24
18-BC85D1-2
STEP 9 - Record System Information for refer-
ence.
Record system pressures and temperatures
after charging is complete.
Outdoor model number = _________________
Measured Outdoor Ambient = __________ º F
Measured Indoor Ambient = __________ º F
Measured Liquid Line Temp = __________ º F
The Subcooling Charging method in cooling is
not recommended below 55º F outdoor tem-
perature.
The only recommended method of charging at
outdoor temperatures below 55º F is weighing
in the charge in
heating mode.
STEP 1 - Determine additional charge.
From the nameplate label (shown in Section
12.1), record namplate charge below.
Note: The nameplate charge value represents
the amount of refrigerant shipped in the outdoor
unit and is compatible with 15 feet of AHRI rated
refrigerant lines and the smallest AHRI rated
coil.
Using Table 14.3, find the charge associated
with the additional length of tubing above 15 ft.
and record it below.
Namplate charge = ____________ Oz.
Charge adder = ______________ Oz.
(from Table 14.2)
14.3 Subcooling Charging Below 55º F Outdoor Temp. (In Heating Only)
Table 14.3
Measured Suction Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
Suction Gage Pressure = __________ PSIG
TUBING INFORMATION
LINE TYPE
REFRIGERANT TO ADD AT
SPECIFIED ADDITIONAL
LENGTH
Tonnage
Suction
Line
Liquid
Line
20 ft
30 ft
40 ft
50 ft
60 ft
1.5 – 2 Ton
5/8"
3/8"
3 oz
8 oz
14 oz 20 oz 25 oz
2.5 – 3.5 Ton
3/4"
3/8"
3 oz
9 oz
15 oz 21 oz 27 oz
4 – 5 Ton
7/8"
3/8"
3 oz
9 oz
16 oz 22 oz 28 oz
