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I I n n t t r r o o d d u u c c t t i i o o n n , , U U n n i i t t I I n n s s p p e e c c t t i i o o n n a a n n d d S S p p e e c c i i f f i i c c a a t t i i o o n n
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
R-410A REFRIGERANT CHARGING CHART
Refer to Service Facts or Installer's Guide for
charging method
DESIGN SUBCOOLING (°F)
LIQUID
TEMP
10
(°F)
LIQUID GAGE PRESSURE (PSI)
55
191
60
207
65
224
70
242
75
262
80
282
85
303
90
326
95
349
100
374
105
400
110
428
115
457
120
487
125
519
6
12
185
200
217
235
254
274
295
317
340
364
390
417
445
475
509
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.
N N o o t t e e : : 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.
C C H H A A R R G G I I N N G G B B E E L L O O W W 5 5 5 5 ° ° F F
Evacuate system and weigh in nameplate charge or
use factory charge. Correct subcooling may be verified
when the temperature is above 55°F.
18-EB27D1-13C-EN
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