MITSUBISHI ELECTRIC MFZ-KJ09NA Floor Type Air Conditioners Instruction Manual

Note:

The Drain hose is connected to the unit.

FIELD-SUPPLIED PARTS

(J)

| Drain hose

(or soft PVC hose, 19/32 in. (15 mm) in- ner diameter or hard PVC pipe VP16)

| ****

1

(K)| Power supply cord *2| 1

Obstacles above
It’s possible to install an obstacle to the following  area.

Note:
2 Place indoor/outdoor unit connecting wire (A) and power supply cord (K) at least 3 ft. (1 m) away from the TV antenna wire.

Note:

• The dimensions indicated in the arrows ( ) above show the required space to guarantee performance of the air conditioner. Install the outdoor unit where the maximum possible space can be provided, considering later relocation, services, or repairs.
• The cooling/heating performance and the efficiency of power usage may fall about 10% at the place where short cycle is likely occur due to poor ventilation. Installing the air outlet guide (optional) can improve performances.
• If air from the outlet blows against the wall, it may cause stains on the wall.

Drain piping for outdoor unit
Install the unit horizontally.
Do not use drain socket in cold regions. Drain may freeze and make the fan stop.
The outdoor unit produces condensate during the heating operation. Select the installation place to ensure to prevent the outdoor unit and/or the grounds from being wet by drain water or damaged by frozen drain water.

INDOOR UNIT INSTALLATION

FIXING OF INDOOR UNIT MOUNTING BRACKET

• Find a structural material (such as a stud) in the wall and fix bracket (7) horizontally with fixing screws (8).
• To prevent bracket (7) from vibrating, be sure to install the fixing screws in the holes indicated in the illustration. For added support, fixing screws may also be installed in other holes.

HOLE DRILLING

1. Determine the wall hole position.
2. Drill a ø3 in. (ø75 mm) hole. The outdoor side should be 6/32 to 9/32 in. (5 to 7 mm) lower than the indoor side.
3. Insert wall hole sleeve (C).

HOLE POSITIONS

INDOOR UNIT PREPARATION
Remove the front panel of the indoor unit.

1. Push down the tab on the both sides of the unit to open the front panel.
2. Pull the front panel toward you to remove it.
3. Remove the 2 screws.
4. Open the rear horizontal vane.
5. Push the 2 locations on the top of the panel, and then pull the upper part of the panel toward you.
6. Remove the panel while lifting it up (slightly).

INDOOR UNIT INSTALLATION

INSTALLING THE INDOOR UNIT ON THE FLOOR

1. Place the indoor unit on the flat floor.
2. Fix the indoor unit at 4 points with the included wood screws (9) and washers (10). Tighten the screws securely.

MOUNTING THE INDOOR UNIT ON THE WALL

1. Hook the top of the indoor unit on the indoor unit mounting bracket (7).
2. Fix the indoor unit at 4 points with the included wood screws (9) and washers (10). Tighten the screws securely.

EMBEDDING THE INDOOR UNIT IN A WALL

1. Make a hole in the wall.
2. Using reinforcement material, adjust the depth.
3. Remove 6 screws that fix the base to the unit. Remove the base from the unit.
4. Fix the indoor unit at 4 points with the included wood screws (9) and washers (10). Tighten the screws securely

PIPE FORMING AND INSTALLATION

Note: Refer to 4. FLARE CONNECTION, PIPE CONNECTION.

Pipe Forming

• Route the drain hose diagonally below the connecting pipes.
• Make sure that the drain hose is not routed upward and that there are no waves in the hose.
• Do not pull the hose when applying the tape.
• Route the piping so that it does not project past the rear of the indoor unit.
  (Refer to the figure to the right.)

Connecting Pipe Installation

• Install the connecting pipes so that the piping can move slightly to the front, back, left, and right.

• Be sure to insulate the connecting pipes so that they do not contact the panel.

• Be careful not to crush the connecting pipes when bending them.
  (Use a tube benders for left or right piping.)

• The pipe cover cannot be attached without connecting the conduit pipe after connecting the pipes.

FOR LEFT OR LEFT-REAR PIPING
Bundle the connecting pipes and drain hose together, and then wrap them in felt tape (11).
Cut and use the lower side panels on the left and right sides of the indoor unit as shown below.
Smooth the cut edges of the side panels so that they will not damage the insulation coating.

• For left or right piping
• Installing flush against a wall with molding

Wrap the felt tape (11) tightly around the pipes and hose starting near where the pipes and hose are routed from the indoor unit. (The overlap width of the felt tape (11) should not be more than 1/2 of the tape width.)

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 installed when the indoor unit is powered from the outdoor unit.

1. Remove the electrical cover.
2. Remove the conduit plate.
3. Attach the conduit pipe to the conduit plate with the lock nut. The indoor/outdoor unit connecting wire (A) appearing from the inside of conduit pipe should be less than 7/8 in. (23 mm). (Fig. 1)
4. Process the end of ground wire (Fig. 2). Connect it to the ground terminal of the electrical parts box.
5. Process the end of indoor/outdoor unit connecting wire (A) (Fig. 2). Attach it to the terminal block. Be careful not to make mis-wiring. 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. Reinstall the electrical cover.

Remark:
Use a ring tongue terminal in order to connect a ground wire to terminal.

• Make earth wire a little longer than others. (More than 45 mm)
• For future servicing, give extra length to the connecting wires.
• Do not fold the excess wire, or cram it into small space. Take caution not to damage the wires.
• Be sure to attach each screw to its correspondent terminal when securing the cord and/ or the wire to the terminal block.

DRAIN PIPING

• If the extension drain hose has to pass through a room, be sure to wrap it with commercially sold insulation.
• The drain hose should point downward for easy drain flow. (Fig. 1)
• If the drain hose provided with the indoor unit is too short, connect it with drain hose (J) that should be provided at your site. (Fig. 2)
• Use tape or some other material to seal the connection between the product’s drain hose and extension drain hose (5/8 in. (16 mm) inner diameter) (J).
• When connecting the drain hose to the hard vinyl chloride pipe, be sure to insert it securely into the pipe. (Fig. 3)

The Drain hose is removed at installation.

• When routing the drain piping, make sure that the drain hose (1) is routed as shown. (Fig. 4)

• Insert the drain hose all the way to the base of the drain pan (end connection). (Fig. 5)
  Make sure that the catch of the drain hose is securely hooked onto the projection on the hose fitting of the drain pan.

• After connecting the drain hose, be sure to pull the hose to confirm that it is connected securely.

FRONT PANEL INSTALLATION

1. Open the rear horizontal vane.
2. Attach the panel. Make sure that the catches are engaged.
3. Fix the panel with screws.
4. Insert the bottom part of the front panel.
5. Push 3 places on the upper part of the front panel to close it.

CONNECTING AN INTERFACE (option)/CONNECTOR CABLE (option) TO THE AIR CONDITIONER

Connect an interface/connector cable to the indoor control P.C. board of an air conditioner with a connecting cable.

• Cutting or extending the connecting cable of the interface/connector cable results in defects in connecting. Do not bundle the connecting cable together with power supply cord, indoor/outdoor connecting wire, and/or earth 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. Remove the panel.
2. Open the cover of the indoor control P.C. board.
3. Join the connecting cable to CN105 and/or CN24 on the indoor control P.C. board.
4. Route the connecting cable through this point in the figure.
5. Attach the cable clamp provided with interface/connector cable to the thick part of the connecting cable with a screw 4×16 as shown in the figure.
6. Close the cover of the indoor control P.C. board. Be careful not to catch the thin part of the connecting cable in the cover. Reinstall the panel.

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

OUTDOOR UNIT INSTALLATION

CONNECTING WIRES FOR OUTDOOR UNIT

1. Remove the service panel.
2. Remove the conduit cover.
3. Attach the conduit connectors to the conduit plate with lock nuts then secure it against unit with screws.
4. Connect the ground wires of indoor/outdoor unit connecting wire (A) and power supply cord (K) to the TB support.
5. Loosen the terminal screws, then attach indoor/outdoor unit connecting wire (A) and power supply cord (K) from the indoor unit correctly to the terminal block. Attach the wires to the terminal block securely so that the cores 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. Install the conduit cover.
8. Install the service panel securely.

< KJ09/12>

• Make earth wire a little longer than others. (More than 4 in. [100 mm])
• For future servicing, leave some slack in the connecting wires.
• Be sure to attach each screw to its correspondent terminal when securing the cord and/or the wire to the terminal block.

PIPE FORMING AND INSTALLATION

Note: Refer to 4. FLARE CONNECTION, PIPE CONNECTION.

INSULATION AND TAPING

1. Cover piping joints with pipe cover.
2. For outdoor unit side, insulate the piping, including valves.
3. Apply piping tape (G) starting from the connection on the outdoor unit.
   • When piping has to be installed through a ceiling, closet or where the tem-perature and humidity are high, use additional field-supplied insulation to prevent condensation.

FLARE CONNECTION, PIPE CONNECTION

FLARE CONNECTION

1. Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2)
2. Remove all burrs from the cut section of the pipe, ensuring that precautions are taken to avoid getting metal shavings into the piping. (Fig. 3)
3. Remove flare nuts attached to indoor and outdoor units, then put them on pipe.
4. Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the table. Select A inch (mm) from the table according to the tool you use.
5. Check
   • Compare the flared work with Fig. 6.
   • If flare is defective, cut off the section and repeat procedure.

Pipe diameter inch (mm)|

B inch (mm)

| A 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

ø 1/4 (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
ø 3/8 (9.52)| 7/8 (22)| 25 to 30

(350 to 420)

| 34.4 to 41.2
ø 1/2 (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
ø 5/8 (15.88)| 1-5/32 (29)| 54 to 58

(750 to 800)

| 73.5 to 78.5

PIPE CONNECTION

• Fasten flare nut with a torque wrench as specified in the table.
• When fastened too tight, flare nut may eventually break 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 indoor unit.

• Do not apply refrigeration oil on screw threads. Excessive tightening torque will result in damage on the screw.
• For connection, first align the center, then tighten the first 3 to 4 turns of flare nut by hand.
• Use tightening torque table above as a guideline for 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 following the same procedure detailed in indoor unit connection.

For tightening, use a torque wrench or spanner.

WARNING
When installing the unit, securely connect the refrigerant pipes before starting the compressor.

PURGING PROCEDURES, LEAK TEST, AND TEST RUN

PURGING PROCEDURES AND LEAK TEST

1. Remove service port caps from stop valves on both sides of refrigerant lines.(The stop valves are fully closed when shipped.) Leave closed.
2. Connect gauge manifold to ports of stop valves.
3. Evacuate the system to 4000 microns from both service valves. System manifold gauges must not be used to measure vacuum. A micron gauge must be used at all times. Break the vacuum with Nitrogen(N2) into the discharge service valve to 0 PSIG.
4. Evacuate the system to 1500 microns. Break the vacuum with Nitrogen(N2) into the discharge service valve to 0 PSIG.
5. Evacuate the system to 500 microns.
6. Close gauge manifold valves, stop the pump, and conduct a 30 minute rise test.
7. System should hold 500 microns for a minimum of 1 hour.
8. Fully open all stop valves on both sides of gas pipe and liquid pipe. Operating without fully opening lowers the performance and this causes trouble.
9. Refer to 1-3. and charge the prescribed amount of additional refrigerant if needed. Be sure to charge slowly with liquid refrigerant. Otherwise composi-tion of the refrigerant in the system may be changed and affect performance of the air conditioner.
10. Remove gauge manifolds and replace service port caps and tighten.
11. Leak test

TEST RUN

1. Insert power supply plug into the power outlet and/or turn on the breaker.

2. Press the E.O. SW once for COOL, and twice for HEAT operation. 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 (A) for mis-wiring. After the test run, emergency mode (set temperature 75°F [24°C]) will start.

3. 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 (12) and listen for an audible indicator 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.

AUTO RESTART FUNCTION
This product is equipped with an auto restart function. When the power supply is cut off during operation, such as during blackouts, the function automatically starts operation in the previous setting once the power supply is resumed.
(Refer to the operating instructions for details.)

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. If this procedure is not performed, the unit will automatically begin operation when power supply is resumed.

To the user

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

EXPLANATION TO THE USER

• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (the remote controller, removing the air filters, placing or removing the remote controller from the remote controller holder, cleaning methods, precautions for operation, etc.)
• Recommend that the user read the OPERATING INSTRUCTIONS carefully.

PUMPING DOWN

When relocating or disposing of the air conditioner, pump down the system following the procedure below so that refrigerant is not released into the atmosphere.

1. Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.

2. Fully close the stop valve on the liquid pipe side of the outdoor unit.

3. Close the stop valve on the gas pipe side of the outdoor unit almost completely so that it can be easily closed fully when the pressure gauge shows 0 psi [Gauge] (0 Mpa).

4. Start the emergency COOL operation.
   To start the emergency operation in COOL mode, disconnect the power supply plug and/or turn off the breaker. After 15 seconds, connect the power supply plug and/or turn on the breaker, and then press the E.O. SW once. (The emergency COOL operation can be performed continuously for up to 30 minutes.)

5. Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure gauge shows (0.1 to 0 psi [Gauge] (0.05 to 0 Mpa)).

6. Stop the emergency COOL operation.
   To stop operation, press the E.O. SW several times until all LED lamps turn off. Refer to operating instructions for details.

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.

HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

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