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Model EEDU
and HEEDU
Indoor/Power-Vented
Duct Furnaces
INSTALLATION FORM RGM 421 (Version A)
APPLIES TO: Installation/Operation/Service
Table of Contents
Paragraph No. Page No.
Installation and Operation ........................ 1-26 .......................... 1-20
Check Installation and Start-Up .............. 27 ............................. 21
Service/Maintenance/Troubleshooting ..... 28-33........................ 22-24
Index by Page Number
Air Flow Requirements .............................
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HAZARD INTENSITY LEVELS 1. DANGER: Failure to comply will result in severe personal injury or death and/or property damage. 2. WARNING: Failure to comply could result in severe personal injury or death and/or property damage. 3. CAUTION: Failure to comply could result in minor personal injury and/or property damage. 2. Warranty 1. Installation Codes Refer to limited warranty information on the warranty card in the "Owner's Envelope". The duct furnaces covered in this manual are design-certified
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3. Dimensions Figure 1 C D 5" 16" K L (centerline of hangers) (127mm) (406mm) F Electric Supply M 6-3/4" H Limit (171mm) Keep 18" Airflow A clear for (457mm) service 29" (737mm) 8-1/8" (206mm) 3-1/2" Combustion Combustion View E (89mm) Air Opening 26" Air Opening port J B (660mm) (Duct width) 4" (102mm) (both G = Gas Minimum unit sides) Connection spacing Front View (not supply line) Side View Rear View Dimensions (inches) Size A B C D E F G H J K L M Nat Pro 75, 100 34-3/8 14-1/4 35-11/16 14-5/
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4. Uncrating and Preparation 5. Location, Clearances, and This furnace was test operated and inspected at the factory prior to Combustion Air crating and was in operating condition. If the furnace has incurred any damage in shipment, file a claim with the transporting agency. Unit must be installed so that the following clearances are provided for combustion air space, service and inspection, and for proper spacing CAUTION: Remove the panel from the bottom rear of the from combustible constructi
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2, depending on the combustion air source as noted in Items 1, 2, and 3 below the illustration. Figure 3A - Limit Control Location - When reversing Add total BTUH of all appliances in the confined space and divide by air flow, the limit control must be re-located. The figures below for square inch free area size of each (top and bottom) limit control MUST be on the discharge end of the opening. heat exchanger 1. Air from inside the building -- openings 1 square inch free area per 1000 BTUH. Nev
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Figure 4A - Suspending a Single Furnace 6. Instructions for Reversing Air 7/16" Diameter Flow (cont'd) Threaded Rod 15/32" Figure 3C - Model Nut for 7/16" Rod (12mm) HEEDU has only a Diameter top rear heat Hole exchanger baffle. 15/32" (12mm) Diameter Hole Hanger Split Ring Lockwasher Nut for 7/16" Rod Size "A" Centerline of hangers 75-100 14-5/8" 371mm A 125-140 17-3/8" 371mm 170 20-1/8" 371mm 200 22-7/8" 371mm 225 25-5/8" 371mm 250 28-3/8" 371mm 300 33-7/8" 860mm 3. All Models - Relocate the l
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8. Coupling Two, Three, Four or Five Furnaces using Optional Coupling Kits Refer to illustrations and follow the instructions below. Figure 6B - Installing Coupling Kit Coupling Kit, Option CR1 (P/N Tie Plate 57963), for Two Furnaces 4" Qty P/N Description 1 2 57964 Filler Plate 2 1 57965 Tie Plate 2 9557 Threaded Socket Assembly 3 2 5095 3/8-16 x 1-1/4" lg Hex 6 Unit Unit Head Bolts 2 1 2 5197 Split Ring Lock Washer 5 20 11813 #10 x 1/2" lg Sheetmetal Screws 7 7 Additional Kits: 3 Furnace
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9. Gas Piping and Pressures WARNING: This appliance is equipped for a maximum gas supply pressure of 1/2 pound, 8 ounces, or 14 inches water column. Supply pressure higher than 1/2 pound requires installation of an additional service regulator external to the unit. PRESSURE TESTING SUPPLY PIPING Test Pressures Above 1/2 PSI: Disconnect the heater and manual valve NOTE: To permit from the gas supply line which is to be tested. Cap or plug the supply burner removal, line. this nipple must Test Pr
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For Natural Gas: Manifold gas pressure is regulated by Instructions for Checking Manifold Pressure: the combination valve to 3.5" w.c. Inlet pressure to the valve 1) With the manual valve (on the combination valve) positioned to prevent flow to must be a minimum of 5" w.c. or as noted on the rating the main burners, connect a manometer to the 1/8" pipe outlet pressure tap in the plate and a maximum of 14" w.c. valve. NOTE: A manometer (fluid-filled gauge) is recommended rather than a For Propane
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4. Vent System Joints - Vent system joints depend on the installa- 10. Venting (cont'd) tion and the type of pipe being used. Specific Venting Requirements (read all before installing) (cont'd) If installed as a Category III heater (required if more than half of 1. Venter (Flue) Outlet (cont'd) the equivalent length of the vent system is horizontal) and single- Venter Outlet Attachment Requirements (cont'd): wall vent pipe is being used, use at least two non-corrosive screws A minimum of 12" o
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Instructions to connect the SINGLE WALL VENT system to a 3) Repeat Step 2) drilling and inserting two additional screws evenly ° DOUBLE WALL (Type B) VENT TERMINAL: spaced (120 apart). 1) Slide the single wall pipe inside the inner wall of the double-wall 4) To seal the annular opening (the gap between the single and double terminal pipe. wall pipe), run a large bead of silicone sealant in the opening. The 2) Drill a hole through both walls of the double wall pipe and the bead of sealant must be
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11. Duct Connections Figure 12A - Connecting Ductwork to the Furnace 1 Flanges on the heater turn out as shown. Figure 11 - Duct Connection Dimensions 2 Shape duct connection as shown -- "U" on top and bottom; (inches) "L" on sides. 3 Slide "U" form over heater flange making connection. Size G 4 Form "U" strips to seal ends. Drill and lock with sheetmetal 75, 100 12-1/2" 318 screws. 15-1/4" 387 125, 140 170 18" 457 200 20-3/4" 527 225 23-1/2" 597 26-1/4" 641 250 300 31-3/4" 806 350 37-1/4" 946 4
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12. Condensate Drain, Option CS1, for Furnaces Used with Refrigeration Systems Figure 13 - Condensate Drain, Option CS1 (P/N 31765) 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, condensation will form and therefore, adequate provision must be made to dispose of the condensate. A drain flange, Option CS1, may be insta
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14. Bypass Duct (cont'd) 15. Furnace Blower Connections Requirements: Proper arrangements of blower and duct furnace with respect to 4) Move to the left column to find out the required size of angle of approach of the duct connection and the arrangement of the discharge the bypass duct. opening of the blower are shown. Blowers should be bottom horizontal dis- Example: Bypass Duct charge when coupled to the duct furnace. When a top horizontal discharge blower Size is 5" is connected to the duct f
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16. Combustion Air Proving Figure - 15 - Field Wiring Connections Switch Connect Field Wiring in the The combustion air proving switch is a pressure sensitive switch that monitors air pressure to ensure that proper combustion air flow Electrical Box 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 flue gas collection box. On start-up when the heater is cold, the sensing pressure is at the most negative
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Typical 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 W.D. 110920 Field and Replacement Wiring Notes 1. Dotted wiring supplied by others. 2. Thermostat supplied as optional equipment. 3. Use #14 gauge wire for line wiring to unit. 4. Use #18 gauge wire for control wiring. 5. Line and blower motor branch circuit wire sizes should be of a size to prevent voltage
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Two-Stage with Intermittent Spark Pilot System with or without Lockout W.D. 110824 $" $ " # #
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19. Fan Control (Optional, Figure 17 - Installation of Optional Fan Control Kit, Option CQ1 (P/N 57960) 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 keeping the fan in operation in the event that the gas valve fails to close when the thermostat is
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20. Gas Valve Figure 18 - Ductstat/Sensing Bulb Locations for All furnaces are equipped with a 24-volt combination valve which Furnace with Option AG3 includes the automatic electric on-off valve controlled by the room thermostat, the pressure regulator, the safety pilot valve, and the The ductstat provided with Op- manual shutoff valve. The standard gas valve allows for single-stage tion AG3 is attached to the side The sensor is mounted on a control from a single-stage, 24-volt thermostat. of t
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els. Electronic modulation control systems for makeup air applications 22. Optional 2-Stage Operation (cont'd) o controlled by a duct sensor and temperature selector (55-90 F) are iden- tified as either Option AG8 or Option AG9. The temperature selector Dial has no temperature markings. Pin on adjustment o setting for Option AG8 is on the amplifier; Option AG9 has a remote screw pointing to "B" equals approximately 70 F. temperature selector. Both systems are available with an override ther- mo
