Airtek 4087 Walden Avenue, Lancaster, NY 14086 TEL: (716) 685-4040 FAX: (716) 685-1010 E-MAIL: airtek@airtek.com WEB SITE: www.airtek.com
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F) Refrigerant Restriction - If there should be a restric-
tion in the refrigerant system this could cause a high-
pressure situation. The most common points of
restriction are:
1. Liquid Line Solenoid - If the liquid line solenoid
(SC/CT 40 to 250) was defective or not functioning
electrically this could cause a restriction. When the
Power Saver Active light is off the liquid line
solenoid should be energized and fully open. To
verify this, examine the following.
a) You need to first check the coil of the liquid
line valve to ensure that it is functioning. The
easiest way to verify if the coil is energized is
to take a screwdriver or a piece of metal and
touch it to the screw or post on the top metal
to the screw or post. If the Power Saver Active
light is off and there is no magnetic pull, the
coil is not functioning.
b) If you have determined the coil is not function-
ing there are two things you must check.
- Test the coil electrically for continuity to
ensure it is not shorted. If it is shorted
replace the coil.
- If the coil is not shorted you need to check
the K2 relay marked “Suction”, terminals 7
and 8. There should be an output from
this relay. If there is, replace the board.
c) If the coil is functioning and the restriction
seems to remain the valve may be the
problem.
The internals or the whole valve should be
replaced. Or the restriction could be in the
expansion valve. This is rare but possible.
Remember all of this must be checked while the unit is
operative and in the refrigerating state. The way this is
determined is by the Power Saver Active light being off.
G) Service Valve Closed - When the dryer is fully opera-
tive, all refrigeration service valves with the exception of
the service valve on the bottom of the evaporator on
models SC/CT300’s and up, should be open. If one
should be closed, even partially, this could cause
enough of a restriction to cause high-pressure
problems.
H) Faulty Expansion Valve - This is a very rare situation
however there is means of testing this theory. Test by
applying heat (hair drier) to TXV sensing bulb located
just after the flood level control for about 30-45 sec-
onds. This should cause the unit to flood back and
lower the super heat. To check this, take a temperature
reading on the suction accumulator, it should be
extremely cold, if it is not, your expansion valve is stuck
closed or is dirty. Check to make sure that the capillary
tube from the power head to the sensing bulb is not
severed, this could cause the valve to close. Your
suction accumulator normally shows a level based on
temperature of being 1/3 to 1/2 full. If it is less you may
have a restriction.
I) Disconnected or Faulty Jumper Wire (Very rare) -
There is an orange jumper wire that runs from the
outgoing current on the high-pressure switch to
terminal 19 on the main dew point controller. This
terminal must see power at all times in order for the
unit to function. If the high-pressure switch opens it
severs power to terminal 19 and the unit shuts down
on “E7”. However if the jumper wire is faulty or discon-
nected terminal 19 does not see power and will shut
down on a false “E7”. To check remove power from the
unit and check for continuity through the jumper wire if
there is none inspect and/or replace wire. Reapply
power. If the unit still shows “E7” and the high-pres-
sure switch has checked good, the problem is in the
board.
Diagnostic code “E9”
Drain Shutdown
- If the drain switch remains closed for 30 minutes, the
unit will flash “E9”.
- Drain output will pulse on and off for the first 4 minutes
during “E9”
- Drain solenoid will remain energized during an “E9”
alarm
- Drain alarm is automatically reset when the drain
switch opens.
- Pressing the Drain Test button resets the Drain Alarm.
11. INSTRUCTIONS FOR ORDERING REPAIR PARTS
When ordering parts, specify dryer model and serial
number. (See name plate of the unit).
All orders for parts should be placed with your AIRTEK
dealer. Should you not know the dealer in your area, contact
Airtek at (716) 685-4040
12. REPLACING COALESCER ELEMENTS (CT UNITS ONLY)
ModelCoalescerElement No. ModelCoalescerElement No.
CT 40 JE-C0150 CT 800 JE-C0800
CT 60 JE-C0150 CT 1000 JE-C1000
CT 80 JE-C0150 CT 1200 JE-C1600
CT 100 JE-C0150 CT 1500 JE-C1600
CT 130 JE-C0150 CT 2000 JE-C2000
CT 165 JE-C0150 CT 2500 JE-C3000
CT 220 JE-C0200 CT 3000 JE-C3000
CT 250 JE-C0200 CT 300 JE-C0300
CT 400 JE-C0600 CT 500 JE-C0600
CT 650 JE-C0600
* * Consult Factory for unlisted models or specials.
WARNING: When replacing the element, isolate the dryer
from the plant air system and relieve air pressure BEFORE
ATTEMPTING any maintenance.
Remove cabinet cover, locate filter cover at the top right
corner of the air system. Remove cover bolts, element is
secured with a centering hold down.
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