Carbon Monoxide Boiler Interlock

Code Required in Florida, Georgia & Texas

AGS Mini Merlin

If there is a dangerous build-up of gas or unsafe levels of carbon monoxide at the sensor, this device can shut off the gas supply via a gas safety valve and/or a gas fire appliance. A code requirement in Florida, Georgia & Texas.

This device has additional features for resetting systems, as well as audible and visual alarms – it can also be integrated with a Building Management System (BMS). For further information on our Mini Merlin refer to our datasheets or alternatively contact our offices today.

Plug & Play Installation – Pre-Programmed Inputs & Outputs

POWER/LINE IN Mains Input: 100-120V ~ 50/60Hz
VALVE OUT Gas Valve Power Output: 100-120V ~ 50/60Hz
Auto Reset & Buzzer Switches
BMS CO 0.5A SWITCHING CURRENT (RESISTIVE LOAD) Switches when CO gas reaches alarm level or if detector encounters a power failure.
REMOTE SHUT OFF Open / Close Circuit Connector Shuts off gas valve if external devices are activated i.e. fire alarm etc
BMS NG/LPG 0.5A SWITCHING CURRENT (RESISTIVE LOAD) Switches when Methane/LPG gas reaches alarm level or if detector encounters a power failure.
Anti-Surge 3.15A 250Vac Fuse, Wire Rating Min. 18AWG, Tinned Copper @ 167°F
Gas Level & TFT Status Display
ULC Listed 61010
Manual Reset After Alarm Condition

Carbon Monoxide Interlock Code Requirements

In Texas, Florida & Georgia, a carbon monoxide detector is required with all new & refurbished boiler(s) installations to automatically shutdown the boiler(s) in the event of high CO levels. See below a summary of the existing codes.

Florida

Florida Compliant - Rule Chapter: 69A-70

509.211 Safety regulations

(4) Requires that every enclosed space or room that contains a boiler regulated under chapter 554 which is fired by the direct application of energy from the combustion of fuels and that is located in any portion of a public lodging establishment that also contains sleeping rooms shall be equipped with one or more carbon monoxide sensor devices that bear the label of a nationally recognized testing laboratory and have been tested and listed as complying with the most recent Underwriters Laboratories, Inc., Standard 2034, or its equivalent, unless it is determined that carbon monoxide hazards have otherwise been adequately mitigated as determined by the division. Such devices shall be integrated with the public lodging establishment’s fire detection system. CO METERS by set to shut boiler off and 35ppm and Must have a Manual Reset.

Georgia

2022 Rules & Regulations of the State of Georgia - Rule 120-3-26-.07

120-3-26-.07 (10) – State Inspection Fees New Installation of Boilers and Installation of Secondhand Boilers or Pressure Vessels

(a) Each boiler room containing one or more boilers or hot water heaters or pressure vessels from which carbon monoxide can be produced shall be equipped with a carbon monoxide detector with a manual reset. The requirements of this subsection apply to boiler rooms in which new installations or re installations of one or more boilers are completed.
(1) The carbon monoxide detector will alarm at 50 ppm and boiler(s) shall be interlocked to disable the burners when the measured level of carbon monoxide rises above 200 ppm.
(2) The carbon monoxide detector shall disable the burners upon loss of power to the detector.
(3) When the carbon monoxide detector trips in the boiler room, the detector should be interlocked with all boilers or hot water heaters or pressure vessels installed in the space to secure the fuel burning equipment thus stopping the production of carbon monoxide.
(4) The carbon monoxide detector shall be calibrated every eighteen months after installation or in accordance with the manufacturer’s recommendations, whichever is more frequent. A record of calibration shall be posted at or near the boiler or be readily accessible to an inspector.
(5) The carbon monoxide detector shall be installed and function in accordance with all other regulations and standards adopted by the Commissioner.
(6) Any boiler room that is monitored by a full-time boiler operator is exempt from the safety shutdown, as defined in ASME CSD-1. The presence of a full-time boiler operated does not exempt such boilers from the alarm requirement.

Texas

16 Texas Administrative Code (TAC) Chapter 65

Each boiler room containing one or more boilers from which carbon monoxide can be produced shall be equipped with a carbon monoxide detector with a manual reset.

(1) The carbon monoxide detector and boiler(s) shall be interlocked to disable the burners when the measured level of CO rises above 50ppm.

(2) The carbon monoxide detector shall disable the burners upon loss of power to the detector.

(3) The carbon monoxide detector shall be calibrated in accordance with the manufacturer’s  recommendations or every eighteen months after installation of the detector. A record of calibration shall be posted at or near the boiler, or be readily accessible to an inspector.

(4) The requirements in this subsection apply to boiler rooms in which need installations or re-installations of one or more boilers are completed on or after September 1, 2020.’