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.