BOILER BOOK CFC-E ENGINEERING DATA
18
ENGINEERING DATA
Boiler Information
The Model CFC-E boiler is designed for service in any closed hydronic system. It can be put into
operation as a single stand-alone unit with 5:1 turndown or in multiple units for larger turndown and
capacity.
Clearfire boilers may be utilized in water heating systems with temperatures from 40
F (4.4 C) to
194
F (90 C); ideal for systems such as ground water source heat pump applications. Because the
Clearfire is a full condensing boiler, low water temperature (below the dewpoint) restrictions do not
apply. In fact, the lower the return the better the fuel savings.
Variable temperature differentials can be designed to make use of changing outdoor conditions and
thus, the Clearfire is not restricted to a nominal 20
F (10 C) differential. The boiler is designed to
withstand thermal stresses with supply and return temperature differences up to 100
F (55 C),
without the use of a boiler-circulating pump, blend pump or minimum water flow.
Note: The Clearfire does not require a minimum flow or continuous flow through it during operation. However, the load
imposed on the boiler must be considered when sizing the system flow so that the flow does not exceed the capacity
of the boiler or the demand.
Flow Rates and Pressure Drops
To maintain rated capacity of the boiler, recommended flow rates should not be exceeded as the flow
will remove the heat beyond the capacity of the boiler.
Table 8. Flow Rates
CFC-E Flow Rates
Temperature Differential (°F)
10 20 30 40 50 60 70 80 90 100 110 120
Size Flow Rate GPM
500 94 47 31 24 19 16 13 12 10 9 9 8
750 141 71 47 35 28 24 20 18 16 14 13 12
1000 188 94 63 47 38 31 27 24 21 19 17 16
1500 283 141 94 71 57 47 40 35 31 28 26 24
2000 377 188 126 94 75 63 54 47 42 38 34 31
Recommended flow rates relative to temperature drop so as not to exceed boiler output.
Based on 94% nominal effficiency and maximum firing capacity
Based on water only
CFC-E Flow Rates [metric]
Temperature Differential (°C)
6 1117222833394450566167
Size
Flow Rate m
3
/hr
500 21.4 10.7 7.1 5.3 4.3 3.6 3.1 2.7 2.4 2.1 1.9 1.8
750 32.1 16.0 10.7 8.0 6.4 5.3 4.6 4.0 3.6 3.2 2.9 2.7
1000 42.8 21.4 14.3 10.7 8.6 7.1 6.1 5.3 4.8 4.3 3.9 3.6
1500 64.1 32.1 21.4 16.0 12.8 10.7 9.2 8.0 7.1 6.4 5.8 5.3
2000 85.5 42.8 28.5 21.4 17.1 14.3 12.2 10.7 9.5 8.6 7.8 7.1
Recommended flow rates relative to temperature drop so as not to exceed boiler output.
Based on 94% nominal efficiency and maximum firing capacity
Based on water only
To Next Page
Loading...
Need help?
General
