Specification
CAUTION
When adjusting the fan and l
imit
setting levers,
hold the scaleplate dial to keep it
from
turning
and straining the sensing
element.
.--~~~~~
~IMPORTANT~~~~~~--.
To L4064T uses a
bime
tal heater to turn on the
fan
90 seconds after a call for heat. When the call
for heat ends, the fan will
continue
to
run until the
fan-off
temperature
is reached . If the L4064T is
used to replace an L4064A
or
B, the blower fan
may
circulate cold air until the plenum heats up.
No
adjustment
of
the
fan-on
time
is possible.
Move the setting levers to the
contr
ol points
recom-
mended
by the
burner
or
furnace manufacturer. Use
gentle
finger
pressure.
1. Move the FAN
OFF setting lever to the
tem-
perature at which the fan is to stop to prevent
circula
-
tion of cool air.
L4064A-F
,J,R-
As the plen
um
temperature
rises,
the
bimetal sensing element
of
the control warps and
mechanically makes the fan
contacts
(at
the
FAN ON
temperature
setting). During normal operation, the call
for heat ends before the LIMIT setting is reached and
the fan contacts break as the
plenum
temperature
falls
and the FAN OFF setting is reached.
If the call for heat continues until the
temperature
in
the
plenum rises to the LIMIT setting, the
bime
tal
When installation is complete, turn on the
power
supp
ly. Disconnect the fan at the fan
mo
tor
or
L4064.
Set th
ermo
stat to call
for
heat.
Burner
sh
ould
come
on
and
limit
controller
should shut
burner
off when
plenum
temperature
reaches the
limit
set point. Turn
off
power,
reconnect the fan switch, turn on power and again set
Dear
Cu
sto
mer,
2.
Mo
ve the FAN ON setting lever as follows:
L4064A-F-FAN
ON range is from
15
F
[8
CJ
above
the FAN OFF setting to 35 F [19
CJ
below
the LIMIT OFF setting.
L406
4J,R-
FAN
ON
ran
ge
is from 20 F
[11
CJ
above the FAN OFF setting to 45 F [25
CJ
below
the LIMIT OFF setting.
L4064T-Move
the FAN ON in
dicat
or
as needed
for setting the FAN
OFF
indica
tor
an
d LIMIT
indicator. The FAN ON
indicator
is
nonfunc-
tional
on
the L4064T; the bimetal heater acts to
turn on the fan
90 seco
nds
after a call
for
heat
from
the thermostat.
3.
Move
the LIMIT setting lever to the
tempe
rature at
which the high
limit
switch is
to
break
the
burner
circuit.
L4064A-F,T
limit
range is 100 F to 250 F [55 C to 139
CJ;
L4064J,R limit range is 150 F to 350 F [83 C to 194
CJ.
MANUAL SWITCH (L4064B,0,R, T)
For constant fan operation (ov
errid
ing fan setting
levers), push the FAN switch button in. For fan to cycle
automatically,
pull button out.
element will
me
chanically break the
limit
cont
acts and
de-energize the gas
con
tro
l circuit.
L4064T-The
operat
ion
of
the L4064T is the same as
that of the L4064B except that th is co
mbi
nation fan and
limit
contro
l uses a bimetal heater to heat its bi metal
sensing element. This heater acts to a
ntic
ipate the rise
in
plenum
temperature
and
turns
on
the
fan 90 seconds
after the
ther
mostat calls for hea
t.
thermostat
to call
for
heat. On L4064A-F,J,R fan should
come
on when
plenum
temp
erat
ure
has reached fan-on
setting.
On L4064T, fan should co
me
on 90 seco
nds
after call for heat. Fan should
shut
off on all L4064
models
when call for heat
ends
and
plenum
has c
ooled
to fan-off setting.
P!
ease
send
yo
ur
com
men
ts
and
sugge
stions
to
Honeyw
ell
Inc
.
We
welcome
your
comments
and
suggestions
for
improving
this
publi·
cation.
Your
assistance
is
greatly
appreciated
and
wilf
enable
us
to
provide
better
technical
info
rmation
for
you,
10400
Yell
ow
Circ!e
Drive
Minnetonka,
Minnesota
55343
ATTN:
RCC
Publications
Supervisor
MN38-3247
HONE
YW
ELL
MI
NN
EAPOLIS,
MN
554
08
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