Armstrong Air Conditioning 4SCU13LE Series Installation And Maintenance Instructions Manual - Page 16
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O
u
d t
o
r o
C
o
l i
E
t n
r e
n i
g
A
r i
T
e
m
p
e
a r
u t
e r
6
5
F °
7
5
F °
8
5
F °
9
5
F °
1
0
5
F °
1
1
5
F °
6
5
F °
7
5
F °
8
5
F °
9
5
F °
1
0
5
F °
1
1
5
F °
* These are typical pressures only. Indoor matchup,
indoor air quality, and indoor load will cause the
pressures to vary.
_____ °
Liquid Line Temperature °F
–
_____ °
Outdoor Ambient Temperature °F
=
_____ °
Approach Temperature °F
6. Compare the approach value with those shown in
Table 10. If the values to do not agree with those
provided in Table 10, 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 9 to perform maintenance checks. Table 9 is
not a procedure for charging the system. Minor variations
in these pressures may be due to differences in installa-
tions. Significant deviations could mean that the system is
not properly charged or that a problem exists with some
component in the system.
Page 16
Normal Operating Pressures*
-
8 1
2 -
4
L
S
L
S
E
x
p
a
n
2
3
7
1
3
5
2
4
4
1
3
6
2
7
5
1
3
7
2
8
3
1
3
8
3
1
7
1
3
9
3
2
6
1
4
1
3
6
3
1
4
2
3
7
6
1
4
2
4
1
3
1
4
4
4
2
8
1
4
4
4
7
1
1
4
7
4
8
6
1
4
6
F
x i
e
d
2
3
8
1
3
0
2
4
9
1
2
6
2
7
3
1
3
4
2
8
8
1
3
3
3
1
6
1
4
1
3
3
1
1
3
8
3
6
3
1
4
7
3
7
9
1
4
3
4
1
1
1
5
1
4
2
5
1
4
7
4
6
7
1
5
5
4
8
1
1
5
0
M
o
d
l e
3 -
0
3 -
6
L
S
L
S
s
o i
n
V
a
v l
e
T (
X
) V
2
4
3
1
3
1
2
3
8
1
3
3
2
8
1
1
3
2
2
7
8
1
3
5
3
2
5
1
3
4
3
2
4
1
3
7
3
7
2
1
3
6
3
7
4
1
3
9
4
2
2
1
3
9
4
2
9
1
4
2
4
7
8
1
4
1
5
0
0
1
4
4
O
r
f i
c i
e
(
R
F
C
)
2
3
9
1
2
4
2
5
1
1
2
9
2
7
7
1
2
9
2
9
1
1
3
5
3
2
0
1
3
5
3
3
4
1
3
9
3
6
5
1
4
0
3
8
3
1
4
3
4
1
4
1
4
3
4
3
5
1
4
7
4
6
8
1
4
7
4
9
0
1
5
0
L = Liquid S = Suction
Table 9
Approach Values for TXV Systems
M
o
d
l e
-
8 1
e T
m
. p
1
2
F °
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.
4 -
2
4 -
8
L
S
L
S
2
3
1
1
2
9
2
4
7
1
3
0
2
6
9
1
3
1
2
8
1
1
3
4
3
1
4
1
3
4
3
2
5
1
3
7
3
6
2
1
3
5
3
8
6
1
3
9
4
0
9
1
3
9
4
2
8
1
4
1
4
6
3
1
4
2
4
8
5
1
4
4
2
4
0
1
2
0
2
4
9
1
2
3
2
8
0
1
2
8
2
8
6
1
2
9
3
2
3
1
3
3
3
2
8
1
3
3
3
6
8
1
3
7
3
7
2
1
3
7
4
7
1
1
4
1
4
1
9
1
4
1
4
6
8
1
4
4
4
7
5
1
4
5
2 -
4
3 -
0
3 -
6
4 -
2
1
2
7
1
0
7
Table 10
6 -
0
L
S
2
5
0
1
2
5
2
9
1
1
2
7
3
3
4
1
3
0
3
8
3
1
3
3
4
3
4
1
3
6
4
8
9
1
3
9
2
4
3
1
1
7
2
8
5
1
2
3
3
2
9
1
2
9
3
7
6
1
3
4
4
2
7
1
3
7
4
8
5
1
4
1
4 -
8
6 -
0
7
9
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