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Mitsubishi Electric CITY MULTI PVFY-P12NAMU-E Technical & Service Manual Download Page 18

[ 

VI 

 Refrigerant System Diagram ]

- 11 -

HWE1405A

GB

VI 

Refrigerant System Diagram

[1] Refrigerant system diagram

(A)

Gas pipe thermistor TH23

(B)

Gas pipe

(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

PVFY-P12, 18NAMU-E

PVFY-P24, 30, 36, 48, 54NAMU-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)

Summary of Contents for CITY MULTI PVFY-P12NAMU-E

Page 1: ......

Page 2: ...the unit It may also be in violation of applicable laws MITSUBISHI ELECTRIC CORPORATION cannot be held responsible for malfunctions or accidents resulting from the use of the wrong type of refrigerant Ask your dealer or a qualified technician to install the unit Improper installation by the user may result in water leak age electric shock or fire Properly install the unit on a surface that can wit...

Page 3: ...burst or explode When installing the unit in a small space take appropriate precautions to prevent leaked refrigerant from reaching the limiting concentration Leaked refrigerant gas will displace oxygen and may cause oxygen starvation Consult your dealer before installing the unit Consult your dealer or a qualified technician when moving or reinstalling the unit Improper installation may result in...

Page 4: ...of the cylinder first the composition of the remaining refrigerant in the cylinder will change and become unsuitable for use Only use R410A The use of other types of refrigerant that contain chloride may cause the refrigerator oil to deteriorate Use a vacuum pump with a check valve If a vacuum pump that is not equipped with a check valve is used the vacuum pump oil may flow into the refrigerant cy...

Page 5: ...iv HWE1405A GB ...

Page 6: ...or Control 12 1 Cool operation 12 2 Fan operation 13 3 Heat operation 14 4 Auto operation Automatic cool heat change over operation 15 5 Heater control 16 6 Humidifier control 21 7 Fan indication 21 VIII Troubleshooting 1 Troubleshooting 22 1 Check methods 22 2 DC fan motor fan motor indoor control board 26 3 Address switch setting 27 4 Voltage test points on the control board 28 5 Dipswitch setti...

Page 7: ...HWE1405A GB ...

Page 8: ...ating capacity BTU h kW PVFY P12NAMU E 12000 13500 3 5 4 0 PVFY P18NAMU E 18000 20000 5 3 5 9 PVFY P24NAMU E 24000 27000 7 0 7 9 PVFY P30NAMU E 30000 34000 8 8 10 0 PVFY P36NAMU E 36000 40000 10 6 11 7 PVFY P48NAMU E 48000 54000 14 1 15 8 PVFY P54NAMU E 54000 60000 15 8 17 6 ...

Page 9: ...2 HWE1405A GB II Components and Functions 1 Components and Functions 1 Indoor Main Unit 1 Vertical 2 Horizontal Right 3 Horizontal Left 4 Down Flow Air inlet Air outlet Air inlet Air outlet Air inlet Air outlet Air inlet Air outlet ...

Page 10: ...stor at the lower right hand section of the remote controller must be free from obstructions to ensure accurate mea surement of room temperature To set the functions that are not available on this controller PAC YT53CRAU use MA remote controller or the centralized controller Backlit LCD TEMP button MODE button ON OFF lamp ON OFF button FAN button VANE button The lamp will light up in green when tu...

Page 11: ...ETBACK Error code blinks icon appears while the unit is operated in the energy save mode All icons are displayed for explanation icon appears when Operation lock setting is effective icon appears when indoor unit functions are set up Refer to the Installation Manual Fan speed icon Vane icon icon appears when the power is on Indoor temperature Operation modes CENTRAL icon 1 CHECK icon 2 Preset temp...

Page 12: ...ial EPS Polyethylene foam Urethane foam Air filter PP honeycomb fabric Protection device Fuse Refrigerant control device LEV Connectable outdoor unit R410A CITY MULTI Diameter of Liquid R410A in mm 1 4 6 35 Brazed 1 4 6 35 Brazed 3 8 9 52 Brazed 3 8 9 52 Brazed refrigerant pipe Gas R410A in mm 1 2 12 7 Brazed 1 2 12 7 Brazed 5 8 15 88 Brazed 5 8 15 88 Brazed O D Diameter of drain pipe in mm 3 4 19...

Page 13: ...b fabric Protection device Fuse Refrigerant control device LEV Connectable outdoor unit R410A CITY MULTI Diameter of Liquid R410A in mm 3 8 9 52 Brazed 3 8 9 52 Brazed 3 8 9 52 Brazed refrigerant pipe Gas R410A in mm 5 8 15 88 Brazed 5 8 15 88 Brazed 5 8 15 88 Brazed O D Diameter of drain pipe in mm 3 4 19 05 FPT Drawing External PA94C316 Wiring PA94C110 Refrigerant cycle Standard Document Install...

Page 14: ...ipe thermistor TH22 Resistance 0 C 15k 10 C 9 6k 20 C 6 3k 25 C 5 4k 30 C 4 3k 40 C 3 0k Gas pipe thermistor TH23 Resistance 0 C 15k 10 C 9 6k 20 C 6 3k 25 C 5 4k 30 C 4 3k 40 C 3 0k Fuse FUSE 250V 6 3A Fan motor 8 pole Output 244W SIC 81FW D8244 1 Linear expansion valve LEV 12VDC Stepping motor drive port diameter ø3 2 0 2000 pulse Power supply terminal block TB2 L1 L2 G 250V 20A Transmission ter...

Page 15: ... 43 1 3 4 8 3 8 92 3 5 8 30 1 3 16 8 3 8 55 2 3 16 A 36 8 1 1 2 Refrigerant piping brazing connection gas Air filter Air outlet Air inlet 2 Ø4 6 Burring Holes for electric heat installation Ø26 Knockout Hole Secondary drain pipe Emergency draining Ø19 05 3 4 3 4 FPT Indoor Outdoor unit connection Unit mm in Top view Bottom view 70 2 13 16 55 2 3 16 Refrigerant piping brazing connection liquid Prim...

Page 16: ... IV Outlines and Dimensions 9 HWE1405A GB 609 6 24 Width of Unit 609 6 24 Length of Unit Clearance Area Vertical Installation Horizontal Installation Unit mm in ...

Page 17: ...tor Remote indication LED Power supply LED Remote controller supply Switch connection No set Switch for static pressure selection Switch for static pressure selection Connector emergency operation Switch for mode selection Switch for capacity code Switch for mode selection Switch for model selection Switch for mode selection Switch 1st digit address set Switch 10ths digit address set NOTE 1 Symbol...

Page 18: ...rmistor TH23 B Gas pipe 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 PVFY P12 18NAMU E PVFY P24 30 36 48 54NAMU 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 ...

Page 19: ...rs start up anti freezing control starts and the thermo OFF Released condition The timer which prevents reactivating is set for 3 minutes and anti freezing control is cancelled when any one of the following conditions is satisfied 1 Liquid pipe temp TH22 turns 50 F or above 2 The condition of the thermo OFF has become complete by thermoregulating etc 3 The operation modes became mode other than CO...

Page 20: ... GB 2 Fan operation 1 Fan 1 Set by remote controller When Auto is set fan speed becomes Low How to operate 1 Press POWER button 2 Press the operation button to display FAN Type Fan speed notch 3 speeds Auto type Low Med High Auto ON OFF MODE ...

Page 21: ...sor off by the thermoregulating 4 Cool air prevention mode Defrosting mode 5 Capacity increasing mode 2 Hot adjust mode The fan controller becomes the hot adjuster mode for the following conditions 1 When starting the HEAT operation 2 When the thermoregulating function changes from OFF to ON 3 When release the HEAT defrosting operation A Hot adjust mode starts B 5 minutes have passed since the con...

Page 22: ... of operation mode 1 HEAT mode for room temperature Desired temperature 2 COOL mode for room temperature Desired temperature 2 Mode change 1 HEAT mode COOL mode Room temperature Desired temperature 3 F or 3 min has passed 2 COOL mode HEAT mode Room temperature Desired temperature 3 F or 3 min has passed 3 COOL mode 1 Same control as cool operation 4 HEAT mode 1 Same control as heat operation The v...

Page 23: ...ntrol SW3 2 SW3 4 Pattern Defrost Error DIP S W OFF In the case of TGMU S W5 2 OFF THMU YHMU TJMU YJMU S W5 10 OFF TKMU YKMU SW4 932 OFF PUMY S W4 4 OFF N A OFF 1 OFF OFF OFF ON 2 OFF ON 1 1 Not applicable to communication error return air thermistor error and motor error ON ON 3 OFF ON 1 DIP S W ON In the case of TGMU S W5 2 ON THMU YHMU TJMU YJMU S W5 10 ON TKMU YKMU SW4 932 ON PUMY S W4 4 ON No...

Page 24: ... temp 0 9 F 0 5 C Heater ON Inlet air temp set temp 2 7 F 1 5 C The fan will stop and the heater will turn off when DEFROST is displayed ON ON 2 nd Inlet air temp set temp 0 9 F 0 5 C Heater ON Inlet air temp set temp 3 6 F 2 C The fan will stop and the heater will turn off when DEFROST is displayed 1 st Heater output from CN24 1 yellow on the indoor unit control board 2 nd Heater output from CN24...

Page 25: ...C Heater ON Inlet air temp set temp 2 7 F 1 5 C The fan will stop and the heater will turn off when DEFROST is displayed ON ON 2 nd Inlet air temp set temp 0 9 F 0 5 C Heater ON Inlet air temp set temp 3 6 F 2 C The fan will stop and the heater will turn off when DEFROST is displayed 1 st Heater output from CN24 1 yellow on the indoor unit control board 2 nd Heater output from CN24 2 blue on the i...

Page 26: ... or a panel heater Select the heater output pattern 1st CN24 1 or 2nd CN24 2 to use and connect the cable to the connector on the indoor unit control board that corresponds to the selection 3 Locally procured wiring A basic connection method is shown below For relay X use the specifications given below Operation coil Rated voltage 12VDC Power consumption 1W or less Use the diode that is recommende...

Page 27: ...gth of the cable connecting to the circuit board of the indoor unit shorter than 10 meters 32ft Longer than 10 meters 32ft could cause improper operation Use a transit relay when extending wiring such as remote wiring Recommended circuit Wiring diagram 1 phase power supply 208V 230V 60Hz Control board FS1 2 Thermal fuse H1 H2 Heater 26H Overheat protection thermostat 88H Electromagnetic contactor ...

Page 28: ...controller The fan continues to run for 30 seconds after the humidifier stops CNF CN25 Humidistat XA SVA Humidifier XA Indoor unit control board On site preparation Maximum cable length is 10m 32ft Humidifier power source Use XA relay having following specifications Rated voltage 12VDC Power consumption 1W or less Humidistat Minimum applicable load 1mA at DC Contact rating voltage 15VDC or more Co...

Page 29: ...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 Drain sensor DS Thermistor R0 15 k 3 Multiplier of B 3480 k 2 0 C 32 F 15k 10 C 50 F 9 6k 20 C 68 F 6 3k 25 C 77 F 5 2...

Page 30: ...lse changes in the following 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...

Page 31: ...om Checking Criteria Remedy Circuit failure 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 contro...

Page 32: ...the LEV is fully closed 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 tac...

Page 33: ...30 36 NAMU E PVFY P48 54 NAMU E pin 1 pin 3 pin 4 pin 3 50kΩ pin 5 pin 3 150kΩ O L O L 47kΩ 143kΩ 1MΩ O L pin 6 pin 3 Replace indoor controller board I B Replace fan motor MF Replace indoor controller board Is the resistance of the fan motor normal Refer to below table Does the voltage between pin 6 and pin 3 of connector CNMF repeat 0V and 5V Replace the fan motor Is the voltage normal Is there n...

Page 34: ...ller is used On site address setting is required for the indoor units to run 2 Address settings vary in different systems Refer to the section on address setting in the outdoor unit installation manual 3 Address is set with a combination of SW12 10 s digit and SW11 1 s digit To set the address to 3 set SW12 to 0 and SW11 to 3 To set the address to 25 set SW 12 to 2 and SW 11 to 5 A Indoor unit con...

Page 35: ...1st heater control CN24 2 For 2nd heater control CN20 Thermistor Inlet temperature CNMF 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 CN7V Connect to the indoor power board CNEC1 Connect to the indoor controller board CNEC2 FAN OUT 1 VFG Voltage on the side of PC51 and C25 Same with the voltage between 7 and 4 of CNMF VCC Voltage between the ...

Page 36: ...an output 6 Humidifier operation During heating mode During heating operation 7 Fan speed Low Very low 8 Fan speed at heating Thermo OFF Preset fan speed Follows the setting of SW1 7 9 Auto restart after power failure Enabled Disabled 10 Power start stop Enabled Disabled Factory setting Switch position Function Switch setting ON OFF 1 Unit type Cooling only Heat pump 2 Heater thermo type Type 2 ec...

Page 37: ...e to the dipswitches SW1 SW2 and SW3 will become effective when the unit comes to a stop remote controller off There is no need to power cycle the unit 4 Power voltage setting 1 SW5 1 Indoor control board Dipswitch settings must be operated with the main power turned OFF Factory setting Factory setting Set SW5 to 240V side when the power supply is 230 volts When the power supply is 208 volts set S...

Page 38: ...SW14 Rotary switch This switch is used when the unit connected to an R2 series of outdoor unit 1 Indoor control board Note Changes to the dipswitches SW11 SW12 SW14 and SW15 must be made while the unit is stopped and the remote controller is OFF All models Factory setting Factory setting Factory setting 75Pa 0 30in WG 1 2 3 SWA Vertical Horizontal Right Horizontal left SWC 125Pa 0 50in WG 1 2 3 SW...

Page 39: ...Procedure 32 HWE1405A GB IX Disassembly Procedure 1 Disassembly Procedure 1 Control box Exercise caution when removing heavy parts 1 Remove the Electric panel 2 screws 2 Remove the Control box cover 1 screw Fig 1 Fig 2 ...

Page 40: ...rcise caution when removing heavy parts 1 Remove the Filter panel 2 thumbscrews 2 Remove the Blower panel 2 screws Fig 3 3 Remove the cover over the Return Air thermistor box and unplug the thermistor 4 Pull out the thermistor holder and thermistor inside the box Fig 4 ...

Page 41: ...ove the Coil panel by removing all of the screws se curing it to the 3 smaller panels for refrigerant and drain lines Fig 5 3 Slide the smaller panels in the directions indicated and remove Fig 6 4 Remove the 1 or 2 brackets that secure the coil unplug the thermistors and LEV from the control board and route the wires out of the control box area and into the coil section Next slide the coil from t...

Page 42: ... IX Disassembly Procedure 35 HWE1405A GB 5 Remove the plate covering the coil assembly to access the thermistors Fig 9 6 Remove lower and side drain pan Fig 10 ...

Page 43: ...ng with filter if installed indicated in section 2 2 Remove the 1 or 2 brackets that secure the coil as sembly Fig 11 Fig 11 3 Remove the door that covers the small enclosure at tached to the fan assembly Fig 12 Unplug the motor and route the wire harness out of the enclosure 4 Remove the 2 screws that secure the fan assembly and slide out Fig 12 ...

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