Panasonic CS-E18SD3UAW service manual - Page 44

Evacuation of the Equipment

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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. Indoor unit Liquid side Two-way valve Outdoor unit Gas side Close Three-way valve Close Vacuum pump 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. o Be sure to check for gas leakage.  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. 44

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44
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.
Gas side
Liquid side
Outdoor unit
Two-way valve
Three-way valve
Indoor unit
Vacuum
pump
Close
Close
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.
o
Be sure to check for gas leakage.
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.