Ingersoll-Rand DXR Series Operator's Instruction Manual page 7

INDICATING
LIGHT
NORMAL The temperature inside the evaporator
OPERATION (chiller) is normal.
CHECK
The temperature inside the evaporator
OPERATING
(chiller) is too high.
CONDITIONS
1. 4,500 hours of dryer service
(approximately six months) has
passed; routine maintenance should
be performed.
2. A temperature sensor probe is
sensing temperature outside of normal
range or probe has failed. The probe
SERVICE
may sense temperatures outside of
DUE
normal range for up to two minutes
after startup or in extreme temperature
conditions. (The alphanumeric display
will read T1, T2, T3, T4 or T5
MALFUNCTION. T1 = inlet air, T2 =
refrigerant suction, T3 = refrigerant
discharge, T4 = ambient air, T5 =
evaporator.)
1. Inlet air temperature is too high.
2. Refrigerant suction temperature is
SYSTEM
too low.
ALARM
3. Ambient air temperature is too low.
4. Ambient air temperature is too high.
• refrigerant suction
• refrigerant discharge
• ambient air
The display can be programmed to automatically scan
each temperature for five seconds in sequence or to con-
tinuously display any selected reading. The correspond-
ing light on the system schematic will illuminate when
the temperature is displayed.
To scan the temperatures (normal mode): press and
hold the SCAN/SEEK button for three seconds. Each
temperature will then be displayed for five seconds in
the following sequence: inlet air, refrigerant suction, re-
frigerant discharge and ambient air. To stop the scan
mode push the TIME ADJUST button once.
DXR Series Dryers (Bulletin 553)
SYSTEM OPERATION MONITOR INDICATING LIGHTS
INDICATES
Table 3
ACTION REQUIRED
This indicator should light within 30 minutes
of start-up, after the refrigeration system has
stabilized. It should remain on when the dryer
is operating.
It is normal for this light to be on when the
dryer is first turned on and remain on until
dryer has reached normal operating
temperatures (about 30 minutes).
If the CHECK OPERATING CONDITIONS
indicator turns on during normal operation,
turn the dryer off to avoid compressor
damage. Have a refrigeration mechanic
identify and correct the malfunction. If the
dryer is under warranty, call your local
distributor for authorization before servicing
1. See maintenance section in this manual for
further instructions.
2. Check sensor probe. Replace if necessary.
Determine which temperature(s) is out of
range. See Table 5 and the Field Service
Guide in this manual for possible
causes/remedies
To display any selected temperature (seek/test
mode): press the SCAN/SEEK button once. The display
will read the same temperature until the button is
pressed again. When in seek mode, it will continue to
monitor for abnormal conditions.
Critical Air and Refrigerant Temperatures
Table 4 provides the normal range for each displayed
temperature when the dryers are operated in accordance
with specified conditions. If a temperature reaches the
warning set point indicated in the table, the correspond-
ing light on the system schematic will flash during the
5-second display. If the temperature reaches the alarm
set point indicated in the table, the System Alarm indi-
cator will flash. Refer to the Field Service Guide in this
NOTES
Indicator will go off if the
CHECK OPERATING
CONDITIONS indicator
comes on or when a
temperature sensor
probe has failed.
Indicator will remain
illuminated until
problem has been
corrected.
See maintenance
section in this manual
for instructions on
resetting indicator.
Indicator will go off
when the dryer is turned
off. This will not affect
the 4,500 hour routine
maintenance indicator.
Indicator will not stop
flashing until the
problem has been
corrected.
1-5