United Electric Controls 55HT Series Installation And Maintenance Instructions Manual
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GENERAL55 HT Series Thermostats are designed to control heattracing and freeze protection circuits. Temperature varia-tions are sensed by a liquid filled sensing bulb whichhydraulically transmits to a diaphragm which either actu-ates or deactuates a snap-acting switch at a predeter-mined set point.MAXIMUM TEMPERATURE IS THE HIGHESTTEMPERATURE TO WHICH A SENSING ELE-MENT MAY BE OCCASION- ALLY SUBJECTEDWITHOUT ADVERSELY AFFECTING SET POINT CALI-BRATION AND REPEATABILITY. MAXIMUM TEMPERA -TURE LIMITS STATED IN LITERATURE MUST NEVERBE EXCEEDED, EVEN BY SURGES IN THE SYSTEM.OCCASIONAL OPERATION OF UNIT UP TO MAX. TEM-PERATURE IS ACCEPTABLE (E.G. START-UP, TEST-ING). CONTINUOUS OPERATION SHOULD BERESTRICTED TO THE DESIGNATED ADJUSTABLERANGE.Tools NeededFlathead screwdriverMOUNTINGINSTALL UNIT WHERE SHOCK, VIBRATIONAND TEMPERATURE FLUCTUATIONS ARE MIN-IMAL. ORIENT UNIT SO THAT MOISTURE ISPREVENTED FROM ENTERING THE ENCLOSURE.Do not mount unit in ambient temperatures exceedingproduct specifications. 55 Series Thermostats can bemounted in any position.For remote sensing thermostats, mount the unit via the (2)3/16” screw clearance holes on the enclosure (SeeDimensions on back page.) Locate the bulb and 6” ofInstallation andMaintenance InstructionsIM55HTPlease read all instructional literature carefully and thoroughly before starting. Refer to the final page for the listing of RecommendedPractices, Liabilities and Warranties.55HT SeriesThermostats for Heat Tracingand Freeze Protection Applications inOrdinaryLocationsType E55HTPart I - InstallationPart I - Installationcapillary in the area that is exposed to the coldest tempera-ture. Be sure to locate the bulb so that it will not beexposed to temperatures beyond sensor exposure limits.Avoid bending or coiling the capillary tube smaller than1/2” radius. Exercise caution when making bends near thecapillary ends.For ambient sensing thermostats, locate the unit in areathat is exposed to coldest temperature.WIRINGDISCONNECT ALL SUPPLY CIRCUITS BEFOREWIRING UNIT. ELECTRICAL RATINGS STATEDIN LITERATURE AND NAMEPLATES MUST NOTBE EXCEEDED. OVERLOAD ON A SWITCH CANCAUSE FAILURE ON THE FIRST CYCLE. WIRE UNITSACCORDING TO NATIONAL AND LOCAL ELECTRICALCODES. RECOMMENDED WIRE SIZE IS 14 AWG.Remove the four screws retaining the cover and cover gasket.Connect conduit to the 1/2” NPT connection located on theside of the enclosure. Wire directly to the switch terminalsaccording to local and national electrical codes. The threeswitch terminals are clearly labeled “common”, “normopen”, and “norm closed”.Start-Up ProcessTurn dial and knob to the desired temperature setting.Thermostat is ready for operation.U N I T E D E L E C T R I CC O N T R O L S |
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