Automatic Drain Valves (Advs); Start-Up - Gardner Denver RCD Series Instruction Manual

In this mode, the compressor will run only if the following
conditions are met:
• Process Control Temperature > Adjustable dew point
value*
• Freeze Protection < 25°F
• High pressure switch closed (no "HiP alarm)
• Dryer on mode
• Delay timer expired
• No high or low temperature* alarms
*If the compressor is on, then the process control
temperature must drop below the process control
temperature set point before the compressor will turn
off. If the compressor is off, then the process control
temperature must rise above the set point before the
compressor will turn on.
Percent Savings LED
Calculation of savings realized with cycling design com-
pared to direct expansion design. These savings are ex-
pressed in percent of compressor on time to dryer on time.
This mode is display only. No adjustments can be made.
High Pressure "HiP" Alarm
A high pressure alarm occurs if the high pressure switch
opens and the display shows "HiP." During this condition,
the compressor will shut down. The dryer cannot be re-
started until this switch is manually reset.
To reset the high pressure switch:
1. Shutdown the dryer per the Shutdown procedure on
page 1-11.
2. Remove the dryer front panel.
3. Press the "Manual Reset" switch near the electrical
enclosure.
4. Replace the dryer front panel.
5. Restart the dryer according to the Start-up proce-
dure.
If this alarm cannot be reset or occurs frequently, consult
your local representative before servicing the dryer.

AUTOMATIC DRAIN VALVES (ADVs)

Energy Saving Cycling dryers are equipped with an elec-
tronic-timer controlled drain valve (ADV) that automatically
discharges condensate from the dryer. Controls for the dryer
drain valve are on the Controller Membrane Panel.
All models are equipped with a strainer/isolation valve ahead
of the drain valve on the separator. The strainer prevents
large particles from entering the valve. The isolation valve
1 - 10
allows servicing of the strainer and valve without shutting
the dryer down.
The ADV has two LED indicators and a test button to help
verify operation. Pushing the test button causes the drain
port to click open. One LED indicates that power is sup-
plied to the ADV; the other LED indicates that the drain port
is open. The power indicator turns off when the drain port
opens. If either LED fails to turn on at the proper time, refer
to the Maintenance section of this manual. If the dryer is
under warranty, call your local distributor for authorization
before servicing.
To minimize air losses, set the timer so that only air dis-
charges at the end of the open period. Recommended ini-
tial settings are a 3-second drain on time and a 4-minute
drain off time. If air discharges for more than one second,
set the timer for a longer cycle or a shorter opening. If liq-
uid discharges as the port is closing, set the timer for a
shorter cycle or a longer opening.

START-UP

Once the dryer has been installed according to instructions,
it is ready to be operated. The system is fully automatic
and does not require any auxiliary controls. It is designed
to run continuously.
To start the dryer:
Do not start dryer with compressed air flow through the
dryer. Close dryer isolation valves until start-up procedure
is complete.
1. Supply power to the dryer and disengage Emergency
Stop button. The Power On LED will light indicating
power to the controller. The crankcase heater warmup
will begin (the display will show the number of minutes
remaining in the warmup period). This warmup period
is essential to allow the compressor oil to warm and
boil off liquid refrigerant, preventing compressor fail-
ure. The warmup will be skipped only if the dryer was
started previously and supply power has been off for
less than 60 minutes.
The Dryer On LED will blink if the START button is
pressed before the end of the warm-up period.
2. During the warm-up period, review the INSTALLATION
instructions to make sure the dryer has been properly
installed.
3. If the dryer is water-cooled, open water supply lines.
4. After the warm-up period, push the START button. The
Start button energizes the controller for normal opera-
tion.
NOTE