Digital Scroll Control Board (Dsc) - Carrier 48/50PD05 User Manual

Digital Scroll Control Board (DSC)

The DSC board controls the compressor's capacity. (See Fig. 19
and Table 22.) It receives a 1- -5vdc signal from the AUX1 board
determined by the cooling algorithm.
DISPLAY
POINT DESCRIPTION
NAME
CTLR Digital Scroll Ctrl Pwr
Compressor Discharge Temperature (DTT)
CAPC Compressor Capacity
Load Control Power*
C.ALM Scroll Compressor Alarm
CMP .A Compressor A Feedback
Digital Scroll Unloader
* Voltage used for contacts M1 & M2, U1 & U2, and V1 & V2 (24 VAC used).
The DSC has direct control of the compressor and pulses a
solenoid unloader on and off to provide a specific capacity. The
discharge temperature thermistor (DTT) is monitored by the DSC
for compressor safety.
(light- -emitting diode) for diagnostics. See the troubleshooting
section for more details.
Fig. 19 - - Digital Scroll Controller (DSC)
Table 22 — DSC Connections
SENSOR
LOCATION
INPUTS
Discharge line
OUTPUTS
Compressor
section
52
The DSC is equipped with an LED
CONNECTION
TYPE OF I/O
PIN NUMBER
24 VAC 24VAC/24COM
86k thermistor T1/T2
1--- 5vdc C1/C2
19--- 250VAC L1/L2
Relay A1/A2
Relay M1/M2
Relay U1/U2
C08659