Instructions / Assembly

ManualsBrandsMiller ManualsHeating, Ventilation, and Air ConditioningMobile Home 75,000 BTU Oil Hot Air Down-Flow Furnace

CMF2 80-PG CONVERTIBLE (65, 75, & 85 KBTU/H INPUTS)

CMF2 80-PO CONVERTIBLE (65, 75, & 85 KBTU/H INPUTS)

Counterﬂ ow Gas or Oil Heating Appliance

INSTALLATION INSTRUCTIONS

DO NOT DESTROY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

FIRE OR EXPLOSION HAZARD

• Failure to follow safety warnings exactly could

result in serious injury or property damage.

• Installation and service must be performed

by a qualiﬁ ed installer, service agency or the

gas supplier.

• Do not store or use gasoline or other

ﬂ ammable 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 not touch any electrical switch; do not

use any phone in your building.

• Leave the building immediately.

• Immediately call your gas supplier from a

neighbors phone. Follow the gas suppliers

instructions.

• If you cannot reach your gas supplier, call

the ﬁ re department.

WARNING:

ATTENTION INSTALLERS:

It is your responsibility to know this product better

than your customer. This includes being able to install

the product according to strict safety guidelines and

instructing the customer on how to operate and maintain

the equipment for the life of the product. Safety should

always be the deciding factor when installing this

product and using common sense plays an important

role as well. Pay attention to all safety warnings and

any other special notes highlighted in the manual.

Improper installation of the furnace or failure to follow

safety warnings could result in serious injury, death,

or property damage.

These instructions are primarily intended to assist

qualified individuals experienced in the proper

installation of this appliance. Some local codes require

licensed installation/service personnel for this type of

equipment. Please read all instructions carefully before

starting the installation. Return these instructions to

the customer’s package for future reference.

For installation in:

• Manufactured Homes

• Recreational Vehicles, Park Models, & Manufactured

Buildings

• Modular Homes/Buildings

Summary of content (32 pages)

PAGE 1
Counterflow Gas or Oil Heating Appliance INSTALLATION INSTRUCTIONS CMF2 80-PG CONVERTIBLE (65, 75, & 85 KBTU/H INPUTS) CMF2 80-PO CONVERTIBLE (65, 75, & 85 KBTU/H INPUTS) For installation in: • Manufactured Homes • Recreational Vehicles, Park Models, & Manufactured Buildings • Modular Homes/Buildings ATTENTION INSTALLERS: It is your responsibility to know this product better than your customer.
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TABLE OF CONTENTS Important Safety Information ....................................3 Requirements & Codes ..............................................3 Minimum Installation Clearances ..............................4 Combustion Air & Venting Requirements ................5 General Information...................................................6 Combustion Air Quality..............................................6 Direct Vent Furnaces .................................................
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IMPORTANT SAFETY INFORMATION INSTALLER: Please read all instructions before servicing this equipment. Pay attention to all safety warnings and any other special notes highlighted in the manual. Safety markings are used frequently throughout this manual to designate a degree or level of seriousness and should not be ignored. WARNING indicates a potentially hazardous situation that if not avoided, could result in personal injury or death.
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• The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00 and 5.00 for installation of through – the – wall vented gas appliances as follows: 1. For direct-vent appliances, mechanical-vent heating appliances or domestic hot water equipment, where the bottom of the vent terminal and the air intake is installed below four feet above grade the following requirements must be satisfied: a.
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• Sufficient clearance for unobstructed airflow through a louvered door must be maintained in order to achieve rated performance. Air return to the furnace must have the minimum required total free area: 200 in2 (1290 cm2 ) for furnace only. May also include return air grille and frame assembly P/N 902989 or wall mount grille P/N 902999). 235 in2 (1516 cm2 ) with 4 ton A.C. or H.P. installed. 250 in2. (1613 cm2 ) with 4 ton A.C. or H.P. installed & 1” special clearance.
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General Information (LP) gas. The firing rate of the CMF2 80 Convertible Series can be field-installed using a certified NORDYNE conversion kit by a qualified service technician. Refer to page 6 for conversion information. WARNING: This furnace must be installed by a qualified installing agency and in accordance with applicable local codes and ordinances that govern this type of equipment.
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is a manually reset switch. DO NOT install jumper wires across these switches to defeat their function or reset a switch without identifying and correcting the fault condition. If a switch must be replaced, use only the correct sized part specified in the Replacement Parts List provided online. Manufactured Housing Installations For all manufactured housing applications, the CMF2 furnace must be vented using the SRJ series roofjack.
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damper. All flue pipe joints should be fastened with sheet metal screws for rigidity. The chimney height, required draft, and number of appliances served by the chimney must be in accordance with all applicable codes. To prevent down draft, the chimney should extend at least 2 feet above the peak of the roof. See Figure 1. 3 FEET MIN. ROOF JACK ASSY. ROOF CAP ASSY. DRAW BAND FLEX DUCT CEILING TRIM COLLAR It is recommended that the furnace flue serve no other appliances.
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CIRCULATING AIR REQUIREMENTS WARNING: All supply ducts must be secured to the furnace with sheet metal screws and adequately sealed. When supply air is provided through the bottom of the unit, the joint between the furnace and the plenum must be air tight. The surface that the furnace is mounted on must provide sound physical support of the furnace with no gaps, cracks or sagging between the furnace and the floor or platform.
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a retaining bracket. It is recommended that the filter be cleaned or replaced monthly. Newly built or recently renovated homes may require more frequent changing until the construction dust has minimized. • Replacement filters are available at most local retailers. Inspect filters frequently and replace when necessary with filter of same dimensional size. Filters designed to remove smaller particles such as pollen, may require additional maintenance.
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• The dimensions of the room or alcove must be able to accommodate the overall size of the unit and the installation clearances in Table 1 (page 4). Physical dimensions for this furnace are shown in Figure 18 (page 29). • The unit must be leveled at installation and attached to a properly installed duct system. • The surface that the furnace is mounted on must provide sound physical support of the unit. MA-200 Base Installation The MA-200 base is designed for O.E.M.
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the top of the base pan and seal that flange with metal tape. NOTE: If using a “V” or “U”-box crossover system, use manufacturers instructions for installation details. Installing the Furnace on an MA-200 Base 1. Carefully lift the furnace over the base pan and set into position. The flange on the back of the furnace should rest on the inside rails of the base. 2.
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Combustion Air Duct/Pipe Installation The CMF2 furnace must draw the combustion air from outside (except for special installations) and requires using the 2”X7” rectangular combustion air duct provided in the MA series base kit or the direct vent kit. See Table 2 (page 6) for special combustion air installations. NOTE: If using the direct vent kit, the kit must be installed before the furnace is positioning on the base. Follow the instructions provided with the kit.
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RA-S4 4/1 14" Removable SRJ3, SRJ4, & SRJ5 25" Removable All -C Models 2 RA-S3 RA-S2.5 3/12 Adaptor 49" to 59" SRJ5 37" to 48" SRJ4 25" to 36" SRJ3 13" to 24" SRJ2 2-1/2 /12 None Flat 12" or Less SRJ1 When roof pitch is: Use Adaptor Model No. 1/2 Minimum Furnace CMF Series Ceiling Trim Plates When Ceiling Cavity is: Use Roof Jack Model No.
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FUEL CONNECTIONS Gas piping - PG Series Only WARNING: FIRE OR EXPLOSION HAZARD • Failure to follow safety warnings exactly could result in serious injury or property damage. • Installation and service must be performed by a qualified installer, service agency or the gas supplier. • 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.
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joint or union using a small paintbrush. If any bubbling is observed, the connection is not sealed adequately and must be retightened. Repeat the tightening and soap check process until bubbling ceases. required that you measure the gas input rate. This may be accomplished in the usual way, by clocking the gas meter and using the local gas heating value. To check the input of the furnace see page 21. IMPORTANT NOTE:When pressure testing gas supply lines at pressures greater than 1/2 psig (14 inch W.C.
PAGE 17
Regulator Converter Gas Control Knob U-Shaped Manifold let In Orifice Figure 12. LP & Natural Gas Conversion Oil piping - PO Series Only The following procedures are recommended as good practice. However, requirements of local codes and ordinances, H.U.D. Manufactured Home and Safety Standards or National Fire Protection Association must be satisfied, where they apply, for an approved installation.
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3/8" Oil Supply Line Gauge Vent with Cap 2" Duplex Bushing 2" Fill Guide pipe Note: Additional venting may be required if tank is filled rapidly. Drain End of Oil Supply Line 3" to 5" Above Bottom Drain Figure 13. Recommended Tank Hook-Up 200 - 300 Gallon Tank ELECTRICAL CONNECTIONS WARNING: ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in serious injury or property damage.
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CMF 80 PG Convertible CMF 80 PO Convertible Factory Set Firing Rate (btu/hr)* 75,000 75,000 Heating Capactiy (btu/hr) 56,000 60,000 Kit Converted Firing Rate (btu/hr)** 65,000 or 85,000 65,000 or 85,000 AFUE Rating (%) 75+ 80+ Orifice Number (Natural Gas) 20 N/A Orifice Number (Propane Gas) 40 N/A Burner Nozzle for Oil N/A 0.60 gph; A; 80o Blower D x W Motor H.P. - Speed -Type Motor FLA Fuse or Breaker Nom. Anticipator Setting 10 x 7 10 x 7 1/4 -3 -PSC 1/4 -3 -PSC 6.0 6.
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START-UP & ADJUSTMENTS Important Safety Information WARNING: All safety information must be followed during the start-up and operation of the furnace. Unqualified individuals should not attempt to interpret these instructions. Improper servicing could result in dangerous operation, property damage, personal injury or death. WARNING: FIRE OR EXPLOSION HAZARD • Failure to follow safety warnings exactly could result in serious injury or property damage.
PAGE 21
Checking the Input of the Furnace Refer to the furnace rating plate to determine the firing rate of the furnace. Using Table 4 (page 19), determine the appropriate orifice size for the firing rate and gas being used in your application. Check the burner orifice to ensure that it is the correct size. The input of this furnace can be checked using the following steps: 1. Shut off all other gas fired appliances. 2. Start the furnace run it for at least 3 minutes. 3.
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WARNING: Do not attempt to drill the gas orifices. Use only factory supplied orifices. Improperly drilled orifices may cause fire, explosion, carbon monoxide poisoning, personal injury or death. At 2,000 feet, the NFGC requires that this appliance be derated 4% for each 1,000 feet of altitude. For example, the input needs to be reduced 8% at 2,000 feet, 12% at 3,000 feet, etc. This furnace can be derated by reducing the orifice size or decreasing the manifold pressure.
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burner motor (orange) control terminal by splicing or adding tab adapters. Seal and isolate any bare wires. See Figure 16. Firing Rate Conversion The rated firing rates of the CMF2 80 convertible furnaces (PO & PG) can be adjusted from the factory setting of 75,000 BTU/hr. The firing rate can be changed to either 65,000 BTU/hr or to 85,000 BTU/hr using the appropriate certified NORDYNE conversion kit installed by a NORDYNE distributor or Service PRO.
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• If control locks out 3 times, the control enters restricted lockout. To reset: Honeywell R7184: hold down the reset button for 45 seconds until the LED flashes once. Beckett 7505: hold down reset button for 15 seconds until the red light turns off and the yellow light turns on. 3. After flame is established, the ignition remains ON for 10 seconds to ensure flame stability. It then turns off (interrupted ignition). 4. The circulating air blower will energize and the temperature fan switch will close. 5.
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24 volts supplied to gas valve during ignition but no main gas flow. • Gas valve may be defective. Replace if necessary. • Gas piping may be plugged. Check for adequate gas supply to gas valve at union. Main flame ignites but burner locks out. • Ignition control is not properly grounded. WARNING: When replacing the ignition control, replacement control must have the safety lockout time. FAILURE TO FOLLOW THIS WARNING MAY RESULT IN AN EXPLOSION. • Defective ignition control.
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7. If the burner stays running, the system is operational. 8. If the (LED indicator for R7184 control; green LED for 7505 control) is off, check the cad cell assembly after disconnecting the line voltage. See Table 9. Honeywell R7184 Control Indicator LED Status On Cad cell is sensing flame (could be flame or stray light) Off Cad cell is not sensing flame Flashing (1/2 sec. on, 1/2 sec. off) Flashing (2 sec. on, 2 sec.
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UNIT MAINTENANCE WARNING: Shut off all electrical power to the unit before performing any maintenance or service on the system. Failure to comply may result in personal injury or death. NOTE: All servicing of this heating appliance other than the normal maintenance described in this section must be done by authorized trained service personnel. Do not attempt any servicing which requires opening of the control panels.
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FIGURES & TABLES 1 1 4 16 2 9 1 2 5" 2 1 8 18 23 5 8 2 1 4 4" 13 5 8 11 5 8 24 57 31 8 11 6 5 8 1 4 Figure 17.
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BLACK BURNER RECEPTACLE AIR LIMIT HIGH VOLTAGE LOW VOLTAGE 5 5 4 4 3 3 BLACK BLACK WHITE BLACK ORANGE 2 2 1 1 RED 3 2 1 BLACK BLOWER MOTOR BLACK FAN ON/OFF SWITCH LEGEND: FIELD WIRING BLACK CMF2 Furnace BLUE DECK LIMIT 6 6 WHITE BLACK L1 N High Black Low Med.
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LOCATION OF FURNACE COMPONENTS Heat Exchanger Blower Motor Capacitor Blower Assembly Control Panel Door Switch Gas Valve Control Control Circulating Air Blower Oil Pump Base Figure 19.
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INSTALLATION / PERFORMANCE CHECK LIST ELECTRICAL SYSTEM: ATTENTION INSTALLERS: It is your responsibility to know this product better than your customer. This includes being able to install the product according to strict safety guidelines and instructing the customer on how to operate and maintain the equipment for the life of the product. Safety should always be the deciding factor when installing this product and using common sense plays an important role as well.