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Installation, Operation and Maintenance
INSTRUCTIONS MANUAL
REFRIGERANT:R410A
IMPORTANT:
READ AND UNDERSTAND THIS
INSTRUCTION MANUAL BEFORE
USING THIS AIR CONDITIONER.
KEEP THIS MANUAL FOR FUTURE
REFERENCE.
SPLIT-SYSTEM
AIR CONDITIONERS
Models： ： ： ：
Cooling Units
RAS-NP4US
RAS-NP5US
RAS-NP6US
RAS-NP8US
RAS-NP9US
RAS-NP10US
RAS-NP13US
RAS-NP15US
Condensing Units
+ RAS-NP4CTS
+ RAS-NP5CTS
+ RAS-NP6CTS
+ RAS-NP8CTS
+ RAS-NP9CTS
+ RAS-NP10CTS
+ RAS-NP13CTS
+ RAS-NP15CTS
65MP3196
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Summary of Contents for Hitachi RAS-NP4US
- Page 1 SPLIT-SYSTEM AIR CONDITIONERS Models： ： ： ： Cooling Units Condensing Units RAS-NP4US + RAS-NP4CTS RAS-NP5US + RAS-NP5CTS RAS-NP6US + RAS-NP6CTS Installation, Operation and Maintenance RAS-NP8US + RAS-NP8CTS RAS-NP9US + RAS-NP9CTS INSTRUCTIONS MANUAL RAS-NP10US + RAS-NP10CTS RAS-NP13US + RAS-NP13CTS RAS-NP15US + RAS-NP15CTS...
- 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...
- Page 3 OPERATION INSTRUCTIONS HITACHI Split-System Air Conditioners For Combined Models: 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 Maintenance Starting Procedures Troubleshooting Unit Does Not Start 1. Switch ON the main power source to the 1. Clean or replace the filter.
- Page 4 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...
- Page 5 HITACHI Split-System Air Conditioners Cooling Units Models: RAS-NP4US through RAS-NP15US 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...
- Page 6 HITACHI Split-System Air Conditioners Condensing Units Models: RAS-NP4CTS through RAS-NP15CTS 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...
- Page 7 PREPARATION Preparation Initial Check Required Materials - Measure, Architectural Information, Regarding Installation Location. Installation Location - Confirm that the final installation location is available for convenient piping, wiring and ducting work. Strong water runoff should be avoided. Installation Space - Check for obstacles which restrict air flow or hamper maintenance work in the space specified in Fig.
- Page 8 INSTALLATION SPACE Installation Space Cooling Units Condensing Units RAS-NP4US through RAS-NP8US RAS-NP4CTS through RAS-NP10CTS Refrigerant Piping Connection Side RAS-NP9US through RAS-NP15US RAS-NP13CTS and RAS-NP15CTS Installation Fig. 1. Space...
- Page 9 MAXIMUM FOUNDATION GRADIENT Maximum Foundation Gradient Cooling Units Dimensions Model deg. deg. RAS-NP4US RAS-NP5US RAS-NP6US RAS-NP8US RAS-NP9US RAS-NP10US RAS-NP13US RAS-NP15US Condensing Units Dimensions Model deg. deg. RAS-NP4CTS RAS-NP5CTS RAS-NP6CTS RAS-NP8CTS RAS-NP9CTS RAS-NP10CTS Dimensions Model deg. deg. RAS-NP13CTS RAS-NP15CTS Fig.2 Maximum Foundation Gradient...
- Page 10 WEIGHT BALANCE Weight Balance Cooling Units Approximate Dimensions (mm) Operating Model Weight (kg) RAS-NP4US 1,130 RAS-NP5US 1,130 RAS-NP6US 1,150 1,130 RAS-NP8US 1,430 1,130 RAS-NP9US 1,530 1,130 RAS-NP10US 1,530 1,130 RAS-NP13US 1,560 1,530 RAS-NP15US 1,560 1,530 ◎ ◎ ◎ ◎ ： ： ： ： Center of Gravity...
- Page 11 WEIGHT BALANCE Weight Balance Condensing Units Approximate Dimensions (mm) Operating Model Weight (kg) RAS-NP4CTS RAS-NP5CTS RAS-NP6CTS 1,130 1,300 RAS-NP8CTS 1,130 1,300 Approximate Dimensions (mm) Operating Model Weight (kg) RAS-NP9CTS RAS-NP10CTS Dimensions (mm) Approximate Operating Model Weight (kg) RAS-NP13CTS 1,100 RAS-NP15CTS 1,100 ◎...
- Page 12 FOUNDATION PROVISION Foundation Provision Cooling Units Dimensions (mm) Model RAS-NP4US 1,018 RAS-NP5US 1,018 RAS-NP6US 1,198 RAS-NP8US 1,478 RAS-NP4US through RAS-NP8US Dimensions (mm) Model RAS-NP9US 1,468 RAS-NP10US 1,468 RAS-NP13US 1,507 1,395 RAS-NP15US 1,507 1,395 RAS-NP9US through RAS-NP15US Fig.4-1. Foundation Provision Condensing Units...
- Page 13 PLACING THE UNIT Placing the Unit Tools and Instruments- Pincers, Wrenches, Facilities to transport and place the unit. Transportation- 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.
- Page 14 The setting and the capacity of the overcurrent relay and the magnetic contactor equipped in the condensing unit are only applicable for the cooling unit of the HITACHI Standard Split System. When other cooling unit is to be connected, it might be necessary to change them in accordance with the...
- Page 15 RAS-NP4CTS through RAS-NP8CTS Electrical Box Main Power Terminal Control Circuit Terminal 3 4 5 L2 L3 Solenoid Valve (Cooling Unit) (Field-Supplied) RAS-NP4US through RAS-NP8US Electrical Box Motor Terminal Control Circuit Terminal Main Power Switch (Field-Supplied) 1 2 3 4 5 6 ※Room...
- Page 16 ELECTRICAL WIRING (Condensing Unit) RAS-NP13CTS and RAS-NP15CTS Electrical Box Main Power Terminal L2 L3 Solenoid Solenoid Motor Terminal Valve NO.2 Valve NO.1 (Field-Supplied) (Field-Supplied) Main Power Switch (Field-Supplied) ※Room Thermostat Electrical Box (Field-Supplied) (Cooling Unit) RAS-NP13US and RAS-NP15US Fig. 6-2. Field Wiring Connection NOTE: The control circuit is wired for the 240V control circuit (unit power source, 415V) at the factory.
- Page 17 ELECTRICAL WIRING Printed Circuit Board (PCB) Layout All DSW were set correctly at factory, do not change settings of DSW. The following figures are only for reference in installation. After installation, make sure all DSW were set as factory setting. PCB Drawing The PCB in the Unit is operating with 4 types of DIP switches.
- Page 18 ELECTRICAL WIRING Factory Setting of Dip Switch (DSW) DSW1: Capacity Setting Capacity 10HP 13HP 15HP Setting Position DSW2: DSW3: DSW4: Optional Function Setting(1) Optional Function Setting(2) Optional Function Setting(3) Function 4~15HP Function 4~15HP Function 4~15HP Setting Setting Setting Position Position Position 1 3 4 1 3 4...
- Page 19 ELECTRICAL WIRING Alarm Detect Function (1) Each alarm code is composed of 2 digits for 1 set, or 4 digits for 2 sets. (2) If the alarm code is composed of 1 set(2 digits)： (3) If the alarm code is composed of 2 sets(4 digits)： (4) If the system is operated under abnormal conditions, the alarm code will be showed as digits by the indicator.
- Page 20 ELECTRICAL WIRING (Continued) Alarm Code Description Check Item CT for Compressor1 Disconnected. Check the Connection for CT1. CT for Compressor2 Disconnected. Check the Connection for CT2. Check the Discharge Pressure for High Pressure Switch PS(H)1 Acted. Compressor1.(Refer to Troubleshooting) Check the Discharge Pressure for High Pressure Switch PS(H)2 Acted.
- Page 21 CONDENSATE DRAIN PIPING Condensate 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).
- Page 22 4. Tighten the set screw 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 models RAS-NP4US through RAS-NP8US ■Motor Pulley Dimensions(mm) Models RAS-NP4US...
- Page 23 REMOVING SHIPPING WASHERS FAN SPEED ADJUSTMENT 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 X：Regulation Space of Motor Pulley (mm) Factory Set Point PD：Pitch Diameter of Motor Pulley (mm) Models RPM/Turn RAS-NP9US...
- Page 24 REFRIGERANT PIPING Refrigerant Piping Tools and Instruments - The pressure of refrigerant R410A is about 1.6 times higher than that of currently used R-22 refrigerant. Therefore it is more susceptible to impurities such as moisture, acid, grease, etc. As this is a new refrigerant, the refrigeration oil also has to be changed.
- Page 25 REFRIGERANT PIPING Refrigerant Piping (Continued) Measuring Instrument, Interchange Reason of Non-Interchange and Attention Application ( ◎ : Strictly Required) tool with R-22 Identification color is available outside the refrigerant cylinder. (R410A: Pink) □ ◎ (Charging of refrigerant in the gas state is Refrigerant For refrigerant charging cylinder...
- Page 26 Table 1. Table 1. Refrigerant Piping Limitation Maximum Lift (m) Maximum Equivalent Refrigerant Cycle Model Piping Length (Compressor Model) - One Way - (m) *5/**30 RAS-NP4US+RAS-NP4CTS E406DH RAS-NP5US+RAS-NP5CTS E506DH *5/**30 RAS-NP6US+RAS-NP6CTS E626DH *5/**30 RAS-NP8US+RAS-NP8CTS E856DH *5/**30 No.
- Page 27 REFRIGERANT PIPING Refrigerant Piping Selection of piping thickness Depending on the change of the design pressure, the piping thickness and the material should also be changed. Unit: mm Existing refrigerant New refrigerant Copper pipe R-22 R410A diameter Thickness Copper pipe material Thickness Copper pipe material Ø9.53...
- Page 28 REFRIGERANT PIPING Evacuation and Refrigerant Charge Tools and Instruments - Vacuum pump, High Pressure Compound Gauge, Low Pressure Compound Gauge, Refrigerant cylinder with Sufficient R410A, Weighing Scale, Refrigerating Oil (if Required), Charging Hoses, and Other General Piping Tools. Preparation - Confirm the required amount of refrigerant, referring to Table 2. Arrange piping connection work for evacuation and refrigerant charge, as shown in Fig.
- Page 29 The tolerance of the charging volume should be kept within ±0.1kg. Table 2-1 Refrigerant of Holding Charge Cooling Unit Condensing Unit Model Charge (kg) Model Charge (kg) RAS-NP4US RAS-NP4CTS RAS-NP5US RAS-NP5CTS RAS-NP6US RAS-NP6CTS RAS-NP8US RAS-NP8CTS RAS-NP9US 0.5X2...
- Page 30 Equivalent Piping Length (One Way for Each Cycle) -(m)- Model (Compressor Model) ODxT 12.7×1.0 12.7×1.0 12.7×1.0 15.88×1.2 15.88×1.2 15.88×1.2 0.01(1.0) 0.02(2.0) 0.03(2.9) 0.01(1.0) 0.02(2.0) 0.02(2.0) RAS-NP4US ODxT 19.05×1.4 19.05×1.4 22.2×1.5 22.2×1.5 22.2×1.5 22.2×1.5 E406DH 0.13(12.7) 0.26(25.5) 0.17(16.7) 0.23(22.6) 0.28(27.5) 0.34(33.3) RAS-NP4CTS *Refrigerant Charge (kg) ─...
- Page 31 REFRIGERANT PIPING Stop Valve Construction - Stop valves shown in Fig. 12. are utilized for connection ports of the refrigerant piping between 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. Hexagonal Wrench (Install after work is finished)
- Page 32 REFRIGERANT PIPING For Combined Models: RAS-NP4US+RAS-NP4CTS through RAS-NP8US+RAS-NP8CTS Mark Name Compressor Condenser Liquid Outlet Stop Valve Accumulator Capillary Tube Evaporator Gas Inlet Stop Valve Check Joint (High Side) Check Joint (Low Side) High Pressure Switch Low Pressure Switch Strainer : Field Refrigerant Pipe...
- Page 33 TEST RUNNING Installation Final Check Inspect the installation work according to all documents and drawings. Table 3. shows the minimum check points. Table 3. Installation Work check List INSTALLATION WORK CHECK LIST 1. Is the unit solidly mounted and levelled? 2.
- Page 34 Test Running Record Compile test running records according to Table 5. Utilize these records for periodic o , as peration checks well as for troubleshooting. Operational Sequence Chart For models: RAS-NP4US+RAS-NP4CTS through RAS-NP8US+RAS-NP8CTS : ON : OFF Main Power Switch(*1) Operation Equipments...
- Page 35 TEST RUNNING Table 4. Safety and Control Device Setting Cooling Unit Model RAS-4U2S RAS-5U2S RAS-6U2S RAS-8U2S RAS-9U2S RAS-10U2S For Evaporator Fan Motor Manual Reset, Adjustable Overcurrent Relay Condensing Unit RAS- RAS- RAS- RAS- RAS- RAS- RAS- RAS- Models NP4CTS NP5CTS NP6CTS NP8CTS NP9CTS...
- Page 36 TEST RUNNING Nominal Operating Pressure Fig. 15-1 Nominal 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 TEST RUNNING Nominal 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 TEST RUNNING Nominal 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 unit should be periodically inspected according to the same items as those described in the paragraph titled “Test Running”. In order to ensure dependable operation and long life, the following additional items should be given particular attention. Refer to the Hitachi Service Handbook for Packaged Air Conditioners, if required.
- Page 40 Replacement of parts should be performed by ordering from the HITACHI Parts List. When part replacement becomes necessary, prepare the parts given in the Parts List or the equivalent, as specified in the HITACHI Recommended Spare Parts List. Do not replace with spare parts which are not equivalent.
- Page 41 MAINTENANCE Table 5. Test Running and maintenance Record MODEL: RAS- 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.
- Page 42 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 Single-Phase...
- Page 43 TROUBLESHOOTING Insufficient Cooling Insufficient Cooling Cycling ON Compressor Cycling High Discharge Pressure or Operating ---------------------------- See ”High Discharge Pressure” or Low Suction Pressure ”Low Suction Pressure” Tripped High or Low ---------------------------- Repair the Clogging and Clogged Capillary of Pressure Switch Pressure Switch Replace the Switch if Required ---------------------------- Repair or Replace if Required...
- Page 44 TROUBLESHOOTING High Suction Pressure High Suction Pressure Excessive Fresh Air Intake -----------------------------Reduce the Fresh Air Intake High Evaporator Air Inlet Temperature -----------------------------Reinforce the Duct Insulation Insufficient Duct Insulation Defective Compressor Valve -----------------------------Replace or Repair the Compressor -----------------------------Charge Correct Refrigerant Quantity Overcharged Refrigerant -----------------------------See ”High Discharge Pressure”...
- Page 45 65MP3196...