBINATION OF INDOOR AND OUTDOOR UNITS

	Indoor unit					Outdoor unit
	Service Ref.	Service	1.6	2	2.5		3	4	5	6
		Manual No.	VKA2	VKA2	VKA2	VKA2	YKA2	YKSA3	YKSA3	YKSA3
	PLH-GKH(S)B1
		OC139	—	—	—
	PLH-KKHC	OC123				—	—	—	—	—
	PCH-GKH(S)A1	OC135	—
	PEH-EKH(S)A2.TH	OC153	—	—
	PKH-FKH(S)A3	OC130							—	—
	PSH-GJH(S)A1	OC142	—	—	—

2

2 PART NAMES AND FUNCTIONS

Air outlet

(Expels warm air during cooling)

Air intake

Air intake

PUH-1.6VKA2

PUH-2VKA2

Air outlet

Air intake

Air intake

PUH-4YKSA3

Air outlet

PUH-2.5VKA2

PUH-3YKA2

PUH-3VKA2

Air outlet

PUH-5YKSA3

PUH-6YKSA2

CHARGELESS SYSTEM

PRE-CHARGED REFRIGERANT IS SUPPLIED FOR MAXIMUM PIPING LENGTH AT SHIPMENT.

The unique refrigerant circuit and a large accumulator always control the optimal refrigerant level regardless of the length (30m max. and 5m min.) of piping. The additional refrigerant charging work during installation often causes problems. Heretofore it is completely eliminated. This unique system improves the quality and reliability of the work done. It also helps to speed up the installation time.

3

3			DATA
1. REFILLING REFRIGERANT CHARGE (R-22 : kg)
Service Ref.																Refrigerant piping length (one way)
								5m		10m			15m			20m		25m		30m			35m			40m		45m	50m
PUH-1.6VKA								1.5		1.7			1.8			1.9	2.1			2.2			2.3			2.4		—	—
			2
PUH-2VKA2								1.5		1.7			1.8			1.9	2.1			2.2			2.3			2.4		—	—
PUH-2.5VKA								2.1		2.3			2.4			2.5	2.7			2.8			2.9			3.0		3.1	3.3
			2
PUH-3VKA2								2.5		2.7			2.8			2.9	3.1			3.2			3.3			3.4		3.6	3.7
PUH-3YKA2								2.5		2.7			2.8			2.9	3.1			3.2			3.3			3.4		3.6	3.7
PUH-4YKSA								3.5		3.6			3.8			3.9	4.1			4.2			4.4			4.5		4.6	4.8
			3
PUH-5YKSA								4.7		4.8			5.0			5.1	5.3			5.4			5.6			5.7		5.9	6.0
			3
PUH-6YKSA								4.3		4.4			4.6			4.7	4.9			5.0			5.2			5.3		5.5	5.6
			2
2. COMPRESSOR TECHNICAL DATA																										at 20˚C
Compressor Model								RH247VFC			NH38VMD				NH41VMD			NH52VND			NH52YDA				NH56YDA
					U-V			2.00			1.05				1.03			0.83				3.60			3.50
Winding					(R-C)
					U-W
Resistance								4.55			2.23				2.22			2.03				3.60			3.50
					(S-C)
(Ω )
					W-V			—				—				—		—				3.60			3.50
																		at 25˚C
Compressor Model								ZR61K3TFD								ZR68KCTFD
Winding					T1-T2			2.53-2.91							2.31
Resistance				T2-T3				2.53-2.91							2.31
(Ω )
					T3-T1			2.53-2.91							2.31

4

								Outdoor Unit-Necessary surrounding clearance			6VKAPUH.1-
Outdoor Unit-Necessary surrounding clearance			185		185					200
(Concentrated installation)		The upper side must be open.	(7-9/32)	500(19-11/16)	(7-9/32)	330(13)17	1/4)-362(14	10	Note:Allow adequate		22VKA-/PUH2
		200			27.539.5				500	150
				Air intake				10	10	upper clearance
									Front opening
			Air intake
100	10

For 10 units or less	1000	Air outlet	15		500		Service space

Handle
for moving		7 295(11-5/8) 24(1)
			Outlet guide
			installation hole
	Rear fresh
	air intake	Handle for moving
	Side air intake		524
138			339
			77
95	23	33	40
	Rear piping hole

Drain hole

5

870(34-1/4)

302

524

2-12 23 Oval holes (standard bolt M10)

Drain hole

Terminal block for indoor and outdoor unit connection

Terminal block for power line

Ground terminal

Handle for moving

Service panel
			5/8)-	connection
				Refrigerant-pipe flared
			(25	[15.88 3/8F
282	297	444	650	[9.52 3/8F		45
				Refrigerant-pipe flared
				connection
60			Knock out hole		60	53
						Knock out holes for
			for front piping
			(refrigerant,drainage		120 power line 2-[27
			and wiring)

104

	33					42	45

Bottom piping hole

2-U-shaped notched holes

Knock out hole
for right piping
(refrigerant,drainage
and wiring)	R
	20

R6
17	65

R20

80	25 max.

Standard bolt length

12					Front right piping holes-
					detail figures

(inch) mm : Unit

DIMENSIONS AND OUTLINES 4

6

Outdoor Unit-Necessary surrounding clearance

(Concentrated installation) The upper side must be open.

100	200
	10

For 10 units or less

1000

Air intake

185	185
(7-9/32) 500(19-11/16)	(7-9/32)

Air intake

Air outlet

17
39.5 27.5		330(13)	362(14-1/4)
15

Outdoor Unit-Necessary surrounding clearance

200

Note:Allow adequate 10 10 upper clearance

Front opening

500	150
10
Service space
500

23YKA-/PUH23VKA-PUH

25VKA.2-PUH

Handle for moving

138

95

	7 295(11-5/8) 24(1)
	Outlet guide
Side air intake	installation hole
Rear fresh
air intake	Handle for moving
		524
	441
		179
23	33	40

Rear piping hole

Drain hole

870(34-1/4)

302

403

524

2-12 23 Oval holes (standard bolt M10)

Drain hole

Terminal block for indoor and outdoor unit connection

Terminal block for power line

Ground
terminal
Handle for moving
Service panel
		553	850(33-7/16) Refrigerant-pipe flared
337	352		connection [15.88 5/8F			45
			Refrigerant-pipe flared
			connection [9.52 3/8F
60			Knock out hole		60	53
						Knock out holes for
			for front piping
					120
			(refrigerant,drainage			power line 2-[27
			and wiring)
104			Knock out hole
33	42	45
			for right piping
			(refrigerant,drainage		R20
			and wiring)	R
Bottom				20
					80	max.25
piping hole

2-U-shaped

R6

Standard bolt length

notched

65

holes

17

12

Front right piping holes-

detail figures

(inch) mm : Unit

Outdoor Unit-Necessary surrounding clearance	Outdoor Unit-Necessary surrounding clearance
(Concentrated installation)	300
The upper side must be open.

						185		185				Note:Allow adequate
						(7-9/32)	500(19-11/16)	(7-9/32)
									17	10	10	upper clearance
							Air intake
											Front opening
								39.527.5	330(13)	362(14-1/4)		100
	For 10 units or less	1000									500
150	10	300
					Air intake
										Terminal block for	10
										indoor and outdoor
						Air outlet					Service space
									15	unit connection
							870(34-1/4)				500
		7	295(11-5/8)	24(1)
					Outlet guide	302				Terminal block for power line
					installation hole

	Side air intake			Service panel
Handle			524	Ground
				terminal
for moving
				Handle
		585				1/2)-
				for moving
						1258(49
	Rear fresh		61		959
	air intake	Handle for moving
			524			Refrigerant-pipe flared
		345		382	403	connection [19.05 3/4F	45
138			83			Refrigerant-pipe flared
						connection [9.52 3/8F

95

Rear piping hole

23

33

40 524

2-12 23 Oval holes (standard bolt M10)

Drain hole

Drain hole

	60			Knock out hole
				for front piping
	104			(refrigerant,drainage
				and wiring)
	39	52	57
				Knock out hole
				for right piping

Bottom

(refrigerant,

piping hole

drainage and wiring)

	2-U-shaped	R6
	notched	17
	holes

	60	53
		Knock out holes for
	120
		power line 2-[27

R	R20
20

80	25 max.

Standard bolt length

65

12						Front right piping holes-
						detail figures

7

34YKSA-PUH

(inch) mm : Unit

8

Outdoor Unit-Necessary surrounding clearance (Concentrated installation)

The upper side must be open.

150	300
	10

Air intake

For 10 units or less

1000

7 345(13-9/16) 24(1)

Outlet guide installation hole

	Side air intake
Handle			524
for moving
	Rear fresh	585	61
	air intake	Handle for moving
		345	524
138			83
95	23	33	90
	Rear piping hole
		Drain hole

							Outdoor Unit-Necessary surrounding clearance
											300
185			185							Note:Allow adequate
(7-9/32)	600(23-5/8)	(7-9/32)
				17			10			10	upper clearance
	Air intake
									Front opening
			39.5 27.5	380(14-31/32)		412(16-1/4)				500	150
						Terminal block for		10
						indoor and outdoor
Air outlet										Service space
				15		unit connection
	970(38-3/16)									500
						Terminal block for power line
352
			Service panel
			Ground
			terminal
			Handle				1/2)
			for moving
						959	1258(49-
							Refrigerant-pipe flared
			382		403		connection [19.05 3/4F				45
							Refrigerant-pipe flared
							connection [9.52 3/8F
	524		60				Knock out hole			60	53
											Knock out holes for
							for front piping
										120
2-12 23 Oval holes			104				(refrigerant,drainage				power line 2-[27
							and wiring)
(standard bolt M10)
			39	52		57
							Knock out hole
							for right piping			R20
							(refrigerant,		R
			Bottom						20
							drainage and wiring)
										80	max.25
			piping hole
Drain hole			2-U-shaped				R6				Standard bolt length
			notched
										65
			holes				17
							12		Front right piping holes-
									detail figures

26YKSA-/PUH35YKSA-PUH

(inch) mm : Unit

5			WIRING DIAGRAM
PUH-1.6VKA2
SYMBOL			NAME	SYMBOL	NAME	SYMBOL	NAME
HC			CRANKCASE HEATER	MC	COMPRESSOR (INNER THERMOSTAT)	X12<O.B>	COMPRESSOR RELAY
C1			OUTDOOR FAN CAPACITOR	MF	OUTDOOR FAN MOTOR (INNER THERMOSTAT)	X13<O.B>	21S4 RELAY
C2			COMPRESSOR CAPACITOR	O.B	OUTDOOR CONTROLLER BOARD	X14<O.B>	21R RELAY
FC<O.B>			FAN CONTROLLER	SW1·2·3<O.B>	CHECK,SERVICE SELECTOR	ZNR<O.B>	VARISTER
F<O.B>			FUSE(6A)	T	TRANSFORMER	52C	CONTACTOR
21S4			R.V.COIL	TB1,3	TERMINAL BLOCK	63H1	HIGH PRESSURE SWITCH
21R			B.V.COIL	RT	OUTDOOR COIL THERMISTOR
					(0˚C/15kΩ ,25˚C/5.4kΩ )
LD1~LD8			CHECK,SERVICE LED	X11<O.B>	HC RELAY

		1	YLW	LED
	FROOM INDOOR UNIT			RT
		2	ORN
	CONNECTING WIRES
		3	BRN
	12V DC (polar)			O.B
		TB3

SW1

4 3 2 1

SW2

LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

CN2

14

13

12

11

CN4

S

SW2 OFF

63H1

2 1 ON

14

13

12

11

3

2 CN3

1

CN4T

4

F

4 3 2 1

TRF

21S4

52C

CH

ZNR R/1 S/2 T/3

SV

BRN BRN

63H1YLWYLW

YLW

RED RED

WHT WHT

RED RED

GRY GRY

GRY WHT WHT

S

BLU BLU

YLW

21

GRY

A

RED

21R

52C

HC

BRN 12.3V AC

220V

S4

B

ORN

RED 12.3V AC

YLW

230V

T

240V

RED

TB1

BLK

52C

POWER SUPPLY

L

RED

R

U

BLU

R

WHT

~/N(1phase)

N

BLK

T

W

C

MC

BLU

RED

220-240V 50Hz

GRY/YLW

C2

S

Main functions of LED (when both Nos. 1 and 2 of SW3 are ”OFF”)

LED No.	Output display	(	light	)	Check display	(	flash	)
LD1	Compressor ON command from indoor				—
LD2	Heating indoor command				—
LD3	63H1		ON		RT short/open
LD4	Compressor		ON		—
LD5	Outdoor fan		ON		—
LD6	4-way valve		ON		26C functions
LD7	Bypass valve		ON		RT overheat protection
LD8	Crankcase heater		ON		Defective input

FC

26C

MF2

63H2

MF1

51CM

BLU

BLU WHT

BLU 4

WHT 3

MF RED 2 RED ORNC1 1 ORN

NOTE : If the operation stops and the protection device is functioning, the check display will flash.

How to use SW1 and 2

●Pressing SW1 erases the past check contents loaded on the microcomputer.

●The output display (light) remains lit during operation, but pressing SW2 displays the past check contents by a flashing mode. Pressing the switch again returns it to output display (light).

CAUTION FOR SERVICING

							fig. 1 White connector
●The connector marked							s turns the compressor ON and OFF during servicing.

The compressor stops when the white connector is disconnected. See fig.1.

fig. 2 When power supply is 220V

RED 220V WHITE ORANGE 230V YELLOW 240V

CAUTIONS FOR POWER SUPPLY WIRING

●Since LD8 lights when normal power is turned ”ON”, check the power supply with the ON or OFF LD8.

Since the indoor transformer (T) is connected with 240V power, using 220V or 230V power will require a wiring connection change. See fig.2.

CAUTION FOR INDOOR AND OUTDOOR CONNECTING WIRES

●Since the indoor and outdoor connecting wires have polarity, be sure to connect the same terminal numbers (1,2,3) for the indoor and outdoor units.

9

PUH-2VKA2/PUH-2.5VKA2

SYMBOL	NAME	SYMBOL	NAME	SYMBOL	NAME
CN3(O.B)	CONNECTING WIRES	MC	COMPRESSOR (INNER THERMOSTAT)	X12(O.B)	MC RELAY
	INDOOR/OUTDOOR CONNECTOR	MF	OUTDOOR FAN MOTOR (INNER THERMOSTAT)	X13(O.B)	21S4 RELAY
CN4T(O.B)	TRANSFORMER CONNECTOR	O.B	OUTDOOR CONTROLLER BOARD	X14(O.B)	21R RELAY
HC	CRANKCASE HEATER	21R	BYPASS VALVE SOLENOID COIL	ZNR(O.B)	SURGE ABSORBER
C1	OUTDOOR FAN CAPACITOR	( )	CHECK,SERVICE SELECT SWITCH	21S4	4-WAY VALVE SOLENOID COIL
		SW1·2·3O.B
C2	COMPRESSOR CAPACITOR	T	TRANSFORMER	52C	CONTACTOR
FC(O.B)	FAN CONTROLLER	TB1,3	TERMINAL BLOCK	63H1	HIGH PRESSURE SWITCH
F(O.B)	FUSE(6,3A)	RT	OUTDOOR COIL THERMISTOR
LD1-LD8	CHECK,SERVICE LED	X11(O.B)	HC RELAY

TO INDOOR UNIT

1

YLW

LED

RT

2

ORN

O.B.

CONNECTING WIRES

3

BRN

SW1

DC 12V

TB3

4

3

2

1

SW2

LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

SW3

CN4

CN2

14

13

12

11

OFF

21 ON

3

CN3

2

14

13

12

11

26C

F.C.

1

MF2

CN4T

63H1

51CM

MF1

4 3 2 1

4

TRF

21S4

52C

CH ZNR FR S

T

S

RED

SV

BRN

RED RED

RED

RED

GRY

GRY

WHT WHT

BRN BRN

YLW

YLW

YLW YLW

BLU

BLU

WHT

RED

BRN

A1

BLUBLU

3 WHT

21

63H1

AC

21R

52C

HC

4 BLU

RED

12.3V

220V

S4

A2

RED

2 RED

MF

ORN

WHT

C1

ORN

230V

ORN 1

AC12.3V

YLW

WHT

T

240V

POWER SUPPLY

RED

BLU

~/N

220-240V 50Hz

L TB1

RED

L1/1

T1/2

BLU

R

N

BLU

L3/5

WHT

C

MC

52CT3/6

BLU

RED

S

GRN/YLW

C2

CAUTIONS FOR POWER SUPPLY WIRING

●Since LD8 lights when normal power is turned “ON”, check the power supply with the ON or OFF LD8.Since the transformer (T) is connected with 240V power, if 220V or 230V power is used, change the

wiring connection in the following procedure

CAUTION FOR INDOOR AND OUTDOOR CONNECTING WIRES

When power supply is 220V

RED	220V					WHITE
ORANGE
	230V
YELLOW
	240V

●Since the indoor and outdoor connecting wires has polarity, make sure to connect the same terminal numbers (1,2,3) for indoor and outdoor units.

Main functions of LED

	(	when both Nos.1 and 2 of				SW3		)
								are “OFF”
LED No.	Output display		(	light	)		(		flash	)
								Check display
LD1	Compressor indoor command							—
LD2	Heating indoor command							—
LD3	63H1			ON			Outdoor coil thermistor short/open
LD4	Compressor			ON				—
LD5	Outdoor fan			ON				—
LD6	4-way valve			ON			26C functions
LD7	Bypass valve			ON			RT overheat protection
LD8	Crankcase heater			ON			Defective input

NOTE :

If the operation stops to function of the protection device, the check display flashes.

How to use SW1 and 2

●Pressing SW1 erases the past check contents loaded on the microcomputer. ●The output display (light) remains during operation but pressing SW2 displays the

past check contents in flushing mode.

Pressing the switch again returns to output display (light).

10

PUH-3VKA2

SYMBOL	NAME	SYMBOL		NAME	SYMBOL	NAME
CN3(O.B)	CONNECTING WIRES	MC		COMPRESSOR (INNER THERMOSTAT)	X12(O.B)	MC RELAY
	INDOOR/OUTDOOR CONNECTOR	MF		OUTDOOR FAN MOTOR (INNER THERMOSTAT)	X13(O.B)	21S4 RELAY
CN4T(O.B)	TRANSFORMER CONNECTOR	O.B		OUTDOOR CONTROLLER BOARD	X14(O.B)	21R RELAY
HC	CRANKCASE HEATER	21R		BYPASS VALVE SOLENOID COIL	ZNR(O.B)	SURGE ABSORBER
C1	OUTDOOR FAN CAPACITOR	(	)	CHECK,SERVICE SELECT SWITCH	21S4	4-WAY VALVE SOLENOID COIL
		SW1·2·3O.B
C2	COMPRESSOR CAPACITOR	T		TRANSFORMER	52C	CONTACTOR
FC(O.B)	FAN CONTROLLER	TB1,3		TERMINAL BLOCK	63H1	HIGH PRESSURE SWITCH
F(O.B)	FUSE(6,3A)	RT		OUTDOOR COIL THERMISTOR
LD1-LD8	CHECK,SERVICE LED	X11(O.B)		HC RELAY

TO INDOOR UNIT

1

YLW

LED

RT

2

ORN

O.B.

CONNECTING WIRES

3

BRN

SW1

DC 12V

TB3

4

3

2

1

SW2

LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

SW3

CN4

CN2

14

13

12

11

OFF

21 ON

3

CN3

2

14

13

12

11

26C

F.C.

1

MF2

CN4T

63H1

51CM

MF1

4 3 2 1

4

TRF

21S4

52C

CH ZNR FR S

T

S

RED

SV

BRN

RED RED

RED

RED

GRY

GRY

WHT WHT

BRN BRN

YLW

YLW

YLW YLW

BLU

BLU

WHT

RED

BRN

A1

BLUBLU

3 WHT

21

63H1

AC

21R

52C

HC

4 BLU

RED

12.3V

220V

S4

A2

RED

2 RED

MF

ORN

WHT

C1

ORN

230V

ORN 1

AC12.3V

YLW

WHT

T

240V

POWER SUPPLY

RED

BLU

~/N

220-240V 50Hz

L TB1

RED

L1/1

T1/2

BLU

R

N

BLU

L3/5

WHT

C

MC

52CT3/6

BLU

RED

S

GRN/YLW

C2

Main functions of LED (when both Nos.1 and 2 of

SW3

are ”OFF” )

How to use SW1 and 2

●Pressing

erases the past check contents loaded on the

(

)

(

)

SW1

LED No.

Output display

light

Check display

flash

microcomputer.

LD1

Compressor indoor command

—

●The output display (light) remains lit during operation but

LD2

Heating indoor command

—

pressing

SW2

displays the past check contents in flashing

LD3

63H1

ON

Outdoor coil thermistor short/open

mode. Pressing the switch again returns to output display

LD4

Compressor

ON

—

(light).

LD5

Outdoor fan

ON

—

LD6

4-way valve

ON

—

LD7

Bypass valve

ON

RT overheat protection

LD8

Crankcase heater

ON

Defective input

NOTE : If the operation stops to function of the protection device, the check display flashes.

CAUTIONS FOR POWER SUPPLY WIRING

●Since LD8 lights when normal power is furned ”ON”, check the power supply with the ON or OFF LD8.Since the transformer (T) is connected with 240V power, if 220V or 230V power is used,

change the wiring connection in the following procedure.

CAUTION FOR INDOOR AND OUTDOOR CONNECTING WIRES

When power supply is 220V

RED	220V					WHITE
ORANGE
	230V
YELLOW
	240V

●Since the indoor and outdoor connecting wires has polarity, make sure to connect the same terminal numbers (1,2,3) for indoor and outdoor units.

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