Air Flow Selection - Hallmark Variable Speed 2 Stage Installation And Operation Instruction Manual

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. Hallmark 85 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
Burner Heating Air
Firing Rate
0.65 GPH
0.75 GPH
0.85 GPH
1.00 GPH
10
o o
F to 75 F temperature rise.
Cooling/
Flow Heat Pump
Tonage
975 CFM 2
1175 CFM 2-1/2
1275 CFM 3
1500 CFM 4
Air Flow
Y1-50%/Y1-75%
400/600CFM
500/750 CFM
600/900 CFM
800/1200 CFM
Air Flow Fan Only Air
Y/Y2 Flow
800 400 CFM
1000 500 CFM
1200 600 CFM
1600 800 CFM