Off-grid Furnace controls [RE-wrenches]

[Kirk Herander]

In regard to the furnace thread, I recently had to remove the phantom load
effect of a multiple-zone hydronic boiler. Each zone has a dedicated Taco
circulator instead of a zone valve. The pumps are energized through a Taco
control box, based on the 24vac t-stat closure for each respective zone. We
used double pole, single throw line voltage thermostats. The main boiler /
control 120vac power is paralleled through pole 1 of each thermostat. Pole 2
of each t-stat is wired into the Taco control box. Whenever there a T-stat
calls for heat, the boiler and controls are powered up by 120 vac, and the
the 24 vac closure is made, instructing the individual circulator to turn
on.
t-stat part# is Mcmaster-Carr 17395K95

Vermont Solar Engineering - a Xantrex / Trace Certified Dealer
Kirk Herander
PO Box 697
Burlington, VT. 05402
www.vermontsolar.com
www.backeastsolar.com
800.286.1252 - 802.863.1202
fax 802.863.7908

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