Bosch 15 SEER2 Series - Page 25

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Installation Instructions
Bosch 15 SEER2 Inverter Ducted Packaged Heat Pump - BTC 761701319 A (12.2022)
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
Ensure the temperature sampling position as shown above.
If calculated subcooling value is lower than the design
subcooling value (Table 16), please add refrigerant. Repeat
steps 2 through 4.
Liquid
Line Temp
(°F)
Final Subcooling(°F)
678910111213
Liquid Gauge Pressure (PSI)
55
173 176 179 182 185 188 191 195
60
188 191 195 198 201 204 208 211
65
204 208 211 215 218 221 225 229
70
221 225 229 232 236 239 243 247
75
239 243 247 251 255 259 262 266
80
259 262 266 270 275 279 283 287
85
279 283 287 291 295 300 304 309
90
300 304 309 313 318 322 327 331
95
322 327 331 336 341 346 351 355
100
346 351 355 360 365 370 376 381
105
370 376 381 386 391 397 402 407
110
397 402 407 413 418 424 430 435
115
424 430 435 441 447 453 459 465
120
453 459 465 471 477 483 489 496
125
483 489 469 502 508 515 521 528
Table 15 R-410A Refrigerant Chart - Final Subcooling
Heat Pump Model Design Subcooling
3 Ton and 5 Ton Model 6°F ± 2°F
Table 16
5. Adjust refrigerant level to attain proper gauge pressure.
Add 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.
Recover refrigerant if the subcooling reading from Table 15
is higher than the designed value (Table 16).
Figure 27
6. Stabilize the system.
 Wait 5 minutes for the system condition to stabilize
between adjustments.
When the subcooling matches the chart, the system is
properly charged.
 Remove gauges.
 Replace service port caps to prevent leaks. Tighten finger
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 Value
Outdoor model number
Measured Outdoor Ambient °F
Measured Indoor Ambient °F
Check Condenser Outlet Temp.(T3L) °F
Check Condenser Temp.(T3) °F
Calculate subcooling value =T3-T3L °F
Table 17