Taco SR502 zone relay board

Larry_10

my boiler is short cycleing i have buderus g115-28
i have a 2109 and 2 zones one baseboard and one hydro air

with 2 taco 007 on a sr502

how can i connect both pumps to work on the same t-stat
so i can put more of a load on my boiler

also dose a home owner have rights if a contractor over sizes my boiler for my house

thanks

Unknown

You can add

a jumper wire between the hot connectors going to each circulator in the relay . Although I'm not exactly following what you're trying to do Rooster ?

Chuckles_3

If you connect the 2 pumps to the same 110vac output of the Taco, they'll work at the same time. But then you don't need the Taco at all, if the boiler has an output to which you can connect both the pumps. If the zones need differnt run times, you won't be able to heat them equally if they are wired together.

I have a Taco 503 (three relays), and I set it up so that if zone 1 calls, both zones 1 and 2 will run, but if zone 2 calls, only zone 2 runs. This needs all three relays. I did this to reduce micro-loading (zone 2 is small) and the resulting short-cycling. It's not difficult, but you need a bit of hobby-level wiring experience.

Larry_10

thanks ron im trying to run both zones at once to stop the short cycle and to put a biger load on the boiler at one time im only doing this for now i ordered the 2107 controler but it wont be in for another 3 weeks

Larry_10

how about I do this take out the sr502

on my 2109 put terminal 61 and 63 and wire it to my 2 taco 007 together take my t-stat and put it on tt then flick my dip switch in the 2109 so my cerc pumps run for ten min after a call for heat
this way here im running a 50,000 btu load on a call for heat instead of 20 at a time

dose this should like it will work the pump draw less then a 1 amp each and I think the max on 61 and 63 is 5 amp so I should be fine

Joe Mattiello

2 pumps 1 thermostat

I don't know why the boiler is short cycling, but if you want to energize both pumps with 1 thermostat simply wire the TT terminals in a parallel
Taco, Inc.
Joe Mattiello
Technical Service Technician
joemat@taco-hvac.com
401-942-8000 X 484
www.taco-hvac.com

Larry_10

all set I made a pigtail on both pumps and put it on pump one with 1 t-stat and the boiler never reaches high limit so far.

but since I have hydro air I need to put a strap on aquastat on my coil so I don't get cold air when the boiler starts.

then I will dump the sr502 and put both pumps on my 2109 and connect them to 61 and 63 and put my t-stat on tt
so both my pumps can run 10 mins after a call for heat

thanks guys

Wayco Wayne_2

Sell them

a buffer tank. Longer cycles both on and off. WW

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Paul_28

How did you do that? Please show scematic.

Paul_28

How did you do that? Please show scematic