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Section 19. 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, 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 INTERSECTIO
(4) DISCHARGE PRESSURE @ 670 CFM IS 318 PSIG.
(5) SUCTION PRESSURE @ 670 CFM IS 149 PSIG.
18-BC117D1-1B-EN
N
PRESSURE CURVES for 5TWR4018A1
520
INDOOR ENTERING
WET BULB CURVES
470
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
420
370
(3)
320
(4)
270
220
(1)
170
50
60
70
80
OUTDOOR TEMPERATURE (Degree F)
170
INDOOR ENTERING
165
WET BULB CURVES
160
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
155
150
145
140
(5)
(3)
135
130
125
120
115
(1)
110
50
60
70
80
OUTDOOR TEMPERATURE (Degree F)
A
CTUAL:
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
(2)
OD Model
90
100
110
120
5TWR4018A1
(2)
90
100
110
120
Cooling @SCFM
650
27
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