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# 41718L098
For installations exceeding 100 feet, contact the Armstrong Air Conditioning Inc.
Technical Services Department at (419) 483-4840.
Factory charge contains refrigerant for condenser, evapo-
rator and 20 feet of 3/8” line set. For line set other than 20
feet, adjust charge at 0.60 oz. per foot of 3/8” o.d. liquid
line and 1.2 oz. per foot of 1/2”. To obtain optimum
performance, system charge should be weighed in
accordance to amount specified on unit rating plate and
any adjustments for additional line length over 20 feet, as
stated above.
System performance may be verified by using the
refrigerant charging labels provided with each unit.
In air conditioning systems, horizontal suction lines should
be slightly sloped toward the condensing unit. Piping must
avoid dips or low spots can collect oil. To aid in the return
of oil, a trap should be installed at the bottom of any
suction riser. The top end of the riser must be pitched
toward the compressor. For long vertical risers, additional
traps are recommended for each additional 20 feet of pipe
to insure proper oil movement.
A crankcase heater is recommended for applications
where additional field added charge results in a system
with a reciprocating compressor requiring more than 6 lbs.
of refrigerant or a scroll compressor requiring more than
10 lbs. of refrigerant.
Liquid Line Sizes
Table 3
0
0
0
,
2
1
8
/
3
8
/
3
8
/
3
8
/
3
8
/
3
0
0
0
,
8
1
8
/
3
8
/
3
8
/
3
8
/
3
8
/
3
0
0
0
,
4
2
8
/
3
8
/
3
8
/
3
8
/
3
8
/
3
0
0
0
,
0
3
8
/
3
8
/
3
8
/
3
8
/
3
2
/
1
0
0
0
,
6
3
8
/
3
8
/
3
8
/
3
8
/
3
2
/
1
0
0
0
,
2
4
8
/
3
8
/
3
8
/
3
2
/
1
2
/
1
0
0
0
,
8
4
8
/
3
8
/
3
8
/
3
2
/
1
2
/
1
0
0
0
,
0
6
8
/
3
8
/
3
8
/
3
2
/
1
2
/
1
BTU/HR
12 FT.
25 FT.
50 FT.
75 FT.
100 FT.
LINE SET LENGTH AND SIZE
Suction Line Sizes
Table 2
0
0
0
,
2
1
4
/
3
4
/
3
4
/
3
4
/
3
4
/
3
0
0
0
,
8
1
4
/
3
4
/
3
4
/
3
4
/
3
4
/
3
0
0
0
,
4
2
4
/
3
4
/
3
4
/
3
4
/
3
8
/
7
0
0
0
,
0
3
4
/
3
4
/
3
4
/
3
8
/
7
8
/
7
0
0
0
,
6
3
8
/
7
8
/
7
8
/
7
8
/
7
8
/
1
1
0
0
0
,
2
4
8
/
7
8
/
7
8
/
7
8
/
1
1
8
/
1
1
0
0
0
,
8
4
8
/
7
8
/
7
8
/
7
8
/
1
1
8
/
1
1
0
0
0
,
0
6
8
/
7
8
/
7
8
/
7
8
/
1
1
8
/
1
1
BTU/HR
12 FT.
25 FT.
50 FT.
75 FT.
100 FT.
LINE SET LENGTH AND SIZE
