Carrier 42QHF012DS Service Manual page 50

(3) Anti-freezing control to indoor evaporator in cooling mode
Evaporator Temp.
Console,
A5 duct
A3
four-way
cassette
(compact)
The other
types
(4) PTC function is invalid and sleep mode can be set by using a remote controller.
11.7.2.4 Evaporator low temperature T2 protection
When T2<4℃, the indoor has no capacity demand and resume till T2>8℃
11.7.3 Dry mode
11.7.3.1 Indoor fan speed is fixed at breeze and can't be changed. The louver angle is the same as in
cooling mode.
11.7.3.2 Low indoor room temperature protection
In drying mode, if room temperature is lower than 10℃, the indoor fan will stop and not resume until room
temperature exceeds 12℃.
11.7.3.3 Evaporator anti-freezing protection and condenser high temperature protection are active and the
same as that in cooling mode.
11.7.3.4 The outdoor fan operates the same as in cooling mode.
11.7.4 Heating mode
11.7.4.1 Compressor running rules
The compressor will run at corresponding frequency according to the gross amendatory capacity demand.
Frequency
Amendatory capacity demand.
11.7.4.2 Outdoor fan running rules
4
3
1
T2≤ 4℃
T2> 8℃
T2B<0℃ for 250s
T2B> 10℃
T2≤ 3℃ Off(After 3 minutes)
T2> 7℃
0 HEAT_F1
0
High
Medium
Low
Compressor
Off
On
Off
On
On
HEAT _F2
1 2
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...... HEAT_F15
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HEAT _F16
16