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Thomas & Betts HEEDU - page 1
RGM Form 421, Mfg No. 150492, Page 1 FOR YOUR SAFETY The use and storage of gasoline or other flammable vapors and liquids in open containers in the vicinity of this appliance is hazardous. W ARNING: Gas-fired appliances ar e not designed for use in hazardous atmospheres containing flammable vapors or combustible dust, in atmospheres containing chl ...
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Thomas & Betts HEEDU - page 2
Form 421, Page 2 1. Installation Codes The duct furnaces covered in this manual are design-certified by the American Gas Association and approved by the Canadian Gas Asso- ciation for use with either natural or propane gas. The type of gas for which the furnace is equipped and the correct firing rate are shown on the rating plate attached to the un ...
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Thomas & Betts HEEDU - page 3
RGM Form 421, Mfg No. 150492, Page 3 3. Dimensions Figure 1 Di m e ns i o ns (i nche s ) Si z e A B C D E F G H J K L M Nat P r o 75, 100 34- 3/ 8 14- 1/ 4 35- 11/ 16 14 -5/ 8 4-3 / 8 3-1 5/ 16 1/ 2 1/ 2 5/ 8 12- 1/ 2 7-1 / 4 7-7 / 16 4- 5/ 8 125, 140 34- 3/ 8 17 35-11 / 16 17- 3/ 8 4-3 / 8 3-1 5/ 16 1/ 2 1/ 2 5/ 8 15- 1/ 4 7-1 / 4 7-7/ 16 6 170 3 ...
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Thomas & Betts HEEDU - page 4
Form 421, Page 4 4. Uncrating and Preparation This furnace was test operated and inspected at the factory prior to crating and was in operating condition. If the furnace has incurred any damage in shipment, file a claim with the transporting agency . Check the rating plate for the gas specifications and electrical charac- teristics of the furnace t ...
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Thomas & Betts HEEDU - page 5
RGM Form 421, Mfg No. 150492, Page 5 6. Instructions for Reversing Air Flow by Changing Directional Air Baffles in the Heat Exchanger Duct furnaces are equipped with directional air baffles between the heat exchanger tubes. Facing the control compartment of the furnace, the standard direction of air flow is from the rear of the furnace (gas valve l ...
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Thomas & Betts HEEDU - page 6
Form 421, Page 6 6. Instructions for Reversing Air Flow (cont'd) 3. All Models - Relocate the limit control. a) At the dischar ge end on the same side of the heat exchanger , mea- sure down 4-1/2" and in 1-1 1/16". Using that point as the center, punch a 2-1/4" diameter hole in the side panel. NOTE: It may be necessary to move c ...
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Thomas & Betts HEEDU - page 7
RGM Form 421, Mfg No. 150492, Page 7 8. Coupling Two, Three, Four or Five Furnaces using Optional Coupling Kits Refer to illustrations and follow the instructions below . Figure 6C - Fr ont V iew of Coupled Furnaces Figure 6D - T op V iew of Coupled Furnaces (NOTE: Access panel may be in top or bottom of ductwork.) Instructions for Coupling Furnace ...
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Thomas & Betts HEEDU - page 8
Form 421, Page 8 9. Gas Piping and Pressures W ARNING: This appliance is equipped for a maximum gas supply pressur e of 1/2 pound, 8 ounces, or 14 inches water column. Supply pr essure higher than 1/2 pound r equires installation of an additional service regulator external to the unit. PRESSURE TESTING SUPPL Y PIPING T est Pr essures Above 1/2 PSI: ...
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Thomas & Betts HEEDU - page 9
RGM Form 421, Mfg No. 150492, Page 9 10. V enting W ARNING: Failure to pr ovide proper venting could r esult in death, serious injury , and /or property damage. Unit must be installed with a flue connection and proper vent to the outside of the building. Follow installation codes listed in Paragraph 1 and all venting instructions. Safe operation of ...
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Thomas & Betts HEEDU - page 10
Form 421, Page 10 10. V enting (cont'd) Specific V enting Requirements (read all befor e installing) (cont'd) 1. V enter (Flue) Outlet (cont'd) V enter Outlet Attachment Requirements (cont'd): o A minimum of 12" of straight pipe is required at the venter outlet (or transition fitting) before installing an elbow in the vent ...
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Thomas & Betts HEEDU - page 11
RGM Form 421, Mfg No. 150492, Page 11 Figure 9 - V ertical V ent T erminal Horizontal Vent Terminal Clearances The location of the termination of the hori- zontal vent system must be in accordance with National Fuel Gas Code Z223.1. See table for required minimum clearances. If the vent terminal is to be installed near ground level, position it at ...
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Thomas & Betts HEEDU - page 12
Form 421, Page 12 1 1. Duct Connections NOTE: If the furnace is equipped with a unit-mounted ductstat (Op- tion AG3), the sensing bulb must be removed from the mounting bracket (save the retainer clip) before the ductwork can be attached. See in- structions in Paragraph 22 for re-mounting the sensor . Requirements and Suggestions for Connecting and ...
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Thomas & Betts HEEDU - page 13
RGM Form 421, Mfg No. 150492, Page 13 12. Condensate Drain, Option CS1, for Furnaces Used with Refrigeration Systems These furnaces are certified for installation upstream or downstream from refrigerated units supplying air below the dew point of the ambi- ent air surrounding the furnace. When installed downstream from a refrigeration system, conde ...
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Thomas & Betts HEEDU - page 14
Form 421, Page 14 15. Furnace Blower Connections Requirements: Proper arrangements of blower and duct furnace with respect to angle of approach of the duct connection and the arrangement of the discharge opening of the blower are shown. Blowers should be bottom horizontal dis- charge when coupled to the duct furnace. When a top horizontal discharge ...
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Thomas & Betts HEEDU - page 15
RGM Form 421, Mfg No. 150492, Page 15 16. Combustion Air Proving Switch The combustion air proving switch is a pressure sensitive switch that monitors air pressure to ensure that proper combustion air flow is available. The switch is a single pole - normally open - device which closes when a decreasing pressure is sensed in the outlet duct of the f ...
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Thomas & Betts HEEDU - page 16
Form 421, Page 16 T ypical Wiring Diagrams -- Refer to the diagram supplied with the heater for specific controls or optional equipment. Single-Stage with Intermittent Spark Pilot System with or without Lockout Field and Replacement Wiring Notes 1. Dotted wiring supplied by others. 2. Thermostat supplied as optional equipment. 3. Use #14 gauge wire ...
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Thomas & Betts HEEDU - page 17
RGM Form 421, Mfg No. 150492, Page 17 T wo-Stage with Intermittent Spark Pilot System with or without Lockout W .D. 1 10824 G67BG-5 FLAME SENSING BK BL IGNITOR CHASSIS GRND. G770NGC-4 IGNITION LOCKOUT RECYCLE CONTROLLER 1 2 3 4 OR GRND PROBE W G BR GRND. STRIP BR 1 3 12 CR BR BR BK BK O O 40 VA. CONTROL BK BL 24V LINE VOLT BR R TRANSFORMER Y BK BK ...
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Thomas & Betts HEEDU - page 18
Form 421, Page 18 19. Fan Control (Optional, Field Installed) NOTE: Required with makeup air gas control options; see Paragraphs 22 and 23. 1. Fan control provides the following: a) Delay of fan op- eration preventing circulation of cold air , and b) Fan op- eration as long as the unit is hot. 2. The fan control provides additional safety by keepin ...
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Thomas & Betts HEEDU - page 19
RGM Form 421, Mfg No. 150492, Page 19 20. Gas V alve All furnaces are equipped with a 24-volt combination valve which includes the automatic electric on-off valve controlled by the room thermostat, the pressure regulator , the safety pilot valve, and the manual shutoff valve. The standard gas valve allows for single-stage control from a single-stag ...
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Thomas & Betts HEEDU - page 20
Form 421, Page 20 22. Optional 2-Stage Operation (cont'd) Optional Ductstat with Electronic Remote Setpoint Module (Op- tions AG15 and AG16) -- The field-installed sensing probe is field- wired to a remote temperature selector with a temperature operating range to 130 o F . The remote modules and a required transformer are shipped separately f ...
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Thomas & Betts HEEDU - page 21
RGM Form 421, Mfg No. 150492, Page 21 b) No voltage between black and brown leads on the main gas valve -- check for disconnected or shorted flame sen- sor lead or flame sensor probe. When the above conditions are normal and the main gas flow is still off, the ignition controller is probably defective. 25. Burners and Carryover System These duct fu ...
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Thomas & Betts HEEDU - page 22
Form 421, Page 22 SERVICE AND MAINTENANCE W ARNING: If you turn off the power supply , turn off the gas. See Hazard Levels, page 2. Maintenance Requirements -- Like all quality equipment, this unit will operate with a minimum of maintenance. However , to ensure long life and satisfactory performance, the following service schedule is rec- ommended. ...
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Thomas & Betts HEEDU - page 23
RGM Form 421, Mfg No. 150492, Page 23 All Sizes 75, 100 and 125 (do not have heat exchanger "V" baffles) and Sizes 140-400 manufactur ed prior to 1 1/95 (do not have heat exchanger "V" baf fles) -- Remove the burner rack assembly . Use a furnace brush (or a piece of heavy wire to which a piece of steel wool is attached). Brush u ...
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Thomas & Betts HEEDU - page 24
Form 421, Page 24 32. T roubleshooting (cont'd) FIRST : Contact the installer . Name _______________________________________________________________________________________ Address ________________________________________________________________________________________ ___________________________________________________________________________ ...
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