Wiring Connections; Power Connections - Johnson Controls NXA-FCU-01 Installation Manual

WIRING CONNECTIONS

POWER CONNECTIONS


Use a UL listed Class 2 power transformer supplying a nominal 24 VAC (+/-
10%). The supply to the transformer must be provided with a breaker or
disconnect.
NOTE: The UL
power multiple UL
that the transformer is properly sized to power all equipment
simultaneously.
WHEN POWERING MULTIPLE UL
FROM THE SAME CLASS 2 POWER TRANSFORMER, POLAR-
ITY MUST BE OBSERVED (24VAC HOT CONNECTED TO
24VAC HOT AND 24VAC NEUTRAL CONNECTED TO 24VAC
NEUTRAL).
DO NOT GROUND THE SECONDARY OF THE POWER TRANS-
FORMER. THE TRANSFORMER FRAME MUST BE GROUNDED.
The power connections to the FCU-01 are shown in Figure 3. To connect
power to the FCU-01:
1. Connect the Hot wire of the transformer to the HOT terminal on
the FCU-01 board.
2. Connect the Neutral wire of the transformer to the NEU terminal
on the FCU-01 board.
3. Connect the GND terminal on the FCU-01 board to a properly
grounded metal chassis.
FCU Controller

listed Class 2 power transformer may be used to

listed Class 2 powered devices provided
    
LISTED CLASS 2 DEVICES
Installation Guide
9