Smith GT-150, Installation, Operating And Maintenance Manual

Page: 21 / 40

GT INSTALLATION AND OPERATION INSTRUCTIONS Page 21
Multiple Zone Pump Controller
Models Taco SR504, Argo ARM 861 Series
Figure 32 shows the basic multiple zoned system using
circulating pumps. This wiring system is used with the
piping as shown in Figures 25.
When there is a call for heat the room thermostat
closes the circuit between the TT terminals on the pump
controller. The controller energizes the appropriate
circulating pump and closes the circuit between terminals
T and C on the Sentry 2100 control. The Sentry 2100,
provides power to the primary pump via terminal C1.
Once these pumps are on, the burner fi res.
Once the room thermostat is satisfi ed, it breaks power
to the TT terminal of the pump controller de-energizing
the XX contacts. The circuit between terminals T and C
opens shutting down the pumps and the burner.
Figure 32 - Multiple Zone Pump Controller, Models Taco SR504, Argo ARM 861 Series