SF AllVac Commercial, Установка, эксплуатация и обслуживание, Страница: 18 / 36

RRGA-SVX01A-EN 18
Operation
5. Evacuating Refrigerant Vapor From Recovery Tank and Hoses
(This step removes any liquid or refrigerant vapor in the recovery tank
and connecting hoses.)
a) Energize chiller condenser and evaporator water pumps. Water should be
flowing through both evaporator and condenser during this procedure to
reduce the potential for freezing chiller tubes.
b) AllVac provides for automated evacuation procedures of the recovery sys-
tem and hoses.
The operator reads the instructions provided by the microprocessor controls,
then performs the task described. This sequences each step for closing
valves and evacuating the AllVac and hoses
Important: AllVac’s microprocessor displays instructions on the LCD screen
as recovery operations are implemented. During system recharging, the
references to the A/C System and the Recovery Tank are reversed.
Therefore, during recharging operations, the operator MUST assume that
the A/C System is now the Recovery Tank and the Recovery Tank is the A/C
System.
c) Operate AllVac until tank vapor pressure gauge indicates a vacuum great-
er than 29” Hg for low pressure refrigerants.
Note: If, at any time, chiller pressure gauge indicates a value greater than 10
psig:
1. Compare chiller gauge reading with the saturated pressure shown in a
standard pressure/temperature chart for the type of refrigerant being
transferred. If the chiller pressure exceeds the saturated pressure indi-
cated for the type of refrigerant being transferred for the present chiller
temperature, it is actually an indication of the presence of air in the chiller.
2. If there is air in the chiller, the operator should use the chiller’s purge sys-
tem to remove the air before continuing and/or use RefTec’s portable
Minipurge. The Minipurge is an oil-less compressor driven purge which is
designed to purge non-condensibles from any refrigerant.
Note: If chiller pressure repeatedly rises above 10 psig, this indicates an air
leak in either the recovery tank or connecting hoses. If leakage cannot be
stopped at this time, terminate the operation.
d) Upon completion of the evacuation procedures, follow the instructions
according to the AllVac display to shut down unit.
e) Disconnect all power cables and hoses.