ReplyDefective float switch or wired wrong.
Did you remove it and ohm it or use a co timidity tester to ensure it breaks continuity when tripped?
Regular Guest
Hello all, Just went out to look at a unit due to condensate overflow. Making a long story short; the unit did not have a float switch installed. After making several corrections to the drain line I installed a F/S and attempted to trip it with no success. Seems the condensate level rises in housing with the switch removed (positive pressure unit) but when the switch is reinstalled the level goes back down. I confirmed this by sealing off the opening of the T with a clear piece of plastic. Any ideas what might be causing this?
Professional Member*
Defective float switch or wired wrong.
Did you remove it and ohm it or use a co timidity tester to ensure it breaks continuity when tripped?
Regular Guest
Red from the AH transformer to Red from Stat? inline fuse?
Professional Member*
You really should call a professional!
Regular Guest
Funny...............I've been working in HVAC since 93 so I know just a little about wiring a float switch.Originally Posted by pecmsg
Re-read the post. With the float switch installed in the housing the condensate level in the housing will not rise. Like it's air locked. With the switch removed from the housing the water level rises. The switch wiring isn't the issue. Water will not flow into the housing to raise the float to open the circuit when the switch is installed in the housing.
Professional Member*
Since 93 why are you killing ALL control voltage? That can be dangerous in the winter b
Regular Guest
Are you against float switches?
Professional Member*
If you have a non-codensing furnace maybe just just break the outdoor condenser low-voltage (usually yellow) if you don't want to risk breaking heat in the winter.
Banned
What brand and MN# of float sw do you have??
Regular Guest
Little Giant ACS-4.
Global Moderator
.
Regular Guest
Thanks NETWizz but the wiring is perfectly fine; no worries there. One of the members posts from yesterday has gotten this way off topic by assuming too much. The question still remains - Has anyone ever experienced a float switch housing not filling with condensate with the float switch installed? With the float switch pulled out of the housing the condensate will fill it up. As soon as the switch is reinstalled the condensate level drops back down. I've confirmed this by placing a piece of plastic wrap over the opening and seeing it retreat back into the unit. It appears that the internal positive pressure is the only thing that is allowing the condensate to travel into the float switch housing. Once that air flow is shut off the condensate flows back into the unit. The air handler is "pitched" enough that drainage should not be a problem.
Global Moderator
Which configuration are you using and on which drain hole ?
Regular Guest
It's the last configuration (#3) at the bottom of the page you attached.
It's installed in the reduced opening drain port.
The original "installer" had piped the main condensate drain into the float port and never installed any type of float switch. The main drain port had been plugged since day one. It had been that way ever since the unit was installed. This obviously kept the primary internal pan on verge of overflow all the time.
Professional Member*
Did you vent the drain line properly? No where for the air to go but get trapped at the highest point if you did not.
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Regular Guest
Yes, drain line is vented correctly.
Regular Guest
Forgive my crude rendering but this a representation of what's going on in the float housing.
Professional Member*
If this is an overflow port only, just a safety capped off. If the water is running down the primary pipe and the switch installed correctly, as long as water is not backed up isn’t it working correctly. When water backs up it will “flood” the tee and trip. Are you making it flood as if primary is stopped up? When you take it out the pressure is pushing water toward the open tee. I use a switch just like this one and have had little problems. Most problem I see is too high static. Sounds like it may be working, flood it and see, or/and install the wet switch and be done.
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