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General safety precautions for operating the appliance.
Emergency procedure for gas leaks.
Overview of the furnace series and models.
Inspect the unit for damage and completeness upon delivery.
Requirements for installation codes and regulations.
Ensuring adequate air supply for operation.
Specific venting guidelines for manufactured housing.
Specific venting guidelines for residential settings.
Steps for testing the venting system's functionality.
Installation procedures for MA-200 and MA-100 bases.
Required space around unit for safety & service.
Connecting the combustion air supply duct.
Installing an automatic shut-off damper.
Positioning the furnace onto its base.
Installing the CB-200A cottage base.
Requirements for installing the furnace in a closet.
Installing the SRJ series roof jack.
Connecting the vent pipe to the roof jack.
Venting the furnace through an existing chimney.
Installing the optional air quality accessory.
Connecting the gas supply piping for PG models.
Determining appropriate pipe length by diameter.
Connecting the oil supply and return lines.
Ensuring airtight connections for oil supply.
Specifying compatible fuel oil grades.
Visual guide to electrical connections.
Connecting the main power supply.
Selecting location and wiring the thermostat.
Adjusting blower and limit controls.
Warnings before lighting or operating gas burners.
Actions to take if gas is smelled.
Steps to start and operate the gas burner.
Verifying correct gas input and orifice.
Checking inlet and manifold gas pressures.
Understanding controls & converting to LP gas.
Adjusting air shutter and checking burner settings.
Step-by-step operation of the gas furnace.
Steps to start the oil burner.
Removing air from the oil supply line.
Steps to turn off the oil burner.
Adjusting flame quality & electrode positioning.
Changing ignition duty mode.
Adjusting the burner's firing rate.
Step-by-step operation of the oil furnace.
Balancing heat output to different rooms.
Safety and handling during servicing.
Diagnosing motor & ignition system problems.
Diagnosing flame ignition & safety lockout.
Diagnosing insufficient heat & burner operation.
Interpreting fault codes for gas/oil furnaces.
Specific troubleshooting for R7184 control.
Testing cad cell resistance for flame sensing.
General safety precautions for operating the appliance.
Emergency procedure for gas leaks.
Overview of the furnace series and models.
Inspect the unit for damage and completeness upon delivery.
Requirements for installation codes and regulations.
Ensuring adequate air supply for operation.
Specific venting guidelines for manufactured housing.
Specific venting guidelines for residential settings.
Steps for testing the venting system's functionality.
Installation procedures for MA-200 and MA-100 bases.
Required space around unit for safety & service.
Connecting the combustion air supply duct.
Installing an automatic shut-off damper.
Positioning the furnace onto its base.
Installing the CB-200A cottage base.
Requirements for installing the furnace in a closet.
Installing the SRJ series roof jack.
Connecting the vent pipe to the roof jack.
Venting the furnace through an existing chimney.
Installing the optional air quality accessory.
Connecting the gas supply piping for PG models.
Determining appropriate pipe length by diameter.
Connecting the oil supply and return lines.
Ensuring airtight connections for oil supply.
Specifying compatible fuel oil grades.
Visual guide to electrical connections.
Connecting the main power supply.
Selecting location and wiring the thermostat.
Adjusting blower and limit controls.
Warnings before lighting or operating gas burners.
Actions to take if gas is smelled.
Steps to start and operate the gas burner.
Verifying correct gas input and orifice.
Checking inlet and manifold gas pressures.
Understanding controls & converting to LP gas.
Adjusting air shutter and checking burner settings.
Step-by-step operation of the gas furnace.
Steps to start the oil burner.
Removing air from the oil supply line.
Steps to turn off the oil burner.
Adjusting flame quality & electrode positioning.
Changing ignition duty mode.
Adjusting the burner's firing rate.
Step-by-step operation of the oil furnace.
Balancing heat output to different rooms.
Safety and handling during servicing.
Diagnosing motor & ignition system problems.
Diagnosing flame ignition & safety lockout.
Diagnosing insufficient heat & burner operation.
Interpreting fault codes for gas/oil furnaces.
Specific troubleshooting for R7184 control.
Testing cad cell resistance for flame sensing.
This document provides comprehensive instructions for the installation, operation, and maintenance of Counterflow Gas or Oil Heating Appliances, specifically the CMF80-PG Convertible, CMF100-PG, CMF80-PO Convertible, and CMF100-PO models. These furnaces are designed for manufactured housing, recreational vehicle, and residential applications, offering flexibility in fuel type (power gas or power oil) and, for the CMF80 Convertible Series, adjustable firing rates.
The CMF series furnaces are high-quality, direct-vent heating appliances. They are designed to provide forced-air heating for various dwelling types. The "PG" models are power gas units, capable of operating with either natural gas or propane (LP) gas, while the "PO" models are power oil units. A key feature is their convertibility between power oil and power gas, allowing for adaptation to different fuel availability or preferences. For the CMF80 Convertible Series, the firing rate can also be adjusted using a certified conversion kit, offering flexibility in heating capacity.
The furnace operates by drawing combustion air, either directly from outside the home (direct vent) or from the conditioned space, depending on the installation type. The combustion air is then mixed with fuel (gas or oil) and ignited to produce heat. A blower circulates the heated air through a duct system to warm the living space. The flue products are exhausted to the outside, ensuring safe operation.
The gas furnace operating sequence involves a call for heat from the thermostat, which energizes the combustion blower motor. After a safety start check and ignitor warm-up period, the gas valve opens, and the ignitor ignites the gas. Flame rectification principles detect the flame, and if successful, the ignitor de-energizes while the gas valve remains open. The circulating air blower then energizes to distribute heat. If flame is not detected, the control attempts re-ignition before locking out. The oil furnace operating sequence, particularly with the Honeywell R7184 Control, also begins with a call for heat, followed by a brief delay for a safe start check. The ignition and motor turn on, and a flame should establish within a lockout time. If flame is not sensed, the control shuts down on safety lockout and requires manual reset. Once flame is established, the ignition remains on briefly for stability, then turns off (interrupted ignition), and the circulating air blower energizes.
The furnaces are certified to UL307 standards (UL 307A for oil models; UL 307B for gas models), ensuring compliance with safety regulations. They can be installed in various configurations, including manufactured housing and residential settings, with specific requirements for base types (MA-100, MA-200 Universal Base, CB-200A Cottage Base) and flue product exhaustion (NORDYNE SRJ Roofjack or existing chimney).
For gas models, the appliance is shipped from the factory for natural gas but can be converted to LP gas using a specific procedure involving orifice replacement and regulator converter adjustment. The air shutter setting for the burner is factory pre-set but may need adjustment during firing rate conversion to ensure optimal combustion efficiency and prevent carbon monoxide production.
The control system includes a fan and limit switch with three levers: FAN ON, FAN OFF, and LIMIT OFF. These levers control the blower operation, with recommended factory settings for energizing (FAN ON at 110°F) and stopping (FAN OFF at 90°F) the blower to prevent circulation of cool air. A LIMIT OFF lever acts as a safety stop, factory-set at 160°F, and should not be adjusted. An auxiliary manual reset limit is also included to protect against blower motor failure.
Room thermostat requirements specify placement approximately five feet above the floor in an accessible living or adjoining room, preferably on an inside wall, away from abnormal heat sources (sunlight, radios, TVs, lamps) or cold drafts (outside walls, stairwells, windows). The heat anticipator of the thermostat should be adjusted to .4 amps for power oil models and .9 for power gas direct ignition models.
Regular maintenance is crucial for safe and efficient operation. The manual outlines several key maintenance tasks:
The document stresses the importance of following all instructions, local codes, and ordinances to ensure safe and proper operation, warning against improper installation, alteration, service, or maintenance, which can lead to injury, property damage, fire, or asphyxiation hazards, and void the warranty.
General| Brand | Nordyne |
|---|---|
| Model | CMF80-PG |
| Category | Heating System |
| Heating Capacity | 80, 000 BTU |
| Efficiency | 80% AFUE |
| Weight | 120 lbs |
| Fuel Type | Natural Gas |
| Vent Size | 4 inches |
