Greenheck Modular Make-Up Air Unit DGX User Manual

3
MODULE SELECTION OPTIONS
Module 1
INTAKE
Module 2
FILTER
Module 3
COOLING
Module 4
HEATING
Module 5
DISCHARGE
Option 1
None
requires
Module 2, Option 2
None None
Direct Gas Furnace
100% Outdoor Air
Downblast
Discharge
Option 2
Birdscreen Weatherhood
requires
Module 2, Option 2
V-Bank Filters
Pleated or
Aluminum Mesh
*Cooling Coil – CW, DX
(standard capacity)
Direct Gas Furnace
Recirculation - requires
Module 2, Option 3
Horizontal
Discharge
Option 3
Filtered
Weatherhood
80/20 Filtered
Recirculation
*Cooling Coil – CW, DX
(high capacity)
Direct Gas Furnace
Variable Air Volume
Upblast
Discharge
Option 4
Louvered
Weatherhood
Option 5
Thru-Wall
Option 6
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.

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