Main Unit and Piping
Electrical
Test Operation
Reference
31
4. Refrigerant Piping
4-6. Stop valve connections and opening/closing
1) Stop valve connections
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Both of liquid and vapor line piping’s must be brazed when connecting.
2) Opening and closing the stop valves
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Open the liquid line stop valve and then open the vapor line stop valve.
1. Remove the cap.
2. Turn the valve shaft by 90° counterclockwise with an
open-end wrench. The valve is fully opened at the
position where the pin hits the stopper.
3. Firmly tighten the cap.
Important reminder
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Connect refrigerant piping with the stop valves on the outdoor unit fully closed (factory default).
Do not operate the stop valves until all the refrigerant piping for the indoor and outdoor units have
been connected, and the refrigerant leakage test, vacuuming operation and additional refrigerant
charging has been completed. Note that both the vapor and the liquid line valves must be fully
open in operating.
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Make sure not to damage the power supply wire, the communication wire, the condensation water
drain port or the exhaust water drain hose by brazing flame when brazing the refrigerant pipes to
the stop valves.
< Liquid / Vapor >
< Vapor line >
Fully closed (Factory default)
Fully open
Valve shaft
Valve shaft
Liquid line
26 to 32 N•m
Vapor line
26 to 32 N•m
19.2 to 23.6 Ibsft
19.2 to 23.6 Ibsft