It is also acceptable to connect the selected motor speed with a
pig tail joined to both heating and cooling speed wires with a
wire nut. As a safety precaution against accidental disconnec-
tion of the wires by vibration, it is advisable to secure the wire
nut and wires with a few wraps of electricians tape.
CAUTION: Do not connect power leads between mo-
tor speeds. The neutral wire must always be con-
nected to the motor's designated neutral terminal.
WARNING: Disconnect the power supply to the fur-
nace before opening the blower access door to serv-
ice the air filter, fan or motor. Failure to shut off power
could allow the blower to start unexpectedly, creating
a risk of death or personal injury.
If the joining of the blower speed wiring is done in the furnace
junction box, tape off both ends of the unused wire.
Do not use the blower speed wires as a source of power to
accessories as electronic air cleaners and humidifier
transformers unless it is certain that only one motor speed
will be used. The unused motor taps auto--generate suffi-
ciently high voltages to damage accessory equipment.
MAINTENANCE AND SERVICE
Routine Maintenance By Home Owner
Other than remembering to arrange for the annual professional
servicing of the furnace by the service or installation contractor,
the most important routine service performed by the home
owner is to maintain the air filter or filters. A dirty filter can cause
the furnace to over--heat, fail to maintain indoor temperature
during cold weather, increase fuel consumption and cause
component failure.
The furnace filter(s) should be inspected, cleaned or replaced
monthly. The furnace is factory equipped with a semi--
permanent type filter. If the filter is damaged, replace with filters
of the same size and type. (See Page 5 for listing).
During the routine service, inspect the general condition of the
furnace watching for signs of oil leaks in the vicinity of the oil
burner, soot forming on any external part of the furnace, soot
forming around the joints in the vent pipe, etc. If any of these
conditions are present, please advice your service or installa-
tion contractor.
Annual Service By Contractor
CAUTION: The combustion chamber (firepot) is frag-
ile. Use care when inspecting and cleaning this area.
The heat exchanger should be inspected periodically and
cleaned if necessary. if cleaning is necessary, SHUT OFF
POWER TO THE FURNACE and remove the burner. Using a
stiff brush with a wire handle, brush off scale and soot from in-
side the drum and flue pipe. To clean the radiator, remove the
round covers on the inner front panel to gain access to the
cleaning ports.
When this procedure is done for the first time, carefully cut
away the insulation covering the opening with a sharp knife.
Loosen the nuts on the radiator clean--outs. DO NOT RE-
MOVE THE NUTS. Remove the covers carefully to avoid tear-
ing the gaskets. A wire brush can be used to loosen dirt and
debris on the inside surfaces of the radiator.
Clean out all accumulated dirt, soot and debris with a wire han-
dled brush and an industrial vacuum cleaner. Before replacing
the clean--out covers, inspect the gaskets. If the gaskets are
broken, remove the remnants and replace with new gaskets.
Snug the cleanout covers. DO NOT OVER--TORQUE THE
CLEAN--OUT NUTS. Replace the inner front panel clean--out
covers.
NOTE: A radiator clean--out assembly inadvertently
dropped into the interior of the furnace can usually be
easily retrieved with a magnet on a wire handle or
stout string.
The direct drive blower motor is factory oiled. Under normal op-
erating conditions it does not require oiling for the first two
years. Oil sparingly (a few drops) in each oil port with SAE 20
non--detergent oil. Oiling is most easily done with a “tele--
spout” oilier. This oiler has a long flexible plastic spout. DO
NOT OVER--LUBRICATE. Excess oil causes premature elec-
tric motor failure.
Inspect the blower fan. Clean if necessary.
Oil Burner Maintenance: Follow the instructions of the oil
burner manufacturer. (See oil burner manufacturer's instruc-
tions supplied with furnace). It is advisable to change the oil
burner nozzle and oil filter on an annual basis.
The venting system should be cleaned and inspected for signs
of deterioration. Replace pitted or perforated vent pipe and fit-
tings. The barometric damper should open and close freely.
All electrical connections should be checked to ensure tight
connections. Safety controls such as the high limit controls
should be tested for functionality. The fan control should be
checked to ensure that the “fan off” function continues to stop
the blower fan at temperatures between 90
°
F to 100
°
F.
OPERATING INSTRUCTIONS
Before Lighting
1. Open all supply and return air registers and grilles.
2. Open all valves in oil pipes.
3. Turn on electric power supply
To Light Unit
1. Set the thermostat above room temperature to call for
heat. The burner should start. NOTE: It may be necessary
to press the RESET button on the primary combustion
control relay.
2. After a short period of time, as the furnace becomes warm
enough the act upon the fan control (L6064A), or preheats
the bi--metallic element (L4064W), the blower should
start.
3. Set the thermostat below room temperature. The oil
burner should stop.
4. The air circulation blower will continue to run as long as the
temperature in the furnace is higher than the “FAN OFF”
setting on the fan control. Typical “fan on” values range
from 120° F to 130° F. Typical “fan off” temperatures range
between 90° F and 100° F. The fan control adjustments
may be altered if the air at the room registers is uncom-
fortably high upon blower start up or shutdown, the fan
control settings can be lowered.
5. The adjustments to the fan control settings should be
made by measuring the temperature of the air in the sup-
ply air take--off, or within the first few inches of the supply
air trunk. The side mid point of the transition is usually
ideal, providing that the thermometer probe is beyond the
“line of sight” wherein false readings from radiant heat
could be observed. The system temperature rise, the dif-
ference in temperature between the supply air and return
air, will typically range between 65° F and 70° F.
Unitary Products Group
9
035-14289-000 Rev. A (0701)
