2
Warnings and Installation Notes
1. Use of an outdoor rated initiating station is required with this heated enclosure.
2. When conducting periodic testing, if conditions are dusty or if you have wind
blown dust conditions, cover return grill ports to minimize entrance of dust or
sand particles. To remove accumulated dust or sand particles, use small
containers of compressed air that is used for electronic cleaning.
3. To reset the thermal circuit breaker push button.
If circuit breaker will not remain in a restored or closed position, conduct an
electrical check of the various components in the two voltage classes. The two
voltage classes are 24 VDC Negative Ground and 110 or 240 VAC 50-60 Hz with
connected electrical or earth ground. High voltage (110 or 240 VAC) wiring must
enter through bottom conduit. Low voltage and signaling wires must enter
through top conduit and remain separated per NFPA 70, NEC, and local codes.
4. If the thermal circuit breaker has tripped (opened circuit), the 110 or 240 VAC 50-
60 Hz power will still be energized up to the primary side of the thermal breaker.
For safety, disconnect supply power of conductors to three power circuits in the
enclosure.
5. To clean 24 VDC negative ground fan with electronic compressed air container,
disconnect all power.
Note: the 24 VDC negative ground fan will not operate if positive and negative
conductors are connected on the wrong terminals.
6. To minimize arid summer time heat build up in enclosure, install a dark color sun
shield with sides to provide shade for the enclosure. At the inclined face above
the enclosure at the point of contact with the building structure leave at least
1/2” or (1.25 cm) space. This will generate heat and cause an upward airflow
and help maintain the enclosure temperature approximately the same as
ambient air temperature.
7. The 110 or 240 VAC single phase 50-60 Hz heater does not require standby or
secondary power because the enclosure environment is supervised by a latching
supervisory circuit in the alarm control unit or panel.
8. Replacement of heater assembly and gasket is required five years from
installation date. Contact STI to order replacement Heater Kit STI-HK3.
9. All field wiring within this enclosure must be rated for a minimum operating
range of 0ºC - 110ºC.
The enclosure is used to protect UL Listed 38 and 2017 initiating devices at
temperatures down to -70˚F (-57˚C). It is the installer’s responsibility to comply
with NEC 70 Articles 725 and 760, NFPA 72, and other applicable fire and
electrical codes. Conduit or raceway paths need to be sealed as near to the
enclosure as possible. Installer should have maintained supervision over the low
temperature thermostat. The low temperature monitoring thermostat makes
the circuit at +32°F (0°C) and clears the circuit at +50°F (+10°C). This listing
requires that the fire alarm supervisory control module be only of the latching
type. On the appliance mounting plate is a label where you should record the
installation date. Also include below the serial number and installation date on
the instruction sheet for quick reference.
Serial Number ____________________ Installation Date ______________
NOTE: Operating voltage for the STI-1200A-HTR is 110 VAC. Operating
voltage for the STI-1200A-HTR240 is 240 VAC.
3
Polycarbonate Cleaning Instructions
Rinse with water to remove abrasive dust and dirt. Wash with soap or mild
detergent, using a soft cloth. Rinse once more, then dry with a soft cloth or
chamois. Exercise caution when using water inside enclosure. Make sure unit is
completely dry inside before reassembling. Do not use razor blades.
Specifications
Polycarbonate Enclosure:
Flammability: UL94 V-2
Wall Thickness: backbox: .20 inches (5.1mm)
cover: .12 inches (3.1mm)
NEMA Rating: 3R
Warranty: Lifetime against breakage in
normal use.
Silicone Laminate Heater:
STI-1200A-HTR 110 VAC 50/60 Hz UL Recognized Component
STI-1200-A-HTR240 240 VAC 50/60 Hz UL Recognized Component
100 Watts
Life: @ -10˚C (14˚F) ~ 70˚C (158˚F) 5 Years
Duty Cycle: -40˚F (-40˚C) 16%
-70˚F (-57˚C) 38%
-99˚F (-73˚C) 100%
Fan:
24 VDC (±10%), 90 mA UL Recognized Component
Life: 5 Years Continuous Duty
WARNING: The polarity of the circulating fan is important as it only
rotates in one direction with red lead being positive.
Gasket:
Material: Neoprene
Life: 5 Years
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