2.1.2.4
Controls
Include fan and limit switch, low voltage (24-volt) transformer, electronic
flame safeguard with flame safety relay, and electric spark ignition.
2.1.2.5
Accessories
Provide [power exhauster,] oil filter, oil pressure regulator, and
barometric damper.
2.1.2.6
Efficiency
Minimum steady state efficiencies shall be 81 percent at maximum rated
capacity and 78 percent at minimum rated capacity that is provided and
allowed by the controls.
2.1.3
[Steam] [or] [Hot-Water] Unit Heater
ASHRAE 33 tested for heating coils; UL listed for motor and controls.
2.1.3.1
Casing
Minimum [20] [_____] gage [steel] [or] [aluminum] with removable access
panels or means to remove, service, and maintain major components.
2.1.3.2
Coil
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NOTE: Use copper for maximum 517 kPa (gage) 75 psig
steam or maximum 163 degrees C 325 degrees F hot
water at 1379 kPa (gage) 200 psig, red brass for
maximum 1379 kPa (gage) 200 psig steam or 218
degrees C 425 degrees F hot water at 2068 kPa (gage)
300 psig, copper nickel for maximum 2758 kPa (gage)
400 psig steam or maximum 232 degrees C 450 degrees F
at 4136 kPa (gage) 600 psig, and steel for maximum
232 degrees C 450 degrees F hot water at 4136 kPa
(gage) 600 psig.
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Fin-and-tube coil constructed of [copper,] [red brass,] [90-10 copper
nickel,] [or ] [steel] tubes and [copper] [or] [aluminum] fins. Use
maximum design pressure of [steam at [_____] kilopascal (kpa (gage)) pounds
per square inch gage (psig)] [and] [hot water at [_____] kpa (gage) psig
and [_____] degrees C F].
2.1.3.3
Controls
[Automatic controls of [modulating] [on-off-auto] [or] [combination of
modulating and on-off-auto] system] [As indicated]. [Provide a
three-position selector switch.]
2.1.4
Electric Unit Heater
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NOTE: Check if Section 15768, "Electric Space
Heating Equipment," covers electric unit heater.
Recommend to cover unit heaters exclusively in this
section. Avoid redundant statement.
SECTION 15760N
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