2.1 Operational Envelopes
The following operational envelopes, based on
65°F (18°C) return gas, show the allowable
operating suction and discharge pressure
ranges for R-134a, R-22, and R-507/R-404A.
Operation outside of these envelopes requires
Section 2 — Operating Specifications
6
R-134a APPLICATIONS
Saturated Discharge
T
emperature deg F (deg C)
120
60
140
0
20
40
80
100
(60)
(49)
(38)
(27)
(16)
(4)
(-7)
(-18)
20
-10
-5
0
5
10
15
25
30
35
(-23)
(-21)
(-18)
(-15)
(-12)
(-9)
(-7)
(-4)
(-1)
(2)
Saturated Suction Temperature deg F (deg C)
160
(71)
40
(4)
45
(7)
50
(10)
55
(13)
Disch T
emp
Control
Oil Cooling Control
R-22 APPLICATIONS
Saturated Discharge
T
emperature deg F (deg C)
120
60
140
0
20
40
80
100
(60)
(49)
(38)
(27)
(16)
(4)
(-7)
(-18)
-40
-35
-30
-25
-20
20
-15
-10
-5
0
5
10
15
25
30
35
(-40) (-37)
(-34) (-32)
(-29)
(-26) (-23) (-21)
(-18) (-15) (-12)
(-9)
(-7)
(-4)
(-1)
(2)
Saturated Suction Temperature deg F (deg C)
Disch T
emp
Control
Oil Cooling Control
Discharge
Temperature
Control and
Oil Cooling
Required
Oil Cooling
Required
40
45
50
No Oil or Discharge
Control
Requirements
(5)
(8)
(11)
approval from Carlyle Application Engineering
or warranty is voided. Oil cooling can be
achieved through the use of an oil cooler or
with desuperheating valves (as described in
Oil Cooling Systems, Section 3.7)