HVAC · PT Chart

R-407C PT Chart

Pressure–temperature saturation chart for R-407C (provisional — verify before charging). Convert pressure to saturation temperature and back, or print the full table.

Convert

Gauge pressure

psig

Blend: use the dew value for suction (superheat) and the bubble value for liquid (subcooling).

R-407C saturation

55.2°F

Sat temp (dew)

55.2°F

Sat temp (bubble)

49.6°F

R-407C saturation table

psig at sea level · A1

Temp (°F)	Bubble (psig)	Dew (psig)
-40	4	0
-38	5.1	1
-36	6.1	1.9
-34	7.1	2.8
-32	8.1	3.8
-30	9.1	4.7
-28	10.2	5.6
-26	11.3	6.6
-24	12.4	7.7
-22	13.7	8.8
-20	15	10
-18	16.5	11.3
-16	18.1	12.7
-14	19.8	14.2
-12	21.6	15.9
-10	23.5	17.5
-8	25.5	19.3
-6	27.5	21.1
-4	29.7	23
-2	31.8	25
0	34	27
2	36.2	29.1
4	38.5	31.3
6	40.9	33.6
8	43.4	35.9
10	45.9	38.4
12	48.6	41
14	51.3	43.6
16	54.1	46.4
18	57	49.1
20	60	52
22	63.1	55
24	66.5	58
26	69.9	61.2
28	73.5	64.6
30	77.2	68
32	81.1	71.5
34	85	75
36	88.9	78.6
38	93	82.3
40	97	86
42	101.1	89.8
44	105.4	93.6
46	109.8	97.6
48	114.3	101.7
50	119	106
52	123.9	110.5
54	129	115.1
56	134.2	119.9
58	139.5	124.9
60	145	130
62	150.5	135.3
64	156.2	140.7
66	161.9	146.3
68	167.9	152.1
70	174	158
72	180.4	164.1
74	187	170.3
76	193.9	176.7
78	200.9	183.3
80	208	190
82	215.3	196.9
84	222.7	203.9
86	230.3	211.1
88	238	218.4
90	246	226
92	254.2	233.8
94	262.6	241.8
96	271.2	250
98	280	258.4
100	289	267
102	298.2	275.8
104	307.5	284.8
106	317.1	294
108	327	303.4
110	337	313
112	347.3	322.8
114	357.9	332.7
116	368.7	342.9
118	379.7	353.4
120	391	364
122	402.5	374.9
124	414.3	386.1
126	426.3	397.5
128	438.5	409.1
130	451	421
132	463.8	433.2
134	476.9	445.7
136	490.3	458.5
138	503.7	471.3
140	517	484

Bubble vs. dew — how to read a blend

R-407C is a refrigerant blend, so it boils and condenses across a small temperature range (glide of ~7 °F (high glide)) rather than at a single point. The bubble line is where liquid starts to boil; the dew line is where the last vapor condenses. For charge checks: use the dew temperature for superheat on the suction line, and the bubble temperature for subcooling on the liquid line.

Frequently asked

What pressure should R-407C run at?

It depends on the saturation temperature you are targeting, not a single number. Read your gauge pressure, convert it to a saturation temperature with the chart above, then compare it to your line temperature for superheat or subcooling.

Does R-407C have temperature glide?

R-407C is a blend with glide of ~7 °F (high glide). Use the dew (vapor) temperature for superheat on the suction line and the bubble (liquid) temperature for subcooling on the liquid line.

Is this R-407C PT chart accurate for charging?

Use it for field reference. This chart is interpolated from published manufacturer anchor points and is marked provisional — confirm against the manufacturer PT chart before final charging.

Sources & references

CoolProp — open-source thermophysical property library used to generate the saturation curves
EPA Section 608 — refrigerant handling and the venting prohibition
ASHRAE Handbook — Fundamentals — refrigerant and psychrometric property basis

Estimates for planning purposes only. Verify all results against the code edition adopted in your jurisdiction and with your Authority Having Jurisdiction (AHJ). This tool is not a substitute for a licensed HVAC contractor. See our methodology, sources, and code editions.