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7.6.3 ADJUSTING SET POINTS
Accessing and manipulating the Exchanger Temperature
Setpoint is accomplished as follows.
EXCH.
SET
36
Pressing EXCHANGER SETPOINT button will change the
display to show the current setpoint.
37
Pressing the UP or DOWN arrows modifies the EXCHANGER
SETPOINT in one degree increment.
38
Pressing the UP or DOWN arrows modifies the EXCHANGER
SETPOINT in one degree increment.
38
The Controller accepts the last setpoint. After 5 seconds,
the readout will return to displaying the current Exchanger
Temperature.
CaUTION
Do not set the Exchanger Temperature greater
than 50 deg.F. Running dryer at an Exchanger
Temperature higher than 50 deg.F may damage
refrigeration system.
7.6.4 ALARMS AND THEIR FUNCTIONS
The Controller indicates critical alarms to alert the user of
an out of tolerance condition. Once each alarm condition is
detected, the appropriate LED indicator will illuminate and
the remote alarm contact will close.
Alarm
Display
Alarm Set Point
HIGH
TEMPERATURE
ALARM
HI TEMP ALARM
EXCH SE
10 °F
LOW
TEMPERATURE
ALARM
LOW TEMP ALARM 28 °F
The alarm names and a brief description of each are
described in detail below.
HIGH TEMPERATURE ALARM
When the thermal mass (glycol) temperature reaches the
alarm set point, the alarm will be activated. This alarm
condition may not necessarily damage the dryer when
subjected to long-term exposure. It may, however, have
a significant impact on downstream processes and thus
should be investigated upon detection. Note that this alarm
will not shut down the dryer. This alarm will activate the
remote alarm contact and reset automatically once the
alarm condition is rectified.
LOW TEMPERATURE SAFETY ALARM
If the dryer chiller temperature falls below the factory set
point, the alarm routine will activate. This alarm condition
may cause damage to the dryer when subjected to
continuous or long-term exposure. Note that this alarm
will shut down the dryer after a response time delay. This
alarm will activate the remote alarm contact and reset
automatically once the alarm condition is rectified.
7.6.5 ALERT MESSAGES
The Controller features the following readouts to
communicate the status of the dryer’s operation.
P F
Indicates a probe failure. This condition
is usually caused by a probe being
unplugged, damage to the probe lead or
a defective probe.
C D
Indicates that the refrigerant compressor
will not start until the end of a three
minute safety delay. The display of “cd” is
immediately followed by the number of
minutes left in the delay. This is a normal
function of the controller and not a fault
indication.
7.6.6 START MODES
The NCV200-400 dryers are capable of starting in one of the
following start modes:
7.6.6.1 Manual Mode
After power is supplied to the dryer, the LCD display
will indicate the chiller temperature as well as the time
remaining for the safety delay. Once the delay has
timed out, depressing the On/Off button will permit
the refrigeration system to operate. Should the chiller
temperature be greater than the set point, the refrigeration
system will energize. Should the chiller temperature be
below the set point, the refrigeration system will remain off
until the chiller temperature rises to the setpoint.
7.6.6.2 Remote Mode (Optional)
This mode of operation allows the user to control the
dryer remotely and requires the installation of a customer-
supplied contact. With power applied to the dryer and once
the safety delay has timed out, the dryer will start once the
remote switch is closed. In addition, this mode of operation
7.0 PRINCIPLES OF OPERaTION
