Maximum Wire Lengths; Thermostat To Hvac Equipment; Remote Sensor To Programmable Thermostat - Trane Thermostats Installation And Operation Manual

Pre-Installation

Maximum Wire Lengths

Thermostat to HVAC Equipment

The thermostat may not function properly if the total resistance of any of the thermostat to HVAC
equipment wires exceeds 2.5 ohms.To ensure that wire length does not cause excess resistance,
refer to
long.
Table 1.
Copper wire size
22 AWG (0.33 mm
20 AWG (0.50 mm
18 AWG (0.75 mm

Remote Sensor to Programmable Thermostat

Because remote temperature sensors measure resistance, very long cable runs can cause slight
errors in the measurement. For the highest temperature reading accuracy, avoid exceeding the
maximum recommended wire lengths shown in
Table 2.
Copper wire size
22 AWG (0.33 mm
20 AWG (0.50 mm
18 AWG (0.75 mm
Note: For 22 AWG (0.33 mm
10
Table 1 and ensure that the wires from the thermostat to the HVAC equipment are not too
Maximum Thermostat to HVAC Equipment Wire Lengths
Maximum recommended wire length
2
) 150 ft (46 m)
2
) 240 ft (73 m)
2
) 385 ft (117 m)
Maximum Recommended Remote Sensor Wire Length
Maximum recommended remote
sensor wire length
2
) 1000 ft (300 m)
2
) 1500 ft (450 m)
2
) 2500 ft (750 m)
) copper wires, the rate of error can be up to 0.5 °F (0.3 °C) per 100 ,
2
which typically requires wire lengths in excess of 5000 ft (1500 m).
Table 2.
BAS-SVX36C-EN