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Step 5—Charging Information
Weigh in appropriate refrigerant charge, then
use the standard practices of superheat-
charging method for piston applications and
subcooling-charging
method
applications to confirm correct charge. The
standard charging methods can be found on
outdoor
unit-information
Installation Instructions, or in the Service
Manual. Since total system charge is increased
for long-line applications, it may be necessary
to calculate the additional refrigerant charge.
Since long-line applications only involve 3/8-
in. liquid lines, the additional refrigerant
charge required is 0.6 oz of Refrigerant 22 (R-
22) per ft of 3/8-in. liquid line over 15 ft.
Table 2 —Estimated Percentage of Nominal Cooling-Capacity Losses*
UNIT NOMINAL
SIZE (BTUH)
DIAMETER (IN.)**
18,000
24,000
30,000
36,000
42,000
48,000
60,000
*The estimated percentage of cooling capacity that must be subtracted from the Detailed Cooling Capacities data specified in outdoor
unit-presale literature for any given indoor/outdoor combination.
**Vapor-line diameter that may be selected for a long-line application. If smaller vapor lines are selected but not specified within the
table, large capacity losses will occur and defrost capabilities will be reduced. If larger vapor lines are selected but not specified within
the table, refrigerant oil return will be impaired due to velocity losses.
N/R—Not recommended due to excessive loss of capacity.
Step 6—2–Speed Applications
Outdoor units may be connected to indoor
section using accessory tubing package or
field-supplied refrigerant grade tubing or
correct size and condition. In long-line
applications,
2–speed
basically the same way as the single-speed
units. There are 2 major differences:
1. For tubing up to 100 ft: Liquid tube
diameters and refrigerant connection diameters
for all sizes are 3/8 in.
18
for
TXV
plate,
in
unit
LONG-LINE
VAPOR-LINE
50
5/8
5
3/4
1
5/8
6
3/4
0
5/8
6
3/4
2
3/4
7
7/8
2
3/4
7
7/8
3
1-1/8
0
3/4
10
7/8
4
1-1/8
0
7/8
7
1-1/8
1
units
are
handled
EXAMPLE:
To calculate additional charge required for a 25–ft
line set: 25 ft – 15 ft
= 10 ft X 0.6 oz/ft = 6 oz of additional charge
The rating-plate charge of a given outdoor unit
is for a standard application of 15 ft of
interconnecting tubing. The rating-plate charge
can be found on outdoor unit-rating plate or in
outdoor
unit-presale
literature.
applications do not require additional oil
charge.
EQUIVALENT LINE LENGTH (FT)
75
100
125
7
9
12
3
4
5
9
13
16
1
1
2
8
10
13
3
4
5
10
14
17
4
6
8
10
13
17
4
6
7
0
1
1
14
18
22
6
7
9
0
1
1
9
11
14
2
2
3
Vapor tube diameter for the 036 and 048 is 7/8
in.; 060 is 1–1/8
Vapor refrigerant connection diameter for all
sizes is 7/8 in.
DO
NOT
INSTALL
INTERCONNECTING TUBING LENGTHS
GREATER THAN 100 FT.
2. Do not increase or decrease tubing sizes.
For other applications see the previous sections
under Long-Line Guidelines.
Long-line
150
175
12
14
5
7
19
22
3
4
15
17
6
7
21
NR
10
11
20
23
8
10
2
2
NR
NR
11
13
2
2
16
19
3
4
EQUIVALENT
- Quick Links:
- Base Unit Dimensions
- Physical Data
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