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Section 18. Pressure Curves
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB
TEMPERATURE, OUTDOOR TEMPERATURE, LIQUID AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1);
LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN.
EXAMPLE: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(
) 3
A
T
N I
T
E
R
S
E
C
T
O I
(
) 4
L
Q I
U
D I
P
R
E
S
S
U
R
(
) 5
S
U
C
T
O I
N
P
R
E
S
S
PRESSURE CURVES (Refer below table for models)
520
INDOOR ENTERING
WET BULB CURVES
470
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
420
370
320
(4)
270
220
170
40
170
INDOOR ENTERING
165
WET BULB CURVES
TOP TO BOTTOM
160
71, 67, 63 AND 59 DEG F.
155
150
145
(5)
140
135
130
125
120
115
110
40
18-AC128D1-1B-EN
N
E
@
6
0
0
C
F
M
S I
3
0
4
P
S
G I
U
R
E
@
6
0
0
C
F
M
S I
1
4
5
P
S
G I
(1)
50
60
70
OUTDOOR TEMPERATURE (Degree F)
(1)
50
60
70
OUTDOOR TEMPERATURE (Degree F)
A
C
T
U
A
: L
L
Q I
U
D I
P
S
U
C
T
O I
(3)
80
90
100
110
71
67
63
(3)
59
80
90
100
110
R
E
S
S
U
R
E
S
H
O
U
L
D
B
E
+
- /
1
0
P
N
P
R
E
S
S
U
R
E
S
H
O
U
L
D
B
E
+
- /
3
(2)
120
OD Model
5TTR4018A1
(2)
120
I S
O
F
C
H
A
R
T
P
S
G I
O
F
C
H
A
R
T
Cooling
@SCFM
600
23
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