Charging The Unit - Trane 4TWV7X24A1000A Installer's Manual

Charging the Unit

Important: ENSURE INDOOR BLOWER IS CONFIGURED FOR 400 CFM/TON IN clii MODE.
Table 30. Proper Gage Pressure
Using the Standard R-410A Subcool Charging Chart, adjust refrigerant
level to attain proper gage pressure.
Add refrigerant if the Liquid Gage Pressure is lower than the chart value.
1. Connect gauges 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 match the charging chart.
Note: Recover refrigerant if the Liquid Gage Pressure is higher than the
chart value.
Table 31. Stabilize the system
5. Wait 20 minutes for the system condition to stabilize between
adjustments.
Note: When the Liquid Line Temperature and Gage Pressure
approximately match the chart, the system is properly
charged.
6. Remove gauges.
7. Replace service port caps to prevent leaks. Tighten finger tight
plus an additional 1/6 turn.
Table 32. Verify Performance
8. Refer to System Pressure Curves in the Service Facts document to
verify typical performance.
Table 33. System Information
9. Record system pressures and temperatures after charging is
complete.
Outdoor model number =
Measured Outdoor Ambient =
Measured Indoor Ambient =
Measured Liquid Line Temp =
Measured Suction Line Temp = ________________________°F
24
________________________
________________________°F
________________________°F
________________________°F
PRESSURE CURVE SAMPLE
Cooling @ 1450 SCFM
550
INDOOR ENTERING
WET BULB CURVES
500
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
450
400
350
(4) (3)
300
250
(1)
200
40 60 80 100
OUTDOOR TEMPERATURE (Degree F)
170
INDOOR ENTERING
WET BULB CURVES
165
TOP TO BOTTOM
160
71, 67, 63 AND 59 DEG F.
155
150
145
(5)
(3)
140
135
130
125
120
115
(1)
110
40 60 80 100
Indoor Wet Bulb = ________________________°F
Liquid Gage Pressure = ________________________ PSIG
Suction Gage Pressure = ________________________ PSIG
20 MIN.
Heating @ 1350 SCFM
500
INDOOR ENTERING
DRY BULB CURVES
(2)
TOP TO BOTTOM
450
80, 70, AND 60 DEG F.
400
350
300
250
200
120 -5 5 15 25 35 45 55 65
140
INDOOR ENTERING
130 DRY BULB CURVES
TOP TO BOTTOM
120
80, 70, AND 60 DEG F.
(2)
110
100
90
80
70
60
50
40
30
120
-5 5 15 25 35 45 55 65
18-BC111D1-1A-EN