American Standard 4A6V0024A1000B Service Facts page 65

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 .
(1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION
(4) LIQUID PRESSURE @ 400 CFM IS 295 PSIG
(5) SUCTION PRESSURE @ 1050 CFM IS 141 PSIG
INTERCONNECTING LINES
GAS - 3/4" O.D.
LIQUID - 3/8" O.D.
4A-V0-SF-1G-EN
Figure 25. 4A7V0036B
TAM8C0C36V31
Cooling with Electronic Expansion Valve
500
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM 71,
450
67, 63 AND 59 DEG F.
400
350
(4)
(3)
300
250
200
40 50 60 70 80
OUTDOOR TEMPERATURE (Degree F)
180
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM 71,
170
67, 63 AND 59 DEG F.
160
150
(3)
(5)
140
130
120
(1)
110
40 50 60 70 80
OUTDOOR TEMPERATURE (Degree F)
ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
(2)
90 100 110 120
(2)
90 100 110 120
DWG.NO.
P P r r e e s s s s u u r r e e C C u u r r v v e e s s
4A7V0036B1
65