Carrier 42HWG009 Technical Data & Service Manual page 27

(8) DST Interface
– According to input of selecting address configuration of indoor unit PCB, the one of
below functions is assigned.
Address configuration
– The applicable connector for these functions is CN18 of indoor unit PCB.
DST Interface
1) The DST(Dealer Service Tool) is an application program used to verify a defec-
tive control board in Air Conditioner
2) It can also be used to diagnose the fault before the board replacement.
3) To use DST function, first of all, following preparations are required.
– DST interface converter
– G-DST interconnection wire
– IBM PC 386DX-33 processor with MS Windows OS 3.1
( Minimum system requirement )
4) If there are any problems or questions relating to the operation or installation of
the DST please consult the 'Installation Guide and User's Manual'
(9) Emergency and Test Operation.
Emergency operation
– When the remote control is lost, damaged or the battery is discharged, the
Emergency operation can be able to run the unit.
– lf user wants Emergency operation, push the EMERG. button on the T/B cover of
the indoor unit.
– The unit is operated automatically by selecting Cooling or Heating Mode according
to the room temperature.
– lf user wants to stop the Emergency operation, push the EMERG. button again or
operate remote control.
– The setting conditions of Emergency operation are as follows.
• Operation mode :
AUTO (42HQG007/009/012/018/024, HWG195H/225H/305H/455H/605H)
COOL (42HWG007/009/012/018/024, HWG195C/225C/305C/455C/605C)
• Preset temperature:
25ºC (42HQG007/009/012/018/024, HWG195H/225H/305H/455H/605H)
24C (42HWG007/009/012/018/024, HWG195C/225C/305C/455C/605C)
A
B DST Interface not available
26
Functions
DST Interface available