Trane 4YCC4024E1060A Installation And Operation Manual page 30

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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
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 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) DISCHARGE PRESSURE @ 900 CFM CFM IS 320 PSIG.
(5) SUCTION PRESSURE @ 900 CFM CFM IS 136 PSIG.
30
Figure 10. Pressure Curve – 4YCC4030E1
Cooling
500
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG
450
400
(3)
(4)
350
300
250
200
40
60
80
OUTDOOR TEMPERATURE (Degree F)
210
INDOOR ENTERING
WET BULB CURVES
190
TOP TO BOTTOM
DEG F.
170
150
(3)
130
(5)
110
90
70
(1)
50
40
60
80
OUTDOOR TEMPERATURE (Degree F)
(2)
100
120
(2)
100
120
ACTUAL:
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
Dwg. 4YCC4030E1
18-EB40D1-1E-EN

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