Characteristics Of R-290 - Riello NXHP Series Installation, Operation And Maintenance Instructions

5 -MAINTENANCE

5.7 - Characteristics of R-290

Saturated Temp. °C Gauge pressure, kPag
-20
-19
-18
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
11
The units use high-pressure refrigerant (compatible with the use of propane R-290). Special equipment must be used when working
on the refrigerant circuit (pressure gauge, charge transfer, etc.).
The units use high pressure R-290 refrigerant (propane). The unit operating pressure is above 20 bar when the outside air temperature
is 35 °C.
Note:
■ A vacuum pump is not enough to remove moisture from oil.
■ Oils absorb moisture rapidly. Do not expose oil to atmosphere.
■ Never open system to atmosphere while it is under vacuum.
■ When the system must be opened for service, break vacuum with dry nitrogen.
■ Do not vent R-290 into atmosphere.
Saturated temperatures based on the gauge pressure (in kPag)
Saturated Temp. °C
143 12
152 13
161 14
171 15
180 16
190 17
200 18
211 19
222 20
233 21
244 22
256 23
267 24
280 25
292 26
305 27
318 28
331 29
345 30
359 31
373 32
388 33
403 34
418 35
434 36
450 37
466 38
483 39
500 40
517 41
535 42
553 43
Gauge pressure, kPag Saturated Temp. °C
572
591
610
630
650
671
692
713
735
757
780
803
827
851
875
900
926
951
978
1005
1032
1060
1088
1117
1146
1176
1206
1237
1268
1300
1332
1365
Gauge pressure, kPag
44 1399
45 1433
46 1468
47 1503
48 1539
49 1575
50 1612
51 1650
52 1688
53 1727
54 1766
55 1806
56 1847
57 1888
58 1930
59 1972
60 2015
61 2059
62 2104
63 2149
64 2195
65 2242
66 2289
67 2337
68 2386
69 2435
70 2485
71 2536
72 2588
73 2641
74 2694
75 2748
65