Operating instructions

8. Inspect the door’s braided gasket for wear and damage. Replace when necessary with braided gasket of the same material and size. See
repairs parts section of this manual.
9. Now inspect and clean the oil burner.
OIL BURNER CLEANING
NOTE: These are general instructions for cleaning an oil burner. For specifics, consult the burner manufacturer’s instructions
1. Make sure all electrical power to the boiler/burner and the fuel supply to the burner are shut off.
2. With the swing door open, clean any soot accumulations from the end of the burner and if applicable burner head.
3. Remove the burner drawer assembly, clean the electrodes and then reset the electrode spark gap per the manufacturer’s recommendations.
4. Replace the oil nozzle with the exact same size and type recommended for use on this boiler.
5. Reinstall the burner drawer assembly making sure the head location (and size if applicable) are per the manufacturer’s recommendations.
If the burner being used has a damaged head, replace the head with the exact same head recommended for use on this boiler.
6. Inspect and clean the oil burner blower wheel.
7. Remove the oil pump cover and clean/replace the pump screen. Carefully reassemble ensuring the pump cover makes a good seal.
8. Securely fasten the swing door shut.
9. Replace the fuel filter (if applicable).
10. Reconnect the electrical and fuel supplies.
11. Fire the burner, checking for proper combustion using combustion test equipment and making adjustments as necessary.
12. Ensure that all safety controls and operating controls are functionally properly.
IMPORTANT: KEEP BOILER AND AREA AROUND IT CLEAN. NEVER BURN REFUSE OR ANY MATERIAL OTHER THAN
THE SPECIFIED FUEL IN BOILER. HAVE BOILER CHECKED EACH YEAR BY A QUALIFIED TECHNICIAN.
PROCEDURE 7—SEQUENCE OF OPERATION-
Refer to Fig. 19 and the wiring diagram shown in Fig. 14 while reviewing sequence of operation.
A. Boiler with Tankless Coil
HIGH LIMIT CONTROLLER
The high limit contacts open and turn burner off when boiler water temperature reaches high limit set point. The high limit automatically resets
after boiler water temperature drops past set point and through fixed 10° differential.
LOW LIMIT AND CIRCULATOR CONTROLLER
On a boiler water temperature rise, with the adjustable differential set at the minimum setting of 10°, burner circuit contacts RB break and circulator
circuit contacts RW make at low limit set point. On a boiler water temperature drop of 10° below set point, the RB circuit makes and RW circuit
breaks.
At any differential setting greater than 10°, the RB make and RW break temperature remains the same (control setting minus 10°). The RB break
and RW make temperature is the set point temperature plus the difference between differential setting and 10°.
The low limit control fires burner to maintain boiler water temperature at low limit setting (set point plus adjustable differential setting minus 10°).
While boiler water temperature is below low limit setting, circulator is prevented from operating, giving preference to domestic hot water
requirements. Once boiler water temperature rises to low limit setting, thermostat controls firing of burner and operation of circulator pump as
follows:
Fig. 18—Removing Soot
A95609
—18—