Guardian Brood Heaters
Owner’s Manual • Guardian
19
Manual Reset High Limit
Switch
WARNING
Fire Hazard
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limit switch bypassed.
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limit switch may lead to overheating, possibly
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the brood heater, building damage, or loss of
livestock.
This brood heater uses a high limit heat switch for
the purpose of over heat protection. It is connected
between the ignition control and the gas control
valve.
The switch has normally closed contacts. If an over-
heat condition occurs, the switch contacts will open,
thereby opening the circuit to the gas control valve.
Model AD060/AD100/AD250: The high limit switch is
located on the heat chamber, See Fig. 13a and 13b.
ModelAD325: The high limit switch is located on
the fan housing side panel at the motor end of the
heater. See Fig. 14a and 14b.
FIG. 13a
FIG. 13b
HIGH LIMIT SWITCH
(AD100/AD250)
FIG. 14a
FIG. 14b
The high limit switch should be tested a minimum of
once per year when the heater is given a thorough
cleaning.
1. Remove the switch. Holding the switch by one of its
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-
ing portion on the back of the switch. See Fig. 15.
Do not melt the plastic housing of the switch when
conducting this test.
2. Within a minute, you should hear a pop coming
from the switch, which indicates the contacts of the
switch have opened. Check for lack of electrical
continuity across the switch terminals to verify
contacts have opened.
SWITCH
(AD325)
SWITCH
(AD060)
REMOVE COVER
Summary of Contents for AD060
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Page 38: ...Guardian Brood Heaters www lbwhite com Owner s Manual Guardian 38 Notes...
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