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Provides critical safety warnings, including procedures for gas leaks and general handling.
Details input and output ratings for different CMF furnace models.
Covers initial equipment checks and adherence to installation codes and regulations.
Ensures adequate air supply for safe and efficient furnace operation.
Specific venting requirements applicable to manufactured home installations.
Venting requirements and procedures for residential applications.
Specifies minimum required spacing from surrounding materials for safe installation.
Instructions for installing automatic shut-off dampers in the venting system.
Specifies conditions for closet return air openings and system design.
A guide to selecting appropriate roof jack models and accessories for installation.
Step-by-step instructions for connecting the vent pipe to the roof jack assembly.
Critical procedures and requirements for installing gas supply lines.
Recommended procedures for installing oil supply lines and tank connections.
Instructions for connecting the single-line oil supply system.
Instructions for connecting the two-line oil supply system.
Illustrates the electrical connections for the main furnace unit.
Shows the electrical connections specific to the PGB power gas burner.
Ensuring correct voltage, frequency, and phase for power supply.
A step-by-step guide for connecting the main power supply to the appliance.
Recommendations for thermostat location, wiring, and anticipator adjustment.
Instructions for adjusting blower operation and safety limit settings.
Detailed procedures for safely starting and operating PG direct ignition gas burners.
Table to determine the correct gas orifice size based on firing rate and gas type.
Adjusting gas valve controls and air shutters for optimal burner performance.
Step-by-step guide to convert the furnace from natural gas to LP gas.
Instructions for initial oil burner start-up and removing air from the fuel line.
Procedures for adjusting the firing rate of the CMF oil furnaces.
Step-by-step description of the heating cycle for gas furnaces.
Step-by-step description of the heating cycle for oil furnaces.
Diagnosing problems related to the burner motor and ignition system.
Explains status light indications for gas furnace lock-outs and faults.
Explains status light indications for oil furnace lock-outs and faults.
Troubleshooting steps for issues preventing the burner from starting.
Methods for checking the cad cell resistance for proper 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 | CMF 100-PO |
| Category | Heating System |
| Language | English |
