MITSUBISHI ELECTRIC PUHY-HP-YNW-A Air Conditioners Instruction Manual

• Amount of refrigerant to be charged for single-module units

・When the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft)

• Amount of refrigerant to be charged for single-module units

• When connecting PEFY-P50/63/71/80VMHS2-E, add 96 oz of refrigerant per indoor unit.

• When connecting LEV kit (PAC-LV11M-J), additional refrigerant charge may be required. Contact your dealer for details.

  Outdoor unit model: P300 Total capacity of connected indoor units: 361

• Refer to the pipe connection examples in section 9-4 for the pipes marked with the letters below.
  A : ø1/2; 131 ft
  B : ø3/8; 32 ft
  C : ø3/8; 49 ft
  D : ø3/8; 32 ft
  a : ø3/8; 32 ft
  b : ø3/8; 16 ft
  c : ø1/4; 32 ft
  d : ø1/4; 32 ft
  e : ø3/8; 32 ft

The total length of each liquid piping is as follows:
ø1/2 total length: 131 (A)
ø3/8 total length: 32 (B) + 49 (C) + 32 (D) + 32 (a) + 16 (b) + 32 (e) = 193
ø1/4 total length: 32 (c) + 32 (d) = 64

Therefore, when the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft),
Amount of additional charge = (131 × 1.19) + (193 × 0.58) + (64 × 0.23) + 0 + 124 = 406.6 oz (Fractions are rounded up.)

9-9-2. Charging additional refrigerant
Charge the calculated amount of refrigerant in the liquid state to the unit through the service port after the completion of piping work. Upon completion of all work, securely tighten all service port caps and shaft caps to prevent refrigerant leakage.

< Notice>

• Do not vent the refrigerant into the atmosphere.
• Refer to the table below for the appropriate tightening torque.

Pipe size [mm (in)]| Shaft cap (N·m)| Shaft (N·m)| Size of hexagonal wrench [mm (in)]| Service port cap (N·m)
---|---|---|---|---
ø9.52 (ø3/8)| 22| –| –| 12
ø12.7 (ø1/2)| 27| –| –
ø15.88 (ø5/8)| 32| –| –
ø22.2 (ø7/8)| 22| –| –| 16
ø28.58 (ø1-1/8)| 22| –| –| 16

・If the refrigerant tank does not have a siphon pipe, charge the liquid refrigerant with the tank upside-down as shown in the figure below.

• After evacuation and refrigerant charging, ensure that the service valves are fully open. Do not operate the unit with the service valves closed.

Electrical work

WARNING
Electrical work must be performed by qualified personnel in accordance with local regulations and the instructions provided in this manual. Only use the specified cables and dedicated circuits.
– Inadequate power source capacity or improper electrical work will result in electric shock, malfunction, or fire.

Proper grounding must be provided by qualified personnel.
– Improper grounding may result in electric shock, fire, explosion, or malfunction due to electrical noise. Do not connect the ground wire to gas or water pipes, lightning rods, or telephone ground wires.

10-1. Before electrical work

• When performing electrical work, refer to the indoor unit or controller installation manuals as well.
• Bear in mind ambient conditions (ambient temperature, direct sunlight, rain water, etc.) when proceeding with the wiring and connections.
• When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components.
• Specific wiring requirements should adhere to the wiring regulations of the region.
• Include some slack in the wiring for the control box on the indoor and outdoor units, because these boxes are sometimes removed at the time of service work.

10-2. Power cables and device capacity
WARNING

Include some slack in the power cables.
– Failure to do so may break or overheat the cables, resulting in smoke or fire.
Install an inverter circuit breaker on the power supply of each unit.
– Failure to do so may result in electric shock or fire.
Only use properly rated breakers (an earth leakage breaker, local switch <a switch + fuse that meets local electrical codes>, or overcurrent breaker).
– Failure to do so may result in electric shock, malfunction, smoke, or fire.
Only use standard power cables of sufficient capacity.
– Failure to do so may result in current leakage, overheating, smoke, or fire.
Tighten all terminal screws to the specified torque.
– Loose screws and contact failure may result in smoke or fire.

CAUTION
If a large electric current flows due to a malfunction or faulty wiring, earth-leakage breakers on the unit side and on the upstream side of the power supply system could both operate.
Depending on the importance of the system, separate the power supply system or take protective coordination of breakers.

・Wiring example

Ⓐ Earth leakage breaker
Ⓑ Local switch (Overcurrent breaker and earth leakage breaker)
Ⓒ Outdoor unit
Ⓓ Pull box
Ⓔ Indoor unit
Ⓕ Earth

• Be sure to use the appropriate type of overcurrent breaker. Note that generated overcurrent may include some amount of direct current.
• Select the type of breaker for an inverter circuit as an earth leakage breaker. (Mitsubishi Electric NV-S series or its equivalent)
• The earth leakage breaker should be used in combination with a local switch.
• Use a local switch with at least 3 mm (1/8 in) contact separation in each pole.
• Do not connect the power cables L1, L2, and L3 to N. Ensure the correct phase sequence.
• If the power cable is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified persons in order to avoid a hazard.
• Use dedicated power cables for the outdoor unit and indoor unit. Ensure OC and OS are wired individually.
• Power cable size, device capacity, and system impedance
  (If local regulations do not specify the minimum power cable size or device capacity, follow the values in the table below.)

| Minimum size [mm2 (AWG)]| Earth leakage breaker| Local switch (A)| Overcurrent breaker (NFB) (A)| Maximum allowable system impedance
---|---|---|---|---|---
Power cable| Power cable after branching point| Earth wire| Capacity| Fuse
Outdoor unit| (E)P200| 4.0 (12)| –| 4.0 (12)| 30 A 100 mA 0.1 sec. or less| 25| 25| 30| 3
(E)P250| 4.0 (12)| –| 4.0 (12)| 30 A 100 mA 0.1 sec. or less| 32| 32| 30| 3
(E)P300| 4.0 (12)| –| 4.0 (12)| 30 A 100 mA 0.1 sec. or less| 32| 32| 30| 3
(E)P350| 6.0 (10)| –| 6.0 (10)| 40 A 100 mA 0.1 sec. or less| 40| 40| 40| 0.27 Ω
(E)P400| 10.0 (8)| –| 10.0 (8)| 60 A 100 mA 0.1 sec. or less| 63| 63| 60| 0.22 Ω
(E)P450| 10.0 (8)| –| 10.0 (8)| 60 A 100 mA 0.1 sec. or less| 63| 63| 60| 0.19 Ω
(E)P500| 10.0 (8)| –| 10.0 (8)| 60 A 100 mA 0.1 sec. or less| 63| 63| 60| 0.16 Ω
Total operating current of the indoor units| F0 ≤ 16 A 1| 1.5 (16)| 1.5 (16)| 1.5 (16)| 20 A current sensitivity2| 16| 16| 20| (IEC 61000-3-3)
F0 ≤ 25 A 1| 2.5 (14)| 2.5 (14)| 2.5 (14)| 30 A current sensitivity2| 25| 25| 30| (IEC 61000-3-3)
F0 ≤ 32 A 1| 4.0 (12)| 4.0 (12)| 4.0 (12)| 40 A current sensitivity*2| 32| 32| 40| (IEC 61000-3-3)

1 Use the larger value of F1 or F2 as the value of F0.
F1 = Total of each indoor unit’s maximum current × 1.2
F2 = {V1 × (Quantity of Type 1)/C} + {V1 × (Quantity of Type 2)/C} + {V1 × (Quantity of Type 3)/C} + {V1 × (Quantity of Type 4)/C}
2 Current sensitivity is calculated using the following formula.
G1 = (V2 × Quantity of Type 1) + (V2 × Quantity of Type 2) + (V2 × Quantity of Type 3) + (V2 × Quantity of Type 4) + (V3 × Power cable length (km))
*3 Meets technical requirements of IEC 61000-3-3.

“C” is multiples of the tripping current at 0.01 s.
Obtain the value of “C” from the tripping characteristic of the breaker that is used on site.
<Example of “F2” calculation>
Conditions: PEFY-VMS × 4 units, PEFY-VMA × 1 unit, “C” = 8 (See the sample chart.)
F2 = 18.6 × 4/8 + 38 × 1/8
= 14.05
→ Use a 16 A type breaker. (Tripping current = 8 × 16 A at 0.01 s)

• The wire size is the minimum value for metal conduit wiring. If the voltage drops, use a wire that is one size thicker in diameter. Make sure the power-supply voltage does not drop more than 10%. Make sure that the voltage imbalance between the phases is 2% or less.

• Power supply cords of parts of appliances for outdoor use shall not be lighter than polychloroprene sheathed flexible cord (design 60245 IEC57). For example, use wiring such as YZW.

• This unit is intended for the connection to a power supply system with a maximum permissible system impedance shown in the above table at the interface point (power service box) of the user’s supply.

• The user must ensure that this unit is connected only to a power supply system which fulfils the requirement above.
  If necessary, the user can ask the public power supply company for the system impedance at the interface point.

• This unit complies with IEC 61000-3-12 provided that the short-circuit power Ssc is greater than or equal to Ssc1 at the interface point between the user’s supply and the public system. It is the responsibility of the installer or user of the equipment to ensure, by consultation with the distribution network operator if necessary, that the equipment is connected only to a supply with a short-circuit power Ssc greater than or equal to Ssc1 . *1 Ssc

10-3. Control cable specifications
・Transmission cable

(both centralized control transmission cables and indoor-outdoor transmission cables) is 500 m (1640 ft)*1.
The maximum allowable length of transmission cables from the power supply unit to each outdoor unit or to the system controller is 200 m (656 ft).

• Do not use a single multiple-core cable to connect indoor units that belong to different refrigerant systems. The use of a multiple-core cable may result in signal transmission errors and malfunctions.
• Ensure shield continuity when extending the transmission cable.
  *1 When extending the length of the transmission cables to 1000 m (3280 ft), consult your dealer.

Remote controller cable

| ME remote controller cable| MA remote controller cable
---|---|---
Type| 2-core sheathed cable (unshielded) CVV
Size| 0.3–1.25 mm2 (AWG 22–16) (0.75–1.25 mm2 (AWG 18–16) if a simple remote controller is connected)
Length| Max. 10 m (32 ft)

• If the length exceeds 10 m (32 ft), use a 1.25 mm2 (AWG 16) shielded cable.| Max. 200 m (656 ft)

10-4. System configuration
・Unit code and the maximum number of connectable units

• A transmission booster may be required depending on the number of connected indoor units.
• The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2. The outdoor units are designated as OC, OS1, and OS2 in the order of capacity from large to small (if two or more units have the same capacity, in the order of  address from small to large).

・System configuration example

• The numbers in the parentheses in the figures below indicate address numbers.
  (1) When ME remote controllers are connected

Ⓐ Shielded cable
Ⓑ Sub remote controller
Ⓒ System controller

1 When a power supply unit is not connected to the centralized control transmission cable, move the power jumper from CN41 to CN40 on only one of the outdoor units.
2 If a system controller is used, set SW5-1 on ALL of the outdoor units to ON.

Maximum allowable length of control cables

Transmission cables via outdoor units| L1 + L2 + L3 + L4, L1 + L2 + L3 + L5, L1 + L2 + L6 ≤ 500 m (1640 ft)*3
---|---
Transmission cables| L1, L3 + L4, L3 + L5, L6, L2 + L6 ≤ 200 m (656 ft)
Remote controller cables| ℓ1,   ℓ2,   ℓ3,   ℓ4  ≤ 10 m (32 ft)

• If the length exceeds 10 m (32 ft), the length that exceeds 10 m (32 ft) needs to be included in the maximum allowable length of transmission cables above.

*3 When extending the length of the transmission cables to 1000 m (3280 ft), consult your dealer.

(2) When MA remote controllers are connected

Ⓐ Shielded cable
Ⓑ Sub remote controller
Ⓒ System controller

1 When a power supply unit is not connected to the centralized control transmission cable, move the power jumper from CN41 to CN40 on only one of the outdoor units.
2 If a system controller is used, set SW5-1 on ALL of the outdoor units to ON.
*3 When a PAR-31MAA is connected to a group, no other MA remote controllers can be connected to the same group.

Maximum allowable length of control cables

Transmission cables via outdoor units| L1 + L2 + L3 + L4, L1 + L2 + L6 ≤ 500 m (1640 ft)*4
---|---
Transmission cables| L1, L3 + L4, L6, L2 + L6 ≤ 200 m (656 ft)
Remote controller cables| m1 + m2, m1 + m2 + m3 + m4 ≤ 200 m (656 ft)

*4 When extending the length of the transmission cables to 1000 m (3280 ft), consult your dealer.
(3) When a transmission booster unit is connected

Ⓐ Shielded cable
1 Daisy-chain terminals (TB3) on outdoor units together in the same refrigerant system.
2 Leave the power jumper connected to CN41.

Maximum allowable length of control cables

Transmission cables| L1 + L2 + L3 + L5 + L6, L1 + L2 + L3 + L5 + L7, L1 + L2 + L4, L6 + L5 + L3 + L4, L4 + L3 + L5 + L7 ≤ 200 m (656 ft)
---|---
Remote controller cables| ℓ1,   ℓ2  ≤ 10 m (32 ft)

• If the length exceeds 10 m (32 ft), the length that exceeds 10 m (32 ft) needs to be included in the maximum allowable length of transmission cables above.

10-5. Wiring connections in the control box
WARNING
Connections must be made securely and without tension on the terminals.
– Improperly connected cables may break, overheat, or cause smoke or fire.
10-5-1. Threading power cable through the knockout hole
・Open the front panel when performing wiring work.
・Punch out the knockout holes at the bottom of the front panel or base with a hammer. Use the appropriate knockout hole according to the size of the power cable, referring to the table below.

1. When routing the wiring through the front of the unit

2. When routing the wiring through the bottom of the unit

Ⓐ Cable strap
Ⓑ Power cable
Ⓒ Transmission cable
The length of the section after the cable access hole must be at least 1100 mm (43 in).
Ⓓ Clamp
Ⓔ Ground wire that connects Main Box and Inverter Box

< Notice>

• Do not remove the ground wire that connects Main Box and Inverter Box.
• Install the transmission cable as shown in the figure above so that the cable is long enough for the Main Box to be moved for servicing.
• If there are any gaps around the power cable and transmission cable, please be sure to fill these in with a suitable material to prevent snow from entering, which may cause damage to the electrical parts, and to protect your hands from direct contact with cables.
• When putting the power cable through the knockout hole without using a conduit tube, deburr the hole and protect the power cable with protective tape.
• Use a conduit tube to narrow down the opening if there is a possibility of small animals entering the unit.
• When taking the conduit tube out from the bottom part of the unit, caulk around the tube opening to prevent water infiltration.

10-5-2. Fixing the cables in place
Route the cables as shown in the figures below.
・(E)P200 to 300

・(E)P350 to 500

Take the procedure below.

1. Thread the power cable through the rubber bushing 1. (See 1 and 2 below.)
2. Thread the unit wiring (sensor wiring) and the transmission cable through the rubber bushing 2. (See *1 below.)
3. Hold the power cable and the transmission cable in place respectively with the cable straps.
4. Secure each rubber bushing with the supplied tie band. (See *3 below.)

*1 Make sure the cables are not coming out of the rubber bushing cut.

*2 When threading the wiring through the rubber bushing, make sure the rubber bushing will not come off the sheet metal on the control box.

*3 When tying the supplied tie band around the rubber bushing, make sure to leave no gap between the ends.

10-5-3. Connecting the cables
PUHY-(E)P200 to 300YNW-A

Ⓐ Control box
Ⓑ Power supply terminal block (TB1)
Ⓒ Terminal block for indoor-outdoor transmission cable (TB3)
Ⓓ Terminal block for centralized control transmission cable (TB7)

Ⓐ Terminal block with loose screws
Ⓑ Properly installed terminal block
Ⓒ Spring washers must be parallel to the terminal block.

Ⓐ Power cables, transmission cables
Ⓑ Daisy-chain (transmission cables only)
Ⓒ Terminal blocks (TB1, TB3, TB7)
Ⓓ Make an alignment mark.
Ⓔ Install the ring terminals back to back.

< Notice>

• Connect the cables respectively to the power supply terminal block and the transmission terminal block.
  Erroneous connection does not allow the system to operate.

• Never connect the power cable to the transmission terminal block. If connected, electrical parts will be damaged.

• Transmission cables should be (5 cm (2 in) or more) apart from the power cable so that it is not influenced by electric noise from the power cable. (Do not put the transmission cables and the power cable in the same conduit.)

• Follow the tightening torque for each screw type as shown below. Be careful not to use excessive torque as this could damage the screw.
  Terminal block (TB1 (M6 screw)): 2.5–2.9 [N·m] Terminal block (TB3, TB7 (M3.5 screw)): 0.82–1.0 [N·m]

• When tightening the screws, do not push the driver strongly to avoid damaging the screw.

• Make an alignment mark with a permanent marker across the screw head, washer, and terminal after tightening the screws.

Take the procedure below to connect the cables.

1. Connect the indoor-outdoor transmission cable to TB3.
   If multiple outdoor units are connected to the same refrigerant system, daisy- chain TB3 (M1, M2, earth) on the outdoor units. The indoor-outdoor transmission cable to the indoor unit should be connected to TB3 (M1, M2, earth) of only one of the outdoor units. Connect the shield to the earth terminal.

2. Connect the centralized control transmission cables (between the centralized control system and the outdoor units of different refrigerant systems) to TB7.
   If multiple outdoor units are connected to the same refrigerant system, daisy- chain TB7 (M1, M2, S) on all outdoor units.1 Connect the shield to the S terminal.
   1 If TB7 on the outdoor units in the same refrigerant system are not daisy-chained, connect the centralized control transmission cable to TB7 on the OC. If the OC is out of order, or if centralized control is being conducted during a power supply shut-off, daisy-chain TB7 on the OC, OS1 and OS2. (In the case that the outdoor unit whose power jumper CN41 on the control board has been replaced with CN40 is out of order or the power is shut-off, centralized control will not be conducted even when TB7 is daisy-chained.)

3. When a power supply unit is not connected to the centralized control transmission cable, move the power jumper from CN41 to CN40 on the control board (main board) on only one of the outdoor units.

4. On the outdoor unit whose power jumper was moved from CN41 to CN40, short circuit the S terminal and the earth terminal.

5. Connect terminals M1 and M2 of the transmission terminal block on the indoor unit that has the lowest address in the group to the terminal block on the remote controller.

6. When a system controller is connected, set SW5-1 on all outdoor units to ON.

7. Fix the cables securely in place with the cable strap below the terminal block.

10-6. Address setting
・Set the address setting switch as follows.

| Address setting method| Address
---|---|---
Indoor unit (Main, Sub)| Assign the lowest address to the main indoor unit in the group, and assign sequential addresses to the rest of the indoor units in the same group.| 01 to 50
Outdoor unit (OC, OS1, OS2)| Assign sequential addresses to the outdoor units in the same refrigerant system.

• To set the address to 100, the address setting switch must be set to 50.| 51 to 100
  ME remote controller| Main| Assign an address that equals the address of the main indoor unit in the group plus 100.| 101 to 150
  Sub| Assign an address that equals the address of the main indoor unit in the group plus 150.| 151 to 200
  MA remote controller| Address setting is not required. (The Main/Sub setting is required.)| –

• The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2. The outdoor units are designated as OC, OS1, and OS2 in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large).

• Make indoor unit group settings from remote controllers after turning on the power to all units.

Test run

11-1. Before a test run

CAUTION
After the wiring work has been completed, measure the insulation resistance, and make sure that it reads at least 1 MΩ.
– Failure to do so may result in electric leakage, malfunction, or fire.

Turn on the power at least 12 hours before starting operation. Keep the power turned on throughout the operating season.
– Insufficient energizing will result in malfunction.

• Before performing a test run, turn off the power to the outdoor unit, and disconnect the power cable from the power supply terminal block to measure the insulation resistance.
• Measure the insulation resistance between the power supply terminal block and the earth with a 500 V ohmmeter, and make sure it is at least 1 MΩ.
• If the insulation resistance is 1 MΩ or above, connect the power cable to the power supply terminal, and turn on the power at least 12 hours before starting operation. If the insulation resistance is below 1 MΩ, do not operate the unit, and check the compressor for a earth fault.
• While the unit is turned on, the compressor will remain energized even when it is stopped.
• The insulation resistance between the power supply terminal block and the earth may drop to near 1 MΩ immediately after installation or when the main power to the unit has been turned off for a long time because of the stagnation of refrigerant in the compressor.
• By turning on the main power and energizing the unit for 12 hours or longer, the refrigerant in the compressor will evaporate and the insulation resistance will rise.
• Do not apply an ohmmeter voltage to the terminal block for transmission cables. Doing so will damage the control board.
• Do not measure the insulation resistance of the transmission terminal block of the unit remote controller.
• Check for refrigerant leakage and for loose power cables and transmission cables.
• Check that the liquid and gas side service valves are fully open. Tighten the valve caps.
• Check the phase order of the power supply and the interphase voltage. If the voltage is out of the ±10% range, or if the voltage imbalance is more than 2%, discuss the countermeasure with the customer.
• When a transmission booster unit is connected, turn on the transmission booster unit before turning on the outdoor unit. If the outdoor unit is turned on first, the refrigerant circuit connection information will not be properly verified. If the outdoor unit is turned on first, turn on the transmission booster unit and then power reset the outdoor unit.
• When a power supply unit is connected to the centralized control transmission cable, or when power is supplied from a system controller with a power-supply function, perform a test run with the power supply unit being energized. Leave the power jumper connected to CN41.
• When power is turned on or after power recovery, performance may degrade for approximately 30 minutes.

11-2. Function setting
Make function settings by setting the dipswitches SW4, SW6, and SWP3 on the main board.
Write down the switch settings on the electrical wiring diagram label on the control box front panel for future reference when the control box needs to be replaced.

• Take the following steps to make snow sensor settings. (Snow sensor control will not function when the outdoor temperature sensor (TH7) reading is 6ºC (43ºF) or above.)

1. Set the 10th bit of SW6 to ON.
2. Set SW4 as shown in the table below to select the setting item No.933 or 934. (The setting item No. will be displayed on LED1.)
3. Press SWP3 for two seconds or longer to change the settings. (The settings can be checked on LED3.)

| Setting item No.| SW4 0: OFF, 1: ON 1| Setting (LED3 display) 2
---|---|---|---
1| 2| 3| 4| 5| 6| 7| 8| 9| 10| Unlit| Lit
Snow sensor setting| 933| 1| 0| 1| 0| 0| 1| 0| 1| 1| 1| No. 934 ineffective| No. 934 effective
934| 0| 1| 1| 0| 0| 1| 0| 1| 1| 1| Continuous fan operation| Intermittent fan operation

1 Make the SW4 setting after the unit is energized.
2 This will blink while the system is starting up.
・Make various function settings by setting SW5 and SW6, referring to the table below.

| Setting content| Setting| Switch setting timing
---|---|---|---
OFF| ON
SW5-1| Centralized control switch| Without connection to the centralized controller| With connection to the centralized controller| Before being energized
SW5-2| Deletion of connection information| Normal control| Deletion| Before being energized
SW5-3| –| Preset before shipment| –
SW5-4| –| –
SW5-5| –| –
SW5-6| –| –
SW5-7| –| –
SW5-8| –| –
| Setting content| Setting| Switch setting timing
---|---|---|---
OFF| ON
SW6-1| –| –| –| –
SW6-2| –| –| –| –
SW6-3| –| –| –| –
SW6-4| High static pressure setting| Refer to 1.| Refer to 1.| Before being energized
SW6-5
SW6-6| –| –| –| –
SW6-7| Low-noise mode selection| Performance priority| Low-noise priority| Any time after being energized
SW6-8| Selection of Low-noise or Demand| Low-noise (Night)| Demand| Before being energized
SW6-9| Selection of Diagnostic display or Function detail setting| Refer to 2.| Refer to 2.| Any time after being energized
SW6-10

• Do not change the factory settings of SW5-3 through SW5-8.
• Unless otherwise specified, leave the switch to OFF where indicated by “–,” which may be set to OFF for a reason.
  *1

| SW6-5: ON| SW6-5: OFF
---|---|---
SW6-4: ON| 80 Pa| 60 Pa
SW6-4: OFF| 30 Pa| 0 Pa

*2

| SW6-10: ON| SW6-10: OFF
---|---|---
SW6-9: ON| LED (round type) No. 0 to 1023| LED (7seg) No. 1024 to 2047
SW6-9: OFF| Function setting No. 0 to 1023| LED (7seg) No. 0 to 1023

11-3. Operation characteristics in relation to the refrigerant charge
It is important to have a clear understanding of the characteristics of refrigerant and the operation characteristics of air conditioners before attempting to adjust the refrigerant charge in a given system.

• During cooling operation, the amount of refrigerant in the accumulator is the smallest when all indoor units are in operation.
• During heating operation, the amount of refrigerant in the accumulator is the largest when all indoor units are in operation.
• Refrigerant undercharge creates a tendency for the discharge temperature to rise.
• Changing the amount of refrigerant in the system while there is refrigerant in the accumulator has little effect on the discharge temperature.
• The higher the high pressure level, the more likely it is for the discharge temperature to rise.
• The lower the low pressure level, the more likely it is for the discharge temperature to rise.
• When the amount of refrigerant in the system is adequate, the compressor shell temperature is 10 to 60ºC (50 to 140ºF) higher than the low-pressure saturation temperature. If the temperature difference between the compressor shell temperature and low-pressure saturation temperature is 5ºC (41ºF) or less, refrigerant overcharge is suspected.

11-4. Operation check
The following symptoms are normal and do not indicate a problem.

are already operated in a different mode.
The auto vane automatically switches air flow direction.| Normal display| The auto vane may switch over to horizontal air flow operation from vertical air flow operation in cooling mode if the vertical air flow operation has been running for one hour. At defrost in heating mode or immediately after heating start-up/shutdown, the auto vane automatically switches to horizontal air flow for a short time.
The fan speed automatically changes during heating operation.| Normal display| The fan operates at Very Low speed when the thermostat is turned off, and automatically changes over to the preset speed according to the timer setting or refrigerant temperature when the thermostat is turned on.
The fan stops during heating operation.| “Defrost”| The fan remains stopped during the defrost cycle.
The fan keeps running after the unit has stopped.| No display| After the unit has stopped during heating operation, the fan operates for one minute to exhaust heat.
At the beginning of heating operation, the fan cannot be manually set.| “Stand By”| The fan operates at Very Low speed for five minutes after heating operation starts or until the refrigerant temperature reaches 35°C (95°F), then the fan operates at Low speed for two minutes, and finally the fan operates at the preset speed.
When the main power is turned on, the display as shown right appears on the remote controller for about five minutes.| “HO” or “PLEASE WAIT” blinks.| The system is starting up. Wait until “HO” or “PLEASE WAIT” stops blinking and goes off then try again.
The drain pump keeps running after the unit has stopped.| No display| The drain pump remains in operation for three minutes after the unit in cooling mode has stopped.
The drain pump goes into operation when drain water is detected, even when the unit is stopped.
The indoor unit emits noise when switching from heating to cooling and vice versa.| Normal display| This is a normal sound of the refrigerant circuit operating properly.
Immediately after startup, the indoor unit emits the sound of refrigerant flowing.| Normal display| Unstable flow of the refrigerant produces a sound. This is temporary and does not imply a problem.
r unit that is not performing the heating operation.| Normal display| The LEV is slightly open for preventing any refrigerant, inside of the indoor unit that is not performing the heating operation, from being liquefied. This does not imply a problem.
Drain water comes out of the outdoor unit from the bottom part of the heat exchanger.| No display| This ensures proper drainage of drain water in case the drain water freezes and remains in the outdoor unit during the heating operation at low ambient temperature.

Inspection and maintenance

WARNING
Only qualified personnel must relocate or repair the unit. Do not attempt to disassemble or alter the unit.
– Failure to do so will result in refrigerant leakage, water leakage, serious injury, electric shock, or fire.

• While the unit is turned on, the compressor will remain energized even when it is stopped. Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that the capacitor voltage at the connector (RYPN) has dropped to 20 VDC or less. (It takes about 10 minutes to discharge electricity after the power supply is turned off.)

• Control boxes house high-voltage and high-temperature electrical parts. They may still remain energized or hot after the power is turned off.

• Perform the service after disconnecting the connectors (RYFAN1 and RYFAN2).
  (To plug or unplug connectors, check that the outdoor unit fan is not rotating and that the voltage is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when the outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.)
  Reconnect the connectors (RYFAN1 and RYFAN2) after servicing.

• Unit components may be damaged after long use of the unit, resulting in a performance drop or the unit becoming a safety hazard. To use the unit safely and maximize its life, it is recommended that a maintenance contract with a dealer or qualified personnel be signed. If the contract is signed, service technicians will periodically inspect the unit to identify any damage at an early stage, and take appropriate measures.

• When the outdoor unit is installed on the waterproof sheet, the sheet may become dirty due to the copper component seeped out from the unit. In this case, installing a drain pan for centralized drainage is recommended.

Rating plate information

(1) P models

Model| P200YNW-A| P250YNW-A| P300YNW-A| P350YNW-A| P400YNW-A| P450YNW-A| P500YNW-A
---|---|---|---|---|---|---|---
Unit combination| –| –| –| –| –| –| –
Refrigerant (R410A)| 6.5 kg| 6.5 kg| 6.5 kg| 9.8 kg| 9.8 kg| 10.8 kg| 10.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 225 kg| 225 kg| 228 kg| 278 kg| 278 kg| 294 kg| 337 kg
Model| P400YSNW-A| P450YSNW-A| P500YSNW-A| P550YSNW-A
---|---|---|---|---
Unit combination| P200| P200| P250| P200| P250| P250| P300| P250
Refrigerant (R410A)| 6.5 kg| 6.5 kg| 6.5 kg| 6.5 kg| 6.5 kg| 6.5 kg| 6.5 kg| 6.5 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 225 kg| 225 kg| 225 kg| 225 kg| 225 kg| 225 kg| 228 kg| 225 kg
Model| P600YSNW-A| P650YSNW-A| P700YSNW-A| P750YSNW-A
---|---|---|---|---
Unit combination| P300| P300| P400| P250| P350| P350| P400| P350
Refrigerant (R410A)| 6.5 kg| 6.5 kg| 9.8 kg| 6.5 kg| 9.8 kg| 9.8 kg| 9.8 kg| 9.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 228 kg| 228 kg| 278 kg| 225 kg| 278 kg| 278 kg| 278 kg| 278 kg
Model| P800YSNW-A| P850YSNW-A| P900YSNW-A
---|---|---|---
Unit combination| P450| P350| P450| P400| P450| P450
Refrigerant (R410A)| 10.8 kg| 9.8 kg| 10.8 kg| 9.8 kg| 10.8 kg| 10.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 294 kg| 278 kg| 294 kg| 278 kg| 294 kg| 294 kg
Model| P950YSNW-A| P1000YSNW-A
---|---|---
Unit combination| P450| P250| P250| P400| P350| P250
Refrigerant (R410A)| 10.8 kg| 6.5 kg| 6.5 kg| 9.8 kg| 9.8 kg| 6.5 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 294 kg| 225 kg| 225 kg| 278 kg| 278 kg| 225 kg
Model| P1050YSNW-A| P1100YSNW-A
---|---|---
Unit combination| P400| P400| P250| P400| P350| P350
Refrigerant (R410A)| 9.8 kg| 9.8 kg| 6.5 kg| 9.8 kg| 9.8 kg| 9.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 278 kg| 278 kg| 225 kg| 278 kg| 278 kg| 278 kg
Model| P1150YSNW-A| P1200YSNW-A
---|---|---
Unit combination| P400| P400| P350| P400| P400| P400
Refrigerant (R410A)| 9.8 kg| 9.8 kg| 9.8 kg| 9.8 kg| 9.8 kg| 9.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 278 kg| 278 kg| 278 kg| 278 kg| 278 kg| 278 kg
Model| P1250YSNW-A| P1300YSNW-A
---|---|---
Unit combination| P450| P400| P400| P450| P450| P400
Refrigerant (R410A)| 10.8 kg| 9.8 kg| 9.8 kg| 10.8 kg| 10.8 kg| 9.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 294 kg| 278 kg| 278 kg| 294 kg| 294 kg| 278 kg
Model| P1350YSNW-A
---|---
Unit combination| P450| P450| P450
Refrigerant (R410A)| 10.8 kg| 10.8 kg| 10.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 294 kg| 294 kg| 294 kg

(2) EP models

Model| EP200YNW-A| EP250YNW-A| EP300YNW-A| EP350YNW-A| EP400YNW-A| EP450YNW-A| EP500YNW-A
---|---|---|---|---|---|---|---
Unit combination| –| –| –| –| –| –| –
Refrigerant (R410A)| 6.5 kg| 6.5 kg| 6.5 kg| 9.8 kg| 10.8 kg| 10.8 kg| 10.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 231 kg| 231 kg| 235 kg| 285 kg| 305 kg| 305 kg| 342 kg
Model| EP400YSNW-A| EP450YSNW-A| EP500YSNW-A| EP550YSNW-A
---|---|---|---|---
Unit combination| EP200| EP200| EP250| EP200| EP250| EP250| EP300| EP250
Refrigerant (R410A)| 6.5 kg| 6.5 kg| 6.5 kg| 6.5 kg| 6.5 kg| 6.5 kg| 6.5 kg| 6.5 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 231 kg| 231 kg| 231 kg| 231 kg| 231 kg| 231 kg| 235 kg| 231 kg
Model| EP600YSNW-A| EP650YSNW-A| EP700YSNW-A| EP750YSNW-A
---|---|---|---|---
Unit combination| EP300| EP300| EP400| EP250| EP350| EP350| EP400| EP350
Refrigerant (R410A)| 6.5 kg| 6.5 kg| 10.8 kg| 6.5 kg| 9.8 kg| 9.8 kg| 10.8 kg| 9.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 235 kg| 235 kg| 305 kg| 231 kg| 285 kg| 285 kg| 305 kg| 285 kg
Model| EP800YSNW-A| EP850YSNW-A| EP900YSNW-A
---|---|---|---
Unit combination| EP450| EP350| EP450| EP400| EP450| EP450
Refrigerant (R410A)| 10.8 kg| 9.8 kg| 10.8 kg| 10.8 kg| 10.8 kg| 10.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 305 kg| 285 kg| 305 kg| 305 kg| 305 kg| 305 kg
Model| EP950YSNW-A| EP1000YSNW-A
---|---|---
Unit combination| EP450| EP250| EP250| EP400| EP350| EP250
Refrigerant (R410A)| 10.8 kg| 6.5 kg| 6.5 kg| 10.8 kg| 9.8 kg| 6.5 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 305 kg| 231 kg| 231 kg| 305 kg| 285 kg| 231 kg
Model| EP1050YSNW-A| EP1100YSNW-A
---|---|---
Unit combination| EP400| EP400| EP250| EP400| EP350| EP350
Refrigerant (R410A)| 10.8 kg| 10.8 kg| 6.5 kg| 10.8 kg| 9.8 kg| 9.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 305 kg| 305 kg| 231 kg| 305 kg| 285 kg| 285 kg
Model| EP1150YSNW-A| EP1200YSNW-A
---|---|---
Unit combination| EP400| EP400| EP350| EP400| EP400| EP400
Refrigerant (R410A)| 10.8 kg| 10.8 kg| 9.8 kg| 10.8 kg| 10.8 kg| 10.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 305 kg| 305 kg| 285 kg| 305 kg| 305 kg| 305 kg
Model| EP1250YSNW-A| EP1300YSNW-A
---|---|---
Unit combination| EP450| EP400| EP400| EP450| EP450| EP400
Refrigerant (R410A)| 10.8 kg| 10.8 kg| 10.8 kg| 10.8 kg| 10.8 kg| 10.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 305 kg| 305 kg| 305 kg| 305 kg| 305 kg| 305 kg
Model| EP1350YSNW-A
---|---
Unit combination| EP450| EP450| EP450
Refrigerant (R410A)| 10.8 kg| 10.8 kg| 10.8 kg
Allowable pressure (Ps)| HP: 4.15 MPa, LP: 2.21 MPa
Net weight| 305 kg| 305 kg| 305 kg

This product is designed and intended for use in the residential, commercial and light-industrial environment.
The product at hand is based on the following EU regulations:

• Low Voltage Directive 2014/35/EU
• Electromagnetic Compatibility Directive 2014/30/EU
• Pressure Equipment Directive 2014/68/EU
• Machinery Directive 2006/42/EC

Please be sure to put the contact address/telephone number on this manual before handing it to the customer.
MISUBISHI ELECTRIC CORPORATION
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

KJ79F137H01

References