Sensor will become low. If | Mitsubishi Electronics PURY-P400

Judgment methods and likely failure mode

Caution:

The specifications of the outdoor unit (outdoor LEV) and indoor unit (indoor LEV) differ. For this reason, there are cases where the treatment contents differ, so follow the treatment specified for the appropriate LEV as indicated in the right column.

Failure Mode		Judgment Method			Treatment	Affected LEV

Microcomputer	1 Disconnect the control board connector and connect				In the case of driver circuit	Indoor
driver circuit	the check LED as shown in the figure below.				failure, replace the control	BC controller
failure	Indoor, BC controller			Outdoor	board.	Outdoor
	Indoor, BC controller			Outdoor

	When the base power supply is turned on, the indoor LEV
	outputs pulse signals for 10 seconds, the outdoor LEV
	outputs pulse signals for 17 seconds, and BC controller
	outputs pulse signals for 10-20 seconds.
	If the LED does not light up, or lights up and remains on,
	the driver circuit is abnormal.

LEV mechanism	1 If the LEV is locked up, the drive motor turns with no				Replace the LEV.	Indoor
is locked.	load and a small clicking sound is generated.					BC controller
	Generation of this sound when the LEV is fully closed					Outdoor
	or fully open is abnormal.

The LEV motor	Measure the resistance between the coils (red - white, red				Replace the LEV coils.	Indoor
coils have a	- orange, brown - yellow, brown - blue) using a tester. They					BC controller
disconnected	are normal if the resistance is within 150Ω ± 10%.
wire or is shorted.
wire or is shorted.	Measure the resistance between the coils (gray - orange,				Replace the LEV coils.	Outdoor
	Measure the resistance between the coils (gray - orange,				Replace the LEV coils.	Outdoor
	gray - red, gray - yellow, gray - black) using a tester. They
	are normal if the resistance is within 46Ω ± 3%.

Fully closed	1 If you are checking the indoor unit’s LEV, operate the				If there is a large amount of	Indoor
failure (valve	indoor unit’s blower and the other indoor units in the				leakage, replace the LEV.	BC controller
leaks)	cooling mode, then check the piping temperatures
	(liquid pipe temperatures) of the indoor units by the
	operation monitor through the heat source unit’s
	control board. When the fan is running, the linear
	expansion valve is fully closed, so if there is leakage,
	Thermistor		the temperature sensed by the
	Thermistor		thermistor (liquid pipe temperature
	liquid pipe		thermistor (liquid pipe temperature
	liquid pipe		sensor) will become low. If the
	(tempera-		sensor) will become low. If the
	(tempera-		temperature is considerably low
	ture sensor)		temperature is considerably low
	ture sensor)		compared to the remote control’s
	Linear		compared to the remote control’s
	Linear		intake temperature display, it can
	Expansion		intake temperature display, it can
	Expansion		be judged that there is a fully
	Valve		be judged that there is a fully
	Valve		closed failure. In the case of
			closed failure. In the case of
	minimal leakage, it is not necessary to replace the
	LEV if there are no other effects.

Faulty wire	1 Check for pins not fully inserted on the connector and				Check the continuity at the	Indoor
connections in	check the colors of the lead wires visually.				places where trouble is found.	BC controller
the connector or	2 Disconnect the control board’s connector and conduct					BC controller
the connector or	2 Disconnect the control board’s connector and conduct					Outdoor
faulty contact.	a continuity check using a tester.					Outdoor
faulty contact.	a continuity check using a tester.

–73–

PURY-P400, P500YMF-C specifications

Mitsubishi Electronics has long been a leader in the HVAC industry, known for its innovative technology and reliable performance. Among its notable offerings are the P500YMF-C and PURY-P400 models, designed to address the diverse needs of commercial and residential applications.

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Mitsubishi Electronics PURY-P400, P500YMF-C Replace the LEV coils Indoor Coils have a

Models: PURY-P400 P500YMF-C

Replace the LEV coils.

Indoor

coils have a

the temperature sensed by the

thermistor (liquid pipe temperature

sensor) will become low. If the

temperature is considerably low

compared to the remote control’s

intake temperature display, it can

be judged that there is a fully

PURY-P400, P500YMF-C specifications