Lennox International Inc 4HP18LT manual R410A Temperature/Pressure Chart

R410A Temperature/Pressure Chart

	T e m p .	P re s s u re
	(F	P s ig
	3 2	1 0 0 . 8
3 3		1 0 2 . 9
3 4		1 0 5 . 0
3 5		1 0 7 . 1
3 6		1 0 9 . 2
3 7		1 1 1 . 4
3 8		1 1 3 . 6
3 9		1 1 5 . 8
4 0		1 1 8 . 0
4 1		1 2 0 . 3
4 2		1 2 2 . 6
4 3		1 2 5 . 0
4 4		1 2 7 . 3
4 5		1 2 9 . 7
4 6		1 3 2 . 2
4 7		1 3 4 . 6
4 8		1 3 7 . 1
4 9		1 3 9 . 6
5 0		1 4 2 . 2
5 1		1 4 4 . 8
5 2		1 4 7 . 4
5 3		1 5 0 . 1
5 4		1 5 2 . 8
5 5		1 5 5 . 5
5 6		1 5 8 . 2
5 7		1 6 1 . 0
5 8		1 6 3 . 9
5 9		1 6 6 . 7
6 0		1 6 9 . 6
6 1		1 7 2 . 6
6 2		1 7 5 . 5
6 3		1 7 8 . 5
6 4		1 8 1 . 6
6 5		1 8 4 . 3
6 6		1 8 7 . 7
6 7		1 9 0 . 9
6 8		1 9 4 . 1
6 9		1 9 7 . 3
7 0		2 0 0 . 6
7 1		2 0 3 . 9
	7 2
		2 0 7 . 2
	7 3	2 1 0 . 6
	7 2	2 0 7 . 2
	7 3	2 1 0 . 6

T e m p .	P re s s u re
(F	P s ig
7 4	2 1 4 . 0
7 5
	2 1 7 . 4
7 6	2 2 0 . 9
7 7	2 2 4 . 4
7 8
	2 2 8 . 0
7 9	2 3 1 . 6
8 0	2 3 5 . 3
8 1
	2 3 9 . 0
8 2	2 4 2 . 7
8 3	2 4 6 . 5
8 4
	2 5 0 . 3
8 5	2 5 4 . 1
8 6	2 5 8 . 0
8 7
	2 6 2 . 0
8 8	2 6 6 . 0
8 9	2 7 0 . 0
9 0
	2 7 4 . 1
9 1	2 7 8 . 2
9 2	2 8 2 . 3
9 3
	2 8 6 . 5
9 4	2 9 0 . 3
9 5	2 9 5 . 1
9 6
	2 9 9 . 4
9 7	3 0 3 . 8
9 8	3 0 8 . 2
9 9
	3 1 2 . 7
1 0 0	3 1 7 . 2
1 0 1	3 2 1 . 8
1 0 2
	3 2 6 . 4
1 0 3	3 3 1 . 0
1 0 4	3 3 5 . 7
1 0 5
	3 4 0 . 5
1 0 6	3 4 5 . 3
1 0 7	3 5 0 . 1
1 0 8
	3 5 5 . 0
1 0 9	3 6 0 . 0
1 1 0	3 6 5 . 0
1 1 1
	3 7 0 . 0
1 1 2	3 7 5 . 1
1 1 3	3 8 0 . 2
1 1 4
	3 8 5 . 4
1 1 5	3 9 0 . 7
1 1 4
	3 8 5 . 4
1 1 5	3 9 0 . 7

T e m p .	P re s s u re
(F	P s ig
1 1 6	3 9 6 . 0
	4 0 1 . 3
1 1 7
1 1 8	4 0 6 . 7
1 1 9	4 1 2 . 2
1 2 0	4 1 7 . 7
1 2 1	4 2 3 . 2
1 2 2	4 2 8 . 8
1 2 3	4 3 4 . 5
1 2 4	4 4 0 . 2
1 2 5	4 4 5 . 9
1 2 6	4 5 1 . 8
1 2 7	4 5 7 . 6
1 2 8	4 6 3 . 5
1 2 9	4 6 9 . 5
1 3 0	4 7 5 . 6
1 3 1	4 8 1 . 6
1 3 2	4 8 7 . 8
1 3 3	4 9 4 . 0
1 3 4	5 0 0 . 2
1 3 5	5 0 6 . 5
1 3 6	5 1 2 . 9
1 3 7	5 1 9 . 3
1 3 8	5 2 5 . 8
1 3 9	5 3 2 . 4
1 4 0	5 3 9 . 0
1 4 1	5 4 5 . 6
1 4 2	5 5 2 . 3
1 4 3	5 5 9 . 1
1 4 4	5 6 5 . 9
1 4 5	5 7 2 . 8
1 4 6	5 7 9 . 8
1 4 7	5 8 6 . 8
1 4 8	5 9 3 . 8
1 4 9	6 0 1 . 0
1 5 0	6 0 8 . 1
1 5 1	6 1 5 . 4
1 5 2	6 2 2 . 7
1 5 3	6 3 0 . 1
1 5 4	6 3 7 . 5
1 5 5
	6 4 5 . 0

5. Compare the subcooling value with those shown in Table

7.If subcooling is greater than shown, recover some refrigerant. If subcooling is less than shown, add some refrigerant.

Subcooling Values

Table 6

Charge Using Approach Method (TXV System) - Outdoor Temperatures 65°F or Above

The following procedure is intended as a general guide and is for use on expansion valve systems only. For best results, indoor temperature should be 70°F to 80°F. Monitor system pressures while charging.

1.Record outdoor ambient temperature usig a digital thermometer.

2.Attach high pressure gauge set and operate unit for several minutes to allow system pressures to stabilize.

3.Compare stabilized pressures with those provided in Table

8.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. Pressures higher than those listed indicate that the system is overcharged. Pressures lower than those listed indicate that the system is undercharged. Verify adjusted charge using the approach method.

4.Use the same digital thermometer to check liquid line temperature.

5.Subtract the outdoor ambient temperature from the liquid line temperture to determine the approach temperature.

Table 5

506470-01 Issue 1007 Page 15