Onix Installation Manual.qxd - Affordable Home Inspections

Zoningmanifold to keep the assemblyhidden from everyday view.2. Manifold placement determinesthe minimum tubing circuit length.Minimum circuit equates to the distancefrom the manifold to the farthestpoint, taking right angles, andback. For most residential projects,200 ft. circuits are adequate. Formost commercial projects, 300 -400 ft. circuits are used.ZONE 1Typical radiant zoning.ZONE 2ASupplyMax.Pipe Size Flow Rate (typical)3/4" . . . . . . . . . . . .4 gpm1" . . . . . . . . . . . .10 gpm1-1/4" . . . . . . . . . .15 gpm1-1/2" . . . . . . . . . .22 gpm2" . . . . . . . . . . . .45 gpmper square foot, like a Sunroom, itshould not be zoned with a room thatonly requires 10 BTUs per square foot.ZONE 2Step 3:Manifold LocationEach zone will generally have onemanifold pair - a supply and a return.Watts Radiant offers a wide range ofmanifolds ranging from custom brassmanifolds, to cast brass manifolds, andstainless steel. More information onmanifold options can be found in theWatts Radiant product catalog.3. Locate the manifold within thegiven zone. If a manifold is locatedoutside the zone boundary, thentwice the distance (supply andreturn) to the manifold should beadded to each circuit length. Forexample, if a zone calls for 180 ft.circuits, and the manifold is movedto a location 10 ft. away, then 20 ft.is added to the circuit. The circuitlengths required for this zone willbe 200 ft.4. Manifolds should be mountedhorizontally, if possible. Thisallows for easier circuit connectionto the manifold. Also, if avent/purge assembly (recommended)is installed on the manifolds,they must be mounted horizontallyin order to allow the vents to workproperly without leaking.5. Manifold sizes are based on thezone flow rates (in gpm). Thesmallest trunk size provided byWatts Radiant is 1". For commercialand snowmelt applicationsThe above illustration uses the occupancytechnique for zoning, dividingthe waking areas from the sleepingareas. Zoning choices are subjectto change as the design progresses. Itis not uncommon to go back andrearrange rooms and zones to create abetter overall design.With respect to any design, the manifoldlocation has a direct impact notonly on the aesthetics of a room, butalso on the tubing being installed.1. Manifolds should be placed in alocation that allow them to remainaccessible, but also out of sight. Incabinets, behind doors, and in closetsare good locations. These locationsallow for the use of a coverplate or manifold box over theWatts Radiant: Onix Installation Manual page 13