Classic Agricultural Animal Confinement Building Heaters
www.lbwhite.com
Owner’s Manual • Classic
24
FIG. 38
Manual Reset High
Limit Switch
This heater uses a high limit heat switch for the
purpose of over heat protection. The high limit switch is
located on the heat chamber, see Fig. 39 (Classic 60)
or Fig. 40 (Classic 115.)
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.
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
mounting legs, apply a small
fl
ame only to the sens-
ing portion on the back of the switch. See Fig. 41.
Do not melt the plastic housing of the switch when
conducting this test.
2. Within a minute, you should hear the contacts of the
switch opening. Check for lack of electrical continu-
ity across the switch terminals to verify contacts
have opened.
3. Allow the switch cool down for about a minute before
fi
rmly pressing the red reset button on the switch.
4. Check for electrical continuity across the switch
terminals to make sure the contacts have closed.
5. Reinstall the switch back into the heater. Reconnect
the heater to its electrical supply. Start the heater
and check for proper operation.
WARNING
Fire Hazard
■
Do not operate the heater with the high limit
switch bypassed.
■
Operating the heater a bypass high limit switch
may lead to overheating, possibly resulting in
a
fi
re, with subsequent damage to the heater,
building damage, or loss of livestock.
FIG. 39
FIG. 40
FIG. 41
RESET BUTTON
SENSING
SURFACE
TERMINAL
FLAME
MOUNTING
LEG
GASKET
BURNER RIBS
HIGH LIMIT
SWITCH
HIGH LIMIT SWITCH
