Technical information
12/01/02
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MANUAL RESET SAFETIES:
The Alpine control board has one manual reset safety. It is
the 127°F high evaporator temperature safety. There is no
indication that the Alpine board is off on this safety. You
will only notice that the unit will restart in the 1 minute fill
cycle when the power switch is shut OFF and Back ON.
This is the only way to reset this safety. If this occurs
check for a hot gas circuit or valve problem, a headmaster
stuck in bypass, hot water entering the unit, or a shorted
thermistor. In case of a shorted thermistor, the unit will not
restart. You will hear a relay click after approximately 2
seconds and the unit will remain off.
The “E” control board can have up to 5 manual reset safe-
ties. They are outlined in the control board function label.
These safeties shut the unit down and assist the service
technician in diagnosing the problem.
The safeties include audible and visual alarms as follows:
1 Beep = 127ºF (52.8ºC) high evaporator temp. safety.
2 Beeps & orange LED = 2 consecutive 20 minute harvest
cycles.
3 Beeps & yellow LED = 2 consecutive maximum freeze
cycles.
4 Beeps = Short circuit on mechanical bin control circuit.
5 Beeps = Open circuit on mechanical bin control circuit.
To reset either safety, press the white reset button
on the control board with the power ON. Next, pro-
ceed to check the items outlined on the function label.
The items listed on the function label represent the most
common reasons that the safety would function. There
may be other remote possibilities however, the items listed
should be checked first.
VOLTAGE PROTECTION:
Built-in voltage protection for the “E” board will automati-
cally shut the unit down and beep if either a high or low
voltage problem occurs as follows:
6 Beeps = Low voltage condition.
7 Beeps = High voltage condition.
The high and low voltage protections are the only board
alarms that will automatically restart the unit when the volt-
age returns to normal. If constant voltage fluctuation oc-
curs, additional external voltage protection will be required.
12/20/03
2/20/03