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Direct Gas-Fired Heating
Model DG
• 800 to 15,000 cfm • Up to 1,600,000 BTU/hr
Optional Evaporative Cooling
January
2005
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PRODUCT FEATURES
Durable Construction
Designed for maximum weather resistance, DG
housings are constructed of heavy gauge G90
galvanized steel. Lifting lugs are standard.
Model DG
Direct Gas-Fired
Make-Up Air Unit
The Greenheck model DG is a 100%
efficient direct gas-fired make-up air unit.
Evaporative cooling is also available for
combination heating and cooling
requirements.
The DG is designed to provide make-up air to
commercial and industrial facilities with process
exhaust. Air flow volumes range from 800 to 15,000
cfm with heating capacities up to 1,600,000 BTU/hr.
Direct Gas-Fired System
Greenheck’s direct gas-fired make-up air units
feature:
• High quality cast aluminum
burners with stainless steel
mixing plates
• Maxitrol burner
modulation 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:
• Magnetic motor
starter with solid
state overload
protection
• Control transformer with fusing
• Integral door interlocking 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 vibration isolators to minimize
noise transmission into the building.
Reliable Fan
Performance
Air performance ratings
from Greenheck’s
AMCA registered 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 statically and dynamically 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. Units
are checked for
proper operation
of the gas train,
electrical
components and
airflow.
Direct Gas-Fired
Heat
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Stand Alone Arrangements
The model DG is available for stand alone installations with a downblast (Arrangement DB) or horizontal
(Arrangement HZ) discharge.
Downblast Discharge - Arrangement DB Horizontal Discharge - Arrangement HZ
Combination Package - Arrangement DBC
The combination curb extension is the
component that pulls the Combination
Package together, providing a factory
engineered interface between the roof curb
and the fans.
With a standard 12 inch roof curb, louvered
weatherhood, and Greenheck Model CUBE
exhaust fan, the combination curb extension
will ensure compliance to the above NFPA 96
requirements.
Note: Consult local codes and the authority having
jurisdiction if there are questions concerning the use of
this product.
Roof Curb
Combination Curb Extension
INSTALLATION
®
Combination Packages
The Greenheck combination package
simplifies installation and reduces field
labor costs. The pre-engineered
design ensures that the supply fan,
exhaust fan, curb, and combination
extension components interface
properly for kitchen ventilation
applications.
Equally important, Greenheck
combination packages are specifically designed to
comply with NFPA 96.
NFPA 96 states:
• Exhaust duct must terminate at least 24 inches
above the roof deck
• Fan discharge must be at least 40 inches
above the roof deck
• Air intake shall have a horizontal separation of
10 feet from the exhaust discharge
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Filter Section
Weather
Hood
Roof Curb
Duct Adapter
Discharge
Damper
ACCESSORIES
V-Bank Filter Section
A V-bank filter section is standard on units with a
birdscreen weatherhood. Specify either 2 inch washable
aluminum mesh filters or 2 inch disposable filters.
Weatherhoods
Birdscreen, louvered or filtered weatherhoods with standard G90 galvanized steel construction are available.
Duct Adapter
Provides easy means for attaching ductwork to curb and
allows installation of top section of duct prior to setting
the unit on the curb.
Roof Curb
Factory provided roof curbs are available to ensure
compatibility between the make-up air unit and roof curb.
Standard construction is G90 galvanized steel and
includes 1inch insulation.
Discharge Damper
A discharge damper prevents both backdrafts when the fan
is not in operation and condensation inside the unit during
cold weather conditions. A wide variety of backdraft and
control dampers are available for field installation.
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The optional 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 is Munters GLASdek and has a
depth of 12 inches for 90% cooling effectiveness.
The entire section mounts directly to the front of the DG 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 the Water Wizard™ evaporative
optimizer are also available.
The birdscreen weatherhood
features a wire mesh intake, which
prevents large debris from
damaging the filters. An additional
filter section is required.
The filtered weatherhood
includes aluminum mesh filters
mounted in the intake,
eliminating the need for an
additional filter section.
The louvered weatherhood
includes a louvered intake and
aluminum mesh filters in a
compact design that requires
no additional filter section.
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ACCESSORIES
®
Exhaust Fan Starter(s)
Up to 2 exhaust fan starters may be added to the
make-up air control center.
Air Filter Gauge
Indicates when filters become dirty. An indicator light
may be wall/beam mounted or provided with a
remote control panel.
Intake Dampers
Motorized intake dampers are available to prevent
backdrafts when the fan is not in operation. Intake
dampers are factory mounted and wired.
Fiberglass Insulation
One inch fiberglass insulation is used to line the
housing, preventing the formation of condensation
and forming an acoustical barrier.
Freeze Protection
An on/off discharge duct stat (with a timer) prevents
the discharge of cold air into the building if the
burner is not providing adequate tempering.
Propane Gas
A propane heater may be provided in lieu of
natural gas.
Double Wall Construction
An interior metal liner is available to isolate insulation
from the airstream. Fiberglass insulation is included
with this option.
Inlet Air Sensor
An on/off type duct stat automatically de-energizes
the gas system and interrupts the flow of gas to the
burner when the inlet air temperature is above the
desired setting.
Gas Pressure Regulator
Required if building gas line pressure exceeds the
maximum inlet gas pressure of the make-up air unit.
Ships separately for field installation.
Special Coatings
Greenheck’s Permatector coating is available for a
durable, long lasting finish. Decorative paints are also
available in a variety of colors to match existing
building fixtures. Consult your Greenheck
representative for paint selections.
115 Volt GFCI Service Receptacle
A 115 volt GFCI outlet is mounted externally in a
NEMA 3R box for the convenience of field service
personnel. A separate 115 volt power source is
required.
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A wide variety of remote control panels are available. Specify the desired
combination of switches, thermostats, temperature selectors and
indicator lights. Keyed switching is also available. Number-to-number
wiring between the make-up air unit and the remote panel simplify
required field wiring.
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Discharge Temperature Control
Control of discharge air temperature is accomplished
with a factory installed sensor located at the fan
discharge. A Maxitrol 14 system modulates the gas
valve to provide the desired discharge temperature.
Room Override
The room override option, available with
the Maxitrol 14 system, boosts the
discharge temperature when the space
temperature is too cool. Discharge
sensor is factory installed. Room sensor
may be wall/beam mounted or included
on a remote control panel.
Room Temperature Control
Specify this option when the DG has
the primary responsibility of
controlling the room temperature. A
room mounted thermostat senses
the room temperature and provides
feedback to the Maxitrol 44 control
system which modulates to satisfy
the room temperature setting.
The thermostat is manually adjustable to the desired
room temperature. The room thermostat may be
wall/beam mounted or included on a remote control
panel.
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800 120
1,000 150
1,200 180
1,500 225
1,950 295
2,400 365
2,000 305
2,500 380
3,000 400
6,500 990
8,000 1220
9,500 1450
10,000 1525
12,500 1600
15,000 1600
RPM 609 668 724 777
BHP 2.1 2.5 2.8 3.2
RPM 668 721 772 819 864 910
BHP 3.3 3.7 4.2 4.6 5.0 5.5
RPM 736 783 827 872 914
BHP 4.9 5.4 5.9 6.4 6.9
RPM 590 634 678 723 765 803
BHP 4.0 4.5 5.0 5.6 6.1 6.6
RPM 672 711 748 784 820 855
BHP 6.9 7.5 8.1 8.7 9.3 10.0
RPM 763 795 829 861 892 921
BHP 10.9 11.6 12.3 13.1 13.8 14.5
RPM 761 853 934 1009
BHP 0.7 0.9 1.0 1.2
RPM 839 920 993 1065 1133 1195
BHP 1.3 1.5 1.7 1.9 2.1 2.3
RPM 939 1006 1073 1137 1197
BHP 2.1 2.4 2.6 2.9 3.1
RPM 681 756 822 892
BHP 1.3 1.5 1.8 2.1
RPM 757 823 884 943 998 1049
BHP 2.2 2.5 2.8 3.2 3.5 3.8
RPM 850 906 960 1013 1062
BHP 3.5 3.9 4.3 4.7 5.1
DG-120
DG-118
Housing 30
CFM
Maximum
MBH
0.75 1.00 1.25 1.50 1.75 2.00
TOTAL STATIC PRESSURE in inches of WG
MODEL
DG-112
DG-115
2,600 395
3,500 530
4,400 670
4,000 610
5,250 800
6,500 800
CFM
TOTAL STATIC PRESSURE in inches of WG
Maximum
MBH
0.75 1.00 1.25 1.50 1.75 2.00
Housing 20
MODEL
DG-108
DG-109
CFM
TOTAL STATIC PRESSURE in inches of WG
Maximum
MBH
0.75 1.00 1.25 1.50 1.75 2.00
Housing 10
MODEL
DG-110
AIR PERFORMANCE
RPM 1109 1216 1311 1399
BHP 0.26 0.31 0.35 0.40
RPM 1228 1325 1415 1500 1579
BHP 0.41 0.47 0.53 0.59 0.65
RPM 1347 1445 1530
BHP 0.59 0.68 0.75
RPM 1014 1140 1255 1361 1460
BHP 0.45 0.54 0.63 0.73 0.84
RPM 1102 1210 1312 1411 1504
BHP 0.73 0.86 0.97 1.1 1.2
RPM 1216 1306 1397 1484
BHP 1.1 1.3 1.4 1.6
RPM 912 1013 1110 1199
BHP 0.59 0.71 .084 .096
RPM 995 1082 1166 1247 1325
BHP 0.93 1.1 1.2 1.4 1.5
RPM 1097 1172 1244 1315 1386
BHP 1.4 1.6 1.7 1.9 2.1
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All dimensions are shown in inches.
*Based on largest available CUBE exhaust fan.
All dimensions are shown in inches.
*The birdscreen weatherhood requires an additional filter section. The additional filter section is optional with the
filtered or louvered weatherhood.
A max.
10 ft. min.
B max.
24 in. min.
40 in. min.
A
B
C
D
Housing
A* B* Width
Size
H10 159
1
⁄2 47 351⁄2
H20 1723⁄4 573⁄4 50
H30 199 631⁄4 583⁄4
DIMENSIONAL DATA
®
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Housing
Size
A
B* C D Width
Filtered Louvered Birdscreen*
H10 313⁄4 271⁄2 261⁄4 273⁄4 781⁄4 333⁄4 28
H20 343⁄4 301⁄4 321⁄4 301⁄4 861⁄4 333⁄4 37
H30 651⁄4 331⁄4 281⁄4 33 1013⁄4 421⁄2 48
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TYPICAL SPECIFICATIONS
Our Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from the purchase
date. Any units or parts which prove defective during the warranty period will be replaced at our option when returned to our factory,
transportation prepaid. Motors are warranted by the motor manufacturer for a period of one year. Should motors furnished by
Greenheck prove defective during this period, they should be returned to the nearest authorized motor service station. Greenheck
will not be responsible for any removal or installation costs.
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice.
Greenheck P.O. Box 410 • Schofield, WI 54476-0410 • Phone (715) 359-6171 • greenheck.com
Copyright © 2005 Greenheck Fan Corp. • DG Rev. 3 January 2005 SP
Typical Specifications
General: Make-up air unit shall be as
manufactured by Greenheck or approved equal
provided all specifications are met. Greenheck
Model DG equipment is used as the basis of
design. Performance to be as scheduled on plans.
Make-up air unit shall be ETL listed to ANSI Z83.4
and CAN 3.7.
Gas Train and Controls: Direct fired gas system
shall have a draw through design and field
adjustable burner baffles. Gas trains up to 400,000
Btu/hr shall include a direct spark ignition system.
Gas trains greater than 400,000 Btu/hr shall include
a pilot ignition system and shall have digital coded
fault indicator capability. Fault indicator shall
provide service history by storing codes for the last
five faults. Dual safety shutoff valves shall be
industrial duty and use 120 VAC control signals.
Temperature control shall incorporate a Maxitrol
electronic modulation control system.
Unit Casing and Frames: Unit shall be of internal
frame type construction of galvanized steel. All
frames and panels shall be G90 galvanized steel.
Where top panels are joined there shall be a
standing seam to insure positive weather
protection. All metal-to-metal surfaces exposed to
the weather shall be sealed. All components shall
be easily accessible through removable or hinged
doors.
Optional Insulation: Unit casing to be lined with
1 inch fiberglass insulation. Insulation in
accordance with NFPA 90A and tested to meet UL
181 erosion requirements and secured to unit with
water proof adhesive and permanent mechanical
fasteners. Double wall construction is optional.
Fan Section: Centrifugal fans shall be double
width, double inlet and forward curved. Fan and
motor shall be mounted on a common base and
shall be internally isolated. All blower wheels shall
be statically and dynamically balanced. Ground
and polished steel fan shafts shall be mounted in
permanently lubricated ball
bearings (up to size 118) or ball
bearing pillow blocks (size 120
and larger). Bearings shall be
selected for a minimum (L10) life
in excess of 100,000 hours at
maximum cataloged speeds.
Motors and Drives: Motors
shall be energy efficient,
complying with EPACT standards
for ODP and TE enclosures.
Motors shall be permanently
lubricated, heavy duty type,
matched to the fan load and
furnished at the specified voltage,
phase and enclosure. Drives shall
be sized for a minimum of 150% of driven
horsepower. Pulleys shall be cast and have
machined surfaces, 15 horse power and less shall
be supplied with an adjustable drive pulley.
Electrical: All internal electrical components shall
be prewired for single point power connection. All
electrical components shall be UL listed,
recognized or classified where applicable and
wired in compliance with the National Electrical
Code. Control center shall include motor starter,
control circuit fusing, control transformer for 24
VAC circuit and integral door interlocking
disconnect switch. Contactors, Class 20 adjustable
overload protection and single phase protection
shall be standard.
V-Bank Filter Section: Filters shall be mounted in
a V-bank arrangement such that velocities across
the filters do not exceed 550 feet per minute. Filters
shall be easily accessible through a removable
access panel.
Weather Hood: Weather hood shall be
constructed of G90 galvanized steel.
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