20, Sequence Of Operation; 21, Final Check Out; 22, Operating Instructions; 23, Maintenance And Service - Nordyne O4MD Installation, Operation And Maintenance Manual

20. SEQUENCE OF OPERATION
.
.
3.
.
.
.
.
8.
Room temperature drops, the thermostat calls for
heat.
The oil burner starts, ignition begins.
The cad cell detects light from combustion,
disconnects the primary control safety circuit,
allowing combustion to continue.
The bi-metallic element in the fan/limit control starts
the fan within 30 seconds.
The furnace continues to operate and will eventually
reach "steady state", the point at which the system
temperature stabilizes. (The furnace does not
become any warmer).
Room temperature rises; the thermostat is satisfied,
and the thermostat heating contacts open.
The oil burner stops.
The furnace temperature cools causing the fan
control contacts to open; the circulating fan stops.
9. The furnace remains idle until the next call for heat.
.
.
Set the thermostat below room temperature. The oil
burner stops.
The air circulation blower continues to run until the
furnace cools.
To Shut Down Unit
1. Set the thermostat to the lowest possible
setting.
2. Set the manual switch (if installed) in the
Electrical Power Supply Line to "OFF".
NOTE: IF THE FURNACE IS TO BE SHUT DOWN FOR
AN EXTENDED PERIOD OF TIME, CLOSE
THE OIL SUPPLY VALVE TO THE BURNER.
I_WARNINGI
IF THE FURNACE FAILS TO IGNITE, CHECK
THE OIL TANK FUEL GAUGE. IF THE FUEL
GAUGE SHOWS THAT OIL IS PRESENT,
PRESS THE RESET BUTTON ONCE ONLY. IF
THE BURNER FAILS TO IGNITE, CONTACT
YOUR SERVICE CONTRACTOR.
21. FINAL CHECK OUT
Ensure that all safety devices and electrical components
have been set for normal operation. Ensure that all
electrical connections are tight and that the wiring is
secure.
The furnace should be operated for a minimum of 15
minutes to reach steady state conditions before fine
tuning combustion. The warm up time is ideal for testing
the oil pump pressure.
Re-sample the flue gas for draft, [Bacharach] smoke,
CO2 or 02 content, and temperature. If the results are
satisfactory, make note of them and leave them with the
furnace. They constitute a baseline that may be helpful
for future diagnostics.
22. 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 starts.
2. After a short period of time, as the furnace warms,
the circulating fan starts.
IACAUTION I
ALL FURNACE CONTROLS ARE SENSITIVE
AND SHOULD NOT BE SUBJECTED TO
TAMPERING. IF PROBLEMS PERSIST, CALL
YOUR SERVICE CONTRACTOR.
23. MAINTENANCE AND SERVICE
A: 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 homeowner 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.
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 installation contractor.
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