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Symbol

Diagnosis

Diagnosis method

F96

IPM (Power transistor
module) or
compressor
overheating

When this trouble is detected from the electrical parts radiation fin temperature sensor and OLP output during
operation, operation stops, and it is restarted 3 minutes later. If the trouble occurs on 4 occasions, operation
stops, and the trouble display appears.
<Diagnosis checkpoint>
 1. 

Something may be interfering with the dissipation of the heat outdoors or the outdoor unit fan may be
defective. (The outdoor unit fan is not running.)

 2. 

Defective IPM (outdoor unit control P.C. Board)

 3. 

Gas leaks. Shutting valve is not opened.

F97

Compressor high
discharge
temperature

This trouble display appears and operation stops when this happens on 6 occasions (it is cleared when the
operation is normal for 20 minutes).
<Diagnosis checkpoint>
 1. 

Check the refrigerating cycle: Gas may be leaking (the amount of refrigerant is low). The stopping of the
outdoor unit from time to time is a symptom of this trouble.

 2. 

When operation steps with this trouble display appearing, check the compressor temperature sensor
(check for changes in its characteristics and check its resistance).

 3. 

Something may be interfering with the dissipation of the heat outdoors or the outdoor unit fan may be
defective. (The fan will not run because of an open circuit.)

(The protection function may be activated by an overload, and the F97 trouble display will remain stored
in the memory.)

F98

Total running current
protection

When the total current exceeds the setting (17A to 20A), frequency control is started, and if it then exceeds the
setting, operation stops, and the trouble display appears.
<Diagnosis checkpoint>
 1. 

Check the AC voltage at the outdoor unit terminal board during operation: The voltage drop must be within
5% of the voltage when operation has stopped (± 110% of rated voltage even during operation). If the
voltage drop exceeds 5% or if the voltage changes suddenly, inspect whether the power supply cord and
indoor/outdoor unit connection cables are too long or too small in diameter, etc.

 2. 

Check whether something is interfering with the dissipation of the heat outdoors (during cooling
operations): Normally, the capacity is limited by the current so that the outdoor unit don’t stop, and the
diagnostic display does not appear.

F99

DC peak detection

When “Output current trouble”, which occurs when the prescribed current level is exceeded, has occurred on
16 consecutive occasions, operation stops, and the trouble display appears.
<Diagnosis checkpoint>
 1. 

Check whether the compressor is defective (locked up or shorted winding). Check the outdoor unit control
P.C. Board.

29

1. Philips screw driver
2. Level gauge
3. Electric drill, hole core drill 
 (ø70 

mm)

4. Hexagonal wrench (4 mm)
5. Spanner
6. Pipe cutter

7. Reamer
8. Knife
9. Gas leak detector
10. Measuring tape
11. Thermometer
12. Megameter
13. Multimeter

14. Torque wrench
      18 N•m (1.8 kgf.m)
      42 N•m (4.2 kgf.m)
15. Vacuum pump

16. Gauge manifold

Required tools for Installation Works

•   Read the following “SAFETY PRECAUTIONS” carefully before installation.
•   Electrical work must be installed by a licensed electrician. Be sure to use the correct rating of the power plug and main 

circuit for the model to be installed.

•   The caution items stated here must be followed because these important contents are related to safety. The meaning of 

each indication used is as below. Incorrect installation due to ignoring of the instruction will cause harm or damage, and the 
seriousness is classified by the following indications.

•   Carry out test running to confirm that no abnormality occurs after the installation. Then, explain to user the operation, 

care and maintenance as stated in instructions. Please remind the customer to keep the operating instructions for future 
reference.

WARNING

This indication shows the possibility of causing death or serious injury.

CAUTION

This indication shows the possibility of causing injury or damage to properties only.

Symbol with background white denotes item that is PROHIBITED from doing.

1)

Engage dealer or specialist for installation. If installation done by the user is defective, it will cause water leakage, 

electrical shock or fire.

2)

Install according to this installation instruction strictly. If installation is defective, it will cause water leakage, electrical 

shock or fire.

3)

Use the attached accessories parts and specified parts for installation. Otherwise, it will cause the set to fall, water leakage, 

fire or electrical shock.

4)

Install at a strong and firm location which is able to withstand the set's weight. If the strength is not enough or 

installation is not properly done, the set will drop and cause injury.

1)

This equipment must be earthed. It may cause electrical shock if grounding is not perfect.

5)

For electrical work, follow the local national wiring standard, regulation and this installation instruction. An independent 

circuit and single outlet must be used. If electrical circuit capacity is not enough or defect found in electrical work, it will
cause electrical shock or fire.

3)

Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and 

damage the furniture.

7)

Wire routing must be properly arranged so that control board cover is fixed properly. If control board cover is not fixed 

perfectly, it will cause heat-up at connection point of terminal, fire or electrical shock.

6)

Use the specified cable (1.5 mm

2

) and connect tightly for indoor/outdoor connection. Connect tightly and clamp the cable 

so that no

 externa

l force will be acted on the terminal. If connection or fixing is not perfect, it will cause heat-up or fire at the 

connection.

8)

When carrying out piping connection, take care not to let air substances other than the specified 

refrigerant go into refrigeration cycle.

8)

Otherwise, it will cause lower capacity, abnormal high pressure in the refrigeration cycle, explosion and 

injury.

9)

When connecting the piping, do not allow air or any substances other than the specified refrigerant 

(R410A) to enter the refrigeration cycle. Otherwise, this may lower the capacity, cause abnormally high 
pressure in the refrigeration cycle, and possibly result in explosion and injury.

10) Do not modify the length of the power supply cord or use of the extension cord, and do not share the 

single outlet with other electrical appliances. Otherwise, it will cause fire or electrical shock.

2)

Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and 

accumulates at surrounding of the unit, it may cause fire.  

2)

Do not release refrigerant.

3)

Do not release refrigerant during piping work for installation, reinstallation and during repairing a refrigeration parts. Take 

care of the liquid refrigerant, it  may cause frostbite.

3)

Installation work.

4)

It may need two people to carry out the installation work.

4)

Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.

1)

Selection of the installation location.

1)

Select a installation location which is rigid and strong enough to support or hold the unit, and select a location for easy 

maintenance.

The items to be followed are classified by the symbols:

30

No.

No.

No.

Accessory part

Accessory part

Accessory part

Qty.

Qty.

Qty.

Piping insulation

Band

Remote control

Battery

Remote control holder

Drain joint
 

Pattern

Remote control holder  
fixing screw 

Pattern fixing screw 

1

2

6

3

4

5

7

8

9

2

4

2

1

2

1

1

1

4

VP20 (outer diameter ø26) ; also sockets, elbows and other 
parts as necessary

PVC adhesive

For refrigerant piping insulation 
(foamed polyethylene with a thickness of 8 mm or more)
For drain piping insulation 
(foamed polyethylene with a thickness of 10 mm or more)

4×1.5 mm

2

 

flexible cord, type designation 245 IEC 57 (H05RN-F) 

(See "Connecting the Indoor/Outdoor Connecting Cable".)

Hanging bolts (M10) (4) and nuts (12), Flat washers (8)

 

Rigid PVC pipe

Adhesive

Insulation

Indoor/outdoor 
connecting cable

Hanging bolt related parts

Determine the location with the agreement of the customer.

The location should be strong enough to support the main unit without vibration.
There should not be any heat or steam sources nearby.
Drainage should be easy. Avoid locating the drain port close to ditches
 (domestic wastewater).
Avoid locations above entrances and exits.
Ensure the distances indicated by the      marks in the illustration.
Ensure sufficient space for installation and servicing.
The ceiling surface (lower surface) should be level.
Locate the indoor unit at least 1 m or more away from a TV, radio, wireless 
equipment, antenna cables and fluorescent lights, and 2 m or more away 
from a telephone.

Note that if the air conditioning unit is installed near an electronically lit 
fluorescent light (inverter, rapid start type, etc.), it may not receive the 
remote control signals.

Decorative grille

                   

                                CZ-BT20P      
                                   (white)

* See the Outdoor Unit Installation 
  Instructions.

When the wall is hollow, 
please be sure to use the 
sleeve for tube ass'y to 
prevent dangers caused by 
mice biting the connecting 
cable. 

1. Insert the piping sleeve to the hole.
2. Fix the bushing to the sleeve.
3. Cut the sleeve until it extrudes 

about 15 mm from the wall.

4. Finish by sealing the sleeve with 

putty or caulking compound at the 
final stage. 

Liquid side

Gas side

ø 6.35 (1/4") t 0.8

ø 9.52 (3/8") t 0.8

• Prepare the piping set shown in the table 

below or equivalent products for the 
refrigerant piping.

Signals may not be transmitted and received correctly when 
the remote control is operated while in the holder. Take the 
remote control in your hand to operate the unit.
Mount the holder in a location that is not subject to the 
effects of heat (direct sunlight and stoves, etc.).

Bushing for 
tube ass'y 

15 mm

Wall

Sleeve for 

tube ass'y

ø70 through 
hole

Putty or caulking 
compound

Approx. 
5 - 7 mm

Outdoor

Indoor

Remote control holder
fixing screws 

Remote control 
holder

Remote
control  3

5

6

Ceiling

Indoor unit

  20 cm 
or more

Decorative grille

Wall

Discharge vent

Intake

19 cm or 
more

30 cm or 
 more

30 cm or 

more

31

90

(Unit: mm)

(Unit: mm)

Lay the drain piping so as to ensure drainage.
Use a locally purchased VP20 rigid PVC pipe (outer diameter ø26) for the 
drain piping, and connect it to the drain port of the indoor unit using the 
drain joint  7 . Coat both sides with a PVC adhesive and adhere them firmly.
Drain piping located indoors should always be insulated by wrapping with locally 
purchased insulation (foamed polyethylene with a thickness of 10 mm or more).
The drain piping should have a downward gradient (1/50 or more), and should be 
secured using pipe hanging equipment to avoid creating hills or traps partway.

Note that if the main unit 
is not level or if the 
height relative to the 
ceiling surface is not 
appropriate, water may 
leak or condense around 
the discharge vent.

Hold the half-union with a 
wrench, and do not rotate 
the male side.

Absolutely do not install and 
extend the drain piping from the 
main unit drain water outlet 
horizontally or upward or raise it 
20cm or more. Doing so may 
result in poor drainage or cause 
of drain motor failure.

Tighten the refrigerant piping using the torque 
shown in the table to the right.
Cover the piping joint with piping insulation   1   and 
tie the insulation firmly using two bands   2  on both 
sides. Be sure to adhere the insulation closely so 
that there is no gap between the main unit and the 
piping insulation.
When the relative humidity inside the ceiling 
(indoors) is thought to exceed 80% such as in a 
new building during the rainy season or a new 
reinforced concrete structure, moisture may 
condense on the outer surface of the piping 
insulation. In this case be sure to add further  
insulation to the refrigerant piping.

Liquid side 

ø6.35 (1/4")

Gas side

 ø9.52 (3/8")

Pipe diameter

Tightening 

torque

18N • m 

(1.8 kgf • m)

42N • m 

(4.2 kgf • m)

  (Unit: mm)

• Select the unit position and airflow direction so that the 

cool and warm air spreads throughout the whole  room.

• Secure the hanging bolts (M10, locally purchased) firmly 

in the manners shown below in a location that is 
capable of supporting the unit weight.

• When the ceiling materials insufficient strength, it may 

be necessary to make an opening in the ceiling and add 
a framework or other reinforcing structure to maintain 
the levelness of the ceiling and prevent ceiling vibration. 
Consult a construction or interior contractor for details.

Decorative grille 

dimensions

Ceiling opening 

dimensions

Hanging bolt pitch 

dimensions

Main unit 

dimensions

Ceiling depth 

dimension

1070 

× 460

1010 

× 390

830 

× 240

H185 

× W770 × D360

190 or more

Attach the nuts and washers to the 
hanging bolts, then lift up and hook 
the main unit onto the hanging 
fixtures.
Adjust the lower surface of the 
indoor unit relative to the ceiling 
surface as shown in the illustration 
below.
Check the levelness using a level or 
a vinyl hose filled partially with 
water before tightening the nuts.

Should some obstacle prevent the drain piping from being extended 
smoothly, the drain piping can be raised outside the main unit as 
shown in the illustration below.

Check the drainage        Check after connecting the power supply.

Pour approximately 300 to 400 cc of water into the drain pan of the main unit. 
(Pour the water from a squeeze bottle or other vessel as shown in the illustration 
below.)
Press the “DRAIN TEST” switch located on the control box to start the drain 
motor, and check that the water drains normally.
 (The drain motor operates for approximately 5 minutes and then stops automatically.) 

20 cm 
or less

7 cm 
or less

VP20 elbow VP20 pipe

Upward 
gradient
or level

Connect the VP20 elbow directly
to the main unit outlet.

Drain joint  7

Trap

No insulation

Insulation (thickness 

10 mm or more)

Downward gradient 
1/50 or more

Rise

Hill

Downward gradient 
1/50 or more

0     2 mm

0     2 mm

Ceiling surface

Hanging bolt (M10) 
(Locally Purchased)

Hexagonal nut (M10) 
(Locally Purchased)

Flat washer 
(Locally Purchased)

135

55

30

100

70

Refrigerant piping 
(gas side) 3/8"

Refrigerant piping
 (liquid side) 1/4"

Drain connection port 
(connect to VP20)

185

190

95

168

or more

145

30

36.5

770

505

1010

30

505

90

Ceiling opening

415

15

30

415

11

30

Grille center

Hanging bolt

770 Main unit 

175

200

125

185

860

115

190

75

67

72

Grille

Control box position

Connecting cable
Insertion position

Ceiling opening

230

230

1070 Grille

75

Discharge vent 
(lower surface)

60

40

60

390

240 Hanging bolt

360 Main unit

460

40

30

830

Bands   2 

Adhere closely

Piping 
insulation

Insulation 

(locally purchased)

Thickness: 

8 mm or more

Main 
unit

Half-union

Flare nut

Wrench

Torque wrench 
for flare nuts

(Auxiliary pipe)

(17 mm and 12 mm end 
wrench or adjustable spanner)

(Connection pipe)

Drain pan

“DRAIN TEST” 
switch
“AUTO” switch

Intake side

Squeeze bottle

Airflow direction 

control vanes

Hanging 
bolt M10

Ceiling surface

80

Reinforcing materials 
(60 to 90 mm square)

Roof beam

Appro

x.

Hanging 
bolt M10

Insert hole-in 
anchor, etc.

Ceiling surface

80

Appro

x.

 1 

32