11.2.4
Evacuation of the Equipment
WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND
PIPES in the following procedure.
Vacuum
1
Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way
valve.
2
Connect the micron gauge between vacuum pump and service port of outdoor units.
3
Turn on the power switch of the vacuum pump and make sure that connect digital micron gauge and to pull
down to a value of 500 microns.
4
To make sure micron gauge a value 500 microns and close the low side valve of the charging set and turn off
the vacuum pump.
5
Disconnect the vacuum pump house from the service port of the 3-way valve.
6
Tighten the service port caps of the 3-way valve at a torque of 13.3 Ibf•ft (18 N•m) with a torque wrench.
7
Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to "Open"
using a hexagonal wrench (5/32" (4 mm)).
8
Mount valve caps onto the 2-way valve and the 3-way valve.
Be sure to check for gas leakage.
o
If micron gauge value does not descend 500 microns, take the following measures:
-
If the leak stops when the piping connections are tightened further, continue working from step 3.
-
If the leak does not stop when the connections are retightened, repair location of leak.
-
Do not release refrigerant during piping work for installation and reinstallation.
-
Be careful with the liquid refrigerant, it may cause frostbite.
Indoor unit
pump
Liquid side
Two-way valve
Close
Gas side
Three-way valve
Close
44
Outdoor unit