Carrier 48/50PD05 manual Modulation Board AUX1, AUX1 Connections

Modulation Board (AUX1)

The AUX1 board controls the compressor capacity and the indoor fan speed (See Fig. 18 and Table 21.) It outputs a 1-5vdc and a 2-10vdc signal to the DSC and VFD for capacity and fan speed, respectively. This board is also used as the LEN connection buss

for the ECB, therefore must be operational for the ECB to communicate.

IMPORTANT: The AUX1 board has an 8-position DIP switch (S1) that is factory set for its LEN address. All the switches must be in the off position except 4, 5 and 7 which are on (off is towards the center of the board). Do not change this setting.

48/50PD

C08658

Fig. 18 - Modulation Board (AUX1)

Table 21 — AUX1 Connections

DISPLAY	POINT DESCRIPTION		TYPE OF I/O	CONNECTION
NAME				PIN NUMBER
		OUTPUTS
	Input power from TRAN1		24 VAC	J1, 11	---12
CAPC	Compressor Capacity		1---5vdc	CH9
F.SPD	Commanded Fan Speed		2---10vdc	CH10
		COMMUNICATION
	Local Equipment Network (LEN)		communication	J9, 1	---3
	Local Equipment Network (LEN)		communication	J9, 1	---3

51