Ingersoll-Rand D1700IN, Operator'S Manual

Page: 11 / 32

Non-cycling Refrigerated Dryer 11
MODELS D1700IN, D2040IN, D2720IN, D3400IN, D4080IN
ingersollrandproducts.com
7.0 PRINCIPLES OF OPERaTION
7.5.5 ALARMS AND THEIR FUNCTIONS
There are several alarms detected by the Microprocessor
Control to alert the user of an out of tolerance condition.
Once each alarm is detected, a description of the alarm will
appear in the screen and the remote alarm contact will close.
Note that during the alarm condition, the SELECT DISPLAY
button may be depressed to scroll through the available
parameters. After approximately 30 seconds, the alarm
screen will reappear, provided the alarm condition persists.
The alarm names and a brief description of each are
described in detail below.
alarm Display alarm Set
Point
HIGH PRESSURE
CUTOUT
HPCO ALARM See Table 1
LOW PRESSURE CUTOUT LPCO ALARM See Table 1
HIGH TEMPERATURE
ALARM
HITEMP ALRM 55 °F
LOW TEMPERATURE
ALARM
LOTEMP ALRM 30 °F
HIGH TEMPERATURE ALARM (HITEMP ALARM)
When the exchanger 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 (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 low
pressure 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
7.5.6 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 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.
7.5.6.1 Manual Mode
Ingersoll Rand dryers are shipped from the factory in the
Manual Mode. After power is supplied to the dryer and once
the Crankcase Heater Delay has timed out, 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.
7.5.6.2 auto Restart Mode
After power is applied to the dryer, and once the Crankcase
Heater and ASC delays have 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.
7.5.6.3 Remote automatic Mode
This mode of operation allows the user to control the
dryer remotely and requires the installation of a customer-
supplied contact. With power applied to the dryer and once
the Crankcase Heater and ASC delays have 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. Note that the
signal to the remote contact must be 24V.