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Thermodisc Switch 110 degree F Limit Control- (TDF110-20F)(80389)
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$34.99
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USSC 80389 thermo-disc 110 degree / 20 degree differential
Limit Control - Part # 80389
Temperature Range: Cut-in - 110º F Cut-out - 130ºF
20f Open to Rise
Therm-O-Disc Part Number 60T11-610044
DISTRIBUTION FAN
(1) HI-SPEED PT# 80389
ENERGIZES WHEN UNIT IS
FIRED AGGRESSIVELY ONLY.
80389
High Speed Thermo-disc for multiple brands including:
Jensen Stove
24AF, 24AG and 24AZ
Jensen US Stove 80389 High Speed Thermodisc 24A 24AF 24AJ Wood Furnace USSC
Wall mounted thermostat requests heat...electrical
contact occurs.
2.
Current is sent through relay, rheostat, 170 degrees
thermo limit disk to activate draft fan.
3.
Relay...electrical switching device,
Rheostat...current (voltage) reducer increases or de-
creases draft fan R.P.M.
170 degrees limit disk...breaks off electrical current at
170 degrees (limit disk)
Draft fan...small fan that activates fire, increasing fire
temperature.
4.
Upon firebox temperature rise due to air from draft
fan, distribution fan is activated at approximately 110
degrees air temperature, 600 CFM of air at 110 de-
grees.
5.
110 volts (main electrical line) is sent to left side of 140
degrees thermo disk (3 prongs) current passes through
140 degrees disk to 110 degrees disk. Current simply
waiting for 110 degrees so it can pass through and
activate normal speed function of distribution fan. (blue
wire)
6.
If 110 degrees firebox air temperature is not main-
tained snap disk terminates current to distribution fan.
Should firebox temperature air reach 140 degrees cur-
7.
rent is directed to activate high speed portion 1300
CFM of air. Current travel from prong 1 to prong 2 on
140 degrees disk to activate high speed portion (black
wire).
Distribution Capacitor: Reduces amps required to ac-
8.
tivate distribution fan.
Varistor: Provides even flow of current to snap disk,
9.
prevents electrical surges, provides longer life of snap
disk.
Transformer: Reduces voltage 110 volts to 12 volts for
10.
thermostat usage. Generally hums a bit.
The above is somewhat basic, however, it's offered so you
can understand your furnaces electrical functions and en-
joy it more.
USSC