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Posted By caryalon

Weil McLain CG 4 SPDN fires on zone 1, but not zone 2

I have a Weil. McLain CG 4 SPDN boiler with 2 zones controllers by a Taco SR 502 2 zone switching relay and 2 Taco 007 cartridge circulators. These zones feed heat exchangers in 2 air handlers (1 for...
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