28
06/21
8390-016A
1. Install a vacuum “TEE” between the vacuum switch and
drop tube.
2. Install the vacuum gauge to the “TEE”.
3. Turn thermostat on or dial control. ***
NOTE:
make
sure fuel is in the hopper as this can effect the vacuum
reading. It takes a minimum of .04 inches of water
column to close the vacuum switch.****
4. Your vacuum gauge should be reading between .19 to
.30 inches of water column while the exhaust blower is
running on HIGH. (on a cold appliance & NO Fire).
ALL VACUUM READINGS ARE MEASURED IN INCHES
OF WATER COLUMN. LONG VERTICAL VENT RUNS
WILL PRODUCE
GREATER VACUUM
COMPARED TO
HORIZONTAL RUNS.
NOTE:
Low vacuum can be the result of a leaking door gasket,
firepot not closing all of the way, dirty heat exchanger, or
plugged vent system.
Always make sure the appliance is clean before making
any repairs.
(VACUUM GAUGE)
RED
= LOW VACUUM
GREEN
= OPERATING RANGE
BLUE
= SHUTDOWN
FIREBOX VACUUM & VACUUM SWITCH TROUBLESHOOTING
VACUUM “TEE”
VACUUM “TEE”
VACUUM SWITCH
VACUUM SWITCH
