REFRIGERANT CONNECTIONS
DISTANCES BETWEEN UNITS
To locate the outdoor and the indoor units, refer to the following information.
L: Distance length between both units. 1 = Refrigerant vapour line.
2 = Liquid aspiration line.
OUTDOOR U.
INDOOR U.
2
L
2
1
L
INDOOR UNIT 
OUTDOOR U.
OUTDOOR U.
1
1
2
L
INDOOR U.
MODEL |
| 2,8 | 3 | 4 | 5 |
|
|
|
|
|
|
Tube size | Liquid | 3/8" | 3/8" | 3/8"(1) | 1/2" |
| Vapour | 5/8"(1) | 3/4" | 3/4" | 3/4" |
|
|
|
|
|
|
Refrigerant lines sizes | Máx.Vertical | 15 | 15 | 15 | 15 |
Refrigerant lines sizes L | Total vertical | 20 | 25 | 20 | 20 |
+ | |||||
| Horizontal |
|
|
|
|
Max. number of bends |
| 8 | 12 | 8 | 8 |
If the height length is greater than 5 meters, a siphon suction must be installed on the suction line every 5 meters to ensure that oil return to the compressor.
(1) Use the coupling fittings included in indoor unit for refrigerant connection with outdoor unit..
NOTE: THE REFRIGERANT LINES GAS AND LIQUID, MUST BE INSULATED
For other positions and longer lengths, consult the Lennox Technical Support Department for application
assistance.
The following data will be obtained from that estimation:
Pipe dimensions, Siphon suction, Insulation, Refrigerant charge
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