CleaverBrooks ClearFire CFC-E User Manual

CFC-E Installation Manual
1-10 Part No. 750-459
1.5 - Gas Connections
1.5.1 - General
Model CFC-E gas fired condensing boilers are full modulating
input units that require appropriate gas supply pressure and
volume for proper operation. The gas requirements specified in
this section must be satisfied to ensure efficient and stable
combustion. Installation must follow these guidelines and those
of any local authorities having installation jurisdiction.
1.5.2 - Gas Train Components
CFC-E boilers are equipped with a gas train that meets the
requirements of ASME CSD-1, FM and XL-GAP. The gas train
and its components have been designed and tested to operate
for the highest combustion efficiency for the CFC-E units.
1.5.3 - Gas Pressure Requirements
For proper and safe operation, each CFC-E Series boiler requires a stable gas supply pressure. See
Table 1-5 for pressure requirements.
Table 1-5: Model CFC-E Gas Pressure Requirements
Actual gas pressure should be measured when the burner is firing using a manometer at the upstream
test port connection on the main gas valve. For a multiple unit installation, gas pressure should be set
for a single unit first, then the remaining units should be staged on to ensure that gas supply pressure
drop is not more than 1" w.c. and never below the required pressure. Fluctuating gas pressure readings
could be indicative of a faulty supply regulator or improper gas piping size to the boiler. Refer to Tables
1-6 and 1-7 for gas piping recommendations.
NOTE: Certain capacities can support lower minimum gas pressures. Contact your local representative
for more information.
Boiler
Model
Minimum pressure required at gas train
connection (inches Water Column)
Max. pressure
(without step-down
regulator)
Maximum gas train pressure rating*
Natural Gas LP Gas UL cUL/CSA
500 7” 11”
14” WC
(1/2 psig)
1 psig 1/2 psig
750 7” 11”
1000 7” 11”
1500 7” 11”
2000 7” 11”
2500 7” 11”
5 psig 5 psig
3000 7” 11”
3500 7” 11”
4000 7” 11”
5000 7” 11”
6000 7” 11”
*Overpressure protection required when room supply gas pressure is greater than maximum gas train pressure rating.
COMBUSTION
ELECTRICAL
RACEWAY
ELECTRICAL
RACEWAY
HIGH TEMPERATURE
RETURN
LOW TEMPERATURE
RETURN
AIR INLET
Figure 1-9

CleaverBrooks ClearFire CFC-E Specifications

General

Brand	CleaverBrooks
Model	ClearFire CFC-E
Category	Boiler
Language	English