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
