3-21. Installing the Drain Piping
(1)Prepare standard hard PVC pipe (O.D.
(2)If connecting a drain joint (supplied) to the threaded drain port, first wrap the drain port threads with sealing tape, then connect the joint. (Fig.
(3)After connecting the drain pipe securely, wrap insulator (field supply) around the pipe.
Sealing tape
Drain pan | Drain joint |
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Drain opening
(25A or
Fig.
Downward gradient
(4)Ensure the drain pipe has a downward gradient (1/100 or more) and prepare traps as indicated in Fig.
(5)Also, in another part of the pipe arrangement, prepare traps with an inspection plug to clean dust or debris that may cause leaking of water. (Fig.
(6)After connecting the drain piping, slowly pour water into the drain pan to check that the water drains smoothly.
3-22. Caution for Ducting Work
●This unit has high static pressure (applicable external static pressure Max. 24.2 ⋅
in.Aq). In the case of small pressure resistance (for instance, a short duct), install a damper for adjusting air flow volume as air flow volume / air flow noise increases.
●If the air conditioner is to be installed in a room such as an office or meeting room which needs a low sound level, provide a supply and return noise absorption chamber with an acoustic liner.
●Include an air filter (field supply) at the return duct.
Min. 1/100
Good
D
Not good
Fig.
Min.
Min.
Inspection plug
3-23. Indoor Fan Performance
How to Read the Diagram
The vertical axis is the External Static Pressure (psi, in.Aq) while the horizontal axis represents the Air Flow (ft.3/minute). The characteristic curve for the “H,” “Med,” and “Lo” fan speed control.
The nameplate values are shown based on the “H” air flow. Therefore in the case of 36 Type, the flow is 1059 ft.3/minute, while the External Static Pressure is 0.72 in.Aq at “H” position. If the external static pressure is too great (due to long extension of duct, for example), the air flow volume may drop too low at each air outlet.
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NOTE H : At shipment
Fig.
45