Modular Make-Up Air Unit
Model DGX
• Direct Gas-Fired Heating
• Evaporative • Chilled Water • DX Cooling
March
2007
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MODULE SELECTION OPTIONS
Module 1
INTAKE
Module 2
FILTER
Module 3
COOLING
Module 4
HEATING
Module 5
DISCHARGE
None
None
None
requires
Module 2, Option 2
Direct Gas Furnace
100% Outdoor Air
Downblast
Discharge
Birdscreen Weatherhood
requires
V-Bank Filters
Pleated or
Aluminum Mesh
*Cooling Coil – CW, DX
(standard capacity)
Direct Gas Furnace
Recirculation - requires
Module 2, Option 3
Horizontal
Discharge
Module 2, Option 2
Filtered
Weatherhood
80/20 Filtered
Recirculation
*Cooling Coil – CW, DX
(high capacity)
Direct Gas Furnace
Variable Air Volume
Upblast
Discharge
*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.
Louvered
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.
Weatherhood
•
•
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
Thru-Wall
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.
Evaporative
Cooling
3
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VARIABLE MAKE-UP AIR OPTIONS
Variable Volume
The variable volume option is recommended when a
building’s exhaust volume will vary. The make-up air
volume will track with the exhaust volume, providing
only the necessary amount of make-up air.
• 2 speed motor controlled manually with a remote
switch.
Burner By-Pass Damper
The Variable Volume option includes a patented
burner by-pass damper, which maintains the pressure
drop across the burner as air volumes change. This
assures that complete and proper combustion occurs.
The by-pass damper is self-adjusting, designed for
minimal maintenance, and requires no controls.
The variable volume option saves energy by reducing
both fan power and gas consumption whenever make-
up air requirements are less than the maximum.
Airflow Control Strategies
Greenheck offers four methods of controlling the
make-up air volume. All four vary the fan speed for
maximum energy savings.
• Variable Frequency Drive controlled by building
pressure.
• Variable Frequency Drive controlled manually with a
remote potentiometer.
Outside Air
• Variable frequency drive controlled by a 2-10 VDC
or 4-20 mA signal.
Supply Air
Recirculation
The recirculation option is recommended when the
ventilation equipment provides the primary source of
heating for the space.
• Modulating actuator controlled manually with a
remote potentiometer.
• Modulating actuator controlled by a 2-10 VDC or
4-20 mA signal.
Up to 80% of the air from the space can be
recirculated and filtered and then combined with a
minimum of 20% outdoor air for a continuous source
of fresh air. Only outdoor air is used for combustion to
eliminate the possibility of contaminants from the
recirculated air crossing over the burner.
• Two position actuator controlled manually with a
remote switch/time clock.
20%
Airflow Control Strategies
Greenheck offers four methods of controlling the ratio
of recirculated air to outdoor air via motorized
dampers.
80-0%
Outside Air
(100-20%)
Supply Air
Recirculated Air
(0-80%)
• Modulating actuator controlled by building pressure.
Temperature Control
There are three temperature control
options for heat: 1) Discharge Control, 2)
Space Control, and 3) DDC Interface
Control. Cooling controls are by others.
Room Control
Specify this option when the DGX has the primary
responsibility for controlling the room temperature. A
manually adjusted room thermostat provides feedback
to the unit controls, which vary the discharge
temperature in order to maintain desired room set
point.
Discharge Control
A factory installed modulating system
controls the gas valve to provide the
desired temperature based on a sensor
at the fan discharge. A room override
option is available to boost the discharge
temperature when the space is too cool.
DDC Interface Control
Allows for an external signal (0-10 VDC or 4-20 mA)
from the building management system to modulate
the burner output to satisfy monitored conditions.
4
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INSTALLATION OPTIONS
Roof Mounted Installation
Model DGX is available for stand alone installations as shown below. Downblast (Arrangement DB), upblast
(Arrangement UB), or horizontal (Arrangement HZ) discharge may be specified.
Horizontal Discharge - Arrangement HZ
Upblast Discharge - Arrangement UB
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.
Combination Package - Arrangement DBC
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
Note: Consult local codes and the authority
having jurisdiction if there are questions
concerning the use of this product.
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. It is also designed
to satisfy NFPA 96 requirements
- above the roof line - for
kitchen hood exhaust.
Thru-Wall Installation
Model DGX (Housing 12, 22, & 32 only) is available with a pre-engineered thru-wall installation option, which is
ideal when a roof penetration is not desirable.
Factory options that facilitate easy installation
and ensure problem-free operation:
Weatherhood: A full down turn design with
generous intake area to minimize intake velocity
and moisture entrainment.
Thru-Wall Sleeve: Sleeve provides attachment
interface between weatherhood and burner
section. Accommodates walls up to 15 inches in
depth.
Filter Section: Aluminum mesh media filters
outdoor air and strips fine mist from the air. A
drain pan weeps moisture out the front of the
wall sleeve.
5
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ACCESSORIES
Remote Control Panels
A wide variety of remote control panels are available. Specify the desired combination of switches, thermostats,
temperature selectors and indicator lights. A terminal strip at the unit control center and remote panel simplify
field control wiring.
Kitchen style remote panels
Basic remote control panel with
feature toggle switches and a
thermostat for room temperature
stainless steel face plate for
control option.
flush mounting to a wall. The
junction box is also included.
Accessories
Special Coatings
Spring Vibration Isolation
Spring blower vibration isolators are available in lieu of
neoprene isolators.
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.
Exhaust Fan Starter(s)
Exhaust fan starters are available factory mounted and
wired. Exhaust fan starters allow for an electrical
interlock between the supply and exhaust fan(s).
Roof Curbs
Factory provided roof curbs are available to ensure
compatibility between the make-up air unit and roof
curb. Standard construction is G90 galvanized steel.
Dirty Filter Switch
A dirty filter switch is available to monitor the pressure
drop across the filter section. If the pressure drop
across the filters is higher than the field adjustable
setting, the dirty filter switch trips indicating the need
to clean or replace the filters.
Duct Adapter
Duct adapter is available with factory supplied roof
curbs. The duct adapter allows for easy alignment of
the supply duct connection.
Freeze Protection
V-Bank Filter Section
Electronic freeze protection is available to
automatically shut down the supply fan when the
discharge temperature is below the adjustable set
point for an extended amount of time. This prevents
the unit from discharging non-tempered air into the
building and freezing pipes and other temperature
sensitive items.
V-bank filter sections are available with 2-inch
washable aluminum mesh or 2-inch 30% efficient
disposable filters.
Weatherhood
Three weatherhoods are available: standard
weatherhood includes birdscreen, filtered
weatherhood includes aluminum mesh filters, and
louvered intake hood includes a drainable blade
louver at intake with 2-inch aluminum mesh filters.
Inlet Air Sensor – Heat
The heating inlet air sensor will automatically turn the
heat on and off based on the outdoor air temperature.
Motorized Dampers
Discharge Diffuser
Intake or discharge dampers are available to prevent
backdrafts when the supply fan is not in operation.
Intake dampers are factory mounted and wired.
Discharge dampers ship loose for field mounting in the
supply air duct.
Discharge diffusers are available as either 3-way for
horizontal discharge or 4-way for downblast discharge.
Service Receptacle
A 115 volt GFCI outlet is mounted externally in a NEMA
3R box for the convenience of service personnel. A
separate 115 volt power source is required.
Fiberglass Insulation
One inch fiberglass insulation is available to line the
housing to prevent the formation of condensation and
to form an acoustical barrier.
Auxiliary Contacts
Normally open and normally closed contacts are
available for supply fan status and supply fan
interlocks.
Double Wall Construction
An interior metal liner is available to isolate the 1-inch
fiberglass insulation from the airstream.
6
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AIR PERFORMANCE
Blower
CFM
TOTAL PRESSURE in inches WG
Size
0.75
1109
0.26
1347
0.59
1014
0.45
1216
1.1
912
0.59
1097
1.4
761
0.7
939
2.1
681
1.3
850
3.5
609
2.1
736
4.9
590
4.0
763
10.9
605
8.3
720
15.2
563
9.8
643
15.9
451
11.6
525
19.6
-
1.00
1216
0.31
1445
0.68
1140
0.54
1306
1.3
1013
0.71
1172
1.6
1.25
1311
0.35
1530
0.75
1255
0.63
1397
1.4
1110
0.08
1244
1.7
1.50
1399
0.40
-
1.75
-
2.00
-
-
-
-
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
BHP
800
-
-
-
108
1,200
-
1361
0.73
1484
1.6
1199
0.10
1315
1.9
1460
0.84
1569
1.7
-
-
-
1,500
109
110
112
115
118
120
122
125
127
130
133
136
1648
1.9
-
2,400
2,000
-
-
1386
2.1
-
1455
2.2
-
3,000
853
0.9
934
1.0
1009
1.2
2,600
-
-
1006
2.4
756
1.5
1073
2.6
822
1.8
1137
2.9
892
2.1
1197
3.1
-
1254
3.3
-
4,400
4,000
-
-
906
3.9
668
2.5
960
4.3
724
2.8
1013
4.7
777
3.2
1062
5.1
-
1110
5.5
-
6,500
6,500
-
-
783
5.4
634
4.5
795
11.6
637
8.9
827
5.9
678
5.0
829
12.3
667
9.6
872
6.4
723
5.6
914
6.9
765
6.1
892
13.8
727
11.1
821
18.6
683
13.8
748
20.4
554
17.2
613
26.6
494
16.8
542
28.3
467
22.6
512
35.8
482
36.3
-
954
7.4
803
6.6
921
14.5
755
11.9
845
19.4
711
14.8
-
9,500
10,000
15,000
15,000
19,000
19,000
23,000
24,000
30,000
26,000
34,000
32,000
40,000
42,000
48,000
861
13.1
698
10.4
796
17.8
655
12.8
723
19.2
530
15.8
593
24.9
467
15.2
519
26.4
446
21.0
491
33.7
464
34.1
500
46.4
746
16.1
594
10.7
671
16.9
478
13.0
548
21.4
412
12.5
477
23.1
397
17.5
448
29.1
426
29.8
465
41.5
771
17.0
625
11.7
967
18.0
504
14.3
571
23.2
440
13.9
499
24.8
422
19.2
470
31.5
445
32.0
483
44.0
-
578
18.6
-
-
520
18.3
-
-
454
21.5
371
15.7
426
27.1
405
27.7
447
39.0
-
488
24.3
531
37.9
499
38.5
-
-
-
Note: The air performance data shown does not include internal static pressure losses due to items such as filters, dampers, and coils. For
exact air performance data based on specific unit configuration, use the Greenheck CAPS selection program.
7
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Typical Specifications
General: Make-up air unit shall be as manufactured by control transformer for 24 VAC circuit,
Greenheck or approved equal provided all specifications are integral disconnect switch and terminal
met. Greenheck Model DGX equipment is used as the basis of strip. Contactors, Class 20 adjustable
design. Performance to be as scheduled on plans. Make-up air overload protection and single phase
unit shall be ETL listed to ANSI Z83.4 -1999, CSA 3.7 - M99 (for protection shall be standard.
100% outdoor air) or ANSI Z83.18-2000 (for recirculation).
Filter Section: Filter section shall be
Gas Train and Controls: Direct gas-fired system shall have designed such that velocities across
a draw through design and field adjustable burner baffles. the filters do not exceed 550 feet per
Gas trains up to 400,000 Btu/hr shall include a direct spark minute. Filters shall be 2-inch washable
ignition system. Gas trains greater than 400,000 Btu/hr shall aluminum mesh or 2-inch disposable.
include a pilot ignition system and shall have digital coded
Weatherhood: Weatherhood shall be
fault indicator capability. Fault indicator shall provide service
constructed of G90 galvanized steel
history by storing codes for the last five faults. Dual safety
with birdscreen mounted at the intake.
shutoff valves shall be industrial duty and use 120 VAC control
Recirculation (optional): Recirculation
airflow shall be controlled by adjustment
of return damper position. Input signal
for return damper shall be from building
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
pressure sensors, potentiometer,
be G90 galvanized steel. Where top panels are joined there
external signal, or manual switch.
shall be a standing seam to insure positive weather protection.
Recirculated air shall not be permitted
All metal-to-metal surfaces exposed to the weather shall be
to pass across the burner. Return air
sealed, requiring no caulking at job site. All components shall
shall be filtered.
be easily accessible through removable doors.
Variable Volume (optional): Volume shall be varied by either
Insulation: Unit casing to be lined with 1 inch fiberglass
insulation where specified. Insulation shall be in accordance
withNFPA90AandtestedtomeetUL181erosionrequirements.
Double wall shall be provided where specified.
a 2-speed motor or variable frequency drive. Input signal for fan
speed shall be from building pressure sensors, potentiometer,
external signal, or manual switch. A self-adjusting burner
bypass damper shall maintain a constant air volume across
Fan Section: Centrifugal fans shall be double width, double the burner to ensure proper gas combustion. Bypass damper
inlet. Fan and motor shall be mounted on a common base and shall operate automatically without an electronic signal.
shall be internally isolated. All blower wheels shall be balanced.
Cooling Coil (optional): Direct expansion (DX) or chilled
Ground and polished steel fan shafts shall be mounted in
water coil shall be factory tested and rated in accordance
permanently lubricated ball bearings or ball bearing pillow
with ARI 410. Coils shall have copper tubes with permanently
blocks. Bearings shall be selected for a minimum (L10) life in
expanded aluminum fins, 12 fpi or less. DX coils shall be
excess of 100,000 hours at maximum cataloged speeds.
equipped with distributors to receive expansion valves at the
Motors and Drives: Motors shall be energy efficient, liquid connections. Drain pans shall extend at least 12 inches
complying with EPACT standards, for single speed ODP downstream of coil and be sloped to drain connection. Cooling
and TE enclosures. Motors shall be permanently lubricated, coil shall meet UL 1995 specifications for non-protected coil.
heavy duty type, matched to the fan load and furnished at the
Evaporative Cooling Section (optional):
Evaporative
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.
cooling section shall include a galvanized steel housing with
louvered intake, 2 inch aluminum mesh filters and a stainless
steel evaporative cooling module all provided by the make-up
air unit manufacturer. The louver shall be stationary type with
Electrical: All internal electrical components shall be prewired drainable blades, and be designed to withstand wind loads of
for single point power connection with exception of the larger 25 PSF. Evaporative cooling media shall be 12 inches deep,
evaporative cooling sections. All electrical components shall with a UL 900 class II fire rating for a cooling effectiveness of
be UL listed, recognized or classified where applicable and 90%. Drain and overflow connections shall be piped through
wired in compliance with the National Electrical Code. Control the side of the evaporative cooling section.
center shall include motor starter, control circuit fusing,
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 © 2007 Greenheck Fan Corp. • Catalog DGX Rev. 4 March 2007 SP
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