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Installation Instructions
Bosch IDS BOVB20 Split System Heat Pump - BTC 761701316 C (02.2022)
Design Subcooling
Model Subcooling/°F Superheat/°F
24K/36K
8-12* 10-18*
6-10 7-10
48K
6-10* 9-18*
4-8 7-9
60K
6-10* 8-18*
4-8 6-8
Table 9
* Optimized range for superheat/subcool
6. Adjust refrigerant level to attain proper gauge pressure.
Add refrigerant if the subcooling reading from Table 8 is lower
than the designed value (Table 9).
Connect gauges to refrigerant bottle and unit as illustrated (Fig. 50).
Purge all hoses.
Open tank.
Stop adding refrigerant when subcooling matches the design value (Table
9).
Recover refrigerant if the subcooling reading from Table 8 is higher
than the design value (Table 9).
Figure 50
7. Stabilize the system.
Wait 5 minutes for the system condition to stabilize between adjustments.
When the subcooling matches the design value (Table 9), the system is
properly charged.
Remove gauges.
Replace service port caps to prevent leaks. Tighten finger tight plus an
additional 1/6 turn.
8. Record System Information for reference (Table 10).
Record system pressures and temperatures after charging is complete.
Description Value
Outdoor model number
Measured Outdoor Ambient °F
Measured Indoor Ambient °F
Measured Liquid Line Temp °F
Measured Suction Line Temp °F
Liquid Gauge Pressure PSIG
Suction Gauge Pressure PSIG
Table 10
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