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Unit Wiring Diagrams
Specific unit wiring diagrams are
provided on the inside of the control
panel door. Typical unit wiring diagrams
are in the Maintenance section on pages
58–69. Use these diagrams for
connections or trouble analysis.
Supply Power Wiring
It is the installer's responsibility to provide
power supply wiring to the unit terminal
block or the non-fused disconnect switch
option. Wiring should conform to NEC and
all applicable code requirements.
Bring supply wiring through the knockout
in the unit control box. Connect the three
phase wires to the power terminal block
or the non-fused disconnect switch in the
control box terminals. Refer to specific
wiring diagrams and fuse information in
the unit's control panel.
Refer to unit specific wiring diagrams for
specific wiring connections. Locate unit
wiring diagrams on the inside of the
control box cover. Refer to the unit
nameplate for unit specific electrical
information, such as voltage, minimum
circuit ampacity (MCA), and maximum
fuse size (MFS).
WARNING
Hazardous Voltage!
Before servicing unit disconnect all
electrical power including remote
disconnects. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to disconnect power before
servicing can cause death or serious
injury.
CAUTION
Use copper conductors only!
Unit terminals are not designed to
accept other conductor types. Failure to
use copper conductors may cause
equipment damage.
20
Installation
CAUTION
Correct phase critical!
Correct phase sequence is critical. If
phase sequence of the incoming line
voltage is not correct, it may cause
motor damage.
Electrical Connections
Units have one of three different
connection points, depending on the unit
type and options.
1. If the unit has no controls: power and
ground are tucked inside of the handy
box.
2. If the unit has a control interface or
Tracer ZN controller: power and ground
are inside the control box. If the unit has
a control interface or a Tracer controller,
the power wires and ground wire are
inside the control box connected to a
non fused disconnect switch.
3. If the unit has a electric heat: power
and ground connections are inside the
electric heat control box, connected to a
non-fused disconnect switch or terminal
block.
Electrical Grounding
Restrictions
All sensor and input circuits are normally
at or near ground (common) potential.
When wiring sensors and other input
™
devices to the Tracer
ZN controller,
avoid creating ground loops with
grounded conductors external to the unit
control circuit. Ground loops can affect
the measurement accuracy of the
controller.
Note: Unit transformer IT1 provides
power to the blower coil unit only and is
not intended for field connections. Field
connections to the transformer IT1 may
cause immediate or premature unit
component failure.
Electrical
Requirements
All input/output circuits (except isolated
relay contacts and optically isolated
inputs) assume a grounded source,
either a ground wire at the supply
transformer to control panel chassis, or
an installer supplied ground.
Note: Do not connect any sensor or
input circuit to an external ground
connection.
The installer must provide interconnec-
tion wiring to connect wall mounted
devices such as a zone sensor module.
Refer to the unit wiring schematic for
specific wiring details and point-to-point
wiring connections. Dashed lines indicate
field wiring on the unit wiring schematics.
All interconnection wiring must conform
to NEC Class 2 wiring requirements and
any state and local requirements. Refer
to Table I-ER-1 for the wire size range and
maximum wiring distance for each
device.
Recommendation: Do not bundle or run
interconnection wiring in parallel with or
in the same conduit with any high-
voltage wires (110V or greater).
Exposure of interconnection wiring to
high voltage wiring, inductive loads, or
RF transmitters may cause radio
frequency interference (RFI). In addition,
improper separation may cause electri-
cal noise problems. Therefore, use
shielded wire (Beldon 83559/83562 or
equivalent) in applications that require a
high degree of noise immunity. Connect
the shield to the chassis ground and
tape at the other end.
Table I-ER-1. Zone Sensor Maximum Wiring
Distances, ft (m)
Wire Size Range
Max. Wiring Distance
16 - 22 AWG
200 (60.96)
BCXC-SVX01A-EN
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