Guidelines For The Utilization Of Guidelines For The Utilization Of - Tecumseh Page 2

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The use of hydrocarbon (HC) refrigerants R600a (isobutane) and R290 (propane)
for replacements for HCFC’s and HFC’s continues around the globe. R600a and
R290 have ozone depletion potential (ODP) factors of zero (0.0) and a fraction of
the global warming potential of those refrigerants they are intended to replace. Both
have acceptable toxicity levels; however, both are flammable.
Neither of these refrigerants are “drop-in” replacements for HCFC’s or HFC’s. There
are significant differences between R600a and R290, and the non-HC refrigerants
that must be considered in handling, processing and application. These guidelines are offered to help
understand these differences.
Tecumseh cannot control the final use and application of the compressors it sells, nor can Tecumseh
guarantee that compliance with agency standards will eliminate all risk of fire. However, we do urge all
OEM’s to use care in the selection and use of such compressors and to obtain appropriate certifications
from recognized testing agencies concerning compliance with all standards.
I.
REFRIGERANT PROPERTIES
A.
Pressure temperature table of R600a vs R143a and R290 vs. R404A shown in
Table 1.
Pressure PSIA (kPa Abs.)
Temperature °F
(°C)
R600a
R134a
R290
R404A*
-40 (-40.0)
4.1 (28.3)
7.4 (51.2)
16.1 (111.0)
19.3 (132.7)
-30 (-34.4)
5.4 (37.4)
9.9 (68.0)
20.3 (140.3)
24.6 (169.6)
-20 (-28.9)
7.0 (48.6)
12.9 (88.9)
25.4 (175.1)
31.0 (214.0)
-10 (-23.3)
9.0 (62.3)
16.6 (114.7)
31.4 (216.3)
38.7 (266.8)
0 (-17.8)
11.5 (79.0)
21.2 (146.0)
38.4 (264.5)
47.7 (329.1)
10 (-12.2)
14.3 (98.9)
26.6 (183.6)
46.5 (320.4)
58.3 (401.8)
20 (-6.7)
17.8 (122.5)
33.1 (228.4)
55.8 (384.8)
70.5 (486.2)
30 (-1.1)
21.8 (150.3)
40.8 (281.2)
66.5 (458.4)
84.6 (583.2)
40 (4.4)
26.5 (182.7)
49.7 (343.0)
78.6 (542.0)
100.7 (694.1)
50 (10.0)
31.9 (220.1)
60.1 (414.6)
92.3 (636.4)
118.9 (820.0)
60 (15.6)
38.2 (263.1)
72.1 (497.1)
107.7 (742.5)
139.6 (962.4)
70 (21.1)
45.3 (312.1)
85.8 (591.6)
124.9 (861.0)
162.8 (1122)
80 (26.7)
53.3 (367.6)
101.4 (699.0)
144.0 (992.8)
188.8 (1301)
90 (32.2)
62.4 (430.3)
119.0 (820.6)
165.2 (1139)
217.7 (1501)
100 (37.8)
72.6 (500.5)
138.9 (957.3)
188.6 (1300)
249.9 (1722)
110 (43.3)
83.9 (578.8)
161.1 (1111)
214.3 (1477)
285.5 (1968)
120 (48.9)
96.6 (665.8)
185.9 (1281)
242.5 (1672)
324.9 (2240)
130 (54.4)
110.5 (762.1)
213.4 (1471)
273.3 (1884)
368.4 (2540)
140 (60.0)
125.9 (868.3)
243.9 (1682)
306.9 (2116)
416.4 (2871)
150 (65.6)
142.8 (984.9)
277.6 (1914)
343.5 (2369)
469.6 (3237)
Source of Data Refprop 6.01
* Dew Point Pressures
Table 1: Pressure Temperature of R600a vs R143a and R290 vs R404A

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