AIREDALE CR12 - Pipework Installation - Good Practices; Pipe Lengths

Pipework Installation - Good Practices
CAUTION
The following information is based on a complete matched Airedale system using R410A.
• Remove burrs to the ends of the copper tube, holding the tube downward to avoid allowing dirt to contaminate the
tube
• Avoid any contact between the discharge line and the liquid line
Oil Traps
For long vertical rises in discharge lines, it is essential that oil traps are located every 4m to ensure proper oil movement
/ entrapment. In addition there should be an oil trap at the exit of the air handling unit before a vertical riser is applied
(refer to example below).
Pipe Supports
Pipe Lengths
Discharge Line:
Maximum pressure loss for discharge pipework 42 kPa.
Minimum velocity for discharge risers 5 m/s, to ensure
good oil return.
Liquid Line:
Maximum pressure loss for liquid line pipework 21 kPa.
Minimum velocity for liquid line 1.5 m/s, to ensure good oil
return.
IMPORTANT
It is the responsibility of the installing contractor/site engineer to check the pipe size/refrigerant charge is correct for each
system installation and application.
Split systems may require additional oil which should be added to the low pressure side of each compressor.
Design should be in accordance with accepted refrigeration practice to ensure good oil return to the compressor(s)
under all normal operating conditions.
REMEMBER excessive pressure loss in interconnecting pipework will impair system performance; this should be
factored in during the design of the system and where necessary oil traps employed.
Weight of pipework must not be supported by the unit. Three planes of movement must be
allowed between the coil and the rst pipe clamp If this is not possible, a vibration eliminator must
be tted.
CAUTION
The following table identies the maximum distance between pipe supports on vertical and horizontal pipe runs. All
pipework should be clamped prior to insulation being applied.
Pipe O/D (inches) Support distance (m)
3/8 - 7/8” 1.0
1 1/8 - 2 1/8” 2.0
Installation Data
CR12 - CR165 50/60HzCONDENSERS
15
Condenser Technical Manual 6666879 V2_02_2020
Installation