Hello all, happy holidays! I am currently adding a zone using a circulator on my Burnham boiler with a Reillo burner. I have three zones now, all using independent circulators. I have 3 Honeywell RA89A switching relays that allow me to use 24v thermostats instead of line voltage thermostats. One relay for each zone. The first relay which controls the downstairs heat has an additional piece of bx wire going to the aquastat on the boiler. The aquastat is a Honeywell L4081B dual aquastat. I want to replace all three relays with a Taco SR504 4 zone multi zone relay. The extra 4th zone of the relay will allow me to have my 4th new zone on its own thermostat which is what I want. I know how to wire the 4 circulators to the new SR504 relay, pretty straightfoward, and I know how to wire the 4 thermostats, straightfoward as well. I have no idea how to hook this thing up properly to the aquastat. I’ve looked at the wiring instructions it came with, but it just confuses me. I cant find any info about wiring the aquastat online. Can any of you help me? I’ve tried some of the other forums online but they misunderstood me and thought I meant I was using zone valves not circulators, I reposted but no one replied. i need to get this done soon. Please help, and a wiring diagram would be appreciated if possible.
Craig
Replies
The terminals with the X X are for the T T on the aqustat. If you have a tankless coil on the boiler to produce domestic hot water, remove the jumper between ZC & ZR and connect these to the same(ZC to ZC & ZR to ZR) in the aquastat and leave the X X blank.
I took the cover off my aquastat and there are the following connections at the top are two connections where you just push the stripped wire into it (like a quick connect type fitting) they are both labeled "R". There is a black wire pushed into one and a red wire pushed into the other. There is another push in type connector, it is labeled "W" and a green wire is pushed into that. The other push in connector is labeled "B" and a black wire is pushed into that, and that black wire is spliced to the black wire of the burner motor. The red, black and green wires come into the aquastats housing via a bx cable. There is also a white wire which is spliced to the white wire of the burner motor.The bx cable runs to a White Rodgers relay. Inside the relay, the green wire is spliced to the black wire of my downstairs circulator, The red wire goes to a screw terminal marked #3 in the middle of the relays circuit board, the black wire goes to a terminal marked #1 which is a little above the #3 terminal and is also spliced with a black wire which is the line voltage coming in. All the white wires are connected together on two screws at the top of the circuit board and they both are marked #2. The model # of the White Rodgers relay is Type 829A-832. HELP!!!!!!! I do have a tankless coil for domestic water.
Craig
Edited 12/19/2007 8:29 pm ET by Craigabooey
Very likely the aquastat cover will have a diagram inside it. You need to understand the function of the aquastat and it's part in the sequence, then the diagram will make some sense.
Telling us that wires goes to numbered terminals on a certain relay is pretty much useless info unless we have a diagram to accompany it.
Ed
could you explain a little further? How would you wire up the Taco SR504 relay to this system. I have no idea how to post a diagram on here. Please I'm totally lost here. The diagram on the back of the aquastats cover shows a line going from terminal "R" to terminal "W" and reads "circ close on temp. inc." . The other "R" terminal goes to terminal "B" and reads "Hi Limit open on temp. inc." Thats it. HELP!!
Craig
"circ close on temp. inc."
When the boiler water reaches temp, a circulator (or whatever is connected) will turn on via this contact
"Hi Limit open on temp. inc."
When the boiler water gets too hot, or reaches a prescribed upper limit, the burner will shut off via this contact
Edited 12/20/2007 6:11 am ET by edlee
It seems to be on the Honey obsolete list.
Old for sure here's the wiring diagram and info.
Looks like the thermostat connections are X X to T T where where the relays are connected now. follow the bx cable and look for T T terminals
The wire from the burner motor has only 2 wires in the bx- black and white. There are no "T T" terminal markings anywhere. can you tell by the wiring diagram of the Honeywell aquastat (thanks for finding that by the way) how I should wire it with the Taco SR504? This is probably so obvious for an experienced oil burner guy, and I'm great with residential wiring, but all these relays and aquastats have me stumped. I need someone to say put the black wire there and the red wire there and you're goood to go. Thanks for answering me and being patient.
Craig
Relax and look over the pdf document @ fig . 8 and find the TT terminals they are on your primary control at the burner.
how old is this? what kind of boiler and when does it get serviced?
Its a Burnham cast iron boiler, with a Reillo burner. Its only about 6 years old. Its serviced once a year, or more if I have a problem. I never really do (knock on wood). I'm not sure if they put a new aquastat in when they swapped out my old boiler or if they reused the old one. I was surprised when you said the aquastat was old. It looks brand new.
To save you a problem with other parts of the system, the burner electrical, call your service to wire to the Riello burner.
The Riello burner has a delicate printed circuit board controller.