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LOW TEMPERATURE SAFETY ALARM (LOWTEMP ALARM)
If the dryer chiller temperature falls to or below the factory
set point and remains at or below this set point for the
factory delay time, 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.
HIGH PRESSURE CUTOUT ALARM (HPCO ALARM)
If the discharge pressure of the refrigerant is determined
to be above the 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. The operator must depress the RESET button in order
to clear the alarm and restart the refrigeration system.
LOW PRESSURE CUTOUT ALARM (LO PRESS CO)
If the suction pressure of the refrigerant is determined to be
below the set point of the LPCO alarm, the Microprocessor
Control alarm routine will activate. This alarm condition may
cause damage to the dryer when subjected to continuous or
long-term exposure. Note that once cleared, the compressor
will restart automatically. However, if two successive
lowpressure conditions are determined, this alarm will shut
down the dryer after a response time delay and will display
the alarm condition. The operator must depress the RESET
button in order to reinstate the compressor.
Parameter
R-404A
FAN 1 ON
275 psig
FAN 1 OFF
195 psig
FAN 2 ON
335 psig
FAN 2 OFF
235 psig
HPCO (Air Cooled)
450 psig
HPCO (Water Cooled)
320 psig
LPCO
20 psig
TABLE - 1
7.6.6 START MODES
Ingersoll Rand
dryers are capable of starting in one of
three start modes. Note that to protect the refrigeration
compressor from repeated rapid starts, the Microprocessor
Control is equipped with an an anti-short cycle (ASC) delay.
The ASC delay will countdown from the factory set point.
Only after the ASC delay has timed out will the refrigeration
system operate. Below are brief descriptions of these various
start modes.
7.6.6.1 Manual Mode
Ingersoll Rand
dryers are shipped from the factory in the
Manual Mode. After power is supplied to the dryer, the user
will be presented with the ASC delay, followed by the “PRESS
ON BUTTON” display. After the ASC delay has timed out, the
dryer will only start once the ON button is depressed. In this
configuration, to restart the dryer, the user must manually
depress the ON button on the dryer’s control panel.
7.6.6.2 Auto Restart Mode
After power is applied to the dryer, and once an anti-short
cycle delay has timed out, the dryer will start automatically.
In addition, this mode of operation allows manual control
of the dryer via the ON & OFF pushbuttons. This is useful
for applications where automatic restarting of the dryer is
desired after a power failure has occurred.
7.6.6.3 Remote Automatic Mode
This mode of operation allows the user to control the
dryer remotely and requires the installation of a customer-
supplied contact and grounded 24V power supply. With
power applied to the dryer and once the anti-short cycle
delay has timed out, the dryer will start automatically once
the switch is closed. In addition, this mode of operation
allows manual control of the dryer via the ON & OFF
pushbuttons.
7.0 PRINCIPLES OF OPERATION
120.26A D4290NCHPW400F Installation Operation and Maintenance Manual
