7. Blower Setting

The blower speed must be set to give certified 85F temperature rise across the heat exchanger. Inadequate airflow from a slow blower speed could cause limiting problems and a shutdown of the Forced Draft Fan.

 

1.    Correct blower speed will also optimize flue gas temperatures.

2.    Two speed blower operation not recommended in solid fuel system.

3.    For belt drive blowers insure that the belt tension allows 1-1/2” to 2” of free play.

4.    The circulation blower located inside furnace casing will turn ON and OFF automatically during heating cycle due to Fan Limit Control (See section 9).

      Blower will run for varying lengths of time depending on heat output of fire.

 

8. Filters

Plugged air filters could restrict airflow and cause furnaces to operate above CSA approved 85F temperature rise across heat exchanger. This could cause limiting problems and a shutdown of the Forced Draft Fan.

·      Electronic Air cleaners not recommended with solid fuel systems.

 

9. Fan/Limit

The eight inch (8”) Fan/Limit provides two (2) functions:

 

·      Fan - Correct On /Off operation of the circulation blower in the furnace.

·      Limit - Safety device to shutdown the Forced Draft Fan (or combination  burner) if the plenum temperatures become too high.

 

If the Fan/Limit is defective or is not sensing in the proper plenum location either of its functions can be affected.  Approved Fan/Limit settings are:

 

CL 86/96 C/G Fan Off  = 95F    Fan On = 130F    High Limit = 180F

CL 115-170 C/G       Fan Off  = 95F    Fan On = 130F    High Limit = 210F

WAO/GAO                 Fan Off  = 95F    Fan On = 130F      High Limit = 200F

WB/WG 100              Fan Off  = 100F  Fan On = 140F   High Limit = 180F

 

·      Button should be pulled out to Automatic setting

·      WG100 and WB100 have Fan/Limit already installed directly on furnace.

 

Combination Furnaces

Wood Add Ons

 

The WAO/GAO products can only be added to an OIL furnace with a firing range of 0.75-1.10 usgph

9. Maintenance

The build up of creosote and soot on the inside of the heat exchanger will promote further deposits. More importantly these layers will lower the heat transfer to the supply plenum or bonnet.  A daily inspection of the inside of the heat exchanger should be carried out to insure that any material build-up is removed from interior surfaces.

 

 

·      There should be a major cleaning of the heat exchanger in the Spring with the bricks removed to clean out ash deposits in this section. All inside surfaces should be cleaned prior to summer shut down.

9. Maintenance (cont.)

 

·      The flue pipe should be regularly removed and back section of heat exchanger cleaned.

·      In WB/WG100 and WAO/GAO the Scandinavian Baffle inside firebox will have to be regularly flipped to maintain a flat profile

 

10 . Mild Weather Operation.

 

During moderate temperature fluctuations normally experienced in the Fall and Spring the back up heating system should be used.  The use of small fires for low heat output will cause a smoldering fire and promote creosote build up. The wood furnace should be used when prolonged cold outdoor temperatures are established.

 

11. Thermostats

 

There are a wide variety of thermostats available with varying functions. A low cost or standard mercury bulb thermostat will provide satisfactory control of home temperature in a solid fuel system.

 

In a single zone forced air system the thermostat(s) should be installed on the main floor in a central location following manufacturer’s instructions.

 

 Do not place thermostat in areas which may affect its operation such as:

·      Near cold air return grills

·      Above lamps, tube radios or TV’s

·      Near a radiator or warm air register

·      Behind closed door or other obstructions affecting air across the thermostat

·      Near a window or door frequently opened to the outside

·      Excessive vibrations

 

Avoid sources causing abnormal sources of radiant, convection or conduction heat.

 

Air temperatures can vary within a home by 5 to 10 F from room to room or from floor to ceiling. The thermostat will provide a relative temperature reading that will provide a comfortable range of temperatures throughout the home.  A heat loss is important to provide the optimum system design for a comfortable home environment.

 

It is normal to experience ‘warmer’ home temperatures when heating with wood. The furnace blower will operate automatically to cool the heat exchanger. The air temperature will usually be 5 to 10F higher than when heating with oil. If lower home temperatures are desired when burning wood:

 

·      Smaller fires can be built (See Section 2)

·      Slide draft settings adjusted to minimize combustion air entering the firebox

(See section 3)

·      Lower draft with Barometric Draft Regulator( See section 4)

 

Recommended thermostat anticipator settings:

                                                                                    Combination            Add On

Wood Thermostat              0.4 amps              0.4 amps

Oil Thermostat                    0.4 amps              0.2 amps

Note: An amperage of 25 volts or greater will short out anticipator destroying thermostat and warranty. Disconnect thermostat wire until ready for operation.

 

 

Duties and Responsibilities

 

Any solid fuel installation is guided by CSA B365 Installation Code for Solid Fuel Appliances. Combination furnaces also follow the requirements of CSA B-139  Installation Code for Oil Fired Equipment. However local authorities will have the final say on any regional code requirements.

 

1.    It is the installer’s responsibility to make certain that the equipment operates according to the manufacturer’s instructions and that all safety devices function properly. In Canada the W.E.T.T. course is recommended for all installers.  Test equipment for wood burning furnaces should include draft meter, stack thermometer and duct thermometer.

 

2.    All operation procedures and warranty instructions should be reviewed with the homeowner emphasizing regular maintenance and correct operating procedures.

 

3.    More details on wood burning tips and facts are located in the Newmac  Installation, Operating and Service Manual.

 

4.    Newmac WAO or GAO  Add On units can only be used with an oil fired forced air furnace rated between 0.75-1.1 gph

 

5.    Newmac assumes no liability for either the use or misuse of recommendations in this general information guide.

 

The Future Maintenance

 

To reduce environmental impact burn wood at optimum temperatures, clean furnace regularly, and be vigilant in energy conservation practices in the home.

 

To reduce environmental impact dispose of used mercury thermostats at a certified environmental depot.

 

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