8
Service Facts
CHARGING IN COOLING ABOVE 55°F OD
AMBIENT
The preferred method is to weigh in the factory charge
per the unit nameplate. If weighing in the charge is not
practical, the following method can be used. The fol-
lowing charging method is prescribed for systems with
indoor TXVs.
1. For best results – the indoor temperature should be kept
between 70°F to 80°F. Add system heat if needed.
2. Whenever charge is removed or added, the system must
be operated for a minimum 20 minutes to stabilize before
accurate measurements can be made.
3. Measure Liquid Line Temperature and Refrigerant Pres-
sure at service valves in the compressor compartment.
4. Locate your liquid line temperature in the left column of
the table, and the intersecting liquid line pressure under
the subcool value column. Add refrigerant to raise the
pressure to match the table, or remove refrigerant to
lower the pressure. Again, wait 20 minutes for the sys-
tem conditions to stabilize before adjusting charge again.
5. When system is correctly charged, you can refer to
System Pressure Curves (on page 2) to verify typical
performance.
R-410A Subcooling Charging Table
10 (ºF) Subcooling
Liquid
Liquid
Temperature
Pressure
(ºF)
PSIG
55
185
60
200
65
217
70
235
75
254
80
274
85
295
90
317
95
340
100
364
105
390
110
417
115
445
120
475
125
506
Summary of Contents for 4YCY4036B-SF-1H
Page 9: ...9 Service Facts...
Page 12: ...Trane 6200 Troup Highway Tyler TX 75707 01 13...
