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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
12 System Charge Adjustment
The unit comes precharged from the factory with 12-9 lb-oz of
refrigerant. Please measure superheat and subcooling, and add or
remove refrigerant accordingly.
12.1 Charging: Weigh-In Method
Weigh-in method is recommended for the initial installation, or anytime a system
charge is being replaced. Weigh-in method can also be used when power is
not available to the equipment site or operating conditions (indoor/outdoor
temperatures) are not in range to verify with the subcooling charging method.
Heat Pump Model Refrigerant Charge (lb-oz)
BRBA-60HWD1N1-M18 12-9
Table 10
12.2 Subcooling Charging and Refrigerant Adjustment In Cooling
(Above 55°F Outdoor Temp.)
1. Check the outdoor ambient temperatures.
Subcooling (in cooling mode) is the only recommended method of
charging above 55°F outdoor ambient temperatures. For outdoor ambient
temperatures below 55°F , use weigh-in charge method.
It is important to return in the spring or summer to accurately
charge the system in the cooling mode when outdoor ambient
temperature is above 55°F.
Figure 22
55ºF
Outdoor Temp1
120ºF
Outdoor
Temperature
Above 55ºF
55ºF
Outdoor Temp2
Outdoor
Temperature
Below 55ºF
For best results the indoor temperature should be kept between 70°F to 80°F.
Figure 23
80 ºF
70ºF
Indoor Temp
2. Stabilize the system.
3. After starting the system in cooling mode, short press “FORCE” button,
and a “ |— ” symbol should appear. System may take 10 minutes to ramp up.
Operate the system for a minimum of twenty (20) minutes.
Figure 24
SW2
FORCE
After a twenty (20) minute stabilization period operating at
100% capacity (60 Hertz ), maintain continuous operation while
adjusting refrigerant charge. After adjusting, operate system for a
minimum of fi ve (5) minutes for system to stabilize, otherwise repeat
step 3.
Figure 25
20 MIN.
4. Calculate subcooling value on liquid line (According to Table 11)
Measured Liquid Line Temp. = ________ºF
Measured Liquid Line Pressure = _______ PSIG
Calculate subcooling value = ________ºF
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