18-AC108D1-1D-EN
29
Section 18. Pressure Curves
PRESSURE CURVES (Refer below table for models)
OUTDOOR TEMPERATURE (Degree F)
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, 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) AT INTERSECTION
ACTUAL:
(4) LIQUID PRESSURE @ 600 CFM IS 309 PSIG
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 600 CFM IS 142 PSIG
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
120
125
130
135
140
145
150
155
160
165
170
175
180
50
60
70
80
90
100
110
120
(1)
200
250
300
350
400
450
500
50
60
70
80
90
100
110
120
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
Cooling
@SCFM
4TTA4036A3
4TTA4042A3
OD Model
1100
1300
4TTA4036A4
4TTA4042A4
1100
1300
59
71
67
63
LI
QU
ID PRESSURE (PSIG)
SU
CT
ION PRESSURE (PSIG)
