Carrier 42HVM109303 Service Manual page 37

The anti-cold wind function is as below:
Auto fan action in heating mode.
For MS11M-09HRFN1-MW0W, MS11M-12HRFN1-MV0W, MS11M-18HRFN1-MU0W models:
For MS11M-24HRFN1-MT0W model:
8.4.3.4 Defrosting mode
Condition of defrosting:
℃
----T4＞0 ,
When the units are running, if the following two items are satisfied, the units start defrosting:
The units run with T3＜3
T1-Ts+ΔT
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
-6.0
-6.5
T1-Ts
2.5
2.0
1.5
1.0
℃
for 40 minutes and T3 keeps lower than
L
(H+-L)*0.2+L
(H+-L)*0.4+L
(H+-L)*0.6+L
(H+-L)*0.8+L
H+
Low
Medium
High
TCDI
37
℃
for more than 3 minutes.