Specifications

YORK INTERNATIONAL 55
FORM 160.48-O1
down keep a careful watch on the wet bulb indicator tem-
perature, and do not let it fall below 35°F. If the tempera-
ture is allowed to fall to 32°F the water in the test tube
will freeze, and the result will be a faulty temperature
reading.
REFRIGERANT CHARGING
CHECKING THE REFRIGERANT CHARGE DURING UNIT SHUT DOWN
HANDLING REFRIGERANT FOR DISMANTLING AND REPAIRS
If it becomes necessary to open any part of the refriger-
ant system for repairs, the following paragraphs outline
the procedure for handling the refrigerant while the sys-
tem is open.
Since Refrigerant-123 boils at 82°F under atmospheric
pressure, it will not be necessary to remove the refrig-
erant if the system it to be open for only a few hours.
Any part of the system which is above the liquid level
will be accessible without disturbing the refrigerant
charge.
If the system must remain open for more than a few
hours the refrigerant should be drained and stored in
clean drums for the duration of the repair period.
If conditions permit, the system pressure should be as
near as possible to atmospheric before opening the sys-
tem and the refrigerant charge should be kept as near as
possible to 82°F to keep either the refrigerant loss or the
air intake to a minimum. After the system has been re-
assembled, the air should be removed by means of the
purge unit. (See “Purging the System”, page 39.)
To avoid the possibility of freezing the liquid within the
cooler tubes when charging an evacuated system, only
refrigerant vapor from the top of the drum or cylinder
must be admitted to the system until the system pres-
sure is raised above the point corresponding to the freez-
ing point of the cooler liquid. For water, the pressure
corresponding to the freezing point is 20.4 in Hg. vacuum
for R-123 (at sea level).
While charging, every precaution must be taken to pre-
vent moisture laden air from entering the system. Make
up a suitable charging connection from new copper tub-
ing 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 suffi-
cient flexibility for changing drums. The charging con-
nection 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 ei-
ther 100, 200 or 650 Ibs. of refrigerant. These drums
are not returnable and they should be stored for future
use if it should ever become necessary to remove re-
frigerant from the system.
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 has 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 “Refrigerant Charging” above. The refrig-
erant level should be observed and the level recorded
after initial charging.
TABLE 4 - REFRIGERANT CHARGE
SHELL CODES
COOLER COMPRESSOR
G0, G1, G3 B 890
G0, G1, G3 C 890
H1, H3 ↓ 970
J1, J3 ↓ 1130
K1, K3 ↓ 1270
G0, G1, G3 E 890
H1, H3 ↓ 970
J1, J3 ↓ 1130
K1, K3 ↓ 1270
L1, L3 ↓ 1390
K4, K6 F 1390
K7, K9 ↓ 1530
L4, L6 ↓ 1590
LBS.