National Comfort Products CPG41838-U, Instruction Manual

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Heat exchangers can be accessed by following the steps of the slide out furnace feature. If the
model does not include this feature the heat exchanger can be inspected through the top supply
duct of by sliding out the cooling chassis and viewing from below.
On Non-Condensing Models the heat exchanger is a clamshell style heat exchanger made with
409 stainless steel.
On Condensing Furnaces there are two sections to the heat exchanger. The primary heat
exchanger which is a tubular style made of 409 stainless steel and the secondary heat
exchanger which is a coil made of 29/4C stainless steel.
Furnace Condensate Removal (Condensing Furnaces Only)
The secondary heat exchanger is where condensate forms in a condensing furnace. The furnace
has different components that aid in the drainage of the secondary heat exchanger.
Gas Furnace
Heat Exchanger
The heat exchanger is located on the left side of the furnaces. The inducer motor pulls fresh
air in through the heat exchanger creating a negative pressure. The burner fires creating
combustion gases that heat the heat exchanger, collecting and venting them through the flue.
The blower motor runs and distributes the heat from the heat exchanger through the ductwork
and diffusers. Poor airflow (dirty filters, undersized ductwork), over firing, and equipment
oversizing can lead to damage of the heat exchanger.
*Verify your temperature rise after installing or servicing to ensure long life of the heat
exchanger (see page 22).