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INSTRUMENTATION
ON/OFF Switch
The dryer is equipped with an ON/OFF switch on the front panel.
A light signals when the dryer is on.
Dew Point Indicator
(75 through 150 scfm models)
All dryers are equipped with a dew point indicator which indi-
cates dryer conditions as follows:
It is normal for the dew point indicator to be in the red zone
when the dryer is first turned on and then move to the green
zone when the dryer reaches its normal operating temperature.
If this indicator is in the red zone during normal operation,
turn the dryer off to avoid compressor damage. Refer to the
Field Service Guide for additional information, or call your local
distributor.
Dew Point Indicator
(Models RGD75A1, RGD100A1, RGD125A1 and RGD150A1)
Dryer System Monitor (DSM)
(200 through 500 scfm models)
The Dryer System Monitor (DSM) has LED type dew point tem-
perature indicator and operating time control for the electronic
drain valve. When the dryer is running normally, the green LED
will illuminate. If the red LED is illuminated, there is a need for
the dryer's operating condition to be checked. If all LEDs are
illuminated, the sensor for the dew point temperature indicator
has malfunctioned.
The automatic drain valve controls allow the period of drain
opening to be set from 1 second to 9 seconds and drain valve
closed time to be set from 0.5 minutes to 15 minutes. When the
Drain Push-to-Test button (5) is pushed for one (1) second, the
Drain LED (6) will illuminate and the drain port opens with a click.
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1
3
7
Dryer System Monitor
(Models RGD200A4, RGD250A4, RGD300A4, RGD400A4 and RGD500A4)
1.
On/Off Switch: Press the top of the switch (I) to turn
the dryer on. Press the bottom of the switch (O) to
turn the dryer off. When the dryer is on, the switch
is illuminated.
2.
Dew Point Temperature Indicator: Main portion of
the graphic for the dew point temperature scale.
Green indicates low, red indicates high.
3.
Compressor On Light / On Time Setting Mode: Dual
purpose LED indicating light. Illuminates as solid light
when compressor is ON. Blinks On and Off during
setup of the On Time Set Points for the Automatic
Drain Valve.
4.
Selection Button: During set up of the Automatic
Drain Valve, When pressed, sequences from left to
right.
5.
Drain Push-to-Test Button / Enter Button:
a) Drain Push-to-Test button. When the button is
pressed, the drain valve opens for the time corre-
sponding to the setting established during Drain
Valve setup.
b) Enter button. Stores the "On Time" and "off Time'
drain valve settings established during Drain Valve
setup
6.
Drain LED / Off Time Setting Mode: Dual purpose LED
indicating light. Illuminates as solid light when Drain
is closed. Blinks On and Off during setup of the Off
Time Set Points for the Automatic Drain Valve.
7.
This is a graphic symbol for the Air Dryer compres-
sor. It simply indicates that the switch is used to turn
the compressor (dryer) on and off.
8.
Part of the graphic for the dew point temperature
scale. The snowflake indicates the low (cold) end of
the scale.
9.
Part of the graphic for the dew point temperature
scale. The thermometer indicates the high (hot) end
of the scale.
10. This is a graphic symbol for the Drain Valve.
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9
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5
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