the Installation of Warm Air Heating and Air-Conditioning Systems” apply. If changes are made to the
installation of the oil furnace, for Canada this shall comply with C.S.A Standard 139, “Installation Code of Oil
Burning Equipment”. If changes are made to the installation of the oil furnace, for the U.S. this shall comply with
NFPA 31, “Standard for the Installation of Oil-Burning Equipment.”
This furnace is certified for series connection to the outlet only of an existing Oil fired furnace. This furnace
may be added to an oil furnace having an oil input as shown on the original name plate between .75 GPH
minimum and 1.10 GPH maximum for “Inline” duct connection as shown in FIG. 8.
Do not use duct elbows having an inside radius of less then 150 mm (6 in).
Install brick in firebox according to FIG. 6. After brick is in position place 2” of sand in bottom of firebox. (Use pit
sand only.)
Connect wiring according to appropriate Wiring Diagram – FIG. 10, 11, 12 or 13.
Do not use a manual flue damper with this furnace. Optimal draft should be controlled by means of the supplied
barometric draft regulator – adjust to a -.03 to -.05 draft at the chimney. This must be done by means of a draft
meter. The maximum draft is not to be more than -.05 as damage can result to the furnace when used as a
gravity unit. The test must be made between the flue collar on the furnace and the draft regulator.
Newmac requires a minimum 7” round or equivalent rectangular or square flue (inside dimension). The minimum
flue connector size is also 7” diameter. The specified draft must be available at all times, even in the mildest
weather in which the furnace is operated. It is the responsibility of the installer to ensure there is enough draft in
all cases.
Flue pipe connections must be secured with metal screws and have as few elbows as possible. Fuel storage
should conform to local bylaws. This furnace should be installed by a qualified furnace service technician.
When installed as an add-on (supplementary) furnace: MAY BE CONNECTED TO DUCTWORK THAT IS
STILL CONNECTED TO ANOTHER APPLIANCE.
When installed as an add-on (supplementary) furnace return air ducts are not required to be constructed of
metal.
CAUTION: Do not connect ductwork so that a reverse flow is possible. Do not relocate any of the safety
controls in the original installation. Install this Add-on unit only on a furnace duct system and chimney, which
are in good operating condition.
AIR TEMPERATURE RISE:
1. Before any changes have been made to the system, measure the temperature rise across the existing
oil furnace.
2. With the oil furnace firing and after it has reached a stable state, measure the return air temperature (T
1
)
with a thermometer inserted into return air ducting. The thermometer should be far enough back along
the duct so it cannot “see” any part of the heat exchanger and pick up radiant heat.
3. Also, measure the supply air temperature (T
2
) with a thermometer in a similar way so no radiant heat is
picked up by the thermometer.
4. Subtract T
1
from T
2
. This is the temperature rise across the oil unit.
5. After installing the add-on unit, fire the oil furnace again and measure both the return air temperature
(T
1
) and the supply air temperature (T
2
) again.
6. Adjust the speed of the oil furnace blower to give the same temperature rise after the Add-on is installed
as was originally observed before any changes were made to the system
7. The electrical current flow through the blower motor must be maintained within the name plate rating. A
larger horsepower motor may be used to accomplish this.
NOTE: The blower of the oil furnace shall not be changed. There can be a large lag in the reading of many
commercially available thermometers. This should be checked by observing the time required for correct
temperature indication when the thermometer is immersed in boiling water.
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