NTI Ti100-200 Installation And Operation Instructions Manual page 39

Ti Series
Figure 11-4 Zone Valve System – w/Zone Controller
LEGEND:
P1 – Primary Pump CB – Trinity Control Box
P2 – Indirect Pump, or Combi Valve
P3 – Secondary Pump
*R1 – Normally Close Relay Contact
* Only required with Combi boiler.
Indirect Aqua-stat or Combi
flow switch
Zone Valve System – w/Zone Controller
Figure 11-4 illustrates a typical wiring configuration required for a heating system using zone valves with a zone valve controller
(Example shows a Taco model ZVC404).
Operation - Room thermostat closes circuit to TT terminals of the zone controller. The controller energizes the appropriate zone
valve and closes the circuit between terminals T-C at the Trinity Ti Low Voltage field connection (See Table 11-2 and Figures 11-
1 and 11-2). The Sentry 2100 provides power to the primary pump (P1) via the C1 (blue) pump output, see Table 11-1 and Figures
11-1 and 11-2. The controller then operates the burner to maintain the Space Heat set-point (HI), see Section 12.0.
Combi Boilers - The indirect pump is replaced by the internal diverter valve in Combi boilers.
Combi boilers using this configuration must utilize a field supplied 120VAC relay (R) with a
normally closed contact (R1). The R relay is powered with the internal diverter valve on a demand
for DHW; the R1 relay contact opens preventing the Seconday pump (P3) from operating on a demand for DHW.
*R – 120V Relay Coil
Installation and Operation Instructions │Trinity
39