Mitsubishi city multi PKFY-08NAMU-A Technical & Service Manual

Split-type, heat pump air conditioners

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

CITY MULTI Indoor Unit

TECHNICAL & SERVICE MANUAL

CITY MULTI Series

[Models]

PKFY-08NAMU-A

PKFY-12NGMU-A

PKFY-20NFMU-A

PKFY-32NFMU-A

CITY MULTI Series

[Models]

PLFY-12NAMU-A

PLFY-20NAMU-A

PLFY-24NAMU-A

PLFY-32NAMU-A

PLFY-40NAMU-A

• Connected outdoor unit is

PURY-80TMU or PURY-100TMU.

Wall Mounted Type

Ceiling Cassettes Type

CONTENTS

1. PKFY-•MU-A Type ····················OC292-1

2. PLFY-•NAMU-A Type ···············OC290-1

No. OC291

Table of Contents

Chapters

Table of Contents

Troubleshooting

Summary of Contents for Mitsubishi city multi PKFY-08NAMU-A

Page 1: Wall Mounted Type
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OC291 CITY MULTI Indoor Unit TECHNICAL & SERVICE MANUAL Wall Mounted Type CITY MULTI Series [Models] PKFY-08NAMU-A PKFY-12NGMU-A PKFY-20NFMU-A PKFY-32NFMU-A Ceiling Cassettes Type CITY MULTI Series [Models] PLFY-12NAMU-A PLFY-20NAMU-A PLFY-24NAMU-A PLFY-32NAMU-A PLFY-40NAMU-A CONTENTS 1. PKFY-•MU-A Type ····················OC292-1 2.
Page 3: Table Of Contents
PKFY-08NAMU-A PKFY-12NGMU-A PKFY-20NFMU-A PKFY-32NFMU-A CONTENTS 1. DIFFERENCES ····························································································OC292- 3 2. FEATURES ··································································································OC292- 4 3. PART NAMES AND FUNCTIONS ·······························································OC292- 7 4. SPECIFICATIONS ·······················································································OC292- 10 5. OUTLINES AND DIMENSIONS···································································OC292- 17 6. WIRING DIAGRAM······················································································OC292- 21 7. REFRIGERANT SYSTEM DIAGRAM ····························································OC292- 24 8. MICROPROCESSOR CONTROL ·······························································OC292- 25 9.
Page 5: Pkfy-08Namu-A
DIFFERENCES PKFY-08NAMU-A PKFY-12NGMU-A Indoor Unit Indoor Unit PKFY-20NFMU-A PKFY-32NFMU-A Indoor Unit Indoor Unit Differences among the models of PKFY series. PKFY- Model Item 08NAMU-A 12NGMU-A 20NFMU-A 32NFMU-A Lineflow fan Lineflow fan Lineflow fan — 4 speeds type 4 speeds type 2 speeds type 2 speeds type Fan speed...
Page 6: Features
FEATURES PKFY-08NAMU-A Indoor Unit Microprocessor Remote controller Model Cooling capacity / Heating capacity PKFY-08NAMU-A 8,000/9,000 Btu/h 2-1. New Compact Design • Compact 11-5/8 inch (29.5cm) high body fits snugly in even limited spaces. • Light weight 19lbs (8.5kg) unit easy to transport and install. 2-2.
Page 7 PKFY-12NGMU-A Indoor Unit Microprocessor Remote controller Model Cooling capacity / Heating capacity PKFY-12NGMU-A 12,000 / 12,500 Btu/h 2-1. New Compact Design Units have now been downsized to require minimal wall space. A 20% reduction in width 38-31/32 inch (990mm) compared to previous models means that installation is possible in very nar- row spaces.
Page 8 PKFY-20NFMU-A PKFY-32NFMU-A Indoor Unit Microprocessor Remote controller Models Cooling capacity / Heating capacity PKFY-20NFMU-A 20,000 / 22,500 Btu/h PKFY-32NFMU-A 32,000 / 35,500 Btu/h 2-1. COMPACT DESIGN The PKFY series models have been downsized and now require such minimal wall space that they can even be installed above windows.
Page 9: Part Names And Functions
PART NAMES AND FUNCTIONS Indoor Unit Air intake grille Air intake [PKFY-08NAMU-A] Auto vane Filter Air outlet [PKFY-12NGMU-A] Filter Air intake grille Air intake Auto vane Guide vane Air outlet [PKFY-20NFMU-A] [PKFY-32NFMU-A] Removes dust and dirt Filter Air intake grilles from the intake air.
Page 10: Remote Controller
Remote controller Once the operation of the unit is set, subsequent operations can only be performed by pressing the ON/OFF button repeatedly. Operation buttons TEMP. ADJUSTMENT button TIME SETTING button AIR SPEED button This sets the room temperature. The This sets the current time, start time This sets the ventilation fan speed.
Page 11 Display In this display example on the bot- CENTRALLY CLOCK display tom left, a condition where all dis- CONTROLLED display play lamps light is shown for expla- The current time , start time and stop time can be displayed in ten second nation purposes although this differs This indicates when the unit is con- intervals by pressing the time switch...
Page 12: Specifications
SPECIFICATIONS 4-1. Specifications PKFY-08NAMU-A Item Unit PKFY-08NAMU-A Single phase, 208/230V, 60Hz Power [,V,Hz Cooling capacity Btu/h 8,000 Heating capacity Btu/h 9,000 Cooling 0.03 Power Supply Heating 0.03 Cooling 0.15 Starting Current Heating 0.15 Exterior <munsell symbol> — Plastic munsell : <2.60Y 8.66/0.69> Height 11-5/8 Width...
Page 13 PKFY-12NGMU-A Item Unit PKFY-12NGMU-A Power [,V,Hz Single phase, 208/230V, 60Hz Cooling capacity Btu/h 12,000 Heating capacity Btu/h 12,500 Cooling 0.07 Input Heating 0.07 Cooling 0.34 Current Heating 0.34 — Exterior <munsell symbol> Plastic , white : <0.70Y 8.59/0.97> Height 13-3/8 Out dimensions Width Depth...
Page 14 PKFY-20NFMU-A PKFY-30NFMU-A Item Unit PKFY-20NFMU-A PKFY-32NFMU-A Power source [,V,Hz Single phase, 208V-220V, 60Hz Cooling capacity Btu/h 20,000 32,000 Heating capacity Btu/h 22,500 35,500 Cooling 0.09 0.12 Input Heating 0.09 0.12 Cooling 0.44 0.58 Current Heating 0.44 0.58 Exterior <munsell symbol> —...
Page 15 4-2. Electrical parts specifications PKFY-08NAMU-A Model Symbol PKFY-08NAMU-A Parts name Room temperature TH21 Resistance 30˚F/15.8k", 50˚F/9.6k", 70˚F/6.0k", 80˚F/4.8k", 90˚F/3.9k", 100˚F/3.2k" thermistor Liquid pipe thermistor TH22 Resistance 30˚F/15.8k", 50˚F/9.6k", 70˚F/6.0k", 80˚F/4.8k", 90˚F/3.9k", 100˚F/3.2k" Gas pipe thermistor TH23 Resistance 30˚F/15.8k", 50˚F/9.6k", 70˚F/6.0k", 80˚F/4.8k", 90˚F/3.9k", 100˚F/3.2k" Fuse FUSE 250V 6A...
Page 16 PKFY-12NGMU-A Model Symbol PKFY-12NGMU-A Parts name Room temperature thermistor TH21 Resistance 30°F/15.8kΩ, 50°F/9.6kΩ, 70°F/6.0kΩ, 80°F/4.8kΩ, 90°F/3.9kΩ, 100°F/3.2kΩ Liquid pipe temperature thermistor TH22 Resistance 30°F/15.8kΩ, 50°F/9.6kΩ, 70°F/6.0kΩ, 80°F/4.8kΩ, 90°F/3.9kΩ, 100°F/3.2kΩ Gas pipe temperature thermistor TH23 Resistance 30°F/15.8kΩ, 50°F/9.6kΩ, 70°F/6.0kΩ, 80°F/4.8kΩ, 90°F/3.9kΩ, 100°F/3.2kΩ Fuse FUSE 250V 6A...
Page 17 PKFY-20NFMU-A PKFY-30NFMU-A Model Symbol PKFY-32NFMU-A PKFY-20NFMU-A Parts name Room temperature thermistor TH21 Resistance 30°F/15.8kΩ, 50°F/9.6kΩ, 70°F/6.0kΩ, 80°F/4.8kΩ, 90°F/3.9kΩ, 100°F/3.2kΩ Liquid pipe temperature thermistor TH22 Resistance 30°F/15.8kΩ, 50°F/9.6kΩ, 70°F/6.0kΩ, 80°F/4.8kΩ, 90°F/3.9kΩ, 100°F/3.2kΩ Gas pipe temperature thermistor TH23 Resistance 30°F/15.8kΩ, 50°F/9.6kΩ, 70°F/6.0kΩ, 80°F/4.8kΩ, 90°F/3.9kΩ, 100°F/3.2kΩ Fuse FUSE 250V 6A...
Page 18 Unit 4-3. Noise criterion curves Wall 3.3ft Ambient temperature 80˚F Test conditions are based on JIS Z8731 3.3ft PKFY-08NAMU-A PKFY-12NGMU-A SPL(dB) SPL(dB) NOTCH LINE NOTCH LINE Med1 Med1 Med2 Med2 NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF...
Page 19 OUTLINES AND DIMENSIONS Unit : inch(mm) PKFY-08NAMU-A OC292-17...
Page 20 PKFY-12NGMU-A Unit : inch(mm) OC292-18...
Page 21 Unit : inch(mm) PKFY-20NFMU-A OC292-19...
Page 22 PKFY-32NFMU-A Unit : inch(mm) OC292-20...
Page 23: Oc292
WIRING DIAGRAM PKFY-08NAMU-A [LEGEND] NAME NAME NAME SYMBOL SYMBOL SYMBOL CIRCUIT BOARD (ADDRESS) INDOOR POWER BOARD LINEAR EXPANSION VALVE SWITCH MODE SELECTION CAPACITOR (FAN MOTOR) FAN MOTOR VOLTAGE SELECTION FAN PHASE CONTROL VANE MOTOR SW11 ADDRESS SETTING 1ST DIGIT FUSE FUSE (6A/250V) POWER SUPPLY TERMINAL SW12...
Page 24 PKFY-12NGMU-A [LEGEND] SYMBOL NAME SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD CAPACITOR (FAN MOTOR) THERMISTOR TH23 PIPE TEMPERATURE DETECTION/GAS CN32 CONNECTOR REMOTE SWITCH LINEAR EXPANSION VALVE (32°F/15kΩ,77°F/5.4kΩ) CN41 HA TERMINAL-A CIRCUIT BOARD (ADDRESS) FAN MOTOR(WITH INNER THERMOSTAT) CN51 CENTRALLY CONTROL VANE MOTOR SWITCH MODE SELECTION...
Page 25 PKFY-20NFMU-A PKFY-32NFMU-A [LEGEND] SYMBOL NAME SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD CAPACITOR (FAN MOTOR) THERMISTOR TH23 PIPE TEMPERATURE DETECTION/GAS CN32 CONNECTOR REMOTE SWITCH LINEAR EXPANSION VALVE (32°F/15kΩ,77°F/5.4kΩ) CN41 HA TERMINAL-A CIRCUIT BOARD (ADDRESS) FAN MOTOR(WITH INNER THERMOSTAT) CN51 CENTRALLY CONTROL VANE MOTOR SWITCH MODE SELECTION...
Page 26 REFRIGERANT SYSTEM DIAGRAM PKFY-08NAMU-A Gas pipe temperature thermistor TH23 Gas pipe Flare Strainer (#50mesh) Liquid pipe temperature thermistor TH22 Liquid pipe Heat exchanger Linear expansion valve Strainer (#100mesh) Refrigerant flow in cooling Room temperature Refrigerant flow in heating thermistor TH21 Service Ref.
Page 27 MICROPROCESSOR CONTROL INDOOR UNIT CONTROL 8-1. COOL operation <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display COOL. 3 Press the SET TEMP. button to set the desired temperature. NOTE: The set temperature changes 2°F when the button is pressed one time Cooling 67 to 87°F.
Page 28 From the preceding page. Control modes Remarks Control details 3. Drain pump 3-1. Drain pump control •Always drain pump ON during the COOL and DRY mode operation. Except for (Regardless of the thermo ON/ OFF) PKFY-08NAMU-A. •When the operation mode has changed from the COOL or DRY to the others (including Stop), OFF the control after the drain pump ON for 3 minutes.
Page 29: Dry Operation
8-2. DRY operation <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display DRY. 3 Press the SET TEMP. button to set the desired temperature. NOTE: The set temperature changes 2°F when the button is pressed one time.
Page 30: Fan Operation
8-3. FAN operation <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display FAN. Control modes Remarks Control details 1. Fan Set by remote controller. Fan speed notches Type 4 speeds type [Low], [Med2], [Med1], [High] 2 speeds type [Low], [High]...
Page 31: Heat Operation
8-4. HEAT operation <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display HEAT. 3 Press the SET TEMP. button to set the desired temperature. NOTE: The set temperature changes 2°F when the button is pressed one time.
Page 32 From the preceding page. Control modes Control details Remarks 2. Fan 2-2. Preheating exclusion mode 1 This control is same for the model When the condition changes the auxiliary heater ON to OFF without auxiliary heater. (thermoregulating or operation stop, etc), the indoor fan operates in [Low] mode for 1 minute.
Page 33 8-5. AUTO operation [Automatic COOL/HEAT change over operation] <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display AUTO. 3 Press the SET TEMP. button to set the desired temperature. NOTE: The set temperature changes 2°F when the button is pressed one time.
Page 34 8-6. TIMER operation 1) Set the current time 1 Press CLOCK-ON-OFF button to display the “current time” A. Remote "current "timer end "timer start CLOCK No display TIMER TIMER controller time" time" time" display A 2 Each time you press button, the time increases in increments of one minute.
Page 35: Troubleshooting
TROUBLESHOOTING 9-1. How to check PKFY-08NAMU-A Part Name Check points Room temperature Disconnect the connector, then measure the resistance using a tester. thermistor(TH21) (Surrounding temperature 50˚F~86˚F) Liquid pipe temperature thermistor(TH22) Normal Abnormal (Refer to page OC292-36 for details.) Gas pipe temperature 4.3k ~9.6k Open or short...
Page 36 PKFY-12NGMU-A Parts name Check points Room temperature Disconnect the connector then measure the resistance using a tester. thermistor (TH21) (Surrounding temperature 50_F~86_F) Liquid pipe thermistor thermistor (TH22) Normal Abnormal (Refer to page OC292-36 for details.) Gas pipe thermistor 4.3k"~9.6k" Open or short thermistor (TH23) Vane motor...
Page 37 PKFY-20NFMU-A PKFY-32NFMU-A Parts name Check points Room temperature Disconnect the connector then measure the resistance using a tester. thermistor (TH21) (Surrounding temperature 50°F~86°F) Liquid pipe temperature thermistor (TH22) Normal Abnormal (Refer to page OC292-36 for details.) 4.3k"~9.6k" Open or short Gas pipe temperature thermistor (TH23)
Page 38: Oc292
<Thermistor characteristic graph> < Thermistor for lower temperature > Room temperature thermistor(TH21) Thermistor for Liquid pipe temperature thermistor(TH22) lower temperature Gas pipe temperature thermistor(TH23) Thermistor R =15k' ± 3% Fixed number of B=3480k' ± 2% Rt=15exp { 3480( 273+(t-32)/1.8 30_F 15.8k' 50_F 9.6k'...
Page 39 <Output pulse signal and the valve operation> Output Output (Phase) Closing a valve : 1 Opening a valve : 4 The output pulse shifts in above order. 1. When linear expansion valve operation stops, all output phase become OFF. 2. At phase interruption or when phase does not shift in order, motor does not rotate smoothly and motor will lock and vibrates.
Page 40 9-2. FUNCTION OF DIP SWITCH PKFY-08NAMU-A Operation by switch Switch Pole Function Remarks Thermistor <intake temperature Built-in remote controller Indoor unit Address board detection> position Filter clogging detection Provided Not provided <At delivery> Filter sign indication 2,500hr 100hr Air intake (Note 2) Not effective Not effective 1 2 3 4 5 6 7 8 9 10...
Page 41 PKFY-12NGMU-A Operation by switch Switch Pole Function Remarks Thermistor <intake temperature Built-in remote controller Indoor unit Address board detection> position Filter clogging detection Provided Not provided <At delivery> Filter cleaning 2,500hr 100hr Fresh air intake Effective Not effective 1 2 3 4 5 6 7 8 9 10 Remote indication switching Thermostat ON signal indication Fan output indication...
Page 42 PKFY-20NFMU-A PKFY-32NFMU-A Operation by switch Switch Pole Function Remarks Thermistor <intake temperature Built-in remote controller Indoor unit Address board detection> position Filter clogging detection Provided Not provided <At delivery> Filter cleaning 2,500hr 100hr Fresh air intake Effective Not effective 1 2 3 4 5 6 7 8 9 10 Note : Remote indication switching Thermostat ON signal indication...
Page 43 PKFY-08NAMU-A PKFY-12NGMU-A PKFY-20NFMU-A PKFY-32NFMU-A Switch Pole Operation by switch Remarks SW11 Address board 1st digit Address can be set while the address SW12 SW11 unit is stopped. setting Address setting should be done when M-NET <At delivery> Remote controller is being used. SW12 SW11 SW12...
Page 44 DISASSEMBLY PROCEDURE PKFY-08NAMU-A Be careful on removing heavy parts. OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS 1. REMOVING THE LOWER SIDE OF THE INDOOR UNIT FROM THE INSTALLATION PLATE Figure 1 Figure 2 When there is removing plate (1) Remove the corner box at right lower side of the indoor unit.
Page 45 OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS 3. REMOVING THE INDOOR MICRO CONTROLLER BOARD Electrical box cover Photo 2 AND INDOOR POWER BOARD (1) Remove the front panel. (Refer to 2) (2) Remove the electrical box cover (screw 4 10). (Refer to the photo 2) INDOOR MICRO CONTROLLER BOARD (1) Disconnect the following connectors on the indoor micro Screw cap...
Page 46 OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS 5. REMOVING THE NOZZLE ASSEMBLY Photo 5 Heat exchanger Electrical box (1) Remove the front panel (Refer to 2). (2) Remove the electrical box cover. (3) Disconnect the connector (CN5V) on the indoor micro con troller board. (4) After unhook the right side of the corner box, press the upper left side and remove the corner box.
Page 47: Operation Procedure
PKFY-12NGMU-A OPERATION PROCEDURE PHOTOS & ILLUSTRATION (Figure 1) Hook 1. REMOVE THE LOWER SIDE OF THE INDOOR UNIT FROM THE INSTALLATION PLATE (1) Remove the left / right corner box of the indoor unit. (2) Hold and pull down the lower and both ends of the indoor unit, and remove the section from the square hole.
Page 48 OPERATION PROCEDURE PHOTOS & ILLUSTRATION (Photo 4) 4. REMOVING THE VANE MOTOR (1) Disconnect the connector CN6V on the indoor controller Nozzle Set screws board. assemble (2) Remove the 2screws of the vane motor, disconnect the lead wire and remove the vane motor from the shaft. Lead wire Vane motor 5.
Page 49 OPERATION PROCEDURE PHOTOS & ILLUSTRATION (Photo10) 9. REMOVING THE LINE FLOW FAN (1) Remove the terminal block cover. (2) Remove the front panel.(see the photo 1) Heat exchanger (3) Remove the electrical parts box.(see the photo 7) (4) Remove the nozzle assembly.(see the photo 6) (5) Remove the fan motor.(see the photo 8) Set screws (6) Remove the pipe fixture with 2screws.(see the photo11)
Page 50 PKFY-32NFMU-A OPERATING PROCEDURE PHOTOS & ILLUSTRATION 1. Removing the lower side of the indoor unit from the instal- Figure 1 lation plate Hanger of indoor unit (1) Remove the 2 screws. Hang the indoor unit hangers to the catches on the instal- Catch of installation plate lation plate.
Page 51 OPERATING PROCEDURE PHOTOS & ILLUSTRATION (7) Remove the indoor controller board case. Photo 3 Then the Power board and the capacitor can be serviced. Capacitor Power board Terminal block Electrical parts box 5. Removing the vane motor Photo 4 (1) Remove the right side panel. Indoor controller board (2) Remove the screw of the electrical parts box cover, and remove the terminal cover.
Page 52 OPERATING PROCEDURE PHOTOS 8. Removing the lineflow fan and the fan motor Photo 7 (1) Remove the left and right side panels. (2) Remove the grilles. (3) Remove the electrical parts box. Screw Lineflow fan (4) Remove the drain pan. (5) Loosen the screw that fixes the lineflow fan to the fan Fan motor motor.
Page 53 PARTS LIST PANEL PARTS PKFY-08NAMU-A Q'ty / set Price Wiring Recom- Remarks No. Parts No. Parts Name Specifications Diagram mended Unit Amount PKFY-08NAMU-A (Drawing No.) Symbol Q'ty R01 22A 635 R01 22A 651 FRONT PANEL R01 22A 500 AIR FILTER R01 22A 691 INTAKE GRILLE R01 22A 096...
Page 54 T7W E18 762 FAN MOTOR PS4N8-KA R01 22A 114 LINE FLOW FAN R01 005 103 SLEEVE BEARING R01 22A 102 BEARING MOUNT — REMOTE CONTROLLER PAR-20MAU This REMOTE CONTROLLER is made by AIR-CONDITIONING & REFRIGERATION SYSTEMS WORKS,. MITSUBISHI ELECTRIC CORPORATION. OC292-52...
Page 55 HEAT EXCHANGER PARTS PKFY-08NAMU-A Q'ty / set Price Wiring Recom- Remarks No. Parts No. Parts Name Specifications PKFY- Diagram mended Unit Amount (Drawing No.) Symbol 08NAMU-A Q'ty T7W E84 480 HEAT EXCHANGER With connection pipe R01 E27 401 LINEAR EXPANSION VALVE OC292-53...
Page 56 STRUCTURAL PARTS PKFY-12NGMU-A Price Wiring Recom- Remarks Parts Name Parts No. Specifications PKFY-12NGMU-A mended Diagram (Drawing No.) Unit Amount Q'ty Symbol R01 07Y 651 FRONT PANEL R01 07Y 092 VANE SLEEVE R01 07Y 691 FRONT GRILLE R01 A16 500 AIR FILTER R01 07Y 002 AUTO VANE R01 07Y 096...
Page 57 R01 07Y 130 MOTOR SUPPORT R01 E27 401 LINEAR EXPANSION VALVE — REMOTE CONTROLLER PAR-20MAU T7W E00 294 ADDRESS BOARD R01 85Y 304 ADDRESS CABLE This REMOTE CONTROLLER is made by AIR-CONDITIONING & REFRIGERATION SYSTEMS WORKS,. MITSUBISHI ELECTRIC CORPORATION. OC292-55...
Page 58 ELECTRICAL PARTS PKFY-20NFMU-A PKFY-32NFMU-A Q'ty / set Price Wiring Recom- Remarks PKFY- Part No. Part Name Specification Diagram mended (Drawing No.) Symbol Q'ty Unit Amount 20NFMU-A 32NFMU-A R01 Z61 102 BEARING MOUNT R01 12G 103 SLEEVE BEARING R01 13G 114 LEFT LINEFLOW FAN R01 16G 114 LEFT LINEFLOW FAN...
Page 59 RIGHT LINE FLOW FAN SLEEVE BEARING R01 005 103 R01 KV5 102 BEARING MOUNT FAN GUARD T7W B02 675 T7W B03 675 FAN GUARD — REMOTE CONTROLLER PAR-20MAU This REMOTE CONTROLLER is made by AIR-CONDITIONING & REFRIGERATION SYSTEMS WORKS,. MITSUBISHI ELECTRIC CORPORATION. OC292-57...
Page 60 STRUCTURAL PARTS PKFY-20NFMU-A PKFY-32NFMU-A Q'ty / set Price Wiring Recom- Remarks PKFY- Part No. Part Name Specification Diagram mended (Drawing No.) Symbol Q'ty Unit Amount 20NFMU-A 32NFMU-A R01 12G 662 LEFT SIDE PANEL R01 E01 812 UNDER PLATE R01 E00 812 UNDER PLATE R01 E00 811 NOSE...
Page 61 PLFY-12NAMU-A PLFY-20NAMU-A PLFY-24NAMU-A PLFY-32NAMU-A PLFY-40NAMU-A CONTENTS 1. FEATURES··································································································OC290- 2 2. PART NAMES AND FUNCTIONS ······························································OC290- 4 3. SPECIFICATIONS ·······················································································OC290- 6 4. 4-WAY AIR FLOW SYSTEM ·······································································OC290- 9 5. OUTLINES AND DIMENSIONS ··································································OC290- 12 6. WIRING DIAGRAM ·····················································································OC290- 13 7. REFRIGERANT SYSTEM DIAGRAM····························································OC290- 14 8.
Page 62: Plfy-12Namu-A
FEATURES Microprocessor Indoor Unit Remote controller Models Cooling capacity / Heating capacity PLFY-12NAMU-A 12,000 / 13,000 Btu/h PLFY-20NAMU-A 20,000 / 22,500 Btu/h PLFY-24NAMU-A 24,000 / 26,500 Btu/h PLFY-32NAMU-A 32,000 / 36,000 Btu/h PLFY-40NAMU-A 40,000 / 39,000 Btu/h 1. SPACE-SAVING CENTRALLY LOCATED CEILING RECESSED INSTALLATION 2.
Page 63 4. DRAIN PUMP FOR EASY PIPE CONNECTION (DRAIN LIFT-UP MECHANISM) This mechanism, with its capacity to raise drain water 33-7/16 inch above the ceiling line, is convenient for removing water and avoiding piping contact with beams, etc. 33-7/16 5. FRESH AIR INTAKE AND BRANCH DUCTING ARE AVAILABLE (on-site work) 6.
Page 64: Part Names And Functions
PART NAMES AND FUNCTIONS Indoor (Main) Unit Filter Remove dust and pollutants from return air Horizontal Air Outlet Sets airflow horizontal automatically during cooling or dehumidifying. Grille Auto Air Swing Vane Disperses airflow up and down and adjusts the angle of airflow direction.
Page 65: Continuous
Display In this display example on the bot- CENTRALLY CLOCK display tom left, a condition where all dis- CONTROLLED display play lamps light is shown for expla- The current time , start time and stop time can be displayed in ten second nation purposes although this differs This indicates when the unit is con- intervals by pressing the time switch...
Page 66: Specifications
SPECIFICATIONS 3-1. Specifications PLFY-12NAMU-A PLFY-20NAMU-A PLFY-24NAMU-A PLFY-32NAMU-A PLFY-40NAMU-A Item · Power Single phase 208/230V 60Hz Cooling capacity 20,000 24,000 32,000 40,000 Btu/h 12,000 Heating capacity 36,000 39,000 22,500 26,500 Btu/h 13,000 Cooling 0.27 0.27 0.14 0.14 0.14 Input Heating 0.27 0.27 0.14 0.14...
Page 67: Hearing For
3-2. NOISE CRITERION CURVES PLFY-20NAMU-A PLFY-12NAMU-A SPL(dB) SPL(dB) NOTCH LINE NOTCH LINE Med1 Med1 Med2 Med2 NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE 1000...
Page 68: Hearing For
PLFY-40NAMU-A SPL(dB) NOTCH LINE Med1 Med2 UNIT CEILING NC-70 NC-60 NC-50 MICROPHONE NC-40 Ambient temperature 80˚F NC-30 Test conditions are based on JIS Z8731 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz OC290-8...
Page 69: Way Air Flow System
3-3. Electrical parts specifications Model Symbol PLFY-12NAMU-A PLFY-20NAMU-A PLFY-24NAMU-A PLFY-32NAMU-A PLFY-40NAMU-A Parts name Room temperature Resistance 30_F/15.8k", 50_F/9.6k", 70_F/6.0k", 80_F/4.8k", 90_F/3.9k", 100_F/3.2k" TH21 thermistor Liquid pipe thermistor TH22 Resistance 30_F/15.8k", 50_F/9.6k", 70_F/6.0k", 80_F/4.8k", 90_F/3.9k", 100_F/3.2k" Gas pipe thermistor TH23 Resistance 30_F/15.8k", 50_F/9.6k", 70_F/6.0k", 80_F/4.8k", 90_F/3.9k", 100_F/3.2k" Fuse FUSE 250V 6A...
Page 70 2) According to the number of air outlets and height of the ceiling to install the unit, be sure to set the up switches (SWA, SWB) on the indoor board to the appropriate setting. • Correspondence of ceiling heights to numbers of air outlets. PLFY-12, 20NAMU-A (Unit : feet) Standard...
Page 71 4-4. Fresh air intake amount & static pressure characteristics l l PLFY-12, 20, 24NAMU-A Multifunction casement + Standard filter Multifunction casement + High efficiency filter Static pressure [in. W.G.] Static pressure [in. W.G.] Air flow [CFM] Air flow [CFM] 2 intakes 2 intakes 1 intake 1 intake...
Page 72: Outlines And Dimensions
OUTLINES AND DIMENSIONS PLFY-12NAMU-A PLFY-32NAMU-A Unit : in(mm) PLFY-20NAMU-A PLFY-40NAMU-A PLFY-24NAMU-A Branch duct hole Ceiling hole 3-15/16(100) (Cut out hole) 3-15/16(100) 25/32~1-25/32(20~45) 33-27/32~35-13/16(860~910) 25/32~1-25/32(20~45) 3-17/32(90) 3-17/32(90) 31-7/8(810) Fresh air intake Suspension bolt pitch 6-1/4(159) Branch 13-25/32(350) [6-7/8([175) duct Branch duct hole hole 14-[1/8([2.8) Terminal block...
Page 73: Wiring Diagram
WIRING DIAGRAM PLFY-12NAMU-A PLFY-32NAMU-A PLFY-20NAMU-A PLFY-40NAMU-A PLFY-24NAMU-A TO NEXT INDOOR UNIT PULL BOX GRN/YLW AC208-230V DC13.1V CNSK(RED) CN2S(WHT) TRANS FUSE(15A) BREAKER (15A) GRILLE POWER D.U.M POWER CN2D POWER SUPPLY (WHT) CNDK (WHT) FUSE ~/N 208-230V 60Hz (RED) (BLU) (RED) LED1 250V RED RED TO OUTDOOR UNIT...
Page 74: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PLFY-12NAMU-A PLFY-32NAMU-A PLFY-20NAMU-A PLFY-40NAMU-A PLFY-24NAMU-A Strainer (#50mesh) Gas pipe thermistor TH23 Gas pipe Liquid pipe thermistor TH22 Flare connection Liquid pipe Heat exchanger Linear expansion valve Strainer1 (#50mesh) Strainer2 (#100mesh) Strainer (#100mesh) Room temparature Refrigerant flow in cooling thermistor TH21 Refrigerant flow in heating Service Ref.
Page 75: Microprocessor Control
MICROPROCESSOR CONTROL INDOOR UNIT CONTROL 8-1. COOL operation <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display COOL. 3 Press the SET TEMP. button to set the desired temperature. NOTE: The set temperature changes 2°F when the button is pressed one time Cooling 67 to 87°F.
Page 76 From the preceding page. Control modes Remarks Control details 3. Drain pump 3-1. Drain pump control •Always drain pump ON during the COOL and DRY mode operation. (Regardless of the thermo ON/ OFF) •When the operation mode has changed from the COOL or DRY to the others (including Stop), OFF the control after the drain pump ON for 3 minutes.
Page 77 8-2. DRY operation <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display DRY. 3 Press the SET TEMP. button to set the desired temperature. NOTE: The set temperature changes 2°F when the button is pressed one time.
Page 78 8-3. FAN operation <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display FAN. Control modes Remarks Control details Set by remote controller. 1. Fan Type Fan speed notch 4 speeds type [Low], [Med2], [Med1], [High] 2-1.
Page 79 8-4. HEAT operation <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display HEAT. 3 Press the SET TEMP. button to set the desired temperature. NOTE: The set temperature changes 2°F when the button is pressed one time.
Page 80 From the preceding page. Control details Control modes Remarks 2-3. Thermo OFF mode 2. Fan When the thermoregulating function changes to OFF, the indoor fan operates in [Extra low]. 2-4. Heat defrosting mode The indoor fan stops. 3. Drain pump No drain pump operation However, when the control changes from COOL or DRY operation, the drain pump operates for 3 minutes.
Page 81: When Unit Is Stopped Control Mode
8-5. AUTO operation [Automatic COOL/HEAT change over operation] <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display AUTO. 3 Press the SET TEMP. button to set the desired temperature. NOTE: The set temperature changes 2°F when the button is pressed one time.
Page 82: Continuous
8-7. TIMER operation 1) Set the current time 1 Press CLOCK-ON-OFF button to display the “current time” A. Remote "current "timer end "timer start CLOCK No display TIMER TIMER controller time" time" time" display A 2 Each time you press button, the time increases in increments of one minute.
Page 83: Troubleshooting
TROUBLE SHOOTING 9-1. How to check the parts PLFY-12, 20, 24, 32, 40NAMU-A Parts name Check points Room temperature Disconnect the connector then measure the resistance using a tester. thermistor (TH21) (Surrounding temperature 50_F~86_F) Liquid pipe thermistor (TH22) Normal Abnormal (Refer to the next page for a detail.) Gas pipe thermistor 4.3k"~9.6k"...
Page 84: Linear Expansion Valve
<Thermistor characteristic graph> < Thermistor for lower temperature > Room temperature thermistor(TH21) Thermistor for Liquid pipe temperature thermistor(TH22) lower temperature Gas pipe temperature thermistor(TH23) Thermistor R =15k' ± 3% Fixed number of B=3480k' ± 2% Rt=15exp { 3480( 273+(t-32)/1.8 30_F 15.8k' 50_F 9.6k'...
Page 85: Noise
<Output pulse signal and the valve operation> Output Output (Phase) Closing a valve : 1 Opening a valve : 4 The output pulse shifts in above order. 1. When linear expansion valve operation stops, all output phase become OFF. 2. At phase interruption or when phase does not shift in order, motor does not rotate smoothly and motor will lock and vibrates.
Page 86: Function Of Dip Switch
9-2. FUNCTION OF DIP SWITCH Operation by switch Switch Pole Function Remarks Thermistor <intake temperature Built-in remote controller Indoor unit Address board detection> position Filter clogging detection Provided Not provided <At delivery> Filter cleaning 2,500hr 100hr Fresh air intake Effective Not effective 1 2 3 4 5 6 7 8 9 10 Remote indication switching...
Page 87 Switch Pole Operation by switch Remarks Address board Ceiling height can be changed depends on SWB setting. (High ceiling2) <At delivery> Ceiling PLFY-12, 20, 24NAMU-A (Unit : feet) (High ceiling1) height selector (Standard) High High Standard ceiling1 ceiling2 4 direction 11.5 3 direction 10.8...
Page 88: Disassembly Procedure
DISASSEMBLY PROCEDURE PLFY-20NAMU-A Be careful on removing heavy parts. OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS 1. Removing the air intake grille Figure 1 (1) Slide the knob of air intake grille to the direction of the arrow 1 to open the air intake grille. Air intake grille (2) Remove the string hook from the panel to prevent the grille from dropping.
Page 89 OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS 4. Remove the fan motor Photo 3 Fan motor (1) Remove the bell mouth.(See photo 1) (2) Remove the electrical box.(See photo 2) (3) Remove the turbo fan nut, washer and radiation cap(P100, P125). (4) Pull out the turbo fan. (5) Disconnect the connector of the fan motor lead wire.
Page 90 OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS 8. Removing the drain pump and drain sensor Photo 7 (1) Remove the panel. (See photo 5) (2) Remove the bell mouth. (See photo 1) (3) Remove the electrical box. (See photo 2) (4) Remove the drain pan. (See photo 6) (5) Remove the 3 screws of the drain pump.
Page 91: Parts List
R01 E00 223 VANE BUSH R01 E00 063 GEAR (VANE) R01 E00 040 GEAR (MOTOR) R01 E01 040 SCREW ASSY T7W E00 673 REMOTE CONTROLLER PAR-20MAU — This REMOTE CONTROLLER is made by AIR-CONDITIONING & REFRIGERATION SYSTEMS WORKS,. MITSUBISHI ELECTRIC CORPORATION. OC290-31...
Page 92 FUNCTIONAL PARTS PLFY-12NAMU-A PLFY-20NAMU-A PLFY-24NAMU-A PLFY-32NAMU-A PLFY-40NAMU-A Price Q'ty/set Wiring Recom- Remarks Diagram mended Part No. Part Name Specification PLFY- · NAMU-A (Drawing No.) Unit Amount Symbol Q'ty 12 20 TURBO FAN R01 E10 114 TURBO FAN R01 E11 114 SPL WASHER R01 08K 097 HEAT EXCHANGER...
Page 93 FUNCTIONAL PARTS PLFY-12NAMU-A PLFY-20NAMU-A PLFY-24NAMU-A PLFY-32NAMU-A PLFY-40NAMU-A Q'ty/set Price Wiring Recom- Remarks Diagram mended Part No. Part Name Specification PLFY- · NAMU-A (Drawing No.) Unit Amount Symbol Q'ty 12 20 24 T7W E09 529 DRAIN PAN T7W E06 529 DRAIN PAN T7W E07 529 DRAIN PAN R01 29H 523...
Page 94: Optional Parts
OPTIONAL PARTS 12-1. Multi function casement Part No. PAC-SG03TM-E 12-2. Air outlet shutter plate (20 sets) Part No. PAC-SG06SP-E 12-3. High efficiency filter (PAC-SG03TM-E is required in using this optional part.) Part No. PAC-SG01KF OC290-34...
Page 97 3400 Lawrenceville Suwanee Road ● Suwanee, Georgia 30024 ● Toll Free: 800-433-4822 Toll Free Fax: 800-889-9904 www.mrslim.com Specifications are subject to change without notice.

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Mitsubishi city multi PKFY-08NAMU-A Technical & Service Manual

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