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1.
When the installation is complete set both burner and solid fuel thermostats to the bottom of the scale.
2.
Close the supply switch and turn the solid fuel thermostat above room temperature. The draft fan should operate.
If this fails to happen, check (a) power supply, (b) voltage on secondary side of control relay – transformer, (c) correct
wiring hook up, (d) correct voltage at fan motor. If (a) to (d) check OK, the fan is defective.
3.
Open the line switch, turn the solid fuel thermostat to its lowest setting and the oil burner thermostat above room
temperature. Remove the air bleed plug from the pump (refer to Diagram attached to pump) (a) open oil supply valve, (b)
place a container in position to catch foam, (c) close the line switch and after pure oil is emitted, open the line switch and
replace bleed plug, (d) close the line switch and the oil burner should run normally after a few seconds.
4.
Adjust oil burner air control so that a # 1 or less smoke is arrived at by means of a smoke test. The damper in the wood
firedoor must be closed during this procedure. If a smoke tester is not available, slowly close the air adjustment until the
fire becomes smokey. Slowly open the air adjustment until there is a small amount of smoke on the flame tips.
5.
By means of the barometric draft regulator – adjust to a - .03 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. A flue gas analysis should be made
and the unit adjusted so that between a 8 % and 10 % CO
6.
The combination fan & limit switch is thermally operated. The limit side is connected in series to the power supply to the oil
burner. Because of blower failure, dirty filters or some other cause, the present limit will interrupt the power supply to the
burner. If the limit switch shuts the unit down it may be because of a common fault, not enough return air supply or a
supply air grill being covered by a rug.
The load side of a limit also supplies power to the transformer – relay. If the unit goes off on limit, the draft fan will shut off.
7.
The fan side of the combination control is adjustable with fan on and off fingers. If the furnace fan has been adjusted to
o
deliver a 75
F temperature rise (difference between return air and supply air) a setting of fan on 130
o
F is comfortable. The temperature rise in accomplished by speeding up or slowing down the fan by means of the
adjustable pulley on the fan motor. Maximum temperature rise is 85
The fan speed is adjusted at the factory to give a 75
resistance in duct work). Since most home duct work does not have resistance of the value the fan speed must be
adjusted by means of the following:
With the oil burner operating, place a thermometer in the warm air supply (place thermometer so that it cannot se the heat
exchanger) and measure the temperature after the unit has been operating for at least 5 minutes. (Be sure the blower door
is closed) measure the return air (at return air grill). If the difference is less than 75
motor pulley or is it is greater than 75
By means of the motor adjustment bracket, adjust the motor so that the belt may be deflected approximately one inch.
This adjustment is important as a tight belt causes excessive fan bearing wear, it uses more electricity and it is noisy.
If the above instructions are followed, continuous air circulation can be comfortably accomplished without the added
expense of a two speed motor, simply by using the manual fan switch on the face of the combination control.
8.
Before loading the solid fuel firebox, turn the thermostat up to insure that the draft fan is on: after the fire is established set
thermostat to desired temperature. IMPORTANT: Learn how to load your solid fuel box with wood (or coal (G model)) so
as to maintain a comfortable home temperature.
requirements.
9.
The oil burner thermostat on combination furnaces is generally set about 5
fuel thermostat is calling for heat, the draft fan is on. If the fuel has been depleted and cannot keep the temperature up,
the oil burner thermostat brings the oil burner on. The NEWMAC COMBINATION FURNACE has a relay that stops the
draft fan when the oil burner comes on, making the oil fuel side efficient, and making the furnace operate safely.
10. (a) By means of a slide Draft Control above the firedoor, you can control the amount of combustion air allowed into the fire
box. Move this slide plate to the open position that allows sufficient combustion air in for the type of solid fuel you are
burning. For coal it must be maximum; for wood it will vary with size and type. For added efficiency, when heating with oil
only, close the slide plate and adjust your solid fuel thermostat to its lowest temperature setting.
(b) FURNACE LABEL ILLUSTRATION
COMBINATION OPERATING INSTRUCTIONS
2
o
F temperature rise at a .20" W.C. or .25"W.C. static pressure (air
o
F close the pulley. In the majority of cases the fan must be slowed.
The amount of fuel required depends upon your home's heating
10
is registered.
o
F on models CL 115-170, and 75
o
0
lower than the solid fuel side. When the solid
o
F and off at 90
o
F on CL 86-96.
F slow the fan speed by opening the
o -
100
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