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Author:
tomtomtomtom (MA)
Hi,
Have a Alpine gas condensing boiler...Taco SR504-4 relay with 4 zone circulating pumps. I have added a 5th zone and have a SR501-4 hooked to the 5th pump....works fine.
Here is my issue...I hooked the TT of the new relay to the end 2 connectors in the 4 zone relay (that goes to the TT of the boiler). It seems to work ok when just the new pump is on...pump circulates and boiler is activated to go from standby to running. When one of the original 4 zones calls for heat, the boiler goes through the whole startup sequence (purging ect..) and both run fine.
There must be something going on that a signal to restart occurs from the 4 zone relay. Do you think that the 2 relays are not compatible (when the different individual pumps on the 4 relay are on, there is no restarting sequence)? Should I run a new TT wire directly to the boiler to avoid the 4 relay? I'm afraid that the continual extra restart is no good for the boiler....any advice is appreciated.
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Author:
packy (MA)
if the end switch from the 4 zone relay connects to TT on the boiler then it makes no difference if the TT from the 1 zone connects to the 4 zone end switch or to TT on the boiler. either relay simply calls the boiler on.
try reversing the TT from the 1 zone.
just a small town plumber making a guess....
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Author:
tomtomtomtom (MA)
I tried that...either way, when the new zone on and any zone on the 504 comes on it recycles. I'm going to try connecting directly from 501 TT to the TT connection in boiler but doubt that will make any difference...connection at end switch is same as going at boiler (I think).
I have read that to join them you need a 501EXP and a 504exp rather than a straight 501/504...but I'm still trying.
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Author:
Paul48 (CT)
I'm no sparky, but I wonder if you flip-flopped the polarity with the 501? I would bet that connecting 2 independant line to the TT on the boiler will fix the problem. Or you could try flip-flopping the wires on the 501.
Edited 3 times.
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Author:
tomtomtomtom (MA)
I'll try that and will report back
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Author:
packy (MA)
tomtom, the end switch ( 5-6) from the 501 connects to either the end switch of the 504 or TT on the boiler.
TT on the 501 is for your thermostat.
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Author:
Paul48 (CT)
You're right packy...I missed that completely.
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Author:
tomtomtomtom (MA)
...Sorry,I miss-spoke...I realize the TT on the 501 is the thermostat...I meant to say that the #5 and #6 terminal goes to the TT...Those are the ones that I'm sending to the boiler....along with the end switch from the 504.
Right now, I believe that when the 501 sends a signal to the boiler, it cold starts it. Whenever the 504 calls for heat the end switch sends a similar signal as the 501 to cold start.
I'm trying to figure a way that there won't be duplicate cold starts from both relays.
The easiest fix would be to get a 506...but they are pricy and a lot of needless rewiring.
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Author:
packy (MA)
it should make no difference. 5-6 terminals are simply a switch. like turning on a light in the bathroom.
in the old days before multizone relays the 5-6 from many R-845A relays were all connected together..
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Author:
Paul48 (CT)
The 5,6 terminals and the end switch are just dry contacts. When a t-stat attached to either the 501 or 504 call for heat, the contacts close and pass 24v supplied by the boiler. How are you determining the boiler is restarting? Is it actually shutting down?
[www.taco-hvac.com]
Edited 1 times.
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Author:
tomtomtomtom (MA)
I realize that the end is basically like any switch....
I watch the Readout on the Alpine diagnostics screen...when the 501 controlled pump is running and the Alpine starts....Alpine goes through all the initiating cycles.. prepurge, etc..cycles and then reads "running"..temp goes up....all is good.
If I then turn on a zone controlled by the 504....Alpine immediately stops and starts the initiating cycles as if it were in standby/cold start...goes through all the warm up steps (as above) and then both are running ok. When another pump on the 504 comes on, there is no further restart.
I am beginning to think that I need Taco "exp" (504-exp and 501-exp) relays to avoid the double startups.If that is the case, I'll just throw a 506 to replace both.
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