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GAS FIRED HIGH EFFICIENCY FURNACE
DOWN FLOW & DIRECT VENT (SEALED COMBUSTION)
MODEL: CMA1-50N & CMA2-75N
INSTALLATION AND SERVICE MANUAL
For installation in:
1. Manufactured Homes
2. Modular Homes/Buildings
3. Site Constructed—Residential (Single Story Dwellings)
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this
or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do no
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TABLE OF CONTENTS SECTION BEGINNING PAGE I. SAFETY INFORMATION 1 II. FURNACE SPECIFICATIONS 6 III. GENERAL INSTRUCTIONS AND CLEARANCES 7 IV. GENERAL INSTALLATION 9 A. FURNACE LOCATION 9 B. BASE INSTALLATION 12 C. ALCOVE INSTALLATION 13 D. CLOSET INSTALLATION 14 E. FUEL PIPING 15 F. GENERAL VENTING REQUIREMENTS 16 G. CONNECTING THE EXHAUST VENT, AND COMBUSTION 18 A
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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 safety and instruction labels placed on the Thermo Pride 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. The following safety information should be read, understood, and followed by the installer. 1. Use only with type of gas approved for this furnace. Refer to furnace rating plate. 2. Do not install this furnace where it could be exposed to drafts or other wind or moisture conditions. Refer to Section IV of this manual. 3. Provide adequate ventilation air to the furnace space. Refer to Section IV, C and
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All installations and services must be performed by qualified service personnel. : The vent and air intake elbows must be kept away from bushes, shrubs or any vegetation that may restrict the flow of flue products. It must also be kept clear of any leaves, weeds or other combustible materials. Keep the vent hood clear of snow. Avoid locating the terminals in areas where standing water or condensate drippage may be a problem. : This CMA furnace has been designed to be installed as a direc
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All installations and services must be performed by qualified service personnel. : Copper and brass tubing and fittings (except tin lined) shall not be used if the gas contains more than a trace (0.3 grains per 100 cubic ft.) of hydrogen sulfide gas. Check with your gas supplier. : TURN OFF THE ELECTRICAL POWER to the furnace before attempting to change blower speed wiring. : Turn off power to furnace before it is placed into service. The gas piping system must have been leak tested b
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All installations and services must be performed by qualified service personnel. II. FURNACE SPECIFICATIONS - CMA SERIES MODEL CMA1-50 CMA2-75 INPUT IN BTUH 50,000 75,000 OUTPUT IN BTUH 48,000 72,000 MAIN ORIFICE-NAT. #42 MAIN ORIFICE-LP 1.5 mm GAS SUPPLY PRESSURE L.P. MINIMUM 11” IN.W.C. NAT. MINIMUM 4.5”IN.W.C. L.P. MAXIMUM 14” IN.W.C. NAT. MAXIMUM 14” IN.W.C. GAS MANIFOLD PRESSURE L.P. 10.0” + .03 IN.W.C. NA
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All installations and services must be performed by qualified service personnel. INSTALLATION PARTS PACKAGE CMA*-50 CMA*-75 PARTS PKG# S00S4179 S00S4114 DESCRIPTION PART # QTY PART # QTY J-box cover 350020 1 350020 1 wire nut 300132 2 300132 2 3" stainless steel hose clamp 300276 4 300276 4 2-3/8" radiator hose 410017 2 410017 2 CPVC adapter 320833 1 320833 1 LP conversion kit AOPS7677 1 AOPS7678 1 III. GENERAL INSTRUCTIONS AND CLEARANCES – READ B
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All installations and services must be performed by qualified service personnel. accordance with the latest edition of the UL Standard for Single and Multiple Station Carbon Monoxide Alarms, UL 2034, or the CSA International Standard, Residential Carbon Monoxide Alarming Devises, CSA 6.19. 5. The installer shall be familiar with and comply with all codes and regulations applicable to the installation of these heating appliances and related equipment. In lieu of local codes, the install
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All installations and services must be performed by qualified service personnel. MODELS CMA CLOSET ALCOVE FRONT 6” 18” BACK 0” 0” SIDES 0” 0” VENT CONNECTOR(PVC) 0” 0” TOP 0” 0” PLENUM SIDES 1” 1” TOP AND SIDES OF DUCT 1” 1” BOTTOM OF DUCT 1” 1” Table 1 This heating appliance must be installed with clearances not less than the minimums shown above as well as ample clearance for easy access to the air filter, blower assembly, burner assembly, controls, and vent c
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All installations and services must be performed by qualified service personnel. Combustible Floor Base Model: 70-BASE Figure 1A. Coil Cabinet Model: CE113S Note: This cabinet cannot be utilized as a cottage base. Figure 1B. 10
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All installations and services must be performed by qualified service personnel. Cottage Base Model: 01COT-BASE Figure 1C. NOTE: Serves as a plenum for single story applications with exposed supply air systems. 11
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All installations and services must be performed by qualified service personnel. B. BASE INSTALLATION 1. Combustible Floor Base Model: 70 BASE Use the base bottom panel as a template to mark floor opening locations (see Figure 2). Cut a square opening in the floor for the supply air connector duct. Cut the opening 1-inch larger than the square template opening. (duct requires 1-inch clearance to combustible floor). Figure 2.
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All installations and services must be performed by qualified service personnel. connector duct. Remove the bottom panel. Cut an opening in the distribution duct slightly larger than the connector duct. (refer to Figure 2 for location of this cut.) Cut the connector duct to length. Install the connector duct. Bend over each tab. Insure an airtight seal by using high temperature sealant or tape on the joint. Reinstall the bottom panel over the connector duct. Put the base top assembly in pl
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All installations and services must be performed by qualified service personnel. D. CLOSET INSTALLATION 1. The return air opening into the closet is to have a minimum free area of 250 sq. in. (see Figure 5). 2. The return air opening may be located in the top, center or (ideally) bottom of the closet door or side wall. Figure 5. : Do not obstruct any return air openings, including the return grille on the furnace. To do so may cause
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All installations and services must be performed by qualified service personnel. E. FUEL PIPING Sizing and installation of fuel lines must be in accordance with Federal, State & Local regulations. Including the National Fuel Gas Code NFPA 54/ANSI-Z233.1 (Latest Edition). NOTE: These furnaces are designed to be gas piped through the left side or the bottom. For service purposes, it is recommended that the gas union be located inside the furnace when possible. : Because of the p
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All installations and services must be performed by qualified service personnel. : The furnace and its gas valve must be disconnected from the gas supply during pressure testing of the gas supply system at pressures in excess of 1/2 PSIG or 14 inches w.c F. GENERAL VENTING REQUIREMENTS The CMA furnace venting system must be installed by a qualified service person in accordance with local codes, the National Fuel Gas Code NFPA 54/ANSI- Z223.1 (Latest Edition) and these instructio
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All installations and services must be performed by qualified service personnel. MAXIMUM VENT LENGTH VENT SIZE 2 IN. PVC FURNACE VENT EXHAUST COMBUSTION AIR INTAKE MODEL LENGTH VENT ELBOWS (NO.) (FT.) ELBOWS (NO.) CMA 30 8* 7** *Note the drain elbow supplied with CMA furnaces count as 1 elbow. **Note the two 45° elbows supplied w/CMA furnace count as 1 elbow. Table 2 6. A hack saw may be used to cut the PVC pipe. It must be cut smoothly at right angles with all burrs remo
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All installations and services must be performed by qualified service personnel. G. CONNECTING THE EXHAUST VENT AND COMBUSTION AIR INTAKE Figure 6. shows the typical exhaust vent and combustion air intake connection for CMA furnace. Figure 6. (CMA*-75 SHOWN) NOTICE: The exhaust vent pipe must be supported every 4 feet. After making sure the length of the piping is correct glue all connections in place. : This CMA furnace has been designed to be installed as a direct ve
