Boyertown Regal Oil Fired Furnace Variable Speed 2 Stage ECM Motor - Manual (Page 10)

operate through the heating cycle at the air flow as adjusted by the heating DIP switch. When
a call for heat is initiated the blower will turn on after a 90 second delay to ensure warm
plenum temperatures as the furnace heats up. The blower then runs at a reduced rate for 3-1/2
minutes before increasing its speed to the full air flow requirements.
When the call for heat is satisfied the blower will continue to operate at a reduced rate for a
period of 3 minutes to remove all of the usable heat from the furnace while still maintaining
the plenum temperatures at a comfortable level.
ECM Motor Air Flow Selection
Air flow settings for both heating and cooling are made by setting the heating and the cooling airflow
DIP switches to the proper location. These DIP switches are located in the 4 x 4 junction box
mounted directly under the fan center relay. Do not change the air flow settings until the blower has
come to a complete stop. No change in air flow will occur unless the motor has been allowed to a
complete stop.
See figure below for the location of the heating and cooling DIP switches. HB750 shown as typical.
Do not adjust the heating air flow below the firing rate of the furnace. The air flows for heating are
designed to give a 70
o F to 75 o F temperature rise.
Burner
Firing Rate Heating Air
Flow
Cooling/
Heat Pump
Tonage
Air Flow
Y1-50%/Y1-75%
Air Flow
Y/Y2
Fan Only Air
Flow
0.60 GPH 900 CFM 2 400/600CFM 800 400 CFM
0.75 GPH 1100 CFM 2-1/2 500/750 CFM 1000 500 CFM
0.85 GPH 1250 CFM 3 600/900 CFM 1200 600 CFM
1.00 GPH 1550 CFM 4 800/1200 CFM 1600 800 CFM
1.25 GPH 1925 CFM 5 1000/1500 CFM 2000 1000 CFM
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