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Refrigerant Charging Procedure
1. Determine addition refrigerant charge.
Please refer to your units installation manual for proper charge. If your lineset exceeds the chart below for your
model, additional charge may be required. The charge must we weighed in with a refrigerant charging scale.
You can only add additional refrigerant to a new installation. If a low or high charge is suspected, you must
reclaim the refrigerant, then weigh in the correct amount per specifications including any additional for long
linesets.
It is important to check for leaks before adding refrigerant.
The RIO single zone units contain a factory charge adequate for up to a total length of refrigerant line as
indicated in the chart below. Additional refrigerant will need to be added for total lengths over the listed length.
Confirm the following chart with your installation manual for additional charge amounts:
GWH09KF-
A3DNB1A
GWH12KF-
A3DNB1A
GWH09KF-
D3DNB1C
GWH12KF-
D3DNB1C
Additional Charge
0.2 oz./ft.
0.2 oz./ft.
0.2 oz./ft.
0.2 oz./ft.
Max Length without
Additional Charge
25 ft.
25 ft.
25 ft.
25 ft.
Factory Charge
35.3 oz.
35.3 oz.
26.1 oz.
35.3 oz.
Max. Total Piping
Length
49 ft.
66 ft.
50 ft.
50 ft.
Max. Elevation
33 ft.
33 ft.
33 ft.
33 ft.
GWH18KG-
D3DNB1C
GWH24KG-
D3DNB1A
Additional Charge
0.2 oz./ft.
0.22 oz./ft.
Max Length without
Additional Charge
25 ft.
25 ft.
Factory Charge
45.9 oz.
54.7 oz.
Max. Total Piping
Length
50 ft.
50 ft.
Max. Elevation
33 ft.
33 ft.
