53 PB
INSTALLATION
Outdoor Units
Additional Refrigerant Charge
Although refrigerant has been charged into this unit, additional refrigerant charge may be required according to the piping length.
The additional refrigerant precharge quantity should be determined and charged into the system according to the following
procedure.
For configurations containing a mix of 7‑18k indoor units:
1. Determine the Length of 1/4” Liquid line set used in the Installation (L).
2. Use table 433.1 to determine how much additional refrigerant is required.
For configurations includng 24k units
1. Determine the Length of 1/4” Liquid line set used in the Installation. (L1)
2. Determine the Length of 3/8” Liquid line set used in the Installation. (L2)
3. Use table 433.1 to determine how much additional refrigerant is required.
X is the additonal refrigerant required for servicing according to the installation piping length.
If X is less than zero, no additional refrigerant is required.
Record the additional refrigerant quantity in order to facilate future maintenance and servicing activities.
Outdoor
Unit
Indoor Unit
Configuration
Pre‑Charged
Refigerant weight
before shipping
(CF) Correction
Factor for 3/8 line
set (Only used with
24k indoor units)
(P) pre‑charged 1/4”
line set length
Additional refrigerant charge
required (in ounces)
18k 7k‑18k 63.49 oz. N/A 50 X = (L‑P) * .16
24k 7k‑18k 81.13 oz N/A 75 X = (L‑P) * .16
36k 7k‑18k 105.82 oz N/A 100 X = (L‑P) * .16
7k‑24k 105.82 oz 15.68 100 X = (L1 * .16) +(L2 *.38) ‑ CF
42k 7k‑18k 120 oz N/A 125 X = (L‑P) * .16
7k‑24k 120 oz 20 125 X = (L1 * .16) +(L2 *.38) ‑ CF
Table 433.1 ( Determining Additional Required Refrigerant)
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