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Cast Iron Condensing Boilers – Installation Manual
FlexCore Stainless Steel Condensing Boilers – Installation Manual
Figure 23 - Relays, Interlocks and Boiler Status
The Highest priority
Low Voltage
Interlocks, 24VAC
Factory ------------------------------
Water Flow Switch-----------------
Operator------------------------------
Spare for user or Factory ------
Gas Pressure (High & Low) -----
Variable Frequency Drive--------
Low Water Cutoff-------------------
SYSTEM FLOW PROVE ---------
1
2
3
4
5
6
7
8
Low Fire Hold: Fires the boiler at
the minimum rate while in
Calibrate. This functions exactly
as the T1 input
Calibrate: Allows adjustment of
the Minimum Fire, Maximum
Fire, and Pilot Ignition settings.
Combustion proving switch
from Combustion Air Damper.
Remote 120 VAC
Operator
USB and Flashdrive Ports:
Used by HeatNet Pro and
updating firmware.
Local Pump or
Power Open/ Power Close Valve
DHW Pump or
Power Open/ Power Close Valve
Stage Control
Damper Control
Alarm
JUMPER
WIRE if
not used