It will be necessary to evacuate the system to 350 microns or less. If a leak is
suspected, leak test with dry nitrogen to locate the leak. Repair the leak and test again.
To verify that the system has no leaks, simply close the valve to the vacuum pump
suction to isolate the pump and hold the system under vacuum. Watch the micron
gauge for a few minutes. If the micron gauge indicates a steady and continuous rise,
it's an indication of a leak. If the gauge shows a rise, then levels off after a few minutes
and remains fairly constant, its an indication that the system is leak free but still
contains moisture and may require further evacuation if the reading is above 350
microns.
5.0 EVACUATION
13
4.2 MAXIMUM LENGTH OF LINES
T h e maximum length of interconnecting line is 100 feet .
Always use the shortest length possible with a minimu m number of bends.
N
NOTE: Excessively long refrigerant lines cause loss of equipment capacity.
4.3 VERTICAL LIFT
Keep the vertical lift to a minimum. Use the following guidelines when installing
the unit:
1. DO NOT exceed the vertical lift as indicated on Table 3.
2. It is recommended to use the smallest liquid line size permitted to minimize sys -
t em charge which will maximize compressor reliability.
3. Table 3 may be used for sizing horizontal runs.
TABLE 2: SUCTION LINE LENGTH/SIZE VS CAPACITY MULTIPLIER(R410A)
2 Ton
3 Ton
4 Ton
5 Ton
3/4" O.D.
3/4" O.D.
7/8" O.D.
7/8" O.D.
5/8 Opt.
5/8 Opt.
3/4 Opt.
1 1/8 Opt.
3/4* Std.
3/4* Std.
7/8* Std.
7/8* Std.
Optional 1.00
1.00
1.00
1.00
Standard 1.00
1.00
1.00
0.99
Optional 0.97
0.97
0.98
0.99
Standard 0.98
0.99
0.98
0.98
Optional 0.94
0.94
0.95
0.98
Standard 0.95
0.97
0.97
0.94
Suction Line Connection Size
Model Size
Suction Line Run - Feet
NOTES:
* Standard size
Using suction line larger than shown in chart will result in poor oil return and is not recommended.
25'
50'
100'
Optional 0.90
0.90
0.92
0.97
Standard 0.92
0.96
0.96
0.90
150'
LINE SIZING
