Test for the absence of ammonia using a phenolphthalein test strip.8.
Mount the unit upper panel.9.
WARNING! DO NOT START THE APPLIANCE WITHOUT THE SAFETY VALVE.
4 NONCONDENSABLE OR NONABSORBABLE GASES
Indirect control of the presence of non-condensable or non-absorbable gas in the
hermetic circuit or internal corrosion phenomena
The presence of corrosion phenomena inside the hermetic circuit has immediate effect
that cause machine anomalies that can be easily recognised:
development of a large amount of non-condensable and non-absorbable gas, pro-1.
duced of the corrosion reaction, which causes an accumulation of these gases in
the generator and, consequently, immediate overheating of the generator. This is
caused by the interruption of the water-ammonia solution evaporation process.
production of rust which, detaching from the internal walls of the hermetic circuit, 2.
rapidly blocks the circulation of refrigerant fluid, thus blocking the orifices of the
restrictors. This situation leads to a lack of water-ammonia solution to be evapo-
rated in the generator and causes the same over-heating phenomenon.
In both cases, the over-heating of the generator makes the manual-rearm safety thermo-
stat intervene, which is installed on the wall of the generator.
As a consequence, if there are no generator thermostat interventions, all corrosion phe-
nomena can be excluded and no inspection or additional action is necessary.
The possibility that internal corrosion phenomena are in progress must be taken into
consideration only when a series of five (5) thermostat interventions are detected. In this
case, contact the Technical Assistance.
