NTI Ti100-200 Installation And Operation Instructions Manual page 38

Trinity │Installation and Operation Instructions
Advanced Wiring Systems
Figure 11-3 Zone Valve System – No Zone Controller
Legend
P1- Primary Pump
P2- Indirect pump, or
Combi Valve
*R – 120V Relay Coil
* Only required with Combi boiler.
Water Air
A C T
Indirect Aqua-
stat or Combi
flow switch
Zone Valve System – No Zone Controller
Figure 11-3 illustrates a typical wiring configuration required for a heating system using zone valves without a zone valve
controller.
Operation - Room thermostat closes circuit to zone valve motor, thus opening the valve. When the valve is opened, the end switch
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) and secondary pump (P3) 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.
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P3 - Secondary pump
CB - Trinity Control box
*R1 - Relay Contact
Burner On
Heating Pump
Aux. Pump
Call for Heat
%Ef.
Blue
White
Purple
Black
Ti Series
120/1/60
15 AMP FUSED
POWER SUPPLY