Off | Mitsubishi Electronics PDFY-P18NMU-E, PDFY-P30NMU-E instruction

Output		Output
Output
(Phase)	1	2	3	4
	1	2	3	4

ø1	ON	OFF	OFF	ON

ø2	ON	ON	OFF	OFF

ø3	OFF	ON	ON	OFF

ø4	OFF	OFF	ON	ON

➁Linear expansion valve operation

		D	C
(capacity)
position		Close
position
Valve		Open
			2000 pulse
	A		Opening a valve
	E		all the way
	E
	B	Pulse number
	B

Closing a valve	: 1 → 2 → 3 → 4 → 1
Opening a valve	: 4 → 3 → 2 → 1 → 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 locks and vibrates.

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

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

✻Noise can be detected by placing the ear against the screw dri- ver handle while putting the screw driver to the linear expansion valve.

Extra tightning (80~100pulse)

➂ Trouble 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.

troller board at drive circuit

processor.

failure.

1kΩ LED

Pulse signal will be sent out for 10 seconds as soon as the

main switch is turn on. If there is LED with lights on or lights

off, it means the operation circuit is abnormal.

Linear expansion

Motor will idle and make ticking noise when motor is operated

Exchange the linear

valve mechanism is

while the linear expansion valve is locked. This ticking sound

expansion vale.

locked.

is the sign of the abnormality.

Short or breakage of

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

Exchange the linear

the motor coil of the

red-orange, brown-yellow, brown-blue) using a tester. It is

expansion valve.

linear expansion

normal if the resistance is in the range of 150Ω

10%.

valve.

Valve doesn´t close

To check the linear expansion valve, operate the indoor unit in

If large amount of refriger-

completely (thermis-

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

ation is leaked, exchange

tor leaking).

cooling mode, then check the pipe temperature

<liquid pipe

the linear expansion valve.

temperature> of the indoor unit by the out-

door multi controller board operation moni-

tor. During fan operation, linear expansion

Thermistor

valve is closed completely and if there are

(TH21)

some leaking, detecting temperature of the

Linear

thermistor will go lower. If the detected

expansion

temperature is much lower than the temper-

valve

ature indicated in the remote controller, it

means the valve is not closed all the way. It is not necessary

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

and not making any trouble.

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.