Operator's Manual: Models CB-3500 & CB-5000
8-4
Figure 8C - Proper Draft vs. Backdraft
DR
AFT
M
OR
E
LE
SS
BACKDRAFT CREATED
BY EXHAUST FAN
TO BURNER
COMBUSTION AIR
DR
AF
T
M
OR
E
LE
SS
I88809-A
SERVICEMAN ADJUST
BAROMETRIC DAMPER
TO OBTAIN -.04 TO -.06 W.C.
DRAFT AT STACK
Special Note to
Service Personnel
Corresponding Draft Over Fire
measurement should be -.02 to -.04 WC
BACKDRAFT
EXHUST FAN CREATES BACKDRAFT IN STACK
AND SUCKS COMBUSTION GASES DOWN THE
STACK AND BACK INTO THE FURNACE
OIL SPRAY AND HEAT IS FORCED
BACK AGAINST THE BURNER AND
RESULTS IN OIL FOULED ELECTRODES
AND RETENTION HEAD.
SEVERE BACKDRAFT WILL HEAT AND
DAMAGE THE CAD CELL AND THE
TRANSFORMER.
PROPER DRAFT
RISING HOT
COMBUSTION
GASES PRODUCE
PROPER DRAFT
TO ARRIVE AT PROPER DRAFT
MEASUREMENTS BE SURE THAT
ALL FANS WITHIN THE BUILDING
ARE RUNNING WHILE ADJUSTING
THE DRAFT TO FINAL LEVELS!
DRAFT OVERFIRE OF -.02 TO -.04
W.C. MEANS COMBUSTION GASES
ARE FLOWING AWAY FROM THE
BURNER,THROUGH THE FURNACE
FLUES AND UP THE STACK
Summary of Contents for CB-3500 series
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