Trane 4YCC4024E1060A Installation And Operation Manual page 34

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 @ 1750 CFM CFM IS 335 PSIG. DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 1750 CFM CFM IS 140 PSIG.
34
Figure 14. Pressure Curve – 4YCC4060E1
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)
170
INDOOR ENTERING
165
WET BULB CURVES
TOP TO BOTTOM
160
71, 67, 63 AND 59
DEG F.
155
150
145
(5)
140
135
130
125
120
115
(1)
110
40 60
OUTDOOR TEMPERATURE (Degree F)
(2)
100 120
(2)
(3)
80 100 120
ACTUAL:
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
DWG.NO. 4YCC4060E1
18-EB40D1-1E-EN