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Section 18. Pressure Curves
PRESSURE CURVES (Refer below table for models)
520
470
420
370
320
270
220
170
40
170
165
160
155
150
145
140
135
130
125
120
115
110
40
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
(4) LIQUID PRESSURE @ 600 CFM IS 286 PSIG
(5) SUCTION PRESSURE @ 600 CFM IS 143 PSIG
88-A5AC4001-1A-EN
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
(4)
50
60
70
OUTDOOR TEMPERATURE (Degree F)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
(5)
50
60
70
OUTDOOR TEMPERATURE (Degree F)
(3)
(1)
80
90
100
110
(3)
(1)
80
90
100
110
ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
(2)
120
OD Model
A5AC4018A1
71
(2)
67
63
59
120
Cooling
@SCFM
600
25
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