Hitachi RAM-90NP5B Service Manual
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Hitachi RAM-90NP5B Service Manual

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HIT ACHI

SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY
RAM-90NP5B
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
COOLING CAPACITY
HEATING CAPACITY
DIMENSIONS
NET WEIGHT
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

FEBRUARY 2015
(W)
(A)
(kW)
(B.T.U.)
W
(mm)
H
D
(kg)
OUTDOOR UNIT
Refrigeration & Air-Conditioning Division
NO. 0586E
PM
RAM-90NP5B
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------ 5
Installation ---------------------------------------------------------16
Wiring Diagram ---------------------------------------------------21
Main Parts Component --------------------------------------23
Circuit Diagram --------------------------------------------------25
Block Diagram ----------------------------------------------------27
PRINTED WIRING BOARD LOCATION DIAGRAM --------28
Basic Mode ----------------------------------------------------------33
Refrigerating Cycle Diagram---------------------------53
DESCRIPTION OF MAIN CIRCUIT OPERATION -----------54
TROUBLE SHOOTING ----------------------------------------------65
Parts List And Diagram --------------------------------------79
DC INVERTER FIVE SYSTEM MULTI
OUTDOOR UNIT
RAM-90NP5B
1ø, 220 - 240V, 50/60Hz
REFER TO THE SPECIFICATIONS PAGE
950
800
370
74
CONTENTS
After installation

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  • Page 1: Service Manual

    HIT ACHI NO. 0586E RAM-90NP5B SERVICE MANUAL REFER TO THE FOUNDATION MANUAL TECHNICAL INFORMATION CONTENTS FOR SERVICE PERSONNEL ONLY SPECIFICATIONS ------------------------------------------------------ 5 INSTALLATION ---------------------------------------------------------16 CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------20 WIRING DIAGRAM ---------------------------------------------------21 MAIN PARTS COMPONENT --------------------------------------23 CIRCUIT DIAGRAM --------------------------------------------------25 BLOCK DIAGRAM ----------------------------------------------------27...
  • 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 operation or stopping the running, 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 RAM-90NP5B MODEL 138 W FAN MOTOR FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR JU182XC1 COMPRESSOR COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 20A, 5.0A POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH (TEST SWITCH) TRANSFORMER VARISTOR ERZVA9V431...
  • Page 7 SPECIFICATIONS FOR INDOOR UNITS COMBINATION TYPE DC INVERTER FIVE SYSTEM MULTI COOLING AND HEATING MODEL OUTDOOR UNIT RAM-90NP5B PHESE/VOLTAGE/FREQUENCY 1ø, 220 - 240V, 50/60Hz CIRCUIT AMPERES TO CONNECT (A) CAPACITY (kW) (B.T.U./h) 29,020 COOLING TOTAL INPUT (W) 2,230 (FIVE UNITS) EER (B.T.U./hW)
  • Page 8 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. 5 ROOM MULTI-SPLIT INVERTER TYPE RAC : RAM-90NP5B POSSIBLE COMBINATION TO OPERATE (SAME TIME OPERATION) (Reference value)
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  • Page 10 Two indoor units should be connected at least. Total nominal cooling capacity should not be more than 15.5kW. <REMARKS> * ONE UNIT INDICATED ARE ONLY FOR ONE UNIT OPERATION WHEN TWO OR MORE INDOOR UNITS ARE CONNECTED. * TWO UNITS INDICATED ARE ONLY FOR TWO UNITS OPERATION WHEN TWO OR MORE INDOOR UNITS ARE CONNECTED. * THREE UNITS INDICATED ARE ONLY FOR THREE UNITS OPERATION WHEN THREE OR MORE INDOOR UNITS ARE CONNECTED.
  • Page 11 DUAL AND TRIPLE SYSTEM MULTI R.A.C. RAM-90NP5B INDOOR UNITS COMBINATIONS TO BE ABLE TO INSTALL Two, three, four or fi ve indoor units can be installed with one outdoor unit. And total nominal cooling capacity should not be more than 15.5kW Be sure to connect two, three or four indoor units to this outdoor unit.
  • Page 12 QUADRUPLE SYSTEM MULTI R.A.C. RAM-90NP5B INDOOR UNITS COMBINATIONS TO BE ABLE TO INSTALL – 11 –...
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  • Page 16 4. Air purging by using vacuum pump Remove the valve cap from the service valves located at both the large and small pipe rims Connect the charging hose A to the large service valve. After connecting the vacuum suction pump adaptor, connect the charging hose B to the adaptor.

  • Page 17: Installation

    INSTALLATION PIPE LENGTH (1) Total 75m maximum pipe length. (2) Pipe length for one indoor unit : maximum 25m. : minimum 3m. HIGHT DIFFERENCE (1) Height : maximum ± 20m (2) Height difference between each indoor unit ≤ 5m. To the outdoor unit, up to fi ve indoor units can be connected until the total value of capacity to 15.5kW. Make sure to connect two or more indoor units.
  • Page 18 MODEL: RAM-90NP5B Flare adaptor for piping The fl are adaptor for piping is re- quired depending on combination of indoor units. ø9.52 (3/8”) ➝ ø 12.7 (1/2”) One unit of 1.5kW, 1.8kW, 2.5kW, 3.5kW, 5.0kW Parts number TA261D-4 001 (5.0kW unit: Optional fl are adaptor for piping is necessary.) ø12.7(1/2”) ➝...
  • Page 19 BASE DRAIN PIPE – 18 –...
  • Page 20 RAM-90NP5B Type of grounding rod Length CAUTION SP-EB-2 900mm Arrange power cord so they do not touch service valve. Grounding rod (optional) (Earth wire and grounding rod are not supplied. Please use optional items below.) – 19 –...

  • Page 21: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAM-90NP5B Service space – 20 –...

  • Page 22: Wiring Diagram

    WIRING DIAGRAM MODEL RAM-90NP5B – 21 –...
  • Page 23 COMPRESSOR MOTOR Compressor Motor Specifi cations RAM-90NP5B MODEL JU182XC1 COMPRESSOR MODEL PHASE SINGLE RATED VOLTAGE AC 220 ~ 240 V RATED FREQUENCY 50/60 Hz POLE NUMBER CONNECTION 0.410 20°C 0.397 RESISTANCE VALUE (68°F) 0.390 0.499 75°C (167°F) 0.483 0.474 – 22 –...

  • Page 24: Main Parts Component

    MAIN PARTS COMPONENT FAN MOTOR Fan Motor Specifi cations MODEL RAM-90NP5B POWER SOURCE DC : 280V OUTPUT 138W CONNECTION RESISTANCE VALUE 20˚C U-V: 18.86 ± 1.9Ω V-W: 18.86 ± 1.9Ω W-U: 18.86 ± 1.9Ω (68˚F) BLU : BLUE YEL : YELLOW...

  • Page 25: Circuit Diagram

    CIRCUIT DIAGRAM MODEL RAM-90NP5B – 25 –...

  • Page 26: Block Diagram

    BLOCK DIAGRAM MODEL RAM-90NP5B – 27 –...
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  • Page 33 MODEL RAM-90NP5B PROM NO. LABEL NAME REQUIRED VALUE OF UNIT SIDE OH_ON_C 118.2 °C OH_OFF_C 104.7 °C OH_ON_W 100.0 °C OH_OFF_W 86.5 °C PSTARTC1_d PSTARTC1K_d PSTARTC2_d PSTARTC2K_d PSTARTC3_d PSTARTC3K_d PSTARTC4_d PSTARTC4K_d PSTARTC5_d PSTARTC5K_d PSTARTH1_d PSTARTH1S_d PSTARTH2_d PSTARTH2S_d PSTARTH3_d PSTARTH3S_d PSTARTH4_d...
  • Page 34 [Outdoor temperature >STAROTP_C] TSKTM1_C1 [Outdoor temperature ≤STAROTP_C] TSKTM1_C2 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 (CMAX1 ro CMAX2) or higher.
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  • Page 39 MODEL RAM-90NP5B ◆ ◆ Expansion valves • The expansion valves are initialized when power is supplied. The valve for unit 1 is fully closed (–520 pulses), and then that for unit 2 is fully opened (480 pulses). The valve for unit 2 is fully closed (–520 pulses), and then that for unit 3 is fully opened (480 pulses).
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  • Page 41 MODEL RAM-90NP5B • Time chart when executing defrost (Unit 1 and Unit 2 operated, Unit 3, Unit 4 and Unit 5 stopped) – 48 –...
  • Page 42 MODEL RAM-90NP5B – 49 –...
  • Page 43 MODEL RAM-90NP5B TSKTM1_C and PSTARTC2$ are EEPROM data. – 50 –...
  • Page 44 MODEL RAM-90NP5B When one unit is operated for cooling – 51 –...
  • Page 45 When one unit is operated for heating – 52 –...

  • Page 46: Refrigerating Cycle Diagram

    REFRIGERATING CYCLE DIAGRAM MODEL RAM-90NP5B – 53 –...
  • Page 47 RAM-90NP5B – 54 –...
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  • Page 72: Parts List And Diagram

    PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAM-90NP5B – 79 –...
  • Page 73 MODEL RAM-90NP5B – 80 –...
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  • Page 75 HITACHI PM NO. 0586E RAM-90NP5B Printed in Malaysia...

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