Digital Scroll Control Board (Dsc) - Carrier 50PD05 Operating And Service Instructions

Digital Scroll Control Board (DSC)
The DSC board controls the compressor's capacity. (See Fig. 19
and Table 22.) It receives a l-5vdc signal from the AUX1 board
determined by the cooling algorithm.
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. The DSC is equipped with an LED
(light-emitting diode) for diagnostics, See the troubleshooting
section for more details.
T3
R
.... CC
TI
C
T2
D4 D2 T6 T4 T2 P6 P4 P2 C4 C2 24 24 .,i Power LED
D3D1 T5T3T1 P5P3Pl C3C1 VACCOM {]_ (Green)
Unloader LED
Alert LED
(Red)
Fig. 19 - Digital Scroll Controller (DSC)
(08659
Table 22 -- DSC Connections
DISPLAY SENSOR CONNECTION
NAME POINT DESCRIPTION LOCATION TYPE OF I/O PIN NUMBER
INPUTS
CTLR Digital Scroll Ctrl Pwr 24 VAC 24VAC/24COM
Compressor Discharge Temperature (DTT) Discharge line 86k thermistor T1/T2
CAPC Compressor Capacity 1- 5vdc C1/O2
Load Control Power* 19-250VA0 L1/L2
OUTPUTS
C.ALM Scroll Compressor Alarm Relay A1/A2
CMRA Compressor A Feedback Relay M1/M2
Digital Scroll Unloader Compressor Relay U1/U2
section
Voltage used for contacts M1 & M2, U1 & U2, and VI & V2 (24 VAC used).
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