16
APP-001b
APR 2007
SECTION 7 TROUBLESHOOTING
CONTROL CONSOLE 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.
However, the purger will continue to operate normally in
all other functions.
REASON 1:
A burned-out purge point solenoid coil.
Check:
Check the 2 or 3 amp fuse for continuity. Replace
if necessar y. Advance purge points one at a time with
the purge point advance button, waiting approximately
2 minutes before advancing again. Wait until the fuse
opens or the Control Console again displays 2222. The
faulty coil or wiring is now pinpointed.
Action:
Replace the coil or repair the wire, and replace
the 2 or 3 amp fuse (p/n 20-1279 or p/n 20-1695).
REASON 2:
A remote purge point solenoid valve is
jammed closed.
Check:
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 19.
REASON 3:
“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 19.
REASON 4:
Faulty pressure transducer.
Check:
With the purger in any operational mode, check
the 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 75-3002) with the purger at zero pressure. See also
the Caution section on page 19.
CONTROL CONSOLE DISPLAYS 3333
P U R G E R T O O WA R M .
I f t h e p u r g e r eva p o r a to r
temperature is 40°F (4.4°C) or warmer, the purger will
not release noncondensible gas from the purger because
excessive refrigerant would also escape. The purger will
continue to operate normally in all other functions. This
code is also displayed during initial star t-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.
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 19.
REASON 3:
The flooded evaporator inside the purger is
not filled with refrigerant.
Check:
Look for a closed liquid line shut-of f 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 temperature sensor.
Action:
Replace the evaporator shell temperature sensor
(p/n 20-2431).
R E ASO N 5:
Purger is in CONCENTR ATING WATER
mode.
C h e c k :
D i s p l a y W i n d ow s t a t e s C O N C E N T R AT I N G
WATER.
Action:
No action is required. It is normal for the evaporator
to heat to warmer than 40°F (4.4°C) in this mode.
