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52 YORK INTERNATIONAL
REFRIGERANT CHARGING
To avoid the possibility if freezing liquid within the
cooler tubes when charging an evacuated sys-
tem, only refrigerant vapor from the top of the
drum or cylinder must be admitted to the system
pressure until the system pressure is raised above
the point corresponding to the freezing point of
the cooler liquid. For water, the pressure corre-
sponding to the freezing point is 57.5 PSIG for R-
22 or 8.54 PSIG for R-134a (at sea level).
While charging, every precaution must be taken
to prevent moisture laden air from entering the
system. Make up a suitable charging connection
from new copper tubing to fit between the system
charging valve and the fitting on the charging drum.
This connection should be as short as possible
but long enough to permit sufficient flexibility for
changing drums. The charging connection should
be purged each time a full container of refrigerant
is connected and changing containers should be
done as quickly as possible to minimize the loss
of refrigerant.
Refrigerant may be furnished in drums containing
either 30, 50, 125 or 1750 lbs. of refrigerant. These
drums are not returnable and they should be
stored for future use if it should ever become nec-
essary to remove refrigeration from the system.
TABLE 4 – REFRIGERANT CHARGE
R-22
SHELL CODES
LBS.
COOLER COND.
M M 1,425
M N 1,600
N M 1,675
N N 1,800
N P 1,800
P N 1,875
P P 1,875
P Q 2,175
Q P 2,225
Q Q 2,500
Q R 2,800
R Q 3,050
R R 3,300
R S 3,500
S R 3,500
S S 3,500
R-134a
SHELL CODES
LBS.
COOLER COND.
L L 1,150
L M 1,150
M L 1,400
M M 1,400
M N 1,585
N M 1,650
N N 1,805
N P 1,805
P N 1,900
P P 1,900
P Q 2,205
Q P 2,235
Q Q 2,515
Q R 2,800
R Q 3,075
R R 3,325
R S 3,450
S R 3,450
S S 3,575
CHECKING THE REFRIGERANT CHARGE
DURING UNIT SHUTDOWN
The refrigerant charge is specified for each chiller model
(see Table 4). Charge the correct amount of refrigerant
and record the level in the cooler sight glass.
The refrigerant charge should always be checked and
trimmed when the system is shut down.
The refrigerant charge level must be checked after the
pressure and temperature have equalized between the
condenser and cooler. This would be expected to be 4
hours or more after the compressor and water pumps
are stopped. The level should be at the center of the
sight glass + 1/4 inch.
Charge the refrigerant in accordance with the method
shown under the “Refrigerant Charging”, above. The
refrigerant level should be observed and the level re-
corded after initial charging.