Hitachi RAM-70NP4B User manual

RAM-70NP4B

NO. 0585E

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

OUTDOOR UNIT

JANUARY 2015

Refrigeration & Air-Conditioning Division

SERVICE MANUAL

REFER TO THE FOUNDATION MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

CONTENTS

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

FEATURES---------------------------------------------------------------------------- 11

INSTALLATION----------------------------------------------------------------------- 15

CONSTRUCTION AND DIMENSIONAL DIAGRAM ----------------------- 19

MAIN PARTS COMPONENT ---------------------------------------------------- 20

WIRING DIAGRAM ----------------------------------------------------------------- 23

CIRCUIT DIAGRAM ---------------------------------------------------------------- 25

BLOCK DIAGRAM ------------------------------------------------------------------ 27

BASIC MODE ------------------------------------------------------------------------ 33

REFRIGERATING CYCLE DIAGRAM----------------------------------------- 53

DESCRIPTION OF MAIN CIRCUIT OPERATION------------------------- 54

TROUBLE SHOOTING ------------------------------------------------------------ 68

PARTS LIST AND DIAGRAM---------------------------------------------------- 86

After installation

850

800

298

(W)

(A)

COOLING CAPACITY

DC INVERTER QUADRUPLE SYSTEM MULTI

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

TOTAL AMPERES

SPECIFICATIONS

OUTDOOR UNIT

RAM-70NP4B

HEATING CAPACITY

DIMENSIONS (mm)

NET WEIGHT

1ø, 220 - 240V, 50/60Hz

(kg)

(kW)

(B.T.U.)

REFER TO THE SPECIFICATIONS PAGE

RAM-70NP4B

– 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 the 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 after reinforced or at

a new location.

10. Any inﬂammable object must not

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.











– 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 (I.C.)

(3) Field-effective transistor (F.E.T.)

(4) P.C. boards or the like to 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 1M 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 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 solder 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 short circuit a load circuit or the like.

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

Staple

– 4 –

1. In quiet or stop 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 nearby, it is recommend to stop the operation and to disconnect the power cord plug

from the power outlet for safety.

3. In the event of power failure, the air conditioner will restart automatically in the previously selected mode

once the power is restored. In the event of power failure during TIMER operation, the air conditioner will

not start automatically. Re-press ON/OFF button after 3 minutes from when the unit off or power recovery.

4. If the room air conditioner is stopped by adjusting thermostat, or miss operation, 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 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)

47 W

JU151XC1

YES

5.0A

G4A

YES

450NR

YES

YES(IC)

2300gUNIT

REFRIGERANT CHARGING

VOLUME

(Refrigerant R410A)

WITHOUT REFRIGERANT BECAUSE

COUPLING IS FLARE TYPE.

PIPES (MAX.)

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

RAM-70NP4B

MAX. 60m

– 6 –

SPECIFICATIONS FOR INDOOR UNITS COMBINATION

OPERATION SCOPE

TYPE

DC INVERTER QUADRUPLE SYSTEM MULTI COOLING AND HEATING

MODEL OUTDOOR UNIT

PHASE/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-70NP4B

1ø, 220 - 240V, 50/60Hz

20A

7.00

23,900

2,110

11.32

9.7 - 8.9

8.50

29,010

2,110

13.74

9.70 - 8.90

MAX. 60m (FOUR UNIT TOTAL)

CE (EMC&LVD)

RAM-70NP4B

MODEL

PACKING

(mm)

cu.ft.

1,008

848

394

11.89

GROSS WEIGHT (kg)

(6.35DX4)/(9.52DX3)/(12.70X1)

FLARE NUT SIZE (SMALL/LARGE)

INDOOR SUCTION

TEMPERATURE (˚C)

COOLING OPERATION SCOPE

OUTDOOR SUCTION

TEMPERATURE (˚C)

INDOOR SUCTION

HUMIDITY (%)

HEATING OPERATION SCOPE

16 ~ 32 –10 ~ 43 BELOW 80

BELOW 27 –15 ~ 21 —

– 7 –

4 ROOM MULTI-SPLIT INVERTER TYPE RAC: RAM-70NP4B

POSSIBLE COMBINATION TO OPERATE (SAME TIME OPERATION)

– 8 –

– 9 –

QUADRUPLE SYSTEM MULTI R.A.C. RAM-70NP4B

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, three or four indoor units to this outdoor unit. If not, condensed water may drop,

resulting in trouble.

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