MITSUBISHI ELECTRIC NTXUKS09A112B Ceiling Cassette Type Air Conditioners User Manual

MITSUBISHI ELECTRIC NTXUKS09A112B Ceiling Cassette Type Air Conditioners

Product Information

Specifications

• Model Numbers: NTXUKS09A112B, NTXUKS12A112B, NTXUKS18A112B
• Type : Ceiling Cassette Type Air Conditioners
• Manufacturer: MITSUBISHI ELECTRIC TRANE HVAC US

Product Usage Instructions

Before Installation

Before starting the installation process, ensure the following safety precautions are observed:

• Do not attempt to install the unit by yourself. Always seek assistance from a qualified installer.
• Use only the provided or specified parts during installation to prevent any potential hazards.
• Refer to the installation manual for secure installation procedures.

Indoor Unit Installation

Follow the steps outlined in the installation manual for proper indoor unit installation. Securely connect the refrigerant pipes before starting the compressor to avoid any risks of pipe burst or injury.

Flaring Work and Pipe Connection

Use appropriate tools such as a flare tool for R410A and a pipe cutter with reamer to ensure proper flaring work and pipe connection.

Test Run

After installation, perform a test run of the unit to ensure it is functioning correctly and efficiently.

Grille (Option) Installation

If applicable, follow the instructions in the manual for installing the grille option to enhance the aesthetics of the unit.

(FAQ)

• Q : Can I install the air conditioner by myself?
• A: It is recommended to seek assistance from a qualified installer to ensure safe and proper installation.
• Q : What tools are required for installation?
• A: The required tools include a Phillips screwdriver, level, hole saw, torque wrench, gauge manifold, vacuum pump, charge hose, pipe cutter, and water bottle among others.

Required Tools for Installation

• Phillips screwdriver
• Level
• Scale
• Utility knife or scissors
• 2-15/16 in. (75 mm) hole saw Torque wrench
• Wrench (or spanner)
• Flare tool for R410A
• Gauge manifold for R410A
• Vacuum pump for R410A
• Charge hose for R410A
• Pipe cutter with reamer
• Water bottle 0.9 to 1.0 L water

BEFORE INSTALLATION

THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY

• Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing the air conditioner.
• Be sure to observe the warnings and cautions specified here as they include important items related to safety.
• After reading this manual, be sure to keep it together with the OPERATING INSTRUCTIONS for future reference.
• Please report to your supply authority or obtain their consent before connecting this equipment to the power supply system.

WARNING

(Could lead to death, serious injury, etc.)

• Do not install the unit by yourself (user). Incomplete installation could cause fire or electric shock, injury due to the unit falling, or leakage of water. Consult the dealer from whom you purchased the unit or a qualified installer.
• Perform the installation securely referring to the installation manual. Incomplete installation could cause fire or electric shock, injury due to the unit falling, or leakage of water.
• When installing the unit, use appropriate protective equipment and tools for safety. Failure to do so could cause injury.
• Install the unit securely in a place that can bear the weight of the unit. If the installation location cannot bear the weight of the unit, the unit could fall causing injury.
• Electrical work should be performed by a qualified, experienced electrician, according to the installation manual. Be sure to use an exclusive circuit. Do not connect other electri-cal appliances to the 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.
• Ground the unit correctly. Do not connect the ground to a gas pipe, water pipe, lightning rod or telephone ground. Defective ground-ing could cause electric shock.
• Do not damage the wires by applying exces-sive pressure with parts or screws. Damaged wires could cause fire or electric shock.
• Be sure to cut off the main power in case of setting up the indoor P.C. board or wiring works. Failure to do so could cause electric shock.
• Use the specified wires to connect the indoor and outdoor units securely and attach the wires firmly to the terminal block connecting sections so the stress of the wires is not applied to the sections. Do not extend the wires, or use the intermediate connection. Incomplete connecting and securing could cause a fire.
• Do not install the unit in a place where flammable gas may leak. If gas leaks and accumulates in the area around the unit, it could cause an explosion.
• 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 de-fective contact, defective insulation, exceeding the permissible current, etc.
• Be sure to use the parts 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.
• When plugging the power supply plug into the outlet, make sure that there is no dust, clog-ging, or loose parts in both the outlet and the plug. Make sure that the power supply plug is pushed completely into the outlet. If there is dust, clogging, or loose parts on the power supply plug or the outlet, it could cause electric shock or fire. If loose parts are found on the power supply plug, replace it.
• Attach the electrical cover to the indoor unit and the service panel to the outdoor unit securely. If the electrical cover of the indoor unit and/or the service panel of the outdoor unit are not attached securely, it could result in a fire or an electric shock due to dust, water, etc.
• When installing, relocating, or servicing the unit, make sure that no substance other than the specified refrigerant (R410A) enters the refrigerant circuit. Any presence of foreign substances such as air can cause abnormal pressure rise and may result in an explosion or injury. 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.
• Do not discharge the refrigerant into the atmosphere. Check that the refrigerant gas does not leak after the installation has been completed. If refrigerant leaks during installation, ventilate the room. If refrigerant comes in contact with a fire, harmful gas could be generated. If refrigerant gas leaks indoors, and comes into contact with the flame of a fan heater, space heater, stove, etc., harmful gases will be generated.
• Use appropriate tools and piping materials for installation. The pressure of R410A is 1.6 times more than R22. Not using appropriate tools or materials and incomplete installation could cause the pipes to burst or injury.
• When the refrigeration circuit has a leak, do not execute the pump down with the compressor. When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.If the refrigerant pipes are disconnected while the compressor is running and the stop valve is open, air could be drawn in and the pressure in the refrigeration cycle could become abnormally high. This could cause the pipes to burst or injury.
• When installing the unit, securely connect the refrigerant pipes before starting the compressor. If the compressor is started before the refrigerant pipes are connected and when the stop valve is open, air could be drawn in and the pressure in the refrigeration cycle could become abnormally high. This could cause the pipes to burst or injury.
• Fasten a flare nut with a torque wrench as specified in this manual. If fastened too tight, a flare nut may break after a long period and cause refrigerant leakage.
• The unit shall be installed in accordance with national wiring regulations.
• Do not use means to accelerate the defrosting process or to clean, other than those recom-mended by the manufacturer.
• The appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance or an operating electric heater).
• Do not pierce or burn.
• Be aware that refrigerants may not contain an odour.
• Pipework shall be protected from physical damage.
• The installation of pipe work shall be kept to a minimum.
• Keep any required ventilation openings clear of obstruction.
• Keep gas-burning appliances, electric heaters, and other fire sources (ignition sources) away from the location where installation, repair, and other air conditioner work will be performed.
• Exercise caution when using any auxiliary heat source and follow all third-party manufacturer instructions and safety guidelines for installa-tion and usage. Any auxiliary heat source connected to this unit via the CN24 connection must have an independent temperature control mechanism. Failure to install and maintain such a temperature control mechanism may void the warranty for this unit. Mitsubishi Electric shall not bear any warranty obligation or other liability for any damage or loss in connection with such third-party auxiliary heaters.

CAUTION (Could lead to serious injury in particular environments when operated incorrectly.)

• Depending on the installation area, install a Ground Fault Interrupt (GFI) circuit breaker. If the Ground Fault Interrupt (GFI) circuit breaker is not installed, an electric shock could occur.
• Perform the drainage/piping work securely according to the installation manual. If there is a defect in the drainage/piping work, water could drip from the unit, and damage household items.
• Do not touch the air inlet or the aluminium fins of the outdoor unit. This could cause injury.
• Do not install the outdoor unit where small animals may live.
• If small animals enter the unit and damage its electri-cal parts, it could cause a malfunction, smoke emissions, or fire. Keep the area around the unit clean.

SELECTING THE INSTALLATION LOCATION

INDOOR UNIT

• Where airflow is not blocked.
•  Where cool (or warm) air spreads over the entire room.
• Where it is not exposed to direct sunshine. Do not be exposed to direct sunshine also during the period following unpacking to before use.
• Where easily drained.
• At a distance 3 ft. (1 m) or more away from your TV and radio. Operation of the air conditioner may interfere with radio or TV reception. An amplifier may be required for the affected device.
• In a place as far away as possible from fluorescent and incandescent lights. In order to make the infrared remote control operate the air conditioner normally. The heat from the lights may cause deformation or the ultraviolet may cause deterioration.
• Where the air filter can be removed and replaced easily.
• Where it is away from the other heat or steam source.

REMOTE CONTROLLER

• Where it is easy to operate and easily visible.
• Where children cannot touch it.
• Select a position about 4 ft. (1.2 m) above the floor and check that signals from the remote controller are surely received by the indoor unit from that position (‘beep’ or ‘beep beep’ receiving tone sounds). After that, attach remote controller holder to a pillar or wall and install a wireless remote controller.

Note:
In rooms where inverter-type fluorescent lamps are used, the signal from the wireless remote controller may not be received.

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

• Where flammable gas could leak.
• Where there is much machine oil.
• Where oil is splashed or where the area is filled with oily smoke (such as cooking areas and factories, in which the properties of plastic could be changed and damaged).
• Salty places such as the seaside.
• Where sulphide gas is generated such as hot springs, sewage, and wastewater.
• Where there is high-frequency or wireless equipment.
• Where there is emission of high levels of VOCs, including phthalate compounds, formaldehyde, etc., which may cause chemical cracking.
• The appliance shall be stored so as to prevent mechanical damage from occurring.

SPECIFICATIONS
INDOOR/OUTDOOR WIRE CONNECTION

• Wiring work should be based on applicable technical standards.
• Wiring connections should be made following the diagram.
• Securely tighten screws.

Connecting wires and the ground wire

• Use solid conductor Min. AWG14 or stranded conductor Min. AWG14.
• Use double-insulated copper wire with 600 V insulation.
• Use copper conductors only.
• Follow local electrical codes.

Note:
When the indoor unit is powered from the outdoor unit, depending on the local code, a disconnect switch needs to be installed to a power supply circuit.

REFRIGERANT PIPES

• To prevent condensation, insulate the two refrigerant pipes.

Note:
Be sure to use the insulation of a specified thickness (table on the right). Excessive insulation may cause incorrect installation of the indoor unit, and too little insulation may cause condensate to form.

• The unit has flared connections on both indoor and outdoor sides.
• Remove the valve cover from the outdoor unit, then connect the pipe.
• Refrigerant pipes are used to connect the indoor and outdoor units.
• Be careful not to crush or overbend the pipe in pipe bending.

Electrical specifications

INDOOR UNIT

Power supply (V, PHASE, Hz)| 208/230, 1, 60
Min. Circuit Ampacity         (A)| 1.0
Fan motor (F.L.A.)            (A)| 0.68

Pipe

| Outside

diameter

| Minimum wall thick- ness| Insulation

thickness

| ****

Insulation

material

---|---|---|---|---
inch (mm)
For liquid| NTXUKS09/12/18A112B✱| 1/4 (6.35)| 0.0315

(0.8)

| 5/16 (8)| Heat-resistant foam plastic 0.045 Specific gravity

For gas

| NTXUKS09/12A112B✱| 3/8 (9.52)| 0.0315

(0.8)

| 5/16 (8)
NTXUKS18A112B✱| 1/2 (12.7)| 0.0315

(0.8)

| 5/16 (8)

INSTALLATION DIAGRAM

Units should be installed by licensed contractors according to local code requirements.

IMPORTANT NOTES
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. The check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans

Service space

• The dimensions of the ceiling opening can be regulated within the range shown in the following diagram; so centre the main unit against the opening of the ceiling, ensuring that the respective opposite sides on all sides of the clearance between them becomes identical

ACCESSORIES
Check the following parts before installation

| Alkaline battery (AAA) for| 2
---|---|---
| Drain hose (with insulation)| 1
| Special washer (with cushion, 4 pcs)| 8
| Installation template| 1
| Fixing screw for  M5 × 30 mm| 4
| Band| 1
| Fixing screw for  4 × 16 mm| 2
| Remote controller| 1
| Remote controller holder| 1
| Fixing screw for  3.5 × 16 mm (Black)| 2

PARTS TO BE PROVIDED AT YOUR SITE

H

| Insulating material for A

(Heat resistant foamed polyethylene,

specific gravity 0.045, thickness more than 9/16 in. (14 mm))

| ****

1

J

| Insulating material for B

(Foamed polyethylene, specific gravity

0.03, thickness more than 3/8 in. (10 mm))

| ****

1

Note:

Place indoor/outdoor unit connecting wire   D at least 3 ft. (1 m) away from the TV  antenna wire

INDOOR UNIT INSTALLATION

CEILING OPENINGS AND SUSPENSION BOLT INSTALLATION LOCATIONS

• Install the indoor unit at least 7 ft. (2.2 m) above the floor or grade level. For appliances not accessible to the general public.
• The refrigerant pipes connection shall be accessible for maintenance purposes.
• Make an opening in the ceiling 15-1/8 × 45-11/16 in. (384 mm × 1160 mm) in size. This functions as a check window and will be needed later during servicing.
• If the dimensions are not accurate, when the grille is installed there may be gaps between it and the indoor unit. This may result in dripping water or other problems.
• When deciding on placement, consider carefully the space around the ceiling and make your measurements generous.
• Ceiling types and building construction differ. Therefore you should consult with the builder and decorator.
• Using the installation template 4 (top of the package) and the gauge (supplied as an accessory with the grille), make an opening in the ceiling so that the main unit can be installed as shown in the diagram. (The method for using the template and the gauge are shown.)
• Use W3/8 suspension bolts E.
• After suspending the indoor unit, you will have to connect the pipes and wiring above the ceiling. Once the location has been fixed and the direction of the pipes has been determined, place the refrigerant and drainage pipes, and the wiring that connects the indoor and outdoor units in their desired locations before suspending the indoor unit. This is especially important in cases where the ceiling is already in existence.
• The packing material (cushion) is taped to the unit. When using the packing material, do not remove it from the unit to prevent horizontal vane damage.
• 
• Remove the packing material (cushion) before installing the plastic bag and the cover.
• To prevent dust, protect the indoor unit by covering it with a plastic bag and the cover.
• Remove the plastic bag and the cover before installing the grille (optional).
• When the distance between joints is 15-1/8 in. (348 mm) or less, please refer to the notice affixed to the packing material.

Wooden structures

1. 1. Use tie beams (single-storied houses) or second-floor beams (two-story houses) as reinforcing members.

2. Wooden beams for suspending air conditioners must be sturdy and their sides must be at least 2-3/8 in. (60 mm) long if the beams are separated by not more than 35-7/16 in. (900 mm) and their sides must be at least 3-9/16 in. (90 mm) long if the beams are separated by as much as 6 ft.(1800 mm).
3. Use channel, duct and other parts procured locally to suspend the indoor unit.

Ferro-concrete structures

• Secure the suspension bolts using the method shown, or use steel or wooden hangers, etc. to install the suspension bolts E.
• When the unit is put down with its lower surface facing down, place packing material (cushion) underneath to prevent horizontal vane damage.

Unit suspension procedures

• Adjust the length of the bolt’s protrusion from the ceiling surface beforehand. Check the pitch of the suspension bolt E. (12-1/8 × 41-3/8 in. (308 mm × 1051 mm))

1. Install the special washer and their nuts F onto the suspension bolt E in advance.
2. Do this in the following order (from the top): nut F, special washer with cushion, special washer, nut F, nut G.
3. Position a special washer, with a cushion with the insulated surface pointing down, as in the figure.
4. Lift the unit into place, and align it properly with suspension bolt E. Pass the bracket between the special washer, with cushion and special washer, which are already in place, and secure it. Do the same in all four places.
5. Make sure the suspension bolt E extends 2-3/4 in. (70 mm) or more from the surface of the ceiling. Otherwise, you will not be able to install the grille (optional).
6. If the points for securing the grille are not flush with the ceiling surface, water may condense, or the panel may not open/close.
7. If the long opening in the bracket and the opening in the ceiling do not align, adjust them until they do.
8. Check that the four places for securing the grille are all level using a spirit level.
9. Tighten all the nuts.

HOLE DRILLING

1. Determine the wall hole position.
2. Drill a dia. 2-15/16 in. (75 mm) hole. The outdoor side should be 3/16 to 1/4 in. (5 to 7 mm) lower than the indoor side.
3. Insert wall hole sleeve K.

DRAIN PIPING

• Use drain pipe B for drain piping. Be sure to connect the piping joints using adhesive of the polyvinyl chloride family to prevent leakage.

• Before drain piping work, remove the pipe cover, hose band, pipe band, and spacer (cushion). Dispose of the spacer (cushion), as it will not be needed.

• The drain hose is 21-5/8 in. (550 mm) long so that drain piping exit can be moved up. Cut the drain hose into the appropriate length before connecting.

• Connect drain pipe B directly to the drain piping connecting part (socket side) of the drain hose.

• Be sure to connect the drain hose 2 to  the indoor unit side as shown in the illustration on the right. Be sure to connect the drain hose connecting part using adhesive of polyvinyl chloride family to prevent leakage.

• To bring up the drain exit, first arrange the drain hose 2 to go upward vertically, and then provide a 1/100 or more downward slope, as shown in the illustration below.

• If the drain piping passes indoors, be sure to apply insulating material J (Foamed polyethylene, specific gravity 0.03, thickness more than 3/8 in. (10 mm)). Connect drain hose connecting part using adhesive of polyvinyl chloride family before installing the hose band

• Apply insulating material J until the drain piping connecting part, as shown in the upper right illustration. Drain piping should form a downward slope (1/100 or more) to the outdoor drain exit. Do not form a trap or raise the pipe.

• Do not arrange the pipe horizontally for more than 65 ft. (20 m). When the drain piping is too long, use support metal to prevent the drain pipe from forming an up or down curve. Be sure not to install an air bleeder. (Since the drain lift-up mechanism is built-in, a drain may blow out.)

• An odor trap for drain outlet is not necessary.

• For grouped piping, arrange piping so that the grouped piping is about 3-15/16 in. (100 mm) lower than the unit drain exit, as shown in the figure. Use about a drain pipe (O.D. 1-1/2 in. (38 mm)) for grouped piping, and arrange it so that it forms about 1/100 or more downward slope.

• Do not place drain piping directly into a place where ammonia gas or sulfuric gas is formed, such as sewage tanks or septic tanks.

CONNECTING WIRES FOR INDOOR UNIT

Note: The unit should be installed by a licensed contractor/electrician. If required by applicable national, state and local codes; a disconnect switch will need to be installedwhen the indoor unit is powered from the outdoor unit.

1. Remove the electrical cover (1).
2. Remove the conduit plate.
3. Attach the conduit pipe to the conduit plate with the lock nut. The indoor/outdoor unit connecting wire D appearing from the inside of the conduit pipe should be less than 7/8 in. (23 mm). (Fig. 1)
4. Process the end of the ground wire (Fig. 2). Connect it to the ground terminal of the electrical parts box.
5. Process the end of the indoor/outdoor unit connecting wire D (Fig. 2). Attach it to the terminal block. Be careful not to make miswiring. Attach the wire to the terminal block securely so that its core cannot be seen, and no external force affects the connecting section of the terminal block.
6. Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fastened.
7. Reinstall the conduit plate.
8. Pass the indoor/outdoor unit connecting wire D and process the end of the wire.
9. Loosen the terminal screw, and connect first the ground wire, then the indoor/outdoor unit connecting wire D to the terminal block. Be careful not to make miswiring. Fix the wire to the terminal block securely so that no part of its core is appeared, and no external force is conveyed to the connecting section of the terminal block.
10. Firmly tighten the terminal screws to prevent them from loosening. After tightening, pull the wires lightly to confirm that they do not move.
11. Reinstall the electrical cover (1).

When the ceiling is above 8 ft. (2.4 m) and 9 ft. (2.7 m) or below Move the slide switch (SW3) to the right to increase airflow volume.

• When the ceiling is above 9 ft. (2.7 m), airflow volume may be insufficient even with the slide switch (SW3) set to “increase airflow”.

1. Make sure that the breaker for the air conditioner is turned OFF.
2. Remove electrical covers (1) and (2) of the indoor unit.
3. Slide out the electronic control P.C. board, and switch up the slide switch (SW).
4. Put the electronic control P.C. board back to the original position, and install electrical covers (1) and (2).

Note:

• Perform static elimination before setting.
• The default setting is Normal.

For future servicing, give extra length to the connecting wires.

FLARING WORK AND PIPE CONNECTION

PIPING WORK

1. Remove the pipe cover, hose band, pipe band, and spacer (cushion) of the indoor unit. Dispose of the spacer (cushion), as it will not be needed.
2. When using pipe with super insulating material (about ø1-7/8 in. (ø48 mm) liquid pipe, ø2 in. (ø51 mm) gas pipe) for indoor connecting pipe, remove plate and turn it over so that the concave part faces upward.

FLARING WORK

1. Cut the copper pipe correctly with a pipe cutter. (Fig. 1, 2)
2. Completely remove all burrs from the cut cross-section of the pipe. (Fig. 3)
3. Put the end of the copper pipe in a downward direction as you remove burrs to avoid letting burrs drop in the piping.
4. Remove flare nuts attached to indoor and outdoor units, then put them on the pipe having completed burr removal. (Not possible to put them on after flaring work.)
5. Flaring work (Fig. 4, 5). Firmly hold the copper pipe in the dimension shown in the table. Select An inch (mm) from the table according to the tool you use.
6. Check
7. Compare the flared work with Fig. 6.
8. If the flare is noted to be defective, cut off the flared section and do flaring work again.

Pipe diameter inch (mm)| ****

B inch

(mm)

| An inch (mm)| Tightening torque
---|---|---|---
Clutch type tool for R410A| Clutch type tool for R22| Wing nut type tool for R22| ft-lb

(kgf•cm)

| ****

N•m

ø1/4

(6.35)

| 21/32 (17)| ****

0 to 0.02

(0 to 0.5)

| ****

0.04 to 0.06

(1.0 to 1.5)

| 0.06 to 0.08

(1.5 to 2.0)

| 10 to 13

(140 to 180)

| 13.7 to 17.7
ø3/8

(9.52)

| 7/8

(22)

| 25 to 30

(350 to 420)

| 34.4 to 41.2
ø1/2 (12.7)| 1-1/32 (26)| 0.08 to 0.10

(2.0 to 2.5)

| 36 to 42

(500 to 580)

| 49.1 to 56.9
ø5/8

(15.88)

| 1-5/32 (29)| 54 to 58

(750 to 800)

| 73.5 to 78.5

PIPE CONNECTION

• In case of reconnecting the refrigerant pipes after detaching, make the flared part of the pipe re-fabricated.
• Fasten the flare nut with a torque wrench as specified in the table.
• When fastened too tight, the flare nut may brake after a long period and cause refrigerant leakage.
• Be sure to wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite.

Indoor unit connection
Connect both liquid and gas pipings to the indoor unit.

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

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

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

INSTALLING THE PIPE COVER
Make sure to install the pipe cover. Incorrect installation results in water leakage.

No insulation is needed on the pipe connecting part of the indoor side for this unit. The pipe cover gathers the water condensed around the pipe connecting part.

1. Install the pipe band removed in 3-1. to secure the connecting pipes. The pipe band should hold down the insulating material of the connecting pipe. Insulating material should protrude 3/8 in. (10 mm) or more than the pipe band, as shown in the illustration on the right.
2. Install pipe cover

When using pipe with super-insulating material

(about ø1-7/8 in. (ø48 mm) liquid pipe, ø2 in. (ø51 mm) gas pipe)

1. Make sure that the plate is turned over, and the concave part is facing upward. (Refer to 3-1.)
2. Use the band provided with the unit. (Do not use the pipe band attached to the unit)
3. Connecting the pipe exit of pipe cover is precut. Cut it along the line.
4. Install pipe cover

Note:
Install pipe cover and pipe band securely. Incomplete installation will cause water to drip from the unit, soaking and damaging household goods

TEST RUN

• Do not operate the unit for long periods at places such as buildings under construction. This may cause dust or odour to adhere to the unit.
• Perform a test run with the attendance of the user, as much as possible.

1. Press the E.O. SW once for COOL, and twice for HEAT operation. The test run will be performed for 30 minutes. If the left lamp of the operation indicator blinks every 0.5 seconds, inspect the indoor/outdoor unit connecting wire D for mis-wiring. After the test run, emergency mode (set temperature 75°F (24°C)) will start.
2.  To stop operation, press the E.O. SW several times until all LED lamps turn off. Refer to operating instructions for details.

Checking the remote (infrared) signal reception
Press the OFF/ON button on the remote controller and check that an elec-tronic sound is heard from the indoor unit. Press the OFF/ON button again to turn the air conditioner off.

• Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner.

Water drainage check

1. Fill the drain pan with about 0.9–1.0 litres of water. (Don’t pour water directly into the drain pump.)
2. Make a test run of the unit (in Cooling mode).
3. Check for water drainage at the outlet of the drainage pipe.
4. Stop the test run. (Don’t forget to turn off the power.)

Note:

• After test run or remote signal reception check, turn off the unit with the E.O. SW or the remote controller before turning off the power supply. Not doing so will cause the unit to start operation automatically when power supply is resumed.

To the user

• After installing the unit, make sure to explain the user about auto restart function.
•  If auto restart function is unnecessary, it can be deactivated. Con-sult the service representative to deactivate the function. Refer to the service manual for details.

WATER DRAINAGE CHECK FOR INDOOR UNIT

If the wiring work has not been completed, connect terminals S1 and S2 on the indoor terminal block to a 208/230 V single-phase power supply.

Start the drain pump test run.

• Press the emergency operation switch for 5 seconds (until a beep is heard) to start the operation of only the drain pump.
• The two operation monitor lamps start blinking.

Stop the drain pump test run.

• Press the emergency operation switch again to stop the operation of the drain pump. Even if you do not stop the drain pump, it will stop automatically after 15 minutes.
• The operation monitor lamps turn off.

AUTO RESTART FUNCTION
This product is equipped with an auto restart function. When the power supply is stopped during operation, such as during blackouts, the function automati- cally starts operation in the previous setting once the power supply is resumed. (Refer to the operating instructions for details.)
EXPLANATION TO THE USER

• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (how to use the remote controller, how to remove the air filters, how to remove or put the remote controller in the remote controller holder, how to clean, precautions for operation, etc.)
• Recommend the user to read the OPERATING INSTRUCTIONS carefully.

GRILLE (OPTION) INSTALLATION

Refer to the procedures indicated in the installation manual of the Grille (option).

PUMPING DOWN

Refer to the procedures indicated in the installation manual of the outdoor unit.

WARNING

When the refrigeration circuit has a leak, do not execute pump down with the compressor. When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst if air etc. get into it.

CONNECTING AN INTERFACE (OPTION) TO THE AIR CONDITIONER

If you attach this optional part to the model, fold (A) a few times and cut it. Cove the cut part with protective tape Q.

• Connect an interface to the indoor control board of an air conditioner with a connecting cable.
• Cutting or extending the connecting cable of the interface results in defects in connecting. Do not bundle the connecting cable together with the power supply cord, indoor/outdoor connecting wire, and/or ground wire. Keep as much distance as possible between the connecting cable and those wires.
• The thin part of the connecting cable should be stored and placed where customers cannot touch it.

1. Fix the cable tie to the connecting cable at 3-15/16 in. (100 mm) from the edge of the insulation coating part. Attach the mounting cord clamp (medium) to the interface side of the cable tie.
2. Remove the grille. (If the grille has been already installed)
3. Remove the electrical cover (1), (2). Refer to 2-4. CONNECTING WIRES FOR INDOOR UNIT.
4. Slide out the indoor control board, and connect the connecting cable to CN105 and/or CN24 on the indoor control board.
5. Remove the screw shown in the photo blow. Route the connecting cable according to the photo below. Fix the mounting cord clamp (medium), which has attached to the connecting cable, with the screw.
6. Seal the gap between the optional part and the electrical box with tape, etc.
7. Reinstall the indoor control board and the electrical cover (1), (2).
8. Reinstall the grille.

WARNING

Fix the connecting cable at the prescribed position securely. Incorrect installation may cause electric shock, fire, and/ or malfunction.

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