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IV. AMP Component Identification (continued)
16. Inlet/Return water connection
Inlet connection that returns water from the system to the boiler. Refer to Table 3 for model specific pipe
connection sizes.
17. Supply/outlet water temperature sensor
Dual element temperature sensor for high limit and modulation control.
18. Return/Inlet water temperature sensor
Used for monitoring the inlet water temperature and temperature rise.
19. Low water cut off probe and reset box
The unit comes with an integrated Low Water Cut Off (LWCO) probe and rest box. The LWCO safeguards the heat
exchanger from inadequate water level. The LWCO has a manual reset button.
20. Temperature and pressure gauge
Provides real time outlet water temperature and pressure readings.
21. Pressure relief valve
The safety relief valve protects the heat exchanger from an over pressure condition. Refer to Table 2 for standard
factory supplied relief valve sizes and optional sizes for all models.
22. Condensate drain trap
Serves to discharge condensate from the heat exchanger while preventing flue gases from escaping through the
drain line.
23. Minimum combustion air proving switch
Ensures adequate combustion air is supplied to the combustion chamber for stable and complete ignition.
24. Blocked vent switch
The blocked vent switch interrupts the control circuit when there is a vent blockage or significant restriction of
vent piping.
25. Combustion air filter box
Provides a combustion air connection for direct vent installation, and houses the air filter.
26. Exhaust vent connection
The vent pipe conveys combustion products to a safe point of discharge. The unit is equipped standard with a
stainless steel vent connection. Refer to Table 6 for model specific vent connection sizes.
27. Heat exchanger
316L Stainless Steel, Condensing, water tube type heat exchanger.
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