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ADJUSTMENT
SCREW
FIgURE 2 - WaTER REgULaTINg VaLVE
7.6.1 BASIC USER INTERFACE
The Controller provides the user with information about the
dryer’s operation and alarms.
The following illustration summarizes the keypad functions.
TYPICaL-MaY VaRY WITH DRaIN
BUTTONS
ON / OFF
Toggles the dryer operation between “On Line”
and “Off Line” status; Energizes glycol pump. Note
that the refrigeration system will operate based on
temperature.
EXCH SET
When depressed, will display the current exchanger
set point in the LCD window. While the exchanger set
point is displayed, the up and down arrows may be
used to increase or decrease the exchanger set point
temperature.
ALARM RESET
Pressing once clears the local alarm indication and
de-energizes the remote alarm contact. Should the
alarm condition persist, the alarm will return after
the alarm inhibit time has expired.
% SAVINGS
Depressing once changes LCD display to indicate
ratio of refrigeration system running time vs. total
dryer ON time.
°F / °C
Toggles the LED temperature indicators between
Fahrenheit and Celsius units of measure.
+ / -
Allows user to modify set point values. Set point
values cycle through a fixed range.
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DRAIN OPEN (SOLENOID DRAIN ONLY)
Press this button to set the length of time in seconds
that the condensate drain will be open. This is
adjustable from one (1) to sixty (60) seconds.
DRAIN CLOSED (SOLENOID DRAIN ONLY)
Press this button to set the amount of time in
minutes that the condensate drain will be closed.
This is adjustable from one (1) to sixty (60) minutes.
DRAIN TEST (SOLENOID DRAIN ONLY)
Press this button to open the drain to verify
operation.
LIgHTS
LCD Display
Displays exchanger temperature during normal
operation. Also used to display exchanger
temperature set point, alarm condition and timing
functions.
SYSTEM ENERGIZED
Indicates when power is applied to unit.
DRYER ON
Illuminated when the On/Off switch has been
pressed to place the unit in operation. The
refrigerant system may start at any time when the
light is on.
REFRIGERATION COMPRESSOR ON
Indicates that the refrigeration system is operating.
DEGREES F / DEGREES C
Indicates the temperature units of measure.
HIGH TEMP ALARM
Indicates that the exchanger temperature has risen
to 10°F or 5°C above the exchanger temperature set
point.
LOW TEMP ALARM
When activated, indicates that the exchanger
temperature has dropped below 29°F or -2°C. This
condition stops the compressor. The compressor
will not restart until the temperature has risen two
degrees above exchanger set point.
DRAIN OPEN (SOLENOID DRAIN ONLY)
This light comes on when power is applied to open
the time solenoid drain.
7.6.2 EXCHANGER TEMPERATURE SET POINT AND
ALARMS
The Controller allows the user to configure the dryer’s
Exchanger Temperature Setpoint to operate according to
site conditions. The Controller is shipped from the factory
with the exchanger temperature having a default value of
38 deg.
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7.0 PRINCIPLES OF OPERaTION
