ACD FXD-ACD60 - Tightening Torque Specification; 3.2.3 Vacuum Pumping and Leak Detection; 3.2.3.1 Vacuum Pumping

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
15
Pipe diameter (inch)
Tightening torque (N·m)
Ф1/4
15-30
Ф3/8
35-40
Ф1/2
45-50
Ф5/8
60-65
Ф3/4
70-75
Ф7/8
80-85
3.2.2.5 Sealing of the Knock-off Hole
As for the built-in valve model, during the installation process for connection
pipe, when the connection pipe is passing through the knock-off hole, conduct
sealing with insulated cotton in the knock-off hole of outdoor unit to prevent small
animals from entering. See the following figures.
3.2.3 Connection Pipe Vacuum Pumping and Leak Detection
3.2.3.1 Vacuum Pumping
①
Make sure the outlet of vacuum pump is away from fire source and is
well-ventilated.
②
Before vacuum pumping, make sure the unit cut-off valves are closed.
③
When vacuum pumping, both the liquid pipe and the gas pipe must be
pumped.
(1) Remove the caps of the liquid valve, gas valve and also the service port.
(2) Connect the hoses at the low pressure and high pressure sides of the
manifold valve assembly to the service ports of the unit’s gas valve and
liquid valve, and meanwhile the gas and liquid valves should be kept closed
in case of refrigerant leak.
(3) Connect the hose used for evacuation to the vacuum pump.
(4) Open the switch at the low pressure and high pressure side of the manifold
valve at the same time, assembly and start the vacuum pump.