Trane RAUJ-C20, Installation, Operation And Maintenance Manual

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11. At the Discharge Air Controller, use a digital
voltmeter to verify there is 24 volts AC across
terminals TR & TR.
12. Set the “Setpoint F” dial at 64°F; within 10 seconds,
the LEDs should turn “Off” as the cooling outputs
stage “Off”.
13. Immediately readjust the “Setpoint F” dial to 56°F;
the LEDs should begin to illuminate again as the
cooling outputs stage “On”.
If the unit includes the zone reset option, proceed to
the next step; if not, proceed to step 18.
14. Set the “Reset F” dial at 15°F and the “Setpoint F”
dial at 41°F; then remove the jumper across
terminals 6 & 7.
To simulate a call for maximum reset, install the
1780 ohm resistor (red leads), from the test kit,
across terminals 6 and 7. The cooling LEDs should
remain lit.
15. Turn the “Setpoint F” dial to 49°F; within 1 to 2
minutes, the LEDs should turn “Off” as the cooling
outputs stage “Off”.
16. As soon as all of the cooling LEDs are “Off”,
remove the 1780 ohm resistor from terminals 6 and
7 and re-install the jumper across these terminals.
17. Adjust the “Setpoint F” dial to 56°F; within 1
minute, the LEDs should illuminate as the cooling
outputs stage “On”.
If the system includes an economizer, complete
steps 18 through 23 to verify proper economizer
control operation; if not, proceed to step 24.
18. With all of the cooling LEDs “On”, measure the DC
voltage across terminals R (-) and W (+). The
measured voltage should be 1.7 VDC to 2.1 VDC.
19. Set the “Setpoint F” dial at 64°F to drive the
economizer output to the minimum position.
a. Within 2 minutes, the LEDs should turn “Off” as
the cooling outputs stage “Off”.
b. In approximately 5 minutes; measure the
voltage across terminals R (-) & W (+). The
measured voltage should drop to approximately
0.2 VDC.
20. Turn the control circuit switch 1S2, in the unit
control panel, and the main power disconnect
switch to the “OFF” position.
21. Remove the wires from terminals R, B, W, & Y.
22. Measure the resistance across the following pairs of
terminals, and compare the actual resistance
readings with the values shown below.
W7100 Terminals Resistance (ohms)
R-to-W 226
R-to-B 432
R-to-Y 226
23. Reconnect the economizer leads R, B, W, & Y to the
appropriate terminals on the controller.
24. Turn the control circuit switch 1S2, in the unit
control panel, and the main power disconnect
switch to the “OFF” position.
25. Remove the jumper, installed in step 5, from
terminals 6 & 7.
26. Remove the 3,400 ohm resistor from terminals T &
T1 and reconnect the discharge air sensor leads to
terminals T & T1.
27. Remove the “Test Plug” from the W7100 test socket
and reinstall the red dust cover.
28. Reconnect the field installed evaporator fan
auxiliary interlock wire to terminal board 7TB5
terminal 3.
29. Turn all control switches to the “On” position and
restore main power to the system.
P Prre e--S Stta arrtt