Wall-Mounted Control Interconnection Wiring - Trane UniTrane Installation, Operation And Maintenance Instructions

Installation—Electrical
NOTICE
Equipment Damage!
Unit transformer IT1 provides power to fan-coil unit only. Field connections to the transformer
IT1 may create immediate or premature unit component failure.
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.

Wall-Mounted Control Interconnection Wiring

The installer must provide interconnection wiring to connect wall-mounted devices such as a fan
mode switch or 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 3.
Device
Fan Speed Switch
Zone Sensor
Recommendation: Do not bundle or run interconnection wiring in parallel with or in the same
conduit with any high-voltage wires (110 V 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.
Note: Do not connect any sensor or input circuit to an external ground connection.
Table 4.
Size
03
04
06
Note: Actual rpm will vary with application and configuration
Table 5.
Note: Fractional HP (kW) values are approximate values and not necessarily actual HP (kW).
60
Table 3 for the wire size range and maximum wiring distance for each device.
Maximum wiring distances for low voltage controls (ft)
Wire Size
14–22 AWG
16–22 AWG
Low vertical free-discharge motors, 115 volt
FLA HP (kW)
0.7 0.03 (0)
0.8 0.03 (0)
1.1 0.03 (0)
Decimal to fractional HP (kW) conversion
FC Decimal
02
03
Range
500
200
RPM
H 1090
M 770
L 560
H 1090
M 750
L 560
H 1115
M 760
L 560
Fraction
0.03 1/30
0.07 1/15
0.04 1/25
0.05 1/20
0.08 1/12
UNT-SVX07B-EN