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OEM
INSTALLATION INSTRUCTIONS
HE SERIES
DUCT FURNACE
HE Series Duct Furnaces are a Recognized Furnace Component
by Intertek Testing Services (ITS / ETL)
For Indoor or Outdoor Installation
For Installation Downstream of Refrigeration Systems
This Product is intended for installation by Original Equipment Manufacturers
of Listed Heating Equipment in Duct or Cabinet mounted Applications on
Positive Pressure side of the Circulating Air Blower
The duct furnace modules covered by these instructions become a component of a
"Listed" product, subject to the guidelines of application provided in these instructions
and as designated by the Certifying Agency in the Manufacturer's Listing Procedure
WARNING !
Improper installation, adjustment or alteration
can cause injury or death. Read installation,
operating and maintenance instructions
thoroughly before installing or adjusting furnace.
Manufactured by
Heatco Inc
50 Heatco Court
Cartersville, Ga. 30120
HE-OEM-MAN-E-2016-2
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Summary of Contents for heatco HE Series
- Page 1 INSTALLATION INSTRUCTIONS HE SERIES DUCT FURNACE HE Series Duct Furnaces are a Recognized Furnace Component by Intertek Testing Services (ITS / ETL) For Indoor or Outdoor Installation For Installation Downstream of Refrigeration Systems This Product is intended for installation by Original Equipment Manufacturers...
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Page 2: Table Of Contents
Duct Furnace Installation Condensate Drains Cabinet / Air Tunnel Vestibule Enclosure Combustion Air Gas Supply and Piping 7, 8 Electrical Requirements Venting Outdoor Indoor 9-12 Airflow / Turndown Burner Operation, Wiring Diagrams Instructions & Labels Annual Inspection & Maintenance HE Series Ratings... -
Page 3: Rating Information (Rating Plate)
Duct Furnace Ratings A Rating Plate is attached to the front shroud of the duct furnace to identify the model and serial number of this product. This plate must be left attached when the furnace is installed in the product for identification purposes. The Rating Plate contains information including gas type, maximum and minimum input rating for this furnace assembly and application, manifold pressure to provide rated Btuh input, maximum and minimum inlet supply gas pressure, maximum and minimum airflow requirements, output capacity and electrical ratings for this specific module. -
Page 4: Duct Furnace Installation
Duct Furnace Installation Figure 1 -Typical Installation Locate circulating blower at least 24 inches from closest heater surface. Locate downstream filters (if used) at least 36 inches from closest heater surface. An automatic reset High Limit Switch is provided in accordance with the listing standard to shut-off of the gas supply to the main burners if the outlet air exceeds the allowable maximum. -
Page 5: Cabinet / Air Tunnel
Cabinet / Air Tunnel Size Sheeting must be added to HE modules to direct airflow over the heat exchanger. See diagram below for proper sheeting guidelines. Using the top of the insulated front shroud as a guide, sheet horizontally back to join the vertical sheeting For optimum performance sheet vertically from the end of the base rail... -
Page 6: Combustion Air
Figure 2 - Vestibule Combustion Air Air required for combustion is drawn in through the inlet of the burner fan assembly. The vestibule in which burner is installed must have an ample supply of combustion air. Opening(s) in a panel or door (except separated combustion systems) must be provided in the enclosure and should be sized at 1 square inch of open area per 4,000 Btuh of input. -
Page 7: Gas Supply And Piping
Gas Supply and Piping Installation of gas piping must conform with ANSI Z223.1 (NFPA 54) National Fuel Gas Code. In Canada, installation must be in accordance with CAN/CGA –B149.1 for Natural gas and B149.2 for propane units. Use a pipe sealant resistant to LP gases on gas supply connections to heater. Properly support gas valve with back-up wrench, during installation to prevent loosening valves or damage to burner assembly or manifold. -
Page 8: Electrical Requirements
Figure 6- Typical Gas Piping – Midco V Series Burners Prior to shipment check both the supply lines and factory piping for leaks. Apply a soap and water solution to all joints and watch for bubbles indicating a leak. NEVER test for gas leaks with an open flame. The duct furnace requires a minimum inlet gas pressure of 7.0 “w.c. -
Page 9: Venting
Venting Installation of venting system in U.S. must conform to local building codes and / or the National Fuel Gas Code (ANSI Z223.1) or in Canada the Canadian Installation Code (CAN/CGA-B149) and the manufacturer’s installation instructions. If venting requirements exceed these guidelines, a custom vent design may be required. Proper venting of the heating section is important to safe and efficient operation of the duct furnace. - Page 10 Figure 8 - Standard Horizontal and Vertical Indoor Venting Arrangements Horizontal Venting Vertical Venting WARNING ! Indoor furnaces are equipped with a blocked vent safety switch to shut- off gas supply to the main burner in the event that a blockage occurs in the venting system downstream of the heater.
- Page 11 Table 1 – Vent Connector Size Max. Max. Flue Flue Exhaust Exhaust Model Maximum Model Maximum Vent Vent Size Input (Btuh) Size Input (Btuh) Diameter Diameter Length Length (inch) (inch) (ft.) (ft.) HE0250 325,000 HE1500 1,875,000 HE0320 400,000 HE1750 2,250,000 HE0400 550,000 HE2000...
- Page 12 Alternate Vent Terminations 6 ft. (1.8m) Min. 5 ft. (1.52m) Min. to Adjacent Wall 90o Elbow 30 ft. (3.81m) Max. 12" (0.3m) Minimum or Buidliung from adjacent wall Vent Pipe (Pitch up ¼”/Ft.) Vent Pipe Listed Vent Cap Burner Gas Burner 18"...
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Page 13: Airflow / Turndown
Airflow Considerations and Burner Turndown The HE duct furnace is a Category III appliance for non-condensing operation with a positive vent pressure. Operating under continuous condensing conditions must be avoided. The likelihood of condensing operation increases with: a.) Colder return air across the heat exchanger as on units supplying a large % of return air as outside air b.) Lower heat flow through heat exchanger, as with modulating burners operating at reduced input c.) Higher airflow across the heat exchanger as with low temperature rise applications or constant volume airflow while modulating burner input. -
Page 14: Instructions & Labels
Label Requirements The following labels are provided with the OEM package and must be affixed to the exterior of the appliance. WARNING! Improper installation, adjustment, alteration, service or maintenance can cause injury or death. Read the installation, operating and maintenance instructions thoroughly before installing or servicing this equipment. -
Page 15: He Series Ratings
Electrical Wiring Check wiring for loose connections or deterioration. Tighten connections and replace any wiring that is deteriorated. Wiring materials must be replaced with wire suitable for at least 105 HE Series Ratings Model Input Air Flow @ Min. - Page 16 (Page Left Blank) Heatco Inc. Cartersville, GA. 30120...
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