12
APM-001e
AUG 2015
NONCONDENSIBLES ARE NOT BEING
RELEASED.
(See also page 10; Digital Readout Flashing 3333)
REASON 1: Noncondensibles not present in system.
Check: Compare the refrigerant liquid temperature from
condenser exit with the condensing pressure. The
pressure/temperature relationship should be within 2
or 3 psig (0.14 to 0.21 bar).
Action: None at this time.
REASON 2: Strainer/orifice plugged.
Symptom: The purger appears to be operating properly,
however, the liquid feed line is not frosted.
Check: Look for a restriction in the strainer/orifice.
REASON 3: foul gas line is flooded with liquid.
Symptom: The line from the bottom of the liquid drainer
solenoid valve (A) to the inlet of the purger evaporator
often remains frosted.
Check: Inspect condenser and foul gas piping. In many
cases, the problem is liquid refrigerant being drawn
from the purge point. To prevent this from happening,
select purge point locations above liquid surfaces and
make sure purge point lines are installed so that only
vapor, and not liquid, can be drawn in. Refer to Piping
Instructions in Section I of this bulletin.
Action: Correct condenser and foul gas piping.
REASON 4: High side level sensor not detecting drop in
liquid level due to oil.
Action: Run recalibration procedure per recalibration
instruction on page 11.
AMMONIA INSTEAD OF NONCONDENSIBLES
RELEASED FROM PURGER.
(See also page 10; Digital Readout Flashing 3333)
REASON 1: Purge gas solenoid valve (C) leaking at seat.
Symptom: A slow leak of noncondensibles to the bubbler
when the Purging status light is off.
Check: Look for dirt or a worn seat in the purge gas
solenoid valve (C).
Action: Remove, clean, or replace the seat/orifice and
solenoid tube plunger. See also the Caution section
on page 14.
REASON 2: Oil in purger.
Symptom: No frost around the low side oil drain valve.
Action: Remove oil through both the low side and high
side drain valves (See Figure 1) per safe refrigeration
procedures and suggested oil removal instructions
describe in the Oil Drains section, page 4.
WATER BUBBLER DEVELOPS EXCESSIVE
MINERAL COATING.
REASON 1: Hard water.
Action: Add vinegar to the bubbler water. Then, clean with
the supplied brush. Use a water conditioning housing
and cartridge in the water supply line to the purger.
SECTION 4 TROUBLE SHOOTING PURGER OPERATION
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