Assessments - 3, GPA: 3.3
(
)
)
|
Facilidade de uso
Principle of Operation — Control action of these thermostats is provided through the principle of liquid volume change. With a variation in temperature, the liquid in the sensing bulb expands or contracts, causing a bellows to actuate the switching mechanism. Note: In Inverse-Action Thermostats, contacts close on temperature rise. Housing — The control housing and cover assembly is of heavy- gage sheet metal on NEMA-I models. Moisture resistant (LT) models have housing and cover assembly made of heavy gage cast aluminum. Power Supply — WARNING: Use on AC only. Thermostat is not DC rated. Control Range — The following temperature ranges are available: Fahrenheit 60 to 250 200 to 550 Note: This control does not have an “OFF” position. Process Temperature Differential — May be minimized by: 1. Make sure control is mounted to vertical surface. (See Step 1, MOUNTING section) 2. Avoid excess cooling capacity. 3. Locate control sensing bulb in optimum position between cooling source and work. Packing Glands — If a sealed or leak-proof connection is required at the point where the capillary enters the oven, tank, pipe or similar equipment, an appropriate packing gland is available as an optional part. (Models CCF-25A, CCF-25D or CCF-25E) CAUTION: Not for use in hazardous environments as described in National Electrical Code. Failure to comply can result in explosion or fire. MOUNTING Note: Do not mount control where it will be subject to vibration, shock, grease, dust, lint or corrosive vapors. Do not mount adjacent to a large magnetic contactor, as vibration and shock will cause thermostat to interact erratically — resulting in chattering of the contactor. The air temperature in and around the control enclosure should be kept as near to normal room temperature as possible... never above 150°F. Mounting Lugs(2) 2 / "7163 / "78Mounting Holes5 / " Dia.78/ " Dia.5165" Figure 2 NEMA-I Models LT Models 1. Thermostat must be mounted in a vertical position only. 2. Use sheet metal or wood screws through the mounting holes in baseplate to mount control. (See Figure 2) 3. For controlling platen or die temperatures, insert entire sensing bulb into drilled holes selected for snug slip fit. The longer, more sensitive Style 9 bulbs should be used for controlling air temperatures or pipe line heating. Note: If material in contact with bulb or capillary is corrosive, a protective well should be used. Protective wells are available as an optional part. Check Factory. 4. CAUTION — A. Bending or deforming sensing bulb will alter control calibration — requiring recalibration after installation. See CALIBRATION section, page 3. If necessary, Style 9 bulbs can be coiled to 1” I.D. (See Figure 3.) B. Do not kink capillary tube. The resulting constrictions in fluid flow can destroy control function or broaden temperature differential. Minimum capillary tube bending diameter is 1/2” I.D. (See Figure 4) Figure 3 (Sensing Bulb) Figure 4 (Capillary Tube) 1” Do Not Bend or Kink Crimped End 1/2” Rod C. Any deformations of bulb or capillary that result in leakage of fluid from control renders control inoperative. D. Avoid passing control capillary tube through zones whose temperature is in excess of controlled process temperature. Erratic control or destruction of control function may result. WIRING CAUTION: Hazard of Electrical Shock. Disconnect NEMA I Models: all power before wiring or servicing this control. A. Entrance for wiring is provided by two 1/2” conduit holes in Failure to comply can result in electrical shock or end of base plate. electrocution. B. Remove knob by lifting knob from shaft. (See Figure 6) C. Removal of the knob will reveal two mounting screws posi1. Electric wiring to heater must be installed in accordance with tioned under the knob. Remove screws and lift off cover. local and National Electrical Codes. WARNING: Use cop (See Figure 7). per conductors only. WIRING Figure 6 Figure 7 Figure 8 Figure 9 LT Models: A. Entrance for wiring is provided by two 3/4” NPT conduit holes in end of housing. Wiring to control housing should be in moisture-resistant conduit. B. Remove cover by removing four hexhead screwbolts. (See Figure 8 and 9) 2. Connect wires according to wiring diagrams (Figures 10 and PilotLightFigure 10 — Single phase loads when load does not exceed rating of thermostat. CALIBRATION Figure 12 ThermometerLoad (Tank, vat, die or platen) 11). Note: Electrical connections should be made with generous loops of wire — approximately 6” per lead. 3. Replace cover and tighten screws. 4. Replace dial knob. (NEMA-I models only). 5. Note: If load amperage or voltage rating exceeds switch rating, a contactor must be used. (See Figure 11) Contactors are available as an optional part. PilotLightFigure 11 — Single phase loads when load exceeds rating of thermostat and three phase loads. CAUTION: Hazard of Electric Shock. Extreme care should be exercised during calibration adjustments because of shock hazard due to exposed elec...