Bosch BRB-36HWD1N1-M18 Installation & Operation Manual page 21

Installation & Operation Manual
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 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 14
R-410A Refrigerant Chart - Final Subcooling
Heat Pump Model
BRB-36HWD1N1-M18
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).
BTC 761701311 C | 04.2020
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
12°F ± 4°F
Bosch Inverter Ducted Packaged Heat Pump 3 Ton | 21
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).
13
Figure 28
6. Stabilize the system.
195
211 Wait 5 minutes for the system condition to stabilize between

adjustments.
229
247
When the subcooling matches the chart, the system is properly
266
charged.
287
309
Remove gauges.

331
Replace service port caps to prevent leaks. Tighten finger

355
tight plus an additional 1/6 turn.
381
7. Record System Information for reference (Table16). Record system
407
pressures and temperatures after charging is complete.
435
465
The subcooling also can be calculated by pressing check button
after getting T3 and T3L temperatures (refer to table 21).
496
528
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 16
Value
°F
°F
°F
°F
°F
Data subject to change