NTI TFTN - Page 57

TFTN 085-199 Installation and Operation Manual
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Figure 11-1(c) Cascade Plumbing Schematic – CH & DHW Zone Valves
NOTES:
1. For ZONE 1, ZONE 2 & ZONE 3 to output 24VAC (like in this example), jumper ZONE INPUT to R (24V).
2. Pumps responsible for circulating water through the boiler must be sized accordingly (see Tables 10.2 & 10.3).
3. System Sensor – mandatory in cascade configurations; must be installed downstream of the LL-header. Connect to AUX1 NTC
at the Manager boiler and set Sensor Configuration option Auxiliary Sensor 1 (24.6.1) = System Sensor.
4. Downstream IWH – connect the Tank Sensor (or Aquastat) and DHW Zone Valve to the Manager boiler and set Cascade Setup
option DHW Mode (Cascade) = Downstream IWH (Tank Sensor or Aquastat).
NOTE: the boiler outputs 120VAC at the DHW PUMP connection, issolate with a relay if using a 24V DHW Zone Valve.
5. Upstream IWH – connect the Tank Sensor (or Aquastat) and DHW Pump to the boiler it is piped to and set the respective
boiler’s DHW Setup option DHW Mode = Upstream IWH (Tank Sensor or Aquastat).
NOTE: an Upstream IWH cannot be connected (piped/wired) to a Manager boiler if there is a Downstream IWH.
6. System Pump – connect to the AUX2 PUMP output at the Manager boiler.
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