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I have a honeywell PA404A pressure control switch on my home gas steam heating system. I'm having a problem with the switch turning off the system. It will only come back on if I turn the top screw all the way out, then back down to approx 5psi. At this point the heat will turn on but when the thermostat shuts down the system it will not turn back on when calling for heat unless I adjust the screw again. Also, the switch will only turn on the system when set at 5 on the dial on the inside. Any ideas? Thanks, Crai

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This may be caused by accumulation of sludge in the steam trap (the looped tube that connects the pressuretrol unit to the boiler). the sludge restricts the pressure from reaching the diaphragm in the pressuretrol unit. So it gets a false reading. Clean or replace the tube and see if normal function resumes.

Posted on Dec 07, 2009

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Here's a link that may help it explains the controller and how it works. http://customer.honeywell.com/techlit/pdf/PackedLit/60-2341.pdf I personnally would not be adjusting this control as you have been because its a safety that shut off the unit in a unsafe condition. If it's malfunctioning then thaat is when you need to call a service company to check out why. You would not want your unitto explode because of a high pressure condition. Please have your unit serviced.

Posted on Jan 06, 2009

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WHATS WRONG WHEN THE GAS DOES NOT COME OUT TO BE IGNITED IN A COLEMAN HEAT AND AIR UNIT.


There are several issues that may cause this. I would have you check that you are getting 24 volts to the gas valve when you call for heating.
Things that may cause you not to have 24 volts:
1. Does the draft inducer motor start when you call for heating?
2. Does the pressure switch close after the draft motor starts?
3. Do you get 24 volts after the pressure switch closes.
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Air pressure switch is closed before the ignition sequence causing the boiler not to ignite can you advise solution


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


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1 Answer

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http://johnstonesupply9.com/TechDocs/Amana/Package%20Units%20Gas-Electric/PGD%20Pkg%20Gas%20Ele/PGD%20Tech%20Info.pdf

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