4
Automatic Drain Valve
All models are equipped with an electronic drain valve that au-
tomatically discharges condensate from the dryer. Drain valve
operation is controlled by a drain valve timer. The drain opening
can be set from 0.5 seconds to 9 seconds. The drain cycle can
be set from 0.5 minutes to 15 minutes.
Models 75 through 150 have the timer mounted directly on
the drain valve.
For models 200 through 500, drain valve adjustments are made
on the Dryer System Monitor:
1. Press the Selection (4) and Enter (5) buttons at the same
time for 3 seconds, the On Time Setting Mode LED (3) will
start to blink, and the illuminated LED on the Dew Point
Temperature Indicator LED (2) will identify the factory set-
ting for "On Time". (See table)
2. Press and release the Selection button (4) to sequence from
left to right until reaching your selection. The red LED is
not used.
3. To store the "On Time", press the Enter button (5) and set
the "Off Time" using step 2.
4. To store the "Off Time", press the Enter button (5) again.
5. Exiting the Program will cause the Timer Drain to discharge
and begin a new cycle.
NOTE:
Failure to perform step 3 within 10 seconds of complet-
ing step 2 will cause the unit to revert back to the previous
setting.
LED (2)
Position
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
On
Time
(sec)
1
2
3
4
5
6
7
8
Continuous
(Drain Trap
Option)
Off
Time
(min)
0.5
1
2
3
5
7
9
10
15
Electronic Drain Valve Adjustment
The automatic drain valve has been pre-programmed at the
factory for your specific RGD Series dryer. Programming is
based upon a minimum of 100 psi saturated inlet air pressure
and maximum energy efficiency. Generally no adjustment to
the timer is necessary.
CAUTION:
If water is present downstream of the dryer, always
verify that and condensate drains installed upstream of the
dryer are draining properly before attempting to adjust the
timer settings.
1. For minimum inlet air pressures that fall between column
values the setting for the lower pressure is recommended.
(i.e. select the 100 psi column values for 124 psi inlet pres-
sure.)
2. Where the dryer is consistently operating at less than
maximum capacity, it may be possible to alter the timer set
points 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.
Dryer Model
Inlet Pressure (psig)
75
100*
125
150
200
225
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
(sec) (min) (sec) (min) (sec) (min) (sec) (min) (sec) (min) (sec) (min)
RGD75A1
2
3
2
3
2
5
2
6
2
9
2
9
RGD100A1
2
2
2
2
2
4
2
6
2
7
2
9
RGD125A1
2
2
2
2
2
3
2
5
2
6
2
7
RGD150A1
2
1
2
2
2
3
2
4
2
6
2
7
RGD200A4
2
5
2
5
2
7
2
9
2
9
2
9
RGD250A4
2
4
2
4
2
6
2
9
2
9
2
9
RGD300A4
2
3
2
3
2
5
2
7
2
9
2
9
RGD400A4
2
2
2
2
2
4
2
6
2
9
2
9
RGD500A4
2
2
2
2
2
4
2
5
2
7
2
9
* Recommended and pre-programmed factory settings for each RGD Series
model dryer.
Assumes dryer operates at ISO 7183 (Option A2) conditions: 100°F inlet air tem-
perature, 100 psig operating pressure, 100°F ambient air temperature and 10°F
air-cooled after-cooler approach temperature.
3
4
2
1
5
Drain Timer
(Models RGD75A1, RGD100A1, RGD125A1 and RGD150A1)
1. Adjustment knob for the drain valve open time. The
values on the dial correspond to the time in seconds
that the valve is open in each drain cycle.
2. Adjustment knob for the drain valve closed time. The
values on the dial correspond to the time in minutes
that the valve is closed in each drain cycle.
3. LED to indicate when the drain valve is open.
4. Drain test button. When the button is pressed, the
drain valve opens for the time corresponding to the
setting on item 1.
5. LED to indicate when the drain valve is closed.
Summary of Contents for RGD Series
Page 23: ......
