Heat System (Gas Models); Belt Switch; Motor - GE DBL333 Technical Service Manual

by removing the drum and visually inspecting the
element for breaks. Remove the leads from the
heater terminals and check for 12 ohms across the
terminals, then check each terminal to ground. If
the element is open or grounded, replace the heating
assembly. To replace the heater assembly, remove
the four Phillips screws holding the assembly to the
cabinet back. Transfer the high limit (safety)
thermostat from the old heater shroud to the new
shroud and install the new assembly.

Heat System (Gas models)

The heating system for a gas dryer is comprised of
three main components, the ignitor, the flame sensor
switch, and the gas control valve.
The ignitor is a silicon carbide thermistor mounted
at an angle with the tip extending into the flame area.
Depending on room temperature, the resistance of
the ignitor should be between 50 to 400 ohms. The
ignitor is fragile and susceptible to contamination
from skin oils. Use only the ignitor's insulated support
when handling to prevent damage. Electrically, the
ignitor is in parallel with the booster coil. The parallel
circuit of the ignitor and booster coil is in series with
the secondary coil on the gas valve. The series –
parallel circuit of the ignitor, booster coil, and
secondary coil is in turn in parallel with the holding
coil on the gas valve. Note: During the auto dry
cycle, you will be able to read some voltage at the
ignitor whenever the dryer is operating.
The flame sensor switch mounts on the side of the
burner duct and is single pole, single throw switch.
When the ignitor reaches approximately 1800
the flame sensor switch detects this high radiant heat
and opens. This energizes the secondary solenoid
gas valve coil, allowing gas to flow through the gas
valve. Gas flowing into the burner duct is ignited by
the still hot ignitor. The flame within the burner duct
heats the air being drawn into the back of the drum.
BURNER ASSEMBLY
IGNITOR
FLAME SENSOR
O F,
GAS VALVE
12

Belt Switch

The belt switch is a normally closed switch and is
mounted on the motor bracket next to the idler arm.
If the drive belt breaks or jumps off the idler pulley,
the idler arm will contact the belt switch, causing the
switch contacts to open, and thereby opening the
circuit to the motor. To access the belt switch, remove
the access panel on the rear of the dryer. Remove
the leads from the switch and connect an ohmmeter
across the switch terminals. The ohmmeter should
read continuity when the belt is on.
CENTRIFUGAL SWITCH
BELT SWITCH

Motor

The drive motor is a single speed, dual shaft, ¼ hp,
1725 rpm motor with an automatic reset overload
protector. The overload protector in an internal
component of the motor and cannot be replaced
separately. The motor shaft is threaded on one end
for the blower wheel, with the belt pulley on the other.
The pulley is not available separately and comes
pressed on the shaft of a new motor.