Greenheck Fan DGX User Manual

Modular Make-Up Air Unit

Model DGX

• Direct Gas-Fired Heating

• Evaporative • Chilled Water • DX Cooling

March

2007

PRODUCT FEATURES

Model DGX

Module 1, Option 2 Module 2, Option 2

Direct Gas-Fired
Make-Up Air Unit

The Greenheck model DGX is
a 100% efficient direct gas­fired heating and ventilating
unit. Chilled water, DX, and
evaporative cooling options
are also available for
combination heating and
cooling requirements.

The DGX is designed for
providing make-up air to
commercial and industrial
facilities. Airflow volumes
range from 800 to 48,000 cfm
with heating output capacities
up to 4,800,000 Btu/hr.

Direct Gas-

Fired Heat

Durable Construction

Designed for maximum weather resistance, DGX
housings are constructed of heavy gauge G90
galvanized steel. Lifting lugs are standard.

Direct Gas-Fired System

• High quality cast aluminum burners with
stainless steel mixing plates

• Maxitrol electronic
modulation burner
control

• Flame safeguard
with digital fault
indicator capability
(over 400,000 Btu/hr)

• 25:1 turn down ratio

Control Center

The control center includes the following standard
components:

• 24 volt control voltage

• Magnetic motor
starter with solid
state overload
protection

• Control
transformer

• Disconnect switch

• Distribution terminal strip

Premium grade control components are selected for
reliable operation. All electrical components are UL
Listed, recognized, or classified, and factory prewired
for single point power connection.

DGX shown with optional birdscreen

weatherhood, V-bank filter section

and horizontal fan discharge.

Module 4, Option 1

Module 5, Option 2

Vibration Isolators

The entire fan and motor
assembly is mounted on
neoprene vibration isolators to
minimize noise transmission
into the building. Spring
vibration isolators are
available in lieu of neoprene
isolators.

Reliable Fan Performance

Air performance ratings
from Greenheck’s
accredited test chamber
ensure accurate data.

Double width, double
inlet forward curved
wheels for high efficiency
and low sound levels are
constructed of heavy
gauge steel. Wheels are balanced to ensure vibration
free operation.

Access Panels

Large access panels are provided for easy inspection
and maintenance of motors, drives, fan wheels, filters,
and heater controls.

Factory Wired and Tested

All units are tested
prior to shipment to
ensure proper
operation of the gas
train, electrical
components, and
airflow controls.

2

MODULE SELECTION OPTIONS

Module 1

INTAKE

None

requires

Module 2, Option 2

Option 1

Option 2

Birdscreen Weatherhood

Option 3

requires

Module 2, Option 2

Filtered

Weatherhood

Module 2

FILTER

Module 3
COOLING

None None

V-Bank Filters

Pleated or

Aluminum Mesh

80/20 Filtered

Recirculation

*Cooling Coil – CW, DX

(standard capacity)

*Cooling Coil – CW, DX

(high capacity)

Module 4
HEATING

Direct Gas Furnace

100% Outdoor Air

Direct Gas Furnace

Recirculation - requires

Module 2, Option 3

Direct Gas Furnace
Variable Air Volume

Module 5

DISCHARGE

Downblast

Discharge

Horizontal
Discharge

Upblast

Discharge

Option 4

Weatherhood

Option 5

Option 6

Louvered

Thru-Wall

Evaporative

Cooling

*Chilled water or direct expansion (DX) cooling is available with the model DGX. The cooling section

includes the cooling coil, sloped stainless steel drain pan and insulated double wall construction.
Drain and coil connections are stubbed through the wall for convenience.

For proper coil sizing, use Greenheck CAPS selection software or contact your local representative.

Four row and six row chilled water or DX coils are available with airflow capacity up to 11,000 cfm.

Cooling coil sections are installed upstream of the fan section for a draw through arrangement and

provide a streamlined transition to adjacent DGX sections. DX coils require remote condensing units.

• Module 2 is not available with the Evaporative Cooler section (Module 1, Option 6)

• Cooling Coil modules (Module 3, Option 2 & 3) are not available with Recirculation (Module 2,
Option 3)

• Optional intake dampers available on Cooling Coil section (Module 3, Option 2 & 3)

• Module 1, Option 3, 4 & 5 are not available on Housing 35 and larger

The evaporative cooling section includes a galvanized steel housing with a louvered intake, 2 inch
aluminum mesh filters and a stainless steel evaporative cooling module. The evaporative cooling
media has a depth of 12 inches for 90% cooling effectiveness.

The entire section mounts directly to the front of the DGX unit, eliminating transition or ductwork
by others. Drain and overflow are conveniently tapped through the side of the cooling section. The
supply line connection is field located where convenient. Freeze protection, automatic drain & fill, and
water economizer (Water Wizard) options are also available.

Airflow capacity for evaporative cooling is up to 46,000 cfm. The evaporative cooling section for the
housing 32 and larger ship separately.

3