Cal-Stat Thermostats

• Do not expose Cal-stat unit to more than 100 degrees Fahrenheit (56 degrees Celsius) above set point temperature.
  
  
• On 1/2" and 5/8" diameter Cal-Stats, do not turn adjusting screw more than 7 revolutions in either direction from room temp.
  
  
• On 1/4" dia. Cal-Stats, do not turn screw more than 1/4 revolution in either direction from room temperature without checking temperature set point.
  
  
• Removal of adjusting screw may also render Cal-stat inoperative.
  
  
• If it is necessary to reduce the temperature setting in a heated system, do not turn adjusting screw more than one revolution or 100 degrees Fahrenheit temperature drop at any one time.
  
  
• Do not exceed the amperage rating shown on Cal-stat shell. The maximum amperage rating for the Cal-stats are listed under the engineering specifications.
  
  
• Optimum performance will result when the amperage load is half of the maximum rating. Improved performance will result when a contactor is used to control the load and the Cal-stat is wired through the holding coil of the contactor.
  
  
• System vibration can cause contact bounce. The addition of a capacitor will reduce the bouncing and overshooting. The typical recommended capacitor is 0.1 microfarad, rated at a minimum of 600 VDC for 120 VAC circuits and a minimum of 1000 VDC for 240 VAC circuits. The capacitor should be wired in parallel across the leads of the Cal-stat.
  
  
• Proper hole sizing for the Cal-stat is extremely important to avoid restricting shell expansion during operation and at the same time maintaining proper fit for the best temperature control. For the best temperature control, the reamed hole sizes required are, (1/4" dia. models= .250" diameter hole), (1/2" dia. models= .500" diameter hole), (5/8" dia. models= .625" diameter hole).
  
  
• Do not seal lead end of Cal-stat with silicone sealant materials such as oils, caulking or grease.
  
  
• Do not distort the Cal-stat shell.

1. Connect test light or other device suitable for determining on-off continuity of Cal-stat control.

2. Procedure for setting all 1/2" diameter and 5/8" diameter Cal-stats:

2.1 Install Cal-stat in media to be controlled.

2.2 Allow the temperature of the media to increase 10 to 20° F (5.6 to 11.1° C) above your required temperature set point by turning the adjusting screw counter clockwise. The adjustment rate is approximately 90° F (50° C) per a revolution of the screw for the 5/8" dia. Cal-stat. and approx. 120° F (67° C) per revolution for the 1/2" dia. Cal-stat. Allow media to stabilize each time the Cal-stat temperature is set.

2.3 Turn adjusting screw clockwise in small increments until desired control temperature set point is reached.

2.4 Cal-stat is now set.

2.5 If an over adjustment is made during step 2.3 or if a readjustment is required, restart at step 2.2 and repeat the procedure. Remember that all readjustments must be made by turning the adjusting screw clockwise to reach the desired set point.

3. Procedure for setting 1/4" diameter Cal-stats:

3.1 Install Cal-stat in media to be controlled.

3.2 Allow the temperature of the media to increase 10 to 20° F (5.6 to 11.1° C) above your required temperature set point by turning the adjusting screw clockwise. Do not turn adjusting screw more than 1/4 revolution in either direction from room temperature without checking set point temperature. Adjusting rate is approx. 700° F per revolution. Allow media to stabilize each time the Cal-stat temperature is set.

3.3 Turn adjusting screw counterclockwise in small increments until desired control temperature set point is reached.

3.4 Cal-stat is now set.

3.5 If an over adjustment is made during step 3.3 or if a readjustment is required, restart at step 3.2 and repeat the procedure. Remember that all readjustments must be made by turning the adjusting screw counterclockwise to reach the desired set point. 4. Cal-stats may be subject to a small amount of temperature set point drift after a few cycles depending on the application load, cycling frequency, and vibration. Check the set point and readjust after approximately 100 cycles under load to improve performance.

1. DO NOT apply excessive torque to the threaded mounting fittings as a resulting change in temperature may occur

2. Maximum torque values without Teflon thread:

1/4" Models: 10 ft-lbs (13.5 N-m)
1/2" Models: 20 ft-lbs (27.5 N-m)
5/8" Models: 35 ft-lbs (47.5 N-m)


3. Maximum torque values with Teflon thread:

1/4" Models: 1.1 ft-lbs (1.5 N-m)
1/2" Models: 2.2 ft-lbs (3.1 N-m)
5/8" Models: 4.0 ft-lbs (5.4 N-m)