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Honeywell L4068 Manual page 6

Fan controls and air switches
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CONNECTING
TO PUSH-IN TERMINALS
To connect
the push-in terminals
use the following
procedure:
1. No. 14, 16, or 18 solid or No. 14 or 16 stranded
wire may be connected
to these terminals.
Do not con-
nect aluminum
wire to the push-in
terminals
on this
device.
2. Strip insulation
from wires the exact length shown
by the strip gauge on the front of the switch.
3. If stranded wire is used, insert a small screwdriver
into
the rectangular
hole (marked ,)
on the front of
the switch above the round terminal hole; push inward
and hold. Insert wire into round terminal
hole and re-
move screwdriver
(Fig. 5). If solid wire is used, it may
be inserted into the round terminal hole without using a
screwdriver.
To disconnect
either stranded
or solid wire, proceed
as follows:
1. Insert
a screwdriver
into
the
rectangular
hole
(marked ,)
on the front
of the switch.
Push inward
to release grip on wire.
2. With grip released, pull wire out of round terminal
hole.
PVSH-IN
TERMINALS
"FAN
OFF"
ADJUSTMENT
KNOB
A
FAN
DIFFERENTIAL
KNOB
FIG.
II-INTERNAL
VIEW
OF
L4068
FAN
CON-
TROL,
SHOWING
USE
OF
PUSH-IN
TERMINALS.
PUSH
SCREWDRIVER
IN AND
"OLD
TO RELEASE
WIRE
MOUNTING
HOLE
(2)
(CASE
AND
COVER
PUSH-IN
RELEASE
PUSH
IN TERMINAL
(31
R AND
RARE
COMMbf.4
-SET
PO, NT
BACKPLATE
MOUNTING
SCREW
WIRING
KNOCKOUT
(2)
FIG.
12-INTERNAL
VIEW OF L6068,SHOWING
USE
OF PUSH-IN TERMINALS.
L4068G
BEFORE ADJUSTING
SET POINT KNOB, MAKE
SURE INSULATOR
FLAP COVERS TERMINAL
SCREW BELOW KNOB.
On L4068G, the fan differential
is fixed at 12 F [ 7 C]
nominal.
The fan will start when attic temperature
rises
about
12 F [7 C] above the FAN OFF setting.
For
example, when the FAN OFF setting is 85 F [29
C] ,
the
fan will start at about 85 F [ 29 C] plus 12 F [ 7
C] ,
or
about 97 F [36
C] .
L4068 SETTINGS
FIXED
DIFFERENTIAL
L4068A,C,E,F
On some models, the differential
is fixed at approxi-
mately 35 F [ 20 C]
.
The fan starts when the plenum
temperature
rises 35 [ 20 C] degrees above the FAN OFF
setting.
For example,
when the FAN OFF setting is
100 F [38 C], the fan starts at approximately
100 plus
35 or 135 F [38 plus 20 or 58 C]
.
ADJUSTABLE
DIFFERENTIAL
(L4068A,C,E,F)
Models with adjustable differential
may be set between
20 and 50 F [ 11 to 28
C] .
Differential
is factory-set at
25 F [ 14
C] .
The fan starts when the plenum temperature
rises to the
FAN OFF
setting
plus the differential
setting.
For example,
when the FAN OFF setting
is
100 F [38 C] and the differential
is set at 25 F [ 14
C] ,
fan starts when temperature
rises to 125 F [52 C] and
stops when temperature
drops to 100 F [ 38
C] .
Changing
the differential
changes the FAN ON temperature
only.
Page
6

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