experience load variations due to time of occupancy.
For projects that involve only thermostatic furnace
controls, the designer should consider moving the
appropriate portions of specification Section 15951
to this paragraph.
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Furnace controls shall be provided by the furnace manufacturer as an
integral part of the furnace. Electronic controls shall be provided. The
controls shall allow for [single stage] [two stage] [variable speed]
operation. Controls shall be provided as specified in Section 15951 DIRECT
DIGITAL CONTROL FOR HVAC AND OTHER LOCAL BUILDING SYSTEMS.
2.5
AUTOMATIC VENT DAMPERS
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NOTE: Delete this paragraph if high efficiency
furnaces are specified.
**************************************************************************
Automatic vent dampers shall be provided in the vents of all gas burning
equipment that uses indoor air for combustion. Vent dampers shall conform
to ANSI Z21.66.
2.6
HUMIDIFIERS
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NOTE: Delete inapplicable paragraphs. Verify steam
availability if steam humidifiers are specified.
Recirculating or reservoir type will not be used
without automatic bleed where the supply water has a
mineral content greater than 4 grams per liter (0.53
ounces per gallon). Capacity shall be computed as
recommended by ARI 630 assuming average building
construction and single glass windows are used in
calculations.
**************************************************************************
2.6.1
Steam Spray Type
Steam spray humidifiers shall inject steam directly into the [surrounding
air] [or] [air stream] as indicated. [Single grid humidifiers shall
consist of a single copper distribution grid with pipe connection on one
end and cap on the other end. Automatic steam control valves and condenser
traps shall be field-installed.] [Enclosed grid shall be housed in a
copper enclosure with a build-in condensate drain connection. Exposed grid
shall be wick wrapped.] [Package type steam spray humidifiers shall be
equipped to trap out and to re-evaporate condensate and to supply dry steam
to a single distribution grid. Grid shall be steam jacketed and condensate
drained. Unit shall trap excess condensate to return system. Package type
steam spray humidifiers shall have modulating electric, electronic, or
pneumatic steam control valve, as indicated.] Steam spray humidifiers
shall be rated for humidifying capacity in kg pounds of steam per hour and
at steam pressure as indicated.
2.6.2
Steam Diffuser Type
Diffuser units shall be of a design that will separate any condensate from
steam supply and provide positive drain of condensate to waste and supply
SECTION 15566A
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