Daikin AVS Installation Manual

Also see for AVB: Installation and maintenance manual

Contents

Daikin AVS Installation Manual Manual pdf 29 page image

IM 817-4 Page 29 of 60Ensure refrigerant pressure taps are installed in piping endcompartment for proper charging and setting of the TXVvalve.1-3/8" Left Endof unit(Less end panel)Thermal ExpansionValve (TXV)Superheat Adjustment.Return (Suction Line)Bulbattached in the 2 or10 o'clock positionEqualization TubeCondensate Drain (Protect Drain Pan witha quenching cloth when brazing, to preventdamage).Supply (Liquid Line)Direct-Expansion (DX) R-22 PipingDX coils have O.D. sweat connections. Interconnecting tubing isfield-supplied. See Table 21, page 31 and job-specific drawings forcorrect tubing sizes.Wrap TXV valve with a quenching cloth and remove bulb fromsuction line to avoid valve damage while brazing.Condensate piping:Daikin cooling unit ventilators are designed for condensate removalinto a condensate disposal system. Do not connect the unit drainconnection so that condensate exits to the outside and/or is exposed tofreezing temperatures. Installer is responsible for any damage thatmight be caused from freezing condensate. In applications with anend compartment auxiliary drain pan, see the installation instructionsshipped with the auxiliary drain pan itself.STOP! Before BrazingRemove Bulb WhenBrazingTo Prevent OverheatingDamageUse A Quenching Cloth When Brazing, to Prevent Overheating The TXV ValveBody (Avoid Valve Damage and Erratic Operation)Figure 86 - TXV Valve Piping Detail (Left Hand Shown)Proper ventilation is required for brazing. When brazing, be sure toprotect unit ventilator components from overheating damage (meltinginsulation, also damage to valves, wiring, electronics, sensors, etc.).During brazing, bleed nitrogen through the piping. Using field-suppliedmaterial suitable for insulating refrigerant lines, wrap the thermalexpansion valve (TXV) bulb and the piping between the TXV andthe point where it enters the coil with at least one thickness of thematerial. Likewise, insulate the suction line. (See figures 87-90 fortypical piping and wiring)Ensure proper insulation of supply and return piping. Proper insulationprevents loss of unit ventilator capacity, overheating of end compartment,and / or moisture dripping.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"Figure 85 - Piping Stub-Up Details, 6" End PanelInstall Pressure Taps on Supply (Liquid Line) and Return (SuctionLine) Piping (By Others).6" End PanelCAUTIONNOTICE