Field Installed Control Wiring; Control Power Transformer; Controls Using 24 Vac - Trane TSC037E Installation, Operation And Maintenance Manual

Installation
disconnect switch (UDC) or circuit breaker (UCB). If neither
a factory mounted non-fused disconnect switch (UDC) or
circuit breaker (UCB) was factory mounted, field wiring
connections should be terminated in the control box at
Compressor Contactor # 1 (CC1).
Provide proper grounding for the unit in accordance with
local and national codes.
Note: Black Gasket is shipped from the factory and is
located in the literature ShipWith bag in the control
box. Apply Black Gasket around conduit plate on all
4 sides after installation to prevent air leakage from
the building entering the electrical enclosures.
Note: Seal between wiring and conduit with Black Gasket
or weather proof sealer to prevent air leakage from
the building entering the electrical enclosures.Also
seal around conduit and wiring at all roof and curb
penetrations.
Figure 36. All units except 10 ton high efficiency with
hot gas reheat dehumidification.
Figure 37. 10 ton high efficiency
SEAL BETWEEN
WIRING AND
CONDUIT WITH
WEATHER PROOF
SEALER TO PREVENT
AIR LEAKAGE
FIELD POWERED
CONVENIENCE OUTLET
CONTROL WIRING
CONDUIT
CONDUIT
CONTROL WIRING
CONDUIT
BLACK GASKET
32

Field Installed Control Wiring

An overall layout of the various control options available
with the required number of conductors for each control
device is illustrated in Figure 52, p.

Control Power Transformer

The 24 volt control power transformers are to be used only
with the accessories called out in this manual.
Transformers rated greater than 50 VA are equipped with
internal circuit breakers. If a circuit breaker trips, turn "Off"
all power to the unit before attempting to reset it.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
The transformer is located in the control panel.The circuit
breaker is located on the left side of the transformer and
can be reset by pressing in on the black reset button.

Controls using 24 VAC

Before installing any connecting wiring, refer to
Dimensions, " p. 14 for the electrical access locations
provided on the unit and Table 5, p. 32
AC conductor sizing guidelines, and;
1. Use copper conductors unless otherwise specified.
2. Ensure that the AC control wiring between the controls
and the unit's termination point does not exceed three
(3) ohms/conductor for the length of the run.
Note: Resistance in excess of 3 ohms per conductor may
cause component failure due to insufficient AC
voltage supply.
Note: Be sure to check all loads and conductors for
grounds, shorts, and mis-wiring.
3. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
4. Route low voltage wiring per illustrations on page 34.
Table 5. Electromechanical thermostat 24V AC
conductors with ReliaTel™ units
Distance from Unit to
Control
000 - 460 feet
000 - 140 m
461 - 732 feet
141 - 223 m
733 - 1000 feet
224 - 305 m
39.
"Unit
or Table 6, p. 33
Recommended Wire Size
18 gauge
.75 mm2
16 gauge
1.3 mm2
14 gauge
2.0 mm2
RT-SVX22M-EN
for