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LENGTH OF ELEMENT (in inches) [millimeters]
:
Self-supporting
model-10
[254]
(total
length
of
element).
Capillary
models-24
[609.6],
36 [914.4],
and 54
[ 1371.61 (flexible capillary length). Add 6 [ 152.41
inches for total length including
sensing element.
SENSING ELEMENT: Liquid-filled.
ADJUSTMENT
MEANS:
Indicators
are inside
cover.
MOUNTING MEANS: Two holes in backplate.
DIMENSIONS: See Fig. 1.
FINISH: Gray.
UNDERWRITERS
LABORATORIES
INC
COMPO-
NENT RECOGNIZED:
File No. MP466, Guide No.
MBPR-2.
CANADIAN
STANDARDS
ASSOCIATION
CERTI-
FIED: File No. LR1620, Guide No. 400-E-0.
OPTIONAL
SPECIFICATION:
L4017A
Combination
Fan and Limit Control
with fan-off scale. Unit has
fixed
fan and limit differentials.
Fan-on
setting
is
fixed at 33 F [19 C] above fan-off setting. With case
and cover.
ACCESSORY:
Adapter
plate
bag assembly,
Part No.
21136E,
to match
mounting
holes of competitive
devices.
1. Installer
must
be
a
trained,
experienced
serviceman.
2. Disconnect
electricity
before connecting
wiring
to
prevent
electrical
shock
or
equipment
damage.
3. Conduct
a thorough
checkout
after the instal-
lation is complete.
LOCATION
Locate the control
on a solid area of the furnace
casing or jacket or on the discharge plenum. The stand-
off plate
furnishes
a heat
barrier,
and
a l/4
inch
[6.4 mm] thick asbestos washer (Part No. 106638) is
provided to slip over the capillary
for air seal between
the element
clearance
hole and the diaphragm
power
head (see Fig. 4). Since the ambient
temperature
rating
is 190 F [88 C] at the switches,
this heat barrier
should be adequate for all normal applications.
Locate element
where it will be exposed
to rapid
temperature
changes
in the
furnace.
After
the
fan
starts, the element
temperature
should be affected
as
much
as practicable
by the changing
temperature
of
the outlet air and receive only enough radiant
heat to
reduce
element
temperature
lag. The element
should
not touch any internal
part of the furnace. When pro-
vided use the furnace manufacturer's
recommendations
to determine the exact location (Fig- 3).
SHARP
BEND
CAUSES
RUPTURE
WRONG
BENDNEXTTO
JOINT
CAUSES
RUPTURE
2596
FIG. 2-PROPER
POSITIONING
OF ELEMENT.
WRONG
ELEMENT
TOO FAR
FROM HEAT
SOURCE
ELEMENT
I
AIR
FLOW
ELEMENT
IN
AVERAGE
DEAD
AIR
DISCHARGE
TEMPERATURE
ELEMENT
',~~$"'""
EXCHANGER
FIG. 3-PROPER
AND IMPROPER
LOCATIONS
FOR
SENSING ELEMENT. WHEN PROVIDED,
USE
THE
FURNACE
MANUFACTURER'S
REC-
OMMENDATIONS
TO DETERMINE
THE EX-
ACT LOCATION.
FIG. 4-USE
OF ASBESTOS
WASHER
FOR HEAT
BARRIER.
MOUNTING
1. Make a 7/8 inch [ 22.2 mm] diameter hole where
the element is to be inserted.
2. Loosen
the cover screw and remove the cover
from the L4017.
3. Use the control as a template to mark the location
of the 2 mounting
holes (see Fig. 1).
4. Punch or drill the holes for the mounting
screws.
Page
3
60-2259
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