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10.1.4.2.4 Gas leak checking
Pressure test to system to 400 PSIG with dry nitrogen, in stages. Thoroughly leak check the system.
If the pressure holds, release the nitrogen and proceed to section 10.1.4.3.
10.1.4.3 Evacuation of the equipment
When installing an air conditioner, be sure to evacuate the air inside the indoor unit and pipes in the following
procedures.
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 hose 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 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”).
8. Mount valve caps onto the 2-way valve and the 3-way valve.
o Be sure to check for gas leakage.
10.1.4.4 Connect the Cable to the Outdoor Unit
1. Remove Top panel.
2. Remove Control Board Cover (Resin and Metal).
3. Remove Plugs.
4. Fix the conduit connectors to the knockout holes with
lock-nuts, then secure them against the side panel.
5. All wires pass through conduits.
6. Connecting wire between indoor unit and outdoor unit
should be UL listed or CSA approved 4 conductor
wires minimum AWG16 in accordance with local
electric codes.
7. Wire connection to the power supply (208/230V 60Hz)
through circuit breaker.
o Connect the UL listed or CSA approved wires
minimum AWG14 to the terminal board, and
connect the other end of the wires to ELCB /
GFCI.
8. Connect the power supply cord and connecting wire
between indoor unit and outdoor unit according to the diagram below.