•
If a portion of the liquid line passes through a hot area where liquid refrigerant
can be heated to form vapor, insulating the liquid line is required.
•
Use clean, dehydrated, sealed refrigeration grade tubing.
•
Always keep tubing sealed until tubing is in place and connections are to be
made.
•
Blow out the liquid and vapor lines with dry nitrogen before connecting to the
outdoor unit and indoor coil. For an air conditioning system, any debris in the
line set could end up plugging the expansion device.
•
If tubing has been cut, make sure ends are deburred while holding in a position
to prevent chips from falling into tubing. Burrs such as those caused by tubing
cutters can affect performance dramatically, particularly on small liquid line
sizes.
•
For best operation, keep tubing run as short as possible with a minimum num-
ber of elbows or bends.
•
Locations where the tubing will be exposed to mechanical damage should be
avoided. If it is necessary to use such locations, the copper tubing should be
housed to prevent damage.
•
If tubing is to be run underground, it must be run in a sealed watertight chase.
•
Use care in routing tubing and do not kink or twist. Use a tubing bender on the
vapor line to prevent kinking.
•
The vapor line must be insulated to prevent dripping (sweating) and prevent
performance losses. Armaflex and Rubatex are satisfactory insulations for this
purpose. Use 1/2” minimum insulation thickness, additional insulation may be
required for long runs.
•
Check Table 2 for the correct vapor line size. Check Tables 4 and 5 for the cor-
rect liquid line size.
9.6 TUBING CONNECTIONS
Indoor evaporator coils have only a holding charge of dry nitrogen. Keep all tube
ends sealed until connections are to be made.
•
Use type “L” copper refrigeration tubing. Braze the connections with accepted
industry practices.
•
Be certain both refrigerant service valves at the outdoor unit are closed.
12
Unit Size
Suction Line
Connection Size
TABLE 2
SUCTION LINE LENGTH/SIZE VS. CAPACITY MULTIPLIER (R-410A)
1
1
⁄
2
Ton
2 Ton
2
1
⁄
2
Ton
3 Ton
3
1
⁄
2
Ton
4 Ton
5 Ton
3/4" I.D.
3/4" I.D.
3/4" I.D.
7/8" I.D.
7/8" I.D.
7/8" I.D.
7/8" I.D.
Suction Line
Run - Feet
5/8
3/4*
---
Optional
Standard
Optional
Optional
Standard
Optional
Optional
Standard
Optional
Optional
Standard
Optional
25’
50’
100’
150’
5/8
3/4*
3/4*
---
7/8
5/8
3/4*
7/8
---
3/4
7/8*
---
7/8*
1 1/8
---
7/8*
---
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
---
---
1.00
---
---
---
---
0.98
0.98
0.96
0.98
0.99
0.99
0.99
0.99
0.99
0.98
0.99
0.99
0.99
0.99
---
---
0.99
---
---
---
---
0.95
0.95
0.94
0.96
0.96
0.96
0.97
0.96
0.96
0.96
0.97
0.98
0.98
0.98
---
---
0.97
---
---
---
---
0.92
0.92
0.91
0.94
0.94
0.95
0.94
0.93
0.94
0.93
0.95
0.96
0.96
0.97
---
---
0.95
---
---
---
---
NOTES:
*Standard Line Size
Using suction line larger than shown in chart will result in poor oil return and is not recommended.
1 1/8
!
CAUTION
The filter drier is located inside the control box. The filter drier must be
installed externally in the liquid line or the Warranty will be VOID!
