MITSUBISHI ELECTRIC PEFY-P36NMAU-E3 (01) PDF DOCUMENT

Observe the following safety precautions for your safety when installing and performing electrical work on the MITSUBISHI ELECTRIC PEFY-P36NMAU-E3. Carefully read the labels affixed to the main unit.

WARNING (failure to follow these instructions poses the risk of serious injury or death):

• Do not use refrigerant other than the type indicated in the manuals and on the nameplate. Doing so may cause the unit or pipes to burst, or result in an explosion or fire.

• Ask your dealer or a qualified technician to install the unit. Improper installation may result in water leakage, electric shock, or fire.

• Properly install the unit on a surface that can withstand its weight. An unstable surface may cause the unit to fall and cause injury.

• Only use specified cables. Securely connect each cable so that the terminals do not carry the weight of the cable. Improperly connected cables may produce heat and start a fire.

• Take appropriate safety measures against wind gusts and earthquakes to prevent the unit from toppling over.

• Only use accessories (e.g., air cleaners, humidifiers, electric heaters) recommended by Mitsubishi Electric.

• Do not make any modifications or alterations to the unit. Consult your dealer for repair, as improper repair may result in water leakage, electric shock, or fire.

• Do not touch the heat exchanger fins with bare hands, as they are sharp and pose a risk of cuts.

• In the event of a refrigerant leak, thoroughly ventilate the room. If gaseous refrigerant comes in contact with an open flame, toxic gases will be generated.

• Properly install the unit according to the instructions in the Installation Manual to prevent water leakage, electric shock, or fire.

• Have all electrical work performed by an authorized electrician according to local regulations and the instructions in the manual. Use a dedicated circuit.

• Keep electrical parts away from water, as wet electrical parts pose a risk of electric shock, smoke, or fire.

• Securely attach the control box cover to prevent dust or water infiltration, which can cause electric shock, smoke, or fire.

• Only use the type of refrigerant that is indicated on the unit when installing or relocating the unit. Infiltration of other types of refrigerant or air may adversely affect the refrigerant cycle and cause pipes to burst or explode.

• When installing in a small space, take precautions to prevent leaked refrigerant from reaching the limiting concentration, which can cause oxygen starvation.

• Consult your dealer or a qualified technician when moving or reinstalling the unit.

• After completing service work, check for a refrigerant leak.

• Do not try to defeat the safety features of the unit, such as the pressure switch or temperature switch.

• Consult your dealer for proper disposal methods.

• Do not use a leak detection additive.

When handling the MITSUBISHI ELECTRIC PEFY-P36NMAU-E3 with R410A refrigerant, follow these precautions:

• Only use R410A. The use of other refrigerants containing chloride may cause the refrigerator oil to deteriorate.

• Do not use the existing refrigerant piping. Residual refrigerant and refrigerator oil in existing piping may contain a large amount of chlorine, which can cause the refrigerator oil in the new unit to deteriorate.

• Use refrigerant piping materials made of phosphorus deoxidized copper. Keep the inner and outer surfaces of the pipes clean and free of contaminants like sulfur, oxides, dust, dirt, oil, and moisture.

• Store piping materials indoors and keep both ends of the pipes sealed until just before brazing.

• Use a small amount of ester oil, ether oil, or alkyl benzene to coat flares and flanges. Infiltration of a large amount of mineral oil can cause refrigerator oil to deteriorate.

• Charge the system with refrigerant in the liquid phase. If gaseous refrigerant is drawn out first, the composition of the remaining refrigerant in the cylinder will change and become unsuitable for use.

• Use a vacuum pump with a check valve to prevent vacuum pump oil from flowing into the refrigerant cycle.

• Prepare tools for exclusive use with R410A. Do not use tools that have been used with conventional refrigerants (e.g., gauge manifold, charging hose, gas leak detector, check valve, etc.).

• Do not use a charging cylinder, as it can change the composition of the refrigerant, making it unsuitable for use.

• Exercise special care when handling tools for use with R410A to prevent infiltration of dust, dirt, or water into the refrigerant system.

Model		PEFY-P36NMAU-E3
Power source		1-phase 208/230V 60Hz
Cooling capacity (Nominal)	*1 BTU/h	36,000
	*1 kW	10.6
	Power input kW	0.24
	Current input A	1.50/1.46
Heating capacity (Nominal)	*2 BTU/h	40,000
	*2 kW	11.7
	Power input kW	0.22
	Current input A	1.39/1.35
External finish		Galvanized steel plate
External dimension H x W x D	in.	9-7/8×55-1/8×28-7/8
	mm	250 x 1400 x 732
Net weight lbs (kg)		86(39)
Heat exchanger		Cross fin (Aluminium fin and copper tube)
FAN	Type x Quantity	Sirocco fan x 2
	External static press.	in.WG	<0.14>-0.20-<0.28>-<0.40>-<0.60>
		Pa	<35>-50-<70>-<100>-<150>
	Motor type	DC motor
	Motor output kW	0.244
	Driving mechanism	Direct-driven by motor
Airflow rate (Low-Mid-High)	cfm	812-989-1165
	m³/min	23.0-28.0-33.0
	L/s	383-467-550
Sound pressure level (Low-Mid-High) dB <A>		32-37-41
Insulation material		EPS, Polyethylene foam, Urethane foam
Air filter		PP honeycomb fabric
Protection device		Fuse
Refrigerant control device		LEV
Connectable outdoor unit		R410A CITY MULTI
Diameter of refrigerant pipe (O.D.)	Liquid (R410A) in. (mm)	3/8 (9.52) Brazed
	Gas (R410A) in. (mm)	5/8 (15.88) Brazed
Diameter of drain pipe in. (mm)		O.D. 1-1/4(32)

Note:

*1 Nominal cooling conditions: Indoor 80degF D.B. / 67degF W.B., Outdoor 95degF D.B. Pipe length 25 ft. (7.6 m), Level difference 0 ft. (0 m).

*2 Nominal heating conditions: Indoor 70degF D.B., Outdoor 47degF D.B. / 43degF W.B. Pipe length 25 ft. (7.6 m), Level difference 0 ft. (0 m).

The external static pressure is set to 0.20in. WG(50Pa) at factory shipment.

Component	Symbol	Specification
Room temperature thermistor	TH21	Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ
Liquid pipe thermistor	TH22	Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ
Gas pipe thermistor	TH23	Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ
Fuse	FUSE	250V 6.3A
Fan motor		8-pole, Output 244W SIC-101CW-D8244-1
Linear expansion valve	LEV	12VDC Stepping motor drive port diameter ø3.2 (0~2000 pulse)
Power supply terminal block	TB2	(L1, L2, G) 250V 20A
Transmission terminal block	TB5, TB15	(1, 2) 250V 15A, (M1, M2, S) 250V 20A
Drain float switch	DS	Open/short detection, Initial contact resistance 500 mΩ or less

Button Number	Button Name	Button Number	Button Name
1	[Set Temperature] Button	7	[Vane Control] Button
2	[Timer Menu] Button / [Monitor/Set] Button	8	[Ventilation] Button / [Operation] Button
3	[Mode] Button / [Back] Button	9	[Check/Clear] Button
4	[Timer On/Off] Button / [Set Day] Button	10	[Test Run] Button
5	[Louver] Button / [Operation] Button	11	[Filter] Button / [ ] Button
6	[Fan Speed] Button	12	[ON/OFF] Button
		13	Position of built-in room thermistor
		14	[Set Time] Button

• Keep the remote controller out of direct sunlight to ensure accurate measurement of room temperature.

• The thermistor at the lower right-hand section of the remote controller must be free from obstructions to ensure accurate measurement of room temperature.

To operate the unit in Cool mode:

1. Press the POWER [ON/OFF] button.

2. Press the operation [Mode] button to display COOL.

3. Press the [Set Temperature] button to set the desired temperature. The temperature changes by 2°F each time the button is pressed, within a range of 67°F to 87°F.

Thermoregulating Function:

• The unit turns on (Thermo ON) when the room temperature is greater than or equal to the desired temperature + 2°F.

• The unit turns off (Thermo OFF) when the room temperature is less than or equal to the desired temperature.

Anti-Freezing Control:

• If the liquid pipe temperature (TH22) drops to 33.8°F or less within 16 minutes of the compressor starting, anti-freezing control starts and the unit turns off (thermo OFF).

• The control is cancelled and the unit can restart after 3 minutes if the liquid pipe temperature (TH22) rises to 50°F or above, or if the unit stops for other reasons.

Fan Control:

• You can select from [Low], [Med], [High], and [Auto] fan speeds. When [Auto] is set, the fan speed changes based on the difference between the room temperature and the desired temperature.

Drain Pump Control:

• The drain pump is always ON during COOL mode operation.

• When the operation mode is changed from COOL to another mode (including Stop), the drain pump continues to run for 3 minutes before turning OFF.

• A float switch detects if it is in water (ON for 15 seconds) or in the air (OFF for 15 seconds) to manage drainage and detect abnormalities.

To operate the unit in Dry mode:

1. Press the POWER [ON/OFF] button.

2. Press the operation [Mode] button to display DRY.

3. Press the [Set Temperature] button to set the desired temperature. The temperature changes by 2°F each time the button is pressed, within a range of 67°F to 87°F.

Thermoregulating Function:

• The unit cycles on and off to control humidity. The ON/OFF cycle time depends on the room temperature, as shown in the table below (after 3 minutes of initial operation).

Room temperature	Thermo regulating signal	Room temperature (T1)	Dry thermo ON time (min)	Dry thermo OFF time (min)
Over 64°F	ON	T1 ≥ 83°F	9	3
		83°F > T1 ≥ 79°F	7	3
		79°F > T1 ≥ 75°F	5	3
		75°F > T1	3	3
	OFF	Unconditional	3	10
Less than 64°F	Dry thermo OFF

Fan Control:

• The indoor fan operation depends on the compressor conditions. During the Dry thermo ON cycle, the fan speed is [Low]. During the Dry thermo OFF cycle, the fan stops, unless the room temperature is below 64°F, in which case it runs at [Low].

Drain Pump Control:

• The drain pump is always ON during DRY mode operation.

• When the operation mode is changed from DRY to another mode (including Stop), the drain pump continues to run for 3 minutes before turning OFF.

To operate the unit in Fan only mode:

1. Press the POWER [ON/OFF] button.

2. Press the operation [Mode] button to display FAN.

Fan Speed:

• You can set the fan speed using the remote controller. The available speeds are [Low], [Med], [High], and [Auto]. When [Auto] is selected, the fan speed defaults to [Low].

Drain Pump Control:

The drain pump will turn ON under the following conditions:

• For 3 minutes after switching from COOL or DRY mode to FAN mode.

• For 6 minutes after the float switch detects it is submerged in water.

To operate the unit in Heat mode:

1. Press the POWER [ON/OFF] button.

2. Press the operation [Mode] button to display HEAT.

3. Press the [Set Temperature] button to set the desired temperature. The temperature changes by 2°F each time the button is pressed, within a range of 63°F to 83°F.

Display Indicators in HEAT Operation:

• [DEFROST]: Displayed during the defrost operation.

• [STANDBY]: Displayed during the hot adjust mode.

Thermoregulating Function:

• The unit turns on (Thermo ON) when the room temperature is less than or equal to the desired temperature – 2°F.

• The unit turns off (Thermo OFF) when the room temperature is greater than or equal to the desired temperature.

Fan Control:

• You can select from [Low], [Med], [High], and [Auto] fan speeds. The fan speed may be temporarily adjusted by the unit’s control modes (e.g., hot adjust, defrost).

• Hot Adjust Mode: At the start of HEAT operation, the fan runs at [Extra Low] or [Low] to prevent cold drafts. “STAND BY” is displayed during this mode.

• Thermo OFF Mode: When the room reaches the set temperature and the unit cycles off, the indoor fan operates in [Extra low].

• Heat Defrosting Mode: The indoor fan stops during defrosting.

To use Auto operation mode:

1. Press POWER [ON/OFF] button.

2. Press the operation [Mode] button to display AUTO.

3. Press the [Set Temperature] button to set the desired temperature. The temperature can be set from 67°F to 83°F.

How it works:

1. Initial Operation: The unit starts in either HEAT or COOL mode based on the initial room temperature.

• HEAT mode is selected if room temperature is less than the desired temperature.

• COOL mode is selected if room temperature is greater than or equal to the desired temperature.

2. Mode Change: The unit will automatically switch between HEAT and COOL modes to maintain the desired temperature.

• HEAT to COOL: Switches when the room temperature is greater than the desired temperature + 3°F, or after 3 minutes in that condition.

• COOL to HEAT: Switches when the room temperature is less than or equal to the desired temperature – 3°F, or after 3 minutes in that condition.

3. Control in COOL/HEAT mode: Once a mode is selected, the unit operates with the same controls as the standard Cool or Heat operations.

To check the room temperature (TH21), liquid pipe (TH22), and gas pipe (TH23) thermistors:

1. Turn off the power to the unit.

2. Disconnect the thermistor’s connector from the control board.

3. Measure the resistance between the thermistor’s terminals with a tester.

4. Compare the reading with the expected values. At a typical ambient temperature of 50°F – 86°F (10°C – 30°C), the resistance should be between 4.3 kΩ and 9.6 kΩ.

• If the reading is within this range, the thermistor is normal.

• If the reading is open or short, the thermistor is abnormal and should be replaced.

Thermistor Resistance Values:

• 32°F (0°C): 15 kΩ

• 50°F (10°C): 9.6 kΩ

• 68°F (20°C): 6.3 kΩ

• 77°F (25°C): 5.2 kΩ

• 86°F (30°C): 4.3 kΩ

• 104°F (40°C): 3.0 kΩ

The LEV is a stepping motor that controls refrigerant flow. When the power is turned on, a pulse signal of 2200 pulses is sent to ensure the valve is fully closed. During normal operation, it should be free of vibration noise.

Use the following table to troubleshoot common LEV issues:

Symptom	Checking Criteria	Remedy
Circuit failure on the microcomputer	Disconnect the connectors on the control board and connect LEDs to test the circuit. Pulse signals are output for 10 seconds when the main power is turned on. If there are LEDs that do not light up at all or remain lit after the pulses are turned off, there is a problem with the driving circuit.	Replace the indoor control board if a driving circuit failure is detected.
Locked LEV	The motor will idle and make a small clicking noise if it is run while the LEV is locked. If this clicking noise is heard both when the valve is fully closed and while it is being opened, it indicates a problem. Check for abnormal sound/vibration by placing a screwdriver against the valve.	Replace the LEV.
Disconnected or shorted LEV motor coils	Measure the resistance between the coils with a tester (red-white, red-orange, brown-yellow, brown-blue). The normal range of resistance is 200 Ω±10%.	Replace the LEV.
Valve closure failure (leaky valve)	To check the LEV, operate the indoor unit in FAN mode while other indoor units are in COOL mode. Check the indoor unit’s liquid pipe temperature on the outdoor unit’s monitor. Normally, the LEV is fully closed. If it’s leaky, the pipe thermistor reading will be lower than normal.	Replace the LEV if the amount of leakage is great.
Misconnections of connectors or contact failure	Perform a visual check for disconnected connectors and correct lead wire color.	Disconnect the connectors on the control board and perform a continuity test.

CAUTION: A high voltage is applied to the fan motor connector (CNMF). Do not unplug this connector while the unit is energized.

Follow these steps if the indoor unit fan does not run:

1. Check the fan motor connector (CNMF) to ensure it is fully inserted. If not, fix the connection.

2. If the connection is secure, check the power supply voltage at the indoor control board. Measure the DC voltage between fan connector pin 1 (+) and pin 4 (-). It should be between 294-340VDC depending on the input AC voltage.

3. Also check the control voltages:

• Vcc: 15VDC (between pin 5 (+) and 4 (-))

• Vsp: 1 – 6.5VDC during operation, 0V when stopped (between pin 6 (+) and 4 (-))

4. If the voltages are not within the normal range, replace the indoor control board.

5. If voltages are normal, check the fan motor position thermistor signal. Get the motor to make a full rotation or more, and measure the voltage at the test point VFG (same as between fan connector pin 7 (+) and 4 (-)).

6. The voltage should alternate between 0VDC and 15VDC.

• If it does, the motor signal is faulty. Replace the indoor control board.

• If it does not alternate, the motor itself is faulty. Replace the motor.

Make sure that power to the unit is turned off before setting the address.

1. When using an ME remote controller, the address must be set with the rotary switches (SW11, SW12) on the indoor unit control board. On-site address setting is required for the indoor units to run.

2. Address settings vary in different systems. Refer to the address setting section in the outdoor unit installation manual.

3. The address is set with a combination of SW12 (10’s digit) and SW11 (1’s digit). For example:

• To set the address to “3,” set SW12 to “0” and SW11 to “3.”

• To set the address to “25,” set SW 12 to “2” and SW 11 to “5.”

Dipswitch settings must be made while the unit is stopped. The factory setting for all SW1 switches is OFF.

Switch position	Function	ON Setting	OFF Setting (Factory)
1	Active Thermistor (intake air thermistor)	Built-in thermistor on the remote controller	Indoor unit
2	Filter clogging detection	Available	Unavailable
3	Filter life	2500 hr	100 hr
4	Outdoor air intake	Enabled	Disabled
5	Remote display	Thermo-ON signal	Fan output
6	Humidifier operation	During heating mode	During heating operation
7	Fan speed	Low	Very low
8	Fan speed at heating Thermo-OFF	Preset fan speed	Follows the setting of SW1-7
9	Auto restart after power failure	Enabled	Disabled
10	Power start/stop	Enabled	Disabled

Dipswitch settings must be made while the unit is stopped. The factory setting for all SW3 switches is OFF.

Switch position	Function	ON Setting	OFF Setting (Factory)
1	Unit type	Cooling only	Heat pump
2	–	–	–
3	–	–	–
4	Heater backup	Enabled	Disabled
5	–	–	–
6	–	–	–
7	–	–	–
8	Heating 4-deg up	Disabled	Enabled
9	–	–	–
10	–	–	–

Exercise caution when removing heavy parts.

1. To remove the control box cover, remove the three fixing screws on the cover.

2. After accessing the interior, follow the appropriate procedures for service. When reattaching the cover, tighten the screws to a torque of 2.0±0.2 N·m.

Exercise caution when removing heavy parts.

1. Remove the control box cover as described in its removal procedure.

2. To remove the thermistor, pull out the thermistor holder and the thermistor itself from their positions on the control box.

Exercise caution when removing heavy parts. Note: Drain the water out of the drain pan before removing it.

1. First, remove the filter and the bottom plate. Push down the tab on the filter and pull it out in the direction of the arrow.

2. Remove the fixing screws on the bottom plate to remove it. When reinstalling, tighten these screws to a torque of 1.4±0.2 N·m.

3. To remove the drainpan, pull it out in the indicated direction.

Exercise caution when removing heavy parts.

1. Remove the drain pan according to its removal procedure.

2. Remove the heat exchanger cover by removing the four fixing screws. When reinstalling, tighten these screws to a torque of 1.4±0.2 N·m.

3. Remove the thermistor from the thermistor holder on the copper tube.

Thermistor size:

• Liquid pipe: ø8mm

• Gas pipe: ø6mm

Exercise caution when removing heavy parts.

1. Remove the filter and the bottom plate by pushing down the tab on the filter and removing the fixing screws on the bottom plate. (Tighten screws to 1.4±0.2 N·m upon reassembly).

2. Remove the bottom half of the fan casing by squeezing the tabs on the casing and pulling it in the indicated direction.

3. Remove the motor cable through the rubber bush.

4. Remove the two motor fixing screws to remove the motor and the Sirocco fan together. (Tighten screws to 3.5±0.2 N·m upon reassembly).

5. Remove the four fan case fixing screws to take the top half of the fan casing off. (Tighten screws to 1.4±0.2 N·m upon reassembly).

Exercise caution when removing heavy parts.

1. Remove the drain pan.

2. Remove the heat exchanger cover.

3. Remove the five fixing screws on the pipe support plate cover to remove it. (Tighten screws to a torque of 2.0±0.2 N·m upon reassembly).

4. Remove the fixing screws on the heat exchanger itself to remove it. (Tighten screws to a torque of 1.4±0.2 N·m upon reassembly).