DC Inverter
X-Series
for R410A Unitary Split Air Conditioner
14
3.2.2.4.2 Screw Connection
Pipe diameter (inch)
Tightening torque (N·m)
Ф
1/4
15-30
Ф
3/8
35-40
Ф
1/2
45-50
Ф
5/8
60-65
Ф
3/4
70-75
Ф
7/8
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
