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TRUE RESIDENTIAL
®
DO NOT CUT OFF PROCESS TUBE ENDS -
Using piercing type service valves, attach one of these to each of the
suction and liquid line process tubes (as close to the end of the tube as possible).
MA K E SURE THE G AUGES YOU A RE USING A RE CA LIBR ATED AND CORRECTLY INSTA LLED.
After connecting your gauges - make sure you confirm the compressor is running when doing the next diagnostic
checks.
TROUBLESHOOTING THE REFRIGER ATION SYS TEM
If your system has a high suction pressure and low discharge pressure and the compressor is drawing low amps
its very likely you have a compressor with bad valves. If this is the case, replace the compressor.
BAD COMPRESSOR VALVES
DETERMINE LE AK OR RES TRIC TION
If your system has a low suction pressure and low discharge pressure, first look to see if there are no visible kinks
in the system tubing, then recover the refrigerant and weigh in the correct charge.
If your evaporator coil temperature drops and the system starts to operate correctly this is a sign that your
system has a refrigerant leak. This means that the refrigerant leak must be located and repaired. A technician
can raise system pressure up 200 psi with nitrogen to aid in the leak search.
If the head pressure rises but falls right back down after you stop adding gas and the suction pressure stays
low there may be a restriction in the system. Recover the charge and cut out the drier. Also cut about 2” off of
the capillary tube. Circulate nitrogen through the system to clear any restrictions in the evaporator. Evacuate
the system and recharge. If the problem still exists, capillary tube may need to be replaced.
*E ACH TIME A SYSTEM IS TAPPED INTO, IT IS V ERY IMPORTANT THAT THE DRIER IS REPL ACED AND
A MINIMUM 50 0 MICRON VACUUM IS PULLED THROUGH BOTH HIGH AND LOW SIDE ACCESS FIT TINGS.
A F TER THE SYSTEM IS RECHA RGED BOTH ACCESS FIT TINGS MUST BE REMOVED.
A.
B.
