Commander Ductable Make-Up Air Heater
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Owner’s Manual •
Commander Ductable Make-Up Air Heater
20
7. Check for electrical continuity across the switch
terminals to make sure the contacts have closed.
FIG. 10
Temperature Sensor Probe
The temperature sensor probe is mounted behind the
discharged air louver panel. To test or replace it, perform
the following instructions:
1. If a duct is attached to the discharge ring, disconnect the
duct from the discharge ring.
2. Remove the 12 outer screws securing the ring discharge
panel to the heater. See Fig. 11.
3. Remove the ring discharge panel.
4. Remove the two screws holding the temperature sensor
probe mounting bracket.
FIG. 11
5. Lower the mounting bracket and loosen the two screws
to remove the wires from the temperature sensor probe.
6. Remove the two screws securing the sensor probe to the
mounting bracket.
RESET BUTTON
TERMINAL
SENSING
SURFACE
MOUNTING
LEGS
7. Measure the Ohm resistance across the temp. sen-
sor probe screws as shown in Fig. 12.
8. Compare the reading to the Ohm reading in table 1.
If resistance is different than shown in table, replace
the sensor probe.
9. The probe should be cleaned annually with a dry
clean rag and compressed air.
FIG. 12
Temp °F
Temp °C
Resistance (Ω)
40
4.4
11210
50
10.0
11020
60
15.6
10826
70
21.1
10630
80
26.7
10433
90
32.2
10234
100
37.8
10034
110
43.3
9830
120
48.9
9624
130
54.4
9413
140
60.0
9199
150
65.5
8983
160
71.1
8766
170
76.7
8550
180
82.2
8337
190
87.8
8130
Table 1
