Hitachi RAS-NP10CTS Installation, Operation And Maintenance Instructions Download Page 23

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FAN SPEED ADJUSTMENT REMOVING SHIPPING WASHERS

FAN SPEED ADJUSTMENT

For models RAS-NP9US through RAS-NP15US

■

Motor Pulley Dimensions(mm)

Models

RAS-NP9US
RAS-NP10US
RAS-NP13US
RAS-NP15US

Fig. 9-2. Adjustable Motor Pulley

■

Motor Pulley Adjustment

Models

：

Regulation Space of Motor Pulley (mm)

：

Pitch Diameter of Motor Pulley (mm)

Factory Set Point

RPM/Turn

RPM

RAS-NP9US

112

109

106

103

5.3

810

95.5

RPM 950

925

895

870

845

815

790

765

RAS-NP10US

112

109

106

103

860

102.6

RPM 940

910

885

860

835

805

780

755

RAS-NP13US

112

109

106

103

0.8

900

109.6

RPM 920

895

870

845

815

790

765

740

RAS-NP15US

112

109

106

103

3.4

990

101.4

RPM 1095 1060 1030 1000 970

940

910

880

RPM

：

Fan Speed (rpm)

：

Pitch Diameter of Pulley (mm)

RPM/Turn

：

Fan Speed Change per One Turn of Movable Motor Pulley

REMOVING SHIPPING WASHERS

Compressor is mounted on rubber isolators, and is held rigidly during shipment by two sets of shipping
washers. Before compressor starting, remove the yellow-painted shipping washers, the compressor
should float freely on the rubber isolators.

Fig. 10. Removing Shipping Washers

Summary of Contents for RAS-NP10CTS

Page 1: ... RAS NP4US RAS NP4CTS RAS NP5US RAS NP5CTS RAS NP6US RAS NP6CTS RAS NP8US RAS NP8CTS RAS NP9US RAS NP9CTS RAS NP10US RAS NP10CTS RAS NP13US RAS NP13CTS RAS NP15US RAS NP15CTS REFRIGERANT R410A IMPORTANT READ AND UNDERSTAND THIS INSTRUCTION MANUAL BEFORE USING THIS AIR CONDITIONER KEEP THIS MANUAL FOR FUTURE REFERENCE 65MP3196 ...

Page 2: ... Dry Bulb Evaporator Air Inlet Temperature Dry 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 All models 80 to 120 of Nominal Air Flow Hitachi s air conditioners ...

Page 3: ... 2 Switch OFF the main power source to the unit Please contact your service shop if the trouble is still not solved Maintenance 1 Clean or replace the filter 2 Clean the cabinet with cleaner 3 Clean the condensate drain pan and the drain piping 4 Clean the condenser It is recommended that a specialist be contacted for this type of work 5 Check for abnormal sounds and vibration Stop the unit and co...

Page 4: ...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 5: ...S NP4US and RAS NP5US 1 Return Air Connection 2 Supply Air Connection 3 Refrigerant Piping Connection for Liquid Line 4 Refrigerant Piping Connection for Gas Line 5 Hole for Power Supply 6 Condensate Drain Connection RAS NP9US and RAS NP10US RAS NP6US and RAS NP8US RAS NP13US and RAS NP15US ...

Page 6: ...Units Models RAS NP4CTS through RAS NP15CTS RAS NP6CTS and RAS NP8CTS 1 Condenser Air Intake 2 Condenser Air Discharge 3 Refrigerant Piping Connection for Liquid Line 4 Refrigerant Piping Connection for Gas Line 5 Hole for Power Supply 6 Hole for Control Circuit 7 Service Panel RAS NP9CTS and RAS NP10CTS ...

Page 7: ... or concrete curbs in order to obtain proper clearance beneath the unit or confirm suspension provision for the unit shown in Fig 4 1 Condensing Unit Confirm elevation provision for the unit on a solid base with an iron frame or concrete curbs shown in Fig 4 2 in order to obtain proper clearance beneath the unit for either rooftop or on the ground installation Additionally for on the ground instal...

Page 8: ...ion Side 700mm 700mm INSTALLATION SPACE Installation Space Cooling Units Condensing Units RAS NP4US through RAS NP8US RAS NP4CTS through RAS NP10CTS RAS NP9US through RAS NP15US RAS NP13CTS and RAS NP15CTS Fig 1 Installation Space ...

Page 9: ...6US 0 6 10 0 6 12 RAS NP8US 0 6 10 0 6 15 RAS NP9US 0 6 10 0 6 16 RAS NP10US 0 6 10 0 6 16 RAS NP13US 0 6 15 0 6 16 RAS NP15US 0 6 15 0 6 16 Model Dimensions A B deg mm deg mm RAS NP4CTS 1 0 14 1 0 17 RAS NP5CTS 1 0 14 1 0 17 RAS NP6CTS 1 0 19 1 0 23 RAS NP8CTS 1 0 19 1 0 23 RAS NP9CTS 1 0 22 1 0 23 RAS NP10CTS 1 0 22 1 0 23 Model Dimensions A B deg mm deg mm RAS NP13CTS 1 0 38 1 0 21 RAS NP15CTS ...

Page 10: ...AS NP4US 510 610 970 1 130 90 RAS NP5US 510 610 970 1 130 95 RAS NP6US 600 610 1 150 1 130 120 RAS NP8US 750 610 1 430 1 130 130 RAS NP9US 800 610 1 530 1 130 145 RAS NP10US 800 610 1 530 1 130 150 RAS NP13US 820 830 1 560 1 530 200 RAS NP15US 820 830 1 560 1 530 210 Center of Gravity Fig 3 1 Weight Balance ...

Page 11: ...P5CTS 410 390 850 950 150 RAS NP6CTS 550 530 1 130 1 300 190 RAS NP8CTS 550 530 1 130 1 300 200 Model Dimensions mm Approximate Operating Weight kg A B RAS NP9CTS 700 550 265 RAS NP10CTS 700 550 265 Model Dimensions mm Approximate Operating Weight kg A B RAS NP13CTS 1 100 480 370 RAS NP15CTS 1 100 480 390 Center of Gravity Fig 3 2 Weight Balance ...

Page 12: ...l Dimensions mm A RAS NP4US 1 018 RAS NP5US 1 018 RAS NP6US 1 198 RAS NP8US 1 478 Model Dimensions mm A B RAS NP9US 1 468 988 RAS NP10US 1 468 988 RAS NP13US 1 507 1 395 RAS NP15US 1 507 1 395 Model Dimensions mm A B RAS NP4CTS 790 965 RAS NP5CTS 790 965 RAS NP6CTS 1 070 1 315 RAS NP8CTS 1 070 1 315 RAS NP9CTS 1 240 1 345 RAS NP10CTS 1 240 1 345 RAS NP13CTS 1 195 2 180 RAS NP15CTS 1 195 2 180 ...

Page 13: ...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 weight balance Fig 3 1 and Fig 3 2 Lifting by Forklift Insert the forks under the base frames and lift the unit exercising care to catch both of the outer frames Rigging Apply spreader bars to the top of the unit in order to prevent damage to the unit due to cable scr...

Page 14: ...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 to check the correct wiring connection the utilization of a phase sequence indicator is recommended when the unit is started after installation of the unit 1 If the phase is wrong exchange two of the three wires connected from the main p...

Page 15: ...r Switch Cooling Unit Field Supplied Thermostat Room RAS NP9US and Electrical Box Main Power Terminal L2 L3 L1 R 2 3 Cooling Unit Field Supplied Thermostat Room RAS NP4US through Electrical Box Main Power Terminal L2 L3 L1 R T S N 2 Mp Condensing Unit Electrical Box 3 4 5 6 Motor Terminal 1 2 3 4 5 6 L3 T S L2 L1 R Control Circuit Terminal PCB Terminal 1 B D A E F Control Circuit Field Supplied Ma...

Page 16: ...ling Unit Field Supplied Room Thermostat RAS NP13US and RAS NP15US Electrical Box Main Power Terminal S T R S T R ELECTRICAL WIRING Fig 6 2 Field Wiring Connection NOTE The control circuit is wired for the 240V control circuit unit power source 415V at the factory Therefore for the 220V control circuit change the wiring at the terminal base in the electrical control box according to the next page ...

Page 17: ...etting CT2 R S T Current Transformer for NO 2 Compressor DSW2 Dip Switch for Optional Function Setting 1 CT3 R S T Current Transformer for NO 3 Compressor DSW3 Dip Switch for Optional Function Setting 2 CT4 R S T Current Transformer for NO 4 Compressor DSW4 Dip Switch for Optional Function Setting 3 CN6 Connector for Transformer Input L M Terminal for Different Main Power Supply CN7 Connector for ...

Page 18: ...e 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 Compressor Dip Switch Setting Force No 1 Compressor Stop Force No 2 Compressor Stop Alarm History Check 1 First to push SW1 continually for more than 3 seconds 2 The indicator w...

Page 19: ... 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 Capaci...

Page 20: ...oting C2 Low Pressure Switch PS L 2 Acted Check the Suction Pressure for Compressor2 Refer to 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 Supply...

Page 21: ...Drain Piping Tools and Instruments General Piping Tools Trap A female piping thread screw connection is provided Dimension L in Fig 7 should be sufficiently longer than the negative fan pressure at the drain connection 50 mm to 100 mm depends on the return air duct design Always fill the trap with water Fig 7 Condensate Drain Connection NOTE When the relative humidity of inlet air or ambient air e...

Page 22: ...on approximately 20 mm deflection with one finger by pushing the motor downward and tightening the bolts on the adjusting bracket For models RAS NP4US through RAS NP8US Motor Pulley Dimensions mm Models a b c d RAS NP4US 16 14 5 79 RAS NP5US 101 RAS NP6US RAS NP8US 21 5 19 6 104 5 For Model RAS NP4US and RAS NP5US For Model RAS NP6US and RAS NP8US Fig 9 1 Adjustable Motor Pulley Motor Pulley Adjus...

Page 23: ... NP10US PD 112 109 106 103 99 96 93 90 3 860 102 6 40 RPM 940 910 885 860 835 805 780 755 RAS NP13US PD 112 109 106 103 99 96 93 90 0 8 900 109 6 39 RPM 920 895 870 845 815 790 765 740 RAS NP15US PD 112 109 106 103 99 96 93 90 3 4 990 101 4 46 RPM 1095 1060 1030 1000 970 940 910 880 RPM Fan Speed rpm PD Pitch Diameter of Pulley mm RPM Turn Fan Speed Change per One Turn of Movable Motor Pulley REMO...

Page 24: ...pression resistance of the flare for R410A the flare opening must be enlarged In the case of continual use of the existing item a washers 1mm matching with the pipe expansion adjustment must be used In the case of 1 2H copper pipe it is impossible to process Expanding flare of the refrigerant pipe Washers for pipe expansion adjustment For copper pipe overhang size control when processing flares Pi...

Page 25: ...ed For vacuum drying Straightener for vacuum pump Preventing backflow Manifold gage Compared to old refrigerant R 22 new refrigerant R410A has higher pressure resistant standard Therefore they are not exchangeable Connection screw specification of R410A UNF1 2 Use of pressure gage for old refrigerant R 22 is prohibited If mineral residue attached in the gage flows to the air conditioner it may cau...

Page 26: ...10CTS No 1 E506DH 15 25 5 30 No 2 E506DH 15 25 5 30 RAS NP13US RAS NP13CTS No 1 E856DH 15 25 6 30 No 2 E506DH 15 25 6 30 RAS NP15US RAS NP15CTS No 1 E856DH 15 25 6 30 No 2 E856DH 15 25 6 30 A The condensing unit is installed below the cooling unit B The condensing unit is installed above the cooling unit Maximum Length without Solenoid Valve Control Maximum Length with Solenoid Valve Shut Off Cont...

Page 27: ...Material 1 0 1 2H Material Ø28 6 1 3 O Material 1 0 1 2H Material Ø34 9 1 4 O Material 1 1 1 2H Material Selection of the connection section Depending on the change of the design pressure the thickness bending head connecting pipe etc of the connection section should also be changed Therefore select suitable Flare nut size according to the Copper pipe diameter listed in the following table Pay att...

Page 28: ...the unit stop valves 5 Be sure to conduct the leakage test NOTES 1 The above evacuation and charging procedures should be accomplished for both refrigeration cycles of the dual circuited models 2 A gauge manifold or equivalent piping connected with a vacuum pump and a refrigerant charging cylinder is recommended for rapid evacuation and charging work 3 When charging by weight is ceased due to high...

Page 29: ...d only when the line is exposed to a higher temperature heat source 4 After completion of the piping work charge refrigerant or nitrogen gas and inspect for leakage with the gas leakage detector or pressure indication of the gauge which can be attached at the service joint of the unit Refrigerant Piping Size and Refrigerant Charging Data Charge correct quantity of refrigerant in accordance with th...

Page 30: ...rge kg 4 3 5 0 5 9 6 9 7 7 8 5 Additional Oil Charge ℓ ℓ ℓ ℓ 0 2 0 3 0 4 RAS NP10US RAS NP10CTS No 1 E506DH L ODxT PD 12 7 1 0 0 02 2 0 12 7 1 0 0 04 3 9 12 7 1 0 0 06 5 9 15 88 1 2 0 03 2 9 15 88 1 2 0 03 2 9 15 88 1 2 0 04 3 9 G ODxT PD 19 05 1 4 0 13 12 7 19 05 1 4 0 26 25 5 22 2 1 5 0 17 16 7 22 2 1 5 0 23 22 6 22 2 1 5 0 28 27 5 22 2 1 5 0 34 33 3 Refrigerant Charge kg 4 5 5 2 6 0 7 0 7 8 8 6...

Page 31: ...the cooling unit and the condensing unit Since these valves are not the back seat type pay attention to the following points when operating the valves Fig 12 1 Stop Valve for Flange Connection Type Fig 12 2 Stop Valve for Flare Connection Type NOTES 1 All piping methods including a leakage test must comply with applicable national and local codes 2 Do not apply force to the spindle valve when the ...

Page 32: ...hrough RAS NP8US RAS NP8CTS Mark Name 1 Compressor 2 Condenser 3 Liquid Outlet Stop Valve 4 Accumulator 5 Capillary Tube 6 Evaporator 7 Gas Inlet Stop Valve 8 Check Joint High Side 9 Check Joint Low Side 10 High Pressure Switch 11 Low Pressure Switch 12 Strainer Field Refrigerant Pipe Field Supplied For Combined Models RAS NP9US RAS NP9CTS through RAS NP15US RAS NP15CTS Mark Name 1 Compressor 2 Co...

Page 33: ...rm that the system switch on the room thermostat is at the OFF position Pressure Gauge Equip high and low pressure compound gauges according to Fig 13 Thermostat Set the thermostat at a lower temperature than the room temperature Test Running Test running should be performed as follows when the unit is wired according to the wiring label 1 Check to ensure that electrical resistance is more than 1 ...

Page 34: ...quence Operational Sequence Chart For models RAS NP9US RAS NP9CTS through RAS NP15US RAS NP15CTS ON OFF 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 1 MOF1 Outdoor Fan Motor 2 MOF2 Normal Start 2 Compressor 1 MC1 Compresso...

Page 35: ...3 3 2 32 6 Low Pressure switch Automatic Reset Non Adjustable Cut Out Cut In MPa kg cm2 G MPa kg cm2 G 0 4 4 1 0 7 7 1 0 4 4 1 0 7 7 1 0 4 4 1 0 7 7 1 0 4 4 1 0 7 7 1 0 4 4 1 0 7 7 1 0 4 4 1 0 7 7 1 0 4 4 1 0 7 7 1 0 4 4 1 0 7 7 1 Overcurrent Transformer Automatic Reset Non Adjustable Cut Out A 8 3 10 6 13 0 18 0 8 3 10 6 10 6 18 0 10 6 18 0 Internal Thermostat Automatic Reset Non Adjustable Cut O...

Page 36: ...nal Operation Pressures Fig 15 2 Nominal Operation Pressures for Model RAS NP4US RAS NP4CTS for Model RAS NP5US RAS NP5CTS Fig 15 3 Nominal Operation Pressures Fig 15 4 Nominal Operation Pressures for Model RAS NP6US RAS NP6CTS for Model RAS NP8US RAS NP8CTS ...

Page 37: ...ominal Operating Pressure For Compressor Model E506DH For Compressor Model E406DH Fig 15 5 Nominal Operation Pressures for Model RAS NP9US RAS NP9CTS Fig 15 6 Nominal Operation Pressures for Model RAS NP10US RAS NP10CTS ...

Page 38: ...minal Operating Pressure For Compressor Model E856DH For Compressor Model E506DH Fig 15 7 Nominal Operation Pressures for Model RAS NP13US RAS NP13CTS Fig 15 8 Nominal Operation Pressures for Model RAS NP15US RAS NP15CTS ...

Page 39: ...the factory with the correct oil listed on the compressor nameplates It is not necessary to add oil if the refrigeration cycle remains sealed Fan Motor Bearings of the fan motor are pre lubricated Lubrication is not required Fan shaft Bearings The bearings have been pre lubricated and sealed at the factory However when the ambient air is dirty and humid the bearings should be greased from the grea...

Page 40: ...s 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 evaporator coils 5 Check the fan belt tension 6 Check the fan balance and try to operate the fan 7 Inspect the refrigerant piping for leakage 8 Tighten all wiring connections and access panels Replacement of Parts Replacement o...

Page 41: ... 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 42: ... 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 Burned Coil ...

Page 43: ...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 Low Suction Pressure Tripped High Voltage or...

Page 44: ...d Screws See the Installation Guide Clean the Flexible Ducts Evaporator Air Inlet Temperature High Suction Pressure High Excessive Fresh Air Intake Insufficient Duct Insulation Defective Compressor Valve Overcharged Refrigerant High Discharge Pressure Evaporator Air Flow Low Suction Pressure Restricted Clogged Air Filter Slipping Fan Belt Restricted Duct Low Fan Speed Faulty Fan Motor Short Cyclin...

Page 45: ...65MP3196 ...

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