Daikin AVV Installation And Maintenance Manual

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Contents

Daikin AVV Installation And Maintenance Manual Manual pdf 36 page image

IM 817-7 36 www.DaikinApplied.comCondensate Piping:Daikin cooling unit ventilators are designed forcondensate removal into a condensate disposalsystem. Do not connect the unit drain connection sothat condensate exits to the outside and/or is exposedto freezing temperatures. Installer is responsible for anydamage that might be caused from freezing condensate.In applications with an end compartment auxiliary drainpan, see the installation instructions shipped with theauxiliary drain pan itself.Direct-Expansion (DX) R-410 PipingDX coils have O.D. sweat connections. Interconnectingtubing is field-supplied. See Table 31 on page 38 andjob-specific drawings for correct tubing sizes.CAUTIONWrap TXV valve with a quenching cloth and remove bulb fromsuction line to avoid valve damage while brazing.Proper ventilation is required for brazing. When brazing, besure to protect unit ventilator components from overheatingdamage (melting insulation, also damage to valves, wiring,electronics, sensors, etc.).During brazing, bleed nitrogen through the piping. Usingfield-supplied material suitable for insulating refrigerant lines,wrap the thermal expansion valve (TXV) bulb and the pipingbetween the TXV and the point where it enters the coil withat least one thickness of the material. Likewise, insulate thesuction line. (See Figure 95 through Figure 98 for typicalpiping and wiring)Ensure proper insulation of supply and return piping.Proper insulation prevents loss of unit ventilator capacity,overheating of end compartment, and / or moisture dripping.NOTICEEnsure refrigerant pressure taps are installed in piping endcompartment for proper charging and setting of the TXV valve.STOP! Before BrazingUse A Quenching Cloth When Brazing, to Prevent OverheatingThe TXV Valve Body (Avoid Valve Damage and Erratic Operation)Figure 94: TXV Valve Piping Detail (Left Hand Shown)Thermal ExpansionValve (TXV)Superheat Adjustment.Return (Suction Line)Bulbattached in the 2 or10 o'clock positionEqualization TubeSupply (Liquid Line)Remove Bulb WhenBrazing To PreventOverheating DamageNote: Install Pressure Taps on Supply (Liquid Line) and Return(Suction Line) Piping (By Others).Figure 93: Piping Stub-Up Details, 6″ End Panel1-3/8" Left Endof unit(Less end panel)Piping Stub-up Within CabinetUnit End CompartmentPiping Stub-up Within 6" End Panel End Panel 6"Application and DimensionWall Line1"115⁄8"10"Note: Space available in leftend compartment for pipingstub-up. Stub-up, includingunions and shutoff valves,must disconnect below floorline for unit installation andremoval.Space availableat left end of unitfor piping stub-upwhen 6" end panelis used.Left End of unit(Less end panel)Wall Line4"1"Unit End Compartment6"6" End Panel