Specifications - Lord and Son Construction, Inc.

A temperature limit switch (freezestat) shall be provided to sense the
temperature at the location shown. A sufficient number of temperature limit
switches (freezestats) shall be installed to provide complete coverage of
the duct section. Manual reset limit switches shall be installed in
approved, accessible locations where they can be reset easily. The
temperature limit switch (freezestat) sensing element shall be installed in
a serpentine pattern and in accordance with the manufacturer's installation
instructions.
3.2.9 Averaging Temperature Sensing Elements
Sensing elements shall be installed in a serpentine pattern located as
shown.
3.2.10 Air Flow Measurement Arrays (AFMA))
Outside Air AFMAs shall be located downstream from the Outside Air filters.
Pitot Tube AFMA shall not be used if the expected velocity measurement is
below 700 fpm or for outside airflow measurements.
3.2.11 Duct Static Pressure Sensors
The duct static pressure sensing tap shall be located at 75% to 100% of the
distance between the first and last air terminal units. If the transmitter
is wired in a homerun configuration to an AHU controller, the transmitter
shall be located in the same enclosure as the air handling unit (AHU)
controller(s) for the AHU serving the terminal units.
3.2.12 Relative Humidity Sensors
Relative humidity sensors in supply air ducts shall be installed at least 10
feet downstream of humidity injection elements.
3.2.13 Flowmeters
The minimum straight unobstructed piping for the flowmeter installation
shall be at least 10 pipe diameters upstream and at least 5 pipe diameters
downstream and in accordance with the manufacturer's installation
instructions.
3.2.14 Dampers
3.2.14.1 Damper Actuators
Actuators shall not be mounted in the air stream. Multiple actuators shall
not be connected to a common drive shaft. Actuators shall be installed so
that their action shall seal the damper to the extent required to maintain
leakage at or below the specified rate and shall move the blades smoothly.
3.2.14.2 Damper Installation
Dampers shall be installed straight and true, level in all planes, and
square in all dimensions. Dampers shall move freely without undue stress
due to twisting, racking (parallelogramming), bowing, or other installation
error. Blades shall close completely and leakage shall not exceed that
specified at the rated static pressure. Structural support shall be used
Section 23 09 23 Page 29