12-6
CONTROL SYSTEM
SM OU12HP 2-E.2 GB
12.4.4 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
(T).
Unit will switch from cool to heat when compressor is off for 3 minutes, and T < -3.
Unit will switch from heat to cool when compressor is off for 5 minutes, and T < -3.
12.4.5 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 maximum frequency in cooling.
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.
12.4.6 Heating Element Control
Heating element can be turn on if high LOAD is more then 80% and Indoor Coil temperature
is less then 45qC.
The heating element will be off when LOAD is less then 50% OR if Indoor Coil temperature is
more then 50qC.
12.4.7 Indoor Unit Dry Contact
“Presence Detector” feature in the indoor unit is done for cases that external SB (Stand-By) is
required via a presence detector sensor or others such as window closed detector, etc.
The dry contact can be set to operate if the contacts are shorted as follows:
Function Contact = Open Contact = Short
Presence Detector Connection No Action – normal operation (Default) Forced to STBY
Notes:
o When the A/C is forced to STBY mode, all R/C commands are ignored, and the operation LED
blinks with 1 seconds cycle time.
o Any change in the Presence Detector state during the first 6 sec after the system reset is
ignored.
12.4.8 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
12.4.9 On Unit Controls and Indicators
Indications during OFF, Fan, Cool, Heat, Dry, and Auto modes are shown below. For operation
in other modes, check the relevant paragraphs.
To Next Page
Loading...
