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9.15.3.4. Deice Control
A. Deice operation (Normal Deice Operation)
1. Detection methods
Outdoor heat exchanger temperature sensor, timer.
2. Deice operation time chart
Notes
• During deice operation, as relationship for outdoor piping temperature and time T5, the priority given to the condition which
is first fulfilled and shift to the next mode.
• First deice after operation restricted to 60 min. & above.
• No restart operation if compressor OFF for sequence No. 8, 9.
(Instantaneous, restart)
3. Deice operation judgement condition
When any of below a, b, c, d condition is satisfied, deice signal is produced.
a. Continuously, outdoor heat exchanger temperature < 3
q
C for 120 minutes and outdoor heat exchanger temperature
< -6qC for 3 minutes and outdoor air temperature > -1qC and Comp. is ON.
b. Continuously, outdoor heat exchanger temperature < 3
q
C for 80 minutes and outdoor heat exchanger temperature < -7
q
C
for 3 minutes and outdoor air temperature > -1
q
C and Comp. is ON.
c. Continuously, outdoor heat exchanger temperature < 3
q
C for 40 minutes and outdoor heat exchanger temperature < -9
q
C
for 3 minutes and outdoor air temperature -3
q
C and Comp. is ON.
d. Continuously, outdoor heat exchanger temperature < 3
q
C for 40 minutes and outdoor heat exchanger temperature
< -11
q
C for 3 minutes and outdoor air temperature < -3
q
C and Comp. is ON.
However, the first deice will start only after minimum of 60 minutes in operation.
(2nd deice and onward shall follow above conditions)
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