T310 Fixed Temperature with Rate-of-Rise Heat Detector

The Models THD-7052 and THD-7053 Detectors are designed for operation with control units and releasing devices having specific voltage and current characteristics that are compatible with the detector circuitry. The Detectors are compatible with the Fenwal 732 control unit. The Fenwal 732 has three detection circuits which can support up to 25 detectors per circuit.

Please refer to Fenwal Document F-70-63 for UL Compatibility Listings with Fire Alarm Panels manufactured by others.

The Models THD-7052 and THD-7053 can be used with the detector base options and accessories in Table 2. Various base options are available to provide auxiliary relay and/or remote indication and remote test feature.

For UL/ULC applications, the Model THD-7052 and THD-7053 Detectors are listed to be installed on 70 foot (21.3 m) centers, typically on smooth ceilings up to 15 feet (4.6 m) high and will operate with minimum air circulation. Resultant maximum 4,900 square foot

(455.2 m2) spacing may be used as a reasonable guide for comparable applications.

For FM applications, the listed spacing is 35 feet (10.7 m) centers. Where special conditions exist (ceiling obstructions, etc.), reduced spacing must be used to achieve adequate protection.

For additional information, consult the Fenwal Automatic Fire Detection Application Engineering Manual MC-402, NFPA-72 and the local Authority Having Jurisdiction.

For detailed wiring diagrams with Fenwal 2- and 4-wire bases, please refer Fenwal Document 06-235056-001.

Detector bases are directly mounted on the electrical junction boxes (3-inch, 3-1/2-inch and 4-inch octagonal, 3-inch round or 4-inch square) (76 mm, 89 mm, 102 mm octagonal, 76 mm round or 102 mm square) without the need for any mechanical adapter required. Refer Fenwal Document 06-235056-001for additional details.

The detector bases also include a locking feature that prevents removal of the detector without use of a tool.

Testing shall be performed upon installation of the detector and once a year thereafter as stated in NFPA-72 latest edition.

All alarm signal devices, releasing devices, and extinguishing systems should be disengaged before the test is performed and re-engaged at the conclusion of testing. Detectors may be tested using a low power heat gun per instructions detailed in Fenwal Document 06-235056-001. Failure to alarm in this test indicates a detector requiring service.

The recommended requirement for detector maintenance consists of an annual cleaning of dust from the detector head by using the suction of a vacuum cleaner. Cleaning programs should be geared to the individual environment in conformance with NFPA 72.

The Models THD-7052 and THD-7053 Detectors are factory repairable only and have no field serviceable spare parts. No field repair should therefore be attempted. For service, return detector head intact to Kidde-Fenwal.

The contractor shall furnish and install where indicated on the plans, thermistor-based electronic Fixed Temperature with Rate-of-Rise of temperature detection feature Fenwal Model THD-7052 Heat Detectors. The contractor shall also furnish and install where indicated on the plans, thermistor-based electronic Fixed Temperature Fenwal Model THD-7053 Heat Detectors. The fixed temperature alarm set point of the THD-7052 and THD-7053 Detectors shall be 135°F (57°C) and the Rate-Of-Rise detection feature of the THD-7052 shall be rated at 15°F (8.3°C) per minute. The combination detector head and twist-lock base shall be UL Listed compatible with a UL Listed fire alarm control unit. The THD-7052 and THD-7053 Heat Detectors shall share interchangeable bases with the PSD-7157 Photoelectric Smoke Detectors and CPD-7054 Ionization Smoke Detectors.

The Fenwal Models THD-7052 and THD-7053 Heat Detectors shall have two Red LEDs located diametrically opposite each other so as to allow 360-degree viewing. The LEDs shall continuously indicate the operating condition of the Detector. During standby, the LEDs shall flash once every six seconds. During alarm, both LEDs shall light steady at full brilliance. A double flash every six seconds shall indicate a detector with a thermistor trouble. The detector may be reset by actuating the control panel reset switch. The vandal-resistant security locking feature shall be used in those areas as indicated on the drawings. The locking feature shall be field removable when not required.

It shall be possible to perform a functional test of the detector by using an appropriate heat source.

The Fenwal Models THD-7052 and THD-7053 Heat Detectors shall operate over an input voltage range from 10 to 33.5 Vdc. Voltage and RF transient suppression techniques Supplementary SPDT relays, remote test, and/or remote LED alarm indicators shall be installed where indicated.