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U U n n i i t t S S t t a a r r t t u u p p
500
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM 71,
450
67, 63 AND 59 DEG F.
400
350
(4)
300
250
200
40
50
INDOOR ENTERING
190
WET BULB CURVES
TOP TO BOTTOM 71,
180
67, 63 AND 59 DEG F.
170
160
(5)
150
140
130
120
40
50
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: FIRST STAGE
(1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION
(4) LIQUID PRESSURE @ 830 CFM IS 288 PSIG
(5) SUCTION PRESSURE @ 830 CFM IS 149 PSIG
30
Figure 10. Pressure Curves for 4YCZ5036F
FIRST STAGE
830 SCFM
(2)
(3)
(1)
60
70
80
90
100
110
OUTDOOR TEMPERATURE (Degree F)
(2)
(3)
(1)
60
70
80
90
100
110
OUTDOOR TEMPERATURE (Degree F)
SECOND STAGE
1175 SCFM
INDOOR ENTERING
500
WET BULB CURVES
TOP TO BOTTOM 71,
450
67, 63 AND 59 DEG F.
400
350
(4)
300
250
200
120
40
50
60
INDOOR ENTERING
190
WET BULB CURVES
TOP TO BOTTOM 71,
180
67, 63 AND 59 DEG F.
170
160
150
(5)
140
130
120
120
40
50
60
EXAMPLE: SECOND STAGE
(1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION
(4) LIQUID PRESSURE @ 1175 CFM IS 312 PSIG
(5) SUCTION PRESSURE @ 1175 CFM IS 144 PSIG
ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
(2)
(3)
(1)
70
80
90
100
110
120
(2)
(3)
(1)
70
80
90
100
110
120
DWG.NO.
4YCZ5036F
18-EB41D1-1C-EN
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