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Floor standing indoor units

In document 1 General operation (сторінка 90-98)

3.8 Indoor unit fan motor

3.8.2 Floor standing indoor units

a A

A Class 20~42 unit

a Indoor unit fan motor cover

a A

A Class 50~71 unit

a Indoor unit fan motor cover

4 Install the switch box, see "3.14 Plate work" [4 143].

Is the problem solved? Action

Yes No further actions required.

No Return to the troubleshooting of the

specific error and continue with the next procedure.

To perform a mechanical check of the turbo fan assembly

Prerequisite: Stop the unit operation via the user interface.

Prerequisite: Turn OFF the respective circuit breaker.

Prerequisite: Remove the required plate work, see "3.14 Plate work" [4 143].

1 Remove the swing flap (by clicking it out).

2 Remove the air outlet protection net to create access to the turbo fan.

a b c

a Swing flap

b Air outlet protection net c Turbo fan

3 Slowly rotate the turbo fan using a long‑length tool.

4 If the turbo fan touches the bellmounth, check if the fan motor is correctly mounted on its base, see "Repair procedures" [4 92].

5 Check the state of the turbo fan assembly for damage, deformations and cracks.

Is the turbo fan assembly damaged? Action

Yes Replace the turbo fan assembly, see

"Repair procedures" [4 92].

No Perform a mechanical check of the DC

fan motor assembly, see "Checking procedures" [4 90].

To perform a mechanical check of the DC fan motor assembly

Prerequisite: First perform a mechanical check of the propeller fan blade assembly, see "Checking procedures" [4 90].

1 Slowly rotate the turbo fan using a long‑length tool. Check that it rotates smoothly.

2 Check the friction of the DC fan motor shaft bearing.

Is the DC fan motor shaft friction normal?

Action

Yes Perform an electrical check of the DC

fan motor assembly, see "Checking procedures" [4 90].

No Replace the DC fan motor assembly, see

"Repair procedures" [4 92].

To perform an electrical check of the DC fan motor assembly

1 First perform a mechanical check of the DC fan motor assembly, see "Checking procedures" [4 90].

2 Turn ON the power of the unit.

3 Activate Cooling or Heating operation via the user interface.

4 Check the functioning of the turbo fan.

Turbo fan … Action

Rotates continuously (without interruption)

DC fan motor assembly is OK. Return to the troubleshooting of the specific error and continue with the next procedure.

Does not rotate or rotates for a short time

Continue with the next step.

5 Turn OFF the unit via the user interface.

6 Turn OFF the respective circuit breaker.

DANGER: RISK OF ELECTROCUTION

Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure the rectifier voltage is below 10 V DC before proceeding.

7 Check that the DC fan motor connector is properly connected to the indoor unit main PCB.

8 Unplug the DC fan motor connector and measure the resistance between the pins 1‑2, 1‑3, and 2‑3 of the DC fan motor connector.

Result: All measurements MUST be 84.9~97.7 Ω.

9 Set the Megger voltage to 500 V DC or 1000 V DC.

10 Measure the insulation resistance for the motor terminals. Measurements between each phase and fan motor body (e.g. axle) MUST be >1000 MΩ.

Are the measured resistance values correct?

Action

Yes Perform a check of the indoor unit main

PCB, see "3.9.1 Checking procedures" [4 98].

No Replace the DC fan motor, see "Repair

procedures" [4 92].

Repair procedures

To remove the turbo fan assembly

Prerequisite: First perform pump down operation. Close the refrigerant circuit stop valves when done.

Prerequisite: Stop the unit operation via the user interface.

Prerequisite: Turn OFF the respective circuit breaker.

1 Remove the required plate work, see "3.14 Plate work" [4 143].

2 Remove the switch box, see "3.14 Plate work" [4 143].

3 Remove the 2 screws and remove the upper air outlet assembly.

a b a

f c

f g

d e

a Screw (upper air outlet assy) b Upper air outlet assy c Drain hose

d Damper motor wiring harness e Screw (tie strap)

f Screw (lower air outlet assy) g Lower air outlet assy

4 Put a small drain pan (or container) under the drain hose.

5 Remove the screw from the fixation bracket and pull the drain hose downwards to remove it from the indoor unit.

6 Route the damper motor wiring harness out of the harness retainers and remove the screw to disconnect the tie strap from the unit.

7 Remove the 2 screws and remove the lower air outlet assembly.

8 Remove the screw and remove the plate from the indoor unit heat exchanger.

a f

d

e b

c

e

a Screw (plate) b Plate

c Indoor unit heat exchanger d Piping fixture

e Flared joint f Screw (ground wire)

9 Release the 2 hooks and remove the piping fixture.

10 Release the flared joint of the (refrigerant) liquid pipe and the gas pipe.

Disconnect the liquid and gas pipes from the refrigerant field piping. Plug the refrigerant field pipes to prevent dirt from entering the pipes.

11 Remove the screw and disconnect the ground wire from the indoor unit heat exchanger.

12 Unfasten the 2 hooks on the left side of the indoor heat exchanger.

a b

a

c

b a Hook (left side)

b Hook (right side)

c Indoor unit heat exchanger

13 Unfasten the 2 hooks on the right side of the indoor heat exchanger and remove the indoor unit heat exchanger.

14 Remove the 4 screws and remove the bellmouth from the indoor unit.

a a

a

b c

a d

a Screw (bellmouth) b Bellmouth

c Nut (turbo fan assy) d Turbo fan assy

15 Remove the nut that fixes the turbo fan assembly.

16 Pull and remove the turbo fan assembly from the DC fan motor assembly.

INFORMATION

Use a pulley remover if the propeller cannot be removed manually.

17 To install the turbo fan assembly, see "Repair procedures" [4 92].

To remove the DC fan motor assembly

1 Remove the turbo fan assembly from the DC fan motor assembly, see "Repair procedures" [4 92].

2 Cut the tie strap and unlock the ferrite core.

a c

d

b c d

d e f

a Ferrite core

b DC fan motor wiring harness c Hook

d Screw (fan motor cover) e Fan motor cover

f Wiring harness retainer

3 Route the DC fan motor wiring harness out of the hooks.

4 Remove the 3 screws and remove the fan motor cover.

5 Unfasten the hooks and remove the wiring harness retainer.

6 Route the DC fan motor wiring harness out of the hooks (behind the harness retainer).

7 Remove the DC fan motor assembly from the indoor unit.

8 To install the DC fan motor assembly, see "Repair procedures" [4 92].

To install the DC fan motor assembly

1 Install the DC fan motor assembly on the fan motor cover.

2 Install the fan motor cover with DC fan motor assembly on the correct location.

3 Install and tighten the 3 screws to fix the fan motor cover.

a c

d

b c d

d e f

a Ferrite core

b DC fan motor wiring harness

c Hook

d Screw (fan motor cover) e Fan motor cover

f Wiring harness retainer

4 Route the DC fan motor wiring harness through the hooks and install the harness retainer. Make sure the wiring harness is also routed through the hooks located behind the harness retainer.

5 Lock the ferrite core on the DC fan motor wiring harness.

6 Install a new tie strap to fix the ferrite core to the indoor unit.

7 Install the turbo fan assembly, see "Repair procedures" [4 92].

To install the turbo fan assembly

1 Install the turbo fan assembly on the DC fan motor assembly.

CAUTION

Do NOT install a damaged turbo fan assembly.

2 Install and tighten the nut to fix the turbo fan assembly.

a a

a

b c

a d

a Screw (bellmouth) b Bellmouth

c Nut (turbo fan assy) d Turbo fan assy

3 Install the bellmouth in the correct location on the indoor unit. Install and tighten the 4 screws to fix the bellmouth.

4 Slowly rotate the turbo fan and check that it does NOT touch the bellmouth.

Repair as needed.

5 Install the indoor unit heat exchanger on the 2 hooks on the right side.

a b

a

c

b a Hook (left side)

b Hook (right side)

c Indoor unit heat exchanger

6 Route the fan motor ground wire in front of the indoor unit heat exchanger.

7 Carefully move the indoor unit heat exchanger to the correct position and install it on the 2 hooks on the left side.

8 Connect the ground wire to the indoor unit heat exchanger using the screw.

a f

d

e b

c

e

a Screw (plate) b Plate

c Indoor unit heat exchanger d Piping fixture

e Flared joint f Screw (ground wire)

9 Make sure that the refrigerant field piping connections are clean and not damaged. Remove the caps and properly connect the field piping to the liquid and gas pipes of the indoor unit. Tighten the flared joints.

10 Correctly install the insulation on the liquid and gas pipes. Install the piping fixture.

11 Install the plate in the correct location on the indoor unit heat exchanger.

Install and tighten the screw to fix the plate.

12 Install the lower air outlet assembly in the correct location. Install and tighten the 2 screws.

a b a

f c

f g

d e

a Screw (upper air outlet assy) b Upper air outlet assy

c Drain hose

d Damper motor wiring harness e Screw (tie strap)

f Screw (lower air outlet assy) g Lower air outlet assy

13 Route the damper motor wiring harness through the appropriate harness retainers.

14 Install the screw to connect the tie strap to the unit.

15 Connect the drain hose to the lower air outlet assembly.

16 Install the drain hose fixation bracket. Install and tighten the screw.

17 Install the upper air outlet assembly in the correct location. Install and tighten the 2 screws.

18 Install the switch box, see "3.14 Plate work" [4 143].

19 Perform a pressure test on the piping of the indoor unit and vacuüm. Open the stop valves when done.

Is the problem solved? Action

Yes No further actions required.

No Return to "Checking procedures" [4 90]

of the indoor unit fan motor and continue with the next procedure.

In document 1 General operation (сторінка 90-98)