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Mitsubishi Electric CITY MULTI PFFY-P20VCM-E Technical & Service Manual Download Page 23

[ 

VII 

 Troubleshooting ]

- 18 -

HWE18160

GB

2. DC fan motor (fan motor/indoor control board)

1.  CAUTION 

A high voltage is applied to the connector for connection to the fan motor (CNMF1). 

Do not unplug the connector CNMF1 with the unit energized to avoid damage to the indoor control board and fan motor.

2.  Troubleshooting

Symptom: Indoor unit fan does not run.

Check fan motor connector contact 
(CNMF1).

Replace the indoor control board.

Replace the indoor control board.

Fix the connection.

Yes

No

Yes

No

Yes

No

Check the fan motor position thermistor signal.
Get the motor to make a full rotation or more, and measure the voltage at the test point 
V

FG

.

(same with the voltage between fan connector 7 (+) and 4(-))

Is the fan motor connector 
(CNMF1) fully inserted?

Is the voltage within the 
normal range? 

Replace the motor.

Are 0VDC and 15VDC 
displayed alternately?

Check the power supply.
Measure the voltage at the indoor control board.

310 - 340VDC (same with the voltage between fan connector 1 (+) and 4(-))

15VDC (same with the voltage between fan connector 5 (+) and 4(-)) 
1 - 6.5VDC (same with the voltage between fan connector 6 (+) and 4(-)) 

[Values for Vsp are the values that are measured with the fan motor in operation. 
Vsp is 0V when the fan motor is stopped.]

V

DC

Power supply voltage

HWE18160.book  18 ページ  ２０１９年２月１８日　月曜日　午前９時５９分

Summary of Contents for CITY MULTI PFFY-P20VCM-E

Page 1: ......

Page 2: ...use a leak detection additive Precautions for handling units for use with R410A Do not use the existing refrigerant piping A large amount of chlorine that may be contained in the residual refrigerant and refrigerator oil in the existing piping may cause the refrigerator oil in the new unit to deteriorate Use refrigerant piping materials made of phosphorus deoxidized cop per Keep the inner and oute...

Page 3: ...B Exercise special care when handling tools for use with R410A Infiltration of dust dirt or water into the refrigerant system may cause the refrigerator oil to deteriorate HWE18160 book ii ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 4: ... control board 18 3 Setting of address switch 19 4 Voltage test points on the control board 20 5 Setting of Dip switch at delivery 21 6 Function setting 21 7 Selecting the external static pressure 22 8 Setting addresses 23 9 Setting of intermittent fan control 23 10 Function the LED of the indoor unit service board 23 VIII Disassembly Procedure 1 Disassembly Procedure 24 1 Control box 24 2 Thermis...

Page 5: ...HWE18160 GB HWE18160 book 2 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 6: ...ures 1 Features Model Cooling capacity Heating capacity kW PFFY P20VCM E 2 2 2 5 PFFY P25VCM E 2 8 3 2 PFFY P32VCM E 3 6 4 0 PFFY P40VCM E 4 5 5 0 PFFY P50VCM E 5 6 6 3 PFFY P63VCM E 7 1 8 0 HWE18160 book 1 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 7: ... II Components and Functions 2 HWE18160 GB II Components and Functions 1 Components and Functions 1 Indoor Main Unit A Air A A HWE18160 book 2 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 8: ... up in green while the unit is in operation It blinks while the remote controller is starting up or when there is an error The functions of the function buttons change depending on the screen Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen When the system is centrally controlled the button function guide that corresponds to th...

Page 9: ...n is enabled appears when the timer is disabled by the centralized control system Appears when the Weekly timer is enabled Appears while the units are operated in the energy save mode Will not appear on some models of indoor units Appears while the outdoor units are operated in the silent mode Appears when the built in thermistor on the remote controller is activated to monitor the room temperatur...

Page 10: ...th to the air outlet Model name PFFY P20VCM E PFFY P25VCM E PFFY P32VCM E Power source 220 240V 50Hz 60Hz Cooling capacity 1 kW 2 2 2 8 3 6 Heating capacity 1 2 5 3 2 4 0 Power consumption Cooling kW 0 022 0 026 0 031 Heating 0 022 0 026 0 031 Current Cooling A 0 25 0 30 0 34 Heating 0 25 0 30 0 34 External finish Galvanized steel plate Dimension Height 2 mm 615 690 Width 700 Depth 200 Net weight ...

Page 11: ...FY P50VCM E PFFY P63VCM E Power source 220 240V 50Hz 60Hz Cooling capacity 1 kW 4 5 5 6 7 1 Heating capacity 1 5 0 6 3 8 0 Power consumption Cooling kW 0 038 0 052 0 058 Heating 0 038 0 052 0 058 Current Cooling A 0 38 0 50 0 49 Heating 0 38 0 50 0 49 External finish Galvanized steel plate Dimension Height 2 mm 615 690 Width 900 1100 Depth 200 Net weight kg 22 5 22 5 25 5 Heat exchanger Cross fin ...

Page 12: ...0 1800 pulse Power supply terminal block TB2 L N 330V 30A Transmission terminal block TB5 TB15 1 2 M1 M2 S 250V 20A Component Sym bol PFFY P40VCM E PFFY P50VCM E PFFY P63VCM E Room temperature thermistor TH21 Resistance 0 C 15kΩ 10 C 9 6kΩ 20 C 6 3kΩ 25 C 5 4kΩ 30 C 4 3kΩ 40 C 3 0kΩ Liquid pipe thermistor TH22 Resistance 0 C 15kΩ 10 C 9 6kΩ 20 C 6 3kΩ 25 C 5 4kΩ 30 C 4 3kΩ 40 C 3 0kΩ Gas pipe ther...

Page 13: ...PFFY P40 50VCM E models have 3 fan PFFY P20 25 32VCM E models have 2 fan D E F A C B 2 Liquid pipe ø9 52 ø15 88 900 1100 1 Gas pipe PFFY P40 50VCM E PFFY P63VCM E 956 1156 756 1002 1202 802 800 1000 600 9 11 7 700 PFFY P20 25 32VCM E Model ø6 35 ø12 7 860 1060 660 A B Wall mounting hole pitch C 23 51 100 100 E 1 F D Duct 30 20 2 E ø2 9 holes 50 5 10 528 Wall mounting hole pitch 4 14 30 Slot Drain ...

Page 14: ...nit Unit Maintenance space Maintenance space Top view Front view Secure enough access space to allow for the maintenance inspection and replacement of the motor fan heat exchanger drain pan and control box Maintenance access space HWE18160 book 9 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 15: ...have 3 fan PFFY P20 25 32VCM E models have 2 fan D E G H F A C B ø9 52 ø15 88 900 1100 PFFY P40 50VCM E PFFY P63VCM E 956 1156 756 1002 1202 802 800 1000 600 9 11 7 930 1130 730 900 1100 700 700 PFFY P20 25 3 2VCM E Model ø6 35 ø12 7 860 1060 660 J 950 1150 750 H B Wall mounting hole pitch C 23 51 100 100 E 1 F D Duct 30 20 2 E ø2 9 holes 50 5 10 528 Wall mounting hole pitch 4 14 30 Slot Drain pip...

Page 16: ...it Unit Maintenance space Maintenance space Top view Front view Secure enough access space to allow for the maintenance inspection and replacement of the motor fan heat exchanger drain pan and control box Maintenance access space HWE18160 book 11 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 17: ...ir temp detection Thermistor piping temp detection liquid Thermistor piping temp detection gas TB2 TB5 TB15 TH21 TH22 TH23 CN32 Connector Remote switch CN41 Connector HA terminal A CN51 Connector Centrally control CN52 Connector Remote indication CN90 Connector Wireless CN105 Connector IT terminal SW1 Switch for mode selection SW2 Switch for capacity code SW3 Switch for mode selection SW14 Switch ...

Page 18: ...ipe C Liquid pipe D Brazed connections E Strainer 100 mesh F Linear expansion valve G Liquid pipe thermistor TH22 H Heat exchanger I Room temperature thermistor TH21 Capacity PFFY P20 25 32 40 50VCM E PFFY P63VCM E Gas pipe ø12 7 1 2 ø15 88 5 8 Liquid pipe ø6 35 1 4 ø9 52 3 8 H I F E E C G A D B HWE18160 book 13 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 19: ...sure the resistance between terminals with a tester Refer to the next page for details Normal Abnormal 4 3k 9 6k Open or short Refer to the thermistor characteristic graph below Low temperature thermistor Room temperature thermistor TH21 Liquid pipe thermistor TH22 Gas pipe thermistor TH23 Thermistor R0 15 k 3 Multiplier of B 3480 k 2 0 C 15k 10 C 9 6k 20 C 6 3k 25 C 5 2k 30 C 4 3k 40 C 3 0k A Tem...

Page 20: ...lowing order When the valve closes 1 2 3 4 1 When the valve opens 4 3 2 1 4 When the valve position remains the same all output signals will be OFF If any output signal is missing or if the signal remains ON the motor vibrates and makes clicking noise A Red G Control board C Blue H Connection CN60 D Orange I Drive circuit E Yellow J Linear expansion valve F White Phase number Output pulse 1 2 3 4 ...

Page 21: ...ure on the microcomputer Disconnect the connectors on the control board and connect LEDs to test the cir cuit as shown below Pulse signals are output for 10 seconds when the main power is turned on If there are LEDs that do not light up at all or remain lit after the pulses are turned off there is a problem with the driving circuit Replace the in door control board if driving circuit failure is de...

Page 22: ...d while the unit is in the FAN mode If the valve is leaky liquid pipe thermistor reading will be lower than normal If it is significantly lower than the inlet temperature on the remote controller valve closure failure is suspected If the amount of leakage is insignificant replacement of LEV is unnec essary unless it is causing a problem Misconnections of connectors or con tact failure Perform a vi...

Page 23: ...nal Get the motor to make a full rotation or more and measure the voltage at the test point VFG same with the voltage between fan connector 7 and 4 Is the fan motor connector CNMF1 fully inserted Is the voltage within the normal range Replace the motor Are 0VDC and 15VDC displayed alternately Check the power supply Measure the voltage at the indoor control board 310 340VDC same with the voltage be...

Page 24: ...ach field work Refer to install manual of outdoor unit operate the address setting 3 Setting the address is combination of SW11 1st digit address setting and SW12 2nd digit address setting Address 3 setting is composed SW11 3 and SW12 0 Address 25 setting is composed SW11 5 and SW12 2 SW22 0 1 2 3 4 5 6 7 8 9 A BCDE F 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 Indoor unit control board SW4 SW2 SW1 SW...

Page 25: ...AMA standard HA terminal A CN44 Thermistor liquid gas tempera ture CN20 Thermistor Inlet temperature CNMF1 Fan motor output 1 4 294 340 VDC 5 4 15 VDC 6 4 0 6 5 VDC 7 4 Stop 0 or 15 VDC Run 7 5 VDC 0 15 pulse 1 VFG Voltage on 3 of PC352 and the side of C081 Same with the voltage between 7 and 4 of CNMF VCC Voltage between the C084 pins 15 VDC Same with the voltage between 5 and 4 of CNMF Vsp Volta...

Page 26: ...ON OFF ON 1 2 3 4 5 6 7 8 9 10 ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 7 8 9 10 ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 7 8 ON 1 2 3 4 ON OFF ON 1 2 3 4 5 6 7 8 9 10 ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 7 8 9 10 ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 7 8 ON 1 2 3 4 ON OFF ON 1 2 3 4 5 6 7 8 9 10 The figure at left shows that the switches 1 through 5 are set to ON and 6 through 10 are set to OFF Switch position Function Switch settin...

Page 27: ...essure settings for the unit to that for the duct To set the external static pressure with the switches on the control board To set the external static pressure from the function selection screen on the remote controller Follow the instructions below and the instructions detailed in the remote controller manual for how to set the switches 1 Set the function setting No 32 Switch setting Function se...

Page 28: ...en shipped from the factory These switches can be used to set unit addresses and branch numbers at will The determination of indoor unit addresses varies with the system at site Set them referring to the Data Book 9 Setting of intermittent fan control When the unit is used in a high temperature and humidity environment set the function setting No 119 to 2 Default setting 1 10 Function the LED of t...

Page 29: ... setting Dip switch SW21 Static pressure setting Dip switch SW22 Function setting Rotary switches SW11 12 Address setting Rotary switch SW14 Branch port setting 2 Connection check of the lead wires listed below which are connected to the controller board Power supply lead wire Network remote controller transmission lead wire Fan motor lead wire LEV lead wire Intake air sensor lead wire Liquid pipi...

Page 30: ...ake air Be careful removing heavy parts 1 Remove the control box cover A according with proce dure 1 1 2 Remove the thermistor 1 Pull out the thermistor holder B and thermistor C on the control box in Fig 3 Fig 3 C B HWE18160 book 25 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 31: ... 3 Remove the fixing screws on the control box F to re move it Fig 5 Fig 5 4 Removing the drain pan 1 Drain the water out of the drain pan before removing it 2 Pull out the drain pan in the direction of the arrow Fig 6 Fig 6 Note To avoid dew condensation use insulated screws in the places marked with circles in Fig 7 Fig 7 D E F a a Drain pan D a a Insulation material HWE18160 book 26 ページ ２０１９年２月...

Page 32: ...motor Fig 8 Fig 8 2 Removing the liquid pipe and gas pipe thermistor 1 Remove the front plate E with procedure 1 3 2 Remove the control box F with procedure 1 3 3 Pull out the drain pan with procedure 1 3 4 Remove a fixing screw on the heat exchanger cover G to remove it Fig 9 Fig 9 5 Remove the thermistor H from the thermistor holder J on the copper tube Fig 10 Thermistor size Liquid pipe ø8mm Ga...

Page 33: ... front plate K to remove it Fig 11 Fig 11 2 Removing the fan casing bottom half 1 Squeeze the tabs on the fan casing to remove it in the di rection of arrow Fig 12 Fig 12 3 Removing the motor cable 1 Remove the motor cable threw the rubber bush 4 Removing the fan motor and the Sirocco fan 1 Remove the four fan guard L screws to remove it Fig 13 2 Remove the two motor fixing screws to remove the mo...

Page 34: ...dels only Be careful removing heavy parts 1 Removing the bearing 1 Remove the two fixing screws on the bearing cover M to remove it Fig 15 Fig 15 2 Remove the two bearing retainer screws to remove the bearing Fig 16 Fig 16 M HWE18160 book 29 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 35: ...control box F with procedure 1 3 4 Pull out the drain pan with procedure 1 3 2 Remove the heat exchanger cover 1 Remove the heat exchanger cover G with procedure 1 4 3 Removing the cover 1 Remove the three fixing screws on the cover N to re move it Fig 17 Fig 17 4 Removing the Heat exchanger 1 Remove the fixing screws on the heat exchanger P to remove it Fig 18 19 Removed heat exchanger is as show...

Page 36: ...Disassembly Procedure 31 HWE18160 GB Note In order to attach and fix the heat exchanger insert the hook a on the heat exchanger Fig 21 to b Fig 22 Fig 21 Fig 22 a b HWE18160 book 31 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 37: ... VIII Disassembly Procedure 32 HWE18160 GB 8 Control box inside layout Transmission terminal bed AC reactor P63 model only Power source terminal bed HWE18160 book 32 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 38: ...bly Procedure 33 HWE18160 GB 9 Sensor position Liquid sensor Gas sensor PFFY P20 25VCM E Liquid sensor Gas sensor PFFY P32VCM E Liquid sensor Gas sensor PFFY P40 50 63VCM E HWE18160 book 33 ページ ２０１９年２月１８日 月曜日 午前９時５９分 ...

Page 39: ......

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