Daikin Indoor Unit Wall Mounted Type FTXS71FV1B

2. Check motor power supply voltage output (pins 4-7 and 4-8).

3. Check motor control voltage (pins 4-3).

4. Check rotation command voltage output (pins 4-2).

5. Check rotation pulse input (pins 4-1).

2. Check motor control voltage output (pins 2-1).;

Warning: Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work.

Warning: Ventilate when refrigerant leaks during the work. (If refrigerant contacts fire, it will cause to arise toxic gas.)

Caution: Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas welding rod.

Caution: From the viewpoint of global environment protection, do not discharge the refrigerant gas in the atmosphere. Make sure to recover the refrigerant gas with the recovery system.

Refrigerant gas recovered with the recovery system

Sign off on the distributor removal

Voltage of 320±30V is being applied

Stop the operation first and then the power, and disconnect the connector S70

DC voltage between pins 4 and 7

With the system and the power still off, reconnect the connector S70

Turn of the fan motor with a hand, and make sure the pulse (0-15 V) appears twice at pins 1 and 4

Is the fan motor protection fuse blown out?

If the fan motor protection fuse is blown out, the outdoor-unit fan may also be in trouble. Check the fan too

If the voltage in Step (2) is not applied, it means the PCB is defective. Replace the PCB

With the power ON, operation OFF, and the connector connected, check the following

Output voltage between pins 1 and 3

Number of pulses between pins 2 and 3 when the fan motor is operating

Action to take based on failure result

Warning: Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work.

Be sure to apply nitrogen replacement when heating up the brazed part.

1. Restore the piping by nonoxidation brazing.

In case of you cannot use the nitrogen gas, restore as quickly as possible.

2. It is required to prevent the carbonization of the oil inside the four way valve and the deterioration of the gaskets affected by heat. For the sake of this, wrap the four way valve with wet cloth and provide water so that the cloth will not be dried and avoid excessive heating. (Keep below 120°C)

Be careful so as not to break the pipes by pressing it excessively by pliers when withdrawing it.

In case of the difficulty with gas brazing machine

1. Disconnect the brazed part where is easy to disconnect and restore.