AEG CGA 75 WOK Specifications download pdf (Page 59)

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.

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AEG CGA 75 WOK Specifications Page 59

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