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Hitachi RUA-NP10ATS, Instruction Manual, Page: 1 / 26

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Installation, Operation and Maintenance 

INSTRUCTIONS MANUAL 

 
 
 
 

 
 

SELF-CONTAINED 
AIR CONDITIONERS 

 

Models

：

：

：

：

 

 

RUA-NP4ATS 

 

 

RUA-NP5ATS 

 

 

RUA-NP6ATS 

 

 

RUA-NP8ATS 

 

 

RUA-NP9ATS 

 

 

RUA-NP10ATS   

 
 
 
 

REFRIGERANT:R410A 

IMPORTANT: 

 

READ  AND  UNDERSTAND  THIS 
INSTRUCTION  MANUAL  BEFORE 
USING  THIS  AIR  CONDITIONER. 
KEEP THIS MANUAL FOR FUTURE 
REFERENCE. 

65MP3197 

Summary of Contents for RUA-NP10ATS

Page 1: ... SELF CONTAINED AIR CONDITIONERS Models RUA NP4ATS RUA NP5ATS RUA NP6ATS RUA NP8ATS RUA NP9ATS RUA NP10ATS REFRIGERANT R410A IMPORTANT READ AND UNDERSTAND THIS INSTRUCTION MANUAL BEFORE USING THIS AIR CONDITIONER KEEP THIS MANUAL FOR FUTURE REFERENCE 65MP3197 ...

Page 2: ...Wet Bulb Maximum Minimum Maximum Minimum All Models 52 C 125 F 20 C 68 F 35 C 21 5 C 95 F 70 5 F 19 5 C 14 C 67 F 57 F NOTES 1 When the unit is operating at a condenser air inlet temperature of 52 C DB 125 F DB the maximum evaporator air inlet temperature shall be 18 C WB 64 4 F WB 2 RUA NP4ATS RUA NP5ATS RUA NP9ATS and RUA NP10ATS 80 to 120 of Nominal Air Flow RUA NP6ATS and RUA NP8ATS 80 to 115 ...

Page 3: ...ING 4 3 1 Main Power Wiring Procedures 4 3 2 Control Wiring 4 3 3 Printed Circuit Board PCB Layout 5 4 FAN SPEED ADJUSTMENT 9 5 REMOVING SHIPPING WASHERS 10 6 TEST RUNNING 11 6 1 Final Installation Check 11 6 2 Preparation 11 6 3 Test Running 11 6 4 Test Running Record 12 6 5 Safety and Control Device Setting 15 7 MAINTENANCE 16 8 WINTER SHUTDOWN 17 9 REPLACEMENT OF PARTS 17 10 TROUBLESHOOTING 19 ...

Page 4: ...ng Unit Does Not Start 1 Is the main power source switch to the unit ON 2 Is the main fuse normal 3 Is the phase of main power source right Poor Cooling Operation 1 Are there any obstacles which hamper sufficient air to the condenser 2 Check to ensure that the thermostat is set at the desired position 3 Check the air filter for clogging 4 Are there any obstacles which hamper free air flow to the r...

Page 5: ...rder to avoid airflow obstruction due to grass or other vegetation Unit Check to ensure that the unit has been transported without damage File a damage claim with the transportation companies if mishandling due to transportation company negligence is suspected 1 2 Transportation Secure the route to the final installation location by confirming the packing dimensions see Unit General Data in Techni...

Page 6: ...Transport the unit as close to the final installation location as practical before unpacking is performed Keep the unit upright When transporting the unit after unpacking has been performed take note of the following Rolling Place three equal sized rollers under the base frames Each roller must carry both of the outer frames and must be situated to balance the unit refer to the center of gravity i...

Page 7: ...lied or optional filter box with filter must be installed at a proper location in the return air duct It is recommended that flexible duct connections be installed to minimize sound and vibration transmission All ducts running outside must be sufficiently insulated and weatherproofed 2 2 Condensate Drain Piping Tools and Instruments General piping tools Drain Trap A female piping thread screw conn...

Page 8: ...essor is equipped Because that the rotation direction of the orbiting scroll of the HITACHI scroll type compressor is fixed therefore a reverse single phase sequence protection relay is equipped in this unit If each phase R S or T of the power source is incorrectly connected the compressor does not start due to the activation of the reverse single phase sequence protection relay Therefore in order...

Page 9: ...1 Dip Switch for Capacity Setting CT2 R S T Current Transformer for NO 2 Compressor DSW2 Dip Switch for Optional Function Setting 1 CN6 Connector for Transformer Input L M Terminal for Different Main Power Supply CN7 Connector for Transformer Output A B D E F Terminal for Room Thermostat SW1 Switch for Alarm History Checking SEG1 Indicator for Information 3 3 2 Different Main Power Supply When the...

Page 10: ...and set the position of the DSW If the switches are set without turning off the power source the contents of the setting are invalid Mark of indicates the position of dip switch DSW2 Optional Function Setting 1 Number of Cpmpressor Dip Switch Setting Force No 1 Compressor Stop Force No 2 Compressor Stop 3 3 5 Alarm History Check 1 First to push SW1 continually for more than 3 seconds 2 The indicat...

Page 11: ...ce Check the connection of main power supply Refer to Main Power Wiring Procedures C1 08 Overheat forCompressor1 Internal thermostat for compressor1 acted Check the Internal Thermostat of Compressor1 C2 Overheat for Compressor2 Internal thermostat for compressor2 acted Check the Internal Thermostat of Compressor2 19 Overcurrent for Indoor Fan Motor Check the Current for Indoor Fan Motor 31 No Capa...

Page 12: ...hooting C2 Low Pressure Switch PS L 2 Acted Check the Suction Pressure for Compressor2 Refer to 10 Troubleshooting F1 57 Overheat for Outdoor Fan Motor1 Internal thermostat for outdoor fan motor1 acted Check the Internal Thermostat of Outdoor Fan Motor1 F2 Overheat for Outdoor Fan Motor2 Internal thermostat for outdoor fan motor2 acted Check the Internal Thermostat of Outdoor Fan Motor2 93 Power S...

Page 13: ...rew in the movable pulley which is positioned over the flat surfaces of the fixed pulley 5 Adjust the belt tension approximately 20 mm deflection with one finger by pushing the motor downward and tightening the bolts on the adjusting bracket For Model RUA NP4ATS RUA NP5ATS For Model RUA NP6ATS Fig 7 1 Adjustable Motor Pulley Table 1 1 Fan Speed Adjustment Models X Regulation Space of Motor Pulley ...

Page 14: ...108 8 105 7 102 6 99 4 96 3 93 1 90 0 0 4 925 110 8 40 RPM 935 905 880 855 830 805 775 750 RUA NP10ATS PD 112 0 108 8 105 7 102 6 99 4 96 3 93 1 90 0 4 1 910 99 0 44 RPM 1030 1000 970 945 915 885 855 830 RPM Fan Speed rpm PD Pitch Diameter of Motor Pulley mm RPM Turn Fan Speed Change per One Turn of Movable Motor Pulley 5 REMOVING SHIPPING WASHERS The compressor is mounted on rubber isolators and ...

Page 15: ...t the operation switch to the COOL position and the compressor and condenser fans will start 3 minutes after this operation refer to Fig 9 3 After system operation has become stabilized check the suction and discharge pressures on the compound gauges Normal operating pressures are shown in Fig 10 4 Check the operating voltage phase balance and operating current 5 Check to ensure that the thermosta...

Page 16: ... Operation Equipments Main Power Switch 1 OFF ON Room Thermostat 1 FAN AUTO ON AUTO COOL OFF ON TH Stage COOLING CALL 1st ON ON ON ON OFF ON 2nd ON ON ON OFF OFF ON Electric Components Indoor Fan Motor MIF Outdoor Fan Motor MOF Normal Start 2 Compressor 1 MC1 Compressor 2 MC2 Reverse Start 2 Compressor 1 MC1 Compressor 2 MC2 Start Delay Time Safety Devices Close Close Close Close Close Close Close...

Page 17: ...1 Nominal Operation Pressures Fig 10 2 Nominal Operation Pressures for Model RUA NP4ATS for Model RUA NP5ATS Fig 10 3 Nominal Operation Pressures Fig 10 4 Nominal Operation Pressures for Model RUA NP6ATS for Model RUA NP8ATS ...

Page 18: ...14 TEST RUNNING For Compressor Model E506DH For Compressor Model E406DH Fig 10 5 Nominal Operation Pressures for Model RUA NP9ATS Fig 10 6 Nominal Operation Pressures for Model RUA NP10ATS ...

Page 19: ...cm2G MPa kg cm2G 0 40 4 1 0 70 7 1 0 40 4 1 0 70 7 1 0 40 4 1 0 70 7 1 0 40 4 1 0 70 7 1 0 40 4 1 0 70 7 1 0 40 4 1 0 70 7 1 Overcurrent Transformer Automatic Reset Non Adjustable Cut Out A 8 3 10 6 13 0 18 0 10 6 8 3 10 6 Internal Thermostat Automatic Reset Non Adjustable Cut Out Cut In C C 130 108 130 108 130 108 130 108 130 108 130 108 CCP Timer Building on PCB Non Adjustable No 1 No 2 min min ...

Page 20: ... compressors are charged at the factory with the correct oil listed in Component Detailed Data in Technical Catalog Ⅰ and the compressor nameplate It is not necessary to add oil if the cycle remains sealed Fan Motors and Bearings All fan motors and the evaporator fan shaft bearings are pre lubricated Lubrication is not required Refrigerant Cycle Strainer Check for clogging after the time when the ...

Page 21: ...od prepare the unit for operation as follows 1 Thoroughly inspect and clean the unit 2 Clean or replace the air filters 3 Clean the condensate drain lines 4 Remove any accumulated dirt from the condenser and the evaporator coil 5 Check the fan balance and attempt to operate the fan 6 Check the fan belt tension 7 Tighten all wiring connections and access panels 9 REPLACEMENT OF PARTS Replacement of...

Page 22: ... Temperature Superheat 8 Check Pressures Discharge Pressure kg cm2G Suction Pressure kg cm2G 9 Check Voltage Rated Voltage V Operation Voltage R S V S T V T R V Starting Voltage V Phase Imbalance 1 V Vm 10 Check Compressor input and running current Input kW Running Current A 11 Do the control devices function properly 12 Do the protective devices function correctly 13 Is the refrigerant charge ade...

Page 23: ...place the Contactor Repair the Contacts Replace the Compressor Correct the Wiring No Voltage or Low Voltage Single Phase Shorted Components Loose Connections High Voltage or Low Voltage Single Phase or Phase Imbalance Faulty Fan Bearing Excessive Fan Belt Tension Excessive Fan Load Burned Coil Faulty Contact Defective Operation Switch High Voltage or Low Voltage Single Phase or Phase Imbalance Bur...

Page 24: ... Suction Pressure Low Discharge Pressure Add Refrigerant See Unit Working Range Operating High Discharge Pressure or Low Suction Pressure Clogged Capillary of Pressure Switch High or Low Pressure Switch Tripped Overcurrent Relay for Compressor Compressor Cycling Insufficient Cooling High Discharge Pressure and High Suction Pressure Loose Connections High Suction Pressure High Discharge Pressure or...

Page 25: ...tacles to Air Circulation Repair or Replace if Required Remove the Restriction Add Refrigerant See Low Discharge Pressure Noisy Operation Remove the Washers Charge the Correct Refrigerant Quantity See Low Suction Pressure Replace or Repair the Compressor Fix the Runner or Casing Properly Replace the Bearing Adjust Fan Belt Tension Clean the Strainer Add Refrigerant Tighten All Fixed Screws See the...

Page 26: ...65MP3197 ...

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