Forney IDD-II Manual 

Standard Models: IDD-II, IDD-IIL, IDD-IIU, and IDD-Ultra CEX Models: IDD-IICEX, IDD-IILCEX, IDD-IIUCEX 372000-05 Rev J ...

372000-05 Rev J i INTRODUCTION This manual contains information for the IDD Flame Detector Heads from Forney Corporation, 16479 N. Dallas Parkway, Suite 600, Addison, Texas. All personnel should become thoroughly familiar with the contents of this manual before attempting to install, operate or maintain the system. Because it ...

372000-05 Rev J ii TABLE OF CONTENTS Section 1 Description .................................................................................................................................. 3 Figure 1 Dimensional drawing – IDD Standard housing ................................................................. 3 1.1 IDD CEX .. ...

372000-05 Rev J 3 Section 1 Description The Forney IDD flame detector heads are non-repairable devices that generate an AC signal of variable amplitude and frequency proportional to a burner’s flame intensity. The detector head transmits the signal through a four-conductor cable to an applicable Forney flame amplifier. The I ...

372000-05 Rev J 4 1.1 IDD CEX Figure 2 Dimensional drawing – IDD CEX  Housing Material: Aluminum Alloy, A 380  Window joints are cemented using Aremco bond 568 high temperature epoxy with a temperature index of -204C  Window material is fused silica with a temperature index of 950C  O-rings are made of BUNA-N wit ...

372000-05 Rev J 5 1.2 Mechanical Specifications ATTRIBUTE STANDARD MODELS ATEX MODELS Models IDD-II, IDD-IIL, IDD-IIU, IDD-Ultra IDD-IICEX, IDD-IILCEX, IDD-IIUCEX Approvals Factory Mutual (FM) Factory Mutual (FM) Housing Rating NEMA4 NEMA4 II 2 G Ex d IIC T6 IP66 II 2 D Ex tD A21 IP66 T85oC MECHANICAL Size 1.75 x 6.25 inches ( ...

372000-05 Rev J 6 1.3 Safety The IDD model flame detector heads’ voltage point is not accessible under normal operating conditions. However, users should follow appropriate electrical safety procedure when installing the flame detector. Electrical power should always be removed from the flame detector amplifier before instal ...

372000-05 Rev J 7 Section 2 Installation The IDD flame detectors determine the presence or absence of flame by monitoring the amplitude of the flame across a flicker frequency spectrum. The detector should initially be mounted so that the primary combustion zone is within the detector’s line of sight. The IDD detectors are u ...

372000-05 Rev J 8 flame detector should be sighted so it does not detect the igniter flame. 3. The detector should have an unrestricted view of flame as far as possible. Physical obstructions such as air register blades, interfering vanes, or other hardware should be cut away or notched so they do not fall within the detector� ...

372000-05 Rev J 9 Figure 4 Detector Location VS. Secondary air rotation 5. If combustion air enters the furnace with a rotational movement of sufficient velocity to deflect pilot flame in direction of rotation, position the detector 0 to 30 degrees downstream of the pilot burner and close to the periphery of the throat where t ...