4: Option Boards; Ca-2 Chassis Assembly - Honeywell NOTIFIER NCA-2 Instruction Manual

Installation
3.5.4 Option Boards
If installing option boards on the CHS-M3, connect
them at this time. As described in Section 3.5.1 "Lay-
out", up to eight option boards can be mounted in CHS-
M3 to the right of the NCA-2.
There are no slots in the first (back) two layers, but
option boards with tabs (such as NCM-W) will still fit
in those positions.
Mounting Procedures
1. Install four 1 inch (25.4 mm) female stand-offs
onto the chassis (P/N 42040, included with
chassis) as shown in Figure 3.6.
2. Place the first option board over the stand-offs so
that holes line up.
3. If no more option boards will be mounted in that
position, securely fasten all stand-offs with screws
(provided with module). If mounting a second or
third option board, attach another layer of stand-
offs and repeat steps 2-3. Note: Set the switches
on an option board before mounting another layer
in front of it.
4. For the top (fourth) layer of option boards, slide
the tab at the bottom of the board into the slots on
the chassis, and lay the board back onto the top of
the chassis so that the studs line up with mounting
holes on the option board. Securely fasten all stand-offs with screws provided with module.

3.6 CA-2 Chassis Assembly

The NCA-2 will mount into a CA-2 chassis assembly - along with a DVC-
EM, microphone and optional telephone handset - as part of an audio com-
mand center installation.
The CA-2 is a two-row assembly consisting of
• a back plate that attaches to the backbox
• two half-chassis, each of which takes up the left half of a backbox row
• a microphone and telephone handset well
• a microphone.
The NCA-2 mounts in the upper left corner. (Refer to Figure 3.7 and
Figure 3.8.) Mount the NCA-2 to its half-chassis without removing the half-
chassis from the back plate. Refer to "Memory-Backup Battery" on page 23
for removal of insulator.
24
Attach stand-offs for
option boards here...
When applicable, slide tabs at
bottom of option boards here...
Figure 3.6 Mounting Option Boards in CHS-M3
NCA-2 half-
chassis
DVC half-
chassis
Figure 3.7 CA-2 Chassis Assembly
CA-2 Chassis Assembly
...and here
Back plate
NCA-2 Manual — P/N 52482:M5 03/20/2019
...and here
Microphone
and
handset
well