Refrigerant Charging; Checking The Refrigerant Charge - York MaxE YK Operating And Maintenance

Maintenance
To avoid the possibility of freezing liquid within the
evaporator tubes when charging an evacuated sys tem,
only re frig er ant vapor from the top of the drum or cyl-
inder must be admitted to the system pressure until the
system pressure is raised above the point cor re spond ing
to the freez ing point of the evaporator liq uid. For wa ter,
the pres sure cor re spond ing to the freez ing point is 8.54
PSIG (58.9 kPa) for R-134a (at sea level).
While charging, every precaution must be tak en to pre vent
moisture laden air from entering the sys tem. Make up a
suitable charging con nec tion from new copper tubing to
fi t between the system charg ing valve and the fi tting on
the charg ing drum. This connection should be as short as
possible but long enough to permit suf fi cient fl exibility
for changing drums. The charg ing con nec tion should be
purged each time a full container of refrigerant is con-
nect ed and changing containers should be done as quickly
as possible to minimize the loss of re frig er ant.
Refrigerant may be furnished in cylinders con tain ing
either 30, 50, 125 or 1750 lbs. (207, 345, 862, or 12,066
kg) of re frig er ant.

CHECKING THE REFRIGERANT CHARGE

The refrigerant charge is specifi ed for each chill er mod el
(See Table 3). Charge the correct amount of refrigerant
and record the level in the evaporator sight glass.
The refrigerant charge should always be checked and
trimmed when the system is shut down.
The refrigerant charge level must be checked af ter the
pressure and temperature have equalized between the
28

REFRIGERANT CHARGING

TABLE 3 – REFRIGERANT CHARGE
DURING UNIT SHUTDOWN
condenser and evaporator. This would be expected
to be 4 hours or more after the com pres sor and water
pumps are stopped. The level should visible in the sight
glass.
Charge the refrigerant in accordance with the method
shown under the "Refrigerant Charging", above. The
refrigerant lev el should be observed and the level re-
cord ed after initial charg ing.
R-134a
SHELLS COMPRESSOR
A-A P1, P2, P3, P4
B-B P1, P2, P3, P4
C-C P5, P6, P7, Q7
D-D P6, P7, Q7
E-E P8
F-F P8, P9
G-G P8, P9
H-H P8, P9
E-E H5
E-F H5
F-E H5
F-F H5, H6
F-G H5, H6
G-F H3, H5, H6, H7, H8
G-G H3, H5, H6, H7, H8
G-G J1, J2
G-H J1, J2
H-G H3, H5, H6, H7, H8
K-K H9
L-L H9
H-G J1, J2
H-H J1, J2
H-H J3
H-J J1, J2
J-H J1, J2
J-H J3
J-J J1, J2
J-J J3, J4
T-T J1, J2,
T-T J3, J4
T-V J3, J4
V-T J3, J4
V-V J3, J4
W-V J3, J4
X-X J5
FORM 160.73-O2 (605)
LBS. / KG
1,250/568
1,550/704
1,600/727
1,750/794
1,750/794
2,330/1,057
2,050/930
2,700/1,225
1,690/768
1,790/813
1,900/863
2,020/918
2,150/977
2,290/1,040
2,415/1,097
2,415/1,097
2,560/1,163
2,560/1,163
2,560/1,163
3,075/1,395
2,625/1,193
2,825/1,284
2,825/1,284
3,010/1,368
3,310/1,368
3,310/1,368
3,495/1,588
3,495/1,588
3,995/1,815
3,995/1,815
4,290/1,950
3,820/1,736
4,150/1,886
4,460/2,027
5,810/2,635
YORK INTERNATIONAL