Filter
Top Products
2.5 COMBUSTION AIR AND VENTING COMPONENTS
A. Vent Box: e vent box shall be of [aluminized steel] [409
stainless steel].
B. Flue Fan: Each unit shall have a factory-installed ue fan to draw
combustion gases through the heat exchanger and into the ue
venting. No unit shall be gravity vented. e ue fan shall be
internally mounted by the manufacturer. No combustion dra
inducers shall be mounted outside of heater cabinet.
C. Combustion Air: For non-separated units, the combustion
air shall be drawn into the unit's exposed burner box directly
from the heated space through openings in the access door. For
separated units, the combustion air shall be drawn from outside
the heated space into the unit's enclosed burner box through
a piece of exible duct that terminates at an exterior cabinet
ange. Ductwork shall be run from that ange to the building
penetration.
D. Flue and Combustion Air Connections: e ue collar and
combustion air collar (if applicable) shall be located on the rear
of the unit. For Models 30 - 125, heater design shall allow for the
shiing of the venting and combustion air collars to the top of
the cabinet in the eld.
2.6 AXIAL FAN
A. Fan: Each unit is supplied with one (Models 30-250) / two
(Models 300-400) axial fan(s).
B. Fan Guard: Each axial fan is covered with a fan guard. e
guard shall protect against objects ½" (12 mm) and greater in
diameter.
C. Motor: e motor shall be an open drip-proof (ODP), standard
eciency design, wired for 120 V/ 1 Ø / 60 Hz. e motor shall
be shaded pole (SP) (Models 30 - 75) / permanent split capacitor
(PSC) (Models 100 - 400).
2.7 CONTROL SYSTEM
A. Factory Testing: e complete control system and burner
and gas manifold functions shall be factory tested for proper
operation and to simplify eld commissioning.
B. Control Enclosure: Burner controls (transformer, ignition
module, gas valve, safety switches) shall be internally
mounted by the manufacturer. No burner controls or gas train
components shall be mounted outside of heater cabinet.
C. Safety Controls:
1. Air Flow Switch: e air ow switch measures air pressure
dierential across the heat exchangers to verify blower
operation and the presence of an adequate supply of
combustion air. e gas valve cannot open until the air ow
switch is satised.
2. High Temperature Limit Switch: e high temperature limit
switch shall turn the burners o when air is discharged above
its set point. e switch ensures unit shut down in case of
axial fan failure or any problem which may result in
overheating.
D. Controls System: Units shall be equipped for use with 120 V /
1 Ø / 60 Hz power supply. All units shall be factory equipped
with a 24 V thermostat control terminal strip on the outside of
the cabinet, pre-wired to heater internal controls. ermostat
control terminal shall allow for 2-wire heating control or 4-wire
heating and “fan only” control.
2.8 OPTIONS AVAILABLE
(Select Applicable Options)
A. Shelf-Mounting Bracket Kit (Available for Models 30-125 Only):
e shelf-mounting bracket kit shall provide a manner in which
to mount a unit to an existing shelf.
B. Wall Suspension Mounting Bracket Kit (Available for Models
30-125 Only): e wall suspension mounting bracket kit shall
provide a wall-mounted structure from which a unit can be
suspended.
C. Wall Shelf Mounting Bracket Kit (Available for Models 30-125
Only): e wall shelf mounting bracket kit shall provide a wall-
mounted shelf structure on which a unit can be mounted.
D. Vertical Louver Kit (Available for Models 30-125 Only): e
vertical louver kit shall provide a means to control horizontal air
ow.
E. Concentric Vent Kit: e concentric vent kit allows the ue
and combustion air to be consolidated into a single concentric
vent, thereby minimizing the number of required wall/roof
penetrations. e kit consists of a concentric vent box, a 4" (101
mm)vent terminal with bae plate and a 6" (152 mm) (Models
30-250) / 8" (203 mm) (Models 300-400) combustion air
terminal.
F. Fuel Conversion Kit: e fuel conversion kit allows for
eld-conversion of the type of gas supplied to the unit. e
kit consists of a replacement spring for the gas valve and
replacement orices.
2.9 PERFORMANCE
A. See Schedule on plans.