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Only for training and service purposes
Part 2 Functions & Controls
5.9.2 18,24,30kBtu/h Model
1) Detection : check the output DC voltage of Current Transformer(CT).
2) Current Transformer Sensing Error
a) In initial power input, if the CT output is over 4.0V (25A) it shows.
Error Code 40 (defect in CT sensing)
3) CT 1 detection :
a) If total current exceeds the value of CT1, then the operating frequency will be reduced by 1 step.
- Step down 10Hz from current step.
- If new Hz is below the minimum frequency 15Hz, then turn off the compressor.
b) After step down,if the total current exceeds CT1 for more than 5 sec. then the compressor will step down 1
more step.
c) If the current continue below „1 for more than 1 min.,return the Hz to setting Hz.
4) CT 2 detection :
a) If total current exceeds CT2, the compressor will turn off.
after 3 min the compressor and check the current again.
b) If the CT2 condition occurs 5 times within 1 hour, then the unit will stop operating and Error Code 22 will be
displayed.
Model CT 1 CT 1
CT 2
(kBtu/h) (Cooling) (Heating)
18 11A 12A 14A
24 14A 12A 15.5A
30 11A 12A 14A