COZY CF403D-H Instructions D'installation Et D'utilisation page 24

TROUBLESHOOTING CHART ( FOR QUALIFIED SERVICE TECHNICIAN ) - BLOCKED FLUE SWITCH PROBLEMS
The following is a list of possible causes and corrective actions for blocked flue switch problems.
WARNING: Do not bypass the blocked flue switch. To do so could expose the consumer to property
!
damage, personal injury or possible death.
POSSIBLE CAUSES
1. Blockage In Vent Pipe
2. Burner Is Overfiring
3. Improper vent system.
A. Vent too short
B. Restriction in vent system
caused by offsets
C. Incorrect vent pipe
4. Incorrect header plate location
5. Vent pipe not down on the
header plate securely
6. Loose connections on the
safety wiring harness
1. A. Check vent pipe for blockage, such as bird nest, wasp nest, twigs, leaves, etc.
B. Check inside the bottom of the vent pipe to make sure the top of the draft diverter did not rip the inner
liner causing it to block part of the vent opening.
C. Check that no insulation from the header plate got caught on top of the draft diverter when the heater
was inserted into the wall.
D. Check that the vent cap is properly installed, not shoved too far down on the vent pipe.
2. A. Check the manifold pressure.
B. Check the rate
NOTE: This appliance was orificed for elevations up to 2,000 feet. When installed at higher elevations
refer to orifice chart in "Controls" section of instructions for proper orifice size.
3. Correct vent system.
A. The vent should terminate a minimum of 12 feet above the floor. See Figure 2 (on page 5). Also, the top
of the vent must be at least 2 foot above any obstacle within a 10 foot radius, including the roof. See
Figure 1 on Page 5.
B. All type "B" vents shall extend in a generally vertical direction with offsets not exceeding 45
degrees, except that a vent system having not more than one 60 degree offset may be allowed.
Any angle greater than 45 degrees from the vertical is considered horizontal. The total horizontal
run of a vent plus the horizontal vent connector shall be not greater than 75 percent of the vertical
height of the vent.
C. Use listed BW type vent pipe. Do not use transite or any other type of ceramic pipe for venting. Do not
use single wall pipe. When venting into a masonry chimney the chimney must be properly lined and
sized for this gas furnace. The use of type B or a flexible chimney liner is recommended.
4. Consult Figure 10 (on page 10) for correct header plate height.
5. You must use a base plate (obtained from the vent pipe manufacturer) on top of the header plate, or wall
furnace. This will lock the vent pipe down and prevent the draft diverter from shoving it up.
6. Check the connections on both the switch and the gas valve. Tighten if necessary.
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CORRECTIVE ACTION
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1018029-A