Mitsubishi Electric CITY MULTI PEFY Series Technical And Service Manual Download Page 43

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[

VIII

Disassembly Procedure ]

- 38 -

HWE1804A

5. Heat exchanger

Be careful on removing heavy parts.

1. Removing the heat exchanger.
(1) Remove the heat exchanger cover (A) with procedure

[2]-3-

(2) Remove the bottom plate which is air outlet side. (fixing

screws: twelve) (Fig.1)

(3) Remove the drainpan. (Fig.2)
(4) Remove the two fixing screws. (Fig.3)

Fig.1

Fig.2

Fig.3

Bottom plate

Drainpan

Fixing screws

Summary of Contents for CITY MULTI PEFY Series

Page 1: ......

Page 2: ...s or the use of accessories other than the ones that are recommended by Mitsubishi Electric may result in smoke fire or explosion Consult your dealer for proper disposal method Do not 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...

Page 3: ...is used the composition of the refrigerant in the cylin der will change and become unsuitable for use 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 ...

Page 4: ...oard 20 5 Setting of dip switch at delivery 21 6 Function setting 21 7 Selecting external static pressure 22 8 Enabling the function to prevent cold draft during heating operation 22 9 Setting addresses 23 10 Function the LED of the indoor unit service board 23 VIII Disassembly Procedure 1 Disassembly Procedure PEFY P36 48NMHU E OA 24 1 Control box 24 2 Fan and fan motor 25 3 LEV thermistor Liquid...

Page 5: ...HWE1804A GB ...

Page 6: ...4A GB I Features 1 Features Model Cooling capacity Heating capacity kW PEFY P36NMHU E OA 10 5 6 2 PEFY P48NMHU E OA 14 1 8 2 PEFY P72NMHU E OA 21 1 12 6 PEFY P96NMHU E OA 28 1 16 7 Ceiling Concealed Series PEFY Indoor unit ...

Page 7: ... II Part Names and Functions 2 HWE1804A GB II Part Names and Functions 1 Part Names and Functions 1 Indoor main unit Air inlet Air outlet ...

Page 8: ...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 the locked button will not appear Main display Main menu Function button F1 Main dis...

Page 9: ...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 Appears while the outdoor units are operated in the silent mode Appears when the thermistor on the indoor unit is activated to monitor the outlet air temperature This icon appears when the remote controller is connected to the Fresh Air Intak...

Page 10: ...he set temperature of the remote controller is 77 F 25 C 4 The factory setting of external static pressure is shown without Refer to Fan characteristics curves according to the external static pressure in DATA BOOK for the usable range of air flow rate 5 If the airflow rate is over the usable range dew drop can be caused from the air outlet and the air flow rate is changed automatically because of...

Page 11: ...kΩ 30 C 4 3kΩ 40 C 3 0kΩ Gas pipe thermistor TH23 Resistance 0 C 15kΩ 10 C 9 6kΩ 20 C 6 3kΩ 25 C 5 4kΩ 30 C 4 3kΩ 40 C 3 0kΩ Inlet air temperature thermistor TH24 Resistance 0 C 15kΩ 10 C 9 6kΩ 20 C 6 3kΩ 25 C 5 4kΩ 30 C 4 3kΩ 40 C 3 0kΩ Fuse FUSE 250 VAC 6 3A Fan motor with inner thermostat MF1 2 8 pole output 244W SIC 101CW D8244 4 10 pole output 375W KMUC4E2MW or KMUC4E3MW Linear expansion valv...

Page 12: ...1 29 1 3 16 15 5 8 50 2 187 69 164 5 58 50 16 11 16 340 13 7 16 1050 41 3 8 Duct Duct 180 326 5 12 7 8 432 17 1 16 Drain pipe 1 Air inlet Air outlet 2 brazing connection brazing connection Integral lift pump outlet 2 5 9 7 8 Terminal block Drain pipe Emergency drain Drain pipe Gravity drain 7 3 8 34 2 3 4 6 1 2 7 1 8 1 3 16 1 3 8 MA remocon Terminal block 1 5 8 5 11 16 2 5 16 2 2 4 7 7 8 700 27 9 ...

Page 13: ...6inch of space should be left below the unit as shown in Fig 3 Create access door 3 for the maintenance from the bottom when the motor fan heat exchanger and drain pan is cleaned exchanged Fig 4 Supply air Intake air Control box Access door 1 Ceiling Ceiling beam Min 20mm Min 20mm Control box Access door 3 Access door 1 450 450 17 3 4 17 3 4 50 900 450 100 200 1000 1230 50 1130 44 1 2 150 200 450 ...

Page 14: ...Terminal block 2 4 ø3 1 8 holes 470 18 9 16 100 3 300 20 13 16 100 3 15 16 327 12 7 8 164 6 1 2 44 41 1 5 8 102 1100 43 5 16 Duct 20 13 16 420 16 9 16 249 9 13 16 342 13 1 2 80 Gravity drain Duct 4 1 16 Duct 3 15 16 100 3 15 16 7 16 5 8 Suspension bolt hole 4 14 30 9 16 1 3 16 Slot 3 3 4 Integral lift pump outlet 3 15 16 3 11 13 16 3 3 16 Drain pipe Emergency drain 1 3 4 3 15 16 3 11 13 16 brazing...

Page 15: ...ch of space should be left below the unit as shown in Fig 3 Create access door 3 for the maintenance from the bottom when the motor fan heat exchanger and drain pan is cleaned exchanged Fig 4 Control box Access door 1 Ceiling Ceiling beam Min 20mm Min 20mm 1250 49 1 4 450 1120 50 50 450 200 300 Supply air 1220 1350 50 Access door 1 450 450 17 3 4 17 3 4 150 200 Access door 3 Control box Bottom of ...

Page 16: ...e wiring of the power supply 5 To perform a drainage test for the drain pump turn on the SWE on the control board while the indoor unit is being powered Be sure to turn off the SWE after completing a drainage test or test run 6 Use copper supply wires AC reactor Power factor improvement Diode Bridge Drain Pump Float switch Fan Motor Power source terminal block Transmission terminal block Transmiss...

Page 17: ...uit breaker should be set up on the wiring of the power supply 5 To perform a drainage test for the drain pump turn on the SWE on the control board while the indoor unit is being powered Be sure to turn off the SWE after completing a drainage test or test run 6 Use copper supply wires ACL SYMBOL SYMBOL EXPLANATION NAME AC reactor Power factor improvement Diode Bridge Drain Pump Float switch Fan Mo...

Page 18: ...Y P72NMHU E OA PEFY P96NMHU E OA Gas pipe ø15 88 5 8 ø19 05 3 4 ø22 2 7 8 Liquid pipe ø9 52 3 8 ø9 52 3 8 ø9 52 3 8 Strainer 100mesh Strainer 100mesh Heat exchanger Inlet air temperature thermistor TH24 Outlet air temperature thermistor TH21 Gas pipe thermistor TH23 Liquid pipe thermistor TH22 Linear expansion valve Gas pipe Brazed joints ...

Page 19: ... fan motor fan motor indoor control board 3 Linear expansion valve Disconnect the connector and measure the resistance between terminals with a tester Refer to the next page for details Normal Abnormal 4 3kΩ 9 6kΩ Open or short Refer to the thermistor characteristic graph below Thermistor R0 15 kΩ 3 Multiplier of B 3480 kΩ 2 0 C 15kΩ 10 C 9 6kΩ 20 C 6 3kΩ 25 C 5 2kΩ 30 C 4 3kΩ 40 C 3 0kΩ Normal Ab...

Page 20: ...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 21: ...g 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 control board if...

Page 22: ...t of LEV is unnec essary unless it is causing a problem Misconnections of connectors or con tact failure Perform a visual check for disconnected connectors Perform a visual check of lead wire color Disconnect the connectors on the control board and perform a continuity test A LEV 1 Check if the drain float switch works properly 2 Check if the drain pump works and drains water properly in cooling o...

Page 23: ...rol board Yes No Is the voltage within the normal range Check the power supply Measure the voltage at the indoor control board 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 Power supply voltage 310 340VDC sa...

Page 24: ...rule is different by each 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 contro...

Page 25: ...output 13VDC 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 VFG Voltage on 3 of PC352 and the side of C351 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 Voltage between the C351 pins 0VDC with the fan stopped 1 6 5VDC with the fan in opera tion Sam...

Page 26: ...3 4 5 6 7 8 ON 1 2 3 4 ON 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 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 setting ON OFF 1 Active Thermistor Indoor unit 2 Filter clogging detection Available Unavailable 3 Filter ...

Page 27: ... indoor unit features a function that automatically changes the fan speed to Very Low when the outside temperature reach es at or below the preset temperature to reduce the undesired effect of cold outside air to the supply air This function can be enabled or disabled and the trigger threshold temperature can also be selected by setting the function No 117 to the desired setting Refer to the table...

Page 28: ...he BC controller to which the indoor unit is con nected Leave it to 0 on the non R2 series of units The rotary switches are all set to 0 when 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 10 Function the LED of the indoor unit service ...

Page 29: ...witch 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 Transmission lead wire x 2 Fan motor lead wire LEV lead wire Inlet air temperature thermistor lead wire Outlet air temperature thermisto...

Page 30: ... 1 4 Removing the fan case Fig 2 1 Remove the four fixing screws on the fan case to remove it Fig 2 5 Removing the fan and fan motor Fig 3 1 Remove the two fixing screws and attachment on the fan motor 2 Pull out the fan motor in the direction of the arrow Exercise caution when removing heavy parts Fig 3 6 Precautions for reinstalling the removed motor in its orig inal position 1 As shown in Fig 4...

Page 31: ... pipe and gas pipe thermistor 1 Remove the thermistors from the thermistor holders which are installed on the piping Fig 3 3 Removing the outlet air temperature thermistor 1 Remove control box cover with procedure 1 1 2 Remove the fixing screws five of the heat exchanger cover A and remove the cover A Fig 1 3 Remove the fixing screws four of maintenance cover B and remove the cover B Fig 1 4 Remov...

Page 32: ...the maintenance cover Fig 3 4 Remove the fixing screws holding the drain hose and the drain pump assy shown in Fig 4 Fig 4 5 Remove the fixing screws and cut the band shown in Fig 5 by doing so the drain pump and the float switch can be disassembled Fig 5 Control box cover Fixing screw Fixing screw Fixing screw Float switch wire clear wire Wire saddle Wire saddle Indoor P C board CNP White CN4F Wh...

Page 33: ...heat exchanger 1 Remove the heat exchanger cover A with procedure 1 3 1 2 Remove the bottom plate which is air outlet side fixing screws twelve Fig 1 3 Remove the drainpan Fig 2 4 Remove the cover A B fixing screws two x 2 Fig 3 Fig 1 Fig 2 Fig 3 Bottom plate Drainpan Fixing screws Fixing screws Cover A Cover B ...

Page 34: ... GB 5 Remove the maintenance cover fixing screws four Fig 4 6 Remove the heat exchanger fixing screws two Fig 5 6 Removed heat exchanger is as shown in Fig 7 Fig 4 Fig 5 Fig 6 Fig 7 Fixing screws Maintenance cover Fixing screws Fixing screws ...

Page 35: ... VIII Disassembly Procedure 30 HWE1804A GB 6 Control box inside layout Power source terminal bed Transmission terminal bed AC reactor Diode bridge ...

Page 36: ... VIII Disassembly Procedure 31 HWE1804A GB 7 Thermistor position Liquid piping thermistor PEFY P36 48NMHU E OA Gas piping thermistor ...

Page 37: ...ng 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 Transmission lead wire x 2 Fan motor lead wire LEV lead wire Inlet air temperature thermistor lead wire Outlet air temperature thermistor Liquid piping temperature thermistor lead wire Gas piping temperature thermistor lead wire Drain pump l...

Page 38: ...or CNMF1 from the control board and remove the ferrite core from the cable Fig 2 A ferrite core is attached to the wire only when the model of fan motor is KMUC4E3MW The model of the motor is noted in the nameplate on the fan motor casing 2 Remove the cable through the rubber bush 3 Removing the bottom plate 1 Remove the thirteen fixing screws on the bottom plate to remove it Fig 1 Fig 2 4 Removin...

Page 39: ...d attachment on the fan motor Fig 5 3 Pull out the fan motor in the direction of the arrow Fig 5 Fig 4 Exercise caution when removing heavy parts Fig 5 6 Precautions for reinstalling the removed motor in its orig inal position 1 As shown in Fig 6 reinstall the motor cable in its original position and reset it on the control board 2 Fix the motor in place so that the heat radiating fins on the moto...

Page 40: ...gas pipe thermistor 1 Remove the thermistors from the thermistor holders which are installed on the piping Fig 3 3 Removing the outlet air temperature thermistor 1 Remove control box cover with procedure 2 1 2 Remove the fixing screws three of the heat exchanger cover A and remove the cover A Fig 1 3 Remove the fixing screws four of maintenance cover B and remove the cover B Fig 1 4 Remove the cab...

Page 41: ...n in Fig 2 Fig 2 3 Remove the fixing screws shown in Fig 3 and remove the wire cover Fig 3 4 Remove the fixing screws shown in Fig 4 and remove the maintenance cover Fig 4 Fixing screw Control box cover Fixing screw Wire saddle Float switch wire clear tube Indoor P C board Drain pump wire Black tube CNP White CN4F White SW1 Wire saddle Clamp Hole Wire cover Fixing screws Fixing screw Maintenance c...

Page 42: ...4A GB 5 Remove the fixing screws holding the drain hose and the drain pump assy shown in Fig 5 Fig 5 6 Remove the fixing screws and cut the band shown in Fig 6 by doing so the drain pump and the float switch can be disassembled Fig 6 Band ...

Page 43: ... parts 1 Removing the heat exchanger 1 Remove the heat exchanger cover A with procedure 2 3 1 2 Remove the bottom plate which is air outlet side fixing screws twelve Fig 1 3 Remove the drainpan Fig 2 4 Remove the two fixing screws Fig 3 Fig 1 Fig 2 Fig 3 Bottom plate Drainpan Fixing screws ...

Page 44: ...cedure 39 HWE1804A GB 5 Remove the maintenance cover fixing screws four Fig 4 6 Remove the heat exchanger fixing screws two Fig 5 Removed heat exchanger is as shown in Fig 6 Fig 4 Fig 5 Fig 6 Maintenance cover Fixing screws ...

Page 45: ...nside layout A ferrite core is attached to the wire only when the model of fan motor is KMUC4E3MW The model of the motor is noted in the nameplate on the fan motor casing Power source terminal bed Transmission terminal bed AC reactor Diode bridge Ferrite core ...

Page 46: ... VIII Disassembly Procedure 41 HWE1804A GB 7 Thermistor position Liquid piping thermistor Liquid piping thermistor Gas piping thermistor Gas piping thermistor PEFY P96NMHU E OA PEFY P72NMHU E OA ...

Page 47: ... 42 VIII Disassembly Procedure GB HWE1804A ...

Page 48: ......

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