Chromalox BCT-820E Thermostat User Manual

Chromalox’
Installation, Operation
and RENEWAL PARTS IDENTIFICATION
DIV. 4 |SEC. BCT NUMBER 3001
SALES
REFERENCE PK451
161-058028-001
DATE DECEMBER, 1986
Chromalox Indicating Thermostat Control — Model BCT
(Creed os
Г "ня Що
| Model BCT-800
Figure 1
Model BCT-820E
Figura 2
O 1986 Edwin L. Wiegand Division, Emerson Electric Co.
Model Numbers are listed below
Specifications — Table A
_ Thermal Element _
Dual Temp. Model Bulb and Cap Сер __ Bulb (IN)
Range Number Material . Length (FT) | Dia. Length .
BCT-800-4BC
_ _ . Copper 6 Ya 6%
Й 40° to 120% BCT-802-4BC 7
— 10
ml Haat, Stainless Steel 6 6%
BCT-B0O0-6BC Copper 6 % 4% 4
BCT-B02-6BC* Copper 6 % 4%.
OF to 250% | BCT-8O0-
| 20° 50 120°C en Beene) Stainless Steel 6 % 4%,
BCT-800-6BS-TEF Teflon Covered 10 2»
BCT-B02-6BS-TEF" | Stainless Steel % ha
o о = -
le e Tec RENO ee Stainless Steel 6 % 2%
o o - -
10°10 340°C | BCT.802.885+ — | Steinless Steel | в % 3
o a .800-
UN ОА BOONE, Stainless Steel 6 % 4% 4
Explosion Proof Modals ges _
BCT-820E-4BC
. , " Copper 6 % 6%
- to
BET B20E-4BS, | Stainless Steel 6 % 6%
BCT-820E-6BC
BCT-822E-68C * Copper 2 A 4%в
a e - а
-20% 10 120°C| BCT.822E.6B5* | Steinless Steal | @ % | av
BCT-820E-68S-TEF | Teflon Covered 10 % 4%
BCT-822E-6BS-TEF"| Stainless Steel ue
400° BCT- - ;
-20 to 200°€ | BCT-822€-785- | Stainless Steel | 6 » | 2%
o - -
10° to 340% |BCT-822€-885- — | Stainless Steel | 6 % 3
50 to 1000°F | BCT- - ;
10° to e ALICE PEONES Stainless Steel 6 % 4%
*Dual Switch Models
DIMENSIONS
BCT-800 & 802 BCT-820E & 822E
{All Models} Explosion Proof
{All Models}
21 CLEAR FOR % | 1%
я — SCREW Na
i ;
CLEAR FOR "8 a 1 4 MT'G HOLES 7
#10 SCREW A
2 MT'G EARS зо
(FLUSH MT'G) ] a
11
5 ña g
147%
% DIA. E/C
35 CLEAR FOR #8 SCREW 2 KNOCKOUTS
ie 2 MT'G HOLES 1 OPPOSITE SIDE
J [PANEL MT'G)
З% 6
CAPILLARY 2 + 4
CAPILLARY \
Figure 3 Figure 4
GENERAL
CAUTION: Models BCT-800 and 802 are not for use
in hazardous environments as described in National
Electrical Code. Failure to comply can result in explo-
sion or fire.
NOTICE: Type BCT controls are designed for temperature con-
trol service only. Because they do not fail safe, they should not
be used for temperature limiting duty.
CAUTION: Users should install adequate controls and safety
devices with their electric heating equipment. Where consequences
of failure may be severe, back-up controls are essential. Although
the safety of the installation is the responsibility of the user,
Chromalox will be glad to make equipment recommendations.
Model BCT is an indicating temperature controller designed to
control healing and/or cooling systems. They are supplied with
either one or two 3-wire, single-pole, double-throw switch(es) of
the snap-acting type. The control is actuated by an oil filled thermal-
sensing element except for 9BS models which are mercury filled.
All are field replaceable and interchangeable with other elements
of the same range as indicated in Table À.
NOTE: It is not recommended to switch systems directly from
heating to cooling and vice versa.
Power Supply — WARNING: Use on AC only. Thermostat is
not DC rated.
Specification — Table B
Packing Glands — If a sealed or leak-proof connection is required
at the point where the capillary enters the oven, tank, pipe or similar
equipment, an appropriate packing gland is available as an optional
part. (Catalog Numbers V42-25A, V42-25D or V42-25E)
Principle of Operations — Temperature variations are sensed by
the liquid-filled bulb which hydraulically transmits motion through
a bellows to a rack-pinion mechanism which rotates the indicating
pointer and actuates the precision snap-acting switch(es). Controller
settings are made by turning the adjustment knobs causing the cams
to reposition the precision snap switch(es) in relation to the ther-
mal sensing system.
Process Temperature Differential — is variation in controlled
process temperature between maximum, when thermostat turns
OFF and minimum, when thermostat turns ON. This spread in
temperature may be minimized by —
1. Avoiding excess heating capacity (oversized heaters).
2. Locating control sensing bulb in optimum position between
heat source and work.
In general, it is difficult to predict the actual operating differen-
tial of a given process. Temperature differential may be as low
as 2 °F for low range controls to as high as 10°F for higher range
controls since the differential is a percentage function of the dial
range.
Storage Temperature:
Ambient Temperature
Limits:
Shock:
Vibration:
Enclosure Classification:
BCT-BCO, 802,
BCT-B20E, B22E
Explosion Proof)
Set Point Repeatability:
Indication Accuracy:
Switch Output:
Dual Switch Adjustment:
—65 to + 160%.
- 40 to + 160°F. Set point typically shifts
less than 1% of range for a 50°F (28°C)
ambient temperature change.
Set point repeats after 15 G, 10 millisecond
duration.
Set point repeats after 2.5 G, 5-500 CPS.
NEMA 1,
NEMA 4, 7, 9
+ 1% of adjustable range
+ 19% of adjustable range
(1) or {2) SPDT. Dual switch may be
separated up to 100% of range.
Dual switch controls standardly have
separate knob & temperature pointers for
each switch. Turn inner knob for setting #1
switch and outer knob for #2 switch.
Electrical Rating:
Enclosure:
BCT-800, 802,
BCT-B20E, B2ZE
Explosion proof)
Faceplate:
Weight;
BCT-800, 802
BCT-820E, 822E
Explosion proof)
Electrical Connection:
BCT-800, 802
Wiring (800, 802)
BCT-820E, 822E
Explosion proof)
Temperature Deadband:
15 amp 125/250/480 VAC resistive
Lexan, black finish.
Die cast aluminum {max 0,4% copper), light
grey aluminum lacquer finish, gasketed.
Clear Lexan®
Approx. 3 lbs. 4 oz.
Approx. 7 Ibs.
{2} 75” diameter knockouts.
#18 AWG color coded leadwires, approx.
9” exposed with strain relief.
3% " NFT right hand side, Terminal block
standard.
Typically 1% of range under laboratory
cond tions, (70°F ambient, circulating bath
at rate of 2 °F per minute change).
MOUNTING
NOTE: Do not mount control where it will be subject to vibra-
tion, shock, grease, dust, lint or corrosive vapors. Do not mount
adjacent to a large magnetic contactor, as vibration and shock will
cause thermostat to interact erratically — resulting in chattering
of the contactor.
The air temperature in and around the control enclosure should
be kept as near to normal room temperature as possible...never
above 160°F nor below —40°F.
1. Remove adjustment knobs and cover,
2. Knockout Electrical Entrance — Two cast-in knockouts for
Ya" conduit are located in the sides of the enclosure. Either can
be easily knocked out with a screwdriver by placing its blade in
the groove and rapping its end sharply with a hammer.
3. The BCT-800 or 802 can be either surface or flush mounted.
BCT-820E or 822E can only be surface mounted.
A. Surface mounting —
1. BCT-800 or 802 model (See Figure 5). Attach the two (2)
mounting tabs found in separate package to recessed areas on back
side of enclosure using the two (2) self-tapping flat head screws.
Using two (2) #10 screws with nuts, mount the control to the sur-
face or panel.
CONTROL
BACK
© | — RECESSED AREA —— [a
@ <)
\
\
\
\
1
\
\
\ 6%
\
\
\
—+ | |
\ % " HOLE OR CLEARANCE
FOR NO. 10 SCREW — (2) PLACES
Figure b
2. BCT-820E or 822E (See Figure 6). Using four (4) 4"
screws with nuts, mount the control to the surface or panel
(BCT-822E models require a seal fitting, install the nipple and seal-
ing fitting prior to surface mounting the control).
C
2e —
>
а” HOLE OR CLEARANCE
FOR % " SCREW
(4) PLACES
Figure 6
B. Flush Mounting
|. The controller may be mounted in any position to a flat
surface or panel ('4” thick maximum).
2. Cut out the pane! as shown in Figure 7. Mount to the panel
using the 2 holes located on the flange of the enclosure.
Te md 7
|+ —— 2234, - he 32
O
|
I бам,
6%:
CLEARANCE FOR NO. 8 7
SCREW — 12) PLACES —
PANEL CUTOUT FOR FLUSH MOUNTING
Figure 7
C. Bulb and Capillary Mounting
|. Fully immerse the bulb and 6” of capillary in the control
zone. For best control it is generally desirable to place the bulb
close to the heating or cooling source in order to sense temperature
fluctuations quickly. Be sure to locate the bulb so it will not be
exposed to temperatures beyond the instrument range limits.
2. Place the remaining capillary adjacent to the control head
so that it will sense the same ambient temperature.
3. Factory calibraiton, unless specified otherwise, allows for
6" capillary tube in the control zone. If longer lengths are required
recalibration may be necessary, in which case follow the procedures
outlined in CALIBRATION.
4. Avoid bending or coiling the capillary tube tighter than A ”
radius. Exercise caution when making bends near the capillary ends.
NOTE: If material in contact with bulb or capillary is corrosive,
a protective well should be used. Protective wells are available at
extra cost. Check factory.
NOTICE: —
A. Bending or deforming sensing bulb will alter control calibration.
B. Do not kink capillary tube. The resulting constrictions in fluid
flow can destroy control function or broaden temperature differen-
tial. Minimum capillary tube bending diameter is 1” I.D. (See
Figure 8)
1”
ROD
Figure 8
{Capillary Tube]
C. Any deformations of bulb or capillary that result in leakage
of fluid from control renders control inoperative,
D. Avoid passing control capillary tube through zones whose
temperature is in excess of controlled process temperature. Erratic
control or destruction of control function may result.
WIRING
CAUTION: Hazard of electrical shock. Disconnect all
power before wiring or servicing this control. Failure
to comply can result in electrical shock or
electrocution.
1. Electric wiring must be installed in accordance with the Na-
tional Electrical Code and with local codes. WARNING: Use cop-
per conductors only.
2. BCT-800 and 802 models:
A. Connect the electrical conduit to the case securing it with
a locknut.
B. Wire through the knockout directly to the leadwires provid-
ed, color coded as follows:
NOTE: Dual Switch BCT-802 models, the #1 switch set point may
not be set higher than that of the #2 switch.
C. The normally-closed contacts will open on temperature rise
and are used on heating applications.
D. The normally-open contacts will close on temperature rise
and are used on cooling applications.
NOTE: Electrical connections should be made with generous loops
of wire — approximately 6” per lead.
3. BCT-820E and 822E
A. Wiring to control housing must be in rigid conduit also in
accordance with National Electrical Codes (NEC) for hazardous
locations.
B. Connect the rigid conduit directly to the die cast aluminum
Switch 1 Switch 2 enclosure
BCT-802 Model Onty) M . . . .
- : у C. Wire directly to the switch (single switch Figure 11) or to
Common Violet Yellow the terminal block (dual switch — Figure 12),
NE e E Ld Orange 4. NOTE: If load amperage or voltage rating exceeds switch
oma y -ose ac ê rating, a contactor must be used. (See Figures 13 and 14). Con-
See Figures 9 and 10. tactor and wiring to be supplied by customer.
O Ne
no COM LS e: сом ® ® сом T = | | ORANGE Wt
BLUE A E RED
BLACK SWITCH #2 SWITCH #1 YELLOW
VIOLET VIOLET
BLUE +
BLACK
Figure 9 SINGLE SWITCH Figure 10 DUAL SWITCH
VIOLET
NC NO COM vu
NC
® ® ®
o— COM
NO
NC
5 TERM
BLOCK
Figure 11 SINGLE SWITCH Figure 12 DUAL SWITCH
HEAT COOL < VIOLET
COOLING LOAD HEATING LOAD A 7 COM A
CONTACTOR - O TM BLUE
i rat a
| oe 7
|| | | BLACK
8 | (PILOT | NC_NU |
Tie ETT Je
Si PILOT E:
8 Po
paie TIA |“ |
| | 1 |
1 I
' I
LOAD LOAD
p--------e-----
L
Figure 13
SINGLE SWITCH
WIRING
LINE
IZ
m
E
o o—;
: i
В í
J i
coli {PILOT ? COIL PILOT
E = | BLACK
4 4 Л 1° | | | HEAT COOL
|
1 i |
+ 1 Т
| | | y !
| & i | NO NC
LOAD 1 LOAD | BLUE
1_ = a «ly i NO 0———
— A VIOLET
COM <|o
Slo.
COOLING LOAD HEATING LOAD Е 158
CONTACTOR CONTACTOR AB
mir
HEAT COOL ELLOW L i
“ ” eum и
+ 7 COM
== | ORANGE
1 Tar IN
1
LINE _ LINE
| | E | | RED
i = ‘| ©
: Л NC
PILOT
y COIL RE COI SWITCH 82
adi > PILOT
| (
| | ' ф--- | l
'
LOAD | Loan !
DUAL SWITCH
Figure 14
CAUTION: Hazard of efectric shock. Extreme care
should be exercised during calibration adjustments
because of shock hazard due to exposed electrical
terminals.
These controls are factory calibrated to the range indicated on
the dial scale of the control.
If calibration is required either one of two methods may be
followed.
1. If accurate measurement standards are not available, the ther-
mostat can be adjusted readily to a known temperature standard
such as boiling water (212 °F). (See Figure 15).
2. With the aid of an accurate thermometer or other temprature
measuring device, recalibration may be performed within the pro-
cess as in Figure 16.
A. Make certain process temperature is stabilized, After allowing
adequate time for temperature to stabilize, compare test ther-
mometer reading with reading of black indicating pointer.
B. If the two readings do not agree, instrument should be re-
zeroed.
For either method the following general *“re-zeroing”” procedures
Should be followed.
sd “mod
CALIBRATION (continued)
guar Lod
THERMOMETER
/
7
|
y
| LOAD (Tank, vat, die or platen)
Figure 15 Figure 16
RE-ZEROING arm upward with a finger or tool simulating thermal assembly
1. Be certain process or known temperature is stabilized.
2. Move red set pointer of BCT to temperature indicated by test
thermometer or to the known temperature.
3. Remove setting knob and instrument cover; See Figure 17.
4. Using %4” wrench, turn the zero adjustment “C” accordingly
until black indicating pointer reading agrees with test thermometer
reading or known temperature. Turning in lowers indicated reading.
5. Check adjustment by allowing temperature to stabilize and com-
paring readings. Repeat above steps if necessary.
6. Replace instrument cover and knob.
Adjusting Single Switch Types (BCT-800 and 820E)
1. Remove knob and instrument cover,
2. Move the adjustment pointer up scale beyond the indicating
pointer. This permits checking the set point by moving the lever
movement.
3. Connect test lights to indicate switch operation or listen for the
switch “click”.
4, Loosen adjustment ““A”' (Figure 17) until the adjustment pointer
agrees with the indicating pointer (when the switch clicks”).
5. Replace instrument cover and knob.
NOTE: Indicating pointer deflection — The indicating pointer will
read slightly low at bulb temperatures above the controller setting.
This deflection is normal and repeatable (approximately .5% of
scale range for single switch models) and is due to the transference
of the switching mechanism load to the thermal system. It can be
measured by moving the setting pointer from the high to the low
end of the scale and observing the resultant indicating pointer
deflection.
SCALE ———___|
INDICATING POINTER ———____|
ADJUSTMENT
KNOB SHAFT ——— |
SCALE MOUNTING ———__|
==
[ДА
|__——— PIVOT BRACKET
NOTE: DUAL SWITCH VERSION IS SHOWN. IN SINGLE SWITCH
VERSION, ONLY ONE SNAP-ACTING SWITCH IS USED.
_ ADJUSTMENT “B" % HEX
(DUAL SWITCH MODELS ONLY)
TT SWITCH MOUNTING SCREW
| ADJUSTMENT POINTER
ADJUSTMENT POINTER
MOUNTING SCREW - ADJUSTMENT “A”
|
GENERAL LAYOUT (LEADWIRES OMITTED
Figure 17
SCREWS (3)
WIRE CLAMP O CELE EA
(OTY-21 a oN
TRL
SWITCH BANK ASSEMBLY 4
EXTENSION SPRING Н
THERMAL ASSEMBLY 8
MOUNTING SCREWS
(ОТУ-2} Te
CAPILLARY IT
> LEVER ARM
ZERO ADJUSTMENT C — ®%в НЕХ
COMPENSATOR WRENCH FLATS — %в”
INDEX (SEE VIEW B-B)
fHERMAL ASSEMBLY HOUSING
CALIBRATIONS
INDEX
FOR CLARITY) EC
CALIBRATION (continued)
Adjusting Dual Switch Type BCT-802
1. Connect test lights to indicate switch operation or listen for the
individual switch “clicks”
2. The separation between switches is the difference between the
high and low set points. The set points are determined by setting
individual adjustment pointers and may be separated up to 100%
of the scale range apart,
3. To align either switch to the adjustment pointer the correspon-
ding adjustment “A” must be loosened and set the adjustment
pointer to y indicator pointer.
NOTE: Switch #1 cannot be set to operate at a higher setting than
switch 42. ny,£
Adjusting Dual Switch Explosion-Proof Type BCT-822E
1. Remove the explosion-proof die-cast cover to permit access to
the switches.
2. Move the adjustment pointer up scale beyond the desired dif-
ference between the switch settings. This permits checking the set-
tings by moving the actuating lever upward with a finger or tool
simulating thermal assembly movement.
3. Connect test lights to go switch operation or listen for the
individual switch “clicks” Te y
4. The set point of switch Ai is Я omit by the red adjustment
pointer. The set point of switch #+may be adjusted by up to 50%
of the range span below the switch #1 set point by turning adjust-
ment **D” in (right hand thread). See Figure 18. The set point
of switch #2 should not be above that of switch #1.
5. Toalign switch %1 to the adjustment pointer, loosen adjustment
“A” and sel the adjustment pointer to the scale.
Correction for Capillary Immersion
If the length of capillary immersed in the process differs from the
amount immersed in the factory calibration bath, a calibration shift
will occur. The error may be corrected as follows:
1. Move set pointer to highest temperature setting.
2. Note indicating scale reading with the head and sensor at room
temperature.
3. Loosen the two thermal assembly mounting screws.
SWITCH INSULATOR
e SWITCH TERMINAL
TERMINAL BLOCK
SWITCH MOUNTING
MOUNTING SCREW___ —Hôt --SCREW 2 REQ'D
WASHERS + | CONDUIT
CONN
+" ADJUSTMENT "D
TERMINAL BLOCK J
SUPPORTS (2 RECDIT
L-— ADJUSTMENT
POINTER (RED)
SCALE —H |
Ly
|"
of
%,
THERMAL ASS Y
MT'G SCREWS
2 REQ'D.
NOTE: Exploswon-proof enclosure
cover removed. Internal pointer ad:
jusiments in Figure same on
explosion proof types Adjustment
knobs and cover can be removed to
permit access.
INDICATING POINTER +
(BLACK)
> ADJUSTMENT
KNOB
THERMAL ASS Y
HOUSING
CAPILLARY
Figure 18 EXPLOSION-PROOF LAYOUT
6. Note change in indicated scale reading (if any).
7. Turn zero adjustment “C”' to bring indicating pointer reading
back to the original reading noted in RE-ZEROING. Turning in
lowers indicated reading.
NOTE: Thermal assembly can be returned to its original position
by aligning its flange with the line scribed on the instrument case.
4. Reposition the housing index against the calibration on the in- O Range Capillary Length/ Division
strument case (or skeleton casting) at a rate of | division line per 4 - 40 to 120% 4 Ft.
capillary length listed in table. Move to the left if capillary is to 6 O to 250% 2% Ft.
be added to the process, or to the right if capillary is removed from ? О 10 400°Е 2 Ft
the process. 8 50 to 650°F 2 Ft.
5. Tighten the two thermal assembly mounting screws. 9 50 to 1000°F 2% Fr.
OPERATION
CAUTION: Do not exceed maximum temperature indicated on the
scale as physical damage to the control mechanism may result.
PRE-START-UP
The control should be checked against a test thermometer of
known accuracy before being put into service. As with any preci-
sion instrument, minor adjustments may be necessary after ship-
ment and installation. See Calibration.
After installation and wiring, to check the operation of heating
systems:
1. Disconnect power,
2. Place the heat/cool selector switch, if applicable, in the heat
position. (Figures 13 and 14)
3. Adjust the setpoint ten or more degrees below the temperature
of the controlled space.
4, Restore power.
5. Slowly adjust the setpoint upward. When the setpoint reaches
the approximate temperature of the controlled space, the heating
equipment should start.
To check the operation of the cooling systems:
1. Disconnect power.
2. Place the heat/cool selector switch, if applicable, in the cool
position, (Figures 13 and 14)
3. Adjust the setpoint ten or more degrees above the temperature
of the controlied space.
4. Restore power.
5. Slowly adjust the setpoint downward. When the setpoint ap-
proximates the temperature of the controlled space, the cooling
equipment should start.
ELEMENT AND SWITCH REPLACEMENT
CAUTION: Disconnect all power before servicing this
control. Failure to comply can result in electrical shock
or electrocution.
Components most likely to require replacement are the ther-
mal assembly and the switches. Replace as follows:
Thermal Assembly Replacement
1. Thermal assemblies are ““pre-calibrated”' at the factory and can
easily be interchanged with the old one. Instructions are included
with each replacement assembly. See re-zeroing under Calibration,
Page No. 6.
2. Should the thermal assembly be removed temporarily for any
reason, it should be replaced so that the edge of its flange cor-
responds with the line scribed on the instrument case.
ELEMENT AND SWITCH REPLACEMENT (continued)
Replacement of Switches
(The leadwire’s configuration, though rather slack from the switch
bank assembly to the wire clamp, is necessary for proper controller
operation. This configuration should be duplicated when replac-
ing a switch).
1. Turn the adjustments to the upper range limit. This will permit
access to all (3) scale mounting screws.
2. Remove the scale and unscrew the screw holding pivot post
mounting bracket. Be sure to save the (2) spacers under the bracket.
(Dual switch types only).
3. Remove the tension spring from switch bank assembly.
4. The switch bank assembly can now be removed from the pivot
post.
Dual Switch Types
A. Disassemble switch #1 extension spring. This will permit ac-
cess to whatever switch needs replacement.
B. Insert new switches and leadwires on swilch bank assemblies.
C. Re-assemble switch #1 extension spring and re-install entire
assembly onto pivot post.
Single Switch Types
A. Remove the cover from the switch.
B. Insert new switches and leadwires on switch bank assemblies.
C. Re-assemble switch assembly to pivot post.
5. Re-assemble switch bank assembly tension spring.
6. Install the (2) spacers and secure the pivot post mounting
bracket.
7. Replace the scale, making sure the scale mounting holes are
properly fitted around the cast-in guides hidden by the screws.
8. Re-calibrate the set points following the procedures in Calibra-
tion Section Page No. 6.
Replacement of Switches (Explosion-Proof Types)
Single Switch Type
1. Remove die-cast aluminum cover and disconnect (3) wires at
switch terminals.
2. Remove (2) switch mounting screws, the switch and the
insulator.
3. Install insulator with new switch and mount in control.
4. Connect wires at switch terminals and adjust temperature set-
ting per wiring diagram Figures 9 thru 14.
Dual Switch Type
1. Remove die-cast aluminum cover, unscrew and remove terminal
block and insulator, letting terminal block hand.
2. Unscrew terminal block supports and remove (2) switch moun-
ting screws, washers and wire guard.
3. Lift out dual switch bank and actuating lever asembly.
4. Disconnect (6) wires at switch terminals.
5. Assemble new switches and insulators to the switch bank
assembly.
6. Connect wires at the switch terminals.
7. Install switch bank assembly, terminal block supports, in-
sulators, wire guard and terminal block in controller.
8. Adjust temperature setting.
RENEWAL PARTS IDENTIFICATION
Thermal Element
Temperature Range °F/°C | Cap Length Material Part No. Dial Scale
- 40 to 120% - 40 to 50° 5 — 300-05670000% | 169-512875.004
6 Stainless 300-056700-006
6 Copper 300-056700-008
O to 250% -20 toa 120° 6 Stainless 300-056700-010 159-512875-006
10 Teflon Covered 55 300-056700-001
0 to 4009 - 20 to 200° 6 Stainless 300-056700-012 | 169-512875-007
50 to 650°/10 to 340° 6 Stainless 300-056700-014 169-512875-008
50 ta 1000°/10 to 540° 6 Stainless 300-056700-016 | 169-512875-009
Catalog No. Switch Knob Cover Assembly
BCT-800 292-512876-001 169-512875-010 080-512877-001
BCT-802 292-512876-001 169-512875-011 080-512877-002
BCT-820E 6 822E 292-512876-002 169-512875-013 080-512877-003
The warranty below has been drafted to comply with the new
Federal Law applicable to products manufactured after December
31, 1976. This warranty gives you specific lagal rights, and you
may also have other rights which vary from state to state. The war-
ranty in no manner reduces the coverage provided to you under
the warranty It replaces.
Chromalox Warranty: Chromalox industrial products are warranted against defects in workman-
ship and materials. NO OTHER WARRANTIES, WRITTEN OR ORAL, INCLUDING, BUT NOT
LIMITED TO, WARRANTIES OF MERCHANTABILITY AND WARRANTIES FOR A PARTICULAR
PURPOSE, APPLY. No person is authorized to give any other warranty or assume any other
ability except by writlen statement from an officer of the Edwin L. Wiegand Division, Emer-
son Electric Co.
Warranty Period: This warranty extends for twelve months from dale of shipment from
factory or authorized distributor.
Limitations: Products must ba installed end maintained in accordance with Chromatox in-
slructions, Users are responsible for the suitability of the produets to their application. Thare
is no warranty against damage resulting from corrosion, misapplication, improper spacifica-
tion or ofhar eperating conditions beyond our control, Claims agamst carriers for demage in
transit must be filed by tha buyer.
Remedy: Relum the defective part or product, freight prepaid, to the location designated
by Chromalox Product Service. All such items must be accompanied by a Material Return
Authorization. This form, which includes a tear-out mailing and identification label, should
be obtainec from your local Chromalox Sales Dffica.
MENT IS THE EXCLUSIVE REMEDY AVAILABLE FROM EOWIN L. WIEGAND DIVISION, EMER-
SON ELECTRIC CO. WIEGAND IS NOT LIABLE FOR LABOR COSTS INCURRED IN REMOVAL,
REINSTALLATICN, OR UNAUTHORIZED REPAIR OF THE PRODUCT OR FOR DAMAGE OF
ANY TYPE WHATSOEVER, INCLUDING INCIDENTAL OR CONSEQUENTIAL DAMAGE. Same
states do nat allow the exclusion or limitations of incidental or consequential demapes, go
the preceding limitation or exclusion may not apply to you.
Defective items will be repaired or replaced al our oplion. SUCH REPAIR OR REPLACE
W2008L
Chromalox
PRODUCT SERVICE
600 RIDGELY ROAD, MURFREESBORO, TN 37130
EDWIN L. WIEGAND DIVISION
EMERSON ELECTRIC CO.
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