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
0.5sec 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.
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 Fp x Ft x Fa
Table VII
Purifier Sizing Correction Factors
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
Inlet Air
Pressure
psig | Factor | |
Fp | ||
|
500.56
600.65
700.74
800.83
900.91
100 1.00
110 1.02
125 1.06
150 1.11
Inlet Air
Temperature
°F | Factor | |
Ft | ||
| ||
| ||
1100.74
1200.56
Ambient Air Temperature
°F | Factor | |
Fa | ||
|
1001.00
1050.97
1100.94
1150.91
1200.88
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 |
|
|
Start-Up
Once installation is completed as directed and proper airflow is determined, the purifier is ready for
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
1.Turn the
2.Supply power to the purifier and let the crankcase heater warm up for four hours.
Pyramid 8000® Series Purifiers (Bulletin 289) | 9 |
