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Installation Instructions
Bosch 15 SEER2 Inverter Ducted Packaged Heat Pump - BTC 761701319 A (12.2022)
12 System Charge Adjustment
Units come precharged from the factory, 3 Ton units with 4-6
lb-oz and 5 Ton units with 6-10 lb-oz. Follow Section 12 for
charge adjustments i.e if components have been replaced, or if
there is a suspected leak.
12.1 Charging: Weigh-In Method
Weigh-in method is recommended 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)
3 Ton Model 4-6
5 Ton Model 6-10
Table 14
12.2 Subcooling Cha r ging an d Refrigerant Adjustm e nt 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 23
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 24
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 25
SW1
FORCE
After a twenty (20) minute stabilization period operating at 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 26
20 MIN.
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