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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.
520
470
420
370
320
270
220
170
170
165
160
155
150
145
140
135
130
125
120
115
110
18-BC119D1-1A-EN
N
PRESSURE CURVES for 5TWX5018A1
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
(3)
(4)
(1)
50
60
70
80
90
OUTDOOR TEMPERATURE (Degree F)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
(5)
(3)
(1)
50
60
70
80
90
OUTDOOR TEMPERATURE (Degree F)
A
CTUAL:
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
(2)
100
110
120
OD Model
5TWX5018A1
(2)
100
110
120
Cooling @SCFM
650
27
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