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SECTION 5 SERVICE, TROUBLESHOOTING, & PARTS
TOUCHSCREEN DISPLAYS 2222
LOSS OF FOUL GAS PRESSURE. This usually means the
pressure in the air separator chamber is below 80 psig
(5.5 barg). The high side pressure gauge on the purger
reads near suction pressure. The purger will not allow
noncondensible gases to be released from the purger.
REASON 1: A remote purge point solenoid valve is
jammed closed.
Check: Advance purge points one at a time with the purge
point advance button, waiting approximately 2 minutes
before advancing again. Wait until the Touchscreen again
displays 2222. The faulty coil or wiring is now pinpointed.
Inspect the remote purge point solenoid valve which
caused the diagnostic code to appear. Manually open the
solenoid valve and recheck the pressure.
Action: If the coil is energized, clean and replace any
solenoid valve parts as necessary. See also the Caution
section on page 28.
REASON 2: Foul gas line restricted.
Check: Inspect the Foul gas line for a closed shut-off
valve(s) or the plastic shipping cap still in foul gas line
flange.
Action: Open shut-off valves and/or remove the shipping
cap. See also Caution section, page 28.
REASON 3: Faulty pressure transducer.
Check: With the purger in any operational mode, check
the high-side pressure gauge reading. If it is above 80
psig, press the STATUS functional pushbutton several
times until the pressures are displayed. Verify that the
high side pressure is greater than 80 psig (5.5 barg).
Action: If the high side pressure displayed is less than 80
psig (5.5 barg), replace the high side pressure transducer
(p/n PT1) with the purger at zero pressure. See also the
Caution section on page 28.
TOUCHSCREEN DISPLAYS 3333
PURGER TOO WARM. If the purger evaporator
temperature is 40°F (4°C) or warmer, the purger will not
release noncondensible gas from the purger because
excessive refrigerant would also escape. This code is also
displayed during initial start-up until the purger flooded
evaporator is cooled down.
REASON 1: Suction temperature too high.
Check: Verify the pressure at the purger suction line
connection. To allow for temperature transfer losses
between the purger evaporator and the temperature
sensor, the suction temperature should be approximately
20°F (–7°C) or colder. For higher suction temperatures,
consult the factory.
Action: Connect to a lower-temperature suction.
REASON 2: Restriction in the suction line.
Check: Inspect the suction line and shut-off valves. These
should be a minimum size of ¾”. On new installations,
also make sure the plastic shipping cap in suction line
flange is removed.
Action: Eliminate the restriction. See also the Caution
section on page 28.
REASON 3: The flooded evaporator inside the purger is
not filled with refrigerant.
Check: Look for a closed liquid line shut-off valve, Also,
check that the liquid line solenoid valve (B) is energized.
Action: Open the liquid line shut-off valve. If not energized,
check for voltage at the liquid line solenoid valve coil.
Replace the coil if it is burned-out.
REASON 4: Faulty liquid make-up level sensor providing
a “false wet” indication.
Check: Remove the cover of the electrical enclosure on
the liquid make-up level sensor. The red LED inside will
be on if it senses liquid, and off if it senses gas. If the
sensor has no frost where the sensor enters the vessel,
but the red LED is on, the sensor may be defective.
Action: Replace the liquid make-up level sensor if defective.
See also Caution section, page 28.
REASON 5: Faulty temperature sensor.
Check: Press the STATUS button to display the evaporator
shell temperature.
Action: Replace the evaporator shell temperature sensor
(p/n 20-2431) if defective.
REASON 6: Purger is in CONCENTRATING WATER mode.
Check: Display Window states CONCENTRATING WATER.
Action: No action is required. It is normal for the evaporator
to heat to warmer than 40°F (4°C) in this mode.
TOUCHSCREEN DISPLAYS 4444
PURGED OVER 60 MINUTE TIME LIMIT. If noncondensibles
are released from the purger for 60 minutes continuously, a
time delay will close the purge gas solenoid valve (C). This
limits the possibility of a substantial amount of refrigerant
inadvertently being released into the water bubbler in the
unlikely event of purger malfunction.
REASON 1: A large volume of noncondensibles is
continuously being removed from system.
Action: Reset the time delay by pressing the RESET
4444 functional pushbutton on the Touchscreen. See
Figure 6. The delay is now reset for up to another hour of
continuous purging. Otherwise, change the AIR PURGE
LIMIT to STARTUP for continuous purging without the 60
minute time limit.
REASON 2: Purge gas solenoid valve (C) is not opening
or the seat/orifice is blocked.
Check: Make sure purge gas solenoid valve (C) is energized.
If not, check for voltage at solenoid coil.
Action: Replace the coil if it is burned-out, otherwise
clean or replace the valve. See also the Caution section
on page 28.
REASON 3: The shut-off valve located after the purge
gas solenoid valve (C) is closed.
Check: Verify that purge gas is not being sent to the
bubbler.
Action: Open the valve.
BATTERY REPLACEMENT
Figure 8
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