Brochure

2-116.7
3
ELECTRIC UNIT HEATERS
Horizontal air delivery unit heater type (HER series):
32 models, 8 sizes from 3 kW through 25 kW.
Recommended for buildings with low ceilings, they are equipped
with horizontal air deflector blades to adjust airflow either up
or down. Optional vertical deflector blades are also available
to deflect air to the right or left, providing complete directional
control over discharge of heated air. Horizontal delivery units
are normally placed around the perimeter of the building where
heat loss is greatest, so that the air stream from each heater
“wipes” the wall to produce a blanket of warm air along the
outside walls.
Vertical air delivery unit heater type (VE series):
21 models, 9 sizes from 5 kW through 50 kW.
Recommended for buildings with high ceilings are high and
where obstructions do not permit good horizontal movement
of air. Various optional air deflectors are available to produce
a variety of distribution patterns (see page 12). Vertical unit
heaters are usually oriented so that the heat spread from one
overlaps the heat spread of another unit heater.
Power-Throw
TM
unit heater type (PTE series):
3 models, 3 sizes from 15 kW through 50 kW.
For applications requiring heat throw greater than can be
provided by HER units, Power-Throw
TM
unit heaters should be
considered. For hard-to-heat areas, such as near frequently
opened loading dock doors or large warehouses, Power-Throw
TM
units are frequently an ideal choice. They are equipped with
horizontal air deflector blades to adjust airflow either up or
down. Due to the higher velocity of discharge air, their air
streams should not be directed at room occupants. A single
Power-Throw
TM
unit heater can often be used to replace as many
as three smaller horizontal delivery units, thereby reducing
equipment, installation, and maintenance costs.
Explosion Proof Horizontal Air Delivery Unit Heater Type
(HEX series):
26 model combinations, 9 sizes from 3 kW through 35 kW.
These horizontal heaters are designed for rugged industrial
applications in hazardous locations such as oil refineries,
petrochemical plants, pulp and paper mills, coal mines, grain
elevators, etc., where the possibility of explosion or fire exists
due to the presence of flammable gases, vapors, powdered
metals or dusts. Heaters are UL Listed for Class I, Divisions 1
& 2, Groups C and D; Class II, Division 1, Groups E, F and G,
and Class II, Division 2, Groups F and G. The UL temperature
code shall be T3B 329°F (165°C) for Class I and II, indicating
maximum operating surface temperatures. Before selecting
any heater for a particular application, refer to Article 500 of the
National Electric Code, as well as other applicable Standards.
Abbreviated descriptions of UL classes, groups, and divisions
are as follows.
Class I: Locations in which flammable gas or vapors may be
present, such as, but not limited to:
• GroupC:Atmospheressuchasethylene,alcohol,carbon
monoxide, or hydrogen sulfide.
• GroupD:Atmospheressuchasacetone,gasoline,natural
gas, propane or other gases or vapors of equivalent hazard.
Class II: Locations in which combustible dusts may be present,
such as, but not limited to:
• GroupE:Atmospherescontainingcombustiblemetaldust
regardless of resistivity or other combustible dust of similar
hazard characteristics.
• GroupF:Atmospherescontainingcarbonblack,charcoal,
coal or coke dust or dust of similar hazard characteristics.
• GroupG:Atmospherescontainingflour,starch,graindust
or dusts of similar hazards.
Division I: Location in which ignitable concentrations of
flammable material exist under normal operating conditions.
Division II: Locations in which flammable materials will
normally be confined within closed containers and escape only
in the case of abnormal conditions. Any equipment approved for
Division I is automatically also approved for Division II.
For further information, please consult the National Electric
Code (NEC) and National Fire Prevention Association (NFPA)
standards.
Low Installation Cost
Transformers, contactors and fuses are factory-furnished
and factory-wired when required. Terminal blocks facilitate
connection of power supply and control wiring. Modine
electric unit heaters are lightweight and require no special
reinforcement to suspend them.
Easy to Service
Fan and motor are exposed and can be removed without
lowering the unit heater. A hinged bottom panel permits full
access to controls on models HER, horizontal units. Vertical
delivery and Power-Throw
TM
models have separate control boxes
externally mounted on the units. Motors are totally enclosed,
permanently lubricated, and thermally protected. Electrical
contactors, fuses, and transformers are all safely enclosed in
control compartments.
Application Flexibility
Total Heating
Units can meet the total heating requirement in most industrial
plants, commercial and recreational buildings, and in special-
purpose structures such as animal shelters. The features that
make them the ideal selection for these types of buildings are a
long heat throw, uniform heat delivery and low installation and
maintenance costs. High up and out-of-the-way, unit heaters
provide heat into work areas for clean, safe, economical heating
comfort.
Supplemental Heating
They are ideal for spot heating applications during short
periods of occupancy in the area to be heated. In out-of-the-
way locations, remote from areas served by the building’s main
heating systems, electric unit heaters can often eliminate the
expense of extending gas, steam, or hot water lines.
Stand-by/Back-up Heating
Where fossil fuel supplies are interruptible or undependable,
electric unit heaters are recommended as a stand-by or back-up
heating system to supply comfort to an entire building or any
part of it.
Wide Range of Sizes and Types
WARNING
Before installing and operating heaters confirm location,
classification and properties of flammable vapors, liquids,
gases, dusts and fibers which may be present. Each room,
section or area should be considered individually.