JOHNSON CONTROLS
13
FORM 50.40-OM1 (713)
ISSUE DATE: 07/17/2013
2
SECTION 2 - OPERATION
GENERAL
The function of a Refrigerant Recovery/Recyling Unit
(RSR) is to remove and store refrigerant from any
machine using the refrigeration cycle and CFC or
HCFC refrigerants. The refrigerants must be removed
from the refrigerant circuit before opening any part of
the unit for maintenance or repairs. Federal law prohib-
its the venting of refrigerant to the atmosphere.
The RSR is con nected to the refrigeration unit by means
of hoses supplied with the RSR. The RSR compressor
develops a pressure differential between the RSR and
the refrigeration unit so that liquid refrigerant is forced
into a storage vessel used in conjunction with the RSR.
The RSR is equipped with a water cooled condenser
that is used to condense the refrigerant vapor remain-
ing in the refrigeration unit after the liquid refrigerant
has been removed. For this duty, the RSR compressor
pumps the remaining vapor through the condenser and
the resulting liquid refrigerant flows into the storage
vessel.
After the refrigeration unit has been repaired, the pro-
cess is reversed so that refrigerant is pumped back into
the refrigeration unit.
PRIOR TO STARTING REFRIGERANT
RECOVERY
Set Pressure Safety Control
A high/low pressure safety control is wired in the mo-
tor control circuit. The pressure settings are adjustable
to con form to the design working pressure of the RSR
storage ves sel and the upper limit for satisfactory
TABLE 5 - SETTINGS FOR PRESSURE SAFETY CONTROL SWITCHES
REFRIGERANT
CUT OUT CUT IN
HIGH PRESSURE LOW PRESSURE HIGH PRESSURE LOW PRESSURE
PSIG KPA IN HG KPA PSIG
IN HG KPA
CFC-12/HFC-134a 150 1034 20 68 Manual Reset 10 34
CFC-500 180 1241 20 68 Manual Reset 10 34
CFC-502 250 1724 20 68 Manual Reset 10 34
HCFC-22 250 1724 20 68 Manual Reset 10 34
CFC-11/HFC-123 10 69 29 98 Manual Reset 20 68
CFC-114 30 207 29 98 Manual Reset 20 68
performance of the RSR condenser and compressor for
the refrigerant being recovered.
Prior to starting the RSR unit, the pres-
sure control must be set to the high and
low pressure values shown in Table 5 on
page 13.
Check Oil Level
RSR Compressor (High Pressure Units)
The oil level should be checked in the sight glass lo-
cated in the RSR compressor crankcase.
A shortage of oil will result in the failure
of the RSR compressor.
The oil level should be 1/2 to 3/4 from the bottom of
the sight glass when the RSR compressor is not run-
ning.
All units, Except where Refrigerant 134a is used, come
factory charged with YORK Type “C” oil. Only this
type of oil should be used when adding oil with the ex-
ception where R-134a is used in the refrigeration unit.
The Ester based oil is used in conjunction with R-134a.
Consult the manufacturer’s recommendations for oil to
be used in the RSR compressor if R-134a is used in the
refrig eration system.
It is recommended that an RSR unit be dedicated for
use in recovering only R-134a. Otherwise the oil in
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