WARNING
To avoid liquid freezing in the chiller tubes when removing refrigerant from a charged system, run the
chilled water pumps. Maintain chilled liquid flow for the entire refrigerant recovery process. If water
flow cannot be maintained, completely drain the chilled liquid from the chiller and the waterbox vents.
Open all drains before beginning this process.
When removing refrigerant charge use an empty fully evacuated refrigerant container. This
ensures that the container is not contaminated and aids in the efficient removal of refrigerant.
Before removing any refrigerant, establish the starting weight (tare weight) for the refrigerant
cylinder and log the final weight for each container that is used for the recovery. This ensures that
the correct weights are noted for determining the chiller refrigerant charge amount.
Use the following equation:
Refrigerant weight = Total Container Weight – Tare Weight
While removing or adding refrigerant, take every precaution to prevent air from entering the
system when handling the charging lines. Create a suitable charging connection from new copper
tubing or correctly selected flexible charging hoses. Fit this charging connection between the
system service or charging valves and the fitting on the refrigerant container. This connection must
be as short as possible but long enough to provide sufficient flexibility for changing containers. It
must also contain a tee fitting with a valve that can serve as a connection point to a vacuum pump
to evacuate the charging lines.
Evacuate the charging connection each time the lines are disconnected for changing cylinders
or any of the components of the charging process. The charging line for the refrigerant liquid
must also contain a sight glass. When liquid refrigerant is being handled, the sight glass can be
monitored to determine when the liquid is no longer being transferred to or from the chiller.
1. Navigate to Condenser/Drain Control screen and manually.
2. Set the drain valve to 100% open, to ensure that the condensed liquid drains to the
evaporator.
3. Connect the liquid refrigerant charging connection on the bottom of the evaporator to the
refrigerant container liquid connection.
4. To help move the liquid refrigerant, use a push and pull method to lower the pressure in the
recovery container and raise the chiller system vapor pressure.
Note: This method draws vapor suction from the recovery container vapor connection
and discharges into the condenser vapor connections, allowing all liquid refrigerant to
be pushed to the recovery container.
5. Repeat the previous steps after the evaporator liquid has been removed by connecting a
liquid recovery connection to the compressor discharge line at the low point service valves.
Note: The compressor discharge line is the lowest point in the refrigerant circuit and
might contain condensed liquid refrigerant. Conducting liquid recovery at this location
can speed up the recovery process.
YVAM with OptiView Control Center152
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