Lenox Elite Series XP16 Units Heat Pumps, P506640-01 Normal Operating Pressures

NORMAL OPERATING PRESSURES

Use the following tables to perform maintenance checks; it is not a procedure for charging the 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.

Typical pressures only, expressed in psig (liquid +/− 10 and vapor +/− 5 psig); matched indoor component (air handler or coil), indoor air quality, and indoor load will cause the pressures to vary.

Table 7. Normal Operating Pressures*

Normal Operating Pressures − Cooling

XP16	−024		−036		−048		−060
°F	Liq	Vap	Liq	Vap	Liq	Vap	Liq	Vap
(°C)**
		First Stage (Low Capacity) Pressure
65	226	144	220	141	224	143	230	137
(18.3)
75	260	145	254	144	259	143	267	139
(23.9)
85	301	148	295	148	302	147	311	141
(29.4)
95	346	151	340	150	346	149	357	144
(35.0)
105	396	153	389	153	396	152	398	147
(40.6)
115	451	156	444	156	450	155	453	149
(46.1)
	Second Stage (High Capacity) Pressure
65	241	140	232	129	238	138	232	131
(18.3)
75	279	142	269	136	278	140	276	133
(23.9)
85	321	144	312	140	321	142	320	136
(29.4)
95	369	146	346	142	372	144	367	138
(35.0)
105	421	148	409	145	424	147	421	141
(40.6)
115	480	151	465	148	481	149	479	144
(46.1)
	Normal Operating Pressures − Heating
		First Stage (Low Capacity) Pressure
50	312	112	350	115	336	114	385	108
(10)
60	330	130	372	136	363	135	414	126
(15.5)
	Second Stage (High Capacity) Pressure
20	299	64	321	61	289	57	332	59
(−7.0)
30	312	79	347	74	294	69	349	67
(−1.0)
40	325	93	367	90	321	80	361	75
(4.4)
50	344	110	387	110	341	110	383	85
(10)

60

(15.5) 358 128 395 131 361 128 425 122

** Temperature of air entering outdoor coil.

TEMPERATURE PRESSURES

Compute subcooling by determining saturated condensing temperature from temperature pressure chart. Subtract from liquid temperature entering TXV.

Table 8. HFC−410A Temperature (°F) −

Pressure (Psig)

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

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XP16 SERIES