to 1494 Pa 0.5 to 6 inches water gage. Differential shall be a maximum of
37 Pa 0.15 inch water gage at the low end of the range and 87 Pa 0.35 inch
water gage at the high end of the range.]
2.10.3
Pneumatic Electric (PE) Switches
Switches shall have an adjustable setpoint range of 21 to 138 kPa (gage) 3
to 20 psig, and differential adjustable from [14 to 41] [7to 14] [2 to 7]
kPa [2 to 6] [1 to 2] [0.25 to 1] psi.
2.10.4
Solenoid Operated Pneumatic (EP) Valves
Valves shall have three-port operation: common, normally open, and
normally closed. Valves shall have an outer cast aluminum body. The air
connection shall be a 6 mm 1/4 inch NPT threaded connection. Valves shall
be rated for 345 kPa (gage) 50 psig where used in a control system which
operates at 172 kPa (gage) 25 psig or less, or 1034 kpa (gage) 150 psig
where used in a control system which operates in the range of 172 to 689
kPa (gage) 25 to 100 psig.
2.11
INDICATING DEVICES
Provide indicating devices.
2.11.1
Thermometers
a.
Thermometers for insertion in ductwork and piping systems shall
have brass, malleable iron, or aluminum alloy case and frame,
clear protective face, and permanently stabilized glass tube with
an indicating fluid column, white face, black numbers, and a 229 mm
9 inch scale.
b.
Thermometers for piping systems shall have rigid stems with
straight, angular, or inclined pattern.
c.
Thermometer stems shall have expansion heads as required to
prevent breakage at extreme temperatures. On rigid stem
thermometers, the space between bulb and stem shall be filled with
a heat transfer medium.
d.
Air duct thermometers shall have perforated stem guards and 45
degree adjustable duct flanges with locking mechanisms.
e.
Averaging thermometers shall have 90 mm 3.5 inch (nominal) dial,
with black legend on white background, and pointer traveling
through a 270 degree arc.
f.
Thermometers shall have an accuracy of plus or minus one percent
of scale range. Thermometers shall have the following ranges:
(1) Mixed air temperature: minus 18 to plus 38 degrees C in 1/2
degree C 0 to 100 degrees F in 1 degree F graduations.
(2) Return air temperature: minus 18 to plus 38 degrees C in 1/2
degrees C 0 to 100 degrees F in 1 degree F graduations.
(3) Cooling coil discharge temperature: minus 18 to plus 38
degrees C in 1/2 degree C 0 to 100 degrees F in 1 degree F
graduations.
SECTION 15901N
Page 30
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