Armstrong Air Conditioning 4SCU13LE Series Installation And Maintenance Instructions Manual - Page 4
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4. Install low voltage wiring from outdoor to indoor unit and
from thermostat to indoor unit (see Figure 5).
Thermostat Designations
Thermostat
Indoor Unit
Power
R
Heat
W1
Cooling
Y
Indoor Blower
G
C
See unit wiring diagram for power supply connections.
If the indoor unit is not equipped with a blower relay,
one must be field supplied and installed.
Do not connect C (common) connection between
indoor unit and thermostat except when required by
the indoor thermostat. Refer to thermostat installation
instructions. C (common) connection between indoor
unit and outdoor unit required for proper operation.
Figure 5
5. Do not bundle any excess 24V control wire inside control
box. Run control wire through installed wire tie and tighten
wire tie to provide low voltage strain relief and to maintain
separation of field-installed low and high voltage circuits.
Refrigerant Piping
If the 4SCU13LE unit is being installed with a new indoor
coil and line set, the refrigerant connections should be
made as outlined in this section. If an existing line set and/
or indoor coil will be used to complete the system, refer to
this section as well as the section that follows entitled
Flushing Existing Line Set and Indoor Coil.
If this unit is being matched with an approved line set or
indoor coil which was previously charged with R22 refriger-
ant, the line set and coil must be flushed prior to installation.
If the unit is being used with an existing indoor coil which was
equipped with a liquid line which served as a metering device
(RFCI), the liquid line must be replaced prior to the installa-
tion of the 4SCU13LE unit.
Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (sweat connections) to the indoor
coil (flare or sweat connections).
Select line set diameters from Table 2 to ensure that oil
returns to the compressor. Size vertical suction riser to
maintain minimum velocity at minimum capacity. Recom-
mended line length is 50' or less. If more than 50' line set
is required, contact Technical Services at (419) 483-4840.
Page 4
Outdoor
R
Unit
W
Y1 Outdoor Unit
Y
G
C Outdoor Unit
C
Table 2 shows the diameters for line sets up to 100'
although vertical lift applications and trapping require-
ments need to be reviewed with Technical Services for
line sets over 50'.
Refrigerant Line Set Diameters (in.)
L
q i
L
n i
e
S
B
T
U
H
2 1
. t f
2
5
1
8
0 ,
0
0
3
8 /
3
8 /
2
4
0 ,
0
0
3
8 /
3
8 /
3
0
0 ,
0
0
3
8 /
3
8 /
3
6
0 ,
0
0
3
8 /
3
8 /
4
2
0 ,
0
0
3
8 /
3
8 /
4
8
0 ,
0
0
3
8 /
3
8 /
6
0
0 ,
0
0
3
8 /
3
8 /
S
u
t c
L
n i
e
S
B
T
U
H
2 1
. t f
2
5
1
8
0 ,
0
0
3
4 /
3
4 /
2
4
0 ,
0
0
3
4 /
3
4 /
3
0
0 ,
0
0
3
4 /
3
4 /
3
6
0 ,
0
0
7
8 /
7
8 /
4
2
0 ,
0
0
7
8 /
7
8 /
4
8
0 ,
0
0
7
8 /
7
8 /
6
0
0 ,
0
0
1
1 -
8 /
1
1 -
For installations exceeding 50', contact
Technical Services at (419) 483-4840.
Table 2
Installing Refrigerant Line
During the installation of an air conditioning system, it is
important to properly isolate the refrigerant line to prevent
unnecessary vibration. Line set contact with the structure
(wall, ceiling, or floor) may cause objectionable noise
when vibration is translated into sound. As a result, more
energy or vibration can be expected. Close attention to
line set isolation must be observed. If refrigeration lines
are routed through a wall, seal and isolate the opening so
vibration is not transmitted to the building.
u
d i
L
n i
e
t e
L
e
n
g
h t
a
n
d
S
z i
e
. t f
5
0
. t f
7
5
. t f
0 1
0
. t f
3
8 /
3
8 /
3
8 /
3
8 /
3
8 /
3
8 /
3
8 /
3
8 /
1
2 /
3
8 /
3
8 /
1
2 /
3
8 /
1
2 /
1
2 /
3
8 /
1
2 /
1
2 /
3
8 /
1
2 /
1
2 /
o i
n
L
n i
e
t e
L
e
n
g
h t
a
n
d
S
z i
e
. t f
5
0
. t f
7
5
. t f
0 1
0
. t f
3
4 /
3
4 /
3
4 /
3
4 /
3
4 /
7
8 /
3
4 /
7
8 /
7
8 /
7
8 /
7
8 /
1
1 -
8 /
7
8 /
1
1 -
8 /
1
1 -
8 /
7
8 /
1
1 -
8 /
1
1 -
8 /
8 /
1
1 -
8 /
1
1 -
8 /
1
1 -
8 /
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