Nortec GS Series - Manual (Page 14)

11 | GS Series Installation
Combustion Air Requirements
General
Provide for adequate combustion and ventilation air in accordance with sections 5.3, air for combustion and
ventilation, of the national fuel gas code, ANSI z223.1, or sections 7.2, 7.3, 7.4 of CSA B149.1 installation
codes, or applicable provisions of the local building codes.
The required free area of supply air opening is:
13 in. Sq. (8,387 mm2), for GS 100
23 in. Sq. (14,839 mm2), for GS 200
35 in. Sq. (22,581 mm2), for GS 300
47 in. Sq. (30,323 mm2), for GS 400
59 in. Sq. (38,064 mm2), for GS 500
71 in. Sq. (45,806 mm2), for GS 600
Cabinet top and bottom contain air openings to provide combustion air to the forced draft blower. Do not
block these openings.
Excessive exposure to contaminated combustion air will result in safety and performance related problems.
Known contaminates include halogens, ammonia, and chlorides, excessive dust, lime or dirt. Excessive
exposure of electronics to the contaminants will also result in performance related problems. Contact nortec
technical services if you have any questions. If contaminants exist, isolate the unit from the contaminated
space.
Sealed Combustion Guidelines
Installation of the combustion air supply line must be carried out by adequately qualified personnel. All local
regulations relating to the provision of air supply systems must be observed and adhered to.
The air supply line and the exhaust must individually not exceed a respective equivalent length of 70 ft. (21
m). The vent pipe diameter must be maintained over the overall length of the vent.
The air supply line should be approximately as long as the flue gas venting and must be supported at every 5
ft. (1.5 m) and additionally at every pipe bend. At low temperatures, water condensation can form on the
outside of the pipe. To prevent this, it is recommended that the supply air line is insulated and an in line
heat is added. Consult factory.
Attach the air supply line to the manifold using a hose clamp or hose coupling if required. See Figure 6.
The air intake terminal and the flue gas terminal must end at an outside location. See Figure 8: Location of
air intake and glue gas terminal must comply with all local and national regulations.
Warning:
Air supply line should not obstruct any services going to the humidifier front and right side cabinet
panels.