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SYSTEM ALARM — The red SYSTEM ALARM
indicator signals air system or dryer operating condi
-
tions that may affect dew point performance or cause
damage to the dryer.
Temperature SCAN/SEEK Push Button
The SCAN/SEEK push button on the System Opera
-
tion Monitor provides a readout on the alphanumeric
display of the following temperatures:
•
inlet air
•
refrigerant suction
•
refrigerant discharge
•
ambient air
The display can be programmed to automatically scan
each temperature for five seconds in sequence or to
continuously display any selected reading. The corre
-
sponding light on the system schematic will illuminate
when the temperature is displayed.
To scan the temperatures (normal operation): press
and hold the SCAN/SEEK button for three seconds.
Each temperature will then be displayed for five sec-
onds in the following sequence: inlet air, refrigerant
suction, refrigerant discharge and ambient air. To stop
the scan mode, press the TIME ADJUST button once.
To display any selected temperature (seek;
test/check mode): press the SCAN/SEEK button once.
The display will read the same temperature until the
button is pressed again. While in this mode, the alarm
set points and service due light are bypassed.
Critical Air and Refrigerant Temperatures
Table V provides the normal range for each displayed
temperature when the dryers are operated in accor
-
dance with specified conditions. If a temperature
reaches the warning set point indicated in the table,
the corresponding light on the system schematic will
flash during the five second display. If the temperature
reaches the alarm set point indicated in the table, the
System Alarm indicator will light. Refer to the Field
Service Guide in this manual if any temperature read
-
out falls outside the normal range.
Inlet Air Temperature — If the inlet air temperature
falls outside the normal range, the dryer may fail to
achieve the required dew point. Check the compressor
aftercooler and adjust aftercooler operation to ensure
specified inlet air temperature to the dryer.
Refrigerant Suction Temperature — If the dryer has
been operating for more than 20 minutes and the re-
frigerant suction light flashes, there may be a malfunc-
tion in the refrigeration system. Turn the dryer off and
have a refrigeration mechanic identify and correct the
malfunction. If the dryer is under warranty, call your
local distributor for authorization before servicing.
Pyramid 8000
®
Series Purifiers (Bulletin 289) 7
Table V
Air and Refrigerant Temperatures
DIGITAL
DISPLAY
THERMOCOUPLE
LOCATION
COMMENTS
NORMAL
TEMPERATURE
RANGE
WARNING
SET
POINT
ALARM SET
POINT
Inlet Air Inlet air piping
Inlet air temperature varies with
changes in aftercooler cooling
medium temperature and air
compressor unloading. Inlet tem
-
peratures higher than 100°F re
-
duce drying capacity.
40°F – 120°F 100°F 120°F
Refrigerant
Suction
Refrigerant line up
-
stream of compres
-
sor
These refrigerant temperatures
vary with the refrigeration load
and are controlled by refrigera
-
tion valve settings. These read
-
ings are used primarily by service
personnel to analyze refrigeration
system performance.
32°F – 55°F N.A. 25°F
Refrigerant
Discharge
Refrigerant line
downstream of
compressor
160°F – 240°F N.A. N.A.
Ambient Air
Outside the con
-
denser
Ambient air temperatures higher
than 100°F will reduce drying ca
-
pacity.
35°F – 120°F
> 100°F/
< 35°F
> 120°F/
< 35°F
Intermediate
Air
Outside surface of
chiller discharge
piping
Intermediate air temperature var
-
ies with inlet air pressure, ambi
-
ent temperature and airflow. This
reading is used primarily by serv
-
ice personnel to analyze refrig
-
eration system performance.
Variable; see
Table VI
N.A. N.A.