Digital Outputs - Johnson Controls NXA-FCU-01 Installation Manual

DIGITAL OUTPUTS

The digital outputs are located on terminal block J3 and are labeled DO1 -
DO5. The digital outputs shown in Figure 14 below must be wired as follows:
• DO1 must be wired to the Fan
• DO2 must be wired to the Cooling Increment or Cooling Stage 1
• DO3 must be wired to the Cooling Decrement or Cooling Stage 2
• DO4 must be wired to the Heating Increment or Heating Stage 1
• DO5 must be wired to the Heating Decrement or Heating Stage 2
J3
Figure 14. Digital Outputs.
NOTE 1:
NOTE 2:
FCU Controller
HOT DO5 DO4 HOT DO3 DO2 HOT
HEATING INC/HEATING STAGE 1
HEATING DEC /HEATING STAGE 2
Adding additional loads changes the requirements of the
transformer and affects the total VA rating of the trans-
former.
When terminating two wires to the same HOT terminal,
wire size can not exceed 18 AWG.
DO1
FAN
COOLING INC/COOLING STAGE 1
COOLING DEC/COOLING STAGE 2
Installation Guide
AO AGND
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