Trane 4YCZ6024A1060A 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
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 @ 1120 CFM IS 304 PSIG
(5) SUCTION PRESSURE @ 1120 CFM IS 147 PSIG
34
Figure 12. Pressure Curves for 4YCZ6060
FIRST STAGE
1120 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
INDOOR ENTERING
500
WET BULB CURVES
TOP TO BOTTOM 71,
450
67, 63 AND 59 DEG F.
400
(4)
350
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 @ 1540 CFM IS 336 PSIG
(5) SUCTION PRESSURE @ 1540 CFM IS 144 PSIG
ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
1540 SCFM
(2)
(3)
(1)
70 80 90 100 110 120
(2)
(3)
(1)
70 80 90 100 110 120
DWG.NO. 4YCZ6060
18-EB28D1-12C-EN