11
APM-001e
AUG 2015
DIGITAL READOUT FLASHING 5555
PURGER SHUT-OFF REMOTELY.
This code indicates
that the optional interlock remote relay contacts are open.
These contacts are connected to the purger via the power/
interlock plug-in connector terminals 11 and 12.
REASON 1:
The purger is temporarily shut-off due to the
interlocked compressor (or other device) being shut down
by temperature controls or safety devices.
Check:
Wait until the interlocked compressor (or other
device) begins to operate. If digital readout does not stop
flashing diagnostic code 5555, then check the interlock
relay for proper operation.
DIGITAL READOUT FLASHING 6666
LEVEL CONTROL OUT OF RANGE.
This Flashing 6666
code will alternate with either a 6661, 6662, or 6663 code.
The second code indicates which level sensor is out of the
normal sensing range. This may indicate a mechanical or
electrical problem with the drainer level sensor (6661), the
low side level sensor (6662), or the high side level sensor
(6663).
REASON 1:
One or more level sensors are out of calibration.
Action:
Recalibrate the level sensors as follows:
A) First, all refrigerant and oil must be removed from
the APM and the pressure must be zero (atmospheric
pressure)
B) Remove power to purger.
C) install the supplied “jumper” (small white chip) to
the Reset Pins located on the side of the Control
Board, wait 5 minutes. See figure 4. Note: A small
alligator clip can be substituted for “jumper”.
D) Apply power to the APM. The display on the front
of the APM should read “CAL”. With power still
applied, remove “jumper” from the Reset Pins.
E) Recalibration is complete.
REASON 2:
Discontinuity in the coaxial wire from the
probe to the control board.
Check:
Verify that the level sensor coaxial connectors at
the control board are tight.
Action:
If the connections appear proper, replace the
suspected level sensor, with the purger isolated from
the system and pressure at zero. See also the Caution
section on page 14.
DIGITAL READOUT FLASHING 7777
LOSS OF HIGH PRESSURE LIQUID.
If the liquid line
solenoid valve remains energized for more than 30 minutes, it
indicates there is insufficient high-pressure liquid available
to maintain an adequate level in the flooded evaporator
of the purger. The purger will not purge air until this is
corrected.
REASON 1:
Liquid line solenoid valve (B) is not opening
or the removable seat/orifice is blocked.
Check:
Make sure the liquid line solenoid valve (B) is
energized. If not, check for voltage at the solenoid
coil.
Action:
Replace the coil if it is burned-out, otherwise clean
or replace the removable seat/orifice inside the solenoid
valve body. See also the Caution section on page 14.
REASON 2:
Liquid line restricted.
Check:
Look for closed shut-off valves in the liquid line,
plugged strainers, or the plastic shipping cap still in the
liquid line flange.
Action:
Inspect piping for a closed shut-off valve. Open
the shut-off valves, clean the strainer, or remove the
shipping cap. See also the Caution section on page 14.
REASON 3:
Flooded evaporator is full of oil.
Check:
Look for oil at the drain valves.
Action:
Drain the oil according to safe refrigeration
practices.
PURGER NOT OPERATING AND THE DIGITAL
READOUT BLANK
REASON 1:
One or both of the replaceable 3 amp fuses is
blown. (APM’s shipped before January 1997 have circuit
breakers instead of fuses.)
Check:
Check for a blown fuse.
Action:
Replace the blown fuse.
REASON 2:
Condensation inside the flexible electric
conduit is causing a short in the DIN plug connector.
Note: This only applies to APM purgers shipped before
December 9, 1996.
Check:
Remove the DIN plug connector from the solenoid
valve and inspect for moisture or condensation.
Action:
Replace the solenoid, flexible conduit, and (if
necessary) the power board. Contact the factory for
an upgrade kit including the solenoid and flexible
conduit. The power board must be ordered separately.
Refer to drawing 2001-80 for power board replacement
procedures.
REASON 3:
A short or open on the low voltage side of
the power board.
Check:
With power to the APM use a voltmeter to check
for approximately 10V DC across terminals 27 and 30.
Action:
If there is no voltage across the terminals, replace
the power board. Refer to drawing 2001-80 for power
board replacement procedures.
REASON 4:
One or both solid state fuses (F6A and F6B)
are blown.
Action:
Disconnect power and verify continuity across the
fuses. Replace board if no continuity.
SECTION 4 TROUBLE SHOOTING PURGER OPERATION
