6
18-BB41D1-1A-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.
N
No
otte
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
CH
HA
AR
RG
GIIN
NG
G B
BE
EL
LO
OW
W 5
55
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.
R-410A REFRIGERANT CHARGING CHART
Refer to Service Facts or Installer’s Guide for charging method
LIQUID
TEMP
(°F)
DESIGN SUBCOOLING (°F)
6
8
9
10
11
12
13
14
16
LIQUID GAGE PRESSURE (PSI)
55
174
179
182
185
188
191
195
198
205
60
189
195
198
201
204
208
211
215
222
65
205
211
215
218
222
225
229
232
240
70
222
229
232
236
240
243
247
251
259
75
240
247
251
255
259
263
267
271
279
80
259
267
271
275
279
283
287
291
301
85
279
287
291
296
300
304
309
313
323
90
301
309
313
318
322
327
331
336
347
95
323
331
336
341
346
351
355
360
371
100
347
355
360
365
370
376
381
386
398
105
371
381
386
391
396
402
407
413
425
110
398
407
413
418
424
429
435
441
454
115
425
435
441
446
452
458
464
470
484
120
454
464
470
476
482
488
495
501
516
125
484
495
501
507
514
520
527
533
549
From Dwg. D154557P01
C
Ch
ha
arrg
giin
ng
g B
Be
ello
ow
w 5
55
5°F
F O
OD
D A
Am
mb
biie
en
ntt iin
n H
He
ea
attiin
ng
g O
On
nlly
y
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.
