2.3.4
Thermometers
Provide thermometers with a scale equivalent to 1.5 times the outlet water
temperature. Provide one located on supply water piping and one on return
water piping.
2.3.5
Drain Tapping
Provide drain valve and piping [to a floor drain] [to 150 mm 6 inches above
floor].
2.3.6
Make-up Water Station
2.3.6.1
Pressure Reducing Station
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NOTE: Select operating pressure required.
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Provide a water pressure-reducing valve and relief valve, or a combination
of the two in the makeup water line to the boiler to maintain a water
pressure of [_____] [83] kPa (gage) [_____] [12] psig in the hot water
system. Provide a 20 mm 3/4 inch globe valve by-pass around this valve.
2.3.6.2
Backflow Preventers
Section 15400 PLUMBING SYSTEMS.
Locate upstream of by-pass.
2.3.7
Stack Thermometer
Provide flue gas-dial type thermometer with scale calibrated from 66 to 399
degrees C 150 to 750 degrees F and mount in flue gas outlet.
2.3.8
Air Vent Valve
Provide with screwed connections, stainless steel disk, and stainless steel
seats to vent entrapped air from boiler.
2.3.9
Feedwater Treatment System
Provide in accordance with MIL-F-18113, Type II - shot-type feeder (manual,
intermittent feed), Style A - for use with pressure up to 1379 kPa (gage)
200 psig maximum.
2.3.10
Combustion Regulator
Provide adjustable temperature, thermostatic immersion type that shall
limit boiler water temperature to a maximum of 121 degrees C 250 degrees F.
Control shall actuate burner through an electric relay system to maintain
boiler water temperature within normal prescribed limits at loads within
rated capacity of boiler.
2.3.11
High Temperature Limit Switch
Provide immersible aquastat type with a temperature setting above that of
the combustion regulator and below that of the lowest relief valve setting.
Aquastat shall function to cause a safety shutdown by closing fuel valves,
shutting down burner equipment, activating a red indicating light, and
sounding an alarm in the event that boiler water temperature rises to the
SECTION 15515N
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