FIRST STAGE SECOND STAGE
1120 SCFM 1540 SCFM
LIQUID PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
SUCTION PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
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 EXAMPLE: SECOND STAGE
(1) OUTDOOR TEMP. 82 F. (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F. (2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION (3) AT INTERSECTION
(4) LIQUID PRESSURE @ 1120 CFM IS 304 PSIG (4) LIQUID PRESSURE @ 1540 CFM IS 336 PSIG
(5) SUCTION PRESSURE @ 1120 CFM IS 147 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
DWG.NO. 4YCZ6060
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40 50 60 70 80 90 100 110 120
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(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM 71,
67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM 71,
67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM 71,
67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM 71,
67, 63 AND 59 DEG F.
(2)
(1)
(4)
(3)
(2)
(1)
(3)
(5)
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