12 SRUB-IOM001-EN
Refrigerant Charging
and Evacuation
Caution
Refrigerant “R22” only.
Always evacuate air from the tubing before adding
refrigerant.
Add refrigerant through the charging port of liquid line valve
after the completion of evacuation.
The refrigerant provided by the manufacturer meets all the
requirement of our units. When using recycled or
reprocessed refrigerant, it is advisable to ensure its quality
is equivalent to that of a new refrigerant. For this, it is
necessary to have a precise analysis made by a
specialized laboratory. If this condition is not respected, the
manufacturer’s warranty could be cancelled.
Gaseous Charging
This procedure is accomplished with the unit operating.
Electrical connections must be complete. Do not proceed until
the system is ready to operate.
Procedure
1. Open liquid valve that refrigerant go through system and
open suction valve.
2. Turn on power to the unit. Allow the system to run for five to
ten minutes to stabilize operating conditions.
3. Measure airflow across the evaporator coil. Compare the
measurements with the fan performance data in the Data/
Submittal or Service Facts. Once proper airflow is
established, observe the suction and head pressure gauges
on the gauge manifold. Pressure reading should fall
approximately at the points shown by the pressure curves
in Service Facts. Add or remove refrigerant (gas only) as
required to obtain correct head and suction pressure. Check
suction line superheat and condenser sub-cooling to
ensure the unit is operating properly.
4. Disconnect all power to the unit.
5. Remove the charging system from the unit and close the
opening in the bottom of the control box with the pivotal
cover before attempting to replace access panel.
6. Replace all the panels.
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