Table of Contents
Advertisement
6) Measure the draft at the point where the vent connector attaches to the
heat exchanger flue pipe. With the burner operating, the stack draft
should not exceed 0.05 in. W.G. If the stack draft has been adjusted
above this value to give the proper overfire draft, the heat exchanger
will require cleaning.
If there is little or no stack draft, the chimney flue way may require
cleaning, the chimney is too restrictive, or a downdraft condition exists.
E. Symptom: Furnace blower will not start.
Items to check:
1) Confirm there is 120 VAC at the blower terminal labeld "HEAT" on the
oil furnace control.
2) If there is not 120 VAC at the blower motor terminal, measure the
voltage at the S1 terminal on the oil furnace control. If the fan can be
activated by itself from the room thermostat subbase, confirm it will
operate. If so, the oil furnace control may have a burnt or damaged
relay. Confirm and replace the control if necessary.
3) If there is 120 VAC at the blower motor terminal "HEAT", either the run
capacitor or blower motor may be damaged. Test and replace the
capacitor or motor, as required.
F. Symptom: Blower cycles on and off after the burner has shutdown.
Item to check:
1) Increase the fan off time by changing the DIP switch selections on
SW2. Refer to Table 2 for blower delay off settings.
NOTICE: If the high limit control is faulty, it should be replaced.
However, it must only be replaced by the same make and model
as the original. Refer to the electrical diagrams for proper
electrical connections.
29
Hide quick links:
Advertisement
Table of Contents
