hinged duct access doors to install averaging sensors if needed.
c.
Locate freeze protection sensors in appropriate locations to sense
lowest temperatures, to avoid potential problems with air
stratification. Lowest horizontal pass shall be not more than 300
mm 1 foot above bottom tube of coil.
3.1.3.3
Immersion Temperature Sensors
Provide thermowells for sensors measuring temperatures in liquid
applications or pressure vessels. Locate wells to sense continuous flow
conditions. Do not install wells using extension couplings. Where piping
diameters are smaller than the length of the wells, provide wells in piping
at elbows to sense flow across entire area of well. Wells shall not
restrict flow area to less than 70 percent of pipe area. Increase piping
size as required to avoid restriction. Provide thermowells with thermal
transmission material within the well.
**************************************************************************
NOTE: Designers should show the OA temperature
sensor on the north side of the building. This
location should be shown on the mechanical floor
plan drawings.
**************************************************************************
3.1.3.4
Outside Air Temperature Sensors
Provide outside air temperature sensor in weatherproof enclosure on north
side of the building, away from exhaust hoods, air intakes and other areas
that may affect temperature readings. Provide sun shields to from direct
sunlight.
3.1.4
Damper Actuators
Actuators shall not be mounted in the air stream.
3.1.5
Thermometers
Provide thermometers at locations indicated.
Mount thermometers to allow
reading when standing on the floor.
3.1.6
Differential Pressure Sensors
a.
Duct Static Pressure Sensing: Locate duct static pressure tip
approximately two-thirds of distance from supply fan to end of
duct with the greatest pressure drop.
b.
Pumping Proof with Differential Pressure Switches: Install high
pressure side between pump discharge and check valve.
c.
Steam Pressure Sensing: Install snubbers and isolation valves on
steam pressure sensing applications.
d.
Variable Speed Control: The cycle time and characteristics of the
input signal from the differential pressure sensors shall be fully
compatible with the variable speed controller. Coordinate the
requirements with the provided associated equipment.
SECTION 15910N
Page 58
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