Rating Label; Functional Operation - Maytag AGR5715QD Service Manual

General Information

Rating Label

Model numbers are recorded on the rating label. Rating
label is located on the lower front right corner of the oven
frame. It can be seen by opening the oven door. Before
ordering parts, write down the correct model and serial
number from rating label. This avoids incorrect shipments
and delays. Please refer to parts reference material when
ordering replacement parts.

Functional Operation

The glow bar system is completely reliant upon
electricity. When the oven control is turned on, 120 VAC
is provided to the glow bar ignitor and the gas valve
circuit. The high resistances of the glow bar limits the
current flow through the ignitor/gas valve. Continual
current flow through the circuit causes the glow bar
ignitor to glow brighter and the resistance of the ignitor
decreases, which increases the current flow through the
ignitor/gas valve circuit. This increases the amount of
heat generated by the heater, which causes the bi-metal
to bend.
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At a point the ignitor resistance will have increased to
approximately 3.5 amps of current flow through the
ignitor/gas valve circuit. In approximately 45 seconds the
glow bar ignitor temperature will have increased to
approximately 2650°F. the voltage drop across the gas
valve terminals will have increased to about 3 VAC, which
will indicate enough current to flow to provide enough
bi-metal heat to cause the gas valve to open providing
gas flow to the oven burner the heat from the glow bar
ignites the gas. The sensing element of the oven control
then cycles contacts within the oven control, opening and
closing to cycle the glow bar, safety valve, and burner to
maintain the desired temperature.
NOTE: This system cannot operate without electricity.
The primary components of this ignition system are:
electronic control, ignitor, and safety valve. These
components are all wired in series and although the oven
control and glow bar require 120 VAC, 60 Hz. The oven
valve operates on approximately 3 volts.
Therefore, 120 VAC should never be applied directly to
the oven valve terminals. The glow bar is the power
source for the oven valve.
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