Greenheck VSU-112 User Manual

Vertical Direct Gas-Fired Make-Up Air
Model VSU
• 800 – 60,000 cfm • up to 7,000,000 Btu/hr
November
2007
Product Features
Model VSU
Vertical Direct Gas-Fired Make-Up Air Unit
The VSU is specifically designed for providing heating and make-up air for manufacturing facilities and warehouses. Airflow volumes up to 60,000 cfm and heating capacities up to 7,000,000 Btu/hr. are offered.
Durable Construction
Designed for maximum weather resistance, VSU Housings are constructed of heavy gauge G90 galvanized steel. Lifting lugs are standard.
Direct Gas-Fired System
• Cast aluminum burners with stainless steel mixing plates
• Maxitrol burner modulation control
• Flame safeguard with digital fault indicator capability
• 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
• Separately fused motor
• 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.
2
Access Doors and Panels
Large access doors and panels are provided for easy inspection and maintenance of motors, drives, fan wheels, filters, and heater controls.
Centrifugal Blowers
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.
Factory Wired and Tested
All units are tested prior to shipment. Units are checked for vibration and proper operation.
Application
100% Make-Up Air
The 100% Make-Up Air system is recommended when outdoor air is required to replenish a constant volume of exhaust air. This system provides efficient heating of the make-up air and minimizes unwanted infiltration. Some of the most popular applications include paint booths, warehouses, kitchens and factories. Benefits of this system include low operating cost, low initial cost, simplicity and reliability. See page 5 for a wide range of factory supplied accessories.
Variable Volume System
The variable volume option is recommended when a building’s exhaust volumes are variable. This option enables the make-up air volume to track with the exhaust volume, providing only the amount of make-up air that is required.
The variable volume VSU saves energy in two ways. First, the fan power is reduced whenever make-up air requirements are less than the maximum. Second, whenever lower air volumes are sufficient, the VSU requires less gas to heat the outdoor air.
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.
Variable Frequency Drive controlled by a 2-10 VDC or 4-20 mA signal.
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.
Discharge Arrangements
For installation flexibility, fan discharges are available in either Horizontal or Upblast Discharge.
Horizontal Discharge
Upblast Discharge
3
Application
Recirculation System
The recirculation option is recommended when the ventilation equipment provides the primary source of heating for the space.
This option recirculates up to 80% of the supply air and efficiently heats it to maintain the desired space temperature. A minimum of 20% outdoor air is mixed with the recirculated air to provide a continuous source of fresh air.
Only outdoor air is used for combustion. This eliminates the possibility of contaminants in the recirculated air from crossing the burner.
Airflow Control Strategies
Greenheck offers four methods of controlling the recirculated air to outdoor air ratio. The ratio is determined by the outdoor air and recirculated air damper positions. The methods for adjusting damper positions are outlined below:
Modulating actuator controlled by building pressure.
Modulating actuator controlled manually with a remote potentiometer.
Two position actuator controlled manually with a remote switch.
Modulating actuator controlled by a 2-10 VDC or 4-20 mA signal.
In all cases, the fan provides a constant volume of supply air.
Burner By-Pass Damper
The recirculation 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.
Benefits vs Air Turnover
The recirculation system provides the space heating function with several advantages over indirect gas-fired air turnover units.
More Efficient - The recirculation direct fired burners are 100% efficient, compared to 80% efficient (maximum) for air turnover units.
Fresh Air - The recirculation system provides a continuous source of fresh outdoor air and positively pressurizes the building.
Outdoor Installation - Since the recirculation system is installed outdoors, valuable floor space is not lost.
4
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 (see examples at right). A terminal strip at the unit control center and remote panel simplify control wiring.
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.
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.
Basic remote control panel with thermostat for room temperature control option.
Lockable remote panel with room thermostat located inside the box. Keyed switch also for setting operation mode.
Room Control
Specify this option when the VSU 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.
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.
Additional Accessories
V-Bank Filters
Washable 2-inch aluminum mesh filters or 2-inch 30% efficient disposable filters are available.
Motorized Dampers
Intake or discharge dampers are available to prevent backdrafts when the fan is not in operation. Intake dampers are factory mounted and wired.
Fiberglass Insulation
Fiberglass insulation is used to line the housing to prevent the formation of condensation and to form an acoustical barrier.
Double Wall Construction
An interior metal liner is available to isolate the 1-inch fiberglass insulation from the airstream.
Freezestat
An on/off type discharge duct stat (with a timer) prevents the discharge of cold air into the building when the burner is not providing adequate tempering.
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.
Equipment Stand
The equipment stand raises the VSU intake above the ground to prevent debris, rain and snow from being drawn into the unit. The standard stand height is 24 inch, with other heights available.
Air Filter Gauge
The air filter gauge indicates when filters become dirty. An indicator light may be wall/beam mounted or provided with a remote control panel.
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 VSU maximum inlet gas pressure.
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.
Service Platform
A stable platform that provides easy access for servicing the unit.
5
Air Performance
Housing Size 20
Model CFM
2,600
VSU-112
VSU-115
3,500
4,400
4,000
5,250
6,500
Housing Size 30
Model CFM
6,500
VSU-118
VSU-120
8,000
9,500
9,000
10,500
12,000
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
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 559 608 657 703 747 792 BHP 3.2 3.7 4.2 4.6 5.2 5.7 RPM 606 648 691 734 775 813 BHP 4.5 5.0 5.6 6.1 6.7 7.3 RPM 655 695 732 770 807 844 BHP 6.2 6.8 7.4 8.0 8.6 9.2
TOTAL STATIC PRESSURE in inches of WG
0.75 1.00 1.25 1.50 1.75 2.00
TOTAL STATIC PRESSURE in inches of WG
0.75 1.00 1.25 1.50 1.75 2.00
Maximum
BHP
310
420
530
480
630
780
Maximum
BHP
850
1,045
1,240
1,170
1,375
1,375
Housing Size 40
Model CFM
14,000
VSU-218
VSU-220
18,000
22,000
20,000
24,000
28,000
TOTAL STATIC PRESSURE in inches of WG
0.75 1.00 1.25 1.50 1.75 2.00
RPM 612 672 726 779 BHP 5.0 5.7 6.5 7.4 RPM 691 738 788 836 881 923 BHP 8.7 9.6 10.6 11.6 12.6 13.6 RPM 787 825 865 902 944 985 BHP 14.3 15.4 16.5 17.5 18.8 20.0 RPM 575 621 667 711 752 791 BHP 8.3 9.3 10.3 11.4 12.5 13.7 RPM 636 677 716 755 792 830 BHP 12.6 13.9 15.1 16.3 17.5 18.9 RPM 703 739 774 809 841 875 BHP 18.4 19.9 21.3 22.8 24.2 25.6
Maximum
BHP
1,830
2,350
2,875
2,610
3,135
3,300
Housing Size 50
Model CFM
32,000
VSU-225
VSU-230
6
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.
38,000
45,000
44,000
52,000
60,000
RPM 446 482 515 548
BHP 12.1 13.8 15.4 16.9
RPM 491 523 553 582 610 638
BHP 18.0 19.8 21.9 23.9 25.7 27.5
RPM 547 575 603 629 655 679
BHP 27.4 29.5 31.6 33.9 36.3 38.7
RPM 401 429 456 483 509 535
BHP 16.8 18.9 21.2 23.7 26.3 29.0
RPM 446 470 494 516 539 562
BHP 24.9 27.3 29.8 32.2 35.0 38.0
RPM 494 514 535 556 576 596
BHP 36.2 38.3 40.9 43.9 46.7 49.5
0.75 1.00 1.25 1.50 1.75 2.00
TOTAL STATIC PRESSURE in inches of WG
Maximum
BHP
3,830
4,550
5,390
5,270
6,050
6,050
AAB
C
D
24 in. Min.
AAB
C
D
24 in. Min.
24 in. Min.
Dimensional Data
Housing Sizes
20 & 30
Housing Sizes
40 & 50
Housing Sizes
20 thru 50
PRESSURE DROP DATADIMENSIONS
Housing
Size
20 40 40 78 128
30 52 53 92 146
40 111 54 95 144
50 156 63 107 184
All dimensions are shown in inches.
A B C D
Housing
Size
20
30
40
50
CFM
2,500 0.11 0.02
6,500 0.17 0.09
6,000 0.12 0.03
12,000 0.20 0.10
14,000 0.14 0.05
28,000 0.28 0.16
30,000 0.14 0.04
60,000 0.28 0.15
30% Efficient Filter
Equipment Stand Height
The minimum distance from the ground to the filter intake is 24 inches. For housing size 50, the minimum distance is 48 inches. This minimizes debris and moisture from being entrained in the make-up air. In locations where heavy snow fall is common, this dimension may need to be greater. Specify the minimum clearance dimension when ordering.
2-inch
SIDE VIEWFRONT VIEW FRONT VIEW
Inlet
Damper
Gas
Burner
0.625
0.625
0.625
0.625
7
Typical Specifications
General: Make-up air unit shall be as manufactured by
Greenheck or approved equal provided all specifications are met. Greenheck Model VSU 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 -1999, CSA 3.7 - M99 (for 100% outdoor air) or ANSI Z83.18-2000 (for recirculation).
Gas Train and Controls: Direct gas-fired 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, requiring no caulking at job site. All components shall be easily accessible through removable doors.
Insulation: Unit casing to be lined with 1-inch fiberglass
insulation where specified. Insulation shall be in accordance with NFPA 90A and tested to meet UL 181 erosion requirements. Double wall shall be provided where specified.
Fan Section: Centrifugal fans shall be double width, double
inlet. Fan and motor shall be mounted on a common base and shall be internally isolated. All blower wheels shall be balanced. Ground and polished steel fan shafts shall be mounted in permanently lubricated ball bearings or ball bearing pillow blocks. 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 single speed 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 with exception of the larger evaporative cooling sections. 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, integral disconnect switch and terminal strip. Contactors, Class 20 adjustable overload protection and single phase protection shall be standard.
Filter Section: Filter section shall be
designed such that velocities across the filters do not exceed 550 feet per minute. Filters shall be 2-inch washable aluminum mesh or 2-inch disposable.
Weatherhood: Weatherhood shall be constructed of G90
galvanized steel with birdscreen mounted at the intake.
Recirculation (optional): Recirculation airflow shall be
controlled by adjustment of return damper position. Input signal for return damper shall be from building pressure sensors, potentiometer, external signal, or manual switch. Recirculated air shall not be permitted to pass across the burner. Return air shall be filtered.
Variable Volume (optional): Volume shall be varied by either
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 the burner to ensure proper gas combustion. Bypass damper shall operate automatically without an electronic signal.
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 • Catalog VSU Rev. 4 November 2007 SN
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