Model CFC ClearFire Commercial Boilers
8 Rev. 05-2012
• Low Gas Pressure Interlock, manual reset.
• High Gas Pressure Interlock, manual reset.
• ASME CSD-1 Test Cocks.
• Downstream manual ball type shutoff cock.
• Single body dual safety shutoff gas valve.
Optional Equipment For option details, contact the local authorized Cleaver-Brooks representative. In
summary, here are some of the options that can be provided with the boiler:
A. Dual gas train for quick and easy fuel switchover.
B. Reusable air filter.
C. Condensate neutralization tank assembly - consists of neutralizing media, filter, and PVC
condensate holding tank with integral drain trap. This assembly can be mounted beneath
the boiler.
D. Outside air intake for direct vent combustion.
E. Outdoor temperature sensor for indoor/outdoor control.
F. Header temperature sensor for multiple boiler Lead/Lag operation.
G. Auxiliary Low Water Control (shipped loose) for field piping by others into the system piping.
H. Alarm Horn for safety shutdown.
I. Relays for output signal for burner on, fuel valve open.
J. Stack Thermometer.
K. Stack temperature limit-sensor.
L. Auto air vent.
M. Boiler drain valve.
DIMENSIONS AND RATINGS
For layout purposes, the overall dimensions for the Model CFC are shown in Table
B5-1 (US Dimensions) and Table B5-2 (Metric Dimensions) including the various
pipe connection sizes for supply and return water, drain, and vent. The performance
ratings for the boiler are shown in Table B5-3.
Altitude Relative to the ratings shown, installation of the boiler above 2000 feet elevation
will result in input capacity reduction. Please refer to Table B5-4 for input ratings of
the boiler at various elevations.
PERFORMANCE DATA
Efficiency The Model CFC is a "full condensing" boiler realizing efficiency gain at variable
operating conditions. It is designed to extract the latent heat of condensation over a
greater range than other designs. This can be seen in Figure B5-7, which depicts
nominal stack temperatures of the boiler versus other designs. The nominal point of
condensation is approximately 132
F (55.5 C). The ClearFire, due to its more
efficient heat transfer design and lower stack temperature, is able to capture the
latent heat of condensation over a broader range.
Fuel-to-water efficiency is relative to specific operating conditions. Operating
efficiency will be greater in the "condensing" mode of operation as noted above, yet
with its inherently greater heat transfer surfaces and superior pre-mix burner, the
ClearFire’s efficiency under "traditional" hot water conditions is also outstanding.
Table B5-6 through Table B5-9 show the guaranteed efficiencies at various
operating conditions and firing rates for Natural Gas. It should be noted that the
efficiency is exceptional at high fire and low fire versus other designs where high
efficiency is realized only with low fire or minimal firing rates and low temperature
returns.
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