December 07, 2018

Performance Related Concern with Johnson Controls/Tyco K33.6 Upright Standard Response Storage Sprinkler Model TY9101 (Ultra K34)

  • Type of Notification: Performance Related Concern
  • FM Approval Status: FM Approved

FM Approvals has determined there is a potential for deflector failures with the TY9101 (Ultra K34) during flow conditions below the maximum rated working pressure.

For further information including how to obtain replacement sprinklers please contact at Johnson Controls.

Company (As Listed in the Approval Guide): Tyco Fire Products LP

Name: Johnson Controls/Tyco

Address: 1467 Elmwood Avenue, Cranston, RI 02910

Contact Information: Tel: 401-781-8220 Email:

Product Identity: This upright fire sprinkler (see Fig.1) is used exclusively on dry sprinkler systems in low temperature freezer/cooler storage warehouses.

Description: K33.6 Upright Standard Response Storage Sprinkler

Make/Model: TY9101 (Ultra K34)

Date Codes Affected: Sprinklers manufactured between August 2016 and October 2018.

FM Approval status: FM Approved

Hazard involved: Due to a manufacturing assembly error, this sprinkler is susceptible to failure of the connection between the sprinkler frame and deflector when flowing water at pressures greater than 100 psi (6.9 bar). Without a deflector, the sprinkler cannot distribute water as designed over its coverage area and would not provide effective fire control and an uncontrolled fire may result. Johnson Controls has corrected the problem and replacement sprinklers can be identified by an extended load screw (see Fig. 2). In addition, Johnson Controls has issued letters to their customers concerning this manufacturing error (see attached).

Using This Product?

If you suspect you are in possession of the sprinklers described in this alert please bring that to the attention of:

Antonio Pires

Norwood, MA, United States

+1 (1) 781-255-4825