30
18-BC98D1-1G-EN
Pressure Curves
PRESSURE CURVES (Refer below table for models)
OUTDOOR TEMPERATURE (Degree F)
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: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(4) LIQUID PRESSURE @ 600 CFM IS 306 PSIG LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 600 CFM IS 143 PSIG SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
125
130
135
140
145
150
155
160
165
170
50 60 70 80 90 100 110 120
(1)
190
240
290
340
390
440
490
50 60 70 80 90 100 110 120
(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.
Cooling
@SCFM
4TTL6018A1
4TTL6024A1
OD Model
650
800
4TTL6030A1
950
59
71
67
63
LIQUID PRESSURE (PSIG)
SUCTION PRESSURE (PSIG)