2.1.1.3
Burners
Die-formed, slot ports, and steel construction with aluminum paint.
2.1.1.4
Draft Diverter
All-welded steel construction and an integral part of each heat exchanger
section. Allows backdrafts to bypass burner assembly without affecting
normal operation.
2.1.1.5
Controls
Consisting of a combination pressure regulator, [two-stage gas valve in 100
percent and [55] [_____] percent of full rating,] main shutoff valve, pilot
cock, pilot safety switch for 100 percent shutoff, high temperature limit
switch, and time-delay fan switch. Include power and control connections
in an integral junction box.
2.1.1.6
Efficiency
Minimum steady state efficiencies shall be 78 percent at maximum rated
capacity and 75 percent at minimum rated capacity that is provided and
allowed by the controls.
[2.1.1.7
Accessories
**************************************************************************
NOTE: Do not acquire propane-gas conversion kit for
project locations where it is not cost effective to
use propane gas as fuel. Delete this paragraph if
not required.
**************************************************************************
Provide [propane-gas conversion kit] [automatic electric pilot recognition
kit].
]2.1.2
Oil-Fired Unit Heater
UL 731 and UL labeled.
2.1.2.1
Casing
Minimum [22] [_____] gage [aluminum] [or] [[enamel] [or] [vinyl] coated
steel]. Provide removable access door.
2.1.2.2
Minimum 16 gage primary combustion chamber constructed of [perlite-clad
steel] [, aluminum-clad steel] [, or] [400 series stainless steel]; minimum
14 gage secondary heating section composed of aluminized, mild, or
hot-rolled steel. Provide a flame observation port on the burner side of
the heater.
2.1.2.3
Burner
Provide pressure oil-atomizing burner with mechanically forced draft,
suitable for fuel oil No. 2. Provide two-stage oil pump. Equip burner
motor with a combustion air damper.
SECTION 15760N
Page 7
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