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ELECTRICAL WIRING 

3. ELECTRICAL WIRING

Tools and Instruments 

 

One set of wiring tools, 

electrical tester (Clamp meter). 

Schedule Check 

 

Confirm that the field selected 

electrical  components  (main  power  switch, fuses, 
wires,  conduit  connections,  wire  terminals)  are 
properly  selected  and  ensure  that  they  comply 
with national  and  local  codes.  It  is  recommended 
that the main power switch be locked at the OFF 
position,  to  prevent  against  accidental  supply  of 
the power during unit servicing. 

Service  Panel 

 

Access  to  the  magnetic  switch 

box  is  provided  from  the  service  panel,  which  is 
fixed  with  screws  (see  the  panel  location  in  the 
Operation Instructions.) 

3.1 Main Power Wiring Procedures 

Confirm that electrical power is not being supplied 
to  the  installation  location  prior  to  any  electrical 
installation work. 

1. Install the field-supplied main switch box at the 

properly selected location. 

2. Install conduit connectors in the hole for power 

wiring (knockout holes). 

3.  Lead  the  main  power  wires  and  the  earthing 

wire  through  the  connector  to  the  screw 
terminals  for  main  power  and  earthing  in  the 
magnetic switch box. The  neutral  wire to  220V   
power  supplies  should  also  be  led  through  the 
connector.  Firmly  connect  the  wires  with  wire 
terminals  to  the  unit  screw  terminals  R(L1), 
S(L2)  and  T(L3)  for  220V  power  supplies 
according to Fig. 6 or the wiring label attached 
to the magnetic switch box. 

 

A  scroll  compressor  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  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  power 
source  to  the  main  terminals  of  the  unit  as 
indicated  with dotted lines, and then check the 
rotation  direction  of  the  phase  sequence 
indicator  once  again.  Do  not  exchange  the 
wires  in  the  unit  in  order  to  protect  the 
compressor against the reversal rotation. 

 

           

R

S

T

Unit Side

 

(2) Do not operate the compressor by depressing 

the  button  of  the  magnetic  switch  for  the 
compressor. 

A  three-phase  condenser  fan  motor  is  equipped; 
therefore,  the  fan  motor  rotation  should  be 
checked. Interchange two of the three main power 
source  wires,  if  incorrect  rotation  is  detected 
during initial start-up. 

3.2 Control Wiring 

Install  the  optional  room  thermostat  at  a  suitable 
location  in  the  space  to  be  air-conditioned. 
Connect  the  control  wires  between  the  unit 
terminals  and  the  thermostat  terminals  according 
to Fig. 6 or the wiring label.   

 

Fig. 6. Field Wiring Connection

Terminal

Main Power

L2

S

Earth Terminal

Wiring

Power

Main

(Field Supplied)

Switch

Main
Power 

SL

L1

R

Control

(Utilize Connectors

Five (5) Wires for
Cooling Operation

Terminal

Circuit

L3

T

A

D

B

F

E

A,B,D,E and F)

Room Thermostat

Unit

(Field Supplied)

 

          Fig. 6. Field Wiring Connection 

 

Содержание RUA-13AT3S

Страница 1: ...STRUCTION MANUAL BEFORE USING THIS AIR CONDITIONER KEEP THIS MANUAL FOR FUTURE REFERENCE 65MP3156 SELF CONTAINED AIR CONDITIONERS Models RUA 13AT3S RUA 15AT3S RUA 20AT3S RUA 30AT3S Installation Operation and Maintenance INSTRUCTIONS MANUAL ...

Страница 2: ...afe practices which COULD result in minor personal injury or product or property damage Useful information for this operation and or maintenance If you have any questions contact your contractor or dealer of HITACHI This manual gives a common description and information for this air conditioner which you operate as well as for other models This air conditioner has been designed for the following t...

Страница 3: ...ECTRICAL WIRING 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 7 5 REMOVING SHIPPING WASHERS 8 6 TEST RUNNING 9 6 1 Final Installation Check 9 6 2 Preparation 9 6 3 Test Running 9 6 4 Test Running Record 10 6 5 Safety and Control Device Setting 11 7 MAINTENANCE 12 8 WINTER SHUTDOWN 13 9 REPLACEMENT OF PARTS 13 10 TROUBLESHOOT...

Страница 4: ...oes 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 remote con...

Страница 5: ...ground installation provide a gravel or concrete space around the condenser air intake in order 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...

Страница 6: ...e 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 in Fig 4 Lifting by Forklift Insert the forks under the base frames from the indicated direction in Fig 4 Lift the...

Страница 7: ...ons A field supplied 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 t...

Страница 8: ...ACHI 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 to check the correct wiring connection the utilization of a phase sequence indicator i...

Страница 9: ...s Mark Name of Parts CT1 Current Transformer for NO 1 Compressor DSW1 Dip Switch for Capacity Setting CT2 Current Transformer for NO 2 Compressor DSW2 Dip Switch for Optional Function Setting 1 CT3 Current Transformer for NO 3 Compressor DSW3 Dip Switch for Optional Function Setting 2 CN6 Connector for Transformer Input L M Terminal for Different Main Power Supply CN7 Connector for Transformer Out...

Страница 10: ...res Twice Incorrect Wiring Connection of Room Thermostat 1 Check wiring and connections between unit and thermostat Refer to 3 2 Control Wiring 3 Times Trip Detected of Safety Device 1 Check the current for indoor fan motor 2 Check the current for outdoor fan motor 3 Check the pressure of discharge and suction line Refer to 16 Troubleshooting 4 Check the internal thermostat of compressor 4 Times O...

Страница 11: ...urfaces 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 RUA 13AT3S and RUA 15AT3S For Models RUA 20AT3S through RUA 30AT3S Fig 7 Adjustable Motor Pulley Table 1 Fan Speed Adjustment Model Regulation Space X of Motor Pulley mm Factory Set Point RPM Turn 17 18 19 20...

Страница 12: ...f shipping washers refer to Fig 8 1 Before compressor starting remove the yellow painted shipping washers the compressor should float freely on the rubber isolators Fig 8 1 For Compressor Model 500DH The compressor Models 750EL and 1000EL are mounted on rubber isolators and have no shipping bracket refer to Fig 8 2 Fig 8 2 For Compressor Models 750EL and 1000EL ...

Страница 13: ...r and General Tools Preparation Confirm that the system switch on the room thermostat is at the OFF position Pressure Gauges Equip high and low pressure compound gauges according to Fig 11 Thermostat Set the thermostat at a lower temperature than the room temperature 6 3 Test Running Test running should be performed as follows when the unit is wired according to the HITACHI standard wiring label 1...

Страница 14: ...rt Delay Time Safety Devices Close Close Close Close Close Close Close Close Open Fig 9 1 Standard Operation Sequence NOTES 1 Field Supplied 2 For models RUA 13AT3S and RUA 15AT3S the No 1 condenser fan starts and stops at the same period at which the No 1 compressor starts and stops and No 2 condenser fan operates together the No 2 compressor 3 For models RUA 20AT3S and RUA 30AT3S non cycling con...

Страница 15: ...y Automatic Reset Non Adjustable 220V 60Hz A 32 41 41 52 60 Discharge Gas Thermostat Cut Out C 130 130 130 130 Cut In C 100 100 100 100 Crankcase Heater Capacity W 40 60 60 60 CCP Timer Non Adjustable For Compressor min 3 3 3 3 3 5 min 4 4 4 4 For Evaporator Fan Motor Manual Reset Adjustable Overcurrent Relay 220V 60Hz A 9 9 14 21 For Condenser Fan Motor Internal Thermostat Automatic Reset Non Adj...

Страница 16: ...ange or clean the filter if required The inspection interval may be determined by the operating conditions for each installation site Condensate Drain Pan and Drain Line Inspect and or clean the condensate drain line at least twice a year Evaporator Fan Check for a loosened fan belt and abnormal sounds Lubrication Compressor The compressors are charged at the factory with the correct oil and the c...

Страница 17: ... air nitrogen or refrigerant be charged for these types of tests 8 WINTER SHUTDOWN Winter shutdown When shutting down the unit for winter clean the inside and the outside of the cabinet and dry the unit especially the drain pan and the drain lines This unit shall be preferably covered during shutdown in order to protect it from dust and environmental conditions Spring Start Up After any extended s...

Страница 18: ... suction line Temperature and superheat Suction line Temperature C Superheat C 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 dev...

Страница 19: ...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...

Страница 20: ... 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...

Страница 21: ...Fixed 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 Cy...

Страница 22: ......

Страница 23: ......

Страница 24: ...65MP3156 Printed in Philippines ...

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