Measuring Output Resistance; Display Sensors; All Models Other Than The Display Sensor - Trane Wired Temperature Sensors Installation, Operation And Maintenance Manual

Maintenance and Troubleshooting

Measuring Output Resistance

Measure output resistance as follows, according to sensor type.

Display Sensors

For display sensors, measure the outputs for zone temperature, setpoints, heat setpoint, and
system/fan mode as described:
1. Ensure that the GROUND (terminal 10) and the SIGNAL COMMON (terminal 2) wires are
2. To measure zone temperature resistance, disconnect the ZONE TEMP (terminal 1) wire from the
3. To measure setpoint resistance:
4. To measure the system/fan mode resistance, disconnect the SYS/FAN MODE (terminal 4) wire
Notice:
Potential Equipment Damage!
Because the output circuits are not electrically powered, resistance can be measured without
risk of damage to the volt-ohm meter. However, damage to the volt-ohm meter could potentially
result if terminal 11 (24 VAC/VDC) is inadvertently contacted.

All Models Other Than the Display Sensor

For all other wired sensors, measure the outputs for temperature and setpoints and, if applicable,
the system/fan mode and heat setpoint:
1. To measure zone temperature resistance, measure between SIGNAL COMMON (terminal 2)
2. To measure setpoint resistance:
3. To measure the system/fan mode resistance, measure between SIGNAL COMMON (terminal 2)
30
grounded to the transformer.
sensor. Measure between the ZONE TEMP (terminal 1) and SIGNAL COMMON (terminal 2).
Compare resistance measurements to those in
• For single setpoint systems, disconnect the SETPOINT (terminal 3) wire from the sensor.
Measure between the SETPOINT (terminal 3) and the SIGNAL COMMON (terminal 2).
Compare resistance measurements to those in
• For dual setpoints systems, disconnect the HEAT SETPOINT (terminal 5) wire from the
sensor. Measure between the HEAT SETPOINT (terminal 5) and the SIGNAL COMMON
(terminal 2). Compare resistance measurements to those in
from the sensor. Measure between the SYS/FAN MODE (terminal 4) and the SIGNAL COMMON
(terminal 2). Compare resistance measurements to those in
and ZONE TEMP (terminal 1). Compare resistance measurements to those in
• For single setpoint systems, measure between SIGNAL COMMON (terminal 2) and
SETPOINT (terminal 3).
• For dual setpoint system, measure between SIGNAL COMMON (terminal 2) and CSP
(terminal 3), and between SIGNAL COMMON (terminal 2) and HSP (terminal 5).
Compare resistance measurements to those in
and MODE (SYS/FAN SWITCH) (terminal 4). Compare resistance measurements to those in
Table 2.
Note: The output circuits are not electrically powered; consequently, resistance can be
measured without risk of damage to the volt-ohm meter.
Table 1.
Table 1.
Table 1.
Table 2.
Table 1.
Table 1.
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