Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 8)

8
Installation - Venting for All Indoor Units
NOTE!
The drip leg should be cleaned out periodically during the heating season.
Venting Methods
There are three venting method for indoor mounted units. Specific venting instructions are provided for each
method. Refer to the specific instructions for the venting method listed in the CAPS submittal.
The venting method options are:
• Standard Indoor Venting (uses building air for combustion, vents outdoors, one roof or wall penetration)
• Separated Combustion 2-Pipe Venting (uses outside air for combustion, vents outdoor, two exterior roof or
wall penetrations)
• Separated Combustion Concentric Venting (uses outside air for combustion, vents outdoors, one exterior roof
or wall penetration)
NOTE!
For each method, the units can be vented horizontally through an exterior wall or vertically through the
roof. Refer to the specific venting instructions for your unit. Construct the vent system as shown in
these instructions.
NOTE!
Vent piping is supplied by others and not supplied by Greenheck.
Installation
WARNING!
The following guidelines must be followed for all indoor units:
1. Installation of venting must conform with local building codes. In the absence of local codes,
installation must conform with the National Fuel Gas Code, ANSI Z223.1 or in Canada,
CAN/CGA-B149 installations codes.
2. For the exhaust pipe, use pipe approved for a category III appliance or single wall, 26 gauge or
heavier galvanized vent pipe. The piping is required to be gas tight by ANSI.
3. For the combustion air pipe on separated combustion units, sealed single-wall galvanized air
pipe is recommended.
4. The joints must be sealed with a metallic tape or silastic suitable for temperatures up to 350ºF.
5. A minimum of 12 inches of straight vent pipe is recommended after the exhaust connection and
before any elbows.
6. Vertical combustion air pipes should be fitted with a tee, drip leg and clean-out cap to prevent
any moisture in the combustion air pipe from entering the unit.
7. To reduce condensation, insulate any vent runs greater than 5 feet.
8. All vent pipe connections should be made with at least three corrosion resistant sheet metal
screws.
9. Refer to the National Fuel Gas Code for additional piping guidelines.