Hitachi RAM-71QH5 Service Manual

NO. 0459E

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

INDOOR UNIT + OUTDOOR UNIT

SEPTEMBER 2009

Refrigeration & Air-Conditioning Division

SERVICE MANUAL

REFER TO THE FOUNDATION MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

CONTENTS

SPECIFICATIONS ------------------------------------------------------------------- 5

FEATURES -------------------------------------------------------------------------- 17

HOW TO USE ---------------------------------------------------------------------- 21

INSTALLATION --------------------------------------------------------------------- 45

CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 49

MAIN PARTS COMPONENT --------------------------------------------------- 55

WIRING DIAGRAM ---------------------------------------------------------------- 61

CIRCUIT DIAGRAM --------------------------------------------------------------- 67

BLOCK DIAGRAM ----------------------------------------------------------------- 81

BASIC MODE ----------------------------------------------------------------------- 85

REFRIGERATING CYCLE DIAGRAM -------------------------------------- 109

DESCRIPTION OF MAIN CIRCUIT OPERATION ---------------------- 113

TROUBLE SHOOTING ---------------------------------------------------------- 136

SERVICE CALL Q & A --------------------------------------------------------- 185

DISASSEMBLY AND REASSEMBLY --------------------------------------- 201

PARTS LIST AND DIAGRAM ------------------------------------------------- 210

After installation

(W)

(A)

COOLING CAPACITY

DC INVERTER DUAL SYSTEM MULTI

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

TOTAL AMPERES

SPECIFICATIONS

RAM-71QH5

HEATING CAPACITY

DIMENSIONS (mm)

NET WEIGHT

1ø, 220 - 240V, 50Hz

(kg)

(kW)

(B.T.U.)

REFER TO THE SPECIFICATIONS PAGE

OUTDOOR UNIT

RAM-71QH5

850

800 298

SAFETY DURING REPAIR WORK

1. In order to disassemble and repair the unit in question, be sure to disconnect the power cord plug from the power outlet before starting the work.

2. If it is necessary to replace any parts, they should be replaced with respective genuine parts for the unit, and the replacement must be effected in correct manner according to the instructions in the Service Manual of the unit.

If the contacts of electrical parts are defective, replace the electrical parts without trying to repair them.

3. After completion of repairs, the initial state should be restored.

4. Lead wires should be connected and laid as in the initial state.

5. Modification of the unit by user himself should absolutely be prohibited.

6. Tools and measuring instruments for use in repairs or inspection should be accurately calibrated in advance.

7. In installing the unit having been repaired, be careful to prevent the occurence of any accident such as electrical shock, leak of current, or bodily injury due to the drop of any part.

8. To check the insulation of the unit, measure the insulation resistance between the power cord plug and grounding terminal of the unit. The insulation resistance should be 1M or more as measured by a 500V DC megger.

9. The initial location of installation such as window, floor or the other should be checked for being and safe enough to support the repaired unit again. If it is found not so strong and safe, the unit should be installed at the initial location reinforced or at a new location.

10. Any inflammable thing should never be placed about the location of installation.

11. Check the grounding to see whether it is proper or not, and if it is found improper, connect the grounding terminal to the earth.

DANGER

First, I must disconnect the power cord plug

from the power outlet.

– 1 –

– 2 –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

1. Scope The standards provide for items to be generally observed in carrying and handling semiconductors in relative manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned).

2. Object parts

(1) Micro computer (2) Integrated circuits (IC) (3) Field-effect transistors (FET) (4) P.C. boards or the like on which the parts mentioned in (1) and (2) of this paragraph are equipped.

3. Items to be observed in handling

(1) Use a conductive container for carrying and storing of parts. (Even rejected goods should be handled in

the same way).

Fig. 1. Conductive Container

(2) When any part is handled uncovered (in counting, packing and the like), the handling person must always

use himself as a body earth. (Make yourself a body earth by passing one M ohm earth resistance through a ring or bracelet).

(3) Be careful not to touch the parts with your clothing when you hold a part even if a body earth is being

taken.

(4) Be sure to place a part on a metal plate with grounding.

(5) Be careful not to fail to turn off power when you repair the printed circuit board. At the same time, try

to repair the printed circuit board on a grounded metal plate.

Fig. 2. Body Earth

Body earth (Elimik conductive band)

Clip for connection with a grounding wire

A conductive polyvinyl bag

Conductive sponge

– 3 –

(6) Use a three wire type soldering iron including a grounding wire.

Bare copper wire (for body earth)

Working table

Resistor of 1 M (1/2W)

Earth wire

Fig. 3. Grounding of the working table

Screw stop at the screwed part using a rag plate

Soldering iron

Grounding wire

Fig. 4. Grounding a soldering iron

Use a high insulation mode (100V, 10M or higher) when ordinary iron is to be used.

(7) In checking circuits for maintenance, inspection or some others, be careful not to have the test probes of the

measuring instrument shortcircuit a load circuit or the like.

Metal plate (of aluminium, stainless steel, etc.)

Staple

– 4 –

1. In quiet operation or stopping the operation, slight flowing noise of refrigerant in the refrigerating cycle is

heard occasionally, but this noise is not abnormal for the operation.

2. When it thunders near by, it is recommend to stop the operation and to disconnect the power cord plug

from the power outlet for safety.

3. The room air conditioner does not start automatically after recovery of the electric power failure for

preventing fuse blowing. Re-press START/STOP button after 3 minutes from when unit stopped.

4. If the room air conditioner is stopped by setting the temperature, or missoperation, and re-start in a moment,

there is occasion that the cooling and heating operation does not start for 3 minutes, it is not abnormal and this is the result of the operation of IC delay circuit. This IC delay circuit ensures that there is no danger of blowing fuse or damaging parts even if operation is restarted accidentally.

5. This room air conditioner should not be used at the cooling operation when the outside temperature is

below –10°C (14°F).

6. This room air conditioner (the reverse cycle) should not be used when the outside temperature is below

–15°C (5°F). If the reverse cycle is used under this condition, the outside heat exchanger will be frosted and its efficiency falls.

7. When the outside heat exchanger is frosted, the frost is melted by operating the hot gas system, it is not

trouble that at this time fan stops and the vapour may rise from the outside heat exchanger.

CAUTION

– 5 –

SPECIFICATIONS

MODEL

FAN MOTOR

FAN MOTOR CAPACITOR

FAN MOTOR PROTECTOR

COMPRESSOR

COMPRESSOR MOTOR CAPACITOR

OVERLOAD PROTECTOR

OVERHEAT PROTECTOR

FUSE (for MICROPROCESSOR)

POWER RELAY

POWER SWITCH

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

80 W

YES

5.0A

G4A

YES

450NR

YES

YES(IC)

2300g

WITHOUT REFRIGERANT BECAUSE

COUPLING IS FLARE TYPE.

UNIT

PIPES

REFRIGERANT CHARGING VOLUME (Refrigerant 410A)

RAM-71QH5

JU1015D2

MAX. 60m

In case the pipe length is more than 30m, add refrigerant R410 at 20gram per every meter exceeds.

– 6 –

SPECIFICATIONS FOR INDOOR UNITS COMBINATION

OPERATION SCOPE

TYPE

DC INVERTER QUADRUPLE SYSTEM MULTI COOLING AND HEATING

MODEL OUTDOOR UNIT

PHESE/VOLTAGE/FREQUENCY

CIRCUIT AMPERES TO CONNECT (A)

COOLING

(FOUR UNITS)

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

HEATING

(FOUR UNITS)

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

MAXIMUM LENGTH OF PIPING

STANDARD

RAM-71QH5

1ø, 220 - 240V, 50Hz

7.10 (2.40 - 8.80)

24,240 (8,190 - 30,030)

2,140 (460 - 3,200)

11.33

9.8 - 9.0

8.50 (2.80 - 9.50)

29,000 (9,560 - 32,420)

2,110 (480 - 3,120)

13.74

9.70 - 8.90

MAX. 60m (FOUR UNIT TOTAL)

CE (EMC&LVD)

RAM-71QH5

MODEL

PACKING

(mm)

cu.ft.

1,008

848

394

11.89

GROSS WEIGHT (kg)

6.35DX4/9.52DX3/12.70X1

FLARENUTSIZE (SMALL/LARGE)

INDOOR SUCTION

TEMPERATURE (˚C)

COOLING OPERATION SCOPE

OUTDOOR SUCTION

TEMPERATURE (˚C)

INDOOR SUCTION

HUMIDITY (%)

DEHUMIDIFYING

OPERATION

HEATING OPERATION

SCOPE

16 - 32 22 - 41 BELOW 80

16 - 32 22 - 42 BELOW 80

BELOW 27 –15 - 23 —

– 7 –

4 ROOM MULTI-SPLIT INVERTER TYPE RAC: RAM-71QH5 POSSIBLE COMBINATION TO OPERATE (SAME TIME OPERATION)

– 8 –

– 9 –

QUADRUPLE SYSTEM MULTI R.A.C.

RAM-71QH5

INDOOR UNITS COMBINATIONS TO BE ABLE TO INSTALL

Two, three or four indoor units can be installed with one outdoor unit. And total nominal cooling capacity should not be more than 11.0kW

Be sure to connect two or three indoor units to this outdoor unit. If not, condensed water may drop, resulting in trouble.

– 10 –

QUADRUPLE SYSTEM MULTI R.A.C.

RAM-71QH5

INDOOR UNITS COMBINATIONS TO BE ABLE TO INSTALL

POSSIBLE

COMBINATIONS

TO INSTALL

(kW)

CONNECTING POSITION ON

OUTDOOR UNIT

(VALVE DIAMETER) (mm)

No.1 No.2

SUITABLE ROOM SIZE

TO INSTALL

)

No.3

6.35/9.52D 6.35/9.52D 6.35/9.52D

TWO UNITS

THREE UNITS

1.8+1.8

1.8+2.5

1.8+3.5

1.8+5.0

1.8+6.0

2.5+2.5

2.5+3.5

2.5+5.0

2.5+6.0

3.5+3.5

3.5+5.0

3.5+6.0

5.0+5.0

5.0+6.0

1.8+1.8+1.8

1.8+1.8+2.5

1.8+1.8+3.5

1.8+1.8+5.0

1.8+1.8+6.0

1.8+2.5+2.5

1.8+2.5+3.5

1.8+2.5+5.0

1.8+2.5+6.0

1.8+3.5+3.5

1.8+3.5+5.0

2.5+2.5+2.5

2.5+2.5+3.5

2.5+2.5+5.0

2.5+2.5+6.0

2.5+3.5+3.5

2.5+3.5+5.0

3.5+3.5+3.5

1.8+1.8+1.8+1.8

1.8+1.8+1.8+2.5

1.8+1.8+1.8+3.5

1.8+1.8+1.8+5.0

1.8+1.8+2.5+2.5

1.8+1.8+2.5+3.5

1.8+1.8+3.5+3.5

1.8+2.5+2.5+2.5

1.8+2.5+2.5+3.5

2.5+2.5+2.5+2.5

2.5+2.5+2.5+3.5

(8 ~ 12) + (8 ~ 12) (8 ~ 12) + (11 ~ 17) (8 ~ 12) + (16 ~ 24) (8 ~ 12) + (23 ~ 34) (8 ~ 12) + (25 ~ 37)

(11 ~ 17) + (11 ~ 17) (11 ~ 17) + (16 ~ 24) (11 ~ 17) + (21 ~ 32) (10 ~ 14) + (23 ~ 34) (16 ~ 24) + (16 ~ 24) (13 ~ 20) + (19 ~ 29) (12 ~ 18) + (20 ~ 31) (16 ~ 24) + (16 ~ 24) (15 ~ 22) + (18 ~ 27)

(8 ~ 12) + (8 ~ 12) + (8 ~ 12) (8 ~ 12) + (8 ~ 12) + (11 ~ 17) (8 ~ 12) + (8 ~ 12) + (16 ~ 24) (7 ~ 10) + (7 ~ 10) + (19 ~ 28)

(6 ~ 9) + (6 ~ 9) + (20 ~ 30) (8 ~ 12) + (11 ~ 17) + (11 ~ 17) (8 ~ 11) + (10 ~ 16) + (15 ~ 22)

(6 ~ 10) + (9 ~ 13) + (17 ~ 26)

(6 ~ 9) + (8 ~ 12) + (19 ~ 29)

(6 ~ 10) + (13 ~ 20) + (13 ~ 20)

(6 ~ 9) + (11 ~ 17) + (16 ~ 24) (11 ~ 16) + (11 ~ 16) + (11 ~ 16) (10 ~ 14) + (10 ~ 14) + (13 ~ 20)

(8 ~ 12) + (8 ~ 12) + (16 ~ 24)

(7 ~ 11) + (7 ~ 11) + (18 ~ 27)

(9 ~ 13) + (12 ~ 18) + (12 ~ 18) (7 ~ 11) + (10 ~ 16) + (15 ~ 22)

(11 ~ 16) + (11 ~ 16) + (11 ~ 16)

(8 ~ 12) + (8 ~ 12) + (8 ~ 12) + (8 ~ 12) (7 ~ 11) + (7 ~ 11) + (7 ~ 11) + (10 ~ 16) (7 ~ 10) + (7 ~ 10) + (7 ~ 10) + (13 ~ 19)

(6 ~ 9) + (6 ~ 9) + (6 ~ 9) + (15 ~ 23)

(7 ~ 10) + (7 ~ 10) + (9 ~ 14) + (9 ~ 14)

(6 ~ 9) + (6 ~ 9) + (8 ~ 12) + (12 ~ 18) (5 ~ 8) + (5 ~ 8) + (11 ~ 16) + (11 ~ 16) (6 ~ 10) + (9 ~ 13) + (9 ~ 13) + (9 ~ 13) (6 ~ 9) + (8 ~ 12) + (8 ~ 12) + (11 ~ 16) (8 ~ 12) + (8 ~ 12) + (8 ~ 12) + (8 ~ 12)

(7 ~ 11) + (7 ~ 11) + (7 ~ 11) + (10 ~ 16)

1.8

2.5

3.5

2.5

3.5

1.8

2.5

3.5

2.5

3.5

1.8

2.5

1.8

2.5

3.5

2.5

3.5

2.5

3.5

1.8

2.5

3.5

2.5

2.5, 3.5, 4.0, 5.0 & 6.0 means indoor units cooling capacity class. (1) Marking

: needs flare adapter (9.52 ➝ 12.7D): Part No. TA261D-4 001 : needs flare adapter (12.7 ➝ 9.52D): Part No. TA261D-6 002

(2) Suitable room size is determined based on the conditions below:

• Climate is in the temperate zone like Tokyo, Japan.

• For usual residential use.

• Smaller figure is for light construction which means light thermally sealed.

• Larger figure is for heavy constructions, which means well thermally sealed.

No.4

6.35/12.7D

5.0

6.0

5.0

6.0

5.0

6.0

5.0

6.0

5.0

6.0

5.0

6.0

5.0

6.0

5.0

1.8

2.5

3.5

5.0

2.5

3.5

2.5

3.5

2.5

3.5

1.8

2.5

3.5

5.0

1.8

2.5

3.5

1.8

2.5

FOUR UNITS

  

      

– 11 –

– 12 –

– 13 –

– 14 –

– 15 –

Outdoor unit

Maximum 5m

Indoor unit

INSTALLATION

PIPE LENGTH (1) Total 60m maximum pipe length. (2) Pipe length for one indoor unit : maximum 25m.

To the outdoor unit, up to four indoor units can be connected until the total value of capacity to 11.0kW. Make sure to connect to two or more indoor units.

Indoor unit 3

Indoor unit 4Indoor unit 2

Indoor unit 1

Outdoor unit

Height

– 16 –

MODEL: RAM-71QH5

Flare adaptor for piping

The flare adaptor for piping is required depending on combination of indoor units.

•ø9.52 (3/8”) ➝ ø 12.7 (1/2”) Parts number TA261D-4 001

•ø12.7(1/2”) ➝ ø 9.52 (3/8”) Parts number TA261D-6 002

One unit of 1.8kW, 2.5kW,

3.5kW or 5.0kW

One unit of 1.8kW, 2.5kW, 3.5kW or 5.0kW (5kW unit: Optional flare adaptor for piping is necessary.)

One unit of 1.8kW, 2.5kW, 3.5kW, 5.0kW or

6.0kW (5kW, 6kW unit: Optional flare adaptor for piping is necessary.)

One unit of 1.8kW, 2.5kW, 3.5kW, 5.0kW or

6.0kW (2.5kW, 3.5kW unit: Optional flare adaptor for piping is necessary.)

Face this side (suction side) of the unit to the wall.

Remove side cover when connecting the piping and connecting cord.

Pull downward

– 17 –

– 18 –

RAM-71QH5

Grounding rod (optional) (Earth wire and grounding rod are not supplied. Please use optional items below.)

Earth line

Arrange power cord so they do not touch service valve.

CAUTION

– 19 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MODEL RAM-71QH5

Handle

Air suction grille

16874

26 850

957

800

788

1010

320

340

Air outlet

340

2022 298

211

Handle

Fixing hole

507 198

12 37

More than

100

More than

700

100

Service space

107.5

52 52

– 20 –

MAIN PARTS COMPONENT

FAN MOTOR

Fan Motor Specifications

CONNECTION

MODEL

POWER SOURCE

OUTPUT

BLU : BLUE YEL : YELLOW BRN : BROWN WHT : WHITE

GRY : GRAY ORN : ORANGE GRN : GREEN RED : RED

BLK : BLACK PNK : PINK VIO : VIOLET

DC : 350V

80W

RESISTANCE

VALUE

( )

20˚C

(68 ˚F)

˚C

(167 ˚F)

—

WHT

BLK

RED

YEL

BLU

(Control circuit built in)

350V

15V

0-6V

0-15V

RAM-71QH5

– 21 –

COMPRESSOR MOTOR

Compressor Motor Specifications

V/R (YELLOW)

W/S (RED)

U/C (WHITE)

MODEL

COMPRESSOR MODEL

PHASE SINGLE

RATED VOLTAGE AC 220 ~ 240 V

RATED FREQUENCY 50 Hz

POLE NUMBER 4

CONNECTION

20°C

(68°F)

75°C

(167°F)

( )

RESISTANCE VALUE

2M = 1.05

2M = 1.268

RAM-71QH5

JU1015D2

WHITE

YELLOW

RED

MODEL RAM-71QH5

WIRING DIAGRAM

– 23 –

GRY WHT

RED YEL BLK

ORN

GRY WHT RED YEL BLK ORN

GRY

WHT

RED

YEL

BLK

ORN

GRY

WHT

RED

YEL

BLK

ORN

CIRCUIT DIAGRAM

MODEL RAM-71QH5

– 25 –

– 27 –

BLOCK DIAGRAM

MODEL RAM-71QH5

Outdoor micro computer (AX-6V)

Magnetic relay

Inrush current

protection relay

Rotor position

detector

Overload current

detector

SPM driver

Overheat

thermistor

Defrost

thermistor

Outdoor temp

thermistor

Indoor/Outdoor

Interface 1

Indoor/Outdoor

Interface 2

Indoor/Outdoor

Interface 3

Switching power supply 3

Switching power supply 2

Reset circuit

Indoor/Outdoor

Interface 4

Clock circuit

Multiplexer

Expansion valve

thermistor 3

Expansion valve

thermistor 1

Expansion valve

thermistor 2

Expansion valve

thermistor 4

Expansion valve 1

Expansion valve 2

Expansion valve 3

Expansion valve

drive circuit

Expansion valve 4

Reversing valve

drive circuit

Reversing valve

EEPROM

Fan motor

drive circuit

compressor

fan motor

Indoor unit 1

Indoor unit 2

Indoor unit 3

C1/D1

C2/D2

C3/D3

Indoor unit 4

C4/D4

Power source

single phase 50Hz, 220-240V

Outdoor Unit

System

Power

Module

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Hitachi RAM-71QH5 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual