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U U n n i i t t S S t t a a r r t t u u p p
Pressure Curves
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 @ 1195 CFM CFM IS 331 PSIG
(5) SUCTION PRESSURE @ 1195 CFM CFM IS 146 PSIG
28
Figure 9. Pressure Curve – 4YCY4036
Cooling with Thermal Expansion Valve
500
INDOOR ENTERING WET
BULB CURVES
450
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
400
350
(4)
300
250
200
40
50
60
OUTDOOR TEMPERATURE (Degree F)
INDOOR ENTERING WET
170
BULB CURVES
165
TOP TO BOTTOM
160
71, 67, 63 AND 59 DEG F.
155
150
(5)
145
140
135
130
125
120
115
110
105
100
40
50
60
OUTDOOR TEMPERATURE (Degree F)
(3)
(1)
70
80
90
100
(3)
(1)
70
80
90
100
ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
(2)
110
120
(2)
110
120
DWG.NO. 4YCY4036
18-EB27D1-13C-EN
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