Provision will be made to provide air to the space
in an amount equal to the exhaust.
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Heaters shall conform to the requirements of ANSI Z83.6 and shall be
[vented] [or] [unvented] type [as indicated]. [Vented heaters shall be
vented to the outside atmosphere.] Heater style shall be [surface
combustion][tubular] type [as indicated]. Reflector shape shall be
[parabolic] [horizontal] [or] [standard] [as indicated]. Heaters shall be
provided with space thermostats which control the unit's burner.
Thermostats located in the direct radiation pattern shall be covered with a
metal shield.
2.4
THERMOSTATS
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NOTE: Single stage thermostats are used to control
a unit at 100 percent capacity only. Two stage
thermostats can be used to stage a unit's capacity
to either 50 or 100 percent. Two stage thermostats
are only applicable for unit heaters and duct
furnaces.
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Thermostats shall be the adjustable electric or electronic type. Control
wiring required to complete the space temperature control system shall be
included. Thermostats shall have a [2 degree C 3 degree F] differential
and a set point range of [4 to 24 degree C 40 to 75 degrees F] [minus 18 to
plus 38 degrees C 0 to 100 degrees F] [27 to 49 degrees C 80 to 120 degrees
F]. Thermostats shall be the [single] [two] stage type.
2.5
VENT PIPING
Vent piping shall conform to the requirements of NFPA 54. Plastic material
polyetherimide (PEI) and polyethersulfone (PES) are forbidden to be used
for vent piping of combustion gases.
2.6
ELECTRIC AUTOMATIC VENT DAMPERS
Electric automatic vent dampers shall conform to the requirements of ANSI
Z21.66 and shall be provided in the vents of heaters [except unvented
infrared heaters] using indoor air for combustion air.
2.7
INSULATION
Insulation for piping and equipment and application shall be in accordance
with Section 15080A THERMAL INSULATION FOR MECHANICAL SYSTEMS.
2.8
FACTORY FINISHES
Equipment and component items, when fabricated from ferrous metal, shall be
factory finished with the manufacturer's standard finish.
PART 3
EXECUTION
3.1
INSTALLATION
Equipment shall be installed as indicated and in accordance with the
recommendations of the equipment manufacturer and the listing agency,
SECTION 15565A
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