12-17
CONTROL SYSTEM
SM CKDDCI 2-A.3 GB
12.4.10 Indoor Unit Dry Contact
Indoor unit Dry contact has two alternative functions that are selected by J9 (Dip-Switch).
Function
Contact = Open
Contact = Short
Presence Detector Connection
No action – normal operation (Default)
Forced to STBY
“Presence Detector” feature in the indoor unit is done for cases that external SB (Stand-By) is
required via a presence detector switch, window closed detector, etc.
12.4.11
On Unit Controls and Indicator
Indications during OFF, Fan, Cool, Heat, Dry, and Auto modes are shown below. For operation
in other modes, check the relevant paragraphs.
STANDBY
INDICATOR
Lights up when the Air Conditioner is connected to power and is ready for operation
OPERATE
INDICATOR
1. Lights up during operation.
2. Blinks for 300 msec to announce that a R/C infrared signal has been received
and stored.
3. Blinks continuously during protections (according to the relevant spec section).
TIMER INDICATOR
Lights up during Timer and Sleep operation.
COOLING
INDICATOR
Lights up when system is switched to Cool Mode by using the Mode Switch on the
unit.
HEATING
INDICATOR
Lights up when system is switched to Heat Mode by using the Mode Switch on the
unit.
Mode SWITCH
(COOL/HEAT/OFF)
Every short pressing , the next operation mode is selected, in this order : SB
→
Cool Mode
→
Heat Mode
→
SB
→
…
In long pressing system enters diagnostic mode.
12.5 Run
Mode
Run mode is the default operation mode of the system. This is the standard operation mode that
is active in field application (at customer site).
System can go from run mode to other operation modes through keyboard or serial ports.
12.5.1 Mode
Setting
Mode defines the ODU operation mode. There are three possible operation modes:
1.
STBY – standby mode
2.
COOL - the unit operating at cooling cycle
3.
HEAT - the unit operating at heat pump cycle
SB mode can be set also by dry-contact.
12.5.1.1 ODU
Protections
There are 4 ODU protections:
Compressor overheating
Heat sink overheating
AC over current
DC Over current – not in 6HP unit
