11-8
CONTROL SYSTEM
SM HDDHED 1-A.1 GB
11.11.5
Outdoor Coil Deicing Protection
This protection is for Heat Pump Only
This protection is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor
heat exchanger temperature must be more than its setting values when finishing the deicing
protection.
In the deicing protection, IFAN is forced OFF.
11.11.5.1 Deicing Starting Conditions
The starting conditions must be made with the outdoor air temperature (OAT) and outdoor coil
temperature (OCT). Under the conditions that the system is in heating operation, 6 minutes after
the compressor is started and more than 44 minutes of accumulated time pass since the start of
the operation or ending the defrosting.
Deicing interval time is changed as a function of deicing time. If deicing time is shorter than former
deicing time, the deicing interval time will be increased. If deicing time is longer than former deicing
time, the deicing interval time will be decreased.
11.11.5.2 Deicing Protection Procedure
11.11.5.3 Exiting
Deicing
System will exit the deicing until OCT reaches to certain value (depends on OAT) or the deicing
time >10mins.
11.12
Operating the Unit from the ON/OFF Button
The ON/OFF button allows to operate the unit in AUTO mode, the microcomputer will monitor the
room temperature and select the (COOL, HEAT, FAN) mode automatically, and temperature/Fan
speed settings can not be changed.
