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Penetrations from sheet metal screws used to
fasten the ductwork to the cabinet of the unit
should only be placed into the duct flange provided.
This is to avoid contact and damage of the
heating/air conditioning coils and internal wiring.
Ducting
The duct sizing for the furnace section can be
determined using HRAI Residential Air System
Design Manual, SMACNA, or any other industry-
recognized manuals.
Note: "Combo units" normally deliver air at approx.
110°F (43°C), and therefore may require larger than
normal ductwork. When installing the Clean Air
Furnace as a replacement unit on a retrofit applica-
tion, always calculate the size of duct that is there.
Any ductwork running through unconditioned
space must be sealed properly and insulated to
prevent heat loss. All local codes must be
followed in determining the amount of insulation
needed.
The ventilation section consists of two 6"
(15.2cm) round ports located on the side of the
cabinet, which vent to the outside. Insulated
ducting with a vapour barrier such as flex-ducting,
or ridged pipe wrapped in pipe sleeve, is required
to prevent condensation from occurring on the
pipe. Also the airflow in these lines is designed to
be balanced. (See "Balancing Airflows" in this
manual, for damper location and procedure).
Warning: A backdraft damper is required in the
exhaust air duct to prevent cold air from entering the
unit when the Clean Air Furnace is not running.
23
Option 2 - Ventilation Ports Off Right Side
Remove circular
metal knockout
Remove
styrofoam
knockout
Remove
styrofoam
knockout
Remove
styrofoam
knockout
Remove circular
metal knockout
Models 40DHW, 60DHW & 4TONDHW
Models 40DHWDF & 60DHWDF
Horizontal Version
Models 40DHW, 60DHW & 4TONDHW