The Daikin Outdoor Cooling/Heating Unit REYQ120TATJU is a high-efficiency HVAC system designed for versatile climate control. This unit provides reliable heating and cooling solutions, ensuring optimal comfort in residential and commercial spaces. With advanced technology and robust construction, it delivers exceptional performance and energy savings.

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Manual for Daikin Outdoor Cooling/Heating Unit REYQ120TATJU

MAINTENANCE RESOURCES

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Documents & Manuals

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Tensioning Guide
Belt-diagram
C-120 pulleys
+ 13 more

Work Order Templates

Pre-built workflows to keep your asset running smoothly.

Daily Electrical System Inspection
Replace Roller and Pulley
Install Engine B-120
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Procedures

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Motion Industries
Applied Industrial Technologies
Electrical Brothers
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Parts

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Drive Motor
B2 Rollers
Tensioning System
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Daikin Outdoor Cooling/Heating Unit REYQ120TATJU

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Maintenance Plans for Daikin Outdoor Cooling/Heating Unit Model REYQ120TATJU

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Pressure Check

Details of compressor capacity control while in cooling, refer to Compressor PI control

The low pressure protection control includes low pressure protection control and hot gas bypass control

In cooling, the indoor unit electronic expansion valve is used for superheated degree control

In heating, the outdoor unit electronic expansion valve is used for superheated degree control of outdoor unit heat exchanger

Check for Low Pressure

Enter the pressure reading

Sign off on the pressure check

Run this procedure

Electronic Expansion Valve Coil Check

Warning: This procedure requires trained personnel with PPE!

Electronic Expansion Valve Coil Check

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

Measure the resistance value between pins

No continuity between White and Yellow

Resistance value between White and Orange

Resistance value between White and Orange is approx. 300 Ω

Resistance value between White and Red

Resistance value between White and Red is approx. 150 Ω

Run this procedure

Refrigerant Check

Refrigerant Overcharge Check

High pressure reading

Overload control causing insufficient cooling capacity

Superheated degree of suction gas

Compressor lower in discharge pipe temperature despite of pressure loads

Subcooled degree of condensate

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

Refrigerant Shortage Check

Superheated degree of suction gas

Run this procedure

Power Transistor Check

Warning: Ensure the power is OFF before starting the procedure

Power OFF

All wiring removed from the PCB

Prepare the analog type of multimeter. For the digital type of multimeter, those with diode check function are available for the checking

Power supply turned OFF

Wait for 10 minutes or more before making measurement of resistance

Waited for 10 minutes or more

When using the analog type of multimeter, make measurement in resistance measurement mode in the x1 kΩ range

Measurement made in resistance measurement mode in the x1 kΩ range

Run this procedure

Superheat Operation Check

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

Is the indoor unit electronic expansion valve functioning properly?

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

Is the outdoor unit electronic expansion valve functioning properly?

Judgement criteria of superheat operation: Suction gas superheated degree: 10°C (50°F) and over. Discharge gas superheated degree: 45°C (113°F) and over, except immediately after compressor starts up or is running under drooping control

Enter the suction gas superheated degree

Enter the discharge gas superheated degree

Does the superheat operation meet the judgement criteria?

Sign off on the superheat operation check

Run this procedure