Trane LO Electrical Grounding Restrictions Wall Mounted, Control Interconnection Wiring, Device

Electrical

Grounding

Restrictions

Wall Mounted

Control

Interconnection

Wiring

All sensor and input circuits are normally at or near ground (common) potential. When wiring sensors and other input devices to the Tracer® ZN.010, ZN.510, ZN.520 or TUC, avoid creating ground loops with grounded conductors external to the unit control circuit. Ground loops can affect the measurement accuracy of the controller.

!CAUTION: 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.

Note: Do not connect any sensor or input circuit to an external ground connection.

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 require- ments. Refer to Table 3 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 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.

Table 3. Maximum Wiring Distances, ft (m)

Device	Wire Size Range
Max. Wiring Distance
Fan Mode Switch	14 - 22 AWG
500 (152.4)
Zone Sensor Module	16 - 22 AWG
200 (60.96)

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