Lennox International Inc 506510-01 installation instructions Operating and Temperature Pressures

Operating and Temperature Pressures

Minor variations in these pressures may be expected due to differences in installations. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system.

Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)*

					Use this table to perform maintenance checks; it is not a procedure for charging the
IMPORTANT					system. Minor variations in these pressures may be due to differences in installations.
					Significant deviations could mean that the system is not properly charged or that a
					problem exists with some component in the system.
Model		−024			−030			−036			−042			−048			−060
°F (°C)**	Liquid		Suction	Liquid		Suction	Liquid		Suction	Liquid		Suction	Liquid		Suction	Liquid		Suction
65 (18.3)	234		139	236		134	226		134	232		137	232		132	236		131
70 (21.1)	249		140	251		135	245		135	249		139	249		133	254		132
75 (23.9)	268		141	271		138	266		137	270		140	268		134	273		133
80 (26.7)	289		142	291		139	287		138	291		141	288		135	294		135
85 (29.4)	310		142	312		140	310		139	314		142	311		136	317		136
90 (32.2)	334		144	335		142	333		140	338		143	333		137	340		137
95 (35.0)	358		145	358		142	358		141	363		144	357		138	364		139
100 (37.8)	383		146	383		143	383		143	389		145	380		139	389		140
105 (40.6)	408		147	409		144	410		144	419		147	406		140	416		142
110 (43.3)	436		148	436		145	437		145	447		148	433		142	444		143
115 (46.1)	465		150	467		147	464		146	480		149	462		143	475		145

*Typical pressures only, expressed in psig (liquid +/− 10 and vapor+/− 5 psig); indoor match up, indoor air quality, and indoor load will cause the pressures to vary. These operating pressures are also listed on the unit charging sticker (580005−01) located on the access panel.

** Temperature of air entering outdoor coil.

Table 5. HFC−410A Temperature (° Fahrenheit)

°F	Psig	°F	Psig	°F	Psig	°F	Psig	°F	Psig	°F	Psig	°F	Psig	°F	Psig
32	100.8	48	137.1	63	178.5	79	231.6	94	290.8	110	365.0	125	445.9	141	545.6
33	102.9	49	139.6	64	181.6	80	235.3	95	295.1	111	370.0	126	451.8	142	552.3
34	105.0	50	142.2	65	184.3	81	239.0	96	299.4	112	375.1	127	457.6	143	559.1
35	107.1	51	144.8	66	187.7	82	242.7	97	303.8	113	380.2	128	463.5	144	565.9
36	109.2	52	147.4	67	190.9	83	246.5	98	308.2	114	385.4	129	469.5	145	572.8
37	111.4	53	150.1	68	194.1	84	250.3	99	312.7	115	390.7	130	475.6	146	579.8
38	113.6	54	152.8	69	197.3	85	254.1	100	317.2	116	396.0	131	481.6	147	586.8
39	115.8	55	155.5	70	200.6	86	258.0	101	321.8	117	401.3	132	487.8	148	593.8
40	118.0	56	158.2	71	203.9	87	262.0	102	326.4	118	406.7	133	494.0	149	601.0
41	120.3	57	161.0	72	207.2	88	266.0	103	331.0	119	412.2	134	500.2	150	608.1
42	122.6	58	163.9	73	210.6	89	270.0	104	335.7	120	417.7	135	506.5	151	615.4
43	125.0	59	166.7	74	214.0	90	274.1	105	340.5	121	423.2	136	512.9	152	622.7
44	127.3	60	169.6	75	217.4	91	278.2	106	345.3	122	428.8	137	519.3	153	630.1
45	129.7	61	172.6	76	220.9	92	282.3	107	350.1	123	434.5	138	525.8	154	637.5
46	132.2	62	175.4	77	224.4	93	286.5	108	355.0	124	440.2	139	532.4	155	645.0
47	134.6			78	228.0			109	360.0			140	539.0

Page 30

506510−01