285.1 Precautions When Doing the Piping Work Keep piping as short as possible and slope it downwards at a gradient of at least 1/100 so thatair may not remain trapped inside the pipe.For example: Keep pipe size equal to or greater than that of the connecting pipe. Install the drain piping as shown and take measures against condensation. Improperly riggedpiping could lead to leaks and eventually wet furniture and belongings. When directly connecting a hard vinyl chloride pipe joint to the drain hose connected to the indoorunit, use a commercially available hard vinyl chloride pipe joint (nominal diameter 13mm). Drain hose connected to the indoor unit. Commercially available hard vinyl chloride pipe joint(nominal diameter 0.51 in). Commercially available hard vinyl chloride pipe (nominal diameter 0.51 in). Do not connect the drain piping directly to sewage pipes that smell of ammonia. The ammonia inthe sewage might enter the indoor unit through the drain pipes and corrode the heat exchanger.Pipe Diameter Unit: in Tightening Torque1/4 11-22ft.-lb.3/8 26-29ft.-lb.1/2 33-37ft.-lb.5/8 44-48ft.-lb.5 INSTALLATION OF DRAIN PIPEMulti Variable Air Conditioners Indoor Unit102Pipe Diameter Unit: in Tightening Torque1/4 11-22ft.-1b.3/8 26-29ft.-1b.1/2 33-37ft.-1b.5/8 44-48ft.-1b.5 Installation of Drain Pipe5.1 Precautions When Doing the Piping Work◆ Keep piping as short as possible and slope it downwards at a gradient of at least 1/100 so thatair may not remain trapped inside the pipe.For example:◆Keep pipe size equal to or greater than that of the connecting pipe.◆Install the drain piping as shown and take measures against condensation. Improperly riggedpiping could lead to leaks and eventually wet furniture and belongings.◆When directly connecting a hard vinyl chloride pipe joint to the drain hose connected to the indoorunit, use a commercially available hard vinyl chloride pipe joint (nominal diameter 13mm).◆ Drain hose connected to the indoor unit. Commercially available hard vinyl chloride pipe joint(nominal diameter 0.51 in). Commercially available hard vinyl chloride pipe (nominal diameter 0.51 in).◆Do not connect the drain piping directly to sewage pipes that smell of ammonia. The ammonia inthe sewage might enter the indoor unit through the drain pipes and corrode the heat exchanger.Multi Variable Air Conditioners Indoor Unit102Pipe Diameter Unit: in Tightening Torque1/4 11-22ft.-1b.3/8 26-29ft.-1b.1/2 33-37ft.-1b.5/8 44-48ft.-1b.5 Installation of Drain Pipe5.1 Precautions When Doing the Piping Work◆ Keep piping as short as possible and slope it downwards at a gradient of at least 1/100 so thatair may not remain trapped inside the pipe.For example:◆Keep pipe size equal to or greater than that of the connecting pipe.◆Install the drain piping as shown and take measures against condensation. Improperly riggedpiping could lead to leaks and eventually wet furniture and belongings.◆When directly connecting a hard vinyl chloride pipe joint to the drain hose connected to the indoorunit, use a commercially available hard vinyl chloride pipe joint (nominal diameter 13mm).◆ Drain hose connected to the indoor unit. Commercially available hard vinyl chloride pipe joint(nominal diameter 0.51 in). Commercially available hard vinyl chloride pipe (nominal diameter 0.51 in).◆Do not connect the drain piping directly to sewage pipes that smell of ammonia. The ammonia inthe sewage might enter the indoor unit through the drain pipes and corrode the heat exchanger.Multi Variable Air Conditioners Indoor Unit102Pipe Diameter Unit: in Tightening Torque1/4 11-22ft.-1b.3/8 26-29ft.-1b.1/2 33-37ft.-1b.5/8 44-48ft.-1b.5 Installation of Drain Pipe5.1 Precautions When Doing the Piping Work◆ Keep piping as short as possible and slope it downwards at a gradient of at least 1/100 so thatair may not remain trapped inside the pipe.For example:◆Keep pipe size equal to or greater than that of the connecting pipe.◆Install the drain piping as shown and take measures against condensation. Improperly riggedpiping could lead to leaks and eventually wet furniture and belongings.◆When directly connecting a hard vinyl chloride pipe joint to the drain hose connected to the indoorunit, use a commercially available hard vinyl chloride pipe joint (nominal diameter 13mm).◆ Drain hose connected to the indoor unit. Commercially available hard vinyl chloride pipe joint(nominal diameter 0.51 in). Commercially available hard vinyl chloride pipe (nominal diameter 0.51 in).◆Do not connect the drain piping directly to sewage pipes that smell of ammonia. The ammonia inthe sewage might enter the indoor unit through the drain pipes and corrode the heat exchanger.