Wet Protection Control I - Daikin FTX25JVEA9 Service Manual

Si18-201
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.
Main Functions
65.0
60.0
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
15.0
-25 -20 -15 -10
Outside air temp.
Lower Limit of
Frequency
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-5 0 5
102/64 × Outside air temp.
(M1025)
30
30
30
30
32
35
38
41
44
48
51
54
57
60
System control
10
135