Delta 21CK018C24 Instruction Manual page 54

The following table describes the torques for tightening nuts of different pipe diameters.
(3) The bending angle of the fitting pipe shall not be too small, and otherwise the pipe may break.
Please use a bender when bending the fitting pipes.
3.Air Purging and Leakage Test
(1). Take out the nut cap of the inlet for refrigerant.
(2). Connect the tube of the vacuum meter with the vacuum pump; link the low-pressure end to the
inlet for refrigerant.
(3). Start the vacuum pump. When the indicator turns to-1 bar, close the low pressure handle and stop
vacuumizing. Keep for 15 minutes, and ensure that the pressure of the vacuum watch remain.
(4). Take out the cap of the gas valve together with the liquid valve.
(5). Loosen the cord of liquid valve until the pressure rise to 0 bar.
(6). Dismantle the tube from the cover of the inlet of refrigerant then, tighten the cover.
(7). Loosen the valve cord of the gas valve as well as the liquid valve entirely.
(8). Tighten the caps of the gas valve and liquid valve so as to check whether leakage occurs.
Pipe Diameter
φ6.34mm
φ9.52mm
φ15.88mm
φ12.7mm
φ19.05mm
φ22.05mm
Fig 17
Tightening Torque
15-30 (N·m)
35-40 (N·m)
60-65 (N·m)
45-50 (N·m)
70-75 (N·m)
80-85 (N·m)
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