Lennox International Inc. 10ACB - Manual (Page 4)

3DJH 
PLUMBING
Field refrigerant piping consists of liquid and suction
lines from the condensing unit (sweat connections) to
the indoor evaporator coil (flare or sweat connections).
Use Lennox L10 (flare) or L15 (sweat, non-flare) series
line sets as shown in table 1 or use field-fabricated re-
frigerant lines. Refer to unit information manual piping
section for proper size, type and application of field--
fabricated lines.
Sweat Connection Procedure
1-- Ends of refrigerant lines must be cut square, free
from nicks or dents, deburred. Pipe must remain
round, do not pinch end of line.
2-- Wrap a wet cloth around the liquid line valve body
and copper tube stub to protect from heat damage
during brazing. Wrap another wet cloth underneath
the liquid valve to protect the base paint.
3-- Quench the joints with a wet cloth to prevent possible
heat damage to the valve core and opening port.
4-- A field provided filter drier should be installed as
close as possible to the expansion device.
REFRIGERANT METERING DEVICE
10ACB units are applicable to either RFCIV or an expan-
sion valve system. See indoor coil installation instruc-
tions and the Lennox engineering handbook for ap-
proved RFC and TXV match-ups and application
information. Table 1 lists 10ACB unit liquid and suction
line sizes and corresponding line sets.
TABLE 1
REFRIGERANT LINE KITS
UNIT
LIQUID
LINE
SUCTION
LINE
L10
LINE SETS
10ACB24
10ACB30
10ACB42
3/8 in
(10 mm)
3/4 in.
(19 mm)
L10--41
20 ft. -- 50 ft.
(6 m -- 15 m)
10ACB18 5/16 in*
(8 mm)
3/8 in
(10 mm)
L10--65
30 ft. -- 50 ft.
(9 m -- 15 m)
L10--21
20 ft. -- 50 ft.
(6 m -- 15 m)
5/8 in
(16 mm)
7/8 in.
(22 mm) 10ACB48
3/8 in
(10 mm)
1--1/8 in.
(29 mm)
FIELD
FABRICATED
10ACB60
*Use reducer supplied in bag assembly.
L15
LINE SETS
L15--41
20 ft. -- 50 ft.
(6 m -- 15 m)
L15--65
30 ft. -- 50 ft.
(9 m -- 15 m)
L15--21
20 ft. -- 50 ft.
(6 m -- 15 m)
FIELD
FABRICATED
10ACB36
10ACB62
NOTE -- Line length should be no greater than 50 feet
(15.2 m). Select line set diameters from table 1 to en-
sure oil return to compressor.
RFC Systems
10ACB units are shipped with an RFCIV metering de-
vice. Replace existing RFCIV in indoor unit with RFCIV
supplied with the outdoor unit. Place the supplied
RFCIV sticker on indoor cabinet after installation. See
table 2 for size of RFCIV bullet shipped in each 10ACB
unit. In cases of non-traditional applications, RFCIV
bullet shipped may not be appropriate. Refer to the in-
door coil installation instructions and the engineering
handbook for specific orifice information.
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10ACB UNIT RFCIV PART # RFCIV DRILL SIZE
10ACB12 42J35 0.047
10ACB18 42J39 0.055
10ACB24 66J87 0.062
10ACB30 42J45 0.067
10ACB36 42J48 0.073
10ACB42 42J52 0.080
10ACB48 42J54 0.084
10ACB60 42J58 0.092
RFCIV bullet is installed as shown in figure 3. Take care
not to twist cap tubes when loosening seal nut from
orifice body.
4.CIV INSTALLATION
DISTRIBUTOR
“BULLET”
ORIFICE
ORIFICE
BODY
SEAL
NUT
FIGURE 3
SWEAT
CONNECTION