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59UH-PRC002-EN
Mechanical
Specifications
Separated Combustion
Centrifugal and Propeller Fan
Gas Unit Heaters
General
Units are completely factory assembled,
piped, wired, and test fired. All units are
AGA Certified, 80 percent efficient and
conform with the latest ANSI Standards
for safe and efficient performance. Units
are provided with two-point suspension
hangers on propeller fan unit heaters
and with four-point suspension hangers
on centrifugal fan unit heaters. Units are
available for operation on either natural
or LP (propane) gas. Standard terms and
conditions apply.
Casing
Casings are die-formed, 20-gauge
galvanized steel and finished in baked
enamel. The bottom panel is easily
removed to provide service access to the
burners, pilot and orifice. All units
provided with independently adjustable
horizontal louvers with stops to prevent
total closure.
Heat Exchanger
Standard heat exchanger construction
consists of seam welded 20-gauge
aluminized steel tubes and 18-gauge
aluminized steel headers.
Burners
Burners are die-formed, corrosion
resistant aluminized steel, with stainless
steel port protectors. Port protectors
prevent scale or foreign matter from
obstructing the burner ports. Burners
individually removable for ease of
inspection and servicing. Each burner is
provided with an individually adjustable,
manually rotated air shutter adjustment.
Fans
Propeller fan blades are constructed of
aluminum with an aerodynamic contour.
All fans are dynamically balanced for
quiet, efficient operation and supplied
with a protective type fan guard. Rubber-
in-shear isolators provide isolation
between the fan/motor combination and
the unit heater casing.
Centrifugal fan is belt driven with
adjustable pitch motor sheave. Motor
and fan are dynamically balanced for
quiet operation.
Centrifugal Unit Motors
Standard motors are 115V, 60 Hz, single
phase, open drip-proof with built-in
thermal overload protection. Optional
230/60/1 motors are available on all
units. Optional 208, 230, 460/60/3 motors
are available on 125 through 400 MBh
units.
All Motors
All motors are 115V, 60 Hz, single-phase
open drip-proof with built-in thermal
overload protection and permanently
lubricated bearings.
Controls
A factory installed junction box is
provided for all power connections.
Standard units are provided with a 24V
combination single-stage redundant gas
valve, consisting of a combination pilot
solenoid valve, automatic electric gas
valve, pilot filter, pressure regulator, pilot
adjustment and manual shutoff. A flue
vent fan relay and combustion air
proving switch is also provided as
standard. Standard equipment includes
spark-ignited intermittent pilot system
with electronic flame supervision. A 24V
control transformer, high limit and fan
time delay relay are provided. The fan
time delay relay delays the fan start until
the heat exchanger reaches a
predetermined temperature. It also
allows the fan to operate after burner
shutdown, removing residual heat from
the heat exchanger.
Electronic Modulating
4-20 mA/0-10VDC Input
Provides modulated heat output. Ignition
is at full fire (100 percent input), and
modulates the gas input from 100
percent to 40 percent rated input.
The modulating gas valve shall operate
in response to a 4-20 mA or a 0-10 VDC
input from an external DDC control.
Flue Vent Fan
Flue vent fan provides power venting.
Provided factory assembled to a sealed
flue collection chamber. The flue vent fan
is activated in response to a low voltage
(24V) single-stage thermostat (NOTE: The
thermostat is not included with the gas
control option). A combustion air
pressure switch is provided as standard
to verify proper powered vent flow prior
to allowing the gas valve to operate.