18-AC108D1-1D-EN 30 Jun 2022
Supersedes 18-AC108D1-1C-EN (May 2020)
© 2022 Trane
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global climate innovator - creates comfortable,
energy efficient indoor environments for com-
mercial and residential applications. For more
information, please visit trane.com or
tranetechnologies.com.
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fied products, go to ahridirectory.org.
Trane has a policy of continuous data improvement and it reserves
the right to change design and specifications without notice. We
are committed to using environmentally conscious print practices.
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.
(3) AT INTERSECTION
ACTUAL:
(4) LIQUID PRESSURE @ 600 CFM IS 314 PSIG
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 600 CFM IS 140 PSIG
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
120
125
130
135
140
145
150
155
160
165
170
50
60
70
80
90
100
110
120
(1)
200
250
300
350
400
450
500
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
4TTA4048A3
4TTA4060A3
OD Model
1400
1600
4TTA4048A4
4TTA4060A4
1400
1600
LI
QU
ID PRESSURE (PSIG)
SU
CT
ION PRESSURE (PSIG)
59
71
67
63
