Haier AU42NALEAA Service Manual - Page 104

>a__WcU[S^ a`V[e[a`Wc (d) When constructing drain piping for several units, position the common pipe about 100 mm below the drain outlet of each unit as shown in the sketch. Use VP-30(11/4") or thicker pipe for this purpose. Secure the elevation as high as possible (approx. 100 mm) (e) The stiff PVC pipe put indoor side should be heat insulated. A downhill grade of 1/100 or more VP 30 (f) Avoid putting the outlet of drain hose in the places with irritant gas generated. Do not insert the drain hose directly into drainage, where the gas with sulfur may be generated. (g) Backwater bend Because the drain spout is at the position, which negative pressure may occur. So with the rise of water level in the drain pan, water leakage may occur. In order to prevent water leakage, we designed a backwater bend. The structure of backwater bend should be able to be cleaned. As the below figure shown, use T type joint. The backwater bend is set near the air conditioner. As figure shown, set a backwater bend in the middle of drain hose. H2 H1 H1=100mm or the static pressure of air sending motor H2=1/2H1 (or between 50~100mm) Drainage Test 1 Conduct a drainage test after completion of the electrical work. 2 During the trial, make sure that drain flows properly through the piping and that no water leaks from connections. 3 In case of a new building, conduct the test before it is furnished with the ceiling. 4 Be sure to conduct this test even when the unit is installed in the heating season. Procedures 1 Supply about 1000 cc of water to the unit through the air outlet using a feed water pump. 2 Check the drain while cooling operation. 6. Installation of air suction and discharging duct muffler cavity (air sending) Sacking joint Insulation A Air volume adjuster Enlarging chart of profile chart A Vibration resistance hook Air outlet Air conditioner main unit Ceiling Air suction grille with air filter Checking meatus Please consult the after-sales service worker of Haier Air Conditioner for the choosing and installation of suction inlet, suction duct, discharging outlet and discharging duct. Calculating the design drawing and outer static pressure, and choose the discharging duct with proper length and shape. The length difference among every duct is limited below 2:1. Reduce the length of duct as possible as can. Reduce the amount of bend as possible as can. Use heat insulation material to bind and seal the part connecting main unit and the flare part of air discharging duct. Perform duct installation work, before the ceiling fit. Bad example Bad example Good example -104-