Trane 4TTX7, Installation And Operation Manual, Page: 31 / 34

18-AC125D1-1A-EN 31
Section 18. Pressure Curves
PRESSURE CURVES FOR 4TTX7024E1
FIRST STAGE SECOND STAGE
TAM7A0B30H21 TAM7A0B30H21
Cooling with Thermal Expansion Valve Cooling with Thermal Expansion Valve
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 @ 600 CFM IS 295 PSIG (4) LIQUID PRESSURE @ 810 CFM IS 280 PSIG
(5) SUCTION PRESSURE @ 600 CFM IS 145 PSIG (5) SUCTION PRESSURE @ 810 CFM IS 150 PSIG
ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
INTERCONNECTING LINES
GAS - 3/4" O.D.
LIQUID - 3/8" O.D.
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
DWG.NO. 4TTX7024E1
120
130
140
150
160
170
40 50 60 70 80 90 100 110 120
120
130
140
150
160
170
40 50 60 70 80 90 100 110 120
150
200
250
300
350
400
450
500
40 50 60 70 80 90 100 110 120
150
200
250
300
350
400
450
500
40 50 60 70 80 90 100 110 120
(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)