Product Specification Guide
ModelVSU– Packaged Make-Up Air Unit with Direct Gas-Fired Furnace For Outdoor or Indoor Installation
CSI MasterFormat Category 23 74 XX

************************************************************************************************************************Note to User: This document is subject to copyright protection and is proprietary to Greenheck Fan Corporation. However, Greenheck Fan Corporation authorizes the user a limited non-exclusive license to use this document or portions of it for the purpose of preparing written product specifications for the above CSI MasterFormat category. All information in this document as provided by Greenheck Fan Corporation is informational in nature and is provided without representation or warranty of any kind as to the user or any other party, including, without limitation, ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, OR NON-INFRINGEMENT. To the greatest extent permitted by applicable law, Greenheck Fan Corporation assumes no liability, and User assumes all liability and risk, for the use or results from the use of this document or the information contained herein, whether as modified by the user or not. Users should consult www.greenheck.com to verify that this document represents the most current version.

Specifier Notes: This product specification guide is written in accordance to the Construction Specifications Institute (CSI) Format - 2004 Edition.

This section must be carefully reviewed and edited by the Engineer to meet the requirements of the project and local building code. Coordinate with other specification sections and the drawings.

Delete all unnecessary “Specifier Notes” when editing this section.

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1.	GENERAL
1.1	SUMMARY
A.	This section includes units with integral Direct Gas-Fired heating for [rooftop] [outdoor] [indoor] installation. Airflow arrangement shall be [Outdoor Air only] [Outdoor Air with Variable Air Volume] [Outdoor Air with Recirculation]. Each unit shall be constructed in a vertical configuration and shall incorporate additional product requirements as listed in Section 2 of this specification. If unit is intended for installation on a concrete slab, verify design requirements and construction responsibility for the slab. 
B.	Related sections include the following:
1.	Section 22 0000: Scope of Work
2.	Section 22 0100: General Provisions
3.	Section 22 0700: Insulation
4.	Section 22 1000: Plumbing
5.	Section 23 0900: Controls and Instrumentation
6.	Section 23 0000: Electrical
Include any other applicable specification divisions.

1.2	SUBMITTALS (This section should include all data needed by A/E to verify suitability of product for each application. As a minimum, it should include CAPS data and IOM).
A.	Product Data: For each type or model include the following:
1.	Complete fan performance curves for Supply Air, with system operating conditions         indicated, as tested on an AMCA Certified Chamber.
2.	Sound performance data for Supply Air, as tested on an AMCA Certified chamber.
3.	Motor ratings, electrical characteristics and motor and fan accessories.
4.	Dimensioned drawings for each type of installation, showing isometric and plan views, to include location of attached ductwork and service clearance requirements.
5.	Estimated gross weight of each installed unit.
6.	Installation, Operating and Maintenance manual (IOM) for each model.
7.	[Microprocessor Controller (DDC) specifications to include available options and operating protocols. Include complete data on all factory-supplied input devices]. If unit is to be controlled by a BMS, verify compatibility of operating protocol. See also: “Operating Protocol” in this document.
8.	[Remote Panel description to include all functions] Note: You may specify a Remote Panel in lieu of a Microprocessor Controller. 
9.	 [Color chart including a palette of available standard paint finishes]. 

1.3	QUALITY ASSURANCE
A.	Source Limitations: Obtain unit with Integral [Heating] with all appurtenant components or accessories from a single manufacturer.
B.	Product Options: Drawings must indicate size, profiles and dimensional requirements of unit and are to be based on the specific system indicated. Refer to Division 1 Section “Product Requirements.”
C.	Certifications
1.	Entire unit shall be ETL Certified per ANSI Z83.4 or ANSI Z83.18 and bear an ETL mark.

1.4	COORDINATION
A.	Coordinate size and location of all building penetrations required for installation of each MAU and associated ducting, plumbing and electrical systems.
B.	Coordinate sequencing of construction of associated plumbing, HVAC and electrical supply [roofing contractor].

1.5	EXTRA MATERIALS
A.	Furnish extra materials described below that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.
1.	Filters: [(Insert quantity) set(s) of Aluminum or MERV 8 or MERV 13 or MERV 14 disposable filters for each unit]. 

2.	PRODUCTS
2.1	MANUFACTURERS
A.	Available Manufacturers: Subject to compliance with specifications contained within this document, manufacturers offering products that may be incorporated into the work include, but are not limited to:
1.	Greenheck

2.2	MANUFACTURED UNITS Indicate major components that must be included as part of the unit.
A.	Unit with Integral Heating be fully assembled at the factory and consist of an insulated metal cabinet, [motorized intake damper] [and motorized recirculating damper], [sensors], [curb assembly], [service receptacle], [freeze protection], filter assembly for intake air, supply air blower assembly and an electrical control center. All specified components and internal accessories factory installed and tested and prepared for single-point high voltage connection. 
	
2.3	CABINET 
A.	Materials: Formed, [single wall metal cabinet] [single wall metal cabinet with fiberglass duct liner insulation] [double wall insulated metal cabinet] Double wall insulated metal cabinet should be specified if LEED credits are desired or in specific applications where even minor erosion of insulation is unacceptable, such as food processing facilities, fabricated to permit access to internal components for maintenance. [Underside of unit shall have formed metal panels covering base panel insulation]. Typically ordered when the unit is installed indoors, in an elevated position and the foil-faced underside insulation is visible.
1. 	Outside casing: 18 gauge, galvanized (G90) steel meeting ASTM A653 for components that do not receive a painted finish. [Pre-painted components as supplied by the factory shall have polyester urethane paint on 18 gauge G60 galvaneal steel]. Base rail is 12 gauge, galvazined (G90) steel.  Note: pre-painted polyester on G60 galvanized steel provides highest corrosion resistance. [Components that receive a painted finish per A/E specification shall be of 18 gauge type A60 galvaneal steel and shall be painted with a baked industrial enamel finish]. [Components that receive a painted finish per A/E specification shall be painted with a polyester urethane powder coat]. Note: higher corrosion-resistant finishes such as “Hi-Pro Polyester” are available for use in coastal areas or installation in corrosive atmospheres such as wastewater treatment plants. An excellent reference on protective coatings can be found at: http://www.greenheck.com/library/articles?s=performance+coatings&c=&am=1&ay=1995&bm=12&by=2015 
2. 	Internal assemblies: 24 gauge, galvanized (G90) steel except for motor supports which shall be minimum14 gauge galvanized (G90) steel.
B. 	Cabinet Insulation: Comply with NFPA 90A and NFPA 90B and erosion requirements of UL 181.
1. 	Materials: Fiberglass insulation. If insulation other than fiberglass is used, it must 	also meet the Fire Hazard Classification shown below.
a.	Thickness: 1 inch (25 mm)
b.	Fire Hazard Classification: Maximum flame spread of 25 and smoke developed of 50, when tested in accordance with ASTM C 411.
c.	Location and application: [Full interior coverage of entire cabinet to include walls and roof of unit shall be semi-rigid type and installed between inner and outer shells of all cabinet exterior components when double walls are specified]. [Full interior coverage from “Heating on”] 
C. 	Access panels: Unit shall be equipped with [insulated] [removable] [hinged] access panels to provide easy access to all major components. Access panels shall be fabricated of 18 gauge galvanized G90 steel. Removable access panels shall incorporate a formed drip edge. Specific type of steel and finish should match “Cabinet Materials” above.
D.	Supply Air blower assembly: Blower assembly consists of an electric motor as specified by A/E and a belt driven, double width, and double inlet forward curve blower. Assembly shall be mounted on heavy gauge galvanized rails and further mounted on [minimum 1.125 inch thick neoprene vibration isolators] [spring isolation devices]. 
E.	Control center / connections: unit shall have an electrical control center where all high and low voltage connections are made. Control center shall be constructed to permit single-point high voltage power supply connections.
F.	Direct Gas-Fired Furnace:
1.	Shall be factory assembled, piped and wired direct gas-fired system of 92% efficiency with a draw through design and field adjustable burner baffles with a [pilot] [direct spark] ignition system.
2.	Shall have a cast aluminum burner manifold and stainless steel mixing plates. No air from the inside space shall be allowed to pass across the burner at any time. Flame rectification shall be provided by a [flame rod] [ultra-violet scanner]. [A flame safeguard display shall be included]. Burner control shall have a digital coded fault indicator capable of storing the last five faults.
3.	Shall be equipped for operation on [natural gas] [LP gas] with a maximum rated inlet gas pressure of [1/2 psi] [5 psi]. [Gas pressure regulator shall be provided]. 
4.	Shall have fault sensors to provide fault conditions to optional digital controller or building controls.
5.	Shall have temperature control provided by an electronic 25:1 turndown-ratio modulating discharge air sensor. [Discharge Temperature Regulated: Amplifier to include a low fire time delay potentiometer / room temperature controller]. [Room Temperature Regulated: Amplifier to include a low fire time delay potentiometer, sensitivity potentiometer, minimum discharge air temperature potentiometer and maximum discharge temperature potentiometer] [Direct digital controller with integral discharge temperature limit using an external [2 - 10 VDC] [4 - 20 mA] signal].
6.	Shall include the following safety controls:
a.	Manual Reset, High Limit Switch: Main gas valve closes if high-limit temperature is exceeded.
b.	Dual safety shutoff valves shall be provided that do not exceed 120 VAC control signals.
c.	High [and low] Gas Pressure Switch: Main gas valve closes if high [or low] pressure switch faults.
d.	Minnesota code: Includes high and low gas pressure switches, hydro type gas valves and proof of close valves.
e.	FM global requirements: Include high and low gas pressure switches and visual indication gas valves.
f.	[One] [Two] hydraulic proof of close valves(s) shall be included.
g.	A gas vent line shall be included that vents gas from between the safety shutoff valves.
h.	Visual indication: Clear visual signal demonstrating the position of the main gas safety shutoff valves.
i.	Indicate any other requirements such as furnace output, controls, etc.
G.	[Motorized dampers / Intake Air: Motorized damper of [low leakage] [insulated low leakage] type shall be factory installed].
H.	[Motorized Recirculating Air Damper designed to permit 80% recirculation of exhaust air shall be factory installed. Damper shall be controlled by [manual switch] [time clock] [potentiometer] [building pressure control] [external 2-10 vdc] [external 4-20mA]]. Controls are supplied by Greenheck as part of a Remote Panel. Assign responsibility for installation of panel and indicate location of panel. It is also possible to control the recirculating air function by means of a BMS, without using factory-supplied controls (external 2-10 vdc or external 4-20mA).
I.	[Sensors are considered to be part of various optional operational modes or device controllers and are to be factory supplied and installed as specified by the A/E]. See IOM / Sensors Installed by Factory.
J.	[Service receptacle: 120 VAC GFCI service outlet shall be factory-provided and installed by this contractor in a location designated by the A/E]. Service outlet requires a dedicated single phase electric circuit.
K.	[Freeze protection for optional water coil] Freeze protection consists of an adjustable temperature sensing bulb that will disable the fan motor. Freeze protection is not a substitute for draining of water-filled coils.

2.4	BLOWER 
A.	Blower section construction, Supply Air: Belt drive motor and blower shall be assembled onto a minimum 14 gauge galvanized steel platform and must have [neoprene vibration isolation devices, minimum of 1 – 1/8 inches thick] [helical coil spring vibration devices].
B.	Blower assemblies: Shall be statically and dynamically balanced and designed for continuous operation at maximum rated fan speed and horsepower.
C.	Centrifugal blower housing: Formed and reinforced steel panels to make curved scroll housing with shaped cutoff. 
D.	Forward curved blower (fan) wheels: Galvanized or aluminum construction with inlet flange and shallow blades curved forward in direction of airflow. Mechanically attached to shaft with set screws.
E.	Blower section motor source quality control: Blower performance shall be factory tested for flow rate, pressure, power, air density, rotation speed and efficiency. Ratings are to be established in accordance with AMCA 210, “Laboratory Methods of Testing Fans for Rating.”	

2.5	MOTORS
A.	General: Blower motors greater than ¾ horsepower shall be “NEMA Premium™” unless otherwise indicated. Compliance with EPAct minimum energy-efficiency standards for single speed ODP and TE enclosures is not acceptable. Motors shall be heavy-duty, permanently lubricated type to match the fan load and furnished at the specified voltage, phase and enclosure. Drives shall be sized for a minimum of 150% of driven horsepower and pulleys shall be fully machined cast-type, keyed and fully secured to the fan wheel and motor shafts. Electric motors of ten horsepower or less shall be supplied with an adjustable drive pulley. Comply with requirements in Division 23 05 13, matched with fan load. 
B.	Motors shall be Select one [60 cycle, 3 phase 208 volts] [60 cycle, 3 phase 230 volts] [60 cycles, 3 phase 460 volt] [60 cycle, 3 phase 575 volts]. The designation “NEMA Premium™” applies to electric motors with efficiencies that are “better than EPAct.” The terms “high efficiency” or “premium efficiency” have no industry definitions. An excellent explanation of motor efficiencies and designations can be found at: http://www.copper.org/applications/electrical/energy/motor_text.html 

2.6	UNIT CONTROLS
A.	The unit shall be constructed so that it can function as a stand-alone heating and cooling system controlled by factory-supplied controllers, thermostats and sensors or it can be operated as a heating system controlled by a Building Management System (BMS). [This unit shall be controlled by a factory-installed microprocessor programmable controller (DDC) that is connected to various optional sensors]. Note: if unit is to be connected to a BMS, a factory-installed DDC controller is required. If there is no BMS, either a DDC controller, a remote panel or controls by others must be specified. If a remote panel is specified, make certain that any needed control switches are included in the remote panel.
B.	[Unit shall incorporate a DDC controller with integral LCD screen that provides text readouts of status, operating settings and alarm conditions. DDC controller shall have a built-in keypad to permit operator to access read-out screens and change settings without the use of ancillary equipment, devices or software. DDC controllers that require the use of equipment or software that is not factory-installed in the unit are not acceptable. Alarm readouts consisting of flashing light codes are not acceptable]. Note: some manufacturers are known to incorporate DDC controllers that require the use of separately-purchased handheld hardware or a PC and/or software to view or change settings. Owner-specified ventilating conditions can be input by means of pushbuttons. 
1.	[Operating protocol: The DDC shall be factory-programmed for [LonWorks] [BACnet MSTP] [BACnet IP] [Modbus RTU] [Modbus IP] for monitoring of the unit’s status]. Specify protocol. 
2.	[Operating protocol: The DDC shall be factory-programmed for [LonWorks] [BACnet MSTP] [BACnet IP] [Modbus RTU] [Modbus IP] for monitoring of the unit’s status and control of the unit’s functions]. Specify protocol. 
C.	[Variable Frequency Drive (VFD)] [unit shall have factory installed variable frequency drives 	        for modulation of the blower motors The VFDs shall be factory-programmed for unit-specific 	          requirements and shall not require additional field programming to operate]. 
D.	[Remote Interface: Contractor shall provide and install a Remote Interface that functions as a remote indicator of owner-selected operating parameters and also permits remote inputting of new operating parameters. Each remote panel shall have a large LCD user interface screen similar in form and function to the screen on the DDC. Installed location of room display shall be as indicated on the plans]. Note: only one remote interface per unit is available. See illustration on Addendum A.
E.	Sensors to be provided with the unit
1.	[Room / Space Temperature Sensors]
2.	[Heating Inlet Air Sensor]
3.	[Dirty Filter Sensor]
4.	[Fire Stat Type III]
5.	[120V/24V Smoke Detector]

2.7	FILTERS
A.	Unit shall have [2” thick permanent metal filters] [2" thick MERV 8 disposable pleated filters] [2" thick MERV 13 disposable pleated filters] [4" thick MERV 14 disposable pleated filters] located in the outdoor air intake and shall be accessible from the exterior of the unit. 

3.	EXECUTION
3.1	EXAMINATION
A.	Prior to start of installation, examine area and conditions to verify correct location for compliance with installation tolerances and other conditions affecting unit performance. See unit IOM.
B.	Examine roughing-in of plumbing, electrical and HVAC services to verify actual location and compliance with unit requirements. See unit IOM.
C.   Proceed with installation only after all unsatisfactory conditions have been corrected.

3.2	INSTALLATION
A.	Installation shall be accomplished in accordance with these written specifications, project drawings, manufacturer’s installation instructions as documented in manufacturer’s IOM, Best Practices and all applicable building codes.

3.3	CONNECTIONS
A.	In all cases, industry Best Practices shall be incorporated. Connections are to be made subject to the installation requirements shown above.
1.	Piping installation requirements are specified in Division 22 (Plumbing). Drawings indicate general arrangement of piping, fittings and specialties. 
2.	Duct installation and connection requirements are specified in Division 23 of this document.
3.	Electrical installation requirements are specified in Division 26 of this document. 

3.4	FIELD QUALITY CONTROL
A.	Manufacturer’s Field Service: Engage a factory authorized service representative to inspect field assembled components and equipment installation, to include electrical and piping connections. Report results to A/E in writing. Inspection must include a complete startup checklist to include (as a minimum) the following: Completed Start-Up Checklists as found in manufacturer’s IOM. Insert any other requirements here.

3.5	START-UP SERVICE
A.	Engage a factory authorized service representative to perform startup service. Clean entire unit, comb coil fins as necessary, and install clean filters. Verify water source for compliance with manufacturer’s requirements for flow and temperature. Measure and record electrical values for voltage 	and amperage. Refer to Division 23 “Testing, Adjusting and Balancing” and comply with provisions therein.

3.6	DEMONSTRATION AND TRAINING
A.	Engage a factory authorized service representative to train owner’s maintenance personnel to adjust, operate and maintain the entire unit. Refer to Division 01 Section Closeout Procedures and Demonstration and Training.