28
Charge Adjustment
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volumetric charging device, adjust the refrigerant
charge based on the actual line set length. If the
entire system has been evacuated, add the total
calculated charge.
IMPORTANT:
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affect the optimum refrigerant charge. Charging by
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SUBCOOLING PER THE SYSTEM CHARGING
CHART MUST BE USED FOR FINAL CHARGE
ADJUSTMENT.
IMPORTANT:
R-410A is a blended
refrigerant of R-32 and R-125 (50/50). These
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and therefore change state at different pressures
and temperatures. If charge is added to the
system in the vapor state, it is possible to have a
disproportionate amount of each part of the R-410A
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operation. Therefore, it is critical to add R-410A in
the liquid form only!
5.4.3 Preliminary Charging by
Pressures
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in, run the unit for a minimum of 15 minutes
prior to noting pressures and temperatures.
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stage and that the air-handler or gas furnace is
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IMPORTANT:
Indoor conditions as
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preference.
NOTICE:
If the indoor temperature is above
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2. Note the Outdoor Dry Bulb Temperature,
ODDB° = _____°F [_____°C]. Unit charging
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conditions ONLY:
Cooling Mode ONLY: 55°F [12.8°C] outdoor dry
bulb and above
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60°F [15.6°C] outdoor dry bulb
3. Locate and note the design pressures. The
correct liquid and vapor pressures are found at
the intersection of the installed system and the
outdoor ambient temperature on the Charging
Chart located inside the access panel cover.
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= ______psig
NOTICE:
The refrigerant pressures
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These pressure values are typical, but may vary
due to application. Evaporator load (indoor coil in
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pressures to deviate. The values listed are for the
correct matched indoor coil ONLY!
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listed requirement for the given outdoor and
indoor conditions, add charge. If the measured
liquid pressure is above the listed requirement
for the given outdoor and indoor conditions,
remove charge.
5.4.4 Final Charging by Liquid
Subcooling
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pressures, find the design subcooling value.
The correct subcooling value is found at the
intersection of the installed system and the
outdoor ambient temperature on the Charging
Chart located inside the access panel cover.
SC° from Charging Chart = _____°F [_____°C].
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stage and that the air-handler or gas furnace is
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IMPORTANT:
Indoor conditions
as measured at the indoor coil are required to
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operated for at least 15 minutes prior to final
charge adjustment. Unit charging is recommended
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Cooling Mode: 55°F [12.8°C] outdoor dry bulb
and above
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[15.6°C] outdoor dry bulb
NOTICE:
Systems should not be charged
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5.0 SYSTEM START-UP & REFRIGERANT CHARGING
Charging
