AUKS AL-H18/4DR1(U), Service Manual

Page: 102 / 161

AUKS DC Inverter 1 Drive1 50HZ R410A Universal outdoor unit
102
Elbow and Oil loop conversion tablet
Type
Pipe Dia.(mm)
Bend Oil Loop
6.35 0.10 0.7
9.52 0.18 1.3
12.70 0.20 1.5
15.88 0.25 2.0
19.05 0.35 2.4
22.02 0.40 3.0
Equivalent pipe length L
＝
Actual Pipe length L+ Bend Qty× Equivalent pipe bend Oil Loop Qty ×
Equivalent Oil Loop length
Sample:
ALCA-H42A5/C5 Actual Pipe length is 25 meters, Gas pipe diameter is 19.05mm. If there’s 5 bends and
2 oil loops during the installation, then the equivalent pipe length should be:
L=25+0.35×5+2.4×2=31.5(m)
◇ Specification of connection pipe for indoor unit and outdoor unit
Cooling Capacity(Btu/h) 18000 24000 36000 48000 60000
Connection
Pipe (mm)
Liquid Pipe Φ6.35 Φ9.52 Φ9.52
Gas Pipe Φ12.7 Φ15.88 Φ19.05
Max.
Length(m)
Liquid Pipe Dia. Φ6.35 Φ9.52 Φ9.52
Gas Pipe Dia. Φ12.7 Φ15.88 Φ19.05
Max. Length 20 30 50
Max. Height (m) 15 20 30
Max. Bend Qty 5 8 10
Emptying or vacuum
Before charging the refrigerant to the system, to ensure that there is no impurities, water or
non-condensable gas. So, emptying and vacuum operation should be carried out.
◇ Vacuum: when process this operation please be sure that the connection pipe is tightened up.
1. Screw off the cover of maintenance valve connection, connect the pressure gauge to the connection
of maintenance valve
2. Connect the vacuum pump to the pressure gauge, turn on the vacuum pump and pressure gauge to
process the vacuum operation toward the indoor unit and piping, while to ensure that the absolute
pressure is no less than 50Pa after this operation.
3. Turn off the pressure gauge and vacuum pump to keep the pressure in the same level in 20 minutes.
◇
Emptying: when process this operation, please disconnect the high pressure valve with liquid valve.
1. Connect the gas valve of the stop valve to the thimble side of the rubber hoses, the other side of
rubber hoses should be connected to the refrigerant tank.
2. Open the refrigerant tank valve, using the refrigerant inside the tank with high speed to empty the air
in the indoor unit and the connection piping. When the outlet air becomes mist (it feels cold by
touching it), then the air is emptied.
3. When ensure that the air is emptied, connect and tighten the high pressure valve of outdoor unit stop
valve and liquid side connection pipe, keep this state more than 10 seconds.
4. Use soapy what to test each connection junctions (including lengthen piping welding junction)
5. Confirmed that there is no leakage, turn off the valve of refrigerant tank, take down the rubber hose
as well.
◇
Turn on the high-low pressure valve of the outdoor unit.
After vacuum and emptying, screw back the cover of the maintenance valve of outdoor unit low pressure
valve, screw off the high-low pressure valve of the outdoor unit (note: shall totally turned off ). Connect
the refrigerant to the system.