42
Product Specifications
Contractor shall supply and install heavy duty wall mounted forced air electric heaters of the
wattage, voltage and phase as specified. The heater shall so be designed to provide an even
distribution of heated air to the space to be heated by drawing return air in the peripheral area of
the heater across and through the element which shall then be discharged from the center section of
the heater by means of an electric motor and axial flow fan blade. Heaters shall be recessed type to
extend no more than 1-1/2” from the finished wall or surface mounted to extend no more than 5-3/4”
from the finished wall or semi-recessed type to extend no more than 3-1/2” from finished wall or
semi-recessed type to extend no more than 2-1/2” from finished wall.
ENCLOSURE:
Heater front shall withstand 10.8 ft. lbs. (324 poundals) impact and 400 lbs. static force applied to
an 8 sq. in. area at center grille location with less than 1/16” permanent distortion. The combination
return and supply grille assembly shall be constructed of 1/16” x 3/8” rounded edge horizontal steel
louvers which shall be spaced for maximum opening of 1/4”. Louvers shall be welded at every
intersection to three evenly spaced 1/16” diameter vertical members and completely framed in a
heavy gauge natural anodized Aluminum extrusion. Front assembly shall be attached to the chassis
by hidden tamper-resistant (Allen-head) machine screws. All other parts shall be 16 gauge steel
Zinc coated, both sides finished in a high gloss or bronze colored baked powder coat finish.
MOTOR:
Motor shall be a permanently lubricated unit bearing, totally enclosed shaded pole type with
impedance protection. Motors shall operate at no more than 1400 RPM and shall be same voltage
as the heater. A protective shield shall surround the motor to separate return air from heated air.
PERFORMANCE:
Heaters shall have a rating of 245 CFM at 660 F.P.M. with a maximum temperature rise of 73°F.
ELEMENTS:
Element assemblies shall consist of two or three corrosion resistant steel sheathed type elements
mechanically bonded to common corrosion resistant steel fins. Each sheathed element shall consist
of helically coiled Nickel Chromium alloy resistant wire completely embedded in and surrounded
by Magnesium Oxide, enclosed and wedged into corrosion resistant steel sheaths. Elements shall
have 2” cold conductor pins extending into the sheath and shall have a density of no more than 60
Watts per inch.
THERMAL OVERLOAD:
Heaters shall be equipped with a “manual reset” thermal overload which disconnects elements
and motor in the event normal operating temperatures are exceeded. For safety, if opened due to
abnormal temperature, thermal overload shall remain open until manually reset. Automatic reset
thermal overloads which allow the element to continue to cycle under abnormal conditions will not
be accepted.
APPROVAL:
Heaters shall be ETL Listed.
OPTIONAL CONTROL SYSTEMS:
Heaters shall be operated fromwall-mounted, line voltage, heavy-duty (tamper-proof) thermostats.
Heaters with built-in, pre-wired contactors shall be operated from wall-mounted, line voltage, pilot
duty (tamper-proof) thermostats. Heaters built with, pre-wired contactors (and control transformers)
shall be operated from wall-mounted, pilot duty (24V) or (120V) wall-mounted tamper-proof
thermostats. Heaters shall be controlled by integrally mounted thermostats. Thermostats shall be
heavy-duty, hydraulic type with a range of 40°F to 80°F and with remote sensing bulb placed in the
return air. Thermostats shall be electrically rated at least 125% of heater rating. Thermostats
3420 & 3450 Series Heavy-Duty Fan Forced Wall Heaters
