Daikin AVV Installation And Maintenance Manual

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Contents

Daikin AVV Installation And Maintenance Manual Manual pdf 30 page image

IM 817-7 30 www.DaikinApplied.comTypical Piping ArrangementsHeating valve actuators should be mounted in an uprightposition above the centerline of the valve body and shouldbe piped normally open to the coil. Modulating valveactuators for hot water applications may be positionedabove the valve body a maximum of 75° from the vertical.For steam applications only, mount the modulating valveactuator above the valve body at 45° from the vertical.Two-position, end-of-cycle (EOC) valves used with faceand bypass damper controlled units may be positionedabove the valve body a maximum of 85º from the vertical.All control valves are shipped loose to help avoid shippingdamage to the piping or the coil connection stub fromthe weight of the valve, and to provide the installingcontractor with maximum flexibility in making the fieldpiping connections. Refer to Daikin factory instructionsheet shipped with the unit for port orientation and a pipingschematic. Control valves must be installed on the unitsin which they are shipped. Indiscriminate mixing of valvesamong units can result in valves not properly sized for thedesired flow rate. Control valves should be installed so thatthere is 2" minimum clearance to remove the actuator fromthe valve body. As a future service consideration, provideunions for removal of the unit coil and/or the control valve.Heating – Hot Water End of CycleValve PipingThe 2-way End of Cycle hot water (or 2-pipe CW/HW)valve is furnished normally open to the coil. When thevalve is de-energized (off) there is full flow through thecoil. Energizing the valve shuts off the water flow.Figure 78: Typical 2-Way End of Cycle Valve, Water PipingReturnReturnBalancing and Shutoff ValveShutoff ValveSupplySupply2-way EOCValve Unit CoilUnionsA BOCT Sensor(2-pipe CW/HW Units Only)Note: For Erie E.O.C. water valves, always have thedirection of water flow piped to the B-port of the valve.3-Way End of Cycle, Normally Open, HotWater or 2-pipe CW/HW Valve Piping(typical)The 3-way End of Cycle hot water (or 2-pipe CW/HW)valve is furnished normally open to the coil. When thevalve is de-energized (off) there is full flow through the coil.Energizing the valve allows the water to bypass the coil.ReturnReturnBalancing and Shutoff ValveShutoff ValveSupplySupply3-way EOC ValveUnit CoilUnionBalancingValveBypassABAB UnionOCT Sensor(2-pipe CW/HW Units Only)3-way End of Cycle, Normally Closed,Chilled Water Valve Piping (typical)The 3-way EOC CW valve is furnished normally closedto the coil. When the valve is de-energized (off) theflow bypasses the coil. Energizing the valve allows flowthrough the coil.ReturnReturnSupplyUnit CoilUnionShutoff ValveSupply3-wayEOC ValveUnionBypassA BABBalancing ValveBalancing and Shutoff Valve