Caleffi 6686I5S1A-IN Twistflow Inverted Manifold 9 Loops

Product Description

The CALEFFI 6686I5S1A-IN is a 9-loop TwistFlow inverted distribution manifold designed for hydronic radiant panel heating systems. It features a built-in temperature gauge and 1-inch NPT inlet ball valves for straightforward integration into radiant floor heating supply and return lines. The manifold is rated to a maximum working pressure of 150 psi and a maximum operating temperature of 180 degrees F, with a peak temperature tolerance of 200 degrees F. Each circuit outlet is sized at 3/4 inch, with a loop Cv of 1.23 across the combined supply and return ports. Licensed hydronic or plumbing contractors typically specify and install this manifold in residential and light commercial radiant floor systems.

This manifold is suited for radiant floor heating applications where precise, balanced flow distribution across multiple circuits is required. The inverted configuration positions supply and return headers in a compact arrangement that simplifies rough-in in mechanical rooms or utility spaces. The integrated temperature gauge provides at-a-glance monitoring of fluid temperature at the manifold station. Compatible media includes water or glycol solutions up to 50 percent concentration, making it appropriate for systems in freeze-prone climates. The 9-loop configuration supports larger zone layouts common in residential new construction and whole-home radiant retrofit projects.

Key Features

• 9-loop inverted manifold design for radiant floor heating distribution
• 1-inch NPT inlet ball valves for supply and return connections
• 3/4-inch outlets with 2-inch center-to-center spacing
• Loop Cv of 1.23 (combined supply and return ports) for balanced flow
• Built-in temperature gauge for on-manifold fluid monitoring
• Accepts water or glycol up to 50 percent concentration

Compatibility

Designed for use in hydronic radiant panel heating systems requiring a 9-circuit distribution manifold with a 1-inch supply inlet and 3/4-inch loop outlets. Compatible with water or glycol-based heating fluid at concentrations up to 50 percent.

Installation Notes

Installation should be performed by a licensed plumber or hydronic heating contractor in accordance with applicable local mechanical codes and the International Plumbing Code. Shut down the heating system and relieve system pressure before making any connections to the manifold. Ensure all loop circuits are properly purged of air after installation using the manifold vent ports before returning the system to service. Do not exceed the rated working pressure of 150 psi or the maximum temperature of 180 degrees F during normal operation.

Technical Specifications

• Number of Loops: 9
• Supply Inlet Size: 1 inch NPT
• Outlet Size: 3/4 inch
• Outlet Center Distance: 2 inches
• Loop Cv: 1.23 (combined supply and return ports)
• Maximum Working Pressure: 150 psi
• Maximum Operating Temperature: 180 degrees F (82 degrees C)
• Maximum Peak Temperature: 200 degrees F (93 degrees C)
• Compatible Media: Water or glycol up to 50 percent concentration

Standard Information

• Brand: CALEFFI
• Manufacturer Part Number: 6686I5S1A-IN