Installation - Operation - Maintenance manual (IOM)
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AIR COOLED CHILLERS & SPLIT UNITS - 1106-E
• 17 •
Minimum refrigeration capacity in kW for oil entrainments up Suction risers
Refrigerant : R407C
Table C
Tubing nominal OD, mm
Saturated
temperature
(°C)
Suction gas
temperature
(°C)
12 15 18 22 28 35 42 54 67 79 105 130
0
0,39 0,71 1,20 2,04 3,88 6,88 11,11 21,31 36,85 55,86
115,24
199,30
-5
10
0,37 0,68 1,14 1,94 3,68 6,53 10,54 20,20 34,94 52,95
109,25
189,14
10
0,47 0,86 1,45 2,47 4,69 8,33 13,44 25,77 44,58 67,56
139,39
241,30
5
20
0,44 0,81 1,36 2,31 4,39 7,79 12,58 24,13 41,73 63,25
130,49
225,90
Minimum refrigeration capacity in kW for oil entrainments up HOT-Gas risers
Refrigerant : R407C
Table D
Tubing nominal OD, mm
Saturated
temperature
(°C)
Suction gas
temperature
(°C)
12 15 18 22 28 35 42 54 67 79 105 130
70
0,60 1,09 1,84 3,13 5,95 10,55 17,03 32,65 56,47 85,59
176,59
305,70
80
0,58 1,06 1,79 3,04 5,78 10,25 16,55 31,74 54,90 83,21
171,67
297,19
30
90
0,57 1,04 1,74 2,96 5,64 10,00 16,14 30,95 53,53 81,13
167,39
289,77
80
0,62 1,13 1,90 3,24 6,16 10,93 17,65 33,85 58,55 88,73
183,07
316,92
90
0,60 1,10 1,85 3,16 6,00 10,65 17,19 32,96 47,01 86,40
178,26
308,60
40
100
0,58 1,07 1,80 3,07 5,83 10,34 16,70 32,02 55,38 83,94
173,17
299,79
90
0,63 1,16 1,94 3,31 6,29 11,16 18,02 34,55 59,77 90,58
186,88
323,52
100
0,61 1,12 1,88 3,21 6,10 10,82 17,47 33,50 57,95 87,83
181,21
313,70
50
110
0,60 1,09 1,83 3,13 5,94 10,54 17,02 32,63 56,44 85,53
176,47
305,49
3.7.3 - Mechanical isolation of refrigerant lines
Isolate refrigerant lines from the building to prevent the vibrations normally generated by the lines to the building
structure. Avoid bypassing the isolation system on the unit by fixing refrigerant lines or electrical conduits too tightly.
Any vibrations will be transmitted to the building by rigid piping.
Lack of vibration isolation on refrigerant pipework will lead to early failure of copper pipe and loss of gas.
3.7.4 - Pressure test
To avoid formation of copper oxide during brazing operations, blow a little dry nitrogen through the pipes.
Piping must be made with tubing that is perfectly clean, plugged during storage and between connections operations.
During these operations, observe the following precautions:
1) Do not work in a confined atmosphere, refrigerant fluid can cause asphyxiation. Make sure there is sufficient
ventilation.
2) Do not use oxygen or acetylene instead of refrigerant fluid and nitrogen for leak testing : this could cause a
violent explosion.
3) Always use a regulator valve, isolating valves and a pressure gauge to control test pressure in the system.
Excessive pressure can cause lines to burst damage to the unit and/or cause an explosion with severe
personal injury.
