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TWO STAGE CONDENSING GAS FURNACE
INSTALLATION AND OPERATION MANUAL
MODELS:
FOR USE WITH NATURAL GAS OR LP GAS (PROPANE)
CHX3-75N CDX3-75N
CHX3-100N CDX3-100N
CHX3-125N CDX3-125N
: IF YOU DO NOT FOLLOW THE SAFETY PRECAUTIONS BELOW AND IN THIS
MANUAL, A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL
INJURY, OR LOSS OF LIFE.
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE
VICINITY OF THIS OR ANY OTHER APPLIANCE.
WHAT TO DO
Summary of the content on the page No. 2
All installations and services must be performed by qualified service personnel. I. SAFETY INFORMATION This and the following page contain reproductions of the various warning and instruction labels placed on the Thermo Pride Two Stage Condensing Gas Furnaces. Please read and comply with the contents of these labels. i
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All installations and services must be performed by qualified service personnel. This and the previous page contain reproductions of the various warning and instruction labels placed on the Thermo Pride Two Stage Condensing Gas Furnaces. Please read and comply with the contents of these labels. The following safety information should be read, understood, and followed by the installer. WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing prope
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All installations and services must be performed by qualified service personnel. 1. Use only with type of gas approved for this furnace. Refer to furnace rating plate. 2. Connect this furnace to an approved vent system only. Combustion products must be carried outdoors. Refer to Section III, D thru H, of this manual. The following pages contain various warnings and cautions found throughout the Thermo Pride Highboy and Dual Poise Two Stage Condensing Gas Furnace Manual. Please read
Summary of the content on the page No. 5
All installations and services must be performed by qualified service personnel. : The CHX3/CDX3 furnace models are sealed combustion design, which does not require an air shutter adjustment (air shutters are not used) for proper flame characteristics. Burner box access cover must always be secured with all screws in place and tightened before operating furnace. : Personal injury or property damage could result from repair or service of this furnace by anyone other than a qualified heati
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All installations and services must be performed by qualified service personnel. INDEX SECTION BEGINNING PAGE I. SAFETY INFORMATION i II. FURNACE SPECIFICATIONS 1 III. GENERAL INSTALLATION 6 A. CODES AND CLEARANCES 6 B. FURNACE LOCATION 7 B1.CDX3 HORIZONTAL APPLICATION 7 C. REPLACING EXISTING FURNACE FROM A COMMON VENT 9 D. GENERAL REQUIREMENTS FOR VENTING CHX3/CDX3 9 E. SIDEWALL VENTING 11 E1. SINGLE PIPE (SIDEWALL)
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All installations and services must be performed by qualified service personnel. II. FURNACE SPECIFICATIONS CHX3 SERIES MODEL NO. CHX3-75 CHX3-100 CHX3-125 BTU/HR INPUT (High fire/ Low fire) 75,000 / 52,000 100,000 / 70,000 125,000 / 87,500 BTU/HR OUTPUT (High fire/ Low fire) 71,000 / 49,000 95,000 / 66,000 115,000 / 82,000 HEIGHT OF CASING 44-1/4” 44-1/4” 44-1/4” WIDTH OF CASING 17” 21” 24” 27-1/2” 27-1/2” 27-1/2” DEPTH OF CASING WARM AIR OUTLET 15 x 18 19 x 18 22 x 18 RET
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All installations and services must be performed by qualified service personnel. CDX3 SERIES MODEL NO. CDX3-75 CDX3-100 CDX3-125 75,000 / 56,250 100,000 / 75,000 125,000 / 93,750 BTU/HR INPUT (High fire / Low fire) BTU/HR OUTPUT (High fire / Low fire) 71,000 / 52,000 94,000 / 69,000 116,000 / 87,000 46-1/4” 46-1/4” 46-1/4” HEIGHT OF CASING WIDTH OF CASING 17” 21” 24” DEPTH OF CASING 27-1/2” 27-1/2” 27-1/2” 15 x 18 19 x 18 22 x 18 WARM AIR OUTLET RETURN AIR INLET 15 x 22 19 x 2
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All installations and services must be performed by qualified service personnel. INSTALLATION PARTS PACKAGES – CHX3-75 PARTS PACKAGE DESCRIPTION PART # QUANTITY #S00S4413 2-3/8” ID radiator hose 410017 1 Thermostat lead bushing 350750 1 PVC trap assembly 320816 1 #8 x ¾ coated TEK screws for 300283 4 mounting trap & inlet/outlet collars 11/16” OD x 1/2” ID vinyl tubing 410060 24” 2 x 4 electrical J-box 350024 1 2 x 4 electrical J-box cover 350020 1 #8 x ½ TEK screws f
Summary of the content on the page No. 10
All installations and services must be performed by qualified service personnel. PVC tee assembly, 2 x 3” dia. 320817 1 CPVC XPVC adapter 320833 1 Gas Conversion Kit AOPS7683/7419 1 INSTALLATION PARTS PACKAGES – CDX3-75 PARTS PACKAGE DESCRIPTION PART # QUANTITY #S00S4416 2-3/8” ID radiator hose 410017 1 Thermostat lead bushing 350750 1 PVC trap assembly 320816 1 #8 x ¾ coated TEK screws for 300283 6 mounting trap & inlet/outlet collars 11/16” OD x ½” ID vinyl tubing
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All installations and services must be performed by qualified service personnel. Grounding instructions MG-966 1 Wire nut 300132 2 3” stainless steel hose clamp 300276 2 J-box wire bushing 350016 1 Drain hose grommet 350446 1 Spring clamp, 11/16” 300299 3 Installation notice MG-987 1 PVC tee assembly, 2 x 3” dia. 320817 1 PVC tee assembly, 2” dia. 320819 1 Pipe 2” dia. PVC 15” 14401 1 Bracket 14406 1 Reducer 2” x 3” PVC 320067 1 CPVC XPVC adapter 320833 1 Gas Conve
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All installations and services must be performed by qualified service personnel. III. GENERAL INSTALLATION These Category Type IV furnaces are shipped completely assembled and wired (internally). See the Dealer Receiving and Freight Claim Procedure Section of the price guide for parts shortage or damage. The furnace and duct system must be adjusted to obtain a temperature rise of 55°F to 85°F through the furnace after installation. (See rating label located on side panel inside the furnac
Summary of the content on the page No. 13
All installations and services must be performed by qualified service personnel. These furnaces may be installed in an alcove or in a closet if the minimum clearances to combustible construction (listed previously) are met. The CDX3 series furnaces may be installed in an attic or crawl space. Refer to section III, B1 of this installation manual. The minimum clearances are listed for fire protection. Clearance for servicing the front of the furnaces and to all points on the furnace requiri
Summary of the content on the page No. 14
All installations and services must be performed by qualified service personnel. For a right side horizontal application of the CDX3 series units, the auxiliary limit switch located on the right side of the house air blower must be moved to the bracket on the opposite (left) side of the blower (See Figure 1). NOTE: When the CDX3 is installed as horizontal unit, it is imperative that the auxiliary limit switch and bracket be located on the upper side of the house air blower; the burner rol
Summary of the content on the page No. 15
All installations and services must be performed by qualified service personnel. The horizontal furnace installation should be on a service platform large enough to allow for proper clearances on all sides and service access to the front of the furnace (See Table 1). If the furnace is suspended, it must be supported at both ends and in the middle with clearance allowed for removal of both access doors. Gas supply line contact is only permissible between lines formed by the intersection of t
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All installations and services must be performed by qualified service personnel. Horizontal runs of air intake pipe shall slope downward at least ¼ inch per foot from the outlet of the last elbow or last horizontal run, before exiting the wall, to the intake termination beyond the outside wall. This slope will permit proper drainage of any precipitation that enters the intake pipe. 6. The exhaust vent pipe shall be supported at every joint (no more than 4-feet between supports) to prevent p
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All installations and services must be performed by qualified service personnel. NOTICE: DO NOT use silicone caulk to seal the pipe sleeve or coupling to the metal air intake collar on the burner box. Securing the sleeve or coupling to the collar using a screw is sufficient. 10. Vent connections shall be checked for leakage with the furnace induced draft blower running and with the vent termination blocked. Use a mild soap and water solution to check for leaks. 11. Vent pipe passing th
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All installations and services must be performed by qualified service personnel. b. The bottom edge of the vent termination elbow must be installed at least 12-inches above the outlet of intake termination elbow. c. The horizontal distance between the inlet and exhaust terminations should be minimized, when possible, and should never exceed 24-inches. d. The vent and intake systems should utilize the same numbers of elbows and approximately the same length of straight pipe to reach t
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All installations and services must be performed by qualified service personnel. Figure 4: NFGC Minimum Clearances Between the Vent Terminal and Various Building Features Vent Terminal Location Guidelines 13
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All installations and services must be performed by qualified service personnel. : Bushes, shrubs, or any vegetation that may restrict the flow of flue products must be kept away from vent and air intake terminations. Terminations must also be kept clear of any leaves, weeds, combustible materials, snow, and ice build-up. Avoid locating the vent terminal over areas where dripping of condensate, or small pools of acidic condensate, could create a problem. In addition to following any loca
