Chapter 2 BCU Mounting and Power Wiring
28 BMTW-SVN01F-EN
• The left clearance allows for the alternate entry of conduit for the
120/240 Vac power entry.
• The right clearance allows for entry of conduit for low-voltage commu-
nication links and input/output wiring.
• The front clearance allows for operation and service access.
Secure the BCU to the Wall
After the installing contractor runs ac-power wiring, input wiring, and
communications wiring to the selected location, secure the BCU to the
wall:
1. Unpack the BCU shipping carton. The keys for the BCU are inside
the resin cover.
2. To avoid damage to the BCU logic board and resin front cover, store
them at another location during building construction.
3. On the wall, mark the location of the four mounting holes in the BCU
back panel.
4. Set the back panel aside and drill the mounting holes.
5. Secure the back panel to the wall with the M6 (
¼ in.) hardware.
Install the Optional Operator Display
If you purchased the optional BCU operator display, refer to “Installing
the Optional Operator Display” on page 33, then proceed to “BCU Power
Wiring for International Installations” below.
BCU Power Wiring for International Installations
The BCU power wiring procedure consists of verifying compliance with
the BCU circuit requirements and then connecting the ac-power wires.
(See also “Preliminary AC-Power Checkout” on page 30.)
Verify Compliance with Circuit Requirements
To make sure that the BCU will operate properly, verify that the power
supply circuit is in compliance with these circuit requirements:
• The BCU must receive power from a dedicated power circuit. Failure
to comply may cause control malfunctions.
• The ac-power wire conduits or wire bundles must not contain
input/output wires. Failure to comply may cause the BCU to malfunc-
tion due to electrical noise.
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