Modulation Board (Aux1) - Carrier 48/50PD05 User Manual

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
DISPLAY
NAME
Input power from TRAN1
CAPC Compressor Capacity
F.SPD Commanded Fan Speed
Local Equipment Network (LEN)
Local Equipment Network (LEN)
Fig. 18 - - Modulation Board (AUX1)
Table 21 — AUX1 Connections
POINT DESCRIPTION
OUTPUTS
COMMUNICATION
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.
TYPE OF I/O
24 VAC
1--- 5vdc
2--- 10vdc
communication
communication
51
C08658
CONNECTION
PIN NUMBER
J1, 11--- 12
CH9
CH10
J9, 1--- 3
J9, 1--- 3