White Rodgers 5A75 Installation Instructions Manual

Contents

installation instructions

WHITE-RODGERS DIVISIONEMERSON ELECTRIC CO.9797 REAVIS RD., ST. LOUIS, MO. 63123(314) 577-1300, FAX (314) 577-15179999 HWY. 48, MARKHAM, ONT. L3P 3J3(905) 475-4653, FAX (905) 475-4625WHITE-RODGERSFAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLYBEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSEPERSONAL INJURY AND/OR PROPERTY DAMAGE.The White-Rodgers combination warm air limit and singlespeed fan control combines into one compact case, a switchwhich controls the fan or blower operation and also a switchwhich acts as a safety limit control.The fan switch is designed to control blower operation. It willstart the fan circulating warm air when the bonnet temperaturereaches the pre-determined temperature setting; stopping thefan and when the bonnet temperature falls below the pre-determined setting.The warm air limit switch is designed to act as a safety switchwhich automatically shuts off the burner when the furnacetemperature reaches a dangerously high point, regardless ofthe cause.The limit switch of these controls has special contacts which aresuitable for use on low voltage and millivolt (thermocouplegenerator type) circuits as well as line voltage equipment suchas gas valves, oil burner motors, etc.Printed in U.S.A.DESCRIPTIONTHESE CONTROLS MUST BE INSTALLED BY A QUALIFIEDINSTALLER.Do not exceed the specification ratings.All wiring must conform to local and national electrical codes andordinances.This control is a precision instrument, and should be handledcarefully. Rough handling or distorting components could causethe control to malfunction.This control has been accurately calibrated at the factory. anyattempt to calibrate this control will void the White-Rodgerswarranty.WARNINGDo not use on circuits exceeding specified volt-age. Higher voltage will damage control and couldcause shock or fire hazard.CAUTIONTo prevent electrical shock and/or equipment damage,disconnect electric power to system at main fuse orcircuit breaker box until installation is complete.PRECAUTIONSIf the furnace manufacturer has made provision for, or recom-mendations for location of this control, then follow those instruc-tions. If not, the following suggestions should be observed.The temperature sensitive bulbs should be positioned in thefurnace bonnet so that they will be located in the area which issubjected to the most rapid temperature changes.Avoid locations where there may be dead air spots or stratifica-tion affecting free air circulation. Corners, sharp turns, baffles orother obstructions usually cause these conditions. Do not locatethe control elements where the air-flow from the bonnet into anysingle duct will control its operation.INSTALLATIONOperator: Save these instructions for future use!PART NO. 37-0874CReplaces 37-0874-1 & 37-90989549TYPE 5A75FAN & LIMIT CONTROLINSTALLATION INSTRUCTIONS