HVAC · PT Chart

R-454B PT Chart

Pressure–temperature saturation chart for R-454B (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-454B saturation

43.3°F

Sat temp (dew)

43.3°F

Sat temp (bubble)

41.4°F

R-454B saturation table

psig at sea level · A2L

Temp (°F)	Bubble (psig)	Dew (psig)
-40	10	8
-38	11.4	9.3
-36	12.7	10.5
-34	14	11.7
-32	15.3	12.9
-30	16.6	14.1
-28	18	15.3
-26	19.3	16.6
-24	20.8	18
-22	22.3	19.4
-20	24	21
-18	25.8	22.7
-16	27.7	24.6
-14	29.7	26.6
-12	31.8	28.7
-10	34	30.9
-8	36.2	33.2
-6	38.6	35.6
-4	41	38
-2	43.5	40.5
0	46	43
2	48.6	45.5
4	51.3	48.2
6	54.1	50.8
8	57	53.6
10	59.9	56.5
12	63	59.4
14	66.1	62.4
16	69.4	65.5
18	72.6	68.7
20	76	72
22	79.5	75.4
24	83	79
26	86.7	82.7
28	90.5	86.5
30	94.4	90.5
32	98.4	94.5
34	102.5	98.6
36	106.6	102.7
38	110.8	106.8
40	115	111
42	119.3	115.2
44	123.7	119.4
46	128.3	123.7
48	133.1	128.2
50	138	133
52	143.2	138.2
54	148.7	143.7
56	154.4	149.4
58	160.2	155.2
60	166	161
62	171.8	166.7
64	177.7	172.3
66	183.6	178
68	189.7	183.9
70	196	190
72	202.5	196.4
74	209.1	203.1
76	215.9	209.9
78	222.9	216.9
80	230	224
82	237.3	231.1
84	244.7	238.4
86	252.3	245.7
88	260.1	253.3
90	268	261
92	276.1	269
94	284.3	277.2
96	292.7	285.7
98	301.2	294.3
100	310	303
102	319	311.9
104	328.2	320.9
106	337.6	330.1
108	347.2	339.4
110	357	349
112	366.9	358.7
114	376.8	368.4
116	387.1	378.5
118	397.7	388.9
120	409	400
122	421	411.8
124	433.8	424.4
126	447.1	437.5
128	460.9	451.1
130	475	465
132	489.6	479.4
134	504.9	494.5
136	520.6	510
138	536.4	525.6
140	552	541

Bubble vs. dew — how to read a blend

R-454B is a refrigerant blend, so it boils and condenses across a small temperature range (glide of ~1.5 °F) 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-454B 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-454B have temperature glide?

R-454B is a blend with glide of ~1.5 °F. 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-454B 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.