Pulley Tee, Single Item - 427929

The Ansul 427929 Pulley Tee is a single tee-shaped cable routing pulley used in ANSUL R-102 suppression system mechanical detection and actuation cable networks. In plain terms: the R-102 system uses a network of stainless steel cables running from the thermal detection links above the cooking equipment, through a series of pulleys, to the Automan control head. When a fusible link melts from heat, the cable tension releases and the Automan fires the system. The pulley tee is used at points in that cable network where the cable needs to split in two directions — letting you run one cable toward the Automan and another toward an additional detection zone or component.

The 427929 guides the actuation cable through the direction change with minimal friction — critical because too much friction anywhere in the cable run can prevent the cable tension from fully releasing when a link melts, potentially slowing or preventing system activation. This is why using the OEM ANSUL pulley tee matters: the precise groove geometry and smooth bearing surface of the 427929 are engineered for the specific cable diameter and tension specifications of the ANSUL R-102 detection network. A generic pulley with incorrect groove geometry can bind or fray the cable over time.

Available through authorized ANSUL distributors. The 427929 is installed during the original system installation and should be inspected at every semi-annual NFPA 17A and NFPA 96 service visit — check the cable alignment in the pulley groove, verify the pulley rotates freely, and look for any cable fraying at the contact point. A sticky or corroded pulley that resists rotation should be replaced. Document pulley condition in the fire suppression system inspection record.

At every semi-annual NFPA 17A and NFPA 96 inspection, the technician will check each pulley tee in the cable run. The cable must sit correctly in the pulley groove, the pulley must rotate freely without binding, and there must be no cable fraying at the contact point. Grease buildup in the kitchen environment can work its way into pulley mechanisms over time — even a small amount of friction added by a sticky pulley can affect cable tension calibration across the entire detection network. Replace any 427929 that shows corrosion, binding, or cable damage. Document condition in the fire suppression system inspection record.

What is the difference between the pulley tee and the pulley elbow?

A pulley elbow changes the cable direction at a corner — like turning 90 degrees. A pulley tee splits the cable run into two directions from one point — like a "T" junction. In an ANSUL R-102 detection network, you'd use elbows for turns and tees where one cable run splits to cover two separate detection zones or components. Your ANSUL R-102 system design drawings show the exact locations and types of pulleys required for your specific installation.