1.
Connect a meter capable of r/- 0.1 ohms to the NC and COM contacts.
2.
Measure the resistance. If the resistance is more than 1.0 ohm, remove the switch from service.
3.
Connect the meter to the NO and COM contacts.
4.
Cause a high-pressure fault condition using one of methods below:
NOTICE
Do not simulate fault conditions while the burner is firing.
• Turn the pressure switch set point clockwise until the switch trips.
• Pressurize the volume of gas the high-pressure gas switch is sensing by closing the downstream ball
valve and open the port 3 tap.
5.
When the fault occurs, measure the resistance. If the resistance is more than 1.0 ohm, remove the
switch from service.
6.
Allow the burner to go through a startup sequence, and then verify that the burner faults and is not
allowed to light.
7.
When testing is complete, close all test taps (ports), and then open downstream ball valve.
Service and maintenance
Global Finishing Solutions
35
239-062 rev 5
