Heat Mode - Airwell CADE024 Service Manual

11.4

Heat Mode

If Load >0, the unit will operate in heating mode. The compressor, outdoor fan and 4-way valve will
operate and the indoor fan will delay 1'30" to start at the latest
If LoadAT≤0, the compressor will stop operation and the outdoor fan will delay 60 seconds to stop.
And the indoor fan will blow for 60s at low fan speed for cassette and fl oor ceiling model and at
setting fan speed for duct model. During this period, the fan speed can't be switched.
11.4.1 Indoor Fan Control in Heat Mode
Indoor fan speed depends on the indoor coil temperature
Anti-cold air function
When starting the heating mode, anti-cold air function will be activated and indoor fan can run at low
speed or stop running. This function will terminate after the unit runs for 1.5min.
Residual heat blowing function
During heating, when the stopping condition for the compressor is reached. The indoor fan will blow
for 60s at low fan speed for fl oor ceiling model and at setting fan speed for duct model. For cassette
unit the indoor fan will operate continuously in low fan speed until compressor restarting.
During this period, the fan speed can't be switched.
For manual OFF condition, the residual heat blowing function will last 60s for all indoor models.
11.5 Auto Cool/Heat Mode
In AUTO mode, the system selects the running mode (COOL/HEAT/FAN) automatically according to
the room temperature. The display shows the actual running mode and setting temperature. There
will be 30s delay for mode conversion.
1. When RAT≥26 degree, the cooling mode is selected.
2. When RAT≤20 degree, the unit runs in heating mode
3. When 20 degree <RAT< 26 degree, upon initial startup, the unit will enter auto mode and run in
automatic fan mode. If the other mode changes into auto mode, the previous running mode will remain.
11—CONTROL SYSTEM
SM YUDE 1-A.1 GB | 11—5