COZY CF403D-H Installation And Operating Instructions Manual page 19

THE FOLLOWING IS A LIST OF POSSIBLE CAUSES AND CORRECTIVE
ACTIONS FOR BLOCKED FLUE SWITCH PROBLEMS - FOR USE BY A
QUALIFIED INSTALLER OR SERVICE TECHNICIAN.
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
DO NOT BYPASS THE BLOCKED FLUE SWITCH: TO DO SO COULD EXPOSE THE
CONSUMER TO PROPERTY DAMAGE, PERSONAL INJURY OR POSSIBLE DEATH.
1. A) Check vent pipe for blockage, such as bird nest, wasp nest, twigs, leaves, etc.
1. 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.
1. 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.
1. D) Check that the vent cap is properly installed, not shoved too far down on the
vent pipe.
2. A) Check the manifold pressure.
2. 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 1.
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 A on Page 4.
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 6 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.
CORRECTIVE ACTION
Page 19