AEG CGA 75 WOK Specifications download pdf (Page 57)

57UH-PRC002-EN

Mechanical

Specifications

High Efficiency Propeller and

Centrifugal Fan Gas Unit

Heaters

General

Units are completely factory assembled,

piped, wired, and test fired. All units are

AGA Certified 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. All units are available

for operation on either natural or LP

(liquid propane) gas.

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 orifices. The pilot is

also accessible through a side panel

access plate. 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.

The heat exchanger, burner and draft

hood assembly carry a non-prorated

warranty to be free from defective

material and workmanship for a period

of ten years from date of manufacture,

excluding loss due to misuse,

negligence, or corrosion by chemicals

precipitated in the air.

Burners

Burners are die-formed, corrosion

resistant aluminized steel, with stainless

steel port protectors. Port protectors

reduce 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

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.

All Motors

Standard motors are 115V, 60 Hz, single

phase, open drip-proof with built-in

thermal overload protection.

Optional Fan Unit Motors

All motors are 115V, 60 Hz, single phase

totally enclosed 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.

Two-Stage Gas Valve

(N/A on 30-75 MBh units)

Provides two stages of heat. Ignition is at

low fire (50% of the furnaces rated input).

Requires the use of a two-stage

thermostat.

Hydraulic Modulating Gas Valve

(N/A on 30-75 MBh units)

Provides modulated heat output. Ignition

is at low fire (50% input) and discharge

temperature sensing bulb located in the

air stream modulates the gas input from

100% to 50% rated input. Provided with

an automatic electric valve in series

which cycles the unit in response to a

low voltage single-stage thermostat

(thermostat not included).

Hydraulic Modulating Gas Valve with

Bypass

(N/A on 30-75 MBh units)

An additional electric valve in parallel

bypasses the hydraulic modulating

valve, overriding the discharge

temperature sensing bulb, allowing full

fire. Requires the use of a separate

thermostat to control the electric valve.

Electronic Modulating Gas Valve (Natural

Gas Units Only)

(N/A on 30-75 MBh units)

Provides modulated heat output. Ignition

is at full fire (100 percent input), and

modulates the gas input from 100 to 50

percent rated input. Available for use

with room thermostat or duct thermostat

with remote setpoint adjustment. Duct

thermostat available with optional

override room thermostat which causes

the unit to go to full fire when the room

temperature falls below the override

room thermostat.

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:

thermostat must be ordered.) 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 57

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