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AUTOMATIC DRAIN VALVES (ADVs)
8DM Series purifiers are equipped with two electronic
automatic drain valves (ADVs) that automatically dis
-
charge condensate from the coalescing filter. Drain
valve controls for one drain are on the front panel.
Controls for the second ADV are on the drain valve.
ADV operation is controlled by an electronic timer.
The front panel ADV controls allow the period of
drain opening (labeled DWELL SEC.) to be set from
0.5 sec to 10 sec and the drain cycle (labeled INTER
-
VAL MIN.) to be set from 0.5 min to 60 min. The con
-
trols for the second ADV allow the period of drain
opening to be set from 0.5 sec to 10 sec and the drain
cycle to be set from 0.5 min to 45 min.
Each ADV has a test button to help check ADV opera
-
tion. When the button is pushed, the drain port will
click open with a clearly audible sound.
ADV Adjustment
To minimize air losses, the ADV timer should be ad-
justed to open the drain port just long enough to dis-
charge accumulated condensate. The timer is properly
set if only air discharges at the end of the open period.
If air discharges for longer than one second, set the
timer for a longer cycle or a shorter opening. If liquid
is discharging while the port is closing, set the timer
for a shorter cycle or a longer opening.
OPERATION
Airflow
8DM Series purifiers are rated at 100°F ambient air
temperature, 100°F inlet air temperature, 100 psig inlet
air pressure and 100% inlet relative humidity. Purifier
capacity at these conditions is as follows:
Model Capacity (scfm)
8DM25 25
8DM50 50
8DM75 75
8DM100 100
8DM150 150
WARNING
High airflow, high inlet air temperature or low
inlet air pressure may cause poor purifier
performance,illness, injury or death. If the
purifier is operated at conditions different
from the rating conditions, adjust the inlet air
flow.
To determine adjusted inlet air flow, use the following
formula and the correction factors in Table VII.
Maximum Flow = Flow at Rating Conditions
x F
p
x F
t
x F
a
Table VII
Purifier Sizing Correction Factors
Inlet Air
Pressure
Inlet Air
Temperature
Ambient Air
Temperature
psig
Factor
F
p
°F
Factor
F
t
°F
Factor
F
a
50
0.56
80-100
1.00
100
1.00
60
0.65
110
0.74
105
0.97
70
0.74
120
0.56
110
0.94
80
0.83
115
0.91
90
0.91
120
0.88
100
1.00
110
1.02
125
1.06
150
1.11
Start-Up
Once installation is completed as directed and proper
airflow is determined, the purifier is ready for start-up.
WARNING
Compressed air and compressed air equip
-
ment can be dangerous unless safety pre
-
cautions are observed. Anyone who works
with this equipment must read and carefully
follow these instructions.
Models 8DM75, 8DM100 and 8DM150 include a
crankcase heater in the refrigeration circuit. The first
three steps of this start-up procedure apply only to
these models.
1. Turn the front-panel power switch OFF.
2. Supply power to the purifier and let the crankcase
heater warm up for four hours.
Pyramid 8000
®
Series Purifiers (Bulletin 289) 9