Mitsubishi Electric PUH-P8YE Technical & Service Manual Download Page 42

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[7] Emergency operation

1) When the following check displays occur at the outdoor unit, or when the wired remote controller or indoor unit

microcomputer fails, if there are no other defects, emergency operation is possible by shorting the connector (CN31)

on the outdoor controller board.

•

Abnormalities that allow emergency operation

2) Check items and precautions when performing emergency operation

In addition to the abnormalities above, check the outdoor unit for any abnormalities. (When there is an abnor-

mality other than the above, emergency operation is impossible.)

Check the operating range. (For U4 display)

Since the outdoor fan always operates at full speed at emergency operation, do not operate the air conditioner

outside the range shown below.

Operation outside this range may cause com-

pressor trouble.

When performing emergency operation, set the outdoor unit after setting the emergency operation switch (SWE)

on the indoor controller board. For the indoor emergency operation method, refer to the indoor unit wiring

diagram.

A power failure causes emergency operation to become continuous operation. ON/OFF, temperature adjust-

ment and other operations cannot be performed from the remote controller.

(When a PEH-P8YE or P10YE indoor unit is connected, check that the special indoor unit power is turned on,

then start emergency operation.)

Since cool air is discharged from the indoor unit, when the outdoor unit starts the defrosting operation during

heating emergency operation, do not operate the air conditioner for a long time.

You can perform cooling emergency operation up to 10 hours. The indoor unit heat exchanger may freeze.

At the end of emergency operation, always return the switch settings, etc. to their original state.

3) Emergency operation contents

The operation mode operates according to the contents set (cooling or heating) by SW4-2.

The fan operation condition is always 100 % operation.

The operation mode display flashes every other second.

Display

Check contents

Liquid temp thermistor (TH1) open or shorted

Condenser/evaporater temp thermistor (TH3) open or shorted

Indoor-outdoor communication receive abnormal (outdoor unit)

Indoor-outdoor communication send abnormal (outdoor unit)

E0 - E7

Communication other than outdoor unit abnormal

Operation range (outdoor unit intake temperature)

Cooling

geater than 20

Heating

less than 10

Summary of Contents for PUH-P8YE

Page 1: ...TECHNICAL SERVICE MANUAL PUH P8YE PUH P10YE 2000 Single and Twin Triple Four Models AIR COOLED HEAT PUMP TYPE PACKAGED AIR CONDITIONERS For use with the R407 Outdoor unit ...

Page 2: ...Operation Data 13 2 Cooling Capacity Curves 14 3 Heating Capacity Curves 14 4 Capacity Reduction Ratio due to Changes in Piping Length 15 5 Center of Gravity Outdoor unit 16 6 NC Curve Outdoor unit 17 6 6 6 6 6 SERVICE DATA 18 1 Appearance of Equipment 18 2 Refrigerant Circuit 20 3 Limitation of Refrigerant Piping Length 20 4 Refrigerant Piping 21 5 Refrigerant Charge 21 6 Operation Rage 21 7 7 7 ...

Page 3: ...tion of the refrigerant in the cylinder will change and performance may drop Do not use a refrigerant other than R407C If another refrigerant R22 etc is used the chlorine in the refrigerant may cause the refrigerator oil to de teriorate Use a vacuum pump with a reverse flow check valve The vacuum pump oil may flow back into the refriger ant cycle and cause the refrigerator oil to deteriorate Do no...

Page 4: ... Both ends of the pipes should be sealed until immediately before brazing Wrap elbows and T s in plastic bags for storage The new refrigerator oil is 10 times more hygroscopic than the conventional refrigerator oil such as Suniso Water infiltration in the refrigerant circuit may deteriorate the oil or cause a compressor failure Piping materials must be stored with more care than with the conventio...

Page 5: ...ons Use only the necessary minimum quantity of oil Reason 1 The refrigerator oil used for the equipment is highly hygroscopic and may introduce water inside Notes Introducing a great quantity of mineral oil into the refrigerant circuit may also cause a compressor failure Do not use oils other than ester oil ether oil or alkylbenzene ...

Page 6: ...elt on upper part of cylinder Vacuum pump Vacuum drying Current product Can be used by attach ing an adapter with a check valve Vacuum pump with a check valve Current product Flare tool Flaring of pipes Current product Bender Bending of pipes Current product Application oil Applied to flared parts Current product Ester oil or Ether oil or Alkybenzene Small amount Torque wrench Tightening of flare ...

Page 7: ...o flux when brazing between copper pipes or between a copper pipe and copper coupling 4 If installed refrigerant pipes are not immediately connected to the equipment then braze and seal both ends of them Reasons 1 The new refrigerant oil is 10 times more hygroscopic than the conventional oil The probability of a machine failure if water infiltrates is higher than with conventional refrigerant oil ...

Page 8: ...e refrigerant circuit when the vacuum pump power is turned off power failure It is also possible to attach a check valve to the actual vacuum pump afterwards 2 Standard degree of vacuum for the vacuum pump Use a pump which reaches 0 5 Torr 500 MICRON or below after 5 minutes of operation In addition be sure to use a vacuum pump that has been properly maintained and oiled using the specified oil If...

Page 9: ...407C is a mixture of 3 refrigerants each with a different evaporation temperature Therefore if the equipment is charged with R407C gas then the refrigerant whose evaporation temperature is closest to the outside temperature is charged first while the rest of refrigerants remain in the cylinder Note In the case of a cylinder with a syphon liquid R407C is charged without turning the cylinder up side...

Page 10: ...Power input kW Current A Type x Quantity Fan Airflow rate m3 min Motor output kW Type Compressor Motor output kW Crankcase heater kW Refrigerant Lubricant External finish External dimension mm High pressure protection MPa Compressor Fan Refrigerant piping diameter Liquid Gas mm Indoor unit Noise level dB A Net weight kg Operating temperature range Notes 1 Cooling Heating capacity indicates the max...

Page 11: ...kW Current A Type x Quantity Fan Airflow rate m3 min Motor output kW Type Compressor Motor output kW Crankcase heater kW Refrigerant Lubricant External finish External dimension mm High pressure protection MPa Compressor Fan Refrigerant piping diameter Liquid Gas mm Indoor unit Noise level dB A Net weight kg Operating temperature range Notes 1 Cooling Heating capacity indicates the maximum value a...

Page 12: ...kout hole 215 Accessory Refrigerant gas conn pipe 1 pc The connecting pipe is fixed with the unit Packing for conn pipe 1 pc Attached near the ball valve Conduit mouting plate Painted the same color as the unit body ø40 ø33 ø27 each 1pc Tapping screw 4 10 4 pcs 1490 215 Note1 Note Please leave a space under the outdoor unit for the piping When you connect the piping from the bottom Please be caref...

Page 13: ...F1 F20 F10 4 F01 5P CN51 21S4 Blue Black White S1 S2 S3 Red Black White Red N F BOARD Green Yellow Controller Box Power source 3N 380 400 415 V 50 Hz TB3 TB1 Unit body To indoor unit PUH P10YE PUH P8YE SW5 1 ON OFF 4 SW5 1 ON OFF 4 4 OFF ON 1 4 OFF ON 1 NOTE SW5 4 IS OFF IN CASE OF PUH P8YE SW5 4 IS ON IN CASE OF PUH P10YE Symbol Explanation Symbol Name FUSE 15A 250VAC CLASS T FUSE 6 3A 250VAC CLA...

Page 14: ...P10YE 2 System Indoor units Distributor Remote controller Outdoor unit Pipe work Transmission line 3 core cable Distributor Remote controller Outdoor unit Pipe work Transmission line 3 core cable Indoor unit Remote controller Outdoor unit Pipe work Transmission line 3 core cable Indoor units Twin Triple Single Single 8HP j 10HP j 50 50 4HP 4HP j j j j j 5HP 5HP j j j j SDD 50WSA E 33 33 33 2 5HP 2...

Page 15: ...it Electrical characteristics 380 400 415 380 400 415 50 50 50 50 50 50 27 19 27 19 27 19 20 20 20 35 35 35 7 6 7 6 7 6 7 5 7 5 7 5 7 5 7 5 7 5 7 4 7 4 7 4 7 4 7 4 7 4 16 0 16 0 16 0 15 4 15 4 15 4 9 02 9 02 9 02 8 62 8 62 8 62 14 9 14 9 14 9 14 3 14 3 14 3 1 1 1 1 1 1 1 1 1 1 1 1 1 64 1 64 1 64 1 64 1 64 1 64 0 94 0 94 0 94 0 94 0 94 0 94 2 22 2 22 2 22 1 75 1 75 1 75 0 50 0 50 0 50 0 38 0 38 0 3...

Page 16: ...1 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 22 20 18 16 0 7 0 9 1 1 1 22 Input ratio Outdoor air temp CDB Indoor inlet air wet bulb tem p CW B 12 10 8 6 4 2 0 2 4 6 8 10 12 14 16 18 15 20 25 0 6 0 8 1 1 2 1 4 Capacity ratio Outdoor air temperature CWB Indoor inlet air dry bulb temperature CDB 12 10 8 6 4 2 0 2 4 6 8 10 12 14 16 18 25 20 15 0 6 0 8 1 1 2 1 4 Input ratio Outdoo...

Page 17: ... length m Actual piping length m 0 47 Number of bend PUH P10YE Equivalent piping length m Actual piping length m 0 5 Number of bend 6 1 0 4 0 98 2 0 88 0 0 85 2 0 86 4 0 89 6 0 92 8 0 92 10 0 92 4 Reduction ratio by frosting Outdoor unit inlet wet bulb temperature Heating capacity reduction ratio CWB Capacity ratio Equivalent piping length m 0 10 20 30 40 50 60 70 0 8 0 9 1 PUH P8YE Capacity ratio...

Page 18: ...t be durable against unit weight For the lifting of unit for movement please be sure to suspend at four points and not to give any shock to unit Never apply two point lifting as it is dangerous Use pads properly to prevent the scratching of external panel caused by contact with sling Fasten here properly to prevent unit from slipping off from the sling at lifting Lift unit slowly by suspending rop...

Page 19: ... Sound pressure level in anechoic room Measurement condition Measurement condition 63Hz 63 125Hz 60 250Hz 56 500Hz 56 1000Hz 51 2000Hz 47 4000Hz 44 8000Hz 40 dB 63Hz 63 125Hz 59 250Hz 56 500Hz 55 1000Hz 50 2000Hz 45 4000Hz 42 8000Hz 39 dB 1m 1m A B 1m 1m A B NC60 NC50 NC40 NC30 NC20 Approximate minimum audible limit on continuous noise 70 60 50 40 30 20 63 125 250 500 1000 2000 4000 8000 10 OCTAVE...

Page 20: ...oved MAIN BOARD Power source terminal block Terminal block for outdoor indoor control wiring connection N F BOARD F C BOARD Over current relay 51C Magnet contactor for compresser 52C Transformer Ball valve for refrigerant piping connection Liquid side Flare Ball valve for refrigerant piping connection Gas side Flange Electrical parts Box Outdoor unit heat exchanger Compresser ...

Page 21: ...H3 Check joint high pressure Solenoid valve SV1 Electric expansion valve LEV 4way valve Pressure switch 63H2 Pressure switch 63H1 Thermistor Discharge temp TH2 Thermistor Liquid temp TH1 Accumulater At the back of the heat exchanger panel header cover When this screw is removed the header cover is removed ...

Page 22: ...rt Muffler Compressor Solenoid valve Service port Strainer Ball valve Service port High pressure switch Control Indoor units Strainer PUH P8 10 PUH P8 10 H h L R a R b R c H L H h L R a R b R c R d PUH P8 10 L 50 m H 40 m L Ra Rb 70 m L Ra L Rb 50 m Ra Rb 8 m H 40 m h 1 m L Ra Rb Rc 70 m L Ra L Rb L Rc 50 m Ra Rb Rb Rc Rc Ra 8 m H 40 m h 1 m L Ra Rb Rc Rd 70 m L Ra L Rb L Rc L Rd 50 m Ra Rb Rb Rc ...

Page 23: ... air temperature CWB 27 15 Indoor air temperature CDB Additional refrigerant charge 0 05 L 0 026 Ra Rb Rc Rd 0 5 amount of indoor units kg 0 05 L 0 026 Ra Rb Rc Rd 0 5 amount of indoor units kg Amount of infusion of coolant at ex factory R407C 6 0 kg R407C 6 5 kg L Main section actual length Ra Rb Rc Rd Join section actual length The value of calculation result at the second decimal place must be ...

Page 24: ...inal block Semiconductor relay Semiconductor relay Over current relay Magnetic contractor 4 way valve LEV solenoid valve crankcase heater Key input LCD Send receive Louver Vane Drain pump Others Communication circuit Communication circuit Transformer Fan control Fan control Compressor Outdoor fan Indoor fan Indoor outdoor connection terminal block Indoor outdoor connection terminal block Current d...

Page 25: ...ing within 3 minutes 3 The 4 way valve is always ON during heating except during defrosting In other modes it is OFF However when the operation mode was changed from heating to stop the 4 way valve is turned off 10 minutes after the compressor was stopped 4 While the compressor is stopped the crankcase heater remains ON OFF while the compressor is operating 5 When the operation mode is changed whi...

Page 26: ...g to cooling the fan step conforms to item 2 5 Two minutes after the fan is started the fan step number of units is controlled every 30 seconds based on the piping temperature TH1 6 When TH1 reaches 50 C or higher or when the control high pressure switch 63H2 tripped the fan output becomes 100 7 Fan output while the compressor is operating is within the 20 to 100 range FAN step The following expre...

Page 27: ...1 initial setting 50 minutes and the piping temperature TH1 is below 10 C 2 When the integrated compressor operation time has exceeded 30 minutes and the piping differential tempera ture is TH1 8 TH1 10 C Piping differential temperature TH1 TH10 TH1 2 The defrosting prohibit time T1 is set as following based on the defrosting time T2 Note T1 is reset at the end of defrosting or by cooling ON comma...

Page 28: ...2200 pulse down output 60 pulses up is output c Sixty pulses up output ends initial processing At this point the valves are fully closed 2 Control contents At compressor starting At compressor stopping At defrosting Normal LEV output opening angle Initial opening angle 1000 pulses 2000 pulses full close See next item Opening angle control range Approx 1000 to 2000 pulses 1000 to 1500 pulses 3 Norm...

Page 29: ...ed Training Kind of switch DIP SW Pole 1 2 3 4 5 6 1 Trial run performs trail run processing by input change while stopped For details see the trail run section 2 Mode input is entered by SW3 OFF ON change ___ Press and hold down SW3 for about 2 seconds The set mode can be registered according to the outdoor unit setting information on page 31 2 Switch functions at set mode change Note After chang...

Page 30: ...Heating d Defrost Units digit Relay output PUH P8YE P10YE Display Check contents at power on E8 Indoor outdoor communication receive abnormal outdoor unit E9 Indoor outdoor communication send abnormal outdoor unit EA Indoor outdoor connection erroneous wiring number of indoor units mismatch Eb Indoor outdoor connection erroneous wiring indoor unit power failure disconnection Ed Serial communicatio...

Page 31: ...played alternately Example When 115 every other second 1 15 0 100 When 100 or higher 100s digit and 10s and units digits are displayed alternately Example When 100 every other second 1 00 0 999 When 100 or higher 100s digit and 10s and units digits are displayed alternately Example When 425 every other second 4 25 0 999 When 100 or higher 100s digit and 10s and units digits are displayed alternate...

Page 32: ... mode when abnormally stopped Example Comp only ON at cooling operation C4 39 88 When 0 C or lower and temperature are displayed alternately Example When 15 every other second 15 0 216 When 100 or higher 100s digit and 10s and units digits are displayed alternately Example When 130 every other second 1 30 When no abnormality history 0 When no abnormality history 0 0 999 When 100 or higher 100s dig...

Page 33: ...ation 2 Indoor unit piping temperature TH2 Indoor 1 39 88 Indoor unit piping temperature TH2 Indoor 2 39 88 Indoor unit piping temperature TH2 Indoor 3 39 88 Indoor unit piping temperature TH2 Indoor 4 39 88 Indoor intake tem perature 8 39 5 Indoor set temperature 17 30 Code display Code display C C C C C C OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 SW2 setting Dis...

Page 34: ...her 100s digit and 10s and units digits are displayed alternately Example When 100 every other second 1 00 1 5 C C C SW2 setting Display contents Description of display Unit Indoor unit No 1 Indoor unit No 3 Indoor unit No 2 Indoor unit No 4 Control mode Indoor unit Ordinary Hot adjustment Defrosting Heater ON Freeze prevention Surge prevention Compressor OFF Display 0 1 2 3 4 5 6 7 Outdoor unit C...

Page 35: ...r TH2 3 Outdoor condenser evaporater temp thermistor TH3 No abnormal thermistor 0 100 When 100 or higher 100s digit and 10s and units digits are displayed alternately Example When 100 every other second 00 0 400 When 100 or higher 100s digit and 10s and units digits are displayed alternately Example When 200 every other second 2 00 39 88 When 0 C or lower and temperature are displayed alternately ...

Page 36: ...every other second 2 45 1 5 39 88 When 0 C or lower and temperature are displayed alternately When there are no indoor units 00 is displayed 39 88 When 0 C or lower and temperature are displayed alternately When there are no indoor units 00 is displayed 39 88 When 0 C or lower and temperature are displayed alternately When there are no indoor units 00 is displayed 39 88 When 0 C or lower and tempe...

Page 37: ...e with a multimeter Ambient temperature 10 C to 30 C Measure the resistance value across the terminals with a multimeter Winding temperature 20 C Measure the resistance value across the terminals with a multimeter Winding temperature 20 C Normal 4 3 kΩ 9 6 kΩ 160 kΩ 410 kΩ Abnormal Open or short Based on thermistor characteristic table next page TH1 3 TH2 White Blue Black Normal 22 8 Ω Abnormal Op...

Page 38: ...7 kΩ 20 C 6 4 kΩ 25 C 5 3 kΩ 30 C 4 3 kΩ 40 C 3 1 kΩ 1 1 273 t 273 50 40 30 20 10 0 20 10 10 20 30 40 50 0 25 20 15 10 5 0 90 100 110 120 Resistance High temperature thermistor Thermistor Discharge temperature detection TH2 Thermistor Discharge temperature detection TH2 Thermistor R120 7 465 kΩ 2 B constant 4 057 kΩ 2 Rt 7 465 exp 4 057 20 C 250 kΩ 70 C 34 kΩ 30 C 160 kΩ 80 C 24 kΩ 40 C 104 kΩ 90 ...

Page 39: ...hite Red Orange Blue Brown Yellow Brown Red Blue Yellow White Connector Outdoor controller board CN40 Drive circuit Output phase No ø1 ø2 ø3 ø4 Output state 1 2 3 4 ON OFF OFF ON ON ON OFF OFF OFF ON ON OFF OFF OFF ON ON LEV opening and closing operations When the power is turned on to register the valve posi tion a 2200 pulses valve close signal is output and is al ways set to point A If the valv...

Page 40: ...s the valve assembly of the valve body up and down and controls the flow by changing the distance between the orifice and the bottom end of the valve Trouble mode Microcomputer drive cir cuit faulty LEV mechanism locked LEV motor coil open or shorted Connector connection in correct or contact faulty Judgment method 1 Disconnect the control circuit board connector and con nect the check LED shown b...

Page 41: ...t unit in the motor removed state dry the bellows section by performing the cooling operation for 30 minutes 4 6 Remove the cap of the replacement motor and butt the bottom of the motor against the top of the valve body and hold it so that both are aligned and connect the motor to the valve body with the lock nut Coat the entire periphery of the threaded part with screw lock Be sure that the screw...

Page 42: ...become continuous operation ON OFF temperature adjust ment and other operations cannot be performed from the remote controller When a PEH P8YE or P10YE indoor unit is connected check that the special indoor unit power is turned on then start emergency operation 5 Since cool air is discharged from the indoor unit when the outdoor unit starts the defrosting operation during heating emergency operati...

Page 43: ...that emergency operation starts and that operation mode display flashes Set operation mode cooling or heating with SW4 2 on outdoor board SW4 1 not used SW4 Cooling Heating OFF ON 1 2 NO YES 1 When PEH P8YE or P10YE indoor unit is con nected first turn off the outdoor unit power then turn off the indoor unit power Turn off mains power Outdoor indoor 1 1 Turn on mains power 5 Turn off emergency ope...

Page 44: ... diam eter or wiring length outside specifica tion 3 Five or more indoor units connected to outdoor unit 4 Outdoor controller board send receive circuit faulty 5 Indoor controller board send receive circuit faulty 6 Noise has entered on power supply or indoor outdoor connection wire 1 Indoor outdoor connection wire contact faulty or erroneous wiring 2 Indoor outdoor connection wire diam eter or wi...

Page 45: ...r controller board faulty 1 Overload operation exceeding unit us age range limit 2 Power supply terminal voltage low 3 Power supply missing phase 4 Compressor motor faulty 5 Compressor locked 6 Connector CN22 on outdoor control ler board dislodged or contact faulty 7 51C disconnected or contact faulty 1 Started with ball valve closed 2 Connector CN21 on outdoor control ler board dislodged or conta...

Page 46: ... board open or contact faulty 3 63L disconnected or contact faulty 4 Part faulty 1 Remote controller send receive circuit faulty 2 Refrigerant address 0 indoor control ler board send receive circuit faulty 3 Noise entered on remote controller transmission line 1 Remote controller send receive circuit faulty 2 Noise entered on remote controller transmission line 1 Indoor outdoor connection wire con...

Page 47: ...1 Thermistor characteristics faulty 2 Connector contact faulty Insertion faulty 3 Drain sensor wiring open or contact faulty 4 Indoor controller board faulty Judgment method and remedy 1 3 Check thermistor resistance value 0 C 15 0 kΩ 10 C 9 7 kΩ 20 C 6 4 kΩ 30 C 5 3 kΩ 40 C 3 1 kΩ Open or faulty contact can be detected by applying force pulling bending to lead wire while measuring thermistor re s...

Page 48: ...ter waves created by transmis sion of drain water from lead wire clogged filter etc 4 Indoor controller board faulty 1 Water leaking from humidifier water supply pipe 2 Water droplets on drain sensor 3 Indoor controller board faulty Cool and dry 1 Filter is clogged insufficient air flow 2 Air duct short cycle 3 Low load operation low temperature exceeding allowable range 4 Indoor fan motor faulty ...

Page 49: ...ler or an other indoor controller board even once in 3 minutes an abnormal ity is recognized 2 When the indoor controller board can not receive signals even once in 2 minutes an abnormality is recognized Cause 1 Indoor intake piping thermistor tem perature differential small EInsufficient refrigerant EPiping thermistor holder dislodged ERefrigerant circuit faulty 2 Extension piping When multiple u...

Page 50: ...pter is con nected to CN32 on indoor controller board Air conditioner is connected to MELANS and is set to local operation prohibit mode from centralized control ler etc 3 Cause of item 2 1 Insufficient refrigerant 2 Filter clogged 3 Outdoor unit heat exchanger clogged 4 Air duct short cycle 5 Outdoor unit bypass circuit faulty Symptom judgment and remedy 1 Check LED2 on indoor controller board 1 ...

Page 51: ...unit bypass circuit faulty Symptom judgment and remedy 1 Since the discharge temperature rises when there is leakage judge by measuring the tem perature Check piping connections etc for gas leak age 2 Check heat insulation 3 Open intake grille and check filter Clean filter and remove dust and dirt 4 Since the indoor piping temperature and out let pressure rise when the heat exchanger is clogged ju...

Page 52: ... minutes EA after 4 minutes Eb after 4 minutes EA after 4 minutes Eb after 4 minutes EA after 4 minutes Eb after 4 minutes EA after 4 minutes Eb after 4 minutes EA after 4 minutes Eb after 4 minutes EA after 4 minutes Eb after 4 minutes EA after 4 minutes Eb after 4 minutes LED1 On Off Off On On Off Off On Off On Off Off Off Off Off On On LED2 On Off Off Off On Off Off Off Off Off Off Off Off Off ...

Page 53: ...ced Starting at least 12 hours before the test run send current through the crankcase heater If the current is running for a shorter period of time damage to the compressor could result After the above checks are complete carry out the test run as indicated in the following outline 2 Starting and finishing the test run Procedure from the indoor unit carry out the test run as in the manual provided...

Page 54: ...mp thermistor Open short in liquid temp or condenser evaporater temp thermistor Compressor overcurrent interruption 51C operation High pressure error 63H1 operation Low pressure error 63L operation Power synchronous idle circuit error Inlet sensor error Piping sensor error Drain sensor error Drain overflow protector operation Water leak error PDH only Freeze prevention operation Surge prevention o...

Page 55: ...re displayed in alter nation Depending on the position of the SW2 switch on the outdoor unit board the segments light up to indicate the running condition of the unit and the particulars of the check code SW2 setting 123456 000000 011110 010110 110110 011100 111100 1 Display system for error indicator The indicator corresponds to the following numbers 0 Outdoor unit 1 Indoor unit No 1 2 Indoor uni...

Page 56: ...ISO ISO 9001 certifies quality warranties based on the design development production installation and auxiliary services for products built at an authorized plant The Air Conditioning Refrigeration SystemsWorks acquired environmental management system standard ISO 14001 certification The ISO 14000 series is a set of standards applying to environmental protection set by the International Standard O...

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