Introduction
1-4
750-382
CBT
1.2 — Burner
1.2.1 — Full modulation (CBT-M)
Full modulation units use a premix burner with a self-regulat-
ing gas valve-venturi system, ECM variable regulating gas
valve, variable speed blower, and Fecralloy metal fiber
burner canister.
• Full modulation is provided using the integral variable
speed combustion air fan and Falcon control.
• The low temperature, surface combustion burner flame
provides low emissions and optimum combustion effi-
ciency.
• Direct spark ignition with UV flame detection.
• At maximum firing rate, the sound level of the burner is
less than 70 dBA, measured in front of the boiler at a dis-
tance of 3 feet. At reduced firing rates, sound levels are
even lower.
• Provision is made for optional direct vent combustion air
connection.
• Combustion Air Proving Switch standard.
• Combustion air filter is standard.
1.2.2 — On-off firing (CBT)
Gas is introduced into the combustion zone from a circular manifold
through multiple ports in the manifold. Burner firing is regulated by a
main gas regulator operating steam pressure control. Burner includes
microprocessor-based flame supervision control.
• Direct spark ignition with flame rod.
• Provision is made for optional direct vent combustion air connec-
tion.
• Combustion Air Proving Switch standard.
• Combustion air filter is standard.
FIGURE 1-3. Full modulation burner
FIGURE 1-4. On/off burner
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