Gas Supply Piping; Gas Supply Specifications; External Gas Supply Regulator - Watts AERCO CFR 3000 Installation And Start-Up Manual

SECTION 2: INSTALLATION

2.8 Gas Supply Piping

Consult TAG-0106, CFR Gas Supply Design Guide before designing or installing any gas supply piping.
Do NOT under any circumstances use matches, candles, flames, or other sources of ignition to check for gas
leaks. Failure to heed this warning may result in death, bodily harm, or damage to equipment or property.
Many of the soaps used for gas pipe leak testing are corrosive to metals. Therefore, piping must be rinsed
thoroughly with clean water after leak checks have been completed.
NOTE: All gas piping must be arranged so that it does not interfere with removal of any covers, inhibit
service/maintenance, or restrict access to the unit.
The CFR 3000 has a 2" (5.08 cm) gas inlet pipe. Prior to installation, all pipes should be de-burred and
internally cleared of any scale, metal chips or other foreign particles. Do not install any flexible connectors
or unapproved gas fittings. Piping must not be supported by the unit. Use a suitable piping compound
approved for use with natural gas. Any excess must be wiped off to prevent clogging of components.
To avoid unit damage when pressure testing gas piping, the unit must be isolated from the gas supply
piping. A thorough leak test of all external piping must be performed using a soap and water solution or
suitable equivalent. The gas piping used must meet all applicable codes.

2.8.1 Gas Supply Specifications

CFR Low NOx series boilers require stable natural gas and propane input pressure. It must comply with
the allowable gas inlet pressure range specified in the CFR Gas Supply Design Guide, TAG-0106.

2.8.2 External Gas Supply Regulator

An external gas pressure regulator is required on the gas inlet piping under most conditions.
Regulators must conform to the specifications in the CFR Gas Supply Design Guide, TAG-0106.
NOTE: It is the responsibility of the customer to source and purchase the appropriate gas regulator as
described above. However, AERCO offers for sale an appropriate regulator, which may be ordered at the time
of unit purchase or separately. Contact your AERCO sales representative for more information.
It is strongly recommended that the pressure regulator be installed a minimum distance of 10 pipe
diameters between the pressure regulator and the nearest downstream fittings (an elbow or the unit
itself), and a minimum of 5 pipe diameters between the pressure regulator and any upstream fitting, such
as elbow or shutoff valve, as shown below.
GAS INLET
MANUAL SHUT-OFF
VALVE
GAS PRESSURE
REGULATOR
•
⚠
C A U T I O N !
Figure 2-8: Gas Regulator and Manual Shut-Off Valve
MINIMUM 5 PIPE DIAMETERS IN LENGTH
MINIMUM 10 PIPE
DIAMETERS IN LENGTH
GAS INLET
• •