2
WIRING DIAGRAMS
For detailed wiring diagrams with Fenwal 2 and 4-wire bases,
please refer Fenwal Document 70.104.
INSTALLATION
Detector bases are directly mounted on the electrical junction
boxes (3", 3.5" and 4" octagonal, 3" round or 4" square) without
the need for any mechanical adapter required. Refer Fenwal
Document 70.104 for additional details.
The detector bases also include a locking feature that prevents
removal of the detector without use of a tool.
TESTING AND MAINTENANCE
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 70.104. 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.
CAUTION
!
Do not attempt disassembly of the factory sealed
detector. This assembly is sealed for your protection
and should not be opened for servicing. Opening of
the detector will void its warranty.
SPARE PARTS
The Model THD-7052 and THD-7053 Detectors are factory re-
pairable only and have no field serviceable spare parts. No field
repair should therefore be attempted. For service, return detec-
tor head intact to Kidde-Fenwal.
ARCHITECT/ENGINEER SPECIFICATIONS
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 135F (57C) and the Rate-Of-Rise detection
feature of the THD-7052 shall be rated at 15F (8.3C) 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.
Table 1. Control Unit
Control Unit Compatibility
Identifier Number
Maximum Detectors per Loop
2210/2212
C10FE1
40
2410/2412
C10FE1
40
2320
C30FE1
15
3210
ZDM01, ZDMD01, VZM01
25
3220
C32FE1
40
Note: Please refer to Document 70.63 for compatiblity with other Fire Alarm Control Panels.
