109990 - Tower Clock.pdf
PDF 89 KB Posted
- Attached to
- Kent Memorial Library Expansion
- Solicitation number
- 33247
- Issued by
- Litchfield County, Connecticut
About this file
This is a specifications document for a tower clock system installation at Kent Memorial Library, issued on October 15, 2025. The project requires the furnishing and installation of a complete clock system consisting of one tower clock unit and one remote control system. The tower clock shall feature a single sheet translucent milky-white acrylic dial with matte black markings, backlit with white 2700K LEDs with dimming capability below 10 percent. The clock movement must be Style C1G3-MI design with a 24VAC drive motor, 8-second maximum run time, and alternating hall effect switched closed loop minute impulse operation. The system shall include an aluminum bezel case (Style 6660) and a Type 99B-MI automatic reset control unit with IP65 enclosure rating for indoor and outdoor use. The basis of design specifies Electric Time Company, Inc. as the manufacturer, located at 97 West Street, Medfield, MA.
The control system must include a precision quartz time base with 4-minute-per-year maximum drift or optional GPS with no drift, an IP65-rated enclosure, automatic reset capability after power failures, automatic daylight savings time adjustment with a 100-year calendar, a 2-line 16-character backlighted LCD display, ETL listing to UL 863, power failure event logging, and configurable outputs including RS-232 and RS-485 ports with capability for up to 4 standard MI output clocks or 20 standard 24VDC RP output clocks. Installation must strictly adhere to manufacturer's instructions, with all conduit located within CMU cores to protect the elevator shaftway's fire rating. The electrical contractor shall provide all raceways, junction boxes, and conduit wire, coordinating with masonry sections to ensure proper core placement and solid filling where required.
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Text version
KENT MEMORIAL LIBRARY
10 99 90 – TOWER CLOCK
October 15, 2025
PART 1 GENERAL
1.01.1 Section Includes
A. 1. Tower Clock Components and Remote-Control System.
B. Related Sections
1. Basic Materials and Methods: All raceways, junction boxes, conduit wire to be provided by electrical contractor.
2. Coordinate with CMU Masonry: rated shaft must be clear: conduits to be in CMU cores.
PART 2 PRODUCTS
2.01 CLOCKS
A. Furnish complete clock system consisting of one tower clock and one remote control system.
B. Basis of Design: Manufacturer: Electric Time Company, Inc., 97 West Street, Medfield, MA, USA (508)-359-4396/(800)-531-2562 FAX (508)-359-4482. www.electrictime.com sales@electrictime.com
C. Tower Clock Components
Dial: Single sheet (not pieced) translucent milky-white acrylic.
Finishes: Dial markings to have a matte black finish, case, and hands to have a black polyurethane finish.
Hands: Type GS
Dial Markings: Type U1
Illumination: Backlit with white 2700K LEDs and their associated LED drivers. Driver to allow dimming below 10%.
Listing: Provide UL 48 listing on clock assembly
Movement: Style C1G3-MI Design. 24VAC drive motor and electronics. 8 second maximum run time.
Alternating hall effect switched closed loop minute impulse operation. Composite lubrication free bearing. Single source: Clock and movement to be manufactured by the same company.
Case: Aluminum bezel and case.
Style: Style 6660
D. Provide Type 99B-MI automatic reset control;
• IP65 Enclosure – Indoor & Outdoor Use
• Automatically resets clock after power failures.
• Automatically resets clocks for daylight savings time (if required)
KENT MEMORIAL LIBRARY
10 99 90 – TOWER CLOCK
October 15, 2025
• Precision Quartz Time base 4 minutes per year maximum drift.
• Optional GPS – no drift.
• Built in 100-year daylight savings time calendar.
• 2 Line 16-character backlighted LCD display.
• ETL listed to UL 863.
• Power Failure Event logging.
• Standard MI output – 4 clocks maximum standard
• Standard 24VDC RP output -20 clocks maximum
• Sweep Second hand output
• Hour Strike Capability.
• RS-232 and RS-485 output ports
• 24 VAC hour strike output – configurable pulse output
PART 3 EXECUTION
3.01 Installation
A. Inspect substrates, supporting items and related conditions, to ensure that they are ready to receive each item, prior to commencement of installation.
B. Install each item at locations indicated on drawings, as detailed, and in accordance with manufacturers’ instructions.
C. All conduit to be located within the CMU cores – coordinate with Masonry sections – the elevator Shaftway is rated and cannot have surface mounted utilities inside the shaft. Fill cores solid as required to protect the wiring and the shaft rating.
D. Strictly adhere to manufacturer’s installation instructions and recommendations.
END OF SECTION 109990
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