CT SERIES BOILERS - Columbia Heating

Danfoss Operating Pressure ControlTesting While in Operation.1. Start the burner and allow the boiler pressure to rise to the main set point. Theburner should shut off.2. Open the steam valve and relieve pressure until the pressure is below the lowerset point. the burner should now start. The lower set point is determined by takingthe differential from the main set point.Testing while not in operation.1. To test operation of pressuretrols while unit is not in operation requires the useof an external source of pressure such as an air compressor.2. Close all valves and connect the pressure source to the boiler.3. Increase the pressure in the boiler until the pressure is higher than the setting onthe controller. The mercury switch should rock over such that continuity is nowbroken.4. Decrease the pressure in the boiler until the differential is satisfied. The mercuryswitch should rock back to a position that causes continuity to be made acrossthe switch.Danfoss Safety Limit Pressure ControlTesting while in operation.1. Adjust the safety limit set point below the main set point.2. Start the burner and allow the boiler pressure to rise to the safety limit pressurelevel.3. The burner should shut off and not restart until the manual reset lever isdepressed.Testing while not in operation.1. To test operation of pressuretrols while unit is not in operation requires the useof an external source of pressure such as an air compressor.2. Close all valves and connect the pressure source to the boiler.FM-148 COLUMBIA BOILER COMPANY, REV 6-06- 35 -