Hitachi RAM-70NP4B Service Manual
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Hitachi RAM-70NP4B Service Manual

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SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY
RAM-70NP4B
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
COOLING CAPACITY
HEATING CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

JANUARY 2015
(W)
(A)
(kW)
(B.T.U.)
W
H
D
(kg)
OUTDOOR UNIT
Refrigeration & Air-Conditioning Division
PM
RAM-70NP4B
REFER TO THE FOUNDATION MANUAL
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
DC INVERTER QUADRUPLE SYSTEM MULTI
OUTDOOR UNIT
RAM-70NP4B
1ø, 220 - 240V, 50/60Hz
REFER TO THE SPECIFICATIONS PAGE
850
800
298
58
NO. 0585E
CONTENTS
After installation

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Summary of Contents for Hitachi RAM-70NP4B

  • Page 1: Service Manual

    NO. 0585E RAM-70NP4B SERVICE MANUAL REFER TO THE FOUNDATION MANUAL TECHNICAL INFORMATION CONTENTS FOR SERVICE PERSONNEL ONLY SPECIFICATIONS ---------------------------------------------------------------------5 FEATURES ---------------------------------------------------------------------------- 11 INSTALLATION ----------------------------------------------------------------------- 15 CONSTRUCTION AND DIMENSIONAL DIAGRAM ----------------------- 19 MAIN PARTS COMPONENT ---------------------------------------------------- 20 WIRING DIAGRAM ----------------------------------------------------------------- 23...
  • Page 2 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.
  • Page 3 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.
  • Page 4 (6) Use a three wire type soldering iron including a grounding wire. Metal plate (of aluminium, stainless steel, etc.) Bare copper wire (for body earth) Working table Resistor 1 M (1/2W) Staple Earth wire Fig. 3. Grounding of the working table Soldering iron Grounding wire Screw stop at the screwed...
  • Page 5 CAUTION In quiet or stop operation, slight fl owing noise of refrigerant in the refrigerating cycle is heard occasionally, but this noise is not abnormal for the operation. When it thunders nearby, it is recommend to stop the operation and to disconnect the power cord plug from the power outlet for safety.

  • Page 6: Specifications

    SPECIFICATIONS MODEL RAM-70NP4B FAN MOTOR 47 W FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR JU151XC1 COMPRESSOR COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 5.0A POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER 450NR VARISTOR NOISE SUPPRESSOR YES(IC)
  • Page 7 SPECIFICATIONS FOR INDOOR UNITS COMBINATION TYPE DC INVERTER QUADRUPLE SYSTEM MULTI COOLING AND HEATING MODEL OUTDOOR UNIT RAM-70NP4B 1ø, 220 - 240V, 50/60Hz PHASE/VOLTAGE/FREQUENCY CIRCUIT AMPERES TO CONNECT (A) 7.00 CAPACITY (kW) (B.T.U./h) 23,900 COOLING TOTAL INPUT (W) 2,110 (FOUR UNITS) EER (B.T.U./hW)
  • Page 8 4 ROOM MULTI-SPLIT INVERTER TYPE RAC: RAM-70NP4B POSSIBLE COMBINATION TO OPERATE (SAME TIME OPERATION) – 7 –...
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  • Page 10 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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  • Page 17 One unit of 1.5kW, 1.8kW, 2.5kW, 3.5kW or 5.0kW (5kW unit: Optional flare adaptor for piping is necessary.) One unit of 1.5kW, 1.8kW, 2.5kW, 3.5kW or 5.0kW (5kW unit: Optional flare adaptor for piping is necessary.) One unit of 1.5kW, 1.8kW, 2.5kW, 3.5kW or 5.0kW (5kW unit: Optional flare adaptor for piping is necessary.) One unit of 1.5kW, 1.8kW, 2.5kW, 3.5kW or 5.0kW...
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  • Page 21 RAM-70NP4B – 20 –...
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  • Page 23: Wiring Diagram

    WIRING DIAGRAM MODEL RAM-70NP4B – 23 –...

  • Page 24: Circuit Diagram

    CIRCUIT DIAGRAM MODEL RAM-70NP4B – 25 –...

  • Page 25: Block Diagram

    BLOCK DIAGRAM MODEL RAM-70NP4B – 27 –...
  • Page 26 PRINTED WIRING BOARD LOCATION DIAGRAM RAM-70NP4B Main board [component side] – 28 –...
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  • Page 33 Notes: (1) Cool dash is started when the operation is started at fan speed “AUTO” or “HI” or when the fan speed is changed to “AUTO” or “HI” during cooling operation, and when the compressor speed (P item) reaches (CMAX_M or CMAX2_M) or higher. (2) The maximum compressor speed period during cool dash is fi...
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  • Page 38 MODEL RAM-70NP4B – 46 –...
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  • Page 77 MODEL RAM-70NP4B – 85 –...

  • Page 78: Parts List And Diagram

    PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAM-70NP4B – 86 –...
  • Page 79 MODEL RAM-70NP4B Q’TY / UNIT PARTS NAME PART NO. KPNT1 PUSH NUT PMRAC-24CP5 TOP COVER PMRAC-25NH4 OVERHEAT THERMISTOR SUPPORT PMRAM-72QH5 VALVE (4S) PMRAC-63CA1 TERMINAL BOARD (2P) PMRAC-70YHA SIDE PLATE L PMRAC-70YHA NET COVER PMRAC-70YHA D-GRILL-AS (INCL. MOUTH RING) PMRAC-70YHA PMRAC-70YHA...
  • Page 80 Q’TY / UNIT PARTS NAME PART NO. PMRAM-72Q8 THERMISTOR (OH) PMRAM-72QH5 STRAINER (ST-PIPE-AS 1) PMRAM-72QH5 STRAINER (ST-PIPE-AS 2) PMRAM-72QH5 STRAINER (ST-PIPE-AS 3) PMRAM-72QH5 STRAINER (ST-PIPE-AS 4) PMRAM-72QH5 SV-COVER PMRAM-72QH5 CONDENSER PMRAM-72QH5 SIDE PLATE R PMRAM-72QH5 THERMISTOR-PIPE (W) PMRAM-72QH5 THERMISTOR-PIPE (R) PMRAM-72QH5 SUPPORT (DEF-THERMISTOR) PMSMARTY235M...
  • Page 81 HITACHI PM NO. 0585E RAM-70NP4B Printed in Malaysia...

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