104
REFRIGERATION TROUBLESHOOTING CHART
Refrigerator ...continued
If the pre s s u res rose and the cabinet began to function corre c t l y, the cabinet was low on charge. T h i s
means that there is a leak in the refrigeration system that must be located. A technician can raise system
p re s s u re up to 200 psi with nitrogen to aid in the leak search. (Remember that the foam insulation with-
in the cabinet will make a leak detector s n i ff e r type re a c t . )
AFTER LEAK IS LOCATED IT IS VERY IMPORTANT THAT THE SYSTEM DRIER IS
CHANGED AND THAT A 200 MICRON VACUUM IS PULLED THROUGH BOTH THE HIGH
AND LOW SIDE ACCESS FITTINGS.
When leak is found recover refrigerant, at this time the technician may want to remove piercing valves and
solder on access valves to pull vacuum and recharge system. (After charging system both service valves
should removed from the system.)
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 1" 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.
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