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NORMAL OPERATION — The green NORMAL
OPERATION indicator will light when the tempera
-
ture inside the evaporator (chiller ) is normal.
CHECK OPERATING CONDITIONS — The red
CHECK OPERATING CONDITIONS indicator will
light when the temperature inside the evaporator is too
high.
SERVICE DUE — The yellow SERVICE DUE indi
-
cator will light under three conditions: as a reminder to
perform routine maintenance after 4,500 hours of
dryer service (approximately six months), when a
thermocouple, or when a filter element must be
changed.
6 Pyramid 8000
®
Series Purifiers (Bulletin 289)
Table IV
System Operation Monitor Indicating Lights
INDICATING
LIGHT
INDICATES ACTION REQUIRED NOTES
NORMAL
OPERATION
The temperature inside the evapo
-
rator (chiller) is normal.
This indicator should light within
30 minutes of start-up, after the re
-
frigeration system has stabilized.
It should remain on when the
dryer is operating.
Indicator will go off if the CHECK
OPERATING CONDITIONS indica
-
tor comes on or when a
thermocouple has failed.
CHECK
OPERATING
CONDITIONS
The temperature inside the
evaporator (chiller) is too high.
It is normal for this light to be on
when the dryer is first turned on
and remain on until the dryer has
reached normal operating tem
-
peratures (about 30 minutes).
If the CHECK OPERATING CON
-
DITIONS indicator turns on during
normal operation, turn the dryer
off to avoid compressor damage.
Have a refrigeration mechanic
identify and correct the malfunc-
tion. If the dryer is under warranty,
call your local distributor for
authorization before servicing
Indicator will remain illuminated
until problem has been corrected.
SERVICE
DUE
1. 4,500 hours of dryer service
(approximately six months) has
passed; routine maintenance
should be performed.
1. See maintenance section in this
manual for further instructions.
See maintenance section in this
manual for instructions on reset-
ting indicator.
2. A thermocouple is sensing tem
-
perature outside of normal range
or it has failed. The thermocouple
may sense temperatures outside
of normal range for up to two min
-
utes after startup or in extreme
temperature conditions. (The al
-
phanumeric display will read T1,
T2, T3, T4 or T5 MALFUNCTION.
T1 = inlet air, T2 = refrigerant
suction, T3 = refrigerant dis
-
charge, T4 = ambient air, T5 =
evaporator.)
2. Check thermocouple. Replace
if necessary.
Indicator will go off when the dryer
is turned off. This will not affect
the 4,500 hour routine mainte
-
nance indicator.
3. Pressure drop across the prefil
-
ter/separator or particulate after
filter indicates the need to replace
element.
Alphanumeric display reads CHG
SEPARATOR or CHG PARTICU
-
LATE.
1. See maintenance section in this
manual for further instructions.
Indicator will reset when pressure
drop returns to normal..
SYSTEM
ALARM
1. Inlet air temperature is too high.
Determine which temperature(s) is
out of range. See the Field Serv
-
ice Guide in this manual for possi
-
ble causes/remedies
Indicator will not stop flashing un
-
til the problem has been cor
-
rected.
2. Refrigerant suction temperature
is too low.
3. Ambient air temperature is too
low.
4. Ambient air temperature is too
high.