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Premier Ductable Heaters
www.lbwhite.com
Owner’s Manual • Premier 80-170
26
Manual Reset High Limit
Switches
This heater has two limit switches: one inside the solid
door end on the heat chamber, the other inside the
louvered door end mounted on the fan housing side
panel. Both are easily identi
fi
ed by a red reset button in
the center of the switch. See Figs. 26 and 27, Premier
170 shown.
FIG. 26
FIG. 27
Function
If the heater overheats, one or both of the limit switches
can trip, opening the electrcial circuit to the gas control
valve. Overheating is generally caused by duct restric-
tions, low voltage, blocking the heater’s air inlet, or exces-
sive gas pressure.
Resetting
If either trips, remove the red cap and
fi
rmly press the
reset button in the middle of the switch. Then, shut the
heater off and turn it back on. Determine the cause of the
limit tripping.
Testing
To ensure proper function of these critcal safety compo-
nents, both switches should be tested annually, typically
when the heater is given a thorough cleaning.
1. Remove either high limit switch.
2. Holding the switch by one of its mounting legs, apply
a small, soft
fl
ame only to the sensing portion on the
back of the switch. See Fig. 28. Be careful not to melt
the plastic housing of the switch when conducting this
test.
3. Within a minute, you should hear a click coming from
the switch, indicating the contacts of the switch have
opened.
4. Allow the switch cool down for about a minute. Remove
the red cap and
fi
rmly press the reset button on the
switch.
5. Check for electrical continuity across the switch ter-
minals to make sure the contacts have closed. Install
the red cap.
FIG. 28
WARNING
Fire Hazard
■
Do not operate the heater with the high limit
switch bypassed.
■
Operating the heater bypassed high limit switch
may lead to overheating, possibly resulting in a
fi
re, with subsequent damage to the heater or
property damage.
Burner end high limit
Fan end
high limit
RESET BUTTON
SENSING
SURFACE
TERMINAL
FLAME
MOUNTING
LEG
Содержание Premier 80
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Страница 43: ...Premier Ductable Heaters Owner s Manual Premier 80 170 43 Service Parts Identification Schematic...
Страница 46: ...Premier Ductable Heaters www lbwhite com Owner s Manual Premier 80 170 46 Notes...
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Страница 93: ...Calefactores canalizados Premier www lbwhite com Manual del usuario Premier 80 170 46 Notas...
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Страница 137: ...Fournaises Premier gainables Manuel du propri taire Premier 80 170 43 Sch mas d identification des pi ces de rechange...
Страница 140: ...Fournaises Premier gainables www lbwhite com Manuel du propri taire Premier 80 170 46 Remarques...