Gas Connection General Information - Watts AERCO EXT Installation, Operation & Maintenance Manual

Modulex EXT Commercial Series
CHAPTER 4: Installation Instructions

4.9 Gas Connection General Information

For natural gas connections see Section 4.9.1. For propane gas, see Section 4.9.2.
The gas supply connection must comply with local regulations or, if such regulations do not
exist, with the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
An external gas pressure regulator is mandatory for the State of Massachusetts, regardless of
supply pressure; for all other jurisdictions, a lock-up style regulator is required when supply
pressure is greater than 10.5" W.C. The regulator must be installed with at least 2 feet of pipe
between the regulator and the unit gas inlet. The regulator discharge range must able to maintain
3.5" W.C. Gas regulators are self-contained with tapped diaphragm vent ports allowing the
diaphragm to change its position. These vents typically require piping to the outside.
For Canada, the gas connection must comply with local regulations or, if such regulations do not
exist, with the CAN/CSA-B149.1 - Natural Gas and Propane Installation Code.
Before installing the boiler, it is recommended that all the supply piping be thoroughly cleaned in
order to remove any residual grime which could compromise the boilers correct functioning.
As a safety measure against gas leaks, AERCO recommends installing a surveillance and
protective system made up of a gas leakage detector combined with an on-off solenoid valve on
the gas supply line.
The boiler and its individual shutoff valve must be disconnected from the gas supply piping
system during any pressure testing of that system at test pressures in excess of 1/2 PSI
(3.5kPa).
The boiler must be isolated from the gas supply piping system by closing its individual manual
shutoff valve during any pressure testing of the gas supply piping system at test pressures
equal to or less than 1/2 PSI (3.5 kPa).
Clause 1.34.1b.12: Provisions for combustion and ventilation air in accordance with the section
"Air for Combustion and Ventilation," of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or
Sections 8.2, 8.3 or 8.4 of Natural Gas and Propane Installation Code, CAN/CSA B149.1, or
applicable provisions of the local building codes.
Clause 1.34.1b.21: A sediment trap must be provided upstream of the gas controls.
W A R N I N G !
Gas connections must be installed by a registered installer who must comply with
all regulations and requirements indicated by the local gas supplier. An incorrect
installation can cause injury or death to persons or animals or damage to property. The
manufacturer is not liable for any injury and/or damage due to inappropriate installation.
Do not use the boiler for another type of gas than indicated on the identification plate of the
boiler. This will cause improper functioning and can damage the boiler. The suitable gas type
for the boiler is indicated on the packaging label and on the data plate boiler. First check the
identification plate on the boiler for the suitable gas type.
Always check the safety of the gas pipe system by means of a soap bubble test using a leak-
search spray.
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