5. CONTROL LOGIC DESCRIPTION
5.3 Heating Mode
Indoor fan running rules:
In s
everal minutes
after
t
he heati
ng mo
de is
started,
th
e fa
n of
th
e indoor unit will not run until
the heat exchanger of the indoor unit reaches a high enough temperature. That is because
cold air prevention system is operating. After several minutes, the speed can be selected as
high, (medium), low and auto.
The auto fan:
T1 is indoor room temperature. Ts is setting temperature.
DC-Inverter outdoor unit
：
Outdoor fan running rules:
Once the outdoor fan start up, it will follow the below rules:
Single outdoor fan: First, it will run in an invariable speed f
or a short time; Then it will regulate
the speed by the indoor-c
oil temperature.
Double outdoor fan: If it has
two outdoor fans, the upper fan regulates the speed by the rul
es,
and the downer fan speed lower than the upper fan speed for 30r
pm~60rpm.
Ts-T1
0
2
4
Low
Medium
High
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