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Installation Instructions
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
3 Ton Model
5 Ton Model
Table 14
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.
Outdoor
Temperature
Above 55ºF
120ºF
55ºF
Outdoor Temp1
Figure 23
2 4 |
Refrigerant Charge (lb-oz)
4-6
6-10
Outdoor
Temperature
Below 55ºF
55ºF
Outdoor Temp2
Bosch 15 SEER2 Inverter Ducted Packaged Heat Pump - BTC 761701319 A (12.2022)
For best results the indoor temperature should be kept between 70°F to
80°F.
80 ºF
70ºF
Indoor Temp
Figure 24
2.
Stabilize the system.
After starting the system in cooling mode, short press "FORCE"
3.
button, and a " | — " symbol should appear. System may take 10
minutes to ramp up. Operate the system for a minimum of twenty
(20) minutes.
SW1
FORCE
Figure 25
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.
20 MIN.
Figure 26
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Troubleshooting
