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9
COMPRESSOR RELAY (K4) – This onboard relay controls
the compressor according to the mode and dew point
conditions.
HIGH DEW POINT RELAY (K5) – This onboard relay and
LED alarm turns on when the dew point is 15º F above the
set point. This is also active during any error conditions.
COMPRESSOR UNLOADER #1 RELAY (CU 1) (FU Panel
ONLY) – This onboard relay turns on when the dew point is
below the setpoint +2ºF and turns off when the dew point is
above the setpoint +2ºF.
COMPRESSOR UNLOADER #2 RELAY (CU 2) (FU Panel
ONLY) – This onboard relay turns on when the dew point is
below the setpoint +4ºF and turns off when the dew point is
above the setpoint +4ºF.
DEW POINT SENSOR (Probe 1) – Resistive NTC sensor for
measuring dew point temperature.
SUCTION TEMPERATURE SENSOR (Probe 2) – Resistive
NTC sensor for measuring external suction temperature at
the expansion bulb (E3 Probe).
5a. START UP FOR MODELS SC/CT 40 - 250
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.
•
On models SC/CT 40 to 100 proceed.
•
On models SC/CT 130 to 165 leave power on for 8
hours before proceeding to step 5
•
On models SC/CT 220 to 250 leave power on for 8
hours before proceeding.
2)
On water cooled units make sure there is proper water
pressure and temperature supplied to the water
condenser. (Min 25 psi and max 85º F water tempera-
ture)
3)
On models SC/CT 220 to 250 - Remove lid from dryer.
4)
On models SC/CT 220 to 250 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 counterclock-
wise until it stops. Occasionally it may be necessary
Airtek
4087 Walden Avenue, Lancaster, NY 14086 TEL: (716) 685-4040 FAX: (716) 685-1010 E-MAIL: airtek@airtek.com
to retighten the packing nut (clockwise) if a leak is
observed. The valve will now be fully open.
* Replace cap.
5)
Turn dryer on at the control panel by pushing one of the
mode selection buttons. (SC/CT 220 to 250 should be
turned on immediately after TAGGED valves are
opened.) If storage conditions were adverse, the
refrigerant compressor may make a loud metallic
hammering noise. If this happens, turn the dryer off at
the control panel, wait half a minute and turn it on
again. repeat this until the refrigerant compressor
runs smoothly. The digital dew point display should
start dropping to 35ºF.
6)
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.
7)
Check automatic drain for proper operation. Drain
should open at regular intervals based on the drain
control settings or water level. Clean Y-strainer after
the first 8 hours of operation. (If unit has float, demand
drains there are no Y-strainers.)
8)
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 appli-
cable)
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.
WEB SITE: www.airtek.com
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