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2.0 OPERATION
2.1 Minimum/Maximum Operating Conditions
A.
Maximum inlet air pressure: 725 psig (50 barg)
B.
Minimum inlet air pressure: 15 psig (1.0 barg)
C. Maximum inlet air temperature: 120°F (49°C)
D. Maximum ambient temperature:
Air-cooled models: 110°F (43°C)
Water-cooled models: 130°F (54°C)
E.
Minimum ambient temperature: 40°F (4°C)
On/Off
Power On
Switch
Light
Switch Legend
2.2 Start-up
IMPORTANT: Energize dryer disconnect switch (provided by
others, see NEC) 24 hours before refrigeration compressor
is started! Never use the disconnect switch to shut-down the
dryer for a extended period of time (except for repair). Failure
to follow these instructions may result in a non-warrantable
compressor failure.
NOTE: It is recommended that dryer be started 15 minutes
before compressed air flow begins.
NOTE: If there is no power to the control board for a period
of two weeks or more, it may return to the default mode.
1. Confirm On/Off Switch is in the "Off" position.
2.
Check for proper electrical voltage.
3. Energize dryer disconnect switch (see IMPORTANT note
above)
4.
For water-cooled models: after 24 hours, begin cooling
water flow.
5. Toggle ON/OFF switch to the ON position to energize
dryer. Green power-on light will illuminate.
6.
Slowly pressurize unit air side by opening inlet isolation
valve. Check for leaks.
7.
After 15 minutes, open outlet isolation valve slowly.
8.
Close air by-pass valve.
2.3 Timer Drain
NOTE: The Timer Drain LED level has been pre-programmed
at the factory for your specific dryer model. Programming is
based upon a minimum of 400 psig saturated inlet air pressure
and maximum energy efficiency. The drain open time is fixed
at one second and a small amount of air will be exhausted with
each cycle. Generally, no adjustment to the timer is required.
4
Compressor
Dew Point
On Light
Temperature
Indicator
Drain
Push-to-Test
Condensate
Draining
If water is present downstream of the dryer,
always verify that any condensate drains installed upstream of
the dryer are draining properly before attempting to readjust
the LED setting.
1.
For minimum inlet air pressures that fall between column
values, the setting for the lower pressure is recommended.
(i.e. select the 300 psi column values for 324 psi inlet pres-
sure listed in Table 1.)
2.
Where the dryer is consistently operating at less than max-
imum capacity, it may be possible to increase the LED set
point to minimize air loss. Discretionary adjustments to the
dryer should only be made on a hot, humid day when the
maximum expected air load is flowing through the dryer.
Failure to do so may prevent the condensate from draining
completely when operating under peak load conditions.
Table 1 Timed drain illuminated LED Settings
300
DHP130
3
DHP200
3
DHP300
3
DHP500
3
DHP750
2
DHP1000
1
* Recommended and pre-programmed factory settings for each model dryer.
Assumes inlet conditions with 120°F ambient and 10°F air-cooled aftercooler
approach temperature.
Table 2 Timed drain illuminated LED Settings
Minutes
LED
between
Illuminated
Drain Cycles
1
1
st
2
3
nd
3
5
rd
4
10
th
5
20
th
6
30
th
7
40
th
8
50
th
9
60
th
Inlet Pressure
400*
500
600
725
4
4
4
5
3
4
4
4
4
4
4
5
3
3
4
4
2
3
3
3
2
2
3
3
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