4
4TCA4048A-SF-1B-EN
Pressure Curves
Figure 1.
4TCA4048A1
110
115
120
125
130
135
140
145
150
155
160
165
170
40
60
80
100
120
(1)
(3)
(5)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
200
250
300
350
400
450
500
550
40
60
80
100
120
(1)
(3)
(4)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
D
IS
C
H
A
R
G
E
P
R
E
S
S
U
R
E
(
P
S
IG
)
OUTDOOR TEMPERATURE (Degree F)
S
U
C
T
IO
N
P
R
E
S
S
U
R
E
(
P
S
IG
)
OUTDOOR TEMPERATURE (Degree F)
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, DISCHARGE 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 DISCHARGE OR SUCTION PRESSURE IN LEFT COLUMN (4).
EXAMPLE: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION
ACTUAL:
(4) DISCHARGE PRESSURE @ 1500 CFM CFM IS 334 PSIG.
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 1500 CFM CFM IS 137 PSIG.
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
DWG.NO.
4TCA4048A1
Cooling
1500 CFM
