Daikin Indoor Cooling/Heating Unit FXMQ12PBVJU

Superheating temperature control in cooling is conducted by indoor unit electronic expansion valve

Superheating temperature control in heating is conducted by outdoor unit electronic expansion valve (main)

Judgement criteria of superheat operation:

Suction gas superheated degree (should be 10°C (50°F) and over)

Discharge gas superheated degree (should be 45°C (113°F) and over, except immediately after compressor starts up or is running under drooping control)

Does the superheat operation meet the judgement criteria?

Comments on the superheat operation check

Sign off on the superheat operation check

Warning: This procedure requires trained personnel with PPE!

Enter the compressor capacity control

Low pressure protection control functional?

Hot gas bypass control functional?

Enter the superheated degree control of indoor unit electronic expansion valve

Enter the superheated degree control of outdoor unit heat exchanger

Overload control causing insufficient cooling capacity

Superheated degree of suction gas

Compressor lower in discharge pipe temperature despite of pressure loads

In heating, the temperature of discharge air through the subcooled section becomes lower

Superheated degree of suction gas

Normal vacuuming and dehydration

Vacuum pump that enables vacuuming down to –100.7 kPa (–14.6 psi) is used

Degree of vacuum reached –100.7 kPa (–14.6 psi) or less

Leak tests conducted if vacuum does not reach –100.7 kPa (–14.6 psi) or less after 3 hours

Compressor left at the degree of vacuum of –100.7 kPa (–14.6 psi) or less for a period of 1 hour or more

Vacuum gauge reading does not rise after 1 hour

Necessary amount of refrigerant charged

Special vacuuming and dehydration - In case of moisture may get mixed in the piping

Remove the connector for electronic expansion valve (X7A) from PCB

Check continuity between White and Yellow

Measure resistance value between White and Orange

Measure resistance value between White and Red

Measure resistance value between Yellow and Blue

Measure resistance value between Yellow and Brown

Sign off on the Electronic Expansion Valve Coil Check