Johnson Controls SNC Series User Manual

Dimensions
Figure 3: SNC mounting dimensions, in. (mm)
Mounting the SNC for wall mount
applications
Use the holes in the three mounting clips for wall mount
applications. To mount the SNC on a vertical surface,
complete the following steps:
1. Pull the top mounting clip upwards to the extended
position.
2. Mark mounting hole locations on the wall using the
dimensions shown in Figure 3, or hold the bracket
against the wall and mark the hole locations through
the mounting clips. The screw holes on the SNC
accommodates M4 and #8 screws.
3. Drill holes in the wall based on the locations marked
in Step 2. Insert wall anchors for each hole if
necessary.
4. Hold the device in place, insert the screws through
the mounting clips and into the screw holes, and
then carefully tighten all screws.
Important: Do not overtighten the mounting
screws. If you overtighten the screws, you can
crack the mounting clips.
Mounting the SNC for DIN rail mount
applications
About this task:
To mount the DIN rail and the SNC, complete the
following steps:
1. Securely mount a 20.3 cm (8 in.) DIN rail in the
required space.
2. On the SNC, extend the two bottom mounting clips.
3. Hang the SNC on the DIN rail hooks on the back of
the SNC.
4. Press the DIN clips back into position to secure the
unit on the DIN rail.
Mounting the SNC in a panel
To mount the SNC in a panel, follow these requirements:
• Mount the panel in accordance with the manufacturer’s
instructions.
• Mount the SNC in the panel following the guidelines in
Location considerations.
Wiring overview
Power supply, network, and
communication connections
See Figure 1 and Figure 2 for the location of the power
supply terminal, FC Bus and SA Bus terminals, Ethernet
ports, and USB ports. All terminal blocks are removable
terminal blocks.
Power supply
Power the SNC with a 24 VAC power transformer. In North
America, use a Class 2, 24 VAC power supply with a 50
VA minimum output. Outside North America, use a 24
VAC SELV (safety extra-low voltage) transformer at the
appropriate rating. The minimum input voltage for the
SNC to operate properly is 20 VAC.
Use a dedicated power supply to the SNC only. Do not
connect any other loads to the power supply. Additional
loads may cause noise interference. Outputs must be
powered from a separate source when not using internal
power.
F4-SNC Installation Guide4

Johnson Controls SNC Series Specifications

General

Brand	Johnson Controls
Model	SNC Series
Category	Controller
Language	English