Frigidaire Dryer Servicing page 85

Section 5 Troubleshooting
Electrical Tests For Gas Dryers
Manifold Pressure
Connect manometer to pressure tap on gas valve. During burner operation, manometer reading should be between
2.9 and 4.0 inches of gage oil.
Flames Entering Drying Chamber
Block exhaust and inspect flame length. The flames should not be entering the drying chamber.
Flash Back Into Burner
With exhaust blocked, inspect for flash back into burner during ignition.
Flame Failure
Shut off manual gas valve to extinguish flame. Sensor must shut off gas valve within 90 seconds.
Power Interruption
Interrupt power momentarily for 2 seconds, motor should not continue to run when power is restored. Valve should
not open when power is restored until ignition device is re-energized.
Carbon Deposit
Inspect heater housing and burner tube for carbon deposits after testing.
Ignition Time
Time required for glow bar to light gas: 50 sec. max.
Ignition Power
Power required for glow bar to light gas: 550 - 850 W
Minimum Operating Voltage
Dryer and gas valve to function properly at 100 Volts.
Reduced Gas Pressure
Reduce gas pressure to 1.0 inch in gage oil. Stop and then restart dryer. Allow gas ignition system to recycle and
check to see that ignition is obtained.
Static Pressure
Static pressure at the exhaust exit (when using a 100% exhaust block), as measured by a manometer, shall be 1.6
inch of gage oil, minimum.
High Limit Thermostat Cycle Time Trip
Trip:
Run the following test at room temperature. Set the control board cycle time for 30 minutes and the heat selection
for regular fabrics (max heat setting). Place a 100% exhaust block on the exhaust pipe. The dryer door should be
open for this test and the door switch held closed by tape or similar means. The thermostat must open (heater off)
between 25 to 110 seconds.
Reset:
When the exhaust block is removed and the door closed (keep tape over door switch), the thermostat must reset
(heat on) within 120 seconds.
5-5