Trane 4TTZ0 Installer's Manual page 25

STEP 5 - Adjust refrigerant level to attain
proper gage pressure.
Add refrigerant if the Liquid Gage Pressure
is lower than the chart value.
1. Connect gages to refrigerant bottle
and unit as illustrated.
2. Purge all hoses.
3. Open bottle.
4. Stop adding refrigerant when liquid
line temperature and Liquid Gage
Pressure matches the charging
chart.
Recover refrigerant if the Liquid Gage Pres-
sure is higher than the chart value.
STEP 6 - Stabilize the system.
1. Wait 20 minutes for the system condi-
tion to stabilize between adjustments.
NOTE: When the Liquid Line Temperature and
Gage Pressure approximately match the chart,
the system is properly charged.
2. Remove gages.
3. Replace service port caps to prevent
leaks. Tighten finger tight plus an ad-
ditional 1/6 turn.
STEP 7 - 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 INDOOR ENTERING
(2)
WET BULB CURVES DRY BULB CURVES
500
TOP TO BOTTOM TOP TO BOTTOM
450
71, 67, 63 AND 59 DEG F. 80, 70, AND 60 DEG F.
450
400
400
350
350
(4) (3)
300
300
250
250
(1)
200 200
40 60 80 100 120 -5 5
OUTDOOR TEMPERATURE (Degree F)
170
140
INDOOR ENTERING
INDOOR ENTERING
165 WET BULB CURVES
130 DRY BULB CURVES
TOP TO BOTTOM
160 TOP TO BOTTOM
71, 67, 63 AND 59 DEG F. 120
80, 70, AND 60 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 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
15 25 35 45 55 65
15 25 35 45 55 65
DWG.NO. 4TWX5049E1
25