Section 19. Pressure Curves - Trane 4TWR6 Series Installation And Operation Manual

Section 19. 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, DISCHARGE 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 DISCHARGE OR SUCTION PRESSURE IN LEFT
COLUMN (4).
EXAMPLE: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION
(4) DISCHARGE PRESSURE @ 740 CFM IS 291 PSIG.
(5) SUCTION PRESSURE @ 740 CFM IS 154 PSIG.
Cooling with Thermal Expansion Valve
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
500 50 0
2ND STAGE
450 45 5
40 400 0
35 350 5
300 30 0
25 250 5
200 20 0
40 60 80
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
180 18
2ND STAGE
170 17 70
16 160 60
150 15 50
140 14 40
130 13 30
120 12
40 60 80
18-AC104D1-1G-EN
PRESSURE CURVES FOR 4TWR6024N1
TAM7A0B30H21
71, 67, 63 AND 59 DEG F.
500
1ST STAGE
450
400
350
300 (4) (3)
250
(1)
200
100 120 40 60 80
OUTDOOR TEMPERATURE (Degree F)
180
71, 67, 63 AND 59 DEG F.
1ST STAGE
170
160
(5)
150 (3)
140
130
(1)
120
100 120
40 60 80
OUTDOOR TEMPERATURE (Degree F)
ACTUAL:
DISCHARGE PRESSURE SHOULD BE +/- 10 PSIG OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
Heating with Thermal Expansion Valve
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
500
(2)
2ND STAGE
450
400
350
300
250
200
100 120
-5 5 15 25 35 45 55 65
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
150
140
2ND STAGE
130
(2)
120
110
100
90
80
70
60
50
40
100 120
-5 5 15 25 35 45 55 65
TAM7A0B30H21
80, 70, AND 60 DEG F.
500
1ST STAGE
450
400
350
300
250
200
-5 5 15 25 35 45 55 65
150
80, 70, AND 60 DEG F.
140
1ST STAGE
130
120
110
100
90
80
70
60
50
40
-5 5 15 25 35 45 55 65
25