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UNIT (measuring unit)
By pushing the arrows, you will select the measuring unit that you wish to use (Fahrenheit or Celsius). Thereafter,
temperatures will be displayed according to your selection. After two minutes of inactivity on the keyboard, the
display will shut itself off. The UNIT selection has no impact on the operation of the furnace. It is simply a
preference chosen by the technician or the user of the product..
FAN (blower speed)
Using the arrows, increase or decrease the blower speed. You can choose from six preselected speeds. This
selection is very important for the modes COOL, MANU, or CIRC. There is a choice of 6 different speeds. Under
the COOL mode, the speed selected is the speed at which the distribution blower will work when a cooling demand
will be sent by the thermostat. Under the MANU mode, it is the speed at which the distribution blower will work
when a heating demand will be sent by the thermostat and that the hot air plenum will have reached its kick-in
temperature (KIP). Under the CIRC mode, it is the speed at which the distribution blower will run to circulate the air
inside the house during summer. The CIRC mode will also be used by the technician to manually select speed #4 in
order to balance the system upon installation of the furnace.
Note: The FAN selection is not necessary under the HEAT mode because it is the PC board #2 that automatically
chooses the speed at which the distribution blower runs in order to maintain the BEP inside the hot air plenum.
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