Trane LPC, Install And Operation Instructions

Page: 35 / 110

LPC-SVX01C-EN 35
electrical
requirements
Unit Wiring Diagrams
Specific unit wiring diagrams are
provided on the inside of the control
panel door. Use these diagrams for
connections or trouble analysis.
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power,
including remote disconnects and
discharge all motor start/run
capacitors before servicing. Follow
proper lockout/tagout procedures to
ensure the power cannot be
inadvertently energized. Verify with an
appropriate voltmeter that all
capacitors have discharged. Failure to
disconnect power and discharge
capacitors before servicing could
result in death or serious injury.
Supply Power Wiring
It is the installer’s responsibility to provide
power supply wiring to the unit. Wiring
should conform to NEC and all applicable
code requirements. When units are
ordered without controls, the contractor
must also furnish an on/off switch,
thermostat, and a fused disconnect
switch in compliance with national and
local electrical codes.
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).
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to
accept other types of conductors.
Failure to use copper conductors may
result in equipment damage.
Caution
Motor Winding Damage!
Do not use a megohm meter or apply
voltage greater than 50 DVC to a
compressor motor winding while it is
under a deep vacuum. Voltage
sparkover may cause damage to the
motor windings.
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
AH540 controller,
avoid creating ground loops with
grounded conductors external to the unit
control circuit. Ground loops can affect
the measurement accuracy of the
controller.
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.
Installation
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 1 for the wire size range and
maximum wiring distance for each
device.
Power
The Tracer AH540 controller is powered
by 24VAC. Three pairs of two terminals
are provided for 24VAC connection to the
board.
Important 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
electrical 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.
Figure I-ER-1. Tracer AH540 Power Requirement
Termination board
Main controller board
Transformer
Line
voltage
24 Vac