Si18-201 System control
Main Functions 135
3.17 Wet Protection Control I
Outline When the outside air temperature is low, the lower limit of operating frequency is restricted to
ensure the compressor suction air humidity.
Details The lower limit of operating frequency (FCG) is set according to following formula and diagram
when the outside air temperature (DOA) is 6.5°C or lower during heating operation.
FCG = KCG1W ×outside air temp. (DOA) + FCG7W = 102/64 × (DOA) + 28
Outside Air Temp. Lower Limit of
Frequency
630
430
230
030
-2 32
-4 35
-6 38
-8 41
-10 44
-12 48
-14 51
-16 54
-18 57
-20 60
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
Operating frequency
-25 -20 -15 -10 -5 0 5 10
Outside air temp. 102/64 × Outside air temp.
(M1025)
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