Manual Reset High Limit Switch; Fire Hazard - L.B. White 346 Manuel De L'utilisateur

FIG. 38
Manual Reset High
Limit Switch
■ 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 fire, with subsequent damage to the heater,
building damage, or loss of livestock.
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
E
mounting legs, apply a small flame 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
firmly 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.
Classic Agricultural Animal Confinement Building Heaters
GASKET
BURNER RIBS
WARNING

Fire Hazard

FIG. 39
HIGH LIMIT
SWITCH
FIG. 40
HIGH LIMIT SWITCH
FIG. 41
RESET BUTTON
TERMINAL
MOUNTING
LEG
Owner's Manual • Classic
25
SENSING
SURFACE
FLAME