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Discussion Starter · #1 ·
Hi All
I need help wiring a second heating zone.
The system is a peerless gas boiler controlled by a Honeywell L8148E aquastat.
When the primary zone thermostat calls for heat it turns on the boiler and the circulator.
The second zone was wired through a relay which only turns on the circulator when its thermostat calls for heat.
This is a cold start boiler so it is possible for zone 2 to call for heat and wind up pumping cold water.

I know I need another relay so I can move zone 1 circulator control out of the aquastat, but I cant figure out how to connect both t-stats to the aquastat so the boiler will start when either t-stat asks for heat, but not back feed to the other relay and kick on the other circ.

Any help would be appreciated.
Thanks in advance
Ralph.
 

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On my boiler I use a taco 3 zone switching relay recommended by Beenthere. This switch controls everything. Don't know if it will work for you. Beenthere help me set mine up about 4 years ago. Everything still working fine.

Please post some pictures of your boiler setup. Thanks.

Please wait for the hvac techs to respond.




http://s3.supplyhouse.com/manuals/1351150925280/85270_PROD_FILE.pdf
 

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Discussion Starter · #6 ·
Hi supers05
thank for the help
the diagram isn't very clear
there is a transformer in the aqua-stat that turns on the boiler and the circ. for zone 1, and a transformer in zone 2's relay switch which just turns on zone 2 circ., which one is the existing low voltage circuit

I'm old and been out of school a long time
 

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Discussion Starter · #9 ·
Hi Beenthere
I was looking at the TACO 2 zone switching relay as suggested above.
I'm a little confused as to where the low voltage comes from.

Is it from the T T connection on the Aqua-stat? or do I need a separate external transformer?

Ralph
 

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The panel has its own transformer built into it. It provides the 24 volts to the thermostats. The end switch is what gets connected to the TT terminals of your aquastat.
 
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Discussion Starter · #12 ·
Hi Beenthere
Just came from my sons house where I'm working on the 2 zones. Both t-stats have a red and white wire only.
Just to review.
using the Taco 2 zone switch. I would connect the 2 wires from each t-stat to the appropriate terminals in the switch, then run 2 wires back to the Aqua-stat from the end switch and attach them where the zone 1 t-stat Was originally connected.( T T) terminals
Then provide 110 volt power to the switch and attach each circ to their terminals.

Is this correct?
 
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