Help with Tjernlund Powervent please

Mark_25

I have an SS1 powervent, and it's giving me fits. I used to have the VSI controller send a call for heat to the SS1, then the SS1 would call the boiler T-T when it proved, but I found the SS1 was running ALL the time (because the boiler is sized larger than the radiation, it would reach 190F and the aquastat would shut it down until 160F was reached). So, in the interest of saving the motor on the SS1 from premature burnout from running constantly, I rewired the system to the following: VSI controller calls the boiler Aquastat for heat, the B1 terminal on the Aquastat runs over to the SS1 and from there back to the burner. This is straight out of the Tjernlund manual for wiring with an aquastat. The SS1 is wired correctly, with B1 on terminal 1, neutral on 2, and terminal 4 going back to the burner. When this fails, LED 4 blinks twice, which is "prover is electrically closed when starting" Since the blower isn't running, I don't know how the prover can be closed. The ONLY way I can get the SS1 to come on, is if the power switch on the front of the boiler is shut off, call for heat comes on from the VSI controller, then I flip the switch on the boiler. Then I get the SS1 and the boiler coming on at the same time.

Anybody got any ideas here?

Robert O'Connor_6

They

had a bunch of bad boards . Call them and make sure you got a good version.

Best regards.

Robert

Rudy

wiring power ventor

Is the motor and transformer on the same power feed? The old ventors would back feed about 20 volts to the timer that would keep the ventor running all the time. I would follow the wiring diagram to the last wire. If you wire it their way and it works (but runs alot) see what is differant and how it changes things. ONE WIRE is all it takes. The ventors are made to run alot. That is what they do but the boiler could be adjusted to change things alittle.

Mark_25

The powervent and boiler are on two different breakers, as they are each requiring 15A. The only voltage I could find was when everything was off, the B1 and neutral running to the powervent had 1.1 Volts between them. I've checked and double checked the wiring, and it's right to the letter. I also checked the version of the board, it's the X.04 version that's supposed to be the updated one. This was purchased about the beginning of the year, so it's pretty new. I did get it to act normally by bypassing the prover switch (dip sw 9) check on startup. Not the way I want to run though. Also, I pulled the prover switch contacts and found no continuity across it when the venter is off. It shouldn't be causing a problem. I don't know what else to do. The thing worked properly when wired with dry contacts, but it ran too often.

Richard D._2

Do you

by chance happen to have a Carlin Cad cell relay on that job??If so the Carlin will back feed about 32.4v while off.It is a self checking controll and that is what it does...The back feed will keep the fan running...It has happened to me before... Good luck and next call bring a BIGGER HAMMER .. Richard

Mark_25

Nope, Beckett AFG. The only thing I've got left to try is go into the burner control, and go to the powervent with just the motor leads.

bob_32

powerventer

have you checked the pre purge and post purge time delay?
u can adjust yourself to cut down run time.

Mark_25

Pre-purge is set at 5 seconds, and post purge at 2 minutes, but the problem is NOT that it's running too long, it's that it's faulting out. The control says that the prover switch is closed when it's starting, even though I checked the prover switch and it's fine. Supposedly it's got the new board in it.

Mark_25

Ran across a message from Chris Messerschmidt at Tjernlund

Doing a search on the wall, I found a message from a Chris Messerschmidt at Tjernlund, which explained what was going on with the powervent. I do believe I have had high winds the last few times I had this problem, and Chris explained that high lateral winds across the vent terminus can cause a natural draft in the system that shows as a prover closed at startup. Deactivating the switch 9 was the factory fix for this, and it appears I had the good board, but produced prior to the January fix. Problem solved. Thanks again Wallies!

Mark_25

duplicate

duplicate post deleted

Chris Messerschmidt

Tech From Tjernlund Products Inc.

I have read the replies to this thread and most seem to have the #4 LED flash twice. Which means prover closed upon startup. Now since the setpoint on the proving switch is a -.04 which is pretty light, if there is any winds comeing across the terminus of that unit (only SS1)it can sometimes pull the prover in. Now if you get a call for heat while this is happening you will get the #4 to flash twice and give you that fault. Since this problem has come up all SS1's that leave the factory here will have the #9 dipswitch in the up position. (up is away from the numbers) If you do not have the #9 in the up position and you are haveing that fault come up, flip the #9 up and the problem should go away. If any of you have any further questions feel free to email me (cmesserschmidt@tjfans.com) or give me a call 1-800-255-4208 ext 142, names Chris.