Mitsubishi Electronics PCFY-P30NKMU-E, PCFY-P15NKMU-E, PCFY-P24NKMU-E Linear expansion valve

Page 21

7-1-1. Thermistor

<Thermistor characteristic graph>

 

 

 

 

 

 

Room temperature thermistor (TH21)

 

Thermistor for

 

Liquid pipe temperature thermistor (TH22)

 

lower temperature

 

 

 

 

Gas pipe temperature thermistor (TH23)

 

 

 

 

Thermistor R0=15kΩ ± 3%

 

 

Fixed number of B=3480 ± 2%

 

 

Rt=15exp { 3480(

 

1

 

 

 

1

) }

273+(t-32)/1.8

273

 

 

 

 

 

30°F

15.8kΩ

 

 

 

 

 

 

 

50°F

9.6kΩ

 

 

 

 

 

 

 

70°F

6.0kΩ

 

 

 

 

 

 

 

80°F

4.8kΩ

 

 

 

 

 

 

 

90°F

3.9kΩ

 

 

 

 

 

 

100°F

3.2kΩ

 

 

 

 

 

 

7-1-2.Linear expansion valve

Resistance (kΩ)

< Thermistor for lower temperature >

50

40

30

20

10

0

-20 0 20 40 60 80 100 120 Temperature (°F)

Operation summary of the linear expansion valve

•Linear expansion valve open/close through stepping motor after receiving the pulse signal from the indoor controller board.

•Valve position can be changed in proportion to the number of pulse signals.

<Connection between the indoor controller board and the linear expansion valve>

Controller board

DC12V

Linear expansion valve

Brown

6

 

 

4

Blue

 

Red

5

Drive circuit

 

 

 

 

 

 

M

6

Brown

Φ4

Blue

4

Φ4

 

 

 

 

 

 

 

 

 

 

Φ3

 

5

2

Yellow

Φ3

Orange

3

 

 

 

 

 

1

 

Φ2

 

2

Φ2

Red

3

 

Yellow

White

Orange

 

Φ1

White

1

Φ1

 

 

 

 

 

 

 

 

 

Connector(CN60)

 

 

21

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Contents Parts Catalog OCB450 ContentsPart Names and Functions Wired remote controller Specifications SpecificationSound Level Electrical Parts SpecificationsPCFY-P15NKMU-E PCFY-P24NKMU-E NC CurvesCmmcfm How to read curvesFront View Pcfy Gas pipe side/flared connection PCFY-P15, 24, 30, 36NKMU-E Wiring DiagramUnit mm inch Service Ref Refrigerant System DiagramPCFY-P15NKMU-E PCFY-P24NKMU-E PCFY-P30NKMU-E PCFY-P36NKMU-E Ø12.7 1/2 Ø15.88 5/8Room temperature Desired temperature How to operateMicroprocessor Control Indoor Unit Control 6-1. Cool OperationFloat switch control Pressed one time. Dry 67 to 87F DRY OperationControl modes Control details Remarks Thermo regulating Drain pump Same control as Cool operation VaneFAN Operation Pressed one time. Heating 63 to 83F Heat OperationDisplay in Heat operation Defrost Fan Control detailsFrom the preceding Control modes Control details Remarks Fan Thermo OFF modeAuto Operation Automatic COOL/HEAT Change Over Operation When Unit is StoppedDown TroubleshootingLinear expansion valve Closing a valve 1 → 2 → 3 → 4 → Trouble shootingBecome OFF ValveSensor signal check Function of DIP Switch How to set address High ceiling On SWA settingSwitch Match the indoor unit’s refrigerant pipe with the BC How to set branch number SW14 Series R2 onlyOperation by switch Effective Switch PoleJumper Pattern aPCFY-P15NKMU-E PCFY-P24NKMU-E PCFY-P30NKMU-E PCFY-P36NKMU-E Test Point DiagramSW1 Operating Procedure Photos & Illustrations Disassembly ProcedurePCFY-P15NKMU-E PCFY-P24NKUM-E PCFY-P30NKMU-E PCFY-P36NKMU-ERemoving the fan motor and right side fan Removing the room temperature thermistor TH21Removing the side panel Removing the fan 3 connectionRemove the screw from the side panel, and remove Side panel by sliding the panel to the frontRemoving the vane motor Removing the under panelRemoving the drain pan TH23 Removing the pipe thermistors/Liquid TH22 and GasRemoving the guide vane Removing the Auto vaneRemoving the heat exchanger and LEV Remove 2 screws from the heat exchangerRemove the heat exchanger with LEV Page New publication, effective Feb

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