Service manual

15-6
CONTROL SYSTEM > GC 24
SM HADDCI 1-A.2 GB
15.4.4 Auto Cool/Heat Mode
When in auto cool heat mode unit will automatically select between cool and heat mode
according to the difference between actual room temperature and user set point temperature
(ΔT).
Unit will switch from cool to heat when compressor is off for 3 minutes, and ΔT < -3.
Unit will switch from heat to cool when compressor is off for 5 minutes, and ΔT < -3.
15.4.5 Dry Mode
As long as room temperature is higher then the set point, indoor fan will work in low speed
and compressor will work between 0 and MaxNLOADIF1C Hz.
When the room temperature is lower than the set point, compressor will be switched OFF and
indoor fan will cycle 3 minutes OFF, 1 minute ON.
15.4.6 Indoor Units Operation when Indoor Unit Mode is Different than Outdoor
Unit Mode
 Open louvers according to user selection.
 Indoor fan is forced to OFF.
15.4.7 Heating Element Control
Heating element can be lit on if LOAD > 0.8 * MaximumNLOAD AND Indoor Coil temperature
< 45C.
The heating element will be off when LOAD < 0.5 * MaximumNLOAD OR if Indoor Coil
temperature > 50C.
15.4.8 Ionizer Control
WNG Family - Ionizer is on when unit is on AND indoor fan is on AND Ioniser power switch
(on Ioniser) is on.
15.4.9 Indoor Unit Dry Contact
Indoor unit Dry contact has two alternative functions that are selected by J8.
Status Function Contact = Open Contact = Short
J8 = Open
Presence Detector
Connection
No Limit Forced to STBY
J8 = Short Power Shedding Function No Limit Limit NLOAD
15.4.10 Operating the Unit from the Mode Button
Forced operation allows to start, stop and operate in Cooling or Heating, in pre-set temperature
according to the following table:
Forced operation Mode Pre-set Temperature
Cooling 20
0
C
Heating 28
0
C
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