American Standard 4A7A4018N Installation And Operation Manual page 38

520
470
420
370
320
270
220
170
170
165
160
155
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145
140
135
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120
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: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION
(4) LIQUID PRESSURE @ 600 CFM IS 297 PSIG
(5) SUCTION PRESSURE @ 600 CFM IS 141 PSIG
38
PRESSURE CURVES (Refer below table for models)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
(4)
(3)
50 60 70 80
OUTDOOR TEMPERATURE (Degree F)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
(5)
50 60 70 80
OUTDOOR TEMPERATURE (Degree F)
(1)
90 100 110
71
67
63
(3)
59
(1)
90 100 110
ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
(2)
OD Model
120
4A7A4024N1
4A7A4025N1
4A7A4030N1
4A7A4036N1
4A7A4042N1
(2)
120
11-AC11D1-9E-EN
Cooling
@SCFM
800
800
950
1000
1050