TranSystems Corporation - LGM Construction

501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11
E. Application Specific Controllers shall communicate using LonTalk or BACnet MSTP.
2.7 AUXILIARY CONTROL DEVICES
A. Motorized dampers, unless otherwise specified elsewhere, shall be as follows:
1. Damper frames shall be 16 gauge galvanized sheet metal or 1/8" extruded aluminum with
reinforced corner bracing.
2. Damper blades shall not exceed 8" in width or 48" in length. Blades are to be suitable for
medium velocity performance (2,000 fpm). Blades shall be not less than 16 gauge.
3. Damper shaft bearings shall be as recommended by manufacturer for application.
4. All blade edges and top and bottom of the frame shall be provided with compressible
seals. Side seals shall be compressible stainless steel. The blade seals shall provide for
a maximum leakage rate of 10 CFM per square foot at 2.5" w.c. differential pressure.
5. All leakage testing and pressure ratings will be based on AMCA Publication 500.
6. Individual damper sections shall not be larger than 48" x 60". Provide a minimum of one
damper actuator per section.
B. Control dampers shall be parallel or opposed blade types as scheduled on drawings.
C. Electric damper/valve actuators.
1. The actuator shall have electronic overload or digital rotation sensing circuitry to prevent
damage to the actuator throughout the rotation of the actuator.
2. Where shown, for power-failure/safety applications, an internal mechanical, spring return
mechanism shall be built into the actuator housing.
3. All rotary spring return actuators shall be capable of both clockwise or counter clockwise
spring return operation. Linear actuators shall spring return to the retracted position.
4. Proportional actuators shall accept a 0-10 VDC or 0-20 ma control signal and provide a 2-
10 VDC or 4-20 ma operating range.
5. All non-spring return actuators shall have an external manual gear release to allow
manual positioning of the damper when the actuator is not powered. Spring return
actuators with more than 60 in-lb. torque capacity shall have a manual crank for this
purpose.
6. Actuators shall be provided with a conduit fitting and a minimum 1m electrical cable and
shall be pre-wired to eliminate the necessity of opening the actuator housing to make
electrical connections.
7. Actuators shall be Underwriters Laboratories Standard 873 listed.
8. Actuators shall be designed for a minimum of 60,000 full stroke cycles at the actuator's
rated torque.
E. Binary Temperature Devices
1. Low-Voltage Space Thermostats shall be 24 V, bimetal-operated, mercury-switch type,
with either adjustable or fixed anticipation heater, concealed set point adjustment, 55°F-
85°F set point range, 2°F maximum differential, and vented cover.
2. Line-Voltage Space Thermostats shall be bimetal-actuated, open-contact type or bellowsactuated,
enclosed, snap-switch type or equivalent solid-state type, with heat anticipator,
UL listing for electrical rating, concealed set point adjustment, 55°F-85°F set point range,
2°F maximum differential, and vented cover.
DIRECT DIGITAL CONTROL SYSTEM 15900-11