Greenheck Modular Make-Up Air Unit DGX User Manual

2
The Greenheck model DGX is
a 100% efficient direct gas-
fired 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.
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.
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.
Model DGX
Direct Gas-Fired
Make-Up Air Unit
DGX shown with optional birdscreen
weatherhood, V-bank filter section
and horizontal fan discharge.
Direct Gas-
Fired Heat
PRODUCT FEATURES
Module 1, Option 2 Module 2, Option 2
Module 4, Option 1
Module 5, Option 2

Greenheck Modular Make-Up Air Unit DGX Specifications

Gas Train and Controls

maximum gas train capacity	400, 000 Btu/hr
gas train ignition system	direct spark ignition
safety shutoff valve control signal	120 VAC

Fan Specifications

fan type	centrifugal
fan inlet type	double width, double inlet
fan bearing life	100, 000 hours

Cooling Coil

coil type	direct expansion or chilled water
coil fin density	12 fpi or less
drain pan extension	12 inches

Evaporative Cooling Section

evaporative cooling media depth	12 inches
evaporative cooling media fire rating	UL 900 class II
wind load resistance	25 PSF