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Only for training and service purposes
Part 2 Functions & Controls
5.5.2 18,24,30kBtu/h Model
• Starting the defrosting operation
1) Defrost operation will start when the conditions below are met:
a) Accumulation time of operation and the period after completion of defrost = 35 min.
b) After 10 minutes from re-starting the compressor and over 35 minutes of accumulated operating time,
defrosting operation starts after 10 minutes.
c) Piping temperature of the outdoor heat exchanger is maintained below the defrost starting temperature for 4
minutes after 35 minutes continuous operation.
d) Exceeding 10 minutes after oil recovery operation
2) Outdoor piping temperature is below –6°C (21.2°F, Option) for starting defrosting operation.
Defrosting
Comp. Freqency
Model (kBtu/h) Defrosting Comp. Frequency EEV
18 90Hz 350
24 77Hz 350
30 90Hz 350