White Rodgers 11A79-2 Installation Instructions
Contents
1. F against indicator 4 Re tighten stop screw E Setting stop higher than control being replaced could cause personal injury and or property dam age2. WHITE RODGERS 11A79 2 Direct Immersion Hot Water Control INSTALLATION INSTRUCTIONS Operator Save these instructions for future use FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND OR PROPERTY DAMAGE This control is designed for use on hot water heating systems It has a coiled element that is immersed directly into the boiler water This feature gives an unusual speed of response to rapid changes of water temperature thereby preventing thermal lag THIS CONTROL MUST BE INSTALLED BY A QUALI FIED 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 compo nents 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 To prevent electrical shock and or equipment damage disconnect electric power to system at main fuse or circuit breaker box until installation is complete If the boiler manufacturer recommends a control location follow such recommendations If none is offered the following information gives suggested locations For high limit service the control should be located in the hottest part of the boiler This is usually a
3. applica tions On circulator applications the movable indicator points to the temperature at which the circulator will start On combination low limit and circulator applications the movable indicator points to the temperature at which the low limit will stop the burner and permit the circulator to run This control has a single pole double throw snap action switch The top left hand terminal red is the common terminal The top right hand terminal blue has open on rise switch action The bottom center terminal white has close on rise switch action Limit Control When used as either a high limit control or alow limit control use the open on rise terminals red and blue Circulator Control When used as a circulator control use the close on rise terminals red and white Combination Low Limit and Circulator Control For this application all three terminals are used The following wiring diagram shows atypical circuit for an oil fired system with domestic hot water without storage tank Thermostat Combination Low Limit Circulator Control Relay Type 809A 189 120V Neutral circulator operate If boiler water temperature drops too low the circulator will stop until the temperature rises in boiler CONTROLS WITH ADJUSTABLE STOPS 1 Loosen stop screw E with enclosed wrench 2 Setdial to original equipment manufacturer s specifi cation 3 Without moving the dial move stop tab
4. suggested for low limit service When tightening the control into the boiler care should be taken to apply all leverage to the hexagonal nut only to avoid damage to the diaphragm or control mechanism PART NO 37 1022B Replaces 37 1022 A 9520 All wiring should be done according to local and national electrical codes Common i Open on rise of temperature Close on rise of temperature If the boiler or burner manufacturer recommends a wiring diagram then follow such recommendations If none are offered the instruction sheet for the primary control gas valve or oil burner control may offer some suggested circuits Line Voltage Oil Burner Control Ignition Transformer The low limit side of the low limit circulator control main tains domestic hot water temperature all year around When the room thermostat calls for heat the burner and SETTING THE CONTROL 1 Use a screwdriver in the adjusting slot A on the front of the control to turn the dial so the fixed indicator B points to the lowest temperature of the cycle 2 Turn the differential adjusting screw C until the movable indicator D points to the highest tempera ture of the cycle B Fixed indicator cut in point C Differential adjusting screw D Movable indicator cut out point E Stop screw The movable indicator points to the temperature at which the contacts open on high limit and low limit
5. t the top of the boiler A high limit control should not be located in the section of the boiler that contains the heat exchanger that supplies domestic hot water For low limit or operating service the control should be located so that it responds to the temperature of the section of the boiler that heats domestic hot water HM WHITE RODGERS DIVISION EMERSON ELECTRIC CO 9797 REAVIS ROAD EMERSON ST LOUIS MISSOURI 63123 5398 Printed in U S A DESCRIPTION This control has single pole double throw switch action offering terminals that have open on rise switch action as well as close on rise switch action It may be used as a high limit control low limit control circulator control or as a combination low limit and circulator control PRECAUTIONS Shut off main gas to heating system until installa tion is complete Label all wires prior to disconnection when ser vicing controls Wiring errors can cause improper and dangerous operation Following installation or replacement follow ap pliance manufacturer s recommended installa tion and or service instructions to insure proper operation Do not use on circuits exceeding specified volt age Higher voltage will damage control and could cause shock or fire hazard INSTALLATION When used as a circulator control it may be located near the boiler outlet or riser When used as a combination low limit and circulator control it should be located the same as
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