Hitachi RAM-52QH5, RAM-53QH5 Service Manual

RAM-52QH5
RAM-53QH5

NO. 0428E

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

OUTDOOR UNIT

AUGUST 2008

Refrigeration & Air-Conditioning Division

SERVICE MANUAL

PM

REFER TO THE FOUNDATION MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

CONTENTS

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

INSTALLATION --------------------------------------------------------------------- 14

CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 21

MAIN PARTS COMPONENT --------------------------------------------------- 23

CAPACITY DIAGRAM ------------------------------------------------------------ 25

WIRING DIAGRAM ---------------------------------------------------------------- 33

CIRCUIT DIAGRAM --------------------------------------------------------------- 37

BLOCK DIAGRAM ----------------------------------------------------------------- 43

BASIC MODE ----------------------------------------------------------------------- 45

REFRIGERATING CYCLE DIAGRAM --------------------------------------- 71

DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 75

TROUBLE SHOOTING ---------------------------------------------------------- 106

DISASSEMBLY AND REASSEMBLY --------------------------------------- 113

PARTS LIST AND DIAGRAM ------------------------------------------------- 116

RAM-52QH5
RAM-53QH5

After installation

NOTE:

This manual describes only points that differ from RAF-25, 35,
50NH5, RAD-25, 35NH5, RAD-25, 35NH5 and RAM-80QH5
(TC No. 0771EF), RAI-25, 35NH5 (PM No. 0271E), RAI-50NH5
and RAC-50NH5 (PM No. 0274E), RAK-18, 25, 35NH5 (PM
No. 0269E), RAK-50NH5 and RAC-50NH5 (PM No. 0302E)
for items not described in this manual.

850

650

298

50

(W)

(A)

COOLING CAPACITY

DC INVERTER DUAL AND TRIPLE SYSTEM MULTI

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

TOTAL AMPERES

SPECIFICATIONS

OUTDOOR UNIT

RAM-52QH5

HEATING CAPACITY

DIMENSIONS (mm)

NET WEIGHT

1ø, 220 - 240V, 50Hz

W

H

D

(kg)

(kW)

(B.T.U.)

REFER TO THE SPECIFICATIONS PAGE

RAM-53QH5

– 1 –

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.

– 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.

1M

Fig. 2. Body Earth

Body earth
(Elimik conductive band)

Clip for connection with a
grounding wire

IC

A conductive polyvinyl bag

IC

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 running, 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 adjusting thermostat, 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 at heating operation when the outside

temperature is below –15°C (5°F). If the reverse cycle is used under this condition, the outside heat
exchanger is frosted and 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)

40 W

NO

NO

NO

YES

YES

5.0A

G4A

NO

NO

YES

NO

450NR

YES

YES(IC)

NO

1650g

WITHOUT REFRIGERANT BECAUSE

COUPLING IS FLARE TYPE.

UNIT

PIPES

REFRIGERANT CHARGING
VOLUME
(Refrigerant 410A)

RAM-52QH5

JU1013DA

MAX. 45m

RAM-53QH5
In case the pipe length is more than 35m, add refrigerant R410 at 20gram per every meter exceeds.

RAM-53QH5

RAM-52QH5
Additional charge of refrigerant is not required.

– 6 –

SPECIFICATIONS FOR INDOOR UNITS COMBINATION

OPERATION SCOPE

TYPE

DC INVERTER DUAL SYSTEM MULTI COOLING AND HEATING

MODEL OUTDOOR UNIT

PHESE/VOLTAGE/FREQUENCY

CIRCUIT AMPERES TO CONNECT (A)

COOLING

(TWO UNITS)

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

HEATING

(TWO 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-52QH5

1ø, 220 - 240V, 50Hz

16

5.20

17,740

1,500

11.79

6.9 - 6.3

99

6.80

23,200

1,790

12.68

8.2 - 7.5

99

MAX. 35m (TWO UNIT TOTAL)

CE (EMC&LVD)

RAM-52QH5

MODEL

W

PACKING

(mm)

H

D

cu.ft.

1,008

698

394

9.79

55

GROSS WEIGHT (kg)

6.35D/9.52DX2

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 –

SPECIFICATIONS FOR INDOOR UNITS COMBINATION

TYPE

DC INVERTER TRIPLE SYSTEM MULTI COOLING AND HEATING

MODEL OUTDOOR UNIT

PHESE/VOLTAGE/FREQUENCY

CIRCUIT AMPERES TO CONNECT (A)

COOLING

(THREE UNITS)

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

HEATING

(THREE 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-53QH5

1ø, 220 - 240V, 50Hz

16

5.20

17,740

1,525

11.63

7.0 - 6.4

99

6.80

23,200

1,687

13.75

7.7 - 7.1

99

MAX. 45m (THREE UNIT TOTAL)

CE (EMC&LVD)

RAM-53QH5

MODEL

W

PACKING

(mm)

H

D

cu.ft.

1,008

698

394

9.79

55

GROSS WEIGHT (kg)

6.35D/9.52DX3

FLARENUTSIZE (SMALL/LARGE)

OPERATION SCOPE

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

—

– 8 –

DUAL SYSTEM MULTI R.A.C.

RAM-52QH5

COOL / HEAT CAPACITY SPEC. FOR INDOOR UNITS
COMBINATIONS TO BE ABLE TO OPERATE SIMULTANEOUSLY

Whichever indoor units are installed, cooling and heating capacity depends on how many and which indoor units
are operating at that time.

RATING CONDITON (DRY BLUB / WET BULB)

COOLING

HEATING

INDOOR OUTDOOR

27 / 19 ˚C

20 / –˚C

35 / 24˚C

7 / 6˚C

ONE UNIT

TWO UNITS

POSSIBLE

COMBINATIONS

TO OPERATE

AMPERE

(A)

220-240V

CAPACITY RATING

(kW) (RANGE)

POWER

CONSUMPTION

(W)

ONE UNIT : The values indicated are only for one unit operation when two indoor units are connected.

OUTDOOR UNIT

COOLING

AMPERE

(A)

220-240V

CAPACITY RATING

(kW) (RANGE)

POWER

CONSUMPTION

(W)

OUTDOOR UNIT

HEATING

(Reference value)

1.8

2.5

3.5

5.0

1.8 + 1.8

1.8 + 2.5

1.8 + 3.5

1.8 + 5.0

2.5 + 2.5

2.5 + 3.5

3.5 + 3.5

2.5 + 5.0

3.5 + 5.0

1.80

2.50

3.50

5.00

1.80 + 1.80

1.76 + 2.44

1.70 + 3.30

1.38 + 3.82

2.50 + 2.50

2.17 + 3.03

2.60 + 2.60

1.73 + 3.47

2.14 + 3.06

495

700

1030

1510

1015

1167

1472

1540

1472

1525

1500

1500

1500

2.3 - 2.1

3.2 - 2.9

4.7 - 4.3

6.9 - 6.4

4.7 - 4.3

5.4 - 4.9

6.8 - 6.2

7.1 - 6.5

6.8 - 6.2

7.0 - 6.4

6.9 - 6.3

6.9 - 6.3

6.9 - 6.3

2.50

3.90

4.80

6.50

2.50 + 2.50

2.60 + 3.60

2.31 + 4.49

1.80 + 5.00

3.40 + 3.40

2.83 + 3.97

3.40 + 3.40

2.27 + 4.53

2.8 + 4.00

690

1060

1320

1800

1290

1650

1790

1790

1885

1790

1790

1790

1790

3.2 - 2.9

4.9 - 4.5

6.1 - 5.6

8.3 - 7.6

5.9 - 5.4

7.6 - 6.9

8.2 - 7.5

8.2 - 7.5

8.7 - 7.9

8.2 - 7.5

8.2 - 7.5

8.2 - 7.5

8.2 - 7.5

– 9 –

TRIPLE SYSTEM MULTI R.A.C.

RAM-53QH5

COOL / HEAT CAPACITY SPEC. FOR INDOOR UNITS
COMBINATIONS TO BE ABLE TO OPERATE SIMULTANEOUSLY

Whichever indoor units are installed, cooling and heating capacity depends on how many and which indoor units
are operating at that time.

RATING CONDITON (DRY BLUB / WET BULB)

COOLING

HEATING

INDOOR OUTDOOR

27 / 19 ˚C

20 / –˚C

35 / 24˚C

7 / 6˚C

(Reference value)

* ONE UNIT INDICATED ARE ONLY FOR ONE UNIT OPERATION WHEN TWO INDOOR UNITS ARE CONNECTED.

– 10 –

DUAL AND TRIPLE SYSTEM MULTI R.A.C.

RAM-52QH5 & RAM-53QH5

INDOOR UNITS COMBINATIONS TO BE ABLE TO INSTALL

Two or three indoor units can be installed with one outdoor unit.
And total nominal cooling capacity should not be more than 9.0kW

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

INDOOR UNIT

MODEL

NOMINAL
COOLING

CAPACITY

(kW)

CAPACITY (kW)

at one unit operation

SUITABLE ROOM SIZE (m2)

at one unit operation

COOLING HEATING COOLING HEATING

RAK-18NH5

RAK-18NH6

RAK-18NH6A

RAK-18QH8

RAK-25NH5

RAK-25NH6

RAK-25NH6A

RAK-25QH8

RAI-25NH5

RAI-25NH5A

RAF-25NH5

RAF-25QH8

RAD-25NH5

RAD-25NH7

RAD-25NH7A

RAK-35NH5

RAK-35NH6

RAK-35NH6A

RAK-35QH8

RAI-35NH5

RAI-35NH5A

RAF-35NH5

RAF-35QH8

RAD-35NH5

RAD-35NH7

RAD-35NH7A

RAK-50NH5

RAK-50NH6

RAK-50NH6A

RAK-50QH8

RAI-50NH5

RAI-50NH5A

RAF-50NH5

RAF-50QH8

RAD-50NH7

RAD-50NH7A

1.8kW

1.00 – 1.80

1.00 – 1.80

1.00 – 1.80

1.00 – 1.80

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 1.80

1.00 – 1.80

1.00 – 1.80

1.00 – 1.80

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 2.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 3.50

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

1.00 – 5.00

8 – 12

8 – 12

8 – 12

8 – 12

11 – 17

11 – 17

11 – 17

11 – 17

11 – 17

11 – 17

11 – 17

11 – 17

11 – 17

11 – 17

11 – 17

16 – 24

16 – 24

16 – 24

16 – 24

16 – 24

16 – 24

16 – 24

16 – 24

16 – 24

16 – 24

16 – 24

23 – 34

23 – 34

23 – 34

23 – 34

23 – 34

23 – 34

23 – 34

23 – 34

23 – 34

23 – 34

9 – 11

9 – 11

9 – 11

9 – 11

14 – 18

14 – 18

14 – 18

14 – 18

14 – 18

14 – 18

14 – 18

14 – 18

14 – 18

14 – 18

14 – 18

17 – 22

17 – 22

17 – 22

17 – 22

17 – 22

17 – 22

17 – 22

17 – 22

17 – 22

17 – 22

17 – 22

23 – 29

23 – 29

23 – 29

23 – 29

23 – 29

23 – 29

23 – 29

23 – 29

23 – 29

23 – 29

2.5kW

3.5kW

5.0kW

– 11 –

DUAL SYSTEM MULTI R.A.C.

RAM-52QH5

CONNECTING POSISION 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

(m2)

6.35/9.52D 6.35/9.52D

TWO UNITS

1.8+1.8

1.8+2.5

1.8+3.5

1.8+5.0

2.5+2.5

2.5+3.5

(8-12) + (8-12)

(8-12) + (10-16)

(7-9) + (15-22)

(6-9) + (18-27)

(12-15) + (12-15)

(11-14) + (14-18)

1.8

1.8

1.8

1.8

2.5

2.5

1.8

2.5

3.5

5.0

2.5

3.5

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

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

(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.

3.5+3.5 (13-16) + (13-16) 3.5 3.5

2.5+5.0 (10-12) + (18-20) 2.5 5.0





– 12 –

TRIPLE SYSTEM MULTI R.A.C.

RAM-53QH5

CONNECTING POSISION 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

(m2)

No.3

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

TWO UNITS

THREE UNITS

1.8+1.8+1.8

1.8+1.8+2.5

(8-12) + (8-12) + (8-12)

(8-12) + (8-12) + (11-17)

1.8

1.8

1.8

1.8

1.8

2.5

1.8+1.8

1.8+2.5

1.8+3.5

1.8+5.0

2.5+2.5

2.5+3.5

(8-12) + (8-12)

(8-12) + (10-16)

(7-9) + (15-22)

(6-9) + (18-27)

(12-15) + (12-15)

(11-14) + (14-18)

1.8

1.8

1.8

1.8

2.5

2.5

1.8

2.5

3.5

5.0

2.5

3.5

3.5+3.5 (13-16) + (13-16) 3.5 3.5

2.5+5.0 (10-12) + (18-20) 2.5 5.0





2.5, 3.5, 4.0, 5.0 means indoor units cooling capacity class.

(1) Marking

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

(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.

1.8+1.8+3.5 (7-11) + (7-11) + (14-21) 1.8 1.8 3.5

1.8+2.5+2.5 (7-11) + (10-15) + (10-15) 1.8 2.5 2.5

2.5+2.5+2.5 (10-11) + (10-11) + (10-11) 2.5 2.5 2.5

– 13 –

Indoor unit 1

Outdoor unit

Outdoor unit

Maximum 5m

Maximum –10m

Indoor unit

Indoor unit

Indoor unit 2

INSTALLATION

PIPE LENGTH
(1) Total 35m maximum pipe length.
(2) Pipe length for one indoor unit : maximum 25m.

HIGHT DIFFERENCE
(1) Hight : maximum ± 10m
(2) Hight difference between each indoor unit ≤ 5m.

L

1

L

2

To the outdoor unit, up to two indoor units can be connected until the total value of
capacity from 7.5kW.
Make sure to connect to two indoor units.

– 14 –

Indoor unit 1

Outdoor unit

Outdoor unit

Maximum 5m

Maximum –10m

Indoor unit

Indoor unit

Indoor unit

Indoor unit 2 Indoor unit 3

INSTALLATION

PIPE LENGTH
(1) Total 45m maximum pipe length.
(2) Pipe length for one indoor unit : maximum 25m.

HIGHT DIFFERENCE
(1) Hight : maximum ± 10m
(2) Hight difference between each indoor unit ≤ 5m.

L

1 L

2

L

3

To the outdoor unit, up to three indoor units can be connected until the total value of
capacity from 7.5kW.
Make sure to connect to two or three indoor units.

– 15 –

MODEL: RAM-52QH5

– 16 –

MODEL: RAM-53QH5

– 17 –

Above 100mm

Drain hole

Bushing

Outer diameter above 16mm

b

•

•

•

•

Condensed water disposal of outdoor unit

When Using and Installing in Cold Areas

There is holes on the base of outdoor unit for condensed water to exhaust.

To lead condensed water to the drain hole, place the outdoor unit on the mounting stand (optional) or on blocks to raise its
level more than 100mm from the ground surface. Connect the drain pipe as shown in the figure. Cover two other water
drain holes with the bushings included. (To insall a bushing, push in both ends of the bushing so that it aligns with the drain
hole.)

When connecting the drain pipe, make sure that the bushing does not lift off or deviate from the base.

1.

Remove flare nut from service valve.

4.

Perform air purge and gas leak inspection.

2.

Apply refrigerant oil to flare nut sections of servicevalve and pipings.

5.

Wrap the provided insulating material around sidepiping using vinyl tape.

3.

Match center of piping to large diameter side service valve and tank assembly, and tighten flarenut first by hand,
then securely tighten using torque wrench.

Install the outdoor unit on a stable, flat surface and check to see that the condensed water drains.

For more details, refer to the Installation Manual for Cold Areas.

When the air conditioner is used in low temperature and in snowy conditions, water from the heat exchanger may freeze
on the base surface to cause poor drainage. When using the air conditioner in such areas, do not install the bushings. Keep a
minimum of 250mm between the drain hole and the ground. When using the drain pipe, consult your sales agent.

Bushingb

Bushingb

Drain pipe

Drain hole

Push Push

a

– 18 –

Outdoor Unit

Wiring pattern

Indoor Unit

Fig. 1

Power cord

Screw

Insulating plate

Cord band

Connecting cord

CD

C1 D1

Indoor unit No. 1

Screw for ground, earth screw

Screw for ground, earth screw

For Indoor unit No. 1

Terminal board

Terminal board

Connecting cord
Ø1.6 or 2.0

Connecting cord
Ø1.6 or 2.0

Green-and­Yellow

CD

C2 D2

Indoor unit No. 2

Screw for ground, earth screw

Screw for ground, earth screw

For Indoor unit No. 2

Terminal board

Terminal board

Green-and­Yellow

LN

Screw for ground,
earth screw

Terminal board

Green-and-Yellow

AC 220V~240V ONLY

LN

INDOOR 1

C1D1C2 D2

INDOOR 2

Connection of the connecting cords and power cord. (Outdoor unit)
RAM-52QH5

WARNING

!

WARNING

!

WARNING

!

CAUTION

!

CAUTION

!

Connecting cord should be connected according to Fig.1, that the Indoor unit No. shall match with terminal board No.
of Outdoor unit.
Be sure to fix the connecting cord with the band as shown below. Otherwise water leakage causes short circuit or faults.

Bind connecting cords to
make them fit between the
convex sections.

Earth wire

Earth

Circuit breaker

LN C1D

1

C

2

D

2

Indoor unit 1 Indoor unit 2

Terminal indications

Grounding rod (optional)

Earth line and grounding rod are not supplied.
Please use optional items below.

•

•

•

•

•

•

•

( )

If earth line cannot be taken from
the power supply connection, use
the optional grounding rod to do
earthing.

Type of grounding rod

SP-EB-2

Length

900mm

Connection of the power cord and connecting
cord

Securely screw in the power cord
and connecting cord so that it will not
get loose or disconnect.

Tightening torque reference value:

1.2 to 1.6 N•m (12 to 16 kgf•cm)
Excessive tightening may damage
the interior of the cord requiring
replacement.

Power cord and
Connecting cord

To prevent a connection error, connecting cords
should be bundled and taped to each respective
pipe. If connecting cords are mixed with other indoor
units, a refrigeration cycle abnormality may occur,
causing dripping.

Leave some space in the connecting cord for maintenance purpose
and be sure to secure it with the cord band.

Secure the connecting cord along the coated part
of the wire using the cord band. Do not exert
pressure on the wire as this may cause
overheating or fire.

When putting two connecting cords through the band.

•

Hold the handle of the side cover, slide down and take off the corner hook, then pull. Reverse these steps when installing.

– 19 –

Screw for ground, earth screw

Outdoor Unit

Wiring pattern

Indoor Unit

Fig. 1

Power cord

Screw

Insulating plate

Cord band

Connecting cord

CD

C1 D1

Indoor unit No. 1

Screw for ground, earth screw

Screw for ground, earth screw

For Indoor unit No. 1

Terminal board

Terminal board

Connecting cord
Ø1.6 or 2.0

Green-and­Yellow

CD

C2 D2

Indoor unit No. 2

Screw for ground, earth screw

Screw for ground, earth screw

For Indoor unit No. 2

Terminal board

Terminal board

Green-and­Yellow

CD

C3 D3

LN

Indoor unit No. 3

Screw for ground, earth screw

Screw for ground,
earth screw

For Indoor unit No. 3

Terminal board

Terminal board

Terminal board

Connecting cord
Ø1.6 or 2.0

Connecting cord
Ø1.6 or 2.0

Green-and-Yellow

Green-and-Yellow

AC 220V~240V ONLY

LN

INDOOR 1

C1D1C2 D2

INDOOR 2

C3 D3

INDOOR 3

Connection of the connecting cords and power cord. (Outdoor unit)
RAM-53QH5

WARNING

!

WARNING

!

WARNING

!

CAUTION

!

CAUTION

!

Connecting cord should be connected according to Fig.1, that the Indoor unit No. shall match with terminal board No.
of Outdoor unit.
Be sure to fix the connecting cord with the band as shown below. Otherwise water leakage causes short circuit or faults.

Bind connecting cords to
make them fit between the
convex sections.

Earth wire

Earth

Circuit breaker

LN C1D

1

C

2

D

2

C

3

D

3

Indoor unit 1 Indoor unit 2 Indoor unit 3

Terminal indications

Grounding rod (optional)

Earth line and grounding rod are not supplied.
Please use optional items below.

•

•

•

•

•

•

•

( )

If earth line cannot be taken from
the power supply connection, use
the optional grounding rod to do
earthing.

Type of grounding rod

SP-EB-2

Length

900mm

Connection of the power cord and connecting
cord

Securely screw in the power cord
and connecting cord so that it will not
get loose or disconnect.

Tightening torque reference value:

1.2 to 1.6 N•m (12 to 16 kgf•cm)
Excessive tightening may damage
the interior of the cord requiring
replacement.

Power cord and
Connecting cord

To prevent a connection error, connecting cords
should be bundled and taped to each respective
pipe. If connecting cords are mixed with other indoor
units, a refrigeration cycle abnormality may occur,
causing dripping.

Leave some space in the connecting cord for maintenance purpose
and be sure to secure it with the cord band.

Secure the connecting cord along the coated part
of the wire using the cord band. Do not exert
pressure on the wire as this may cause
overheating or fire.

When putting two connecting cords through the band.

•

Hold the handle of the side cover, slide down and take off the corner hook, then pull. Reverse these steps when installing.

– 20 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MODEL RAM-52QH5

Handle

Air suction

grille

10464

26 850 79

22 20

Indoor unit 1
Service valve (ø6.35)

Indoor unit 2
Service valve (ø6.35)

Indoor unit 1
Service valve (ø9.52)

Indoor unit 2
Service valve (ø9.52)

298

340

Unit: mm

201

107.5 52 52 52

650

638

Air outlet

1010

10

320

340

Holes for anchor bolt

(2-ø12)

Fixing hole

507 198

57

12

37

Notch for anchor bolt

(2-ø12 Notchs)

More than

More than

More than

100

More than

700

100

100

Service space

ATTENTION

During service, before opening the side cover, please switch off power supply.

Note:

1. Insulated pipes should be used for both small and large diameter pipes.

2. Piping length should be within 25m for one room and within 35m in total.

3. Height difference of piping between indoor unit and outdoor unit should be within 10m.

4. Overhead clearance of outdoor unit should be 200mm to allow servicing.

5. For electrical connection, please refer to the installation manual.

– 21 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MODEL RAM-53QH5

Handle

Air suction

grille

10464

26 850 79

22 20

Indoor unit 1
Service valve (ø6.35)

Indoor unit 2
Service valve (ø6.35)

Indoor unit 3
Service valve (ø6.35)

Indoor unit 1
Service valve (ø9.52)

Indoor unit 2
Service valve (ø9.52)

Indoor unit 3
Service valve (ø9.52)

298

340

Unit: mm

201

107.5 52 52 52 52 52

650

638

Air outlet

1010

10

320

340

Holes for anchor bolt

(2-ø12)

Fixing hole

507 198

57

12

37

Notch for anchor bolt

(2-ø12 Notchs)

More than

More than

More than

100

More than

700

100

100

Service space

ATTENTION

During service, before opening the side cover, please switch off power supply.

Note:

1. Insulated pipes should be used for both small and large diameter pipes.

2. Piping length should be within 25m for one room and within 45m in total.

3. Height difference of piping between indoor unit and outdoor unit should be within 10m.

4. Overhead clearance of outdoor unit should be 200mm to allow servicing.

5. For electrical connection, please refer to the installation manual.

– 22 –

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

RAM-52QH5 / RAM-53QH5

DC : 140-330V

40W

RESISTANCE VALUE

( )

20˚C

(68˚F)

75˚C

(167˚F)

—

—

M

RED

BLK

WHT

YEL

BLU

(Control circuit built in)

140-330V

15V

0V

0-6V

0-15V

– 23 –

MODEL

COMPRESSOR MODEL

PHASE

RATED VOLTAGE

RATED FREQUENCY

POLE NUMBER

COMPRESSOR

Compressor Motor Specifications

CONNECTION

25°C

(68°F)

75°C

(167°F)

( )

RESISTANCE VALUE

2M = 1.063

2M = 1.268

RAM-52QH5 / RAM-53QH5

JU1013DA

SINGLE

DC: 280-330V

50Hz

4

(U)

(V)

(W)

M

M

M

WHITE

YELLOW

RED

WHITE

RED

YELLOW

– 24 –

7

6

RATING
CAPACITY

WHEN

TWO

COOLING CAPACITY ( ROOM TEMPERATURE 27˚C )

INDOOR

UNITS

OPERATE

5

5. 10

1060

1520

1740

1795

1920

5. 42

5. 55

5. 40

5. 00

4

3

2

1

0

3000

2000

1000

INPUT (W)

AMBIENT TEMP (˚C)

COOLING CAPACITY (kW)

0

20 25 30 35 40

45

CAPACITY DIAGRAM (RELATED TO THE AMBIENT TEMPERATURE)

MODEL : RAM-52QH5

– 25 –

RATING
CAPACITY

MAX CAPACITY

OUTDOOR UNIT

WITHOUT FROST

OUTDOOR UNIT

WITH FROST

WHEN

TWO

HEATING CAPACITY ( ROOM TEMPERATURE 20˚C )

INDOOR

UNITS

OPERATE

0. 0 0

7. 0˚C5. 5˚C–8. 5˚C

500

1000

2000

1500

2500

1. 0

2. 0

3. 0

4. 0

5. 0

6. 0

7. 0

8. 0

INPUT (W)

AMBIENT TEMP. (˚C)

HEATING CAPACITY (kW)

–15 –10 –50 51015

CAPACITY DIAGRAM (RELATED TO THE AMBIENT TEMPERATURE)

MODEL : RAM-52QH5

– 26 –

7

6

RATING
CAPACITY

WHEN

THREE

COOLING CAPACITY ( ROOM TEMPERATURE 27˚C )

INDOOR

UNITS

OPERATE

5

4

3

2

1

0

3000

2000

1000

INPUT (W)

AMBIENT TEMP (˚C)

COOLING CAPACITY (kW)

0

20 25 30 35 40

45

5. 95

1240

1765

2030

2095

2240

6. 32

6. 50

6. 30

5. 85

CAPACITY DIAGRAM (RELATED TO THE AMBIENT TEMPERATURE)

MODEL : RAM-53QH5

– 27 –

RATING
CAPACITY

MAX CAPACITY

OUTDOOR UNIT

WITHOUT FROST

OUTDOOR UNIT

WITH FROST

WHEN

THREE

HEATING CAPACITY ( ROOM TEMPERATURE 20˚C )

INDOOR

UNITS

OPERATE

0. 0

0

7. 0˚C5. 5˚C

–8. 5˚C

500

1000

2000

1500

2500

1. 0

2. 0

3. 0

4. 0

5. 0

6. 0

7. 0

8. 0

INPUT (W)

AMBIENT TEMP. (˚C)

HEATING CAPACITY (kW)

–15 –10 –50 51015

CAPACITY DIAGRAM (RELATED TO THE AMBIENT TEMPERATURE)

MODEL : RAM-53QH5

– 28 –

CAPACITY DIAGRAM (RELATED TO THE PIPING LENGTH)

MODEL : RAM-52QH5

1. 0

0. 9

0. 8

0. 7

0. 6
0 5 10 20 3025 3515

PIPING LENGTH (m)

CHANGE RATIO OF

CAPACITY

HEATING

1. 0

0. 9

0. 8

0. 7

0. 6
0 5 10 20 3025 3515

PIPING LENGTH (m)

CHANGE RATIO OF

CAPACITY

COOLING

– 29 –

CAPACITY DIAGRAM (RELATED TO THE PIPING LENGTH)

MODEL : RAM-53QH5