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Get instant access to all the maintenance information you need. Empower technicians to perform preventive maintenance with asset packages, ready to use right out of the box.
Find all the essential guides in one place.
Tensioning Guide
Belt-diagram
C-120 pulleys
+ 13 more
Pre-built workflows to keep your asset running smoothly.
Daily Electrical System Inspection
Replace Roller and Pulley
Install Engine B-120
+ 29 more
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Motion Industries
Applied Industrial Technologies
Electrical Brothers
+ 5 more
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Drive Motor
B2 Rollers
Tensioning System
+ 40 more
Daikin Indoor Concealed Ceiling Unit BQ35D2VEB
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Excessive Refrigerant Charging Check
As criteria for judging whether refrigerant is excessively charged or not, refer to the following operating conditions.
<Diagnosis of excessive refrigerant charging>
In cooling operation
(1) Because high pressure rises due to excessive charging, overload control is carried out and capacity tends to run short.
(2) Considering pressure load, compressor discharge pipe temperature is low.
(3) Subcooled degree of condensate liquid becomes large. Therefore, temperature of blown air passing through subcooled part decreases in heating operation.
*3 This measured temperature is used to calculate the equivalent saturation pressure of the refrigerant.
(Refer to P.200.);
Switchbox Removal
Warning: Turn off the power before working on the electrical wiring.
Caution: Removing electrical components
Remove the cover screws before removing an electrical component.
Replace the grease on the heat sink with new grease.
Removal
Remove fixation screw A (2 screws)
Lift and pull the cover in the direction of the arrow
Pull the refrigerant pipe forward
Remove fixation screw B (4 screws)
Inadequate Refrigerant Check
Diagnosis of inadequate refrigerant in cooling operation
Suction superheat degree increases due to refrigerant shortage
Decreased evaporator capacity caused by refrigerant shortage
Compressor frequency decreases despite a large difference between temperature set by the remote controller and indoor suction temperature
Refrigerant shortage worsens, the electronic expansion valve remains fully open and suction superheat degree further increases
Diagnosis of inadequate refrigerant in heating operation
Suction superheat degree increases due to refrigerant shortage
Compressor frequency decreases because suction superheat degree is controlled to prevent oil to the outdoor heat exchanger from being retained
Evaporator capacity and compressor frequency decrease despite a large difference between temperature set by the remote controller and indoor suction temperature
Thermistor Check
Warning: This procedure requires trained personnel!
Disconnect the thermistor from the PCB
Read the temperature
Read the resistor value
Check if the measured values correspond with the values in the table
Sign off on the thermistor check
Power Transistor Check
Warning: Do not touch the charged area (high voltage) for 10 minutes after turning the power supply off.
If you must touch such an area, make sure that the power supply voltage of power transistor is 50 V or less.
Disconnect the connector of the outdoor unit fan motor.
When the outdoor unit fan is rotating against a strong wind, the condenser is charged and electric shock may result. Therefore, disconnect the connector from the outdoor unit fan motor after confirming that the outdoor unit fan has stopped.
Before measuring the continuity, disconnect the connection between compressor and power transistor.
Measure the continuity in the following procedure.
Power transistor (on inverter PCB) continuity check
If there is continuity, enter the resistance value
Note: If a digital tester is used for the measurement of continuity, ∞ and continuity may be reversed.
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