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This feature gives unusual speed of response to rapid changes of water temperature thereby preventing thermal lag. It has open on rise contact action. This control may be used as a high limit or as a low limit control. These controls have special contacts which are suitable for use on low voltage and millivolt (thermocouple generator type) circuits as well as line voltage gas valve and motor loads. DESCRIPTION THESE CONTROLS MUST BE INSTALLED BY A QUALIFIED INSTALLER. Do not exceed the specification ratings. All wiring must conform to local and national electrical codes and ordinances. This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction. This control has been accurately calibrated at the factory. Any attempt to calibrate this control will void the White-Rodgers warranty. If the boiler manufacturer recommends a control location, then follow such recommendations. If none are offered, the following information shows suggested locations. For high limit service, the control should be located in the hottest part of the boiler. This is usually near the top of the boiler. A high limit control should not be in the same section of the boiler that contains the heater or the pipes that heat domestic hot water. PRECAUTIONS CAUTION To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete. WARNING Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard. INSTALLATION For low limit or operating service, the control should be so located, that it responds to the temperature of that section of the boiler that heats domestic hot water. When tightening the control into the boiler, care should be taken to apply all leverage on the hexagonal nut so as not to injure the diaphragm or control mechanisms. WHITE-RODGERS DIVISION EMERSON ELECTRIC CO. PART NO. 37-0577E 9797 REAVIS RD., ST. LOUIS, MO. 63123 Replaces 37-0577-3 & 37-9157 (314) 577-1300, FAX (314) 577-1517 Printed in U.S.A. 9999 HWY. 48, MARKHAM, ONT. L3P 3J3 (905) 475-4653, FAX (905) 475-4625 WIRING All wiring should be done in accordance with local and national electrical codes and ordinances. If the boiler or burner manufacturer recommends a wiring Low limit control maintains domestic hot water temperature all diagram, then follow such recommendations. If none is offered, year round. this diagram shows a suggested circuit. When thermostat calls for heat, burner and circulator operate. LOW LIMIT APPLICATION — This diagram shows a common circuit on an oil fired heating system that also heats domestic hot water which is stored in a tank. THERMOSTAT FIELD T 1 4 2 3 T 5 6 T T INSTALLED JUMPERS TYPE 829A RELAY CIRCULATOR MOTOR LOW LIMIT CONTROL BURNER MOTOR HIGH LIMIT CONTROL IGNITION TRANS. TYPE 668 OIL BURNER CONTROL (LINE VOLTAGE) HOT LINE N SETTING THE CONTROL To set the control: CONTROLS WITH ADJUSTABLE DIFFERENTIAL 1. Use a screwdriver in the adjusting slot (A) on the front of the The movable indicator points to the temperature at which the control to turn the dial so that the fixed indicator (B) points contacts open. The fixed indicator points to the temperature at to the temperature at which the contacts will close. which the contacts close. The difference between these two 2. Turn the differential adjusting screw (C) until the movable indicators is the differential. indicator (D) points to the temperature at which the contacts will open. “B” FIXED INDICATOR (CUT-IN POINT) “C” DIFFERENTIAL ADJUSTING SCREW “D” MOVABLE INDICATOR (CUT-OUT POINT) “A” ADJUSTING SLOT 2 TYPE 1145 REGULATEUR D’EAU CHAUDE WHITE-RODGERS Immersion directe, differentiel reglable INSTRUCTIONS D’INSTALLATION Utilisateur: conservez ces instructions pour vous y referer au besoin! SI VOUS NE LISEZ PAS ATTENTIVEMENT CES INSTRUCTIONS AVANT D’INSTALLER ET D’UTILISER LA COMMANDE, VOUS RISQUEZ DE CAUSER DES BLESSURES ET DES DOMMAGES MATERIELS. DESCRIPTION Cette commande, concue pour servir avec un systeme de chauffage a eau chaude, est dotee d’un capteur qui est immerge directement dans l’eau de la chaudiere. Ceci lui permet de detecter immediatement les changements rapides de la temperature de l’eau, evitant ainsi tout decalage thermique. La commutation est a ouverture sur hausse. La commande peut etre utilisee soit comme limiteur a minimum, soit comme limiteur a maximum. La commande est dotee de bornes speciales qui permettent de l’utiliser avec des circuits a basse tension et a millivolts (avec generateur a thermocouple) ainsi qu’avec les robinets a gaz et les charges motrices a la tension du reseau. LA PRESENTE COMMANDE DOIT ETRE INSTALLEE PAR UN TECHNICIEN QUALIFIE. Ne depassez pas les charges nominales. Tout le cablage doit etre conforme aux codes et reglements locaux et nationaux qui regissent les installations electriques. Cette commande ...