6
18-BB34D1-19B-EN
Charging in Cooling above
55°F OD Ambient
If servicing the equipment requires system evacuation,
then re-charge the system to the weight specified on
the nameplate. Verify the system subcooling using the
Subcooling Charging Table and, if necessary, adjust
the charge using the procedure below.
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 of 20 minutes to
stabilize before accurate measurements can be
made.
3. Measure Liquid Line Temperature and Refrigerant
Pressure at service valved 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 system conditions to
stabilize before adjusting charge again.
NNoottee:: System charge shall never be more than 110% or
less than 90% of nameplate charge. If specified
subcooling cannot be achieved within those
charge bounds, contact your Field Service
Representative.
5. When system is correctly charged, you can refer to
System Pressure Curves to verify typical
performance.
CCHHAARRGGIINNGG BBEELLOOWW 5555°°FF
Evacuate system and weigh in nameplate charge or
use factory charge. Correct subcooling may be verified
when the temperature is above 55°F.
R-410A Subcooling Charging Table
Liquid
Temperature
Liquid Pressure
11°F 12°F
(ºF)
PSIG
55 188 191
60 204 207
65 221 224
70 239 242
75 258 262
80 278 282
85 299 303
90 321 326
95 345 349
100 369 374
105 395 400
110 422 428
115 451 457
120 481 487
125 512 519
CChhaarrggiinngg BBeellooww 5555°FF OODD AAmmbbiieenntt iinn HHeeaattiinngg OOnnllyy
1. The Subcool Charging Method in cooling is NOT
recommended below 55°F outdoor ambient.
2. The only recommended method of charging at
outdoor ambients below 55°F, is to weigh in the
charge in the heating mode.
3. Use Nameplate charge.
4. Check liquid line temperature and pressure (at the
OD valves) to obtain a minimum of the subcooling
shown in the subcooling table.
5. Add charge if the minimum subcooling as shown in
the table is not obtained with the nameplate charge.
6. It is important to return in the spring or summer to
accurately charge the system in the cooling mode
at outdoor ambients above 55°F.
IInnttrroodduuccttiioonn,, UUnniitt IInnssppeeccttiioonn aanndd SSppeecciiffiiccaattiioonn
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