Course: HET 273 - Pneumatic, Electric and DDC Automation - Spring 2015

Lab Assignment

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Unit 7 Lab Assignment

Recommended Materials

1. Lab Sheet
2. Pencil and Paper
3. Pneumatic thermostat – Direct acting, bleed type
4. Calibration kit (Includes pressure gage, hypodermic reading, poly, thermostatic screwdriver)

Scope

This lab will help the student to understand how pneumatic thermostats operate and calibrate.

Procedures

1. The instructor will give you the supplies needed for this lab
2. Read manufacture calibrator instructions
3. Connect thermostat to 20 psi supply
4. Connect thermostat branch 8 to 13 actuator
5. Calibrate to manufacture’s recommendations
6. Turn thermostat 5 degrees below room temp

Research Questions

1. What was the branch line midpoint?
2. After calibration, what happened to actuator when thermostat was turned down 5 degrees?