3.0 Installation
The gas-fired modulating boilers are low pressure, fully condensing appliances having a variable input
range. Approved as “Category IV” vented appliances, the boilers use either Direct Vent (sealed
combustion) or indoor combustion air, providing a great degree of installation flexibility.
3.1 Code requirements
The boilers are tested and certified under CSA 4.9-2017 / ANSI Z21.13-2017. Below are the code
requirements for every installation.
Canada US
Conform to local codes, or in the absence of
these, with the latest editions of CAN/CGA
B149.1 and the Canadian Electrical Code Part 1
CSA C22.2 No. 1.
Where required by jurisdiction, installation must
conform to the Standard for Controls and Safety
Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1.
If there is any conflict, follow the more stringent
regulations.
Conform to the current National Fuel Gas Code
ANSI Z223.1 and the National Electrical Code
ANSI/NFPA 70.
Where required by jurisdiction, installation must
conform to the Standard for Controls and Safety
Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1.
If there is any conflict, follow the more stringent
regulations.
Table 2 Code requirements by country
3.2 Determining location of the appliance
The boilers are designed and approved for indoor installation in areas such as an alcove, basement, or
utility room. These areas should have a surrounding temperature of 32 °F (0°C) to 122 °F (50 °C) and
less than 90% relative humidity.
Even though EX models are approved for installation on combustible floors, do not install them on
carpet.
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