99
Warmer drawer:
Warmer drawers are use to hold food at 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:
The warmer drawer circuit operates in two cycles: Preheat
and Hold.
Preheat or the first cycle is controlled by the low limit
thermostat which is set to open at about 150° F and
reclose at about 140° F. The low limit thermostat is
connected electrically in parallel with the diode and
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 150° F. After the first
cycle and during the holding cycles, the warmer drawer
temperature is 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 cycles. This allows the warmer drawer to
operate at a lower temperature during the hold cycle.
Troubleshooting:
There are five ways a warmer drawer control system can
fail with a standard infinite switch:
1.
The element does not heat.
2.
The element heats during preheat, then stays off
until the temperature drops to about 130° F.
3.
The switch does not cycle the element off in the
hold cycle.
4.
Slow preheating.
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
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
switch. If the wiring is good, the low limit thermostat
is defective, and either the diode or the switch is
also defective.
L1
N
Warmer Sw.
L1 H1
Lock Sw.
Indicator Light
Com NC
Element
Diode
Low Limit
Thermo
Warmer Sw.
H2 L2
Summary of Contents for 30" Electric/Microwave Combination Wall Oven
Page 44: ...44 SAMPLE SCHEMATIC FOR ES100 CONTROL SYSTEM ...
Page 51: ...51 SAMPLE SCHEMATIC FOR THE ES 200 CONTROL SYSTEM ...
Page 60: ...60 SAMPLE SCHEMATIC FOR THE ES 300 CONTROL SYSTEM ...
Page 70: ...70 SAMPLE SCHEMATIC FOR THE ES 400 CONTROL SYSTEM ...
Page 80: ...80 SAMPLE SCHEMATIC FOR THE ES 450 CONTROL SYSTEM ...
Page 98: ...98 L1 L2 N GND Sample schematic for PRC Glass touch control system ...
Page 139: ...139 NOTES ...
Page 140: ...140 ...
