Filter
Top Products
035-19992-001 Rev. A (0404)
Unitary Products Group 3
INSTRUCTIONS FOR EXAMINING THE FURNACE
INSTALLATION
It is the owner’s responsibility to ensure that an annual inspection of the
entire heating portion of the unit is made by a qualified service agency.
Examine the furnace as outlined below in steps “1 - 6” before each
heating season. Use Figures 5 & 6 for visual reference.
1. Examine the heat exchanger, vent/combustion air piping, vent
connectors and chimney to be sure they are clear and free of
obstructions.
2. Examine the vent pipe making sure it is firmly in place, that it
slopes slightly upward and is physically sound without holes and
all of the connections are secure.
3. Examine the return-air duct connections to make sure they are
physically sound, sealed to the furnace casing, and the ducts ter-
minate outside the space containing the furnace.
4. Examine the furnace casing making sure the physical support is
sound without sagging, cracks or gaps. Examine the furnace base
making sure it is physically sound without cracks, gaps or sagging
and has a good seal.
5. Examine the furnace casing for obvious signs of deterioration.
6. Examine the burner flames to make sure they are in good adjust-
ment. Refer to the pictorial sketch shown in Figure 4 as a compar-
ison to the actual flame.
FIGURE 4: Burner Flame Drawing
BLUE CONE PORTION OF FLAME SHOULD
ENTER HEAT EXCHANGER TUBE
FIGURE 5: Furnace Examination Checkpoints - Upflow
6
REMOVE
PANEL
TO EXAMINE
BURNER
FLAMES
6
REMOVE
PANEL
TO EXAMINE
BURNER
FLAMES
3
EXAMINE
RETURN AIR
DUCT
CONNECTION
3
EXAMINE
RETURN AIR
DUCT
CONNECTION
4
EXAMINE
FURNACE
CASING
4
EXAMINE
FURNACE
CASING
5
1
EXTERNAL HEAT EXCHANGER INTERNAL
VENT COMBUSTION AIR PIPE. MUST
REMOVE PANEL TO EXAMINE.
EXAMINE ENTIRE
FURNACE CASING
SHOWN IN ALL
DRAWINGS
EXAMINE EXTERNAL
VENT PIPE
FIGURE 6: Furnace Examination Checkpoints - Downflow
6
REMOVE
PANEL
TO EXAMINE
BURNER
FLAMES
6
REMOVE
PANEL
TO EXAMINE
BURNER
FLAMES
3
EXAMINE RETURN
AIR DUCT
CONNECTION
4
EXAMINE
FURNACE
CASING
4
EXAMINE
FURNACE
CASING
5
1
EXTERNAL HEAT EXCHANGER INTERNAL
VENT COMBUSTION AIR PIPE. MUST
REMOVE PANEL TO EXAMINE.
EXAMINE ENTIRE
FURNACE CASING
SHOWN IN ALL
DRAWINGS
EXAMINE
EXTERNAL
VENT PIPE
3
EXAMINE RETURN
AIR DUCT
CONNECTION