Mitsubishi Electronics PMFY-P12NBMU-E1 Output Phase, Linear expansion valve operation

Page 22

<Output pulse signal and the valve operation>

Output

 

Output

 

 

 

 

 

(Phase)

1

2

3

4

 

 

 

 

 

 

{1

ON

OFF

OFF

ON

 

 

 

 

 

{2

ON

ON

OFF

OFF

 

 

 

 

 

{3

OFF

ON

ON

OFF

 

 

 

 

 

{4

OFF

OFF

ON

ON

 

 

 

 

 

2Linear expansion valve operation

Closing a valve : 1 → 2 → 3 → 4 → 1

Opening a valve : 4 → 3 → 2 → 1 → 4

The output pulse shifts in above order.

•When linear expansion valve operation stops, all output phase become OFF.

•At phase interruption or when phase does not shift in order, motor does not rotate smoothly and motor will lock and vibrate.

 

 

D

C

(capacity)

 

 

 

position

 

Close

 

 

 

 

Valve

 

Open

 

 

 

 

2000 pulse

 

A

 

Opening a valve

 

E

 

all the way

 

 

 

 

B

Pulse number

 

 

 

•When the switch is turned on, 2200 pulse closing valve signal will be send till it goes to point A in order to define the valve position.

•When the valve moves smoothly, there is no sound or vibration occurring from the linear expansion valves : however, when the pulse number moves from E to A or when the valve is locked, more sound can be heard than in a normal situation.

•Sound can be detected by placing the ear against the screw driver handle while putting the screw driver tip to the linear expansion valve.

Extra tightening (80~100pulse)

3Trouble shooting

Symptom

 

 

 

 

 

Check points

 

Countermeasures

Operation circuit fail-

Disconnect the connector on the controller board, then con-

Exchange the indoor con-

ure of the micro

nect LED for checking.

6

troller board at drive circuit

processor

 

 

 

 

 

 

5

failure.

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

1k" LED

1

 

 

 

 

 

 

 

 

 

 

When power is turned on, pulse signals will send for 10

 

 

seconds. If the LED does not light or keeps lighting even

 

 

after the signals stop, that means some failures in the

 

 

operation circuit.

 

 

 

 

 

 

 

 

 

 

Linear expansion

Motor will idle and make a ticking noise when the motor is

Exchange the linear

valve mechanism is

operated while the linear expansion valve is locked. This

expansion valve.

locked.

ticking sound is the sign of the abnormality.

 

 

 

 

 

 

 

 

 

Short or breakage of

Measure the resistance between each coil (white-red, yellow-

Exchange the linear

the motor coil of the

brown, orange-red, blue-brown) with a tester. It is normal if

expansion valve.

linear expansion

the resistance is in the range of 150Ω ±10%.

 

 

valve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Valve doesn't close

To check the linear expansion valve, operate the indoor unit

If large amount of refriger-

completely.

in fan mode and at the same time operate other indoor units

ant is leaked, exchange

 

in cooling mode, then check the pipe temperature <liquid

the linear expansion valve.

 

 

 

 

 

 

pipe temperature> of the indoor unit by the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

outdoor multi controller board operation

 

 

 

 

 

 

 

monitor. During fan operation, linear

 

 

 

 

 

 

Thermistor

expansion valve is closed completely and if

 

 

 

 

 

 

(Liquid pipe)

there is any leaking, detecting temperature

 

 

 

 

 

 

 

 

 

 

 

Linear

of the thermistor will go lower. If the detect-

 

 

 

 

 

 

 

 

 

 

expansion

ed temperature is much lower than the tem-

 

 

 

 

 

valve

perature indicated in the remote controller,

 

 

 

 

 

 

 

 

 

it means the valve is not closed all the way. It is not neces-

 

 

sary to exchange the linear expansion valve, if the leakage is

 

 

small and not affecting normal operation.

 

 

 

 

 

 

 

 

 

Wrong connection of

Check the color of lead wire and missing terminal of the con-

Disconnect the connector

the connector or

nector.

 

 

at the controller board,

contact failure

 

 

 

 

 

 

 

then check the continuity.

 

 

 

 

 

 

 

 

 

22

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Contents Contents Revised EDITION-BFeatures Technical ChangesRemove dust and pollutants from return air Part Names and FunctionsReturns air from room Display Section ˚F˚CSpecification SpecificationsElectrical Parts Specifications WNote Refer to Wiring Diagram for the supplied voltageAIR Capacity Taken from Outside How to read curvesOperation in conjunction with duct fan Booster fan PMFY-P08NBMU-E Noise Criterion Curves PMFY-P06NBMU-EPMFY-P15NBMU-E PMFY-P12NBMU-EIndoor Installation space required aroundRight side TopWiring Diagram PMFY-P06NBMU-E PMFY-P08NBMU-EPmfy PMFY-P06NBMU-E1PMFY-P08NBMU-E1E1PMFY-P15NBMU-E1 Refrigerant System Diagram Unitin.mmIndoor Unit Control 8-1. Cool Operation How to operateMicroprocessor Control Pressed once. Cooling 67 to 87FDrain sensor function Control modes Drain pump VaneBasic control system Pressed once. Dry 67 to 87F Desired temperatureDRY Operation Drain pump Same control as Cool operation VaneOn the vanes downward blow setting FAN OperationPressed once. Heating 63 to 83F Heat OperationDisplay in Heat operation Defrost From the preceding When Unit is Stopped Auto Operation Automatic COOL/HEAT Change Over OperationTrouble Shooting Linear expansion valve Operation summary of the linear expansion valveTrouble shooting Output PhaseLinear expansion valve operation Replace the fan motor TroubleshootingAny broken wire by using a tester Replace the fuse Indoor controller board fuse check YesFunction of DIP Switch Operation by switch Effective Switch Pole SW11SW14 Switch SW12SW4 Disassembly Procedure Operating Procedure PHOTOS&ILLUSTRATIONSRemoving the nozzle Removing the electrical parts boxRemoving the vane motor Removing the drain pump Removing the thermistorRoom temperature detectionRemoving the fan motor and line flow fan Drawing No Part Name SpecificationQty/set Remarks E11 003Part number that is circled is not shown in the figure Electrical Parts PMFY-P06NBMU-E PMFY-P08NBMU-E R01 E01 E07 E14 E15 RoHSE16 E04R01 E32 114 R01 23A 102R01 E04 103 R01 E01 079R01 E27 246 Qty/setE41 716 R01 E21 246Made in Japan

PMFY-P08NBMU-E, PMFY-P12NBMU-E1, PMFY-P08NBMU-E1, PMFY-P06NBMU-E, PMFY-P12NBMU-E specifications

Mitsubishi Electronics has long been a pioneer in the field of air conditioning and climate control technologies. Among their impressive lineup of products is the PMFY series, which includes models such as the PMFY-P06NBMU-E1, PMFY-P12NBMU-E, PMFY-P06NBMU-E, PMFY-P08NBMU-E1, and PMFY-P12NBMU-E1. These advanced air conditioning systems are engineered to offer optimal comfort, energy efficiency, and innovative features for both residential and commercial applications.

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The PMFY models also boast a sleek and modern design, ensuring they blend seamlessly with any interior décor. Compact and lightweight, they can be installed in various settings, maximizing available space without compromising on performance.

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In summary, the Mitsubishi Electronics PMFY-P06NBMU-E1, PMFY-P12NBMU-E, PMFY-P06NBMU-E, PMFY-P08NBMU-E1, and PMFY-P12NBMU-E1 are exemplary models that embody the essence of innovation, efficiency, and reliability. They represent the ideal choice for those seeking advanced climate control solutions suitable for a variety of spaces.
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