Nortec GS - 5.7 Combustion Air Connection

40 Installation
2583703_EN_1608 Nortec GS
5.7 Combustion Air Connection
Combustion air provisioning must meet the requirements stated in Sections 5.3 of the National Fuel Gas
Code (ANSI Z223.1) in the USA, or Sections 7.2, 7.3, 7.4 of the CAN/CGA B149 Installation Codes in
Canada, or applicable provisions of the local building codes.
Excess exposure to contaminated combustion air will result in safety and performance-related problems
with the humidier. Known contaminates include: halogens, ammonia, and chlorides, excessive dust,
lime or dirt. Excess exposure to these contaminants will also affect the on-board electronics. Contact
Nortec if you have any questions. If necessary, isolate the unit from the contaminated space.
Refer to "Site Requirements" on page 18 for combustion air requirements.
Select the type of installation required for combustion air – refer to "Space Air Installation" or "Sealed Combustion
Installation", as applicable.
5.7.1 Space Air Installation
This type of installation draws combustion air from inside the room/space where the humidier is installed.
Refer to Table 14 for the required minimum cross-sectional area for the fresh air intake in the room/space.
An appropriate opening to the outside of the building must be provided to allow fresh combustion air into
the space. Adhere to all local and national installation regulations.
Note: Nortec recommends installing an elbow (tted with a screen) at the intake air inlet on all Nortec GS
150-600 units to prevent dirt and debris from being drawn into the combustion chamber. Seal the connec-
tion with silicone sealant. Keep the area around the air intake clear of all obstructions. Refer to Figure 18.
Refer to Table 15 on page 41 for outside diameter of elbow.
Table 14: Room Fresh Air Intake Cross-sectional Area
Model Minimum Cross-sectional Area
GS 50 8 in
2
(51.61 cm
2
)
GS 100 13 in
2
(83.87 cm
2
)
GS 150 18 in
2
(116.13 cm
2
)
GS 200 23 in
2
(148.39 cm
2
)
GS 300 35 in
2
(225.81 cm
2
)
GS 450 53 in
2
(341.93 cm
2
)
GS 600 71 in
2
(458.06 cm
2
)
Figure 18:
1
2
Space Air Installation – GS 150-600
1 Elbow (not supplied) 2 Inlet, intake air (full-size unit)