Hitachi RAM-52QH5 User 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.
L1L2
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.
L1L2L3
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. Connecting cord
Ø1.6 or 2.
Green-and-
Yellow
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-and-
Yellow
LN
Screw for ground,
earth screw
Terminal board
Green-and-Yellow
AC 220V~240V ONLY
LN
INDOOR 1
C1 D1 C2 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 C
1D1C2D2
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.
Green-and-
Yellow
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-and-
Yellow
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.
Connecting cord
Ø1.6 or 2.
Green-and-Yellow
Green-and-Yellow
AC 220V~240V ONLY
LN
INDOOR 1
C1 D1 C2 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 C
1D1C2D2C3D3
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.