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2. Features
a) LED Display
The display board identifies system details and diagnostic information. A ribbon cable
connects the display board to the control board for system communication. Be sure to
keep the ribbon cable at least 1-1/2" away from high voltage leads (100VAC or more)
to protect against electrical noise.
b) Guarded Access Menu
Three settings can be viewed and changed from the guarded access menu:
Temperature Setpoint, Defrost Frequency, and Temperature Display Scale (°F or °C).
For details, see "II.D.5. Guarded Access Menu."
c) Service Menu
The service menu allows for the viewing and setting of system operating details and
parameters. For details, see "II.D.6. Service Menu."
d) Alarm Signals
Alarm signals are designed to protect the unit and food product. These alarms give
information or warnings in the event the unit is operating out of acceptable parameters.
For details, see "II.D.3. LED Lights and Alarm Safeties Chart."
e) Defrost
Main defrost control: Temperature-initiated, temperature-terminated defrost. Optional
defrost control: Time-initiated, temperature-terminated defrost.
For details, see "II.D.5.b) Defrost Frequency."
f) Default Safety Program
Cabinet Thermistor: In the event the cabinet thermistor reading is out of range, the
compressor operates on a fixed time basis of 5-minutes on and 5-minutes off.
Defrost Thermistor: In the event the defrost (evaporator) thermistor reading is out
of range, defrost initiation occurs every 6 hours and terminates at 40°F cabinet
thermistor temperature.
Cabinet and Defrost Thermistor: In the event both thermistor readings are out of
range, the compressor operates on a fixed time basis of 5-minutes on and 5-minutes
off and a defrost cycle initiates every 6 hours and terminates after 45 minutes. For
further details, see "IV.C. Thermistor Check."
g) High Voltage and Low Voltage Cut-outs
The maximum and minimum allowable supply voltages of this unit are limited by the
high and low voltage cut-outs.
If high voltage (140VAC±5% or more) is present, the unit automatically stops and the
control board signals with "E6" display and 8-beep alarm every 3 seconds.
If low voltage (92VAC±5% or less) is present, the unit automatically stops and the
control board signals with "E7" display and 9-beep alarm every 3 seconds.
When the proper supply voltage is resumed, the unit automatically starts running
again.
