American Standard 4A7A4018N Installation And Operation Manual page 42

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 321 PSIG
(5) SUCTION PRESSURE @ 600 CFM IS 140 PSIG
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11-AC11D1-9E-EN 17 Jun 2022
Supersedes 11-AC11D1-9D-EN (February 2022)
PRESSURE CURVES (Refer below table for models)
520
INDOOR ENTERING
WET BULB CURVES
470
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
420
370
(4)
320
270
220
170
40 50 60
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
50 60 70
OUTDOOR TEMPERATURE (Degree F)
(3)
(1)
70 80 90 100
(3)
(1)
80 90 100
ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
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AHRI Certification program. For verification of individual certified
products, go to ahridirectory.org.
The manufacturer has a policy of continuous data improvement
and it reserves the right to change design and specifications with-
out notice. We are committed to using environmentally conscious
print practices.
(2)
110 120 OD Model
4A7A4060L1
71
(2)
67
63
59
110 120
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Cooling
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