Napoleon Condo Pack, Installation And Operating Instructions Manual

Page: 52 / 128

52
IOM
IOM
W415-2288 / 08.29.2019
8.2 ADJUSTING SYSTEM CHARGE
Units come from the factory charged with the correct amount of refrigerant. There are times, however, when
the charge may need to be adjusted. Refrigerant leaks and addition of system components for servicing or
monitoring, for example, will require that the refrigerant charge be adjusted for the unit to function as intended.
Note that only qualified HVAC technicians shall adjust the charge.
i. If sub-cooling and superheat are low, adjust the TXV to match the sub-cooling.
ii. If sub-cooling is low and superheat is high or normal, add charge to obtain the required sub-cooling.
iii. If sub-cooling and superheat are high, adjust the TXV to match the sub-cooling.
iv. If sub-cooling is high or normal and superheat is low, remove charge to lower the required sub-cooling.
8.2.1 Procedure for using Thermostatic Expansion Valves
TABLE 9.
Condo Pack AC Section (TXV Type) Charging Chart
AC Model # Factory Charge
OD Air
Temp. DB
F
ID Air
Temp.
DB F
High
Pressure
PSIG
Low
pressure
PSIG
Sub-
cooling
F
Superheat F
A24A 49.5 OZ 95 80 386 151 7 6
Procedure:
1. Operate the unit at standard AHRI conditions as close as possible (80°F DB / 67°F WB Indoor, 95°F DB Outdoor).
2. Connect charging hose from liquid port on the refrigerant bottle to charging service port.
3.
Open refrigerant bottle and purge hose at bottle fitting.
4. Temporarily install a temperature measuring device on the liquid line near the TXV and one at the suction line
near the compressor. Ensure that the temperature measuring device makes adequate contact and insulated for
accurate readings.
5. Operate the system for at least 10 minutes.
6. Check sub-cooling and superheat. Systems using thermostatic expansion valves should have a sub-cooling
as per table below: