Newmac CL 86C - Belt Tension; Duct Installation; Oil Fired Blocked Vent Switch - Model WMO-1

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5. There is excessive condensation on windows in the winter; or
6. A ventilation system is installed in the house.
If these or other indications that inltration air is inadequate, additional combustion air should be provided from
the outdoors.
BELT TENSION
When adjusting the proper pulley setting make certain that the belt is able to ex at least one inch without
movement of the motor pulley.
DUCT INSTALLATION
To prevent excessive noise and temperature rise, limit the minimum return air duct size to at least 250 square inches
(in2). Because 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 in diameter in runs and in no case smaller than ve inch diameter.
4. Slope extended plenum and runs as much as possible to facilitate gravity ow of warm air.
Minimum Duct Sizes
Model Return Air Supply Air Static Pressure
CL86/96 250 sq. in. 180 sq. in. .20” W.C.
CL115 250 sq. in. 220 sq. in. .20” W.C.
CL140 250 sq. in. 220 sq. in. .20” W.C.
CL155 280 sq. in. 240 sq. in. .20” W.C.
CL170 300 sq. in. 260 sq. in. .25” W.C.
The provided chart gives the MINIMUM free area duct size. The supply air extended plenum should be 8 – 10 feet
out from the furnace with the sizes shown in the chart, then gradually transitioned to the end of duct system. If
the plenum is lower than 24 inches high, increase the duct size proportionately. The Supply Air free area for CL-115
C&G is the same as CL-140 C&G because the wood burning portion of the furnace can produce 140,000 BTU.
HUMIDIFIER
Install humidier 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 should be used.
OIL FIRED BLOCKED VENT SWITCH - MODEL WMO-1
Refer to the Newmac and Field Controls Instructions enclosed in the WMO-1 package.
Do not use the WMO-1 Blocked Vent Switch with the Newmac SVS Sealed Vent System
When installed on the chimney vent or on the appliance burner plate according to these instructions, the
manually reset WMO- 1 blocked vent switch is designed to shut off power to the oil burner if the hot ue gases
in the chimney vent connector pipe back up sufciently to activate it. The WMO-1 switch is required on new
Newmac oil-red and combination furnaces or boilers installed in Canada. It must be installed by a qualied
installer in accordance with the manufacturer’s installation instructions. Electrical wiring must be in accordance
with applicable codes and the Canadian Electrical Code. Before leaving the appliance check that the WMO-1
switch and its cover are tightly secured.
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