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TWO-STAGE COOLING---TWO-STAGE HEATING: Many HVAC systems
incorporate a two-stage compressor for cooling and two-stage heating systems.
If this is the case, the HVAC system will usually run at 50% of volume in the first
stage mode and then ramp up to 100% of volume in the second stage mode.
This unit also recognizes these variations. When wiring this unit to a two-stage
cooling system you will need to take the Y/Y2 wire from the thermostat/HVAC
unit and wire this to the yellow position on the terminal strip in the unit. When
wiring this unit to a two-stage heating system you will need to take the W/W2
wire from the thermostat/HVAC unit and wire this to the white position on the
terminal strip in the unit.
NEVER CHANGE THE TAP BOARD SETTINGS WHEN THE MOTOR IS RUNNING
TAP BOARD SELECTOR VOLUME CONTROL
The tap board is mounted on the adapter panel at the factory. The black wire
from the terminal strip is connected to the 24 VAC tap on the board. This should
ALWAYS be connected. Please check this connection. The other four taps on
the board are for speed/volume settings for the blower in the off-demand or fan
only running cycles (low, med, high, max). The twin orange wires from the
harness are connected to the low tap from the factory. This means in an off-
demand or fan only (non-demand) mode the blower will run at 30% of volume.
The medium setting is 50% of volume, the high setting is 80% of volume and the
max setting is 100% of volume. For best operational performance and lowest
operating costs we recommend either the low or medium settings. NOTE: In any
case, the lowest tap board setting can be no higher than the lowest running
volume of the variable speed HVAC system.
TESTING THE UNIT
To ensure that all the control wiring is correct, cycle through the heat and
cool settings on the thermostat and make sure the air filtration unit runs at the
correct volumes in conjunction with the HVAC unit. Don't forgetifyouwantto
makeanadjustment on the tap board you must first turn off the unit before
switching to another setting. If you have any problems or questions please
call us at: 800-869-8025.
ODOR ADSORPTION MODELS
All Odor Adsorption models are identical to the regular models except there is
no HEPA filter. In-lieu of the HEPA filter there is a carbon cannister.