11
15. Supply gas line
Provides a means of connection for incoming gas line to the boiler’s gas train assembly. See Table 21 for
model specific pipe sizes.
16. Return water connection
Conveys return water from the system to the boiler. Refer to Table 3 for model specific pipe size.
17. Boiler Supply water temperature sensor
Main boiler control adjusts the firing rate of the burner based on the supply water temperature and system
set point.
18. Low water cut off probe and reset box
The unit comes with an integrated Low Water Cut Off (LWCO) probe and rest box. LWCO safeguards the
heat exchanger from inadequate water level. The LWCO has a manual reset button.
19. Temperature and pressure gauge
Provides real time supply water temperature and pressure readings.
20. 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.
21. Condensate drain trap
Serves to discharge condensate from heat exchanger while preventing flue gases escaping into condensate
drain line.
22. Minimum combustion air proving switch
It ensures adequate combustion air is supplied to the combustion chamber for stable and complete
ignition.
23. Blocked vent switch
The blocked vent switch interrupt the control circuit when there is a vent blockage or significant restriction
of vent piping.
24. Combustion air intake connection
It provides pathway for combustion air to enter the ignition system by a means of negative pressure
(suction) generated by the blower.
25. Exhaust vent connection
The vent pipe conveys combustion products to a safe point of discharge. The unit is equipped with a
standard AL-29 4C stainless steel vent connection. Refer to Table 7 for model specific vent connection size.
IV. BFIT - Component Identification
(continued)
Summary of Contents for BFIT 1000
Page 9: ...9 Figure 1 BFIT MODEL 1000 2000 ...
Page 12: ...12 IV BFIT Component Identification continued Figure 2 Component Identification ...
Page 13: ...13 IV BFIT Component Identification continued Figure 3 Component Identification ...
Page 52: ...52 Figure 24 Operating Instructions XII System Start up continued ...
Page 66: ...66 APPENDIX D INLET OUTLET WATER AND FLUE OUTLET TEMPERATURE SENSOR RESISTANCE VOLTAGE CHART ...
Page 68: ...68 ...
