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WHEN TO CHARGE?
Warm weather best
Can charge in colder weather
CHARGE METHOD? Determine by:
Metering device type
Outdoor ambient temperature
REQUIREMENTS:
Sufficient heat load in structure
Indoor temperature between 70-80ºF (21−26ºC)
Manifold gauge set connected to unit
Thermometers:
− to measure outdoor ambient temperature
− to measure liquid line temperature
− to measure suction line temperature
APPROACH OR
SUBCOOLING
WEIGH-IN
64ºF (17.7ºC)
AND BELOW
65ºF (18.3ºC)
AND ABOVE
START: Determine how refrigerant is metered
TXV
Figure 19. Determining Charge Method
OUTDOOR AMBIENT
TEMPERATURE
START: Measure outdoor ambient temperature
64ºF
(17.7ºC) and
BELOW
1. Check Liquid and suction line pressures
2. Compare unit pressures with Table 5 or 6.
3. Conduct leak check; evacuate as
previously outlined.
4. Weigh in the unit nameplate charge plus
any charge required for line set differences
over feet.
Liquid Line
Set Diameter
g per 1.5 m) adjust from 4.6 m line
set*
9.5 mm
85 g per 1.5 m)
NOTE − *If line length is greater than 4.6 m, add this amount. If
line length is less than 4.6 m, subtract this amount.
Refrigerant Charge per Line Set Length
USE SUBCOOLING
METHOD
This nameplate is for illustration purposes
only. Go to actual nameplate on outdoor
unit for charge information.
ABOVE or
BELOW
WEIGH IN TXV
Figure 20. HFC−410A Weigh In
65ºF
(18.3ºC)
and
ABOVE
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