Section 18. Pressure Curves - Trane 4TTR4018N Installation And Operation Manual

Section 18. 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 @ 600 CFM IS 305 PSIG
(5) SUCTION PRESSURE @ 600 CFM IS 141 PSIG
520
INDOOR ENTERING
WET BULB CURVES
470
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
420
370
(4)
320
270
220
170
50 60 70
OUTDOOR TEMPERATURE (Degree F)
520
INDOOR ENTERING
WET BULB CURVES
470
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
420
370
320
(4)
270
220
170
50 60 70
OUTDOOR TEMPERATURE (Degree F)
20
PRESSURE CURVES (Refer below table for models)
(3)
(1)
80 90 100 110
PRESSURE CURVES (Refer below table for models)
(3)
(1)
80 90 100 110
ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
170
INDOOR ENTERING
(2)
165
WET BULB CURVES
TOP TO BOTTOM
160
71, 67, 63 AND 59 DEG F.
155
150
145
(5)
140
135
130
125
120
120
50 60
OUTDOOR TEMPERATURE (Degree F)
170
INDOOR ENTERING
165
WET BULB CURVES
TOP TO BOTTOM
(2)
160
71, 67, 63 AND 59 DEG F.
155
150
(5)
145
140
135
130
125
120
50 60
OUTDOOR TEMPERATURE (Degree F)
(3)
(1)
70 80 90 100
OD Model
4TTR4018N1
(3)
(1)
70 80 90 100
OD Model
4TTR4019N1
18-AC51D1-10F-EN
71
(2)
67
63
59
110 120
Cooling
@SCFM
800
71
(2)
67
63
59
110 120
Cooling
@SCFM
600