Ariz. Admin. Code § R20-5-430 - Forced Circulation Lined Hot Water Heaters

A. All water tube or coil-type Lined Hot Water Heaters that require forced circulation to prevent overheating and failure of the tubes or coils shall have a safety control, to prevent burner operation at a flow rate inadequate to protect the Lined Hot Water Heater unit against overheating, at all allowable firing rates. The safety control shall shut down the burner and prevent restarting until an adequate flow is restored. The flow sensing device shall be labeled and listed by a nationally recognized testing agency as a standard for limit controls complying with UL 353. This safety control shall be independent of any other operating controls.

B. All water tube or coil-type Lined Hot Water Heaters that require forced circulation to prevent overheating and failure of the tubes or coils, shall have a manually operated remote shutdown switch or circuit breaker and shall be located just outside the Lined Hot Water Heater's room door and marked for easy identification. The shutdown switch shall be installed in a manner to safeguard against tampering. If a Lined Hot Water Heater's room door is on the building exterior, the switch shall be located just inside the door. If there is more than one door to the Lined Hot Water Heater's room, there shall be a switch located at each door. The remote shutdown switch or circuit breaker shall disconnect all power to the burner controls.

Notes

Ariz. Admin. Code § R20-5-430

New Section made by final rulemaking at 15 A.A.R. 1496, effective August 18, 2009 (Supp. 09-3). Amended by final rulemaking at 28 A.A.R. 3952, effective 12/7/2022.