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Related Manuals for Hitachi RUA-NP20ATS
Summary of Contents for Hitachi RUA-NP20ATS
- Page 1 SELF-CONTAINED AIR CONDITIONERS Models: RUA-NP20ATS Installation, Operation and Maintenance RUA-NP30ATS INSTRUCTIONS MANUAL REFRIGERANT:R410A IMPORTANT: READ AND UNDERSTAND THIS INSTRUCTION MANUAL BEFORE USING THIS AIR CONDITIONER. KEEP THIS MANUAL FOR FUTURE REFERENCE. 65MP3208...
- Page 2 The types of charging refrigerants are indicated in the Installation and Maintenance Manuals, Technical Catalogs, Service Manuals and the specification label in the each unit. Be aware that Hitachi does not take any responsibility for unit failure, troubles of malfunction, and any accidents caused by charging the...
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Page 3: Table Of Contents
— CONTENTS — No. Item ....................Page Operation Instructions................Ⅰ PREPARATION ................... 1 1.1 Initial Check......................1.2 Transportation ....................... 1.3 Placing the Unit ..................... INSTALLATION .................. 3 2.1 Ducting Arrangement .................... 2.2 Condensate Drain Piping ..................ELECTRICAL WIRING ............... 3 3.1 Main Power Wiring Procedures ................ -
Page 5: Preparation
1,910 2,450 1,910 1,000 1,000 1,000 1,000 1,400 Fig. 1. Operation Space NOTE: When the unit is installed at a location, which is encircled with walls and obstruction to free air circulation is suspected, consult HITACHI regarding the operation space. -
Page 6: Placing The Unit
PREPARATION Dimensions Model deg. deg. RUA- NP 2 0ATS RUA- NP30ATS Fig. 2. Foundation Gradient Dimensions (mm) Model RUA-NP 2 0ATS 1,970 1,540 2,308 2,068 RUA-NP30ATS For Model RUA-NP 2 0AT S For Model RUA-NP3 0AT S Fig. 3. Recommended Concrete Curbs 1.3 Placing the Unit Tools and Instruments –... -
Page 7: Installation
A scroll compressor is equipped. Because that the rotation direction of the orbiting scroll of the Fig. 5. Condensate Drain Connection HITACHI scroll type compressor is fixed, therefore a reverse & single phase sequence protection relay is equipped in this unit. -
Page 8: Control Wiring
ELECTRICAL WIRING If each phase R, S or T of the power source is (2) Do not operate the compressor by depressing incorrectly connected, the compressor does not the button of the magnetic switch for the start due to the activation of the reverse & single compressor. - Page 9 ELECTRICAL WIRING 3.3.3 Optional Function Settings of Dip Switch (DSW2,3) Before setting DSW, firstly turn off power source 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.
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Page 10: Fan Speed Adjustment
REMOVING SHIPPING WASHERS FAN SPEED ADJUSTMENT 4. FAN SPEED ADJUSTMENT The unit is equipped with an adjustable motor 5. Adjust the belt tension (approximately 20 mm pulley. The fan speed can be varied through a deflection with one finger) by pushing the motor given range by adjustment of the pulley. -
Page 11: Test Running
– Test running should be performed as follows, Tools and Instruments High and Low when the unit is wired according to the HITACHI Pressure Compound Gauge(s), An Electric Tester, standard wiring label. and General Tools. 1. Set the operation switch to the FAN position –... -
Page 12: Test Running Record
TEST RUNNING 6.4 Test Running Record Compile test running records according to Table 4. Utilize these records for periodic operation checks, as well as for troubleshooting. Operational Sequence Chart : ON : OFF Operation *Main Power Switch Equipments AUTO AUTO COOL... -
Page 13: Safety And Control Device Setting
TEST RUNNING 6.5 Safety and Control Device Setting Table 3. Safety and Control Device Setting Model RUA-NP20ATS RUA-NP30ATS For Compressor E505DH/E855DH E855DH High Pressure Switch Automatic Reset, Non-Adjustable Cut-Out 4.15 4.15 kg/cm 42.3 42.3 Cut-In kg/cm 32.6 32.6 Overcurrent Relay... -
Page 14: Maintenance
MAINTENANCE 7. MAINTENANCE unit should periodically inspected Refrigerant Cycle according to the same items as those described in Strainer – Check for clogging after the time when the paragraph entitled "Test Running". In order to the cycle is opened. ensure dependable operation and long life, the Refrigerant Re-Charge –... -
Page 15: Winter Shutdown
Replacement of parts should be performed by because explosion can occur. It ordering from the HITACHI Parts List. The Form A is recommended that HITACHI Recommended Spare Parts List is advisable. When replacement of parts becomes... - Page 16 MAINTENANCE Table 4. Test Running and Maintenance Record MODEL: RUA-_____________ MFG. NO._________________COMPRESSOR MFG. NO.:____________ CUSTOMER'S NAME AND ADDRESS:___________________________________DATE: ____________ 1. Is the rotation direction of the evaporator fan correct? 2. Is the rotation direction of the condenser fan correct? 3. Are there any abnormal sounds? 4.
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Page 17: Troubleshooting
TROUBLESHOOTING 10.TROUBLESHOOTING Troubleshooting Charts The following charts show efficient checking procedures for trouble. ：Fault ：Check ：Cause No Brackets：Remedy No Cooling No Cooling (Compressor Does Not Start) Stopped Evaporator Fan Motor No Voltage or Low Voltage ---------------------------------- Obtain the Correct Voltage Operating Faulty Unit Power Supply... - Page 18 TROUBLESHOOTING Insufficient Cooling Insufficient Cooling Cycling ON Compressor Cycling High Discharge Pressure or ---------------------------- See ”High Discharge Pressure” or Operating Low Suction Pressure ”Low Suction Pressure” Tripped High or Low Clogged Capillary of Pressure Switch ---------------------------- Repair the Clogging and Pressure Switch Replace the Switch if Required Faulty Switch...
- Page 19 TROUBLESHOOTING High Suction Pressure High Suction Pressure Excessive Fresh Air Intake -----------------------------Reduce the Fresh Air Intake High Evaporator Air Inlet Temperature Insufficient Duct Insulation -----------------------------Reinforce the Duct Insulation Defective Compressor Valve -----------------------------Replace or Repair the Compressor Overcharged Refrigerant -----------------------------Charge Correct Refrigerant Quantity -----------------------------See ”High Discharge Pressure”...
- Page 20 65MP3208 Printed in the Philippines...