MITSUBISHI ELECTRIC PEA-M100 Air Conditioners Installation Guide

MITSUBISHI ELECTRIC PEA-M100 Air Conditioners

Product Information

Specifications

• Model: PEA-M100, PEA-M125, PEA-M140, PEA-M160HAA
• Type: Air-Conditioner
• Language: English

Product Usage Instructions

1. Safety Precautions

Before installing the unit, it is crucial to read and follow all safety precautions provided in the manual. These precautions contain important information regarding safety. Additionally, it is recommended to report to or seek consent from the supply authority before connecting the unit to the system.

MEANINGS OF SYMBOLS ON THE UNIT

The symbols on the unit provide important information:

• Only for R32: This symbol indicates that the unit uses R32 refrigerant, which is flammable. It is essential to be cautious of refrigerant leaks, fire, and heat-generating parts as they may result in harmful gas and fire risks.
• Read the OPERATION MANUAL carefully before operation: Service personnel should carefully read the OPERATION MANUAL and INSTALLATION MANUAL before operating the unit.
• Further information is available in the OPERATION MANUAL, INSTALLATION MANUAL, and the like: Additional information can be found in these manuals.
• Warning: This symbol indicates potential risks that could lead to death or serious injury.
• Caution: This symbol indicates important instructions that must be followed.
• Indicates a part which must be grounded: Pay attention to parts that require grounding.
• Indicates that caution should be taken with rotating parts: Be cautious of rotating parts.
• Indicates that the main switch must be turned off before servicing: Always turn off the main switch before servicing.
• Beware of electric shock: Be cautious of electric shock.
• Beware of hot surface: Be cautious of hot surfaces.
• Warning: Carefully read the labels affixed to the main unit: Read and understand the labels on the main unit.

Selecting the Installation Location

Indoor Unit

When selecting the installation location for the indoor unit, consider the following:

• Choose a location with sufficient space and proper ventilation for the unit to operate efficiently.
• Ensure the ceiling is strong enough to support the weight of the indoor unit if it is a ceiling-mounted installation.
• Avoid installing the unit in areas where it may be exposed to direct sunlight or heat sources such as stoves or ovens.
• Keep the unit away from areas with high humidity or excessive dust accumulation.

2.2 Outdoor Unit

When selecting the installation location for the outdoor unit, consider the following:

• Choose a location that allows proper airflow and is free from obstructions.
• Ensure the unit is placed on a stable and level surface to prevent noise and vibration issues.
• Avoid installing the unit near windows, doors, or areas where the noise may cause disturbance.
• Protect the unit from direct exposure to sunlight, rain, and other weather elements.

FAQs

Q: Can I use a different refrigerant than the one specified for the system?

A: No, using a refrigerant other than the one specified for the system may cause damage to the unit and result in hazards. It is important to use only the refrigerant specified in the manual.

Q: What should I do if I encounter abnormally high pressure in the refrigerant lines?

A: Abnormal high pressure in the refrigerant lines may indicate air mixed with the refrigerant. In such cases, it is recommended to contact a qualified service personnel to address the issue and ensure safe operation of the unit.

Note: The phrase “Wired remote controller” in this installation manual refers only to the PAR-41MAA. If you need any information for the other remote controller, please refer to either the installation manual or initial setting manual which are included with the remote controller.

Safety precautions

• Before installing the unit, make sure you read all the “Safety Precautions”.
• The “Safety Precautions” provide very important points regarding safety. Make sure you follow them.
• Please report to or take consent by the supply authority before connection to the system.

MEANINGS OF SYMBOLS ON THE UNIT

| WARNING

(Risk of fire)

| This symbol is only for R32 refrigerant. The type of the refrigerant used is written on the nameplate on the outdoor unit.

R32 refrigerant is flammable. If the refrigerant leaks, or comes in contact with fire or parts that generate heat, it may create harmful gas and pose a risk of fire.

---|---|---
| Read the OPERATION MANUAL carefully before operation.
****| Service personnel are required to carefully read the OPERATION MANUAL and INSTALLATION MANUAL before operation.
| Further information is available in the OPERATION MANUAL, INSTALLATION MANUAL, and the like.

• Please report to or take consent by the supply authority before connection to the system.
• Be sure to read “Safety precautions” before installing the air conditioner.
• Be sure to observe the cautions specified here as they include important items related to safety.
• The indications and meanings are as follows.

Warning:
Could lead to death, serious injury, etc.
Caution:
Could lead to serious injury in particular environments when operated incorrectly.

Symbols put on the unit

• : Indicates an action that must be avoided.
• : Indicates that important instructions must be followed.
• : Indicates a part which must be grounded.
• : Indicates that caution should be taken with rotating parts.
• : Indicates that the main switch must be turned off before servicing.
• : Beware of electric shock.
• : Beware of hot surface.

Warning:
Carefully read the labels affixed to the main unit.

• Do not install it by yourself (customer).
  Incomplete installation could cause injury due to fire, electric shock, the unit falling or leakage of water. Consult the dealer from whom you purchased the unit or special installer.

• Servicing shall be performed only as recommended by the manufacturer.

• This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.

• This appliance is intended to be used by expert or trained users in shops, in light industry and on farms, or for commercial use by lay persons.

• Install the unit securely in a place which can bear the weight of the unit. When installed in an insufficient strong place, the unit could fall causing injured.

• Use the specified wires to connect the indoor and outdoor units securely and attach the wires firmly to the terminal board connecting sections so the stress of the wires is not applied to the sections.
  Incomplete connecting and fixing could cause fire.

• Do not use intermediate connection of the power cord or the extension cord and do not connect many devices to one AC outlet.

• It could cause a fire or an electric shock due to defective contact, defective insulation, exceeding the permissible current, etc.

• Check that the refrigerant gas does not leak after installation has completed.

• Perform the installation securely referring to the installation manual. Incomplete installation could cause a personal injury due to fire, electric shock, the unit falling or leakage of water.

• Perform electrical work according to the installation manual and be sure to use an exclusive circuit.
  If the capacity of the power circuit is insufficient or there is incomplete electrical work, it could result in a fire or an 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.

• Attach the electrical part cover to the indoor unit and the service panel to the outdoor unit securely.
  If the electrical part cover in the indoor unit and/or the service panel in the outdoor unit are not attached securely, it could result in a fire or an electric shock due to dust, water, etc.

• Be sure to use the part provided or specified parts for the installation work. The use of defective parts could cause an injury or leakage of water due to a fire, an electric shock, the unit falling, etc.

• Ventilate the room if refrigerant leaks during operation.
  If the refrigerant comes in contact with a flame, poisonous gases will be released.

• Children should be supervised to ensure that they do not play with the appliance.

• The installer and system specialist shall secure safety against leakage according to local regulation or standards.

  • The instructions in this manual may be applicable if local regulation are not available.

• Pay a special attention to the place, such as a basement, etc. where refrigeration gas can stay, since refrigeration is heavier than the air.

• When installing, relocating, or servicing the air conditioner, use only the specified refrigerant written on the outdoor unit to charge the refrigerant lines. Do not mix the refrigerant with any other refrigerant, and do not allow air to remain in the lines.

  • If air is mixed with the refrigerant, then it may cause abnormal high pressure in the refrigerant lines, resulting in an explosion and other hazards.
  • The use of any refrigerant other than that specified for the system will cause mechanical failure, system malfunction, or unit breakdown. In the worst case, this could lead to a serious impediment to securing product safety.
  • 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.

• This indoor unit should be installed in a room which is equal to or larger than the floor space specified in the outdoor unit installation manual. Refer to the outdoor unit installation manual.

• Only use means recommended by the manufacturer to accelerate the defrosting process or to clean.

• This indoor unit shall be stored in a room that has no continuously-operating ignition device such as open flame, gas appliance, or electrical heater.

• Do not pierce a hole in or burn this indoor unit or refrigerant lines.

• Be aware that the refrigerant may be odour-free.

• Pipe-work shall be protected from physical damage.

• The installation of pipe-work shall be kept to a minimum.

• Compliance with national gas regulations shall be observed.

• Keep any required ventilation openings clear of obstruction.

• Do not use low temperature solder alloy when brazing the refrigerant pipes.

• When performing brazing work, be sure to ventilate the room sufficiently. Make sure that there are no hazardous or flammable materials nearby. When performing the work in a closed room, small room, or similar location, make sure that there are no refrigerant leaks before performing the work. If refrigerant leaks and accumulates, it may ignite or poisonous gases may be released.

• For installation and relocation work, follow the instructions in the installation manual and use tools and pipe components specifically made for using with refrigerant specified in the outdoor unit installation manual.

• The appliance shall be stored so as to prevent mechanical damage from occurring.

• If the air conditioner is installed in a small room or closed room, measures must be taken to prevent the refrigerant concentration in the room from exceeding the safety limit in the event of refrigerant leakage. Should the refrigerant leak and cause the concentration limit to be exceeded, hazards due to lack of oxygen in the room may result.

Caution:

• Perform grounding.
  Do not connect the ground wire to a gas pipe, water pipe arrester or telephone ground wire. Defective grounding could cause an electric shock.

• Do not install the unit in a place where an inflammable gas leaks.
  If gas leaks and accumulates in the area surrounding the unit, it could cause an explosion.

• Install a ground leakage breaker depending on the installation place (where it is humid).
  If a ground leakage breaker is not installed, it could cause an electric shock.

• Perform the drainage/piping work securely according to the installation manual.
  If there is a defect in the drainage/piping work, water could drop from the unit and household goods could be wet and damaged.

• Fasten a flare nut with a torque wrench as specified in this manual.
  When fastened too tight, a flare nut may broken after a long period and cause a leakage of refrigerant.

• To reduce the risk of injury from metal sheet edges, wear protective gloves.

Selecting the installation location

Indoor unit

• Where airflow is not blocked.
• Where cool air spreads over the entire room.
• Where it is not exposed to direct sunshine.
• At a distance 1 m or more away from your TV and radio (to prevent picture from being distorted or noise from being generated).
• In a place as far away as possible from fluorescent and incandescent lights (so the infrared remote control can operate the air conditioner normally).
• Where the air filter can be removed and replaced easily.
• Indoor units must be installed in a ceiling with a minimum height of 2.5 meters.

Warning:
Mount the indoor unit into a ceiling strong enough to withstand the weight of the unit.

Outdoor unit

• Where it is not exposed to strong wind.
• Where airflow is good and dustless.
• Where it is not exposed to rain and direct sunshine.
• Where neighbours are not annoyed by operation sound or hot air.
• Where rigid wall or support is available to prevent the increase of operation sound or vibration.
• Where there is no risk of combustible gas leakage.
• When installing the unit at a high level, be sure to fix the unit legs.
• Where it is at least 3 m away from the antenna of TV set or radio. (Otherwise, images would be disturbed or noise would be generated.)
• Install the unit horizontally.

Caution:
Avoid the following places for installation where air conditioner trouble is liable to occur.

• Where there is too much machine oil.
• Salty environment as seaside areas.
• Hot-spring areas.
• Where sulfide gas exists.
• Other special atmospheric areas.

Selecting an installation site & Accessories

• Select a site with sturdy fixed surface sufficiently durable against the weight of unit.
• Before installing unit, the routing to carry in unit to the installation site should be determined.
• Select a site where the unit is not affected by entering air.
• Select a site where the flow of supply and return air is not blocked.
• Select a site where refrigerant piping can easily be led to the outside.
• Select a site which allows the supply air to be distributed fully in room.
• Do not install unit at a site with oil splashing or steam in much quantity.
• Do not install unit at a site where combustible gas may generate, flow in, stagnate or leak.
• Do not install unit at a site where equipment generating high frequency waves (a high frequency wave welder for example) is provided.
• Do not install unit at a site where fire detector is located at the supply air side. (Fire detector may operate erroneously dew to the heated air supplied during heating operation.)
• When special chemical product may scatter around such as site chemical plants and hospitals, full investigation is required before installing unit. (The plastic components may be damaged depending on the chemical product applied.)
• If the unit is run for long hours when the air above the ceiling is at high temperature/high humidity (dew point above 26 °C), dew condensation may be produced in the indoor unit. When operating the units in this condition, add insulation material (10-20 mm) to the entire surface of the indoor unit to avoid dew condensation.

Install the indoor unit on a ceiling strong enough to sustain its weight

Warning:
The unit must be securely installed on a structure that can sustain its weight. If the unit is mounted on an unstable structure, it may fall down causing injuries.

Securing installation and service space
Secure enough access space to allow for the maintenance, inspection, and replacement of the motor, fan, drain pump, heat exchanger, and electric box in one of the following ways.
Select an installation site for the indoor unit so that its maintenance access space will not be obstructed by beams or other objects.

1. When a space of 300mm or more is available below the unit between the unit and the ceiling. [Fig. 3-2-1]
   • Create access door 1 and 2 as shown in [Fig. 3-2-2]. (Access door 2 is not required if enough space is available below the unit for a maintenance worker to work in.)
   • An access hole of the same size as the access door 3 as shown in [Fig. 3-2-4] is required to access drain pan or heat exchanger for replacement. (Required only when the ceiling material cannot be removed.)
2. When a space of less than 300mm is available below the unit between the unit and the ceiling.Create access door 3 below the electric box and the unit as shown in [Fig. 3-2-4].[Fig. 3-2-1]

Warning:

• This unit should be installed in rooms which exceed the floor space specified in outdoor unit installation manual. Refer to outdoor unit installation manual.
• Install the indoor unit at least 2.5m above floor or ground level. For appliances not accessible to the general public.
• Refrigerant pipes connection shall be accessible for maintenance purpose.

Indoor unit accessories
The unit is provided with the following accessories:

Fixing hanging bolts

Fixing hanging bolts

(Give site of suspension strong structure.)

Hanging structure

• Ceiling: The ceiling structure varies from building to one another. For detailed information, consult your construction company.
• If necessary, reinforce the hanging bolts with anti-quake supporting members as countermeasures against earthquakes.
• Use M10 for hanging bolts and anti-quake supporting members (field supply).
  1. Reinforcing the ceiling with additional members (edge beam, etc.) must be required to keep the ceiling at level and to prevent the ceiling from vibrations.
  2. Cut and remove the ceiling members.
  3. Reinforce the ceiling members, and add other members for fixing the ceiling boards.

Installing the unit

Moving the unit to ceiling space

1. When the fan unit does not need to be separated from the coil unit
2. Bring the indoor unit to an installation site as it is packed.
3. To hang the indoor unit, use a lifting machine to lift and pass through the hanging bolts. [Fig. 5-1-1][Fig. 5-1-1]

  *  **A.** Unit body
  *  **B.** Lifting machine

2. When the fan unit needs to be separated from the coil unit
3. Bring the indoor unit to an installation site as it is packed.
4. Before separating the fan unit from the coil unit, remove the inlet flange and the control box cover to remove the cable of the heat exchanger thermistor. [Fig. 5-1-2][Fig. 5-1-2]
5. Remove the connector (CN44) of the thermistor cable from the circuit board, thread the thermistor cable through the rubber bush of the control box and the connection flange, and place the thermistor in the connection flange. [Fig. 5-1-3]
6. ④ Remove all the screws Ⓐ through Ⓕ connected to the coil unit from inside of the fan box to separate the fan unit. Screw holes Ⓖ and Ⓗ shown in Fig. 5-1-4 are double- snowman-shaped. Do not unscrew the screws Ⓖ and Ⓗ all the way; only loosen them partway. To separate the fan unit from the coil unit, lift the fan unit and move it away from the coil unit. The coil unit has an insulation material attached to its bottom (on the drain-pan side). Do not drag the coil unit when moving it. [Fig. 5-1-4]
7. After moving the unit to the ceiling space, thread the screws Ⓖ and Ⓗ through the double-snowman-shaped holes on the fan unit, and re-tighten the screws Ⓐ through Ⓗ to connect the fan unit and the coil unit.
8. Reconnect the thermistor cable to the circuit board, and close the control box cover.
9. Attach the inlet flange to the inlet so that the oval protrusions face outside the unit. Tighten the inlet flange screws to a torque no greater than 1.4 Nm. [Fig. 5-1-5]

Hanging the unit body

1. Attach a washer and nut(s) to each suspension bolt. (The nuts are to be supplied locally.)
2. Fit the indoor unit to each suspension bolt.
3. Make sure that the unit is positioned level, then tighten each nut.

• A. Nuts (field supply)
• B. Washer (with cushion)
• C. Washer (without cushion)
• D. M10 Hanging bolt (field supply)

Caution:
Do not suspend either the fan unit or the coil unit alone. The two units must be connected to each other before being suspended.

Confirming the unit’s position and fixing hanging bolts

• Use the gage supplied with the panel to confirm that the unit body and hanging bolts are positioned in place. If they are not positioned in place, it may result in dew drops due to wind leak. Be sure to check the positional relationship.
• Install the unit horizontally, using a level. 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:
Be sure to install the unit body at level.

Refrigerant piping work

Refrigerant pipe

• A. Indoor unit
• B. Outdoor unit

Refer to the Instruction Manual that came with the outdoor unit for the restrictions on the height difference between units and for the amount of additional refrigerant charge.

• For PEA-M160 model, the method of gas pipe connection is brazing connection.
  • Use the pipe reducer to connect with outdoor unit PUZ-ZM160.

Avoid the following places for installation where air conditioner trouble is liable to occur.

• Where there is too much oil such as for machine or cooking.
• Salty environment as seaside areas.
• Hot-spring areas.
• Where sulfide gas exists.
• Other special atmospheric areas.
• This unit has flared connections on both indoor and outdoor sides. [Fig. 6-1]
• Insulate both refrigerant and drainage piping completely to prevent condensation.

Piping preparation

• Refrigerant pipes of 3, 5, 7, 10 and 15 m are available as optional items.

1.  Table below shows the specifications of pipes commercially available.
   Model| Pipe| Outside diameter| Min wall thickness| Insulation thickness| Insulation material|
   ---|---|---|---|---|---|---
   mm| inch|
   PEA-| For liquid| 9.52| 3/8| 0.8 mm| 8 mm| |
   M100,| Heat resisting|
   For gas| 15.88| 5/8| 1.0 mm| 8 mm|
   125, 140| foam plastic|
   | For liquid| 9.52| 3/8| 0.8 mm| 8 mm|
   PEA- M160| 0.045 specific

gravity

|
For gas| 19.05| 3/4| 1.2 mm| 8 mm|
2. Ensure that the 2 refrigerant pipes are well insulated to prevent condensation. 3. Refrigerant pipe bending radius must be 10 cm or more.
Caution:
Using careful insulation of specified thickness. Excessive thickness prevents storage behind the indoor unit and smaller thickness causes dew drippage.

Flaring work

• Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure.

Pipe cutting

• A. Copper tubes
• B. Good
• C. No good
• D. Tilted
• E. Uneven
• F. Burred

Using a pipe cutter cut the copper tube correctly.

Burrs removal

• A. Burr
• B. Copper tube/pipe
• C. Spare reamer
• D. Pipe cutter

Completely remove all burrs from the cut cross section of pipe/tube.
Put the end of the copper tube/pipe to downward direction as you remove burrs in order to avoid burrs drop in the tubing.

Putting nut on

• A. Flare nut
• B. Copper tube

Remove flare nuts attached to indoor and outdoor unit, then put them on pipe/tube having completed burr removal. (not possible to put them on after flaring work)
Use the flare nut included with this indoor unit.

Flaring work

• A. Flaring tool
• B. Die
• C. Copper tube
• D. Flare nut
• E. Yoke

Carry out flaring work using flaring tool.

Pipe diameter

(mm)

| Dimension
---|---
A (mm)|

B +0 (mm)

-0.4

When the tool for R32/R410A is used
Clutch type
9.52| 0 – 0.5| 13.2
15.88| 0 – 0.5| 19.7

Firmly hold copper tube in a die in the dimension shown in the table at above.
When reconnecting the detached refrigerant pipes, make sure to flare them again.

Check

• A. Smooth all around
• B. Inside is shining without any scratches
• C. Even length all around
• D. Too much
• E. Tilted
• F. Scratch on flared plane
• G. Cracked
• H. Uneven
• I. Bad examples

Compare the flared work with a figure in right side hand.
If flare is noted to be defective, cut off the flared section and do flaring work again.

Pipe connection

• Apply a thin coat of refrigeration oil on the seat surface of pipe.
• For connection first align the center, then tighten the first 3 to 4 turns of flare nut.
• Use tightening torque table below as a guideline for indoor unit side union joint section, and tighten using two wrenches. Excessive tightening damages the flare section.

Copper pipe O.D.

(mm)

| Flare nut O.D.

(mm)

| Tightening torque

(N·m)

---|---|---
ø9.52| 22| 34 – 42
ø15.88| 29| 68 – 82

Refrigerant piping work

Warning:
Be careful of flying flare nut! (Internally pressurized) Remove the flare nut as follows:

1. Loosen the nut until you hear a hissing noise.
2. Do not remove the nut until the gas has been completely released (i.e., hissing noise stops).
3. Check that the gas has been completely released, and then remove the nut.

Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in the same manner applied for indoor unit.

• For tightening use a torque wrench or spanner, and use the same tightening torque applied for indoor unit.

Refrigerant pipe insulation

After connecting refrigerant piping, insulate the joints (flared joints) with thermal insulation tubing. [Fig. 6-3-2]

• A. Pipe cover (small) (accessory)

• B. Caution:
  Pull out the thermal insulation on the refrigerant piping at the site, insert the flare nut to flare the end, and replace the insulation in its original position.
  Take care to ensure that condensation does not form on exposed copper piping.

• C. Liquid end of refrigerant piping

• D. Gas end of refrigerant piping

• E. Site refrigerant piping

• F. Main body

• G. Pipe cover (large) (accessory)

• H. Thermal insulation (field supply)

• I. Pull

• J. Flare nut

• K. Return to original position

• L. Ensure that there is no gap here

• M. Plate on main body

• N. Band (accessory)

• O. Ensure that there is no gap here. Place join upwards.

1. Remove and discard the rubber bung which is inserted in the end of the unit piping.
2. Flare the end of the site refrigerant piping.
3. Pull out the thermal insulation on the site refrigerant piping and replace the insulation in its original position.

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.

Purging procedures leak test

Drain piping work

• A. Insulator
• B. Drain pipe R1
• C. Drain pan
• D. >_ 70 mm
• E. >- 2 × Ⓕ 70 mm
• F. >_ 35 mm
• G. Downward slope 20 mm/m or more
• H. Drain trap
• I. The drain pipe should extend below this level.
• J. Open drain

Duct work

• In connecting duct, insert canvas duct between unit and duct.

• Use incombustible material for duct parts.

• Provide full insulation to inlet duct flange, outlet duct flange and outlet duct to prevent condensation.

• Be sure to apply the air filter near the air inlet grille.

• Before connecting an inlet duct, install the air filter in the inlet grille. [Fig. 7-1-1]

• A. Air inlet

• B. Air outlet

• C. Access door

• D. Ceiling surface

• E. Canvas duct

• F. Keep duct-work length 850 or more

• G. Connect common reference potential wire between duct-work to air conditioner

Warning:
If one or more rooms are connected to the unit using a duct system, make sure:

• Install the unit in a space with at least a minimum floor area defined in the installation manual for the outdoor unit.
• no auxiliary devices, which may be a potential ignition source, are installed in the duct work;
• only auxiliary devices approved by the manufacturer are used in the duct work;
• an air inlet or outlet is connected directly with a room by ducting. Do NOT use spaces such as a false ceiling as a duct for the air inlet or outlet.
• Do NOT install operating ignition sources (example: open flames, an operating gas appliance or an operating electric heater) in the duct work.

Caution:

• Inlet duct of 850 mm or more should be construted.
• To connect the air conditioner main body and the duct for potential equalization.
• To reduce the risk of injury from metal sheet edges, wear protective gloves.
• Install sufficient thermal insulation to prevent condensation forming on outlet duct flanges and outlet ducts.
• To avoid electrical noise interference, do not run transmission lines at the bottom of the unit.
• To prevent damage to the inlet flange, install the duct so that a load of 3 kg or heavier will not be applied to the inlet flange. [Fig. 7-1-2]
• Mount holes for outlet duct flange and inlet duct. [Fig. 7-1-3]
• The return-air-temperature thermistor is located directly behind the control box and senses the temperature of the air passing through the flange closest to the control box. [Fig. 7-1-2]

Electrical work

Power supply

Indoor unit power supplied from outdoor unit

• Ⓐ Outdoor unit power supply
• Ⓑ Earth leakage breaker
• Ⓒ Wiring circuit breaker or isolating switch
• Ⓓ Outdoor unit
• Ⓔ Indoor unit/outdoor unit connecting cables
• Ⓕ Remote controller
• Ⓖ Indoor unit

Field electrical wiring

Wiring Wire No.

´ size (mm2)

| Indoor unit power supply (Heater)| –
Indoor unit power supply (Heater) earth| –
Indoor unit-Outdoor unit| 3 ´ 1.5 (polar)
Indoor unit-Outdoor unit earth| 1 ´ Min. 1.5
Remote controller-Indoor unit| 1| 2 ´ 0.3 (Non-polar)
Circuit rating| Indoor unit (Heater) L-N| 2| –
Indoor unit-Outdoor unit S1-S2| 2| 230 V AC
Indoor unit-Outdoor unit S2-S3| 2| 24 V DC
Remote controller-Indoor unit| *2| 14 V DC

1. The 10 m wire is attached in the remote controller accessory. Max. 500 m
2. The figures are NOT always against the ground. S3 terminal has 24 V DC against S2 terminal. However between S3 and S1, these terminals are not electrically insulated by the transformer or other device.

Notes:

1. Wiring size must comply with the applicable local and national code.
2. Power supply cords and indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC57)
3. Install an earth longer than other cables.
4. Indoor and outdoor connecting wires have polarities. Make sure to match the terminal number (S1, S2, S3) for correct wirings.
5. Wiring for remote controller cable shall be apart (5 cm, 2 inch or more) from power source wiring so that it is not influenced by electric noise from power source wiring.
6. The appliance shall be installed in accordance with national wiring regulations.
7. A breaker with at least 3.0 mm contact board separation in each pole shall be provided.

Indoor wire connection
Please identify the model name of the operation manual attached on the terminal block box with that shown on the rating name plate.

1. Loosen the three screws holding the cover to dismount the cover.

   • Ⓐ Screws
   • Ⓑ Cover

2. Open knockout holes
   (Recommend to use a screwdriver or the like for this work.)[Fig. 8-2-2]

   • Ⓒ knockout hole

3. Fix indoor unit/outdoor unit connecting wire to terminal block box by using buffer bushing for tensile force. (PG connection or the like.) Connect remote controller cable to terminal block through the knockout hole of terminal block box using ordinary bushing. [Fig. 8-2-3]

   • Ⓓ Use PG bushing to keep the weight of the cable and external force from being applied to the power supply terminal connector. Use a cable tie to secure the cable.
   • Ⓔ Remote controller cable
   • Ⓕ Use ordinary bushing
   • Ⓖ Indoor unit/outdoor unit connecting wire
   • Ⓗ Terminal block for indoor unit/outdoor unit connecting wire
   • Ⓘ Terminal block for remote controller cable

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

Warning:

• Attach the electrical part cover securely. If it is attached incorrectly, it could result in a fire, electric shock due to dust, water, etc.

• Use the specified indoor/outdoor unit connecting wire to connect the indoor and outdoor units and fix the wire to the terminal block securely so that no stress is applied to the connecting section of the terminal block. Incomplete connection or fixing of the wire could result in a fire.

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

• When accommodating the terminal block box, make sure that the connectors on the box side are not removed. If removed, it cannot operate normally. [Fig. 8-2-5]

• Ⓐ Indoor terminal block

• Ⓑ Earth wire (green/yellow)

• Ⓒ Indoor/outdoor unit connecting wire 3-core 1.5 mm2 or more

• Ⓓ Outdoor terminal block

• Ⓔ Power supply cord : 2.0 mm2 or more

  1. Connecting cable Cable 3-core 1.5 mm2, in conformity with Design 60245 IEC 57.
  2. Indoor terminal block
  3. Outdoor terminal block
  4. Always install an earth wire (1-core 1.5 mm2) longer than other cables
  5. Remote controller cable Wire No × size (mm2) : Cable 2C × 0.3 This wire accessory of remote controller (wire length : 10 m, non-polar. Max. 500 m)
  6. Wired remote controller (option)
  7. Power supply cord Cable 3-core 2.0 mm2 or more, in conformity with Design 60245 IEC 57.

• Perform wiring as shown in [Fig. 8-2-5]. (Procure the cable locally.)
  Make sure to use cables of the correct polarity only.

• Connect the terminal blocks as shown in [Fig. 8-2-5].

Caution:

• Use care not to make mis-wiring.
• Firmly tighten the terminal screws to prevent them from loosening.
• After tightening, pull the wires lightly to confirm that they do not move.

Remote controller (wireless remote controller (option))

For wireless remote controller (option)

1. Installation area
   • Area in which the remote controller is not exposed to direct sunshine.
   • Area in which there is no near by heating source.
   • Area in which the remote controller is not exposed to cold (or hot) winds.
   • Area in which the remote controller can be operated easily.
   • Area in which the remote controller is beyond the reach of children.
   • The signal can travel up to approximately 7 meters (in a straight line) within 45 degrees to both right and left of the center line of the receiver.
   • Connect the infrared remote controller signal receiver sensor to the circuit board on the A-side.
2. Installing procedures
   Refer to the installation manual that comes with each remote controller for details.

Signal Receiving Unit

1. Sample system connection

• Ⓐ Outdoor unit
• Ⓑ Refrigerant address
• Ⓒ Indoor unit
• Ⓓ Signal receiving unit

Only the wiring from the signal receiving unit and between the remote controllers is shown in [Fig. 8-3-1]. The wiring differs depending on the unit to be connected or the system to be used.
For details on restrictions, refer to the installation manual or the service handbook that came with the unit.

1. Connecting to Mr. SLIM air conditioner

2. Standard 1:1

3. Connecting the signal receiving unit
   Connect the signal receiving unit to the CN90 (Connect to the wireless remote controller board) on the indoor unit using the supplied remote controller wire. Connect the signal receiving units to all the indoor units.

4. Installing procedures
   Refer to the installation manual that comes with each remote controller for details.

Setting

1. Setting the pair number switch [Fig. 8-3-2]

2. Setting method
   Assign the same pair number to the wireless remote controller as that of the indoor unit. If not doing so, the remote controller cannot be operated. Refer to the installation manual that came with the wireless remote controller for how to set pair numbers of wireless remote controllers.
   Position of daisy wire on the controller circuit board on the indoor unit. Controller circuit board on the indoor unit (reference) [Fig. 8-3-2] Ⓐ CN90: Connector for remote controller wire connection
   For pair number settings, the following 4 patterns (A-D) are available.Pair number setting pattern| Pair number on remote controller side| Indoor controller circuit board side Point where the daisy wire is disconnected
   ---|---|---
   A| 0| Not disconnected
   B| 1| J41 disconnected
   C| 2| J42 disconnected
   D| 3~9| J41 and J42 disconnected

3. Setting example

4. To use the units in the same room

5. Separate setting
   Assign a different pair number to each indoor unit to operate each indoor unit by its own wireless remote controller.

6. Single setting
   Assign the same pair number to all the indoor units to operate all the indoor units by a single wireless remote controller.

7. To use the units in different rooms
   Assign the same pair number to the wireless remote controller as that of the indoor unit. (Leave the setting as it is at purchase.)

8. Setting the Model No.

1. Insert batteries.

2. Press the SET button with something sharp at the end.
   MODEL SELECT blinks and Model No. lighted.

3. Press the temp button up down to set the Model No.

4. Press the SET button with something sharp at the end.
   MODEL SELECT and Model No. are lighted for three seconds, then turned off.

Function settings

For wired remote controller

1. [Fig. 8-4-1] Note: Maintenance password is required.
   Press Setting on the Main window, and select “Service” to set the maintenance settings.
   When the Service menu is selected, a window will appear asking for the password. To enter the current maintenance password (4 numerical digits), move the cursor to the digit you want to change with the [F1] or [F2] button, and set each number (0 through 9) with the [F3] or [F4] button. Then, press the [SELECT] button.
   Note:

   • The initial maintenance password is “9999.” Change the default password as necessary to prevent unauthorized access. Have the password available for relevant personnel.
   • If you forget your maintenance password, you can initialize the password to the default password “9999” by pressing and holding the [F1] button for ten seconds on the maintenance password setting screen.
   • Air conditioning units may need to be stopped to make certain settings. There may be some settings that cannot be made when the system is centrally controlled.

2. [Fig. 8-4-2]

   • Select “Service” from the Main menu, and press the [SELECT] button.
   • Select “Function setting” with the [F1] or [F2] button, and press the [SELECT] button.
   • Set the indoor unit refrigerant addresses and unit numbers with the [F1] through [F4] buttons, and then press the [SELECT] button to confirm the current setting. When the [SELECT] button is pressed, the target indoor unit will start fan operation. If the unit is common or when running all units, all indoor units for the selected refrigerant address will start fan operation.

3. [Fig. 8-4-3]

   • When data collection from the indoor units is completed, the current settings appears highlighted. Non-highlighted items indicate that no function settings are made. Screen appearance varies depending on the “Unit No.” setting.

4. [Fig. 8-4-4]

   • Use the [F1] or [F2] button to move the cursor to select the mode number, and change the setting number with the [F3] or [F4] button.

5. [Fig. 8-4-5]

   • When the settings are completed, press the [SELECT] button to send the setting data from the remote controller to the indoor units.
   • When the transmission is successfully completed, the screen will return to the Function setting screen.

For wireless remote controller [Fig. 8-4-6]

1. Changing the external static pressure setting.
   Be sure to change the external static pressure setting depending on the duct and the grill used.

2. Go to the function select mode
   Press the CHECK button Ⓕ twice continuously.
   (Start this operation from the status of remote controller display turned off.) CHECK is lighted and “00” blinks.
   Press the TEMP button Ⓒ once to set “50”. Direct the wireless remote controller toward the receiver of the indoor unit and press the Hour button Ⓐ.

3. Setting the unit number
   Press the TEMP button Ⓒ and Ⓓ to set the unit number to 07. Direct the wireless remote controller toward the receiver of the indoor unit and press the Minute button Ⓑ.

4. Selecting a mode
   Enter 08 to change the external static pressure setting using the Ⓒ and Ⓓ buttons.
   Direct the wireless remote controller toward the receiver of the indoor unit and press the Hour button Ⓐ.
   Current setting number:

  * 1 = 1 beep (one second)
  * 2 = 2 beeps (one second each)
  * 3 = 3 beeps (one second each)
4. Selecting the setting number  

Use the Ⓒ and Ⓓ buttons to change the external static pressure setting to be used.
Direct the wireless remote controller toward the sensor of the indoor unit and press the Hour button Ⓐ.

5. To set the external static pressure  

Repeat steps ③ and ④ to set the mode number to 10.

6. Complete function selection  

Direct the wireless remote controller toward the sensor of the indoor unit and press the ON/OFF button Ⓔ.

Note:
Whenever changes are made to the function settings after installation or maintenance, be sure to record the changes with a mark in the “Check” column of the Function table.

Changing the power voltage setting (Function table 1)

Be sure to change the power voltage setting depending on the voltage used.

Function table 1
Select unit number 00

Power failure automatic recovery*1

(AUTO RESTART FUNCTION)

| Not available| 01| 1|  (*1)|
Available| 2| |
Indoor temperature detecting| Indoor unit operating average|

02

| 1| |
Set by indoor unit’s remote controller| 2| |
Remote controller’s internal sensor| 3| |
LOSSNAY connectivity| Not Supported|

03

| 1| |
Supported (indoor unit is not equipped with outdoor-air intake)| 2| |
Supported (indoor unit is equipped with outdoor-air intake)| 3| |
Power voltage| 240V| 04| 1| |
220V, 230V| 2| |
Auto mode| Energy saving cycle automatically enabled| 05| 1| |
Energy saving cycle automatically disabled| 2| |

Function table 2
Select unit number AL [wired remote controller]/07 [wireless remote controller]

07

| 1| |
2500 Hr| 2| |
No filter sign indicator| 3| |
External static pressure| |

08

| 1| |
2| |
3| |

10

| 1| |
2| |
3| |

*1 When the power supply returns, the air conditioner will start 3 minutes later.
Note: When the function of an indoor unit were changed by function selection after the end of installation, always indicate the contents by entering a or other mark in the appropriate check filed of the tables.

Test run

Before test run

• After completing installation and the wiring and piping of the indoor and outdoor units, check for refrigerant leakage, looseness in the power supply or control wiring, wrong polarity, and no disconnection of one phase in the supply.
• Use a 500-volt megohmmeter to check that the resistance between the power supply terminals and ground is at least 1.0 MΩΩ.
• Do not carry out this test on the control wiring (low voltage circuit) terminals.

Warning:
Do not use the air conditioner if the insulation resistance is less than 1.0 MΩΩ. Insulation resistance
After installation or after the power source to the unit has been cut for an extended period, the insulation resistance will drop below 1 MΩ due to refrigerant accumulating in the compressor. This is not a malfunction. Perform the following procedures.

1. Remove the wires from the compressor and measure the insulation resistance of the compressor.
2. If the insulation resistance is below 1 MΩ, the compressor is faulty or the resistance dropped due the accumulation of refrigerant in the compressor.
3. After connecting the wires to the compressor, the compressor will start to warm up after power is supplied. After supplying power for the times indicated below, measure the insulation resistance again.
   • The insulation resistance drops due to accumulation of refrigerant in the compressor. The resistance will rise above 1 MΩ after the compressor is warmed up for two to three hours. (The time necessary to warm up the compressor varies according to atmospheric conditions and refrigerant accumulation.)
   • To operate the compressor with refrigerant accumulated in the compressor, the compressor must be warmed up at least 12 hours to prevent breakdown.
4. If the insulation resistance rises above 1 MΩ, the compressor is not faulty.

Caution:

• The compressor will not operate unless the power supply phase connection is correct.
• Turn on the power at least 12 hours before starting operation.
  • Starting operation immediately after turning on the main power switch can result in severe damage to internal parts. Keep the power switch turned on during the operational season.

Test run

Using wired remote controller (option)

• Make sure to read operation manual before test run. (Especially items to secure safety)

Step 1 Turn on the power.

• Remote controller: The system will go into startup mode, and the remote controller power lamp (green) and “PLEASE WAIT” will blink. While the lamp and message are blinking, the remote controller cannot be operated. Wait until “PLEASE WAIT” is not displayed before operating the remote controller. After the power is turned on, “PLEASE WAIT” will be displayed for approximately 2 minutes.
• Indoor controller board: LED 1 will be lit up, LED 2 will be lit up (if the address is 0) or off (if the address is not 0), and LED 3 will blink.
• Outdoor controller board: LED 1 (green) and LED 2 (red) will be lit up. (After the startup mode of the system finishes, LED 2 will be turned off.) If the outdoor controller board uses a digital display, [- ] and [ -] will be displayed alternately every second.
  If the operations do not function correctly after the procedures in step 2 and thereafter are performed, the following causes should be considered and eliminated if they are found.
  (The symptoms below occur during the test run mode. “Startup” in the table means the LED display written above.)

Symptoms in test run mode| ****

Cause

---|---
Remote Controller Display| OUTDOOR BOARD LED Display

Remote controller displays “PLEASE WAIT”, and cannot be operated.| After “startup” is displayed, only green lights up.

| •  After power is turned on, “PLEASE WAIT” is displayed for 2

minutes during system startup. (Normal)

After power is turned on, “PLEASE WAIT” is displayed for 3 minutes, then error code is displayed.

| After “startup” is displayed, green (once) and red (once) blink alternately.