Watlow Electric Thermostat Series 142 User Manual

General Description  
The Watlow Series 142 Safety Limit is a compact,  
environmentally protected safety limit or temperature  
controller. The limit has a single thermocouple input and  
is available in several common ranges.  
Series 142  
User’s Manual  
The Series 142 Safety Limit has a single mechanical  
relay output, and operates as a high limit, latching control  
with manual and/or auto-power reset. Fixed set points are  
available.  
The Series 142 Safety Limit controller is ideally  
suited for limit applications requiring tamper-proof opera-  
tion, agency approvals and immunity to hostile environ-  
ments.  
• The factory-fixed set point cannot be altered by operator  
action or neglect.  
• Agency approvals ensure compliance with recognized  
standards.  
• Epoxy potting makes the Series 142 resistant to envi-  
ronments with vibration or humid/corrosive conditions.  
Compact size and sub-panel mounting make the  
Series 142 readily adaptable to many applications. Its  
single, factory-fixed set point thermocouple input and  
Form C, 3 amp electromechanical relay output provides  
simplicity and reliability for many applications. Sensor  
break protection ensures fail-safe process shut down upon  
input failure.  
Safety High Limit or  
Safety Information  
On-Off Heat Controller  
We use note, caution and warning symbols through-  
out this manual to draw your attention to important oper-  
ational and safety information.  
TOTAL  
A “NOTE” marks a short message to alert you to an  
important detail.  
CUSTOMER  
SATISFACTION  
3YearWarranty  
A “CAUTION” safety alert appears with information  
that is important for protecting your equipment and per-  
formance. Be especially careful to read and follow all  
cautions that apply to your application.  
A “WARNING” safety alert appears with information  
that is important for protecting you, others and equipment  
from damage. Pay very close attention to all warnings that  
apply to your application.  
The safety alert symbol, ç, (an exclamation point in  
a triangle) precedes a general CAUTION or WARNING  
statement.  
The electrical hazard symbol, Ó, (a lightning bolt in a  
triangle) precedes an electric shock hazard CAUTION or  
WARNING safety statement.  
1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580  
Phone: +1 (507) 454-5300, Fax: +1 (507) 452-4507,  
0600-0023-0000 Rev E  
March 2002  
$5.00  
Made in the U.S.A.  
Supersedes  
0600-0023-0000 Rev D  
 
Wiring  
P3  
P2  
Thermocouple +  
Thermocouple -  
NOTE: All terminals are 4mm (1/4 in.) quick connects.  
P1  
P3  
Thermocouple +  
Reset  
P2  
Thermocouple -  
Temperature  
Control Output  
P1  
External  
Load  
L2  
N.O.  
L2  
L1  
Reset  
N.C.  
Neutral  
N.O.  
N.C.  
L2  
L1  
L1  
120V~  
Fuse  
Fuse  
Figure 3d — 3A mechanical relay wiring.  
Hot  
P3  
Thermocouple +  
Figure 3a — 120V~ power wiring (142A - _ _ _ _ - 1 _ 00).  
P2  
Thermocouple -  
Red  
P1  
P3  
Thermocouple +  
P2  
Reset  
Thermocouple -  
P1  
N.O.  
N.C.  
L2  
L1  
Reset  
N.O.  
N.C.  
L2  
L1  
Fuses  
208/240V~  
Figure 3e — Thermocouple wiring.  
NOTE: Extension wire for thermocouples must be of the same alloy  
as the thermocouple itself to limit errors.  
Figure 3b — 208/240V~ power wiring  
(142A - _ _ _ _ - 2 _ 00).  
Remote Setpot  
Green  
P3  
Thermocouple +  
Black  
P2  
P3  
Thermocouple -  
Thermocouple +  
Red  
P1  
P2  
Thermocouple -  
P1  
Customer Supplied  
N.O. Momentary Switch  
Reset  
Reset  
N.O.  
N.C.  
L2  
L1  
L2  
L1  
N.O.  
N.C.  
Figure 3f — Remote setpot (142A - 2 _ _ _ - _ _ 00).  
Figure 3c — Reset switch.  
NOTE: Jumpering the reset terminals does not convert from limit  
to an on-off control mode.  
Watlow Series 142  
User’s Manual I 3  
 
System Wiring Example  
L2  
L1  
Fuse  
Control  
Power  
Earth  
Ground  
21  
22 11  
12  
N.O.  
13  
COM  
L1  
Load  
Power  
Fuses  
(+) 9  
10  
(-)  
Indicator  
turns on  
when limit trips  
988A-2BA0-0000  
Rear View  
N.C. N.O.  
COM  
Series 142  
High Limit  
Mechanical  
Contactor  
142A - 3 _ _ _ - 1200  
Safety Limit Control  
L2  
Thermo-  
couple  
Load  
Power  
N.O.  
-
+
Limit  
Power  
L1  
L2  
Heat  
Load  
Fuse  
Process  
Sensor  
Momentary Switch  
Manual Reset for Limit Control  
Limit Sensor  
Figure 4 — System wiring example.  
WARNING:  
Install high or low temperature limit control protection in sys-  
tems where an overtemperature fault condition could present a  
fire hazard or other hazard. Failure to install temperature limit  
control protection where a potential hazard exists could result  
in damage to equipment and property, and injury or death to  
personnel.  
ç
CAUTION:  
Watlow mercury relay loads must have a unity power factor.  
For RESISTIVE LOADS ONLY.  
4 I User’s Manual  
Watlow Series 142  
 
Specifications  
(2072)  
Output  
Limit Control Mode  
High limit control  
Latched manual reset with 1.7°C (3°F) hysteresis  
Can only be reset when process temperature drops below limit  
set point. Terminals are provided for remote reset in the event of  
an overtemperature condition. (Reset switch supplied by user.)  
1
Electromechanical relay , SPDT, 3A @ 120/240V~ or 3A @  
30VÎ (dc), Form C, with RC suppression on on-off temperature  
controller version. Off-state output impedance is 20kwith RC  
suppression.  
Output Relay Status Upon Power Restoration  
(Assuming process temperature is not above set point.)  
Auto reset: Output relay automatically re-energizes  
On-off Temperature Control Mode  
Off when process temperature exceeds factory-fixed or remote  
adjustable set point  
On when process temperature is less than factory-fixed or  
remote adjustable set point  
Hysteresis (switching differential) 1.7°C (3°F) nominal  
Manual reset: Manual reset is required to re-energize output relay  
Line Voltage/Power  
120V~, 10%; (108-132V~), 50/60Hz, 5%  
208/240V~, 10%; (187-264V~), 50/60Hz, 5%  
Power consumption 4VA maximum  
Agency Approvals  
Operating Environment  
and  
, File #E43684  
0 to 65°C (32 to 149°F)  
0 to 90% RH, non-condensing  
197 Commercial Cooking Appliances  
873 Temperature Indicating and Regulating Equipment  
991 Test for Safety Related Controls Employing Solid State  
Devices  
Storage Temperature  
-40 to 85°C (-40 to 185°F)  
Terminals  
®
US  
#C3236001 approved, Gas Appliance Thermostat, ANSI  
14 inch quick connect lugs (spade/ appliance)  
Dimensions  
Z21.23  
CE 89/336/EEC Electromagnetic Compatibility Directive  
EN61326, Immunity, Class B Emissions  
CE 73/23/EEC Low Voltage Directive  
EN60730-1, EN60730-2-9, Safety  
Controller  
Length  
Width  
Height  
Controller Weight  
Shipping Weight  
102mm  
70mm  
103mm  
0.36kg  
0.57kg  
(4 in.)  
(2.8 in.)  
(4.05 in.)  
(0.79 lb.)  
(1.25 lbs.)  
Operator Interface  
Non-adjustable, factory-fixed or remote adjustable set point  
Remote Set Point  
Dial scale calibrated to compensate for sensor non-linearity  
Dual °F/°C scales  
Set Point Assembly  
Dial Scale  
Pot Depth Behind  
Knob Depth in Front  
Lead Length  
Weight  
76mm  
25mm  
31mm  
610mm  
0.09kg  
(3 in. sq.)  
(1.0 in.)  
(1.2 in.)  
(24 in.)  
Accuracy  
Adjustable Set Point  
Calibration accuracy: 1% of span, at 25°C 3°C (77°F 5°F)  
ambient and rated line voltage 1%  
(0.2 lb.)  
Set point accuracy: 3% of dial scale  
Accuracy span: 540°C (1000°F) minimum  
Fixed Set Point  
1
Electromechanical relays are warranted for 100,000 closures  
only.  
UL® is a registered trademark of Underwriter’s Laboratories, Inc.  
Note: Specifications subject to change without notice.  
Calibration accuracy: 6°C /10°F of setting, at 25°C 3°C (77°F  
5°F) ambient and rated line voltage 1%  
Thermocouple Stability  
Thermocouple: Typically 9µV/°C ambient ( 5µV/°F ambient) input  
referenced  
RTD: Typically 0.2°C/°C ambient (0.2°F/°F ambient)  
Voltage Stability  
0.01% of span (min span of 540°C or 1000°F) per % of rated  
line voltage  
Thermocouple Input  
Grounded or ungrounded Type E, J, K or T. Sensor break  
protection de-energizes output.  
Factory-set, thermocouple ranges  
Watlow Series 142  
User’s Manual I 5  
 
Ordering Information  
(2071)  
To order, complete the code number  
to the right with the information below:  
1 4 2 A - _ _ _ _ - _ _ 0 0  
Series 142 = Temperature safety limit,  
limit, latching 3A relay, environmentally sealed  
controller, or basic on-off temperature controller  
Output Type  
A = Electromechanical relay1, Form C, 3A, with RC  
suppression on on-off temperature controller, without  
contact suppression on limit controller  
Set Point  
2 = Remote/Adjustable2  
3 = Fixed (See below for available factory-fixed set points)  
Input (Thermocouple)  
ANSI Type E  
669 = 110°C (230°F)  
685 = 129°C (265°F)  
670 = 150°C (302°F)  
668 = 155°C (311°F)  
679 = 185°C  
684 = 232°C  
675 = 260°C  
678 = 296°C  
(365°F)  
(450°F)  
(500°F)  
(565°F)  
682 = 302°C  
664 = 566°C (1050°F)  
(575°F)  
ANSI Type J  
706 = 0 to 315°C  
(32 to 600°F)  
6033 = 275°F (135°C)  
6043 = 300°F (149°C)  
6053 = 325°F (163°C)  
6063 = 350°F (177°C)  
707 = 360°F (182°C)  
6073 = 375°F (191°C)  
6083 = 400°F (204°C)  
6993 = 425°F 218°C()  
689 = 444°F (229°C)  
704 = 465°F (240°C)  
6983 = 450°F (232°C)  
6123 = 475°F (246°C)  
6133 = 500°F (260°C)  
614 = 525°F (274°C)  
615 = 550°F (288°C)  
616 = 575°F (302°C)  
617 = 316°C (600°F)  
618 = 329°C (625°F)  
693 = 343°C (650°F)  
620 = 357°C (675°F)  
621 = 371°C (700°F)  
622 = 385°C (725°F)  
623 = 399°C (750°F)  
624 = 413°C (775°F)  
625 = 427°C (800°F)  
627 = 454°C (850°F)  
628 = 468°C (875°F)  
696 = 482°C (900°F)  
630 = 496°C (925°F)  
631 = 510°C (950°F)  
632 = 524°C (975°F)  
633 = 538°C (1000°F)  
626 =  
718 =  
653 =  
666 =  
686 =  
6093 =  
681 =  
672 =  
6003 =  
10°C  
16°C  
(50°F)  
(61°F)  
46°C (115°F)  
63°C (145°F)  
65°C (149°F)  
68°C (155°F)  
79°C (175°F)  
85°C (185°F)  
93°C (200°F)  
688 = 102°C (215°F)  
6013 = 107°C (225°F)  
719 = 110°C (230°F)  
6023 = 121°C (250°F)  
715 = 129°C (265°F)  
ANSI Type K  
673 = 648°C (1198°F)  
637 = 649°C (1200°F)  
638 = 677°C (1250°F)  
639 = 704°C (1300°F)  
640 = 732°C (1350°F)  
687 = 750°C (1382°F)  
717 = 399°C (750°F)  
641 = 760°C (1400°F)  
642 = 788°C (1450°F)  
643 = 816°C (1500°F)  
644 = 843°C (1550°F)  
645 = 871°C (1600°F)  
646 = 899°C (1650°F)  
647 = 927°C (1700°F)  
648 = 954°C (1750°F)  
649 = 982°C (1800°F)  
650 = 1010°C (1850°F)  
651 = 1038°C (1900°F)  
652 = 1066°C (1950°F)  
692 = 1093°C (2000°F)  
654 = 1121°C (2050°F)  
655 = 1149°C (2100°F)  
656 = 1177°C (2150°F)  
657 = 1204°C (2200°F)  
658 = 1232°C (2250°F)  
659 = 1260°C (2300°F)  
660 = 1288°C (2350°F)  
6614 = 1316°C (2400°F)  
6624 = 1343°C (2450°F)  
6634 = 1371°C (2500°F)  
716 =  
711 =  
50°C (122°F)  
52°C (125°F)  
125 = 125°C (257°F)  
619 = 149°C (300°F)  
667 = 238°C (460°F)  
671 = 288°C (550°F)  
695 = 300°C (572°F)  
690 = 315°C (600°F)  
674 = 700°C (700°F)  
677 = 420°C (788°F)  
629 = 427°C (800°F)  
691 = 468°C (875°F)  
634 = 565°C (1050°F)  
635 = 593°C (1100°F)  
636 = 621°C (1150°F)  
1
Electromechanical relays war-  
ranted for 100,000 closures  
only.  
2
User selectable range. Consult  
factory for details. Setpot  
required, sold separately.  
3
CSAUS Gas Appliance  
Thermostat approved.  
ANSI Type T  
4
Not within calibration toler-  
694 = 135°C (275°F)  
708 = -20°C  
(-4°F)  
ance range per ANSI circular  
MC96.1.  
712 = 175°C (347°F)  
713 = 200°C (392°F)  
710 = 250°C (482°F)  
705 = -200 to 350°C (-328 to 662°F)  
680 =  
714 =  
16°C  
79°C (175°F)  
(60°F)  
Note: User documentation may  
be available in French, German,  
Spanish, Italian, and Dutch, as  
well as English. Check Watlow’s  
availability. Specify language at  
time of order.  
Line Voltage/Power  
1 = 120V~  
2 = 208/240V~  
Control Operation  
2 = High Limit ControlManual reset on power loss and overtemperature  
3 = High Limit ControlAuto reset on power loss/manual reset on  
overtemperature  
4 = Temperature Controlon-off heat  
6 I User’s Manual  
Watlow Series 142  
 
Declaration of Conformity  
Series 142  
WATLOW Winona, Inc.  
1241 Bundy Boulevard  
Erklärt, dass das folgende Produkt:  
Deutsch  
Bezeichnung:  
Serie 142  
Modell-Nummern:  
142A (2 oder 3)(600 bis 999) (1 oder 2)(1, 2, 3  
oder 4) - (Beliebige zwei Ziffern oder Buchstaben)  
Temperaturregler, Installationskategorie II,  
Verschmutzungsgrad 2  
Klassifikation:  
Winona, Minnesota 55987 USA  
Nennspannung:  
Nennfrequenz:  
120 oder 208/240 V~ (ac)  
50 oder 60 Hz  
Declares that the following product:  
English  
Nennstromverbrauch:  
Max. 6 VA  
Designation:  
Series 142  
Model Numbers:  
142A (2 or 3)(600 to 999) (1 or 2)(1, 2, 3 or 4)  
(any two letters or numbers.)  
Temperature Limit Control, Installation Category II,  
Pollution degree II  
Erfüllt die wichtigsten Normen der folgenden Anweisung(en) der Europäischen Union  
unter Verwendung des wichtigsten Abschnitts bzw. der wichtigsten Abschnitte die  
unten zur Befolgung aufgezeigt werden.  
Classification:  
Rated Voltage:  
Rated Frequency:  
Rated Power Consumption: 6 VA maximum  
120 or 208/240 V~ (ac)  
50 or 60 Hz  
89/336/EEC Elektromagnetische Kompatibilitätsrichtlinie  
EN 61326:1997 mit A1:1998 – Elektrisches Gerät für Messung, Kontrolle und  
Laborgebrauch – EMV-Anforderungen (Störfestigkeit Industriebereich, Klasse  
A Emissionen)  
EN 61000-4-2:1996 mit A1, 1998 Störfestigkeit gegen elektronische Entladung  
EN 61000-4-3:1997 Störfestigkeit gegen Strahlungsfelder  
EN 61000-4-4:1995 Störfestigkeit gegen schnelle Stöße/Burst  
EN 61000-4-5:1995 mit A1, 1996 Störfestigkeit gegen Überspannung  
EN 61000-4-6:1996 Geleitete Störfestigkeit  
EN 61000-4-11:1994 Störfestigkeit gegen Spannungsabfall, kurze  
Unterbrechungen und Spannungsschwankungen  
EN 61000-3-2:1995 mit A1-3:1999 Harmonische Stromemissionen  
EN 61000-3-3:1995 mit A1:1998 Spannungsfluktationen und Flimmern  
EN 61000-3-3: 1995 Grenzen der Spannungsschwankungen und Flimmern  
Meets the essential requirements of the following European Union Directives by using  
the relevant standards show below to indicate compliance.  
89/336/EEC Electromagnetic Compatibility Directive  
EN 61326:1997 With A1:1998 – Electrical equipment for measurement, control and  
laboratory use – EMC requirements (Industrial Immunity, Class A Emissions).  
EN 61000-4-2:1996 With A1, 1998 Electrostatic Discharge Immunity  
EN 61000-4-3:1997 Radiated Field Immunity  
EN 61000-4-4:1995 Electrical Fast-Transient / Burst Immunity  
EN 61000-4-5:1995 With A1, 1996 Surge Immunity  
EN 61000-4-6:1996 Conducted Immunity  
73/23/EEC Niederspannungsrichtlinie  
EN 60730-1: 1993 Automatische elektrische Regelsysteme für de Haushalt  
und ähnlichen Einsatz, Teil 1: Allgemeine Richtlinien  
EN 60730-2-9: 1995 Automatische elektrische Regelsysteme für den Haushaltund ähn-  
lichen Einsatz, Teil 2: Spezifische Richtlinien Abschnitt 2.9, Temperaturregelsysteme  
EN 61000-4-11:1994 Voltage Dips, Short Interruptions and Voltage Variations Immunity  
EN 61000-3-2:1995 With A1-3:1999 Harmonic Current Emissions  
EN 61000-3-3:1995 With A1:1998 Voltage Fluctuations and Flicker  
73/23/EEC Low-Voltage Directive  
EN 60730-1: 1993 Automatic electrical controls for household and similar  
use, Part 1: General requirements:  
EN 60730-2-9: 1995 Automatic electrical controls for household and similar use, Part  
2; Particular requirements Section 2.9 Temperature sensing controls  
Declara que el producto siguiente:  
Español  
Designación:  
Serie 142  
Números de modelo:  
142A (2 o 3)(600 a 999) (1 o 2)(1, 2, 3 o 4) -  
(Cualesquiera dos letras o números)  
Control de temperatura, Categoría de instalación II,  
Grado de contaminación 2  
Clasificación:  
déclare que le produit suivant :  
Désignation :  
Français  
Tensión nominal:  
120 o 208/240 V~ (CA)  
Séries 142  
Frecuencia nominal:  
Consumo nominal de energía: 6 VA máximo  
50 o 60 Hz  
Numéros de modèles :  
142A (2 ou 3)(600 à 999) (1 ou 2)(1, 2, 3 ou 4)  
(Nimporte quelle combinaison de deux lettres ou  
chiffres)  
Classification :  
Régulation de température, Catégorie dinstallation  
II, Degré de pollution 2  
120 ou 208/240 V~ (c.a)  
Cumple con los requisitos esenciales de las siguientes Directrices de la Unión  
Europea mediante el uso de las normas aplicables que se muestran a continuación  
para indicar su conformidad.  
Tension nominale :  
Fréquence nominale :  
50 ou 60 Hz  
Consommation dalimentation nominale : 6 VA maximum  
89/336/EEC Directriz de compatibilidad electromagnética  
EN 61326:1997 CON A1:1998.– Equipo eléctrico para medición, control y uso  
en laboratorio – Requisitos EMC (Inmunidad industrial, Emisiones Clase A).  
EN 61000-4-2:1996 con A1, 1988 Inmunidad a descarga electrostática  
EN 61000-4-3:1997 Inmunidad a campo radiado  
EN 61000-4-4:1995 Inmunidad a incremento repentino/rápidas fluctuaciones  
eléctricas transitorias  
EN 61000-4-5:1995 con A1, 1996 Inmunidad a picos de voltaje o corriente  
EN 61000-4-6:1996 Inmunidad por conducción  
EN 61000-4-11:1994 Inmunidad a caídas de voltaje, variaciones y pequeñas  
interrupciones de voltaje  
EN 61000-3-2:1995 con A1-3:1999 Emisiones de corriente armónica  
EN 61000-3-3:1995 con A1:1998 Fluctuaciones de voltaje y centelleo.  
Répond aux normes essentielles des directives suivantes de l'Union européenne en  
utilisant les standards normalisés ci-dessous qui expliquent les normes auxquelles  
répondre :  
Directive 89/336/CEE sur la compatibilité électromagnétique  
EN 61326:1997 avec A1 :1998 – Matériel électrique destiné à l’étalonnage, au  
contrôle et à l’utilisation en laboratoire – Exigences CEM (Immunité indus-  
trielle, Émissions de catégorie A).  
EN 61000-4-2:1996 Avec A1, 1998 Immunité aux décharges électrostatiques  
EN 61000-4-3:1997 Immunité aux champs de radiation  
EN 61000-4-4:1995 Immunité contre les surtensions électriques rapides/ Rafale  
EN 61000-4-5:1995 avec A1, 1996 Immunité contre les surtensions  
EN 61000-4-6:1996 Immunité conduite  
73/23/EEC Directiva de Baja Tensión  
EN 61000-4-11:1994 Immunité contre les écarts de tension, interruptions courtes  
et variations de tension  
EN 61000-3-2:1995 avec A1-3 :1999 Emissions de courant harmoniques  
EN 61000-3-3:1995 avec A1 :1998 Fluctuations et vacillements de tension  
EN 60730-1: 1993 Controles eléctricos automáticos para electrodomésticos y  
aparatos de uso similar, Parte 1: Requerimientos generales  
EN 60730-2-9: 1995 Controles eléctricos automáticos para electrodomésticos y  
aparatos de uso similar, Parte 2: Requerimientos particulares Sección 2.9, Controles  
para detección de temperatura  
Directive 73/23/CEE sur les basses tensions  
EN 60730-1 : 1993 Commandes électriques automatiques à usage domes-  
tique et similaire, Partie 1: Exigences générales  
Jim Boigenzahn  
Name of Authorized Representative  
Winona, Minnesota, USA  
Place of Issue  
EN 60730-2-9 : 1995 Commandes électriques automatiques à usage domestique  
et similaire, Partie 2: Exigences particulières, Section 2.9 Commandes de détec-  
tion de la température  
General Manager  
Title of Authorized Representative  
December 2001  
Date of Issue  
(2210)  
Signature of Authorized Representative  
Watlow Series 142  
User’s Manual I 7  
 
Glossary  
Returns  
• Call or fax Customer Service for a Return Material  
Authorization (RMA) number before returning a con-  
troller.  
• Put the RMA number on the shipping label, and also on  
a description of the problem.  
automatic power reset — A feature in latching limit  
controllers that does not recognize power outage as a limit  
condition. When power is restored, the output is re-ener-  
gized automatically, as long as the temperature is within  
limits.  
• 20% of net price restocking charge applies to all stan-  
dard units returned to stock.  
electrical noise immunity — Ability of a temperature  
control to operate normally in the presence of electrical  
noise interference.  
Technical Assistance  
fixed set point — Temperature set point is preset at the  
If you encounter a problem with your Watlow con-  
troller, review all of your configuration information to verify  
that your selections are consistent with your application:  
inputs; outputs; alarms; limits; etc. If the problem persists  
after checking the above, you can get technical support by  
dialing +1 (507) 492-5300, 7 a.m. to 7 p.m. Central  
Standard Time. An applications engineer will discuss your  
application with you.  
factory. It cannot be readjusted in the field.  
latched output — Limit control output latches in de-  
energized condition when overtemperature condition  
occurs and cannot be reset unless temperature drops  
below set point.  
limit or limit controller — A highly reliable, discrete  
safety device (redundant to the primary controller) that  
monitors and limits the temperature of the process or a  
point in the process. When temperature exceeds or falls  
below the limit set point, the limit controller interrupts  
power through the load circuit. A limit controller can pro-  
tect equipment and people when it is correctly installed  
with its own power supply, power lines, switch and sensor.  
Please have the following information available  
when calling:  
• Complete model number  
• Serial Number  
• All configuration information • User’s Manual  
Warranty  
manual reset — A feature on a limit controller that  
requires human intervention to return the limit to normal  
operation after a limit condition has occurred.  
The Watlow Series 142 is warranted to be free of  
defects in material and workmanship for 36 months after  
delivery to the first purchaser for use, providing that the  
units have not been misapplied. Since Watlow has no con-  
trol over their use, and sometimes misuse, we cannot  
guarantee against failure. Watlow's obligations hereun-  
der, at Watlow's option, are limited to replacement, repair  
or refund of purchase price, and parts which upon exami-  
nation prove to be defective within the warranty period  
specified. This warranty does not apply to damage result-  
ing from transportation, alteration, misuse, or abuse.  
safety limit — An automatic limit intended for use in  
applications where an over-temperature fault may cause a  
fire.  
Your Feedback  
Your comments or suggestions on this manual are  
welcome. Please send them to: Technical Writer, Watlow  
Controls, 1241 Bundy Boulevard, P.O. Box 5580, Winona,  
Minnesota 55987-5580; phone: +1 (507) 454-5300; fax: +1  
(507) 452-4507. The Series 142 User’s Manual is copy-  
righted by Watlow Winona, Inc., © 2001, with all rights  
reserved. (2209)  
8 I User’s Manual  
Watlow Series 142  
 

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