Warmer Drawer; To Set The Warmer Drawer Control; How The Warmer Drawer Circuit Works; Troubleshooting - Electrolux Next Gen 30" Service Manual

WARMER DRAWER

The warmer drawer is used to hold food at a serving
temperature usually between 160°F to 190°F.
To Set the Warmer Drawer Thermostat Control:
The thermostat control is used to select the temperature
of the warmer drawer. It is located on the control panel.
To set the thermostat, push in and turn the knob to the
desired setting. The temperatures are approximate, and
are designated by HI, MED and LO.
1. Turn the knob to select the desired temperature
setting.
2. For best results, preheat the drawer before adding
food. An empty drawer will preheat in approximately
15 minutes.
3. Turn the thermostat control to OFF after use.

How the Warmer Drawer Circuit Works:

L1
Warmer Sw.
Lock Sw.
H1
L1
Com NC
Indicator light
The warmer drawer circuit operates in two cycles:
Preheat and Hold. The first cycle, preheat, is controlled
by the low limit thermostat which is set to open at about
200°F and reclose at about 130°F. The low limit thermostat
is connected electrically in parallel with the diode and
Warmer Sw.
L2
H2
Element
Diode
Low
Limit Therm.
cycling contacts of the warmer switch. No matter where
the warmer knob is set during the first cycle, the
temperature will always go to about 200°F. The hold
cycle begins after the initial first cycle when the warmer
drawer temperature is then controlled by the cycling
contact of the warmer drawer switch. The diode is placed
in the circuit to lower the power to the element by about
30% during the holding cycle. This allows the warmer
drawer to preheat faster, and then operate at a lower
temperature during hold.

Troubleshooting:

There are five ways a warmer drawer control system with
a standard infinite switch can fail:
1. The element does not heat.
2. The element heats during preheat, then stay off until
the temperature drops to about 130°F.
3. The switch does not cycle the element off in the
holding cycle.
4. Slow preheat.
5. The element operates correctly, but the indicator light
does not glow.

If the element does not heat:

1. Check to see if the indicator light is glowing. If the
indicator is not glowing remove the back panel of
the backguard and measure the voltage drop between
terminal L1 on the switch to neutral. If the meter
reads zero the lock switch or the wiring to the lock
switch is open. If the meter reads line to neutral
voltage (120 VAC) go to step 2.
2. Turn the switch on and measure the voltage drop
N
between terminal H1 on the switch and neutral. If
the meter reads zero the switch is defective. If the
meter reads line to neutral voltage the indicator light
or the wiring to the indicator light is defective. Correct
the indicator light problem and go to step 3.
3. Remove the warmer drawer and measure the voltage
drop across the terminals of the element. If the meter
reads line to neutral voltage the element is defective.
If the meter reads zero go to step 4.
4. Measure the voltage drop from each terminal of the
element to neutral. If the meter reads zero on both
terminals the wire from terminal H1 on the switch to
the element is open. If the meter reads line to neutral
voltage, check the wiring to the low limit thermostat,
the diode, and the cycling portion of the warmer
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