Installation and Service Manual

1-550.26
OPERATION
7
Connections — Female-type permits direct connection of unit heater to the
piping. HC models have copper connectors at side of the unit.
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 types include built-in
thermal overload protection. All motor wiring is terminated in an electrical junction
box either supplied on the unit heater 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.
Safety fan guard — Standard equipment. Bolted steel rod fan guard completely
surrounds the fan offering constant protection.
Deflector blades — Adjustable horizontal air-deflector blades are standard
— vertical blades are standard on Models HSB-258, HSB-290 and HSB-340 and
are optional on other horizontal models.
Casings — Electrostatically applied, gray-green polyester powder coat paint
finish is applied over rust- and corrosion-treated steel for long life.
Motor-Cooling Cone — Shields
motor from coil heat — prolongs life
of insulation, windings, and lubricant.
Prolongs motor life.
Coil — Aluminum fins mechanically
bonded to tubes for maximum heat
transfer. All steam- and water-
carrying passages between heavy
steel pipe connections are copper, or
cupronickel.
Motor — All motors are totally
enclosed. Single phase types include
built-in thermal overload protection.
Fan — Accurately balanced to
operate quietly and at lowest possible
power consumption.
Junction Box — Easier installation
with single point electrical connection.
Motor easily removable — Modine
design permits motor to be removed
through opening below the unit
— especially important where heaters
are installed close to ceiling.
Vertical fins — Less opportunity for
dust and dirt to collect. Exposed for
easy cleaning with air hose and brush.
Casings — Electrostatically applied,
gray-green polyester powder coat paint
finish applied over rust- and corrosion-
treated steel lasts longer.
Figure 7.1
Horizontal Delivery Unit Cutaway
Figure 7.4
Vertical Delivery Unit Cutaway
Figure 7.2
Typical Horizontal Unit with Standard Junction Box
Figure 7.3
Horizontal Unit with Optional Fingerproof Fan Guard