Bosch IDS BOVA20 - Page 23

Installation Instructions
Bosch IDS BOVA20 & BOVC20 Split System Heat Pump - BTC 761703107 A (12.2023)
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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. 41).
• 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 42
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