LAARS Mini-Therm II JVT (Sizes 50-225) - Install and Operating Manual - Manual (Page 20)

LAARS Heating Systems
Page 20
Figure 10. Multiple Zone Wiring.
For primary/secondary pumping: Connect
to "W" in lieu of "A." Boiler relay is used for
boiler pump and connection to "W" will
energize boiler pump when any zone is
calling for heat.
Wiring
with Taco
Zone Valves
Wiring with
Honeywell
Zone Valves
Wiring
with Multiple
Zone Pumps