Start Up For Models Sc/Ct 330 And Up - AirTek SC Series Operator's Manual

5a. START UP FOR MODELS SC/CT 330 and UP.
NOTE: Please read and understand the entire operation and
maintenance manual prior to starting the dryer. This is a brief
start up procedure for those familiar with dryer operation.
CAUTION: There should be no air flow through the dryer
before or during start up. It is recommended that the dryer be
installed with bypass piping to better service the unit.
DRYER START UP PROCEDURE:
1) Make main electrical connection to dryer and apply
power. Refer to dryer name plate or manual to determine
correct voltage. Leave power on unit for 8 hours before
proceeding.
2) On water cooled units make sure there is proper water
pressure and temperature supplied to the water con-
denser. (Min 25 psi and max 85º F water temperature)
3) Remove front cover, if necessary, to expose refrigeration
service valves.
4) Dryers are shipped with TAGGED refrigeration service
valves closed. TAGGED service valves must not be
opened until main power is permanently applied.
However, ONLY TAGGED service valves must be opened
prior to start up.
* Locate TAGGED service valves.
* Remove protective cap from valve stem. (see figure
below)
* Using a refrigeration service wrench or small crescent
wrench, turn the valve stem counterclockwise until it
stops. Occasionally it may be necessary to retighten
the packing nut (clockwise) if a leak is observed. The
valve will now be fully open.
* Replace cap.
* In case of refrigeration ball valves, you must turn 90
degrees to open as stated on valve. (See figure below).
5) On models SC/CT 1500 and up, locate the compressor
service toggle switch. This service switch must be
turned on immediately after valves are opened.
* On Models SC/CT 1500 and up, the refrigeration
compressor may run briefly and then stop. This
process is called pump down. If storage conditions
were adverse, the compressor may make a loud
metallic hammering noise. If this happens, turn the
service switch off and wait half a minute, then back on.
Repeat this step until the compressor runs smoothly,
then stops. Leave the service switch in the ON
position.
6) The dryer is now ready to run. Turn the dryer on at the
control panel (load/No Load Mode).
The digital display should start dropping to 35ºF.
7) With the dryer turned ON from the control panel and
cycling several times, you may now introduce com-
pressed air to the dryer. Open the inlet and outlet
ISOLATION VALVES. Close the BYPASS VALVE.
Airtek 4087 Walden Avenue, Lancaster, NY 14086 TEL: (716) 685-4040 FAX: (716) 685-1010 E-MAIL: airtek@airtek.com
8) Check automatic drain for proper operation. Drain
should open at regular intervals based on the drain
control settings. Clean Y-strainer after the first 8 hours
of operation.
9) Restart dryer using this procedure after maintenance,
power failure or after prolonged shutdown periods.
CAUTION: Failure to follow the above steps in the order shown
MAY result in damage to equipment NOT covered under
warranty.
Operating Instructions:
Always:
* Turn dryer ON and OFF with control panel button. Keep
power to unit during off cycles.
* Start dryer and allow it to cycle several times prior to
allowing air flow through the dryer.
* Clean condenser when dirty.
* Keep ambient temperature under 100º F.
* Keep inlet temperature under 100º F.
* Keep inlet pressure within design limits.
* Check and clean Y-strainer periodically. (if applicable)
Never:
* Turn off main power disconnect except when servicing.
* Allow air to flow through the dryer when it is not running.
* Cycle dryer with air compressor.
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