TM 5-3895-374-24-21.10.WEffective: February 1992FENWALTHERMOSWITCH®Temperature ControllerInstallation InstructionsATTENTION: To ensure safe and proper performance,read these instructions carefully before attempting toinstall or operate this Fenwal product. Please retain forfuture reference.The shell of each THERMOSWITCH® Controllercontains the catalog number, the current rating, thetemperature range, and the contact arrangement.Controllers that are component recognized or listed byUnderwriter's Laboratories or certified by the CanadianStandards Association (CSA) will also bear the symbol ofthe approving agency. In addition, UL componentrecognized units may have a "4" as the first digit of theCatalog Number.The fifth digit of the catalog number describes whethercontacts open or close on temperature rise. If contactsopen on temperature rise, the fifth digit of the number isan even number (17000, 17002, etc.). If contacts closeon temperature rise, the fifth digit is an odd number(17021, 17023, etc.).If the fourth digit is "2" or 7" (e.g., 17021, 17071), thecontroller is compression operated. Compression unitsthat close on temperature rise are recommended if over-ranging is anticipated. Low temperature units [-100 to+400°F (-73 to +2040C)] can be over-ranged to 500°F(2600C) and high temperature units [-100 to +600°F (-73to + 316°C)] over-ranged to 700°F for intervals notexceeding one hour.INSTALLATIONMOUNTINGTHERMOSWITCH Controllers are supplied in five basichead configurations - Cartridge, Block Head, Hex Head,Coupling Head and Circular Flange. See Figure 1.To avoid restricting shell expansion when makinginstallations in solid metal blocks, a 0.625 in diameterreamed hole for 5/8 in standard units or a 0.812 indiameter reamed hole for 13/16 in heavy duty units isrecommended. See the following specific controller stylelisting for additional installation instructions.Figure 1Cartridge (Style 1)- Hole should have a short spline toreceive the 0.125 in diameter locating pin. This prevents theunit from rotating when the adjusting sleeve is turned. Thecartridge style may be used for surface control if insertedinto a Fenwal surface mounting well (Cat. No. 11100-2).Block Head (Style 2)- Mounted in a similar manner to thecartridge type. If the unit is to be inserted into a reamedhole, mount two short pins on either side of the hole. Thepins should rest against the sides of the block head toprevent rotation of the unit.Hex and Coupling Head (Styles 3 and 4)- Installed likeany pipe fitting. If installed in a pipe tee, the tee should belarge enough to allow adequate circulation of the fluidaround the temperature-sensitive section of the controller.See Table 1 for maximum torque values.page 3 - 1149
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