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Limit Control - Honeywell L4068 Manual

Fan controls and air switches
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FAN OFF SET POINT
Set FAN OFF to temperature
recommended
by burner
or attic fan manufacturer.
On replacement
installations,
use temperature
set on old control.
NOTE (L4068A,C,E,F):
If the fan runs too long after
'v
burner shutdown
(as evidenced by cold drafts), raise
the FAN OFF setting. Raising the FAN OFF setting
simultaneously
raises the FAN ON setting by the same
amount.
If the fan does not run long enough after
burner
shutdown
(as evidenced
by recycling),
lower
the FAN OFF setting.
L6068 SETTING
The
L6068 switch makes R-W and breaks R-B when
the temperature
at the sensing
element
rises to the
set point. When the temperature
falls 20 F [ 11 C] below
the set point,
the switch breaks R-W and remakes R-B.
On the L6068A the set point is adjustable
from 125
to 165 F [52 to 74 C] ; turn the knob on front of the
switch
until
indicator
points
to the temperature,
at
which
the switch
should
break
R-B and make R-W.
CHECKOUT
\--_/
L4068A,C,E,F
After mounting
and wiring are complete, turn on the
power supply and allow the system to operate through
one complete cycle. To check the furnace limit control,
disconnect
the fan and set the thermostat
to call for
heat. The burner should come on and the limit control
should shut off the burner when the plenum temperature
reaches the limit control
set point. Reconnect
the fan.
Again set the thermostat
to call for heat. The burner
should come on and the fan should come on when the
plenum
temperature
reaches
the FAN ON set point.
L4068G
-
After mounting
and wiring are complete, turn on the
power supply and turn FAN OFF setting more than 12 F
[7 C] below attic temperature.
Fan should come on.
Turn setting dial above attic temperature.
Fan should go
off. Reset control to desired FAN OFF setting.
L6068 USED AS A SECONDARY
LIMIT CONTROL
After completing
mounting
and wiring, turn on the
power supply and let the system operate through
one
complete
cycle. Actuate
the control
by blocking
the
filter
until
the temperature
reaches the set point
of
the L6068.
At this point
the furnace should cut out
and the fan should start or continue
operating.
L6068 USED AS A TWO-SPEED FAN CONTROL
After mounting
and wiring are completed,
turn on
power
supply.
Set thermostat
to call for heat.
Fan
should
first come on low speed. After a short period
of operation,
the L6068 should change the fan speed to
high.
HONEYWELL
MINNEAPOLIS,
MINN. 55408
INTERNATIONAL
Sales Offices in all principal cities of the world. Manufacturing in
Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
PRINTED IN U.S.A.

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