MITSUBISHI ELECTRIC PFFY Series Air Conditioners Indoor Unit Instruction Manual

4.2. Center of gravity and product weight
[Fig. 4.2.1] (P.3)
A Floor hole for fixing
For PFFY-P-VEM-E

Model name| W
(mm)| L
(mm)| X
(mm)| Y
(mm)| Z
(mm)| Product weight
(kg)
---|---|---|---|---|---|---
PFFY-P2OVEM-E| 730| 76| 40| 365| 320| 29.5
PFFY-P25VEM-E| 730| 76| 40| 365| 320| 29.5
PFFY-P32VEM-E| 730| 76| 40| 365| 320| 30
PFFY-P4OVEM-E| 930| 76| 40| 475| 330| 35
PFFY-P5OVEM-E| 930| 76| 40| 475| 330| 35
PFFY-P63VEM-E| 1130| 76| 40| 595| 340| 39.5

4.3. How to disassemble the unit
The unit needs to be disassembled before installation, piping work, and electrical work.
Perform the work with the unit being laid down sideways.

Caution:
When lifting the unit, do not hold the resign parts. Doing so may damage the resin parts.

1. Open the right and left covers.
   [Fig. 4.3.1] (P.4)
   A Cover

2.  Unscrew the two screws holding the front panel, and remove the right and left covers.
   [Fig. 4.3.2] (P.4)
   B Front panel

3. Remove the front panel.
   Slide the front panel in the direction shown by 1, lift it in the direction shown by 2, and pull it out in the direction shown by 3.
   [Fig. 4.3.3] (P.4)
   B Front panel

4. Unscrew the six screws holding the side panel.
   [Fig. 4.3.4] (P.4)
   C Side panel

5. Remove the side panel.
   Slide the side panel in the direction shown by 1, and lift it up in the direction shown by 2.
   [Fig. 4.3.5] (P.4)

Note:

• Reinstall the panel in the reverse order as shown above.
• Install the front panel so that the clearance between the front panel and the side panel will be even at both sides.
  [Fig. 4.3.6] (P.4)
  A  Leave an equal amount of clearance on the right and left.

4.4. Installing the legs for floor-standing installation
The legs are not used when installing the unit on a wall.

1. Screw down (M5 screws) the legs for floor-standing installation (three places each on the right and left).
   [Fig. 4.4.1] (P.5)
   A Leg

2. Screw down (M4 screws) the cover for the legs (two places each on the right and left).
   [Fig. 4.4.2] (P.5)
   A Leg
   B Cover for leg

3. Unscrew the screws from the cover to remove the cover.
   [Fig. 4.4.3] (P.5)
   A Cover

4.5. Installing the unit on the base
For fixing on the floor

• Installing the unit on a sturdy floor horizontally straight.

• Screw down the unit to the floor with the screws (not supplied).
  [Fig. 4.5.1] (P.5)
  A Floor hole for fixing
  For fixing on the wall

• To fix the indoor unit on the wall, use the hanging bolts.

• When the unit is installed on the wall, vibrations may be transmitted to the wall.
  Take measures against vibrations as needed at the site.
  [Fig. 4.5.2] (P.5)
  A Nuts (field supply)
  B Washers
  C M10 hanging bolt (field supply)

• Ensure that the hanging bolt nuts are tightened to fix the hanging bolts.

• To ensure that drain is discharged, be sure to hang the unit at level using a level.

Caution:
Install the unit in horizontal position. If the side with drain port is installed
higher, water leakage may be caused.
4.6. Installing the pipes under the floor when installing the unit on the wall
Unscrew the five screws and remove the right cover to install the pipes under the floor. [Fig. 4.6.1] (P.5) A Cover
Note:

• Do not remove the cover when installing the pipes on the rear of the unit.

4.7. Installing the back decoration panel (sold separately)
Applicable only for floor-standing installation Install the back decoration panel (sold separately) before installing the unit on a base.
Refer to the installation manual that came with the back decoration panel (sold separately) for how to install the back decoration panel.

Refrigerant pipe and drain pipe specifications

To avoid dew drops, provide sufficient antisweating and insulating work to the refrigerant and drain pipes. When using commercially available refrigerant pipes, be sure to wind commercially available insulating material (with a heat-resisting temperature of more than 100 °C and thickness given below) onto both liquid and gas pipes. Insulate all indoor pipes with form polyethylene insulation with a minimum density of 0.03 and a thickness as specified in the table below.

5.1. Refrigerant pipe and drain pipe specifications

Model
Item| | PFFY-P-VEM-E
---|---|---
20.25.32.40.50| | 63
Refrigerant pipe
(Brazing connection)| Liquid pipe| ∅6.35| | ∅9.52
Gas pipe| ∅12.7| | ∅15.88
Drain pipe| | O.D. ∅ 32

5.2. Refrigerant pipe, drain pipe
[Fig. 5.2.1] (P.6)
A Refrigerant piping (liquid)
B Refrigerant piping (gas)
C Drain outlet

1. Select the thickness of insulating material by pipe size.
   Pipe size| Insulating material’s thickness
   ---|---
   6.4 mm to 25.4 mm| More than 10 mm
   28.6 mm to 38.1 mm| More than 15 mm
2.  If the unit is used on the highest story of a building and under conditions of high temperature and humidity, it is necessary to use pipe size and insulating material’s thickness more than those  given in thetable above.
3. If there are customer’s specifications, simply follow them.

Connecting refrigerant pipes and drain pipes

6.1. Refrigerant piping work
This piping work must be done in accordance with the installation manuals for both outdoor unit and BC controller (simultaneous cooling and heating series R2).

• Series R2 is designed to operate in a system that the refrigerant pipe from an outdoor unit is received by BC controller and branches at the BC controller to connect between indoor units.
• For constraints on pipe length and allowable difference of elevation, refer to the outdoor unit manual.
• The method of pipe connection is brazing connection.

Caution:
• Install the refrigerant piping for the indoor unit in accordance with the following.

1.  Cut the tip of the indoor unit piping, remove the gas, and then remove the brazed cap. [Fig. 6.1.1] (P.6)
   A Cut here
   B Remove brazed cap

2. Pull out the thermal insulation on the site refrigerant piping, braze the unit piping, and replace the insulation in its original position. Wrap the piping with insulating tape.

Note:

• When brazing the refrigerant pipes, be sure to braze, after covering a wet cloth to the pipes of the units in order to prevent it from burning and shrinking by heat.
  [Fig. 6.1.2] (P.6)
  A Cool by a wet cloth

• Pay strict attention when wrapping the copper piping since wrapping the piping may cause condensation instead of preventing it.

[Fig. 6.1.3] (P.6)
A Thermal insulation
C Wrap with damp cloth
E Ensure that there is no gap here
B Pull out insulation
D Return to original position
F Wrap with insulating tape

Cautions On Refrigerant Piping

• Be sure to use non-oxidative brazing for brazing to ensure that no foreign matter or moisture enter into the pipe.
• Be sure to apply refrigerating machine oil over the flare connection seating surface and tighten the connection using a double spanner.
• Provide a metal brace to support the refrigerant pipe so that no load is imparted to the indoor unit end pipe. This metal brace should be provided 50 cm away from the indoor unit’s flare connection.

Warning:
Do not use refrigerant other than the type indicated in the manuals provided with the unit and on the nameplate.

• Doing so may cause the unit or pipes to burst, or result in explosion or fire during use, during repair, or at the time of disposal of the unit.
• It may also be in violation of applicable laws.
•  MITSUBISHI ELECTRIC CORPORATION cannot be held responsible for malfunctions or accidents resulting from the use of the wrong  type of refrigerant.

Caution:

• Use refrigerant piping made of C1220 (Cu-DHP) phosphorus deoxidized copper as specified in the JIS H3300 “Copper and copper alloy seamless pipes and tubes”. In addition, be sure that the inner and outer surfaces of the pipes are clean and free of  azardous sulphur, oxides, dust/dirt, shaving particles, oils, moisture, or any other contaminant.

• Never use existing refrigerant piping.
  – The large amount of chlorine in conventional refrigerant and refrigerator oil in the existing piping will cause the new refrigerant to deteriorate.

• Store the piping to be used during installation indoors and keep both ends of the piping sealed until just before brazing.
  – If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate and the compressor may fail.

• Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections.
  – The refrigerant used in the unit is highly hygroscopic and mixes with water and will degrade the refrigerator oil.

6.2. Drain piping work

• Ensure that the drain piping is downward (pitch of more than 1/100) to the outdoor (discharge) side. Do not provide any trap or irregularity on the way. (1)
• Ensure that any cross-wise drain piping is less than 20 m (excluding the difference of elevation). If the drain piping is long, provide metal braces to prevent it from waving. Never provide any air vent pipe. Otherwise drain may be ejected.
• Use a hard vinyl chloride pipe VP-25 (with an external diameter of 32 mm) for drain piping.
• Do not provide any odor trap at the drain discharge port.
• Put the end of the drain piping in a position where no odor is generated. • Do not put the end of the drain piping in any drain where ionic gases are generated.

[Fig. 6.2.1] (P.6)
A Downward slope 1/100 or more
B Drain hose (Accessory)
C Indoor unit
D Collective piping

1. Insert the drain hose (accessory) into the drain port. The connecting part between the indoor unit and the drain hose may be disconnected at the maintenance. Fix the part with the accessory band, not be adhered.
2. Attach the drain pipe (O.D. ø32 PVC TUBE, field supply). (Attach the pipe with glue for the hard vinyl chloride pipe, and fix it with the band (small, accessory).)
3. Perform insulation work on the drain pipe (O.D. ø32 PVC TUBE) and on the socket (including elbow).

[Fig. 6.2.2] (P.6)
A Indoor unit
B Tie band (accessory)
C Band fixing part
D Insertion margin
E Drain hose (accessory)
F Drain pipe (O.D. ø32 PVC TUBE, field supply)
G Insulating material (field supply)

Electrical wiring

Precautions on electrical wiring

Warning:
Electrical work should be done by qualified electrical engineers in accordance with “Engineering Standards For Electrical Installation” and supplied installation manuals. Special circuits should also be used. If the power circuit lacks capacity or has an installation failure, it may cause a risk of electric shock or fire.

1.  Be sure to install an earth leakage breaker to the power.
2. Install the unit to prevent that any of the control circuit cables (remote controller, transmission cables) is brought in direct contact with the power cable outside the unit.
3. Ensure that there is no slack on all wire connections.
4. Some cables (power, remote controller, transmission cables) above the ceiling may be bitten by mouses. Use as many metal pipes as possible to insert the cables into them for protection.
5. Never connect the power cable to leads for the transmission cables. Otherwise the cables would be broken.
6. Be sure to connect control cables to the indoor unit, remote controller, and the outdoor unit.
7. Put the unit to the ground on the outdoor unit side.
8. Select control cables from the conditions given below.

Caution:

• Be sure to put the unit to the ground on the outdoor unit side. Do not connect the earth cable to any gas pipe, water pipe, lightening rod, or  telephone earthcable.  Incomplete groundingmay cause a risk of electric shock.
•  If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified persons in order to avoid a hazard.
• 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

| MA remote controller| ME remote controller
---|---|---
Type| 2-core cable VCTF, VCTFK, CW, VVR, VVF, or VCT| 2-core shielded cable CVVS, CPEVS, or MWS
Size| 0.3 to 1.25 mm2 (AWG 22 to 16) 1 4| 0.3 to 1.25 mm2 (AWG 22 to 16) 1
Length| Max. 200 m (656 ft) 3| Max. 10 m (32 ft) *2

1 The use of cables that are smaller than 0.75 mm² (AWG 18) is recommended for easy handling.
2 The section of the cable that exceeds 10 m [32 ft] must be included in the maximum indoor-outdoor transmission cable distance.
3 Max. 70 m (229 ft) for PAR-CT01MA series
4 To wire PAR-CT01MA series, PAR-FS01MA series, PAR-40MA series, PAR-30MA series, or Simple MA remote controller, use a cable with a size of 0.3 mm² (AWG 22).

7.1. Power supply wiring

• Use dedicated power supplies for the outdoor unit and indoor unit.
• Bear in mind ambient conditions (ambient temperature, direct sunlight, rain water, etc.) when proceeding with the wiring and connections.
•  The wire size is the minimum value for metal conduit wiring. If the voltage drops, use a wire that is one rank thicker in diameter. Make sure the power-supply voltage does not drop more than 10%.
•  Specific wiring requirements should adhere to the wiring regulations of the region.
• Power supply cords of appliances shall not be lighter than design 60245 IEC 57 or 60227 IEC 57.
• A switch with at least 3 mm contact separation in each pole shall be provided by the Air conditioner installation.

[Fig. 7.1.1] (P.7)
A Ground-fault interrupter
B Local switch/Wiring breaker
C Indoor unit
D Pull box

Total operating current of the Indoor unit| Minimum wire thickness (mm2)| Ground-fault interrupter 1| Local switch (A)| Breaker for wiring (A)
(Non-fuse breaker)
---|---|---|---|---
Main cable| Branch| Ground| Capacity| Fuse
FO = 16 A or less 2| 1.5| 1.5| 1.5| 20 A current sensitivity 3| 16| 16| 20
FO = 25 A or less 2| 2.5| 2.5| 2.5| 30 A current sensitivity 3| 25| 25| 30
FO = 32 A or less 2| 4.0| 4.0| 4.0| 40 A current sensitivity *3| 32| 32| 40

Apply to IEC61000-3-3 about Max. Permissive System Impedance.
1 The Ground-fault interrupter should support Inverter circuit.
The Ground-fault interrupter should combine using of local switch or wiring breaker.
2 Please take the larger of F1 or F2 as the value for F0.
F1 = Total operating maximum current of the indoor units x 1.2
F2 = {V1 x (Quantity of Type1)/C} + {V1 x (Quantity of Type2)/C} + {V1 x (Quantity of Type3)/C} + {V1 x (Quantity of Others)/C}

C : Multiple of tripping current at tripping time 0.01s
Please pick up “C” from the tripping characteristic of the breaker.
<Example of “F2” calculation>
Condition PFFY-VEM x 6, C = 8 (refer to right sample chart) F2 = 18.6 x 6/8 = 13.95 x 16 A breaker (Tripping current = 8 x 16 A at 0.01s)
3 Current sensitivity is calculated using the following formula.
G1 = (V2 x Quantity of Type1) + (V3 x Wire length [km])

Warning:

• Be sure to use specified wires for connections and ensure no external force is imparted to terminal connections. If connections are not fixed firmly, heating or fire may result.
• Be sure to use the appropriate type of overcurrent protection switch. Note that generated overcurrent may include some amount of direct current.

Caution:

• Some installation sites may require attachment of an earth leakage breaker for the inverter. If no earth leakage breaker is installed, there is a danger of electric shock.
• Do not use anything other than the correct capacity breaker and fuse. Using fuse, wire or copper wire with too large capacity may cause a risk of malfunction or fire.

Notes:

• This device is intended for the connection to a power supply system with a maximum permissible system impedance (Refer to IEC61000-3-3.) at the interface point (power service box) of the user’s supply.
• The user must ensure that this device 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.

7.2. Connecting remote controller, indoor and outdoor transmission cables

•  Connect indoor unit TB5 and outdoor unit TB3. (Non-polarized 2-wire) The “S” on indoor unit TB5 is a shielding wire connection. For specifications about the connecting cables, refer to the outdoor unit installation manual.

•  Install a remote controller following the manual supplied with the remote controller.

• Connect the “1” and “2” on indoor unit TB15 to a MA remote controller. (Nonpolarized 2-wire)

• Connect the “M1” and “M2” on indoor unit TB5 to a M-NET remote controller.
  (Non-polarized 2-wire)

• Connect the remote controller’s transmission cable within 10 m using a 0.75 mm² junction cable. core cable. If the distance is more than 10 m, use a 1.25 mm²

[Fig. 7.2.1] (P.7) MA Remote controller
[Fig. 7.2.2] (P.7) M-NET Remote controller
A Terminal block for indoor transmission cable
B Terminal block for outdoor transmission cable
C Remote controller

• DC 9 to 13 V between 1 and 2 (MA remote controller)
• DC 24 to 30 V between M1 and M2 (M-NET remote controller)

[Fig. 7.2.3] (P.7) MA Remote controller
[Fig. 7.2.4] (P.7) M-NET Remote controller

A Non-polarized
B TB15
C Remote Controller
D TB5

• The MA remote controller and the M-NET remote controller cannot be used at the same time or interchangeably.

Caution:
Install wiring so that it is not tight and under tension. Wiring under tension may break, or overheat and burn.

7.3. How to mount remote controller

1. Dismount the upper part of remote controller, and fasten the base of the controller at the indicated positions with screws provided. (Be careful not to cut the wiring inside the controller.) [Fig. 7.3.1] (P.7)

2. Connect the transmission terminal bed inside the control box and the terminal bed of the remote controller through the notch. [Fig. 7.3.2] (P.7)
   A Notch for transmission line

3. After completing the work of the above items 1 and 2, insert the upper part of remote controller into its original position.

Note:

• Unscrew the two screws holding the base of the controller to remove the remote controller. [Fig. 7.3.3] (P.7)

7.4. Connecting electrical connections
Please identify the model name of the operation manual attached on the terminal box cover with that shown on the rating name plate.

1. Remove the screws holding the cover to dismount the cover. [Fig. 7.4.1] (P.8)
   A Screw holding cover (4pcs.)
   B Cover

2.  Open knockout holes (Recommend to use a screwdriver or the like for this work.)

3. Fix power source wiring to terminal box by using buffer bushing for tensile force. (PG connection or the like.) Connect transmission wiring to transmission terminal block through the knockout hole of terminal box using ordinary bushing.

4. Connect the power source, Earth, transmission and remote controller wiring.
   The dismounting of the terminal box is not needed.
   [Fig. 7.4.2] (P.8)
   A Terminal bed box
   B Knockout hole
   C Remove [Shield wire connection] [Fig. 7.4.3] (P.8)

A Use a cable tie to secure the cable.
B Use PG bushing to keep the weight of the cable and external force from being applied to the power supply terminal connector.
C Power source wiring
D Use ordinary bushing
E Power source terminal block
F Terminal block for indoor transmission
G Terminal block for remote controller
H To 1-phase power source
I Transmission line 30 VDC
J Transmission line to the remote controller, terminal block for indoor unit and BC controller

5. After wiring is complete, make sure again that there is no slack on the connections, and attach the cover onto the terminal box in the reverse order of removal.

Notes:

• Do not pinch the cables or wires when attaching the terminal box cover.
  Doing so may cause a risk of disconnection.

• When accommodating the terminal box, make sure that the connectors on the box side are not removed. If removed, it cannot operate normally.

7.5. External I/O specifications
Caution:

1. Wiring should be covered by insulation tube with supplementary insulation.
2.  Use relays or switches with IEC or equivalent standard.
3.  The electric strength between accessible parts and control circuit should have 2750 V or more.

7.6. Setting addresses
(Be sure to operate with the main power turned OFF.)
[Fig. 7.6.1] (P.8)