Table 4: R-513A pressure to saturated temperature conversion
Pressure
psig (bar)
Temp. avg.
°F (°C)
Pressure
psig (bar)
Temp. avg.
°F (°C)
Pressure
psig (bar)
Temp. avg.
°F (°C)
Pressure
psig (bar)
Temp. avg.
°F (°C)
0.0 (0.0) -20.5 (-29.1) 130 (8.96) 99.3 (37.4) 260 (17.93) 146.7 (63.8) 390 (26.89) 179.1 (81.7)
5.0 (0.34) -8.4 (-22.4) 135 (9.31) 101.6 (38.7) 265 (18.27) 148.1 (64.5) 395 (27.23) 180.2 (82.3)
10.0 (0.69) 1.4 (-17.0) 140 (9.65) 103.9 (39.9) 270 (18.62) 149.6 (65.3) 400 (27.58) 181.2 (82.9)
15.0 (1.03) 9.8 (-12.3) 145 (10.0) 106.1 (41.2) 275 (18.96) 151.0 (66.1) 405 (27.92) 182.3 (83.5)
20.0 (1.38) 17.2 (-8.2) 150 (10.34) 108.3 (42.4) 280 (19.31) 152.4 (66.9) 410 (28.27) 183.3 (84.1)
25.0 (1.72) 23.8 (-4.5) 155 (10.69) 110.4 (43.5) 285 (19.65) 153.7 (67.6) 415 (28.61) 184.3 (84.6)
30.0 (2.07) 29.8 (-1.2) 160 (11.03) 112.4 (44.7) 290 (19.99) 155.1 (68.4) 420 (28.96) 185.4 (85.2)
35.0 (2.41) 35.3 (1.8) 165 (11.38) 114.5 (45.8) 295 (20.34) 156.4 (69.1) 425 (29.30) 186.4 (85.8)
40.0 (2.76) 40.4 (4.6) 170 (11.72) 116.4 (46.9) 300 (20.68) 157.7 (69.8) 430 (29.65) 187.4 (86.3)
45.0 (3.10) 45.1 (7.3) 175 (12.07) 118.4 (48.0) 305 (21.03) 159.0 (70.6) 435 (29.99) 188.4 (86.9)
50.0 (3.45) 49.5 (9.7) 180 (12.41) 120.3 (49.1) 310 (21.37) 160.3 (71.3) 440 (30.34) 189.4 (87.4)
55.0 (3.79) 53.7 (12.1) 185 (12.76) 122.2 (50.1) 315 (21.72) 161.6 (72.0) 445 (30.68) 190.3 (87.4)
60.0 (4.14) 57.7 (14.2) 190 (13.10) 124.0 (51.1) 320 (22.06) 162.9 (72.7) 450 (31.03) 191.3 (88.5)
65.0 (4.48) 61.5 (16.4) 195 (13.44) 125.8 (52.1) 325 (22.41) 164.1 (73.4) 455 (31.37) 192.2 (89.0)
70.0 (4.83) 65.1 (18.4) 200 (13.79) 127.6 (53.1) 330 (22.75) 165.3 (74.1) 460 (31.72) 193.2 (89.6)
75.0 (5.17) 68.5 (20.3) 205 (14.13) 129.3 (54.1) 335 (23.10) 166.6 (74.8) 465 (32.06) 194.1 (90.1)
80.0 (5.52) 71.9 (21.2) 210 (14.48) 131.0 (55.0) 340 (23.44) 167.8 (75.4) 470 (32.41) 195.1 (90.6)
85.0 (5.86) 75.0 (23.9) 215 (14.82) 132.7 (55.9) 345 (23.79) 168.9 (76.1) 475 (32.75) 196.0 (91.1)
90.0 (6.21) 78.1 (25.6) 220 (15.17) 134.3 (56.8) 350 (24.13) 170.1 (76.7) 480 (33.09) 196.9 (91.6)
95.0 (6.55) 81.0 (27.2) 225 (15.51) 136.0 (57.8) 355 (24.48) 171.3 (77.4) 485 (33.44) 197.8 (92.1)
100.0 (6.89) 83.9 (28.8) 230 (15.86) 137.6 (58.7) 360 (24.82) 172.4 (78.0) 490 (33.78) 198.7 (92.6)
105.0 (7.24) 86.6 (30.3) 235 (16.20) 139.1 (59.5) 365 (25.17) 173.6 (78.7) 495 (34.13) 199.6 (93.1)
110.0 (7.58) 89.3 (31.8) 240 (16.55) 140.7 (60.4) 370 (25.51) 174.7 (79.3) 500 (34.47) 200.4 (93.6)
115.0 (7.93) 91.9 (33.3) 245 (16.89) 142.2 (61.2) 375 (25.86) 175.8 (79.9) 505 (34.82) 201.3 (94.1))
120.0 (8.27) 94.4 (34.7) 250 (17.24) 143.7 (62.1) 380 (26.20) 176.9 (80.5)
125.0 (8.62) 96.9 (36.5) 255 (17.58) 145.2 (62.9) 385 (26.54) 178.0 (81.1)
Checking and trimming the refrigerant charge
It is important that the amount of chiller refrigerant charge is verified to meet the specified amount
as found in the chiller factory order form (FOF). Reference this document or the unit sales order
screen on the chiller control panel to determine the amount charge required based on the chiller
rating.
During operation, the refrigerant charge level is correct when the Evaporator Approach (STD),
Condenser Approach (STD), Sub-Cooling, and Compressor Discharge Superheat are at the design
values for the condition. For new sales after 2016, these design values are included as part of the
FOF. For older units where they are not seen on the FOF, they would be provided upon request
from the chillers sales engineer from the chiller rating program. These depend on tube selection,
chilled fluid type, operating head, and operating condition. The following equations define these
parameters. Condenser level/Sub-cooling is detected by the liquid level sensor and controlled to
the programmed set-point by the chiller control logic.
Equations:
• Evaporator approach = (LCHLT) - (EST)
• Discharge superheat = (CDT) - (CST)
Definitions (based on OptiView panel operation data):
• EST = Evaporator saturation temperature
• LCHLT = Leaving evaporator liquid temperature
Model YK (Style H), R-134a and R-513A38
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