Mitsubishi Electric TRANE NTXUKS09A112AA Manuale utente

Models

NTXUKS09A112AA

NTXUKS12A112AA

NTXUKS18A112AA

No. OBHT802

INDOOR UNIT

NTXUKS09A112AA

NTXUKS12A112AA

NTXUKS18A112AA

SERVICE MANUAL

Outdoor unit service manual

NTXMMX•A•AA, NTXMPH•A•AA

Series (OBHT702, OCHT573)

PARTS CATALOG (OBBT802)

CONTENTS

1. TECHNICAL CHANGES ··································· 2

2. PART NAMES AND FUNCTIONS ···················· 3

3. SPECIFICATION ··············································· 4

4. OUTLINES AND DIMENSIONS ························ 6

5. WIRING DIAGRAM············································ 7

6. REFRIGERANT SYSTEM DIAGRAM··············· 8

7. SERVICE FUNCTIONS ····································· 9

8. MICROPROCESSOR CONTROL ··················· 12

9. TROUBLESHOOTING····································· 21

10. DISASSEMBLY INSTRUCTIONS ··················· 35

1TECHNICAL CHANGES

NTXUKS09A112AA

NTXUKS12A112AA

NTXUKS18A112AA

1. New model

Use the specified refrigerant only

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.

Correct refrigerant is specified in the manuals and on the spec labels provided with our products.

We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by

failure to follow the instructions.

Prepare the proper tools.

Prepare the proper protectors.

Provide adequate ventilation.

After stopping the operation of the air conditioner, turn off the power-supply breaker and remove the power plug.

Discharge the capacitor before the work involving the electric parts.

Do not perform the work involving the electric parts with wet hands.

Do not pour water into the electric parts.

Do not touch the refrigerant.

Do not touch the hot or cold areas in the refrigeration cycle.

When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to

touch the live parts.

OBHT802

2PART NAMES AND FUNCTIONS

ACCESSORIES

MODELS NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA

Alkaline battery (AAA) for remote controller 2

Drain hose (with insulation) 1

Special washer (with cushion, 4pcs) 8

Installation template 1

Fixing screw for M5 х 30 mm 4

Band 1

Fixing screw for 4 х 16 mm 2

Remote controller 1

Remote controller holder 1

Fixing screw for 3.5 x 16 mm (Black) 2

INDOOR UNIT

NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA

Display section

Horizontal vane

Vertical vane

Air outlet

Air ﬁlter

(Air purifying ﬁlter)

Air inlet

Air cleaning ﬁlter

(Anti-Allergy Enzyme

filter, option)

Intake grille

Safety strings Spec name plate

Open the display cover Remote control receiving section

Emergency operation switch

Operation indicator lamp

OBHT802

SPECIFICATION

Indoor model NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA

Power supply V, phase, Hz 208/230, 1, 60

Max. fuse size (time delay)/ Disconnect switch

A 15

Airow

High - Med. - Low - SLow

COOL Dry

(Wet)

CFM 311 - 283 - 254 - 212 332 - 297 - 258 - 212 403 - 346 - 293 - 212

HEAT Dry CFM 325 - 290 - 247 - 212 350 - 311 - 272 - 212 417 - 364 - 311 - 212

Sound level

High - Med. - Low - SLow Cooling dB (A) 38 - 34 - 31 - 27 40 - 36 - 32 - 27 47 - 41 - 36 - 29

Heating dB (A) 37 - 34 - 29 - 26 40 - 36 - 32 - 26 48 - 42 - 37 - 26

Cond. drain connection O.D. in. Ø1 (26 mm)

Dimensions Win. 43-3/8

D14-3/16

H7-5/16

Weight Ib. 34

External nish White

Control voltage (by built-in transformer) 12 - 24 V DC

NOTE: Test conditions are based on ARI 210/240.

1. Multi connection

Specifications and rated conditions of main electric parts

Model

Item NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA

Fuse (F11) T3.15AL250V

Horizontal vane motor (MV1) 12 V DC

Vertical vane motor (MV2) 12 V DC

Varistor (NR11) 470 V

DRAIN PUMP (DP) 230 V 6.4 W

FLOAT SENSOR (FS) 5 V DC

OBHT802

● The air coverage is the figure up to the

position where the air speed is 1 ft./s.,

when air is blown out horizontally from

the unit properly at the High speed

position.

The coverage should be used only

as a general guideline since it varies

according to the size of the room and

furniture arranged inside the room.

3-2. OUTLET AIR SPEED AND COVERAGE

1. Multi connection

Model Mode Function Airow

(CFM) Air speed

(ft./s.)

Coverage

(ft.)

NTXUKS09A112AA HEAT Dry 311 13.0 20.7

COOL Dry 325 13.6 21.7

Wet ———

NTXUKS12A112AA HEAT Dry 332 13.9 22.1

COOL Dry 350 14.6 23.3

Wet ———

NTXUKS18A112AA HEAT Dry 403 16.9 26.7

COOL Dry 417 17.5 27.6

Wet ———

(2) OPERATION

*The operating range of the outdoor unit depends on the connected outdoor unit.

Mode Condition Intake air temperature (°F)

Indoor Outdoor

DB WB DB WB

Cooling

Standard temperature 80 67 95 —

Maximum temperature 90 73 115 —

Minimum temperature 67 57 14 —

Maximum humidity 78% —

Heating Standard temperature 70 60 47 43

Maximum temperature 80 67 75 65

Minimum temperature 70 60 -13 -14

3-1. OPERATING RANGE

(1) POWER SUPPLY

Rated voltage Guaranteed voltage (V)

Indoor unit 208/230 V

1 phase

60 Hz

Min. 187 208 230 Max. 253

OBHT802

OUTLINES AND DIMENSIONS

Unit: inch

INDOOR UNIT

NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA

OBHT802

5WIRING DIAGRAM

INDOOR UNIT

NTXUKS09A112AA

NTXUKS12A112AA

NTXUKS18A112AA

OBHT802

REFRIGERANT SYSTEM DIAGRAM

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Indoor coil

thermistor

RT13 (sub)

Flared connection

Refrigerant pipe Ø3/8(Ø9.52)

(with heat insulator)

Refrigerant pipe Ø1/4(Ø6.35)

(with heat insulator)

Indoor coil

thermistor

RT12 (main)

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Indoor coil

thermistor

RT13 (sub)

Flared connection

Refrigerant flow in cooling

Refrigerant flow in heating

Refrigerant pipe Ø1/2(Ø12.7)

(with heat insulator)

Refrigerant pipe Ø1/4(Ø6.35)

(with heat insulator)

Indoor coil

thermistor

RT12,RT14,

RT15 (main)

INDOOR UNIT

Unit: inch(mm)

NTXUKS09A112AA

NTXUKS12A112AA NTXUKS18A112AA

OBHT802

7SERVICE FUNCTIONS

7-1. TIMER SHORT MODE

• For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C.

board. (Refer to 10-7.)

• The set time for the ON/OFF timer can be reduced to 1 second for each minute.

• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to 3

seconds. Restarting the compressor, which takes 3 minutes, cannot be reduced.

NTXUKS09A112AA

NTXUKS12A112AA

NTXUKS18A112AA

Table 1

7-2. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT

A maximum of 4 indoor units with wireless remote controllers can be used in a room.

To operate the indoor units individually with each remote controller, assign a number to each remote controller according

to the number of the indoor unit.

This setting can be set only when all the following conditions are met:

• The remote controller is powered OFF.

• Weekly timer is not set.

• Weekly timer is not being edited.

2. How to set the remote controller

(1) Hold down button on the remote controller for 2 seconds to enter the pairing mode.

(2) Press button again and assign a number to each remote controller.

Each press of button advances the number in the following order: 1 → 2 → 3 → 4.

(3) Press button to complete the pairing setting.

After the setting, turn ON the power supply and with the remote controller headed towards the indoor unit, press the

STOP/OPERATE (OFF/ON) button. If 1 or 2 beeps is heard from the indoor unit, the setting is completed correctly.

The remote controller that first sends a signal to an indoor unit will be regarded as the remote controller for the indoor

unit.

Once they are set, the indoor unit will only receive the signal from the assigned remote controller afterwards.

1. How to modify the electronic control P.C. board

Turn OFF the power supply before modification. To assign a number to each indoor unit , cut off “JR05” and “JR06” on the

electronic control P.C. board as shown in Table 1. (Refer to 9-7.)

Unit No. 1

Unit No. 2

Unit No. 3

Unit No. 4

JR05

No modification

Cut off JR05

No modification

Cut off JR05

JR06

No modification

Cut off JR06

C111

IC101

JR05

JR06

OBHT802

NOTE:

• The operation settings are memorized when 10 seconds has passed after the indoor unit was operated with the remote

controller.

• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is can-

celled.

• If the unit has been off with the remote controller before power failure, the auto restart function does not work as the

power button of the remote controller is off.

• To prevent breaker tripping due to the rush of starting current, systematize other home appliance not to turn on at the

same time.

• When some air conditioners are connected to the same supply system, if they are operated before power failure, the

starting current of all the compressors may flow simultaneously at restart.

Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current

by adding to the system that allows the units to start one by one.

C111

JR77

IC101

How to disable “AUTO RESTART FUNCTION”

Turn off the main power for the unit.

Cut the jumper wire to JR77 on the indoor electronic control P.C. board. (Refer to 9-7.)

Operation

If the main power has been cut, the operation settings remain.

After the power is restored, the unit restarts automatically according to the memory.

(However, it takes at least 3 minutes for the compressor to start running.)

7-3. AUTO RESTART FUNCTION

When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed

are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation

in the same mode just before the shutoff of the main power.

OBHT802

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