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GAS FURNACE
HIGHBOY AND COUNTERFLOW
USERS INFORMATION MANUAL
MODELS
FOR USE WITH NATURAL GAS OR LP GAS (PROPANE)
CHB1-50 CDB1-50 MHA1-50 MDA1-50
CHX1-75 CHB1-75 CDX 1-75 CDB1-75 MHA1-75 MDA1-75
CHX1-100 CHB1-100 CDX1-100 CDB1-100 MHA1-100 MDA1-100
CHX1-125 CHB1-125 CDX1-125 CDB1-125 MHA1-125 MDA1-125
: 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
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INDEX SECTION BEGINNING PAGE I. SAFETY INFORMATION 1 II. GENERAL INSTRUCTIONS 5 III. FURNACE OPERATION 10 A. WARNINGS BEFORE OPERATING 10 B. OPERATING INSTRUCTIONS 10 C. SHUTDOWN PROCEDURE 11 IV. HOMEOWNER/USER MAINTENANCE INSTRUCTIONS 11 (ROUTINE MAINTENANCE) A. ANNUAL INSPECTION 11 B. FILTER MAINTENANCE PROCEDURE 12 C. VISUAL INSPECTION PROCEDURE 14
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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 Condensing Gas Furnaces. Please read and comply with the contents of these labels. 1
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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. 2
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All installations and services must be performed by qualified service personnel. 3
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All installations and services must be performed by qualified service personnel. This page contains various warnings and cautions found throughout this manual. Please read and comply with the statements below. : 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. : Property damage, personal injury, or loss of life could result from repair or service of this furnace by anyone oth
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All installations and services must be performed by qualified service personnel. II. GENERAL INSTRUCTIONS 1. : Property damage, personal injury, or loss of life could result from repair or service of this furnace by anyone other than a qualified heating contractor. Only the routine maintenance described in this manual may be performed by the user. 2. The following diagrams show typical furnace installations and the typical position of the components referenced in these instructions.
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All installations and services must be performed by qualified service personnel. Figure 2 6
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All installations and services must be performed by qualified service personnel. Figure 3 7
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All installations and services must be performed by qualified service personnel. 3. : To avoid injury from moving parts, shut off the power to the furnace before removing blower compartment door. 4. : Keep furnace free and clear of combustible materials, gasoline, and other flammable liquids and vapors. 5. The furnace needs air for combustion and ventilation for safe and proper operation. IMPORTANT: Do not block or obstruct air openings on the furnace, air openings communicating
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All installations and services must be performed by qualified service personnel. 8. The furnace should be inspected annually by a qualified heating contractor. 9. : Do not use this furnace if any part has been under water. Immediately call a qualified heating contractor to inspect the furnace and to replace any part of the control system and any gas control which has been under water. 10. Should overheating occur or the gas supply fail to shut off, shut off the manual gas valve to the
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All installations and services must be performed by qualified service personnel. III. FURNACE OPERATION A. WARNINGS BEFORE OPERATING FOR YOUR SAFETY, READ BEFORE OPERATING : A fire or explosion may result causing property damage, personal injury or loss of life if you do not follow these instructions exactly. A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand. B. BEFOR
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All installations and services must be performed by qualified service personnel. 5. Turn gas control knob clockwise to “OFF” position. (For gas valves with a switch, move the switch to the “OFF” position). 6. Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow Step B in the previous safety information. Go to the next step if you don’t smell gas. 7. Turn gas control knob counterclockwise to “ON” position. (For gas valves with a switch, move the switch to the “
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All installations and services must be performed by qualified service personnel. NOTICE: This furnace has been shipped from the factory with a permanently lubricated circulating air blower motor. Any maintenance to this blower motor is to be performed only by a qualified heating contractor. B. FILTER MAINTENANCE PROCEDURE 1. The return air filter provided with this unit is a re-useable type filter. This filter should be inspected monthly. When dirty, the filter must be cleaned or r
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All installations and services must be performed by qualified service personnel. Figure 4. FILTER REPLACEMENT See Table 1 for minimum heating filter areas required for the different types of filters available should the filter used require replacement. If the unit is equipped with cooling, contact your installer or a qualified service person to determine the minimum filter area required for the different filter types and your cooling system. 13
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All installations and services must be performed by qualified service personnel. MINIMUM FILTER AREA REQUIRED (LENGTH X WIDTH, SQ. IN.) TABLE 1 FILTER TYPE MAXIMUM RATE AIR VELOCITY FURNACE MODEL CHX1, CDX1-75 CHX1, CDX1-100 CHX1, CDX1-125 CDB1, CHB1-50 CDB1, CHB1-75 CDB1, CHB1-100 CDB1, CDB1-125 MDA1, MHA1-50 MDA1, MHA1-75 MDA1, MHA1-100 MDA1, MHA1-125 2 2 2 2 *THERMO PRODUCTS 600 FT./MIN. 172 IN. 254 IN. 328 IN. 402 IN. SUPPLIED PERMANENT FILTER 2 2 2 2 STANDARD 500 FT./MI
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All installations and services must be performed by qualified service personnel. 3. Flue Pipe Connection & Chimney for MDA1/MHA1: Visually check flue pipe and chimney for tightness, blockage and corrosion. If fittings are loose or if blockage or corrosion is suspected to be a problem, contact a qualified heating contractor. Make sure horizontal runs of the flue have an upward slope away from furnace of 1/4" per foot minimum and are physically sound without holes, cracks or signs of corrosi
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All installations and services must be performed by qualified service personnel. 9. Make sure the burner flames are in good adjustment (See Figure 6). Burner flames should not impinge or fire against the side of the tube opening. NOTICE: It is not unusual to have orangish flames visible in the tube for LP gas. Figure 6. : Call a qualified heating contractor to report suspected deficiencies (do not attempt to make repairs yourself!) 16
