Newmac WFA-85, Installation And Operating Manual

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Electrical Code, and with the regulations in C.S.A. Standard B365 “The Installation Code for Solid Fuel Burning
Appliances and Equipment” in Canada. In the U.S., this furnace must be installed according to NFPA-211,
“Standard for Chimneys, Fireplaces, Vents, and Solid-Fuel Burning Appliances”.
The flue pipe must be black 24 ga pipe minimum.
Flue pipe connections must be secured with metal screws and have as few elbows as possible. This furnace
should be installed by a qualified furnace serviceman.
CAUTION: The flue collar is sized so that a trade size flue pipe fits snugly inside it. Joints in flue pipes, including
the connection at the appliance and the chimney, shall have at least 30 mm (1 3/16 inch) over lap. Flue pipe
connections must be secured with at least 3 metal screws or an equivalent mechanical means; and be made
tight in accordance with good practice.
The flue products may contain carbon monoxide particularly when the wood fire is being starved for air (made
to burn at slow rate). Therefore, the flue pipe must seal tight and must not be inserted into the return air stream of
the circulating blower.
Wood storage should conform to local bylaws, and should not be within minimum clearances for combustible
surfaces as shown above.
NOTE: COMBUSTION AIR is Where fans are used in the fuel storage area, they should be installed so as not to
create negative pressures in the room where the solid fuel burning appliance is located.
OUTSIDE COMBUSTION AIR
Provision for outside combustion air may be necessary to ensure that fuel-burning appliances do not discharge
products of combustion into the building. Guidelines to determine the need for additional combustion air or not
may not be adequate for every situation. If in doubt, it is advisable to provide additional air.
Outside combustion air may be required if:
4. The solid-fuel-fired appliance does not draw steadily, experiences smoke roll-out, burns poorly, or back-drafts
whether or not there is combustion present.
5. Existing fuel-fired equipment in the building, such as fireplaces or other heating appliances smell and do not
operate properly, suffer smoke roll-out when operated, or back-draft whether or not there is combustion
present;
6. Any of the above symptoms are alleviated by opening a window slightly on a calm (windless) day;
7. The building is equipped with a well-sealed vapor barrier and tight fitting windows and/or has any powered
devices which exhaust building air;
8. There is excessive condensation on windows in the winter; or
9. A ventilation system is installed in the building.
If these or other indications that infiltration air is inadequate, additional combustion air should be provided from
the outdoors.
DUCT INSTALLATION
Not to be connected to ductwork that is still connected to another furnace. As the unit may be used as a gravity
furnace when the power is off, the following is recommended:
1. Locate the furnace as centrally as possible in the building so the best warm air distribution may be enjoyed.
2. Use an extended plenum (central duct) at least one size larger than called for in National Warm Air Standards.
3. Use a minimum pipe size of six inches diameter in runs and in no case smaller than five inches diameter.
4. Slope extended plenum’s and runs as much as possible to facilitate gravity flow of warm air.
BELT TENSION (FOR BELT DRIVE BLOWER MOTORS)
When adjusting to the proper pulley setting make certain that the belt is able to flex approximately one inch
without movement of the motor pulley.
IMPORTANT: This furnace must have a MINIMUM return air duct size equal to 250 sq. in. and a MINIMUM supply air
duct size equal to 180 sq. in. The supply air extended plenum should extend 8 – 10 feet out from the furnace, then
gradually transitioned to the end of the duct system to provide a .20” W.C. static pressure.
HUMIDIFIER
Install the humidifier in the return air plenum. This prevents possible damage due to excessive temperatures
when there is a power failure.
Metal connecting ducting from the warm air plenum is recommended rather than plastic ducting.