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7.2.3 Multiple Zones Pump controller
(Models Taco SR504, Argo ARM 861 Series)
The basic multiple zoned system using circulating pumps. This wiring system is used with the piping as
described in 6.2.2 Multiple Zones using Pumps and 6.2.3 Multiple Zones with different temperatures.
Operation
Room thermostat closes circuit to TT terminals of the pump controller. The controller energizes the
appropriate circulating pump and closes the circuit between terminals T-C on the Sentry control. The
Sentry 2100, provides power to the primary pump (C
1
), once the pump is on, it turns on the burner.
Once the room thermostat is satisfied, it breaks power to the TT terminal of the pump controller, which
opens the X –X contacts, which opens the T-C circuit. The Pumps and burner turn off.
Indirect
thermostat,
or combi flow
switch
Legend
P1- Primary Pump P3-Secondary pump
P2- Indirect pump, or
CB- Trinity Control box
Combi Valve
