Справочник Пользователя для American Dryer Corp. AD-464
450260-1
www.amdry.com
13
Burner Air Switch
The dryer uses a burner air switch on its burner components.
The differential air pressure is measured by this air switch,
which is located next to the burner fan motor. If the combustion
air is inadequate, this switch will prevent ignition. The setting
of this burner air switch is adjustable, and is preset at the
factory.
When the pilot flame is ignited, the pilot gas pressure should
measure 3.5-inches (38.1 mm) water column (W.C.) for
natural gas and 1.5-inches (88.9 mm) W.C. for liquid propane
(L.P.) gas. The pilot flame should be about the size of a
3-inch diameter ball.
Once the pilot has been properly set, remove the pressure
Once the pilot has been properly set, remove the pressure
gauge from the pilot line connect a differential pressure gauge
between the main gas pressure tap (HI port) and the air
pressure tap (LO port) on the side of the gas burner box. The
lines connecting the gauge to these taps must be long
enough to allow the gauge to sit outside of the dryer so that
the burner section access door can be closed when the dryer
runs. Running the dryer with these doors open will give an
incorrect air pressure reading.
MAN4398
Once this differential gauge is installed, open the main gas
shutoff valve and push the test and reset button on the BCM
so that the button springs out. Restart the dryer. The ignition
process should now continue to the full gas flow state. The
differential gauge should read 2.5-inches (63.5 mm) W.C. for
natural gas and 1.25-inches (31.8 mm) W.C. for L.P. gas. If it
does not, adjust the top gas valve as described in Top
Motorized Gas Valve on page 11.
Burner Air Switch Replacement
1. Discontinue electrical service to the dryer.
2. Remove the two (2) 1/4" x 1/8" M.P.T. straight brass
2. Remove the two (2) 1/4" x 1/8" M.P.T. straight brass
connectors from the burner fan air switch.
3. Remove the 5/16-18 x 3/4" tap bolt as well as the
5/16" lock washer.
4. Mark and identify the wires for correct replacement on
the new burner air switch.
5. Remove the cord grip from the burner fan air switch.
6. To install new burner air switch, reverse Step #5 through
6. To install new burner air switch, reverse Step #5 through
Step #2.
7. Reestablish electrical service to the dryer.
Burner Squirrel Cage Fan Components
The combustion air is produced by a 6-1/4" squirrel cage fan,
attached to a 1-1/2 hp, 3,600 rpm motor. This motor must
spin counterclockwise (CCW) as viewed from the rear of the
motor.