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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703103 A (11.2022)
Figure 27
Ensure the temperature sampling position as shown above.
If calculated subcooling value is lower than the design
subcooling value (Table 15), 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 14 R-410A Refrigerant Chart - Final Subcooling
Heat Pump Model Design Subcooling
BRB-36HWD1N1-M18 12°F ± 4°F
Table 15
5. Adjust refrigerant level to attain proper gauge pressure.
Add refrigerant if the subcooling reading from Table 14 is
lower than the designed value (Table 15).
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 14) Final Subcooling value.
Recover refrigerant if the subcooling reading from Table 14 is higher
than the designed value (Table 15).
Figure 28
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 16
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