Trane 4TTZ0 Installer's Manual page 29

STEP 6 - Stabilization and completion.
1. Wait 20 minutes for the system condi-
tion to stabilize between adjustments.
NOTE: When the suction temperature is in line
with the suction gage pressure, the target super-
heat value will be 15 degrees.
2. Remove gages.
3. Replace service port caps to prevent
leaks. Tighten finger tight plus an ad-
ditional 1/6 turn.
STEP 7 - Target 10–15 degrees of subcooling
using Section 14.1 as a guide.
NOTE: It is important to return in the spring or
summer to accurately charge the system in the
cooling mode with outdoor ambient above 55ºF.
STEP 8 - Verify typical performance.
Refer to System Pressure Curves in the Service
Facts to verify typical performance.
18-BC53D2-6
20 MIN.
(Example only - see Service Facts)
PRESSURE CURVES FOR 4TWX5049E1000B
4TEE3F49C1
Cooling @ 1450 SCFM
550 500
INDOOR ENTERING
(2)
WET BULB CURVES
500
TOP TO BOTTOM
450
71, 67, 63 AND 59 DEG F.
450
400
400
350
350
(4) (3)
300
300
250
250
(1)
200 200
40 60 80 100 120 -5
OUTDOOR TEMPERATURE (Degree F)
170
140
INDOOR ENTERING
165 WET BULB CURVES
130
TOP TO BOTTOM
160
120
71, 67, 63 AND 59 DEG F.
(2)
155
110
150
100
145
(5)
(3)
90
140
80
135
70
130
60
125
120 50
115
40
(1)
110
30
40 60 80 100 120
-5
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, 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 ACTUAL:
(4) DISCHARGE PRESSURE @ 1450 CFM IS 323 PSIG DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 1450 CFM IS 140 PSIG SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
GAS - 7/8" O.D.
LIQUID - 3/8" O.D.
4TEE3F49C1
Heating @ 1350 SCFM
INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
80, 70, AND 60 DEG F.
5 15 25 35 45 55 65
INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
80, 70, AND 60 DEG F.
5 15 25 35 45 55 65
DWG.NO. 4TWX5049E1
29