SUB-COOL
The Sub-cool position on the rocker switch, located on the front of the O Z s a v e r u n i t
allows the operator to Sub-cool the storage tank when the OZsaver
unit is connected
per the standard method or when using a service manifold.
While in the Recovery Mode, move the rocker switch to Sub-cool and the OZsaver™
LjkL
unit will stop recovering refrigerant from the system being serviced and Sub-cool the
storage tank. This is done without having to disconnect and reconnect hoses.
When the rocker switch is in the Recover position the OZsaver
™JiyU,
unit returns to the
normal recovery mode.
k
The advantages of the Sub-cool is that it allows the operator to reduce the pressure in the
storage container. This enhances the recovery rates for both liquid and vapor. It also
allows the O Zsaver™ ^ unit to pull exceptionally low vacuums on the systems being
serviced (15 to 20 inches of Hg or better).
Sub-cooling should be done for approximately 5 to 10 minutes or until the operator feels
that the pressure in the storage tank has been sufficiently reduced.
While the rocker switch is set to Sub-cool the suction pressure gage is reading the
pressure in the storage container. The longer the OZsaver
h fi
unit is Sub-cooling, the
more the pressure will drop. A pressure drop of 20 psig. on the gage, from the time the
Sub-cool process was begun, will result in a significant increase in the recovery rate.
PURGING NON-CONDENSABLES (AIR)
While in the Recovery mode, use the following procedure to purge the unit of air:
1. CLOSE the Inlet, Discharge and Tank Return valves.
2. MOVE the rocker switch to Self Evacuate and follow the instructions for the Self
Evacuation operation described on page 10 in this manual.
NOTE: If deeper vacuums are required, a vacuum pump can be attached to the Self
Evacuate Discharge valve during this process.
SWITCHING FROM ONE
REFRIGERANT TO ANOTHER
Whenever the O Z s a v e r u n i t is used on two different refrigerants, the Self
Evacuation operation should be used prior to switching to the new refrigerant. The unit
should then be run on air in both the Recover and Sub-cool modes for 30 seconds each to
purge any residual refrigerant. A final Self Evacuation operation should then be
performed to remove the air from the OZsaver
L
unit.
11
2436AI I-
