P.O. Box 410
Schofield, WI  54476

Phone:  715.359.6171
www.greenheck.com

Product Specification Guide
Model IDHB and IDHC Series Duct Heaters
Facility Service Subgroup: 23 82 33 – Electric Duct Heaters

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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 guide specification is written according to the Construction Specifications Institute (CSI) Format.

The 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 "Specifier Notes" when editing this section.
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PART 1	  GENERAL

1.1	WORK INCLUDED

A.	This section contains Duct Heaters , IDHB and IDHC 

1.2	RELATED WORK
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Specifier Notes: Edit the following list as required for the project.  List other sections with work directly related to the dampers. *****************************************************************************************************
A.	Section 238233 – Duct Heaters

1.3	REFERENCES
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Specifier Notes: List standards referenced in this section, complete with designations and titles.  This article does not require compliance with standards, but is merely a listing of those used. *****************************************************************************************************

A.	The latest published edition of a reference shall be applicable to this Project unless identified by a specific edition date.
B.	All reference amendments adopted prior to the effective date of this Contract shall be applicable to this Project.

1.4	   SUBMITTALS

A.	Product Data: Submit manufacturer’s product data for duct heaters showing an electrical connection diagram, dimensions, capacities, ratings, performance characteristics, control type, and accessories

B.	Record Documents: Manufacturers wiring diagrams detailing electrical connections to duct heater for power, signal, and control systems wiring, differentiating clearly between manufacturer-installed wiring and field-installed wiring.

1.5	QUALITY ASSURANCE

A.	Manufacturer’s Qualifications: Firms regularly engaged in manufacture of electric duct heaters, of types and sizes required, whose products have been in satisfactory use in similar service for not less than three (3) years.

1.6	CODES AND STANDARDS
A.	All materials, installation and workmanship shall comply with the applicable requirements and standards addressed within the following references:
1.	National Fire Protection Association (NFPA) 70, National Electrical Code
2.	UL 1996
3.	Provide only UL listed electrical components.

1.7	DELIVERY, STORAGE, AND HANDLING
A.	Delivery: Deliver, store, protect, and handle products to the project site under provisions of Division 01 and 20.

B.	Storage: Store materials in a clean  dry area indoor, protected from damage.

C.	Handling: Handle carefully to avoid damage to components, enclosures, and finish.

PART 2   PRODUCTS

2.1	DESCRIPTION
A.	All horizontally installed electric duct heaters shall be designed and UL listed to operate with air flow traveling in either direction.

B.	Element housing: Element housing shall be constructed of heavy gauge G60, minimum, galvanized steel and configured for [Slip-in] or [Flanged] mounting.

C.	Testing Agency Listing and Labeling: Assembly shall be Listed to UL standard 1996 and approved for installation with zero clearance to combustibles. Heater shall bear UL and CSA labels.

D.	Heating elements: All heating elements shall be made of [N60] [80/20] nickel/chromium resistance wire with ends terminated by means of staking and Heliarc welding to machine screws.  Heating element support structure shall consist of galvanized steel wire formed around ceramic insulators that fully encircle and support the heating element.  

E.	Control Panel: Unit mounted control panel and cover shall be constructed of heavy gauge minimum G60 galvanized steel with multiple knockouts for field wiring.  Control cabinet cover shall be held in place with hinges and tool-release latches or door-interlocking type disconnect switch handle when provided.  Two latches shall be employed when cover is 48 inches wide or greater. Control panel shall provide means of safety disconnect and overcurrent protection. Include the following controls:

•	Door interlocking disconnect switch
•	[Fan interlock] circuit or an [(adjustable), (non-adjustable) airflow proving swtich]
•	[staged (1, 2, 3 or 4 stages)] or [SCR] control
•	[transformer]. [(fused), (unfused)], [24VAC, 120VAC]

F.	Over-temperature protection: Duct heater shall be supplied with primary automatically resetting and secondary manually reset thermal cut-out devices. These devices must function independently to prohibit the heater’s operation if either one is activated.  A disconnecting magnetic contactor circuit is required. All safety components must be serviceable through the control cabinet access panel without the need to remove the heater from the duct.

G.	Over-current protection: Duct heaters rated at more than 48 amps shall be supplied with factory-installed fusing.  Heating elements shall be subdivided and fused accordingly.

H.	All wiring component sizing, component spacing and protective devices within the control cabinet shall be factory installed and comply with NEC and UL standards.  All heaters shall function properly with a 50 or 60 Hz power supply.  

I.	Power and control conductors shall be terminated in factory installed and labeled terminal blocks.

J.	A wiring diagram depicting the layout and connection points of all electrical components shall be affixed to the inside of the control cabinet cover.   

K.	A rating label stating model number, serial number, volts, amps, phase, frequency, control volts, volt-amps and minimum airflow requirements shall be affixed to the exterior of the control cabinet cover.

PART 3	  EXECUTION

3.1	INSTALLATION
A.	Installation shall meet or exceed all applicable federal, state and local requirements, referenced standards and conform to codes and ordinances of authorities having jurisdiction.

B.	All installation shall be in accordance with manufacturer’s published recommendations.

C.	Inspect areas and conditions under which terminal units are to be installed.  Do not proceed with Work until unsatisfactory conditions have been corrected in manner acceptable to installer.

D.	Do not operate electric heaters for any purpose until ductwork is clean of any possible debris.

E.	Maintain minimum working clearances around the heater electrical panel in accordance with NEC Article 110.

F.	Install duct heaters in metal ducts and casings constructed according to SMACNA “HVAC Duct Construction Standards.” 

G.	If applicable, anchor duct heaters in position using suitable supports.

H.	Connect duct heaters and components to wiring systems and to ground as indicated by manufacturer wiring diagram and NEC. Tighten connectors and terminals to torques specified in UL 486A.

I.	After construction is completed, including painting, clean unit’s exposed surfaces and vacuum clean electric duct heaters and inside of cabinets.

END OF SECTION