Trane DFOA - Trouble Shooting; MDT;MRT Controls; Table 13. Resistance Lookup for RTC

66 Direct-Fired Make-up Air • MUA-SVX01A-EN
Trouble Shooting
Section 4
4. With proper voltages observed thus far, and modulator responding correctly,
wire the system (Wire 1 diagram) with exception to -connect the discharge air
sensor in place of the jumper.
5. Set the MIN temperature selector on the amplifier at least 10°F above the
outdoor temperature.
6. Set the MAX temperature selector on the amplifier at mid-range. Heater is
now controlled by the discharge air monitor.
Turn test potentiometer to maximum resistance. Delivered air temperature
should be per MAX temperature setting. Turn test poteniometer to minimum
resistance. Delivered air temperature should be per MIN temperature setting. If
proper delivered air temperatures are observed, the problem is identified with
the space temperature sensing and/or temperature selecting components and
circuits. See trouble shooting section. If proper delivered air temperatures are
not observed, check calibration.
Table 13. Resistance Lookup for RTC
Temp °F Temp °C
Sensor
Resistan
ce
Dial Range
40-90
Std.
80-130
Service
Part
120-170
Spec.
Parts
160-210
Spec.
Parts
200-250
Spec.
Parts
40 4.4 11214 11250
50 10.0 11029 11050
60 15.6 10835 10850
70 21.1 10635 10650
80 26.7 10429 10450 10380
90 32.2 10219 10250 10180
100 37.8 10005 9980
110 43.3 9789 9780
120 48.9 9573 9580 9590
130 54.4 9356 9380 9390
140 60.0 9142 9190
150 65.6 8930 8990
160 71.1 8723 8790 8700
170 76.7 8521 8590 8500
180 82.2 8325 8300
190 87.8 8138 8100
200 93.3 7959 7900 8060
210 98.9 7791
7700 7860
220 104.4 7634
7660
230 110.0 7490
7460
240 115.6 7360
7260
250 121.1 7246
7060
MDT/MRT Controls