York R-410A Technical & Service Manual page 56

Outdoor
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4.2) 28kw -Single fan
Instruction of temperature sensor:
T1: Ambient temperature sensor is used to compare to the setting temperature and judge and
decide the open degree of EXV and decide the output capacity (for indoor units every indoor
unit has a T2 temperature sensor).
T2: Middle temperature sensor of evaporator, is used to modify the open degree of indoor unit
EXV compared to the average temperature of T2 (for indoor units every indoor unit have a T2
temperature sensor) Available in cooling mode
T2B: outlet temperature of evaporator, is used to modify the open degree of indoor unit EXV
compared to the average temperature of T2B (for indoor units every indoor unit have a T2B
temperature sensor) Available in heating mode
T3: outlet temperature of condenser (in cooling mode), is used to judge whether the system
should to operate defrosting program and judge whether should be stop the defrosting program.
T4: Outdoor ambient temperature, it has two functions: a. to adjust the speed of outdoor fan
motor; b. to modify the output of system.
T5: discharge temperature of compressor, is used to protect the compressor avoid damage
because of superheating
Instruction of other important components:
A. Compressor: Adopts the Copeland (In USA) Digital scroll compressor and controls the output
capacity range from 10% to 100% step less capacity modulation.
B. High-pressure accumulator: In the partial load, the excrescent refrigerant will be storage in
this equipment and decrease the load and power input.
C. Low-pressure accumulator: In the partial load, the excrescent refrigerant will be storage in
this equipment and decrease the load and power input.
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