Allied Air Enterprises 4AC16LT - Manual (Page 14)

506467-01 Issue 1008 Page 14
6. Compare the approach value with those shown in Table
7. If the values do not agree with those provided in Table 7,
add refrigerant to lower the approach temperature or recover
refrigerant from the system to increase the approach
temperature.
Check Charge Using Normal Operating Pressures
Use Table 8 to perform maintenance checks. Table 8 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.
=
_
Outdoor Ambient Temperature °F
Liquid Line Temperature °F
Approach Temperature °F
°
°
°
Table 5
T e m p .
(F
P re s s u re
P s ig
T e m p .
(F
P re s s u re
P s ig
T e m p .
(F
P re s s u re
P s ig
3 2 1 0 0 .8 7 4 2 1 4 .0 1 1 6 3 9 6 .0
3 3 1 0 2 .9 7 5 2 1 7 .4 1 1 7 4 0 1 .3
3 4 1 0 5 .0 7 6 2 2 0 .9 1 1 8 4 0 6 .7
3 5 1 0 7 .1 7 7 2 2 4 .4 1 1 9 4 1 2 .2
3 6 1 0 9 .2 7 8 2 2 8 .0 1 2 0 4 1 7 .7
3 7 1 1 1 .4 7 9 2 3 1 .6 1 2 1 4 2 3 .2
3 8 1 1 3 .6 8 0 2 3 5 .3 1 2 2 4 2 8 .8
3 9 1 1 5 .8 8 1 2 3 9 .0 1 2 3 4 3 4 .5
4 0 1 1 8 .0 8 2 2 4 2 .7 1 2 4 4 4 0 .2
4 1 1 2 0 .3 8 3 2 4 6 .5 1 2 5 4 4 5 .9
4 2 1 2 2 .6 8 4 2 5 0 .3 1 2 6 4 5 1 .8
4 3 1 2 5 .0 8 5 2 5 4 .1 1 2 7 4 5 7 .6
4 4 1 2 7 .3 8 6 2 5 8 .0 1 2 8 4 6 3 .5
4 5 1 2 9 .7 8 7 2 6 2 .0 1 2 9 4 6 9 .5
4 6 1 3 2 .2 8 8 2 6 6 .0 1 3 0 4 7 5 .6
4 7 1 3 4 .6 8 9 2 7 0 .0 1 3 1 4 8 1 .6
4 8 1 3 7 .1 9 0 2 7 4 .1 1 3 2 4 8 7 .8
4 9 1 3 9 .6 9 1 2 7 8 .2 1 3 3 4 9 4 .0
5 0 1 4 2 .2 9 2 2 8 2 .3 1 3 4 5 0 0 .2
5 1 1 4 4 .8 9 3 2 8 6 .5 1 3 5 5 0 6 .5
5 2 1 4 7 .4 9 4 2 9 0 .3 1 3 6 5 1 2 .9
5 3 1 5 0 .1 9 5 2 9 5 .1 1 3 7 5 1 9 .3
5 4 1 5 2 .8 9 6 2 9 9 .4 1 3 8 5 2 5 .8
5 5 1 5 5 .5 9 7 3 0 3 .8 1 3 9 5 3 2 .4
5 6 1 5 8 .2 9 8 3 0 8 .2 1 4 0 5 3 9 .0
5 7 1 6 1 .0 9 9 3 1 2 .7 1 4 1 5 4 5 .6
5 8 1 6 3 .9 1 0 0 3 1 7 .2 1 4 2 5 5 2 .3
5 9 1 6 6 .7 1 0 1 3 2 1 .8 1 4 3 5 5 9 .1
6 0 1 6 9 .6 1 0 2 3 2 6 .4 1 4 4 5 6 5 .9
6 1 1 7 2 .6 1 0 3 3 3 1 .0 1 4 5 5 7 2 .8
6 2 1 7 5 .5 1 0 4 3 3 5 .7 1 4 6 5 7 9 .8
6 3 1 7 8 .5 1 0 5 3 4 0 .5 1 4 7 5 8 6 .8
6 4 1 8 1 .6 1 0 6 3 4 5 .3 1 4 8 5 9 3 .8
6 5 1 8 4 .3 1 0 7 3 5 0 .1 1 4 9 6 0 1 .0
6 6 1 8 7 .7 1 0 8 3 5 5 .0 1 5 0 6 0 8 .1
6 7 1 9 0 .9 1 0 9 3 6 0 .0 1 5 1 6 1 5 .4
6 8 1 9 4 .1 1 1 0 3 6 5 .0 1 5 2 6 2 2 .7
6 9 1 9 7 .3 1 1 1 3 7 0 .0 1 5 3 6 3 0 .1
7 0 2 0 0 .6 1 1 2 3 7 5 .1 1 5 4 6 3 7 .5
7 1 2 0 3 .9 1 1 3 3 8 0 .2 1 5 5 6 4 5 .0
7 2 2 0 7 .2 1 1 4 3 8 5 .4
7 3 2 1 0 .6 1 1 5 3 9 0 .7
7 2 2 0 7 .2 1 1 4 3 8 5 .4
7 3 2 1 0 .6 1 1 5 3 9 0 .7
R410A Temperature/Pressure Chart
Table 6
Subcooling Values
Table 7
Approach Values for TXV Systems
Approach value is the liquid line temperature minus
the outdoor ambient temperature (± 1°F).
Note: For best results, use the same digital
thermometer to check both outdoor ambient and
liquid temperatures.