Bosch 15 SEER2 Series Installation Instructions Manual page 25

4. Calculate subcooling value on liquid line (According to Table 15)

Measured Liquid Line Temp. = ________ºF

Measured Liquid Line Pressure = _______ PSIG

Calculate subcooling value = ________ºF
E nsure the temperature sampling position as shown above.
I f calculated subcooling value is lower than the design
subcooling value (Table 16), please add refrigerant. Repeat
steps 2 through 4.
Liquid
Line Temp 6 7 8
(°F)
Liquid Gauge Pressure (PSI)
55
173 176 179
60
188 191 195
65
204 208 211
70
221 225 229
75
239 243 247
80
259 262 266
85
279 283 287
90
300 304 309
95
322 327 331
100
346 351 355
105
370 376 381
110
397 402 407
115
424 430 435
120
453 459 465
125
483 489 469
Table 15
R-410A Refrigerant Chart - Final Subcooling
Heat Pump Model
3 Ton and 5 Ton Model
Table 16
5. Adjust refrigerant level to attain proper gauge pressure.
A dd refrigerant if the subcooling reading from Table 15 is
lower than the designed value (Table 16).

Connect gauges to refrigerant bottle and unit as illustrated
(Figure 27 and 28).

Purge all hoses.

Open tank.

Stop adding refrigerant when subcooling matches the
charging chart (Table 15) Final Subcooling value.
Bosch 15 SEER2 Inverter Ducted Packaged Heat Pump - BTC 761701319 A (12.2022)
Final Subcooling(°F)
9 10 11 12
182 185 188 191
198 201 204 208
215 218 221 225
232 236 239 243
251 255 259 262
270 275 279 283
291 295 300 304
313 318 322 327
336 341 346 351
360 365 370 376
386 391 397 402
413 418 424 430
441 447 453 459
471 477 483 489
502 508 515 521
Design Subcooling
6°F ± 2°F
R ecover refrigerant if the subcooling reading from Table 15
is higher than the designed value (Table 16).
13
195
211
229
Figure 27
247
266
6. Stabilize the system.
287
309

Wait 5 minutes for the system condition to stabilize
between adjustments.
331
355
381
When the subcooling matches the chart, the system is
properly charged.
407
435
465

Remove gauges.
496

Replace service port caps to prevent leaks. Tighten finger
528 tight plus an additional 1/6 turn.
7. Record System Information for reference (Table16). Record system
pressures and temperatures after charging is complete.
The subcooling also can be calculated by pressing check
button after getting T3 and T3L temperatures (refer to table
21).
Description
Outdoor model number
Measured Outdoor Ambient
Measured Indoor Ambient
Check Condenser Outlet Temp.(T3L)
Check Condenser Temp.(T3)
Calculate subcooling value =T3 - T3L
Table 17
Installation Instructions
Value
°F
°F
°F
°F
°F
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