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

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

(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

(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.

Fig. 2. Body Earth

Body earth

(Elimik conductive band)

Clip for connection with a

grounding wire

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

YES

5.0A

G4A

YES

450NR

YES

YES(IC)

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

5.20

17,740

1,500

11.79

6.9 - 6.3

6.80

23,200

1,790

12.68

8.2 - 7.5

MAX. 35m (TWO UNIT TOTAL)

CE (EMC&LVD)

RAM-52QH5

MODEL

PACKING

(mm)

cu.ft.

1,008

698

394

9.79

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

5.20

17,740

1,525

11.63

7.0 - 6.4

6.80

23,200

1,687

13.75

7.7 - 7.1

MAX. 45m (THREE UNIT TOTAL)

CE (EMC&LVD)

RAM-53QH5

MODEL

PACKING

(mm)

cu.ft.

1,008

698

394

9.79

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

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

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

1885

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

8.7 - 7.9

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.

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