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Service Handbook
PUD-P250YMF-C
PFD-P250VM-A
PFD-P500VM-A
HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Issued in Jun. 2004 MEE03K207-A
Printed in Japan
New publication effective Jun. 2004
Specifications subject to change without notice.
AIR CONDITIONERS CITY MULTI
Service Handbook
< Outdoor unit >
Models
PUD-P250YMF-C
< Iutdoor unit >
PFD-P250VM-A
PFD-P500VM-A

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Summary of Contents for Mitsubishi CITY MULTI PUD-P250YMF-C

  • Page 1 < Outdoor unit > Models PUD-P250YMF-C < Iutdoor unit > PFD-P250VM-A HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN PFD-P500VM-A New publication effective Jun. 2004 Issued in Jun. 2004 MEE03K207-A Specifications subject to change without notice. Printed in Japan...
  • Page 2: Table Of Contents

    Contents Please Read Before Servicing the Unit 1 Check Before Servicing the Unit ..........[1] Find out the model type and refrigerant type of the unit to be serviced .. [2] Principal System Components ..........[3] Check the symptoms of the unit requiring service ....[4] Be sure to read Read Before Servicing at the beginning of this manual ..
  • Page 3 5 5 . Control 1 Dip Switch Functions and Factory Settings ........ 56 [1] Outdoor Unit ................56 [2] Indoor Unit ................57 2 Controlling the Outdoor Unit ............58 [1] Initial Control ................58 [2] Control at startup ..............58 [3] Bypass control ................
  • Page 4 8 8 . LED Monitor Display 1 How to Read the Service Monitor LED........115 [1] How to read the LED .............. 115 [2] Outdoor Unit Control LED Monitor.......... 116 9 9 . Test Run 1 Before a Test Run ................ 124 2 Test-Run Method................
  • Page 5 If leaked refrigerant gas is exposed to a heart source, such switch and temperature switch or using parts other than as fan heater, stove, and electric grill, noxious gases may those specified by Mitsubishi Electric may result in fire or form. explosion.
  • Page 6 Precautions for Devices that Use R407C Refrigerant Caution Do not use existing refrigerant piping. Use a vacuum pump with a reverse-flow-check valve. • The old refrigerant and refrigerator oil in the existing piping • If other types of valves are used, the vacuum pump oil will contain a large amount of chlorine, which will deteriorate flow back into the refrigerant circuit and deteriorate the the refrigerator oil in the new unit.
  • Page 7 Mitsubishi based on the Guidelines for the Quality of Water for Refrigeration and Air Conditioning established by the Japan Refrigeration and Air Use a closed circulating water circuit (which does not Conditioning Industry Association.
  • Page 8 Before Installing (Relocating) the Unit or Performing Electrical Work Caution Exercise caution when transporting products. Properly dispose of packing materials. • Do not try to move equipments over 20kg (approx. 44 lbs.) • Things such as nails and wood pieces may be included in alone.
  • Page 9: Please Read Before Servicing The Unit

    POWER RATING WEIGHT 2.11kg SERIAL No. MITSUBISHI ELECTRIC CORPORATION PAC-SC50KUA When using a PFD-P250VM-A as an indoor unit, connect an outdoor unit PUD-P250YMF-C to each indoor unit and operate with a built-in remote control for the indoor unit. ✻1: Bold line indicates refrigerant piping (gas/liquid). This system consists of one refrigerant circuit.
  • Page 10: Check The Symptoms Of The Unit Requiring Service

    [3] Check the symptoms of the unit requiring service. Refer to this service manual for problems related to Freezer Cycle. [4] Be sure to read Read Before Servicing at the beginning of this manual. [5] Prepare necessary tools. Do not use the same tools for units that use different types of refrigerant (especially gauze manifold and charge hose).
  • Page 11: Necessary Tools And Materials

    2 2 Necessary Tools and Materials Prepare the following tools and materials. Some of the tools should be marked for use only with units that use R407C refrigerant. [1] List of Tools and Materials Necessary for Units that Use R407C (and adaptability of tools that have been used with units that use R22) (1) To be used with R407C Only (not to be used if used with R22) Tools...
  • Page 12: Piping Materials

    3 3 Piping Materials Do not use the existing piping! New Piping Existing Piping Do not use the piping that have been used for R22. <Reason> A large amount of chlorine residues from conventional refrigerator oil and refrigerant found inside the existing piping deposit sludge in the new piping system.
  • Page 13: Storage Of Piping Materials

    4 4 Storage of Piping Materials [1] Storage Location Store the pipes to be used indoors (i.e. warehouse). Storing them outdoors may cause dirt, waste, or water to infiltrate. [2] Pipe sealing before storage Both ends of the pipes should be sealed until immediately before brazing. Wrap elbows and T’s in plastic for storage.
  • Page 14: Machining Pipes

    5 5 Machining Pipes Use a small amount of ester oil, ether oil, or alkylbenzene as refrigerator oil to coat flares and flange connections. Do not use oils other than ester oil, ether oil, or alkylbenzene. <Caution> Use only the smallest possible amount of oil necessary. - 13 -...
  • Page 15: Brazing

    6 6 Brazing Although there are no changes from the conventional method, special care must be taken to keep contaminants (i.e. oxide scale, water, dirt etc.) from entering refrigerant circuit. Example: Inside a brazed section Brazed with materials other than non-oxide Brazed with non-oxide brazing material brazing material <Items to be strictly observed>...
  • Page 16: Testing Air Tightness

    7 7 Testing Air Tightness There are no changes from the conventional method. Note that a refrigerant leak detector for R22 will not work for R407C. Halide Torch R22 Leak Detector <Items to be strictly observed> 1. Pressurize the equipment with nitrogen up to the design pressure, and then measure the equipment’s air-tight- ness, taking temperature variations into account.
  • Page 17: Vacuum Drying (Evacuating)

    8 8 Vacuum Drying (Evacuating) Photograph 1 Photograph 2 Photograph 1 Recommended Vacuum Gauge : ROBINAIR 14010 Thermistor Vacuum Gauge [1] Vacuum pump with a check valve (See photo 1) A vacuum pump with a check valve is required to prevent the vacuum pump oil from flowing back into the refrigerant circuit when the power supply is cut off unexpectedly due to power outage.
  • Page 18: Charging The Circuit With Refrigerant

    9 9 Charging the Circuit with Refrigerant R407C must be in a liquid state when charging the circuit because it is a non-azeotropic refrigerant. cylinder with a siphon cylinder without a siphon Cylinder Cylinder Cylinder color R407C-Brown Use liquid refrigerant Valve Valve Liquid...
  • Page 19 Caution The cylinders shown below are equipped with siphons. When using this type of cylinders, place the cylinder with the siphon facing up. Enlargement Valve Liquid R407C Cylinder with siphon: Manufactured by Asahi Glass - 18 -...
  • Page 20: What To Do When Refrigerant Leaks

    What to Do When Refrigerant Leaks As with conventional air-conditioning units, refrigerant can be added to what remains in the circuit, for the unit is equipped with a CS circuit (Circulating-Refrigerant-Composition-Detector) Refer to section X of this handbook for more information. ✻...
  • Page 21: 1 . Restrictions

    1 1 . Restrictions 1 1 System Restrictions and System Configuration Each unit of the Split-Type Air Conditioners for Computer Rooms comes as a part of a system. For each unit to be integrated into the system, the system requires a series of switch setting. Be sure to read the following to properly configure the system.
  • Page 22 (4) Example Below is a typical setting of a system Diagram Comments Switch Setting Outdoor Units Controller board Indoor Units ✻ There are two 1 Set indoor unit address controller boards G-50A using sequential numbers. inside indoor units. DC12V (for P500 type) (P500 only) Power supply...
  • Page 23: Restrictions On Transmission Lines

    2 2 Restrictions on Transmission Lines [1] Electrical Wiring (1) Attention 1 Follow ordinance of your governmental organization for technical standard related to electrical equipment, wiring regulations, and guidance of each electric power company. 2 Wiring for control (hereinafter referred to as transmission line) shall be (5cm or more) apart from power source wiring so that it is not influenced by electric noise from power source wiring.(Do not insert trans- mission line and power source wire in the same conduit.) 4 Give some allowance to wiring for electrical part box of indoor and outdoor units, because the box is...
  • Page 24 2 How to Use Conduit Mounting Plates Conduit mounting plates ( ø 27, ø 33, ø 40) are packaged with the unit. Use an appropriate plate depend- ing on the diameter of the wire used. Mount the plate as shown below. Use this hole when threading the wire through the bottom hole Use this hole when threading...
  • Page 25 (3) Control Wiring Transmission line is a type of control line. When the source of noise is located adjacent to the unit, the use of shield cable as well as moving the unit as far away from the noise source are recommended. 1 Transmission line (M-NET transmission line) System component For multiple-refrigerant system...
  • Page 26 1 Address setting This system requires address setting. The range of address varies depending on the type of unit. Refer to “(5) Examples” for details. Address Factory Unit Symbol Setting method setting range setting Assign a number to all indoor units, starting with 1 and using Main/sub 01~50 sequential numbers.
  • Page 27 Examples System Using MA Remote Controller (1) System with one indoor unit (10HP system) Control Wiring Diagram Use CN41 as is. ✻There is one indoor controller board inside indoor unit. TB5-1 A B S A B S TB15 A1 B2 Remarks Maximum Allowable Length <a.
  • Page 28 Wiring and Address Setting <a. Indoor/Outdoor Transmission Lines > Connect A, B terminals of indoor/outdoor transmission line terminal board (TB3) on the outdoor unit and A, B terminals of the Indoor/outdoor transmission terminal board (TB5). (Non-polar 2 wire) ✻ Only use shield line. [Grounding the shield line] Connect the earth terminal of the OC and S terminal of the IC terminal board (TB5).
  • Page 29 System Using MA Remote Controller (2) Unit with One Indoor Unit (20HP Systems) Control Wiring Diagram Replace CN41 with CN40. ✻There are 2 indoor controller boards inside indoor unit. TB5-1 A B S A B S Conect TB15 A1 B2 Use CN41 as is.
  • Page 30 Wiring and Address Setting <a. Indoor/Outdoor Transmission Lines > Connect A, B terminals of indoor/outdoor transmission line terminal board (TB3) on the outdoor unit and A, B terminals of the Indoor/outdoor transmission terminal board (TB5). (Non-polar 2 wire) ✻Only use shield line. [Grounding the shield line] Connect the earth terminal of the OC and S terminal of the IC terminal board (TB5).
  • Page 31 System Using MA Remote Controller (3) When connecting 2 MA remote controller to one indoor unit (20HP Systems) Control Wiring Diagram Replace CN41 with CN40 ✻There are 2 indoor controller boards inside indoor unit. TB5-1 A B S A B S Connect TB15 A1 B2...
  • Page 32 Wiring and Address Setting <a. Indoor/Outdoor Transmission Line > Same as (2). <b. Transmission Line for Centralized Control > Same as (2). <c. MA Remote Controller Wiring > [When using 2 remote controllers] When using two remote controllers, connect terminals 1 and 2 of TB15 on the indoor unit to terminal board of MA controller(option).
  • Page 33 System Using MA Remote Controller (4) When grouping 2 indoor units (20HP systems) with MA remote controller Control Wiring Diagram ✻There are two indoor controller board inside each indoor unit. Replace CN41 with CN40. Replace CN41 with CN40. TB5-1 TB5-1 A B S A B S A B S...
  • Page 34 Wiring and Address Setting <a. Indoor/Outdoor transmission line > Same as (2). <b. Transmission Line for Centralized Control > Same as (2). <c. MA remote controller line > ✻ When grouping units that use different refrigerants, set MA remote controller of one of the indoor units as sub controller.
  • Page 35 System Using MA Remote Controller (5) When grouping multiple indoor units (combination of 10HP, 20HP systems) Control Wiring Diagram ✻There is one indoor controller ✻There are two indoor controller board inside indoor unit. boards inside indoor unit. Use CN41 as is Replace CN41 with CN40.
  • Page 36 Control Wiring Diagram ✻There is one indoor controller ✻There are two indoor controller board inside indoor unit. board inside indoor unit. Use CN41 as is Replace CN41 with CN40. TB5-1 TB5-1 A B S A B S A B S A B S Connect TB15...
  • Page 37 System with MA remote controller and G-50A (1) System with multiple indoor units (10HP, 20HP) Control Wiring Diagram ✻There is one indoor controller ✻There are two indoor controller board inside indoor unit. boards inside indoor unit. Use CN41 as is. Use CN41 as is.
  • Page 38 Control Wiring Diagram ✻There is one indoor controller ✻There are two indoor controller board inside indoor unit. boards inside indoor unit. Use CN41 as is. Use CN41 as is. TB5-1 TB5-1 A B S A B S A B S A B S TB15 TB15...
  • Page 39: Restrictions On Refrigerant Pipe Length

    3 3 Restrictions on Refrigerant Pipe Length There are two types of refrigerant circuits: one with one refrigerant circuit and another with two refrigerant circuits. The former consists of refrigerant piping from one outdoor unit connected to an indoor unit (P250), and the latter consists of refrigerant piping from two outdoor units connected to an indoor unit (P500).
  • Page 40: 2 . Components Of The Unit

    2 2 . Components of the Unit 1 1 Internal Structure < PUD-P250YMF-C > Propeller fan Fan motor Heat exchanger(rear) Heat exchanger(front) Control box Compressor PUD-YMF-C Accumulator Drier Compressor - 39 -...
  • Page 41 < PFD-P250VM-A > (1) Front Heat exchanger ✕2 (front/back) Suction temperature thermistor Linear expansion valve (LEV) Main drain pan Drain hose Bearing Pipes (gas/liquid) Fan casing ✕ Pulley Fan motor Controller Remote V belt control Discharge temperature thermistor Bearing Base (Drain pan) (on the back of the controller) <Location of drain pan overflow detection float switch>...
  • Page 42 < PFD-P500VM-A > (1) Front Heat exchanger ✕2 (front:No. 1; back:No. 2) Suction temperature thermistor ✕2 Linear expansion valve (LEV) ✕2 Main drain pan Drain hose Pipes (gas/liquid) ✕2 Pulley ✕2 Fan motor Controller V belt Discharge Local temperature Bearing switch thermistor ✕2 Fan casing ✕2...
  • Page 43: Control Box

    2 2 Control Box < PUD-P250YMF-C > FANCON board INV board MAIN board Noise filter Choke coil (L2) Terminal block TB1A Power Source Terminal block TB7 Transmission (Centralized control) Terminal block TB3 Transmission Inteligent Power Module (IPM) G/A board Capacitor (C2, C3) (Smoothing capacitor) Diode stack (DS) Magnetic contactor (52C)
  • Page 44 <PFD-P250VM-A > ✻ Back of remote controller Relay Input/output Switch connector Address board Controller board (normal/local) (X11,Z1,Z3) Remote controller CN3T CN70 CN2M CN3A CN24 local Electro magnetic CN20 CN23 CN21 contactor CN42 CN29 CN81 CN60 (52F) CN25 CN31 normal Surge breaker 250V 250V 1A F...
  • Page 45: Main Board

    3 3 Main Board < PUD-P250YMF-C > Main Board CNVCC4 Power source for control(5V) CNTR CNFC1 CNS1 CNS2 CN40 CN41 CNVCC3 Power source for control(5V) 1-2 30V 1-3 30V 4-6 12V 5-6 5V CN51 Indication distance 3-4 Compressor ON/OFF 3-5 Trouble CNRS3 Serial transmission to INV board...
  • Page 46 INV Board CNVDC DC-560V CN15V2 Power source for IPM control CNVCC4 Power supply(5V) CNL2 Choke coil CNVCC2 Power supply for control(5V) 1-2 30V, 1-3 30V CN52C 4-6 12V, 5-6 5V Control for CNDR2 Out put to G/A board CNFAN CNTH Control for MF1 CNAC2...
  • Page 47 FANCON Board CNPOW CNFAN CNFC2 G/A Board CNDC1 CN15V1 CNIPM1 CNDR1 - 46 -...
  • Page 48 < PFD-P250,500VM-A > Indoor Control Board Power supply output Power supply input CN3T (to transformer) (AC 200V) CNV.CNP Power supply input F901 Lamp output (from transformer) Fuse CN70 Fan output LED2 CN24 CN2M Control signal Indoor unit output transmission line Thermistor input CN23 CN20...
  • Page 49 External Input/Output Circuit Board CN53 CN54 Indoor control board (No.1) Indoor control board (No.2) To CN51 To CN51 TB23 (Input with voltage) TB21 (Input no voltage) TB22 (Relay contact output) ON/OFF ON/OFF No.1 operation status No.1 error status No.2 operation status No.2 error status - 48 -...
  • Page 50: 3 . Electrical Wiring Diagrams

    3 3 . Electrical Wiring Diagrams 1 1 Outdoor Unit (1) PUD-P250YMF-C - 49 -...
  • Page 51: Indoor Unit

    2 2 Indoor Unit (1) PFD-P250VM-A - 50 -...
  • Page 52 (2) PFD-P500VM-A - 51 -...
  • Page 53: 4 . Refrigerant Circuit 1 Refrigerant Circuit Diagram

    4 4 . Refrigerant Circuit 1 1 Refrigerant Circuit Diagram < PUD-P250YMF-C > - 52 -...
  • Page 54: List Of Major Component Functions

    2 2 List of Major Component Functions (1) Outdoor Unit < PUD-P250YMF-C > Symbol Name Application Specification Check method (function) Compressor Adjust refrigerant circulation by Low pressure shell scroll type controlling operating frequency and with capacity control mechanism capacity control valve with operating Winding resistance: pressure.
  • Page 55 Symbol Name Application Specification Check method (function) =7.465kΩ =4057R =17 25/120 = 7.465exp{4057 273 + t 1) Detects compressor shell temperature TH10 Resistance check 20˚C 250kΩ 70˚C 34kΩ 2) Compressor overheating protection 30˚C 160kΩ 80˚C 24kΩ 40˚C 104kΩ 90˚C 17.5kΩ Thermistor 50˚C 70kΩ...
  • Page 56 (2) Indoor Unit < PFD-P250,500VM-A > Symbol Name Application Specification Check method (function) Continuity check with tester (Refer to checking) White-red-orange DC12V Yellow-brown-blue Electronic Opening of stemming motor Adjusts superheat at outdoor unit Expansion White driving valve heat exchanger outlet in cooling operation Valve 0~2000 pulses Orange...
  • Page 57: Dip Switch Functions And Factory Settings

    5 5 . Control 1 1 Dip Switch Functions and Factory Settings [1] Outdoor Unit < PUD-P250YMF-C > (1) Main Board Function according to switch operation Switch settig timing Switch Function Unit address setting. Set to numbers between 51 and 90 with the dial switch. Self-diagnosis/operation Refer to section VIII Display on the LED monitor on the outdoor unit board.
  • Page 58: Indoor Unit

    (2) Dip Switch (Control Board) Function according to switch Switch setting timing Switch Function · Above 20A immediately · Above 20A immediately before starting before starting IDC sensor error-detec- Anytime power on (Below 10A five seconds after start tion mode selection ·...
  • Page 59: Controlling The Outdoor Unit

    (2) Slide Switch (Address Board) Switch-Set Switch Function Function According to Switch Timing Thermo. ON/OFF Forced Thermo OFF Anytime after 1 ~ 3 (used by indoor units using Forced Thermo-OFF power on multiple refrigerants) Normal Control Option Factory Setting : Discharge Temp. Control Factory Setting Option : Suction Temp.
  • Page 60: Frequency Control

    <Example of SV1 operation> Compressor Bypass solenoid valve (SV1) Start Thermostat Thermostat Stop 2 minutes 30 seconds 2 minutes [4] Frequency Control ¡Depending on the capacity required, frequency is controlled to approximate evaporation temperature (Te) to the target evaporation temperature (Tem) during cooling operation. ¡Depending on the capacity required, the target evaporation temperature (Tem) changes as the following: ·...
  • Page 61: Oil-Return Control

    [5] Oil-Return Control · Oil-return LEV (SLEV) is determined by the operating capacity of the compressor and outside temperature. · During compressor stoppage and for 10 minutes after startup, the opening of SLEV is 75. · When the compressor is stopped, the opening of SLEV is 0. [6] Outdoor Unit Fan (1) Control Method ·...
  • Page 62: Emergency Operation Mode

    [9] Emergency Operation Mode Emergency Operation is an operation that is run at 50 to 70 percent of the system's maximum capacity when experiencing problems, depending on the type of problems listed below. It is automatically run after the follow- ing abnormalities have been detected.
  • Page 63: Control-Block Diagram

    Control-Block Diagram [11] · Thermistor · Relay · Float Switch · LEV · HA In · Fan Motor · Rotary Switch Indoor/Outdoor unit transmission line Indoor unit Address switch Compressor Centralized control unit transmission line operation signal Error signal Outdoor unit ·...
  • Page 64: Controlling The Indoor Unit

    3 3 Controlling the Indoor Unit < Indoor unit control > Inside the indoor units 16 and 20 HP are two control boards to accommodate two-refrigerant circuits, and there is one control board inside indoor unit 10HP to accommodate one-refrigerant circuits. Each refrigerant circuit is controlled independently.
  • Page 65: Actuator Control

    [2] Actuator Control (1) LEV Control · Depending on the condensation pressure, LEV control is set at a certain level at start-up. · After the start-up, the degree of LEV opening is adjusted every minute to keep within a certain range the superheat detected by Thermistors TH22 (liquid) and TH23 (gas) in the indoor unit.
  • Page 66: Three-Minute Restart-Suspension Mode

    Miscellaneous ¡ When encountering problems other than the ones listed above, the system, except for the fan (unless problems are found with the fan-in which case the fan will also stop), will stop. ¡ When problems are found in only one of the two units of a 2-refrigerant circuit, only the unit with problems will run an emergency operation or stop its operation, while the other unit will keep running its normal operation.
  • Page 67: Operation Flow Chart

    4 4 Operation Flow Chart [1] Mode Selection Flow Chart (1) Indoor Unit (Cooling Mode) Normal oper ations Start Abnormal operations At stoppage Breaker on From indoor unit Operation SW on 1. Self-holding of protection function released 2. Indoor LEV fully open Note 2 Remote controller off Error mode...
  • Page 68 (2) Outdoor Unit (Cooling Mode) Normal oper ations Start Abnormal operations At stoppage Breaker trip Note 1 System startup completed (Approx. 1 minute) From indoor unit Operation command 1. Self-holding of protection function released 2. SLEV, LEV1 fully open (outdoor unit) Operation mode Cooling...
  • Page 69: Operation In Each Mode

    [2] Operation in each Mode (1) Cooling Operation Cooling operation Normal operations 4-way valve OFF Test run Stop Indoor unit fan operations Test run start Thermostat ON 3-minute restart prevention 1. Inverter output 0Hz 1. Inverter frequency control 2. Indoor unit LEV, Subcool coil 2.
  • Page 70: 6 . Refrigerant Amount Adjustment 1 Operating Characteristics And Refrigerant Amount

    6 6 . Refrigerant Amount Adjustment 1 1 Operating Characteristics and Refrigerant Amount It is important to understand the relationship between refrigerant amount and operation characteristics. Use the fol- lowing information when adjusting refrigerant amount. [1] Operating Characteristics/Refrigerant Amount During cooling operations, the demand for refrigerant tends to increase in proportion to an increase in the number of operating indoor units (refrigerant in the accumulator decreases), though the change is small.
  • Page 71: Amount Of Refrigerant To Be Added

    (2) Checking refrigerant Volume Using LED Set Self-Diagnosis Switch (SW1) as shown and check the history of operation regarding refrigerant. 1 2 3 4 5 6 7 8 9 10 Set SW1 as shown on the right When LED 8 lights up: It indicates that the unit is close to being stopped due to overfilling of refrigerant.
  • Page 72: Refrigerant-Adjustment Operation Mode

    3 3 Refrigerant-Adjustment Operation Mode Procedures described in this unit is meant to be used on a first-aid basis, as it is difficult to accurately adjust refrig- erant volume. Using the flow chart in the following section, determine if the unit has an adequate amount of refriger- ant.
  • Page 73 < Air-Cooling Outdoor Unit > Start Note Run indoor units in test cooling mode 6 minutes after start-up? Gradually add refrigerant from 115˚C? low-pressure service port At least 2 hours have past since At least 2 hours have past since the unit was turned on OR the unit was turned on OR The unit has continuously been running...
  • Page 74: 7 . Troubleshooting 1 List Of Check Code

    7 7 . Troubleshooting 1 1 List of Check Code Check Code Check Content 0403 Serial transmission abnormality 0900 Trial operation 1102 Discharge temperature abnormality 1111 Low pressure saturation temperature sensor abnormality (TH2) 1112 Low pressure saturation Liquid level sensing temperature sensor abnormality (TH4) 1113 temperature abnormality Liquid level sensing temperature sensor abnormality (TH3) 1301...
  • Page 75: Intermittent Fault Check Code (Outdoor Units Only)

    Check Code Check Content 6831 MA communication reception error (no reception) 6832 MA communication reception error (frequency restoration error) 6833 MA communication transmission error (H/W error) 6834 MA communication reception error (start bit detection error) 7100 Total capacity error 7101 Capacity code error 7102 Connected units exceeds the limit...
  • Page 76: Self-Diagnosis And Problem-Solving Using Check Codes

    3 3 Self-Diagnosis and Problem-Solving Using Check Codes [1] Mechanical Check code Meaning, detecting method Cause Checking method & Countermeasure 0403 Serial If serial transmission cannot be 1) Wiring is defective. Check 1, the connections, 2, contact transmission established between the MAIN and at the connectors and 3, for broken abnormality INV boards.
  • Page 77 Check code Meaning, detecting method Cause Checking method & Countermeasure 1111 1. When saturation temperature 1) Gas leak, Gas shortage. See Refrigerant amount check. pressure sensor (TH2) or liquid level de- saturation tecting temperature sensors 2) Insufficient load operations. Check operating conditions and opera- tempera- (TH3, TH4) detects -40˚C or tion status of outdoor unit.
  • Page 78 Check code Meaning, detecting method Cause Checking method & Countermeasure 1301 Low pressure When starting from the stop mode 1) Internal pressure is dropping due Refer to the item on judging low pres- abnoramlity for the first time, (if at the start of bind to a gas leak.
  • Page 79 Check code Meaning, detecting method Cause Checking method 1500 Overcharged 1. When discharge superheart 1) Excessive refrigerant charge. Check refrigerant amount. refrigerant 10 deg and oil temperature abnormality 2) Thermistor trouble (TH1, TH10). Check resistance of thermistor. superheat < 15 deg is keeping for 10 minutes or discharge 3) Pressure sensor trouble (63HS).
  • Page 80 Check code Meaning, detecting method Cause Checking method & Countermeasure 1. Judging that the state when the 1505 Suction • Operation while neglecting to open Once vacuum operation protection is suction pressure reaches pressure ball valve. Especially for the ball commenced, do not attempt to 0MPa during compressor op- abnormality...
  • Page 81 Check code Meaning, detecting method Cause Checking method & Countermeasure 4103 Reverse phase Reverse phase (or open phase) in 1) The phases of the power supply (L1, If there is reverse phase before the abnormality the power system is being de- L2, L3) have been reversed.
  • Page 82 Check code Meaning, detecting method Cause Checking method & Countermeasure 4115 Power supply The frequency cannot be deter- 1) There is an open phase in the power Check before the breaker, after the sync signal mined when the power is switched supply (L1, L2, L3, N).
  • Page 83 Check code Meaning, detecting method Cause Checking method & Countermeasure 4220 If VDC 400 V is detect- 1) The power supply voltage • Check if an instantaneous stop or power failure, etc. voltage ed during inverter opera- is abnormal. has occurred. abnormality tion.
  • Page 84 Check code Meaning, detecting method Cause Checking method & Countermeasure 4240 Over loard If IAC 32 Amps is detected con- 1) Air passage short cycle. Is the unit’s exhaust short cycling? protection tinuously for 10 minutes during op- eration of the inverter after 5 or 2) The heat exchanger is clogged.
  • Page 85 Check code Meaning, detecting method Cause Checking method & Countermeasure 4260 Cooling fan If the heat sink temperature (THHS) 1) Same as “4230.” Same as “4230.” abnormality 100°C for 20 minutes or longer just before the inverter starts. 5101 Outdoor unit <Other than THHS>...
  • Page 86 Check code Meaning, detecting method Cause Checking method & Countermeasure 1 When pressue sensor detects 5201 Pressure 1) Pressutre sensor trouble. See Troubleshooting of pressure sensor 0.098MPa or less during sensor. abnormality operation, outdoor unit once stops with 3 minutes restarting 2) Inner pressure drop due to a leak- mode, and restarts if the detected age.
  • Page 87: Communication / System

    Check code Meaning, detecting method Cause Checking method & Countermeasure 1 If IAC 5301 IAC sensor/ 3 Amps is detected just 6) The circuit board is defective. If none of the items in 1) to 5) is appli- circuit before the inverter starts, or cable, and if the trouble reappears abnormality If IAC...
  • Page 88 Check Meaning, detecting method Cause Checking method & Countermeasure code 6602 Transmission processor hardware Checking method and processing error Transmission line Shut off the power source of outdoor/in- installed while turning door units/BC controller and make it again. power source on? Check power source of indoor unit.
  • Page 89 Check Meaning, detecting method Cause Checking method & Countermeasure code 6606 Communications with transmis- 1) Data is not properly transmitted due Turn off power sources of indoor unit, BC controller sion processor error to casual errouneous operation of and outdoor unit. the generating controller.
  • Page 90 Check Meaning, detecting method code 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second (continued) interval by transmission side controller, the transmission side detects error. Note: The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
  • Page 91 Check Meaning, detecting method code 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second (continued) interval by transmission side controller, the transmission side detects error. Note: The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
  • Page 92 Check Meaning, detecting method code 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second (continued) interval by transmission side controller, the transmission side detects error. Note: The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
  • Page 93 Check Meaning, detecting method Cause Checking method & Countermeasure code 6608 No response error 1) At the collision of mutual transmis- a) Generation at test run. sion data when transmission wiring Turn off the power sources of OC unit, IC unit Though acknowledgement of re- is modified or the polarity is and Fresh Master for more than 5 minutes si-...
  • Page 94: System Error

    [3] System error Check Meaning, detecting method Cause Checking method & Countermeasure code 7100 Total capacity error 1) Total capacity of indoor units in the a) Chec k for the model total (capacity cord total) of same refrigerant system exceeds indoor units connected.
  • Page 95 Check Meaning, detecting method Cause Checking method & Countermeasure code 7101 Capacity code error 1) The Indoor unit model name (model a) Check for the model name of the Indoor unit code) connected is not connectable. connected. Error display at erroneous con- Connectable range..20~250 nection of Indoor unit of which b) Check for the switch (SW2 if indoor controller...
  • Page 96: Troubleshooting Using Information On Problems With Remote Control, Input From External Source

    [4] Troubleshooting using information on problems with Remote Control, Input from External Source (1) MA Remote Control Symptoms Causes Diagnostic Method and Remedy There is no 1) No power is supplied to the indoor unit by the transformer a) Check MA remote controller terminal 1Main switch of the indoor unit is off response when voltage (between A and B)
  • Page 97 Symptoms Causes 'HO' on the display 1) M-NET Transmission is powered by the outdoor unit 1Main switch on the outdoor unit is off cannot be turned off, and the switch 2Connectors on the main board of the outdoor unit are unplugged does not respond.
  • Page 98 Flow chart: When MA remote controller does not respond. MA Remote controller cannot be operated Nothing appears on the display Units grouped by MA remote controller? LED2 on the controller board of another indoor unit is off Is indoor unit powered off? Power OFF on all indoor units?
  • Page 99 (2) Input from External Source Cannot be remote-controlled DIPSW3-8 OFF? Set DIPSW3-8 to ON. DIPSW1-10 Set DIPSW1-10 to OFF. Is the dipswitch 'Normal/Maintenance' set to 'Maintenance'? Set it to Normal. Does the pulse Under 200ms input conform to specified value (over 200ms)? Follow the specification (over 200ms).
  • Page 100: Transmission Wave Pattern And Noise Check

    4 4 Transmission Wave Pattern and Noise Check [1] M-NET Transmission This series of air conditioning units is controlled by sending signals among centralized control, outdoor units, and indoor units. Noise entering transmission line interferes with normal signal transmission and causes mal- functions.
  • Page 101: Ma Remote Controller Transmission

    Check Points Remedies 4Indoor Unit Control Transmission shield line is Use one-point grounding at outdoor unit. When not ground- grounded at the outdoor unit ed, transmission signals may be changed by trapped noise and interfere with the communication. 5Check the shield for transmission line For the shield earth of the transmission line for centralized (for centralized control) control, the effects of noise can be minimized if grounded at...
  • Page 102 (3) Outdoor Unit Power-Supply Circuit Check Check (TB3) voltage of indoor/outdoor unit transmission terminal board on outdoor unit. Check for torn wire or poor connections DC24~30V Disconnect transmission line from TB3 and check voltage of TB3 Check for short-circuited indoor/outdoor DC24~30V transmission line Check voltage between CNVCC3 1-3 on the main board...
  • Page 103: Troubleshooting

    5 5 Troubleshooting [1] Principal Parts Pressure Sensor (1) Judging Failure 1) Check for failure by comparing the sensing pressure according to the high pressure/low pressure pressure sensor and the pressure gauge pressure. Turn on switches 1, 3, 5, 6 (High) and 2, 4, 5, 6 (Low) of the digital display select switch (SW1) as shown below, and the sensor pressure of the high pressure/low pressure sensors is displayed digitally by the light emitting diode LD1.
  • Page 104 ✻Connector connection specifications on the pressure sensor body side. The connector’s pin numbers on the pressure sensor body side differ from the pin numbers on the main circuit board side. Sensor Body Side MAIN Board Side Pin 1 Pin 3 Vout Pin 2 Pin 2...
  • Page 105 Outdoor LEV The valve opening angle changes in proportion to the number of pulses. (Connections between the outdoor unit’s MAIN board and SLEV, LEV1 (PUD-P250YMF-C) DC12V Gray ø 5 Driver Circuits Black ø 4 ø 4 Yellow ø 3 ø 3 ø...
  • Page 106 Indoor LEV, BC LEV1 and 2 The valve opening angle changes in proportion to the number of pulses. (Connections between the indoor unit’s MAIN board and indoor LEV (PUD-P250YMF-C) Indoor Control Board DC12V Wire joining connector Brown Blue Orange Yellow White Indoor Unit Connector CN60...
  • Page 107 Judgment methods and likely failure mode Caution: The specifications of the outdoor unit (outdoor LEV) and indoor unit (indoor LEV) differ. For this reason, there are cases where the treatment contents differ, so follow the treatment specified for the appropriate LEV as indicated in the right column.
  • Page 108 Outdoor LEV (SLEV) Coil Removal Procedure (configuration) As shown in the figure, the outdoor LEV is made in such a way that the coils and the body can be separated. Body Coils Stopper Indentation for Stopper (12 places around the circumference) Lead Wires <Removing the Coils>...
  • Page 109 (2) Temperature Sensor Thermistor for low temperature = 15kΩ ± 3% = 7.465kΩ ± 2% Thermistor R Thermistor R (TH5~9 : outdoor unit) (TH1, 10) (TH21~24 : indoor unit) = 15exp {3460 ( = 7.465exp {4057 ( 273+t 273+120 273+t 273+0 –20 –10 Temperature (˚C)
  • Page 110 Inverter and Compressor a. Replace only the compressor if only the compressor is found to be defective. (Overcurrent will flow through the inverter if the compressor is damaged, however, the power supply is automati- cally cut when overcurrent is detected, protecting the inverter from damage.) b.
  • Page 111 Treatment of Inverter Output Related Troubles Check item Phenomena Treatment 1 IPM/overcurrent error. Perform the following: · Replace INV board. 1Disconnect INV board Check the (4250 detailed No. 1, 11) INV board CNDR2. After removing, turn error on the outdoor unit and check detection the error status.
  • Page 112 Check item Phenomena Treatment 1Screw terminal is loose. 1Check to see if the IPM screw · Check all IPM screw terminals and tighten. Check the in- terminal is loose. verter circuit 2Check the exterior of the IPM. 2IPM is cracked due to swelling. trouble.
  • Page 113 Simple Checking Procedure for Individual Components of Main Inverter Circuit Part name Judgement method Refer to "Determining Diode Stack Troubleshooting" ( 7 ∞ [1] (3) 6) ) Diode Stack Refer to "Determining IPM interference" ( 7 ∞ [1] (3) 5) ) (Intelligent Power Module) Rush current protection resistor Measure the resistance between terminals: 4.5~5.5kΩ...
  • Page 114 5) Intelligent Power Module (IPM) Measure resistances between each terminal of IPM with tester, and use the results for troubleshooting. Focus on whether there is a complete open (∞Ω) state or short-circuit (~0Ω). The measured resistance value is a guideline and may deviate slightly. Measure between several similar measurement points.
  • Page 115 7) Caution at replacement of inverter parts Fully check wiring for incorrect and loose connection. The incorrect or loose connection of the power circuit part wiring like IPM and diode module causes to damage the IPM. Therefore, check the wiring fully. As the insufficient tightening of screws is difficult to find, tighten them together additionally after finishing other works.
  • Page 116: 8 . Led Monitor Display 1 How To Read The Service Monitor Led

    8 8 . LED Monitor Display 1 1 How to Read the Service Monitor LED [1] How to read the LED By setting of DIPSW1-1 ~ 1-8, the unit operating condition can be observed with the service LED on the control circuit board.
  • Page 117: Outdoor Unit Control Led Monitor

    [2] Outdoor Unit Control LED Monitor 1PUD-P250YMF-C Display Item Remarks 12345678 com- stays on LD 8 is a relay output. Relay output Crank- pressor during It stays on while the power display 1 (lights case opera- normal is on. to display) heater tion operation...
  • Page 118 Display Item Remarks 12345678 high discharge over cur- heat sink over refriger- Lights up if there has 10101000 pressure tempera- rent pro- thermo current ant over been an preliminary error 1,2 ture error tection operation break fill error since the unit was turned on.
  • Page 119 Display Item Remarks 12345678 51 11001100 TH6 Data -99.9 ~ 999.9 ↑ 52 00101100 THHS Data ↑ 53 10101100 HPS Data ↑ 54 01101100 TH7 Data ↑ 55 11101100 TH8 Data ↑ 56 00011100 ↑ 57 10011100 THHS Data ↑ 58 01011100 LPS Data α...
  • Page 120 When the unit stops with a problem, No. 93~112 displays data stored in service memory regarding abnormal stoppage, or preliminary errors. (✻Note Display Item Remarks 12345678 86 01101010 87 11101010 88 00011010 89 10011010 90 01011010 91 11011010 92 00111010 Compressor operation 93 10111010 0000 ~ 9999...
  • Page 121 Display Item Remarks 12345678 116 00101110 INV output frequency 0000 ~ 9999 ↑ 117 10101110 ↑ 118 01101110 SLEV ↑ 119 11101110 LEV1 00011110 Bus current -99.9 ~ 999.9 warm- Compres- prelimi- Outdoor unit 10011110 minute sor in nary er- error operation display mode...
  • Page 122 Display Item Remarks 12345678 151 11101001 152 00011001 153 10011001 154 01011001 155 11011001 156 00111001 157 10111001 158 01111001 159 11111001 IC1 gas pipe 160 00000101 -99.9 ~ 999.9 temperature 161 10000101 162 01000101 11000101 00100101 10100101 01100101 11100101 00010101 10010101 01010101...
  • Page 123 Display Item Remarks 12345678 189 10111101 190 01111101 191 11111101 192 00000011 193 10000011 194 01000011 195 11000011 196 00100011 197 10100011 198 01100011 11100011 00010011 10010011 01010011 11010011 00110011 10110011 01110011 207 11110011 208 00001011 IC1 LEV degree of opening 0000 ~ 9999 209 10001011 210 01001011...
  • Page 124 Item Display Remarks 12345678 227 11000111 228 00100111 229 10100111 230 01100111 231 11100111 232 00010111 0000 : stop 233 10010111 0002 : cooling 234 01010111 235 11010111 236 00110111 237 10110111 238 01110111 239 11110111 240 00001111 IC1 filter 0000 ~ 9999 241 10001111 242 01001111...
  • Page 125: 9 . Test Run

    9 9 . Test Run 1 1 Before a Test Run Check for refrigerant leak and loose power supply/transmission connections. Make sure that the resistance between the power supply terminal block and the ground exceeds 1.0MΩ by measuring it with a DC500V megger.
  • Page 126: Not To Be Alarmed When The Following Symptoms Appear

    Note 1. If the test is started without setting the SWA as shown below, both refrigerant circuit will start the opera- tions. To test each refrigerant circuit individually, set SWA as follows: SWA Setting Unit Operation Remarks Slide Switch SWA on the address board of indoor unit Runs test when so directed Factory Setting...
  • Page 127: Standard Operation (Reference Data)

    4 4 Standard Operation (reference data) [1] Cooling Operation Unit Types Indoor : PFD-P250VM-A Indoor : PFD-P500VM-A – Outdoor : PUD-P250YMF-C ✕ 1 Outdoor : PUD-P250YMF-C ✕ 2 Items Indoor 27 / 19 Ambient Air ˚CDB Temperature ˚CWB Outdoor 35 / 24 No.
  • Page 128: 0 .When Refrigerant Leaks

    0 0 .When Refrigerant Leaks 1 1 Repairing Leaks: Preparation, making repairs, and recharging the system with refrigerant. [1] Location of leaks: Extension piping or indoor unit 1 Connect a pressure gauge to the low-pressure servicing check joint CJ2. 2 Test run all indoor units in cooling mode. 1.
  • Page 129: 0 1 1 . Circulating Composition Analysis 1 Check The Composition Of The Refrigerant

    0 0 1 1 . Circulating Composition Analysis 1 1 Check the Composition of the Refrigerant Start Test run all indoor units. Are all units operating stably? (Note 1) Is the refrigerant composition of OC correct? (Note 2) Check TH2, LPS and the CS Finished checking the circuit block and correct any malfunc- composition.
  • Page 130 Note 1 Wait until the units stabilize as described in the refrigerant amount adjustment procedure in “Chapter 6 ”. Note 2 After the units are operating stably, check that the refrigerant composition of OC is within the following ranges, indicating that the composition check is finished. If the accumulator liquid level AL = 0 when cooling: OC = 0.20 ~ 0.26 If the accumulator liquid level AL = 1 when cooling:...

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