Carrier 48/50PD05 manual Digital Scroll Control Board DSC

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.

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.

48/50PD

					C08659
	Fig. 19 - Digital Scroll Controller (DSC)
	Table 22 — DSC Connections
DISPLAY	POINT DESCRIPTION		SENSOR	TYPE OF I/O	CONNECTION
NAME			LOCATION		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/C2
	Load Control Power*			19---250VAC	L1/L2
		OUTPUTS
C.ALM	Scroll Compressor Alarm			Relay	A1/A2
CMP.A	Compressor A Feedback			Relay	M1/M2
	Digital Scroll Unloader		Compressor	Relay	U1/U2
			section

* Voltage used for contacts M1 & M2, U1 & U2, and V1 & V2 (24 VAC used).

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