8
SIZING
Determining dryer capacity at actual operating conditions
To determine the maximum inlet flow capacity of a dryer at
various operating conditions, multiply the rated capacity from
Table 1 by the multipliers shown in Table 2.
Example: How many scfm can an air-cooled model 400 handle
when compressed air to be dried is at 200 psig and 100°F;
ambient air temperature is 80°F?
Answer: 400 x 1.22 x 1.12
= 547 scfm.
3.0 MAINTENANCE
3.1 Condenser coil – Clean off accumulated dust and dirt
monthly.
3.2 Moisture separator – Replace filter element when
pressure drop across dryer is excessive or annually.
3.3 Check separator daily to be sure automatic drain is
discharging.
3.4 Blow down separator weekly by pushing test button
on control panel.
3.5 Rebuild drain mechanism annually.
To facilitate service, maintenance kits are available.
Models 100-150
Drain Line
PTC Swivel Elbow
Element
Wave Spring
Float Drain
Element O-Ring
Bowl O-Ring
Head
Models 200-750
Head
Element O-Ring
Bowl O-Ring
Element
Bowl
Drain Quick Disconnect
Bowl Support
*Models 500-750 Only.
INLET COMPRESSED AIR CONDITIONS
INLET INLET TEMPERATURES
PRESSURES 80°F 90°F 100°F 110°F 120°F
psig kgf/cm
2
27°C 32°C 38°C 43°C 49°C
50 3.5 1.35 1.05 0.84 0.69 0.56
80 5.6 1.50 1.17 0.95 0.79 0.66
100 7.0 1.55 1.23 1.00 0.82 0.70
125 8.8 1.63 1.31 1.07 0.91 0.74
150 10.5 1.70 1.37 1.13 0.95 0.80
175 12.3 1.75 1.42 1.18 0.99 0.84
200 14.0 1.80 1.47 1.22 1.03 0.89
TABLE 2
Air capacity correction factors (Multipliers)
COOLING MEDIUM*
AMBIENT
TEMPERATURE MULTIPLIER
°F °C
80 27 1.12
90 32 1.06
100 38 1.00
110 43 0.94
*Air-cooled models; water-cooled models use 1.15 multiplier if cooling water is
below 35°C, 95°F.
TABLE 1
Rated capacity (scfm) and pressure drop @ 100 psig inlet
pressure, 100°F inlet temperature, and 100°F ambient
temperature
MODEL 100 125 150 200 250
Rated capacity 60 Hz 100 125 150 200 250
of air-cooled 50 Hz 84 105 125 170 210
models (scfm)
MODEL 300 400 500 600 750
Rated capacity 60 Hz 300 400 500 600 750
of air-cooled 50 Hz 250 340 420 540 630
models (scfm)
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