User Manual

1-150.16
4
DESIGN BENEFITS
Unit Features - Horizontal Delivery Unit Heaters
Horizontal delivery unit heaters are the most popular of all types.
These units are ideal for heating buildings with large open areas
and low ceilings. They are used to counter heat loss along outside
building walls, especially where windows are present.
In addition to the features noted on page 2, features that enhance the
popularity of the horizontal delivery unit heater are:
• HSB units have top and bottom supply and return connections.
This permits the unit to be rotated 360° without piping changes.
• HC units have side supply and return connections.
This permits the unit to be installed in low clearance areas.
• HCH high efficiency units have side supply and return
connections. This permits the unit to be installed in low clearance
areas.
• Units have a 2-piece casing for easy coil access.
• All models have tapped holes for suspension by threaded rod or
optional pipe hanger adapter kit, except HSB 18 and HSB 24
which mount directly to and are supported by the supply and
return piping.
• Serpentine copper tube coil design has high resistance to thermal
shock, even under high steam pressures.
• Absence of coil headers eliminates potential leaks and increases
coil face area without increasing overall size of unit.
• Coil designed for greater water carrying capacity with lower
friction loss.
HSB MODEL
TOP/BOTTOM CONNECTIONS
HC MODEL
SIDE CONNECTIONS
Connections – Female type permits direct connection of unit heater to the piping and eliminates the need for additional
fittings.
Vertical Fins – Less opportunity for dust and dirt to collect. Reduces cleaning. Fins die-formed for added strength and heat
transfer.
Coil – All air passes through coil. Heating is uniform. Design assures maximum control over air delivery and temperature
of air leaving the heater. Aluminum fins die-formed for added strength – increased heat transfer. Fins mechanically
bonded to serpentine copper tube.
Motor – All motors are totally enclosed. Single phase and explosion-proof types include built in thermal overload
protection. Selected and tested for operation on specific unit heater models. All motor wiring is terminated in an electrical
junction box either supplied on the unit heater casing, or as an integral part of the motor.
Fan – Lightweight. Blades accurately balanced and pitched to move air quietly and positively – with minimum power
requirement.
Deflector Blades – Adjustable horizontal air-deflector blades are standard. Vertical blades are also standard on models
HC/HSB-258, HC/HSB-290 and HC/HSB-340 and are optional on other models. Both horizontal and vertical blades are
illustrated.
Safety Fan Guard – Standard equipment. Bolted to rear casing, steel rod fan guard completely surrounds the fan
offering constant protection.
Casings – Baked-on gray-green polyester or Hammertone Beige powdercoat paint is applied over rust-and corrosion-
resistance-treated steel
for long life.
Figure 4.1 - Unit Features
BOTTOM
CONNECTIONS
SIDE
CONNECTIONS
HCH MODEL
SIDE CONNECTIONS