Table 147: R-1234ze pressure to saturated temperature conversion
Pressure psia (bar) Temperature ºF
(ºC)
Pressure psia (bar) Temperature ºF
(ºC)
Pressure psia (bar) Temperature ºF
(ºC)
44.72 (3.08) 50.0 (10.0) 90.90 (6.27) 91.0 (32.8) 166.25 (11.46) 132.0 (55.6)
45.57 (3.14) 51.0 (10.6) 92.36 (6.37) 92.0 (33.3) 168.54 (11.62) 133.0 (56.1)
46.43 (3.20) 52.0 (11.1) 93.83 (6.47) 93.0 (33.9) 170.84 (11.78) 134.0 (56.7)
47.30 (3.26) 53.0 (11.7) 95.32 (6.57) 94.0 (34.4) 173.17 (11.94) 135.0 (57.2)
48.19 (3.32) 54.0 (12.2) 96.82 (6.68) 95.0 (35.0) 175.53 (12.10) 136.0 (57.8)
49.09 (3.38) 55.0 (12.8) 98.34 (6.78) 96.0 (35.6) 177.91 (12.27) 137.0 (58.3)
50.00 (3.45) 56.0 (13.3) 99.89 (6.89) 97.0 (36.1) 180.31 (12.43) 138.0 (58.9)
50.93 (3.51) 57.0 (13.9) 101.45 (6.99) 98.0 (36.7) 182.74 (12.60) 139.0 (59.4)
51.87 (3.58) 58.0 (14.4) 103.02 (7.10) 99.0 (37.2) 185.19 (12.77) 140.0 (60.0)
52.82 (3.64) 59.0 (15.0) 104.62 (7.21) 100.0 (37.8) 187.66 (12.94) 141.0 (60.6)
53.78 (3.71) 60.0 (15.6) 106.23 (7.32) 101.0 (38.3) 190.16 (13.11) 142.0 (61.1)
54.76 (3.78) 61.0 (16.1) 107.87 (7.44) 102.0 (38.9) 192.69 (13.29) 143.0 (61.7)
55.75 (3.84) 62.0 (16.7) 109.52 (7.55) 103.0 (39.4) 195.24 (13.46) 144.0 (62.2)
56.75 (3.91) 63.0 (17.2) 111.19 (7.67) 104.0 (40.0) 197.81 (13.64) 145.0 (62.8)
57.77 (3.98) 64.0 (17.8) 112.88 (7.78) 105.0 (40.6) 200.42 (13.82) 146.0 (63.3)
58.80 (4.05) 65.0 (18.3) 114.59 (7.90) 106.0 (41.1) 203.04 (14.00) 147.0 (63.9)
59.85 (4.13) 66.0 (18.9) 116.32 (8.02) 107.0 (41.7) 205.70 (14.18) 148.0 (64.4)
60.91 (4.20) 67.0 (19.4) 118.07 (8.14) 108.0 (42.2) 208.37 (14.37) 149.0 (65.0)
61.99 (4.27) 68.0 (20.0) 119.83 (8.26) 109.0 (42.8) 211.08 (14.55) 150.0 (65.6)
63.07 (4.35) 69.0 (20.6) 121.62 (8.39) 110.0 (43.3) 213.81 (14.74) 151.0 (66.1)
64.18 (4.42) 70.0 (21.1) 123.43 (8.51) 111.0 (43.9) 216.57 (14.93) 152.0 (66.7)
Before charging, establish that starting weight for the refrigerant cylinder. When the chiller has
been vapor charged to the appropriate saturation pressure, you might need to use a refrigerant
pump to draw vapor from the chiller and discharge it to the vapor connection of the refrigerant
cylinder. This helps to create a pressure differential for pushing the refrigerant liquid from the
cylinder to the chiller.
While charging, take every precaution to prevent air from entering the system. Create a suitable
charging connection from new copper tubing or correctly selected flexible charging hoses. Fit this
charging connection between the system charging valve and the fitting on the charging drum.
This connection must be as short as possible but long enough to provide sufficient flexibility for
changing drums. It must also contain a tee fitting with a valve that can serve as a connection point
to a vacuum pump to evacuate the charging lines.
The charging connection must be evacuated each time the lines are disconnected for changing
cylinders or any of the components of the charging process.
The charging line must also contain a sight glass. When liquid charging is performed, the sight
glass can be monitored to determine when the liquid is no longer being transferred to the chiller.
The refrigerant charge is specified for each chiller model on the unit data plate or in the factory
order form (FOF) that is provided for every new sale. Charge the chiller based on the amount
specified in the FOF less 10%. For example, for a chiller that requires 500# of refrigerant, the
initial refrigerant charge is 450#, 500 - 50 = 450. This allows room to trim the charge as outlined in
Checking and trimming the refrigerant charge.
Charge the refrigerant in accordance with the method shown in this section. The weight of the
refrigerant charged must be recorded after the initial charging. Use the next section for trimming
the chiller for optimum operation based on the defined indicators, such as discharge superheat,
sub-cooling, and approaches.
Removing the refrigerant charge for service
151YVAM with OptiView Control Center
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