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WEIGH IN
Use
remove refrigerant use either
START: Determine the correct charge method:
65ºF
(18.3ºC) and
Above
APPROACH OR
SUBCOOLING
WEIGH IN
CHARGING METHOD
CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE
If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the
unit. To calculate the total refrigerant charge:
506510−01
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to initially charge a system when the outdoor unit is void of charge. To verify charge and add or
APPROACH
TXV
64ºF
(17.7ºC) and
Below
WEIGH-IN
Figure 13. Determining Charge Method
64ºF (17.7ºC) and Below
Adjust amount. for variation
in line set length listed on
Amount specified on
line set length table below.
nameplate
+
*If line length is greater than 15 ft. (4.6 m), add this amount. If
line length is less than 15 ft. (4.6 m), subtract this amount.
NOTE
Insulate liquid line when it is routed through areas where the surrounding ambient temperature
could become higher than the temperature of the liquid line or when pressure drop is equal to or greater
than 20 psig.
NOTE
The above nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for
charge information.
Figure 14. Using HFC−410A Weigh In Method
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SUBCOOLING
or
WHEN TO CHARGE?
S
Warm weather best
S
Can charge in colder weather
CHARGE METHOD? Determine by:
S
Outdoor ambient temperature
REQUIREMENTS:
S
Sufficient heat load in structure
S
Indoor temperature between 70-80ºF (21−26ºC)
S
Manifold gauge set connected to unit
S
Thermometers:
−
to measure outdoor ambient temperature
−
to measure liquid line temperature
−
to measure suction line temperature
Total charge
=
Refrigerant Charge per Line Set Length
Ounces per 5 feet (g per 1.5 m)
Liquid Line
adjust from 15 feet (4.6 m) line set*
Set Diameter
3/8" (9.5 mm)
3 ounce per 5' (85 g per 1.5 m)
Page 28
methods.
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