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Installation
unit, and
Table 30, p. 58
for AC conductor sizing
guidelines. Then check the following:
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not
designed or qualified to accept other types of
conductors.
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.
3. Make sure to check all loads and conductors for
grounds, shorts, and mis-wiring.
Table 30. AC conductors
Distance from Unit to Control
000-460 feet
461-732 feet
733-1000 feet
4. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
Transformer for Expansion
Module
When the expansion module is installed, a 115Vac primary
- 24Vac secondary - 75VA transformer is provided for
customer use. However, the 20T standard efficiency, 20T
high efficiency, and 25T standard efficiency units utilize this
transformer to power a compressor solenoid so the
available VA for customer use is limited to 70VA.
Controls using DC Analog Input/
Outputs
Before installing any connecting wiring between the unit
and components utilizing a DC analog input\output signal,
refer to the appropriate illustration in and
the electrical access locations provided on the unit and
Table 31, p. 58
for conductor sizing guidelines. Then check
the following:
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not
designed or qualified to accept other types of
conductors.
58
Recommended Wire Size
18 gauge
16 gauge
14 gauge
Figure 3, p. 19
for
1. Use standard copper conductor thermostat wire unless
otherwise specified.
2. Ensure that the wiring between the controls and the
unit termination point does not exceed two and a half
(2.5) ohms/conductor for the length of the run.
Note: Resistance in excess of 2.5 ohms per conductor can
cause deviations in the accuracy of the controls.
Table 31. DC conductors
Distance from Unit to Control
000-150 feet
151- 240 feet
241- 385 feet
386- 610 feet
611- 970 feet
3. Do not run the electrical wires transporting DC signals
in or around conduit housing high voltage wires. Units
wired for a BACnet® Communication, LonTalk®
communication Interface, or Modbus option which
utilizes a serial communication link must:
•
be 18 AWG shielded twisted pair cable (Belden 8760 or
equivalent).
•
not exceed 5,000 feet maximum for each link.
•
not pass between buildings.
Variable Air Volume System
Controls
Discharge Temperature Control
Changeover Contacts
These contacts are connected to the customer connection
1KF11 when daytime heating on Discharge Temperature
Control units with internal or external hydronic heat is
required. Daytime (occupied) heating switches the system
to a Zone Temperature Control type mode of operation.
Refer to the unit wiring diagram for the field connection
terminals in the unit control panel. The switch must be
rated at 12 ma @ 24 VDC minimum.
Remote Zone Sensor (BAYSENS073*)
This electronic analog sensor features remote zone
sensing and timed override with override cancellation. It is
used as the source for zone temperature control. Refer to
for the Temperature vs. Resistance coefficient.
Remote Zone Sensor (BAYSENS074*)
This electronic analog sensor features single setpoint
capability and timed override with override cancellation. It
is used with a Trane Integrated Comfort™ system. Refer to
for the Temperature vs. Resistance coefficient.
Recommended Wire Size
22 gauge
20 gauge
18 gauge
16 gauge
14 gauge
RT-SVX072D-EN
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