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• OdU (Outdoor Unit) is the cooling mode. While OdU is on
the LED Display, press the OPTION button to go into the
cooling menu.
- “
” means 1 stage and one compressor outdoor
unit(when this is selected a call for Y2 second stage
cooling is ignored.
- “
” means 2 stage and one compressor outdoor
unit.
• To rotate from “
” to “
”, keep pressing the OPTION
button. If you have a Single stage unit, while the LED
display is showing “
”, press MENU. This will set the
indoor unit to be for single stage cooling.
• If you have 2 stage cooling, select “
” by pressing the
MENU button. This will set the indoor unit to be for 2
stage cooling.
• COP is the tap selection for cooling. When “
” has been
selected, the blower speed setting can then be selected.
Press OPTION again and again to scroll through the
selections. Blower tap setting 1-9 are available for single
stage cooling. The default is set at 6.
• The cooling speed will then flash on the LED. By pressing
the OPTION, the available cooling speed taps will be
displayed which are 1-9. Press MENU to select the
blower tap setting that is displayed. For example, if C1.7
is displayed, press MENU and it will be stored as the
Cooling mode selection for the blower.
• When “
” has been selected, the blower speed setting
can then be selected. Press OPTION again to scroll
through the selections. The default is set at 6 for 1stage
cooling and 7 for stage 2 cooling.
• Press OPTION to select the blower tap setting that is
displayed. For example, if C1.7 is displayed, press MENU
and it will be stored as the cooling blower tap selection for
the blower for 1st stage cooling.
• The control LED will then immediately prompt for 2nd
stage cooling blower tap to be set. The LED will show
the allowable blower tap settings by pressing OPTION
again and again. After the desired blower tap setting for
2nd stage cooling is displayed, press MENU to save the
selection. For example, if C2.8 is displayed, press MENU
and it will be stored as the 2nd stage cooling setting.
NOTE:
The second stage cooling tap setting cannot be lower
than the 1st stage setting. For example, if 1st Stage cooling
is 1.7, then 2nd stage cannot be 2.7 or lower. Also, Tap 9
cannot be used for 1st stage cooling because there is not a
higher setting for 2nd stage cooling.
NOTE:
If the unit is operating while changing the blower tap
setting, the new blower tap setting will change upon the next
call for the cooling sequence.
Cooling off Delay(COd)
This is an option on the board but cannot be changed. The
default for the cooling off delay is 45 seconds.
Selecting the (Gas) Heating Speed
NOTE:
Power must be applied to the board or the unit can
be functioning to change the blower speed.
NOTE:
The installer will have to review the blower tables (
• When the furnace does not have a call for heating,
cooling or fan, the 3 digit display will show “1dL” which
means “idle”.
• Press the MENU button, the control will show the options
on the display. Keep pressing the MENU button, the
options are Err-L6F-Cr-Cod-OdU-HOd-COF-COP-HtP-
rUn.
• HTP is the gas heat mode blower tap selection. While
HTP is on the LED display, press the OPTION button to
show the current blower tap selection. Default is Tap 5.
• When Option is pressed again and again, the control will
rotate through the blower motor tap choices. Blower taps
1-9 are available in heating mode.
• The default blower tap speed is set at 5. H1.1 would be
Tap 1, H1.2 is Tap 2 H1.3 is Tap 3, H1.4 is Tap 4, H1.5
is Tap 5, H1.6 is Tap 6, H1.7 is Tap 7, H1.8 is Tap 8 and
H1.9 is Tap 9.
• Once the desired blower Tap is displayed on the board,
push MENU to store the selection. For example, if H1.6
is displayed, press MENU and it will be stored as the Gas
Heat mode selection for the blowe.
NOTE:
If the furnace has a call for heat while changing the
blower tap setting, the new blower tap setting will change
upon the next call for the heat sequence.
Review the blower tables (
) for proper blower tap settings for gas heat.
Selecting Heat Off Delay (HOd)
This function is to change the time the blower will be energized
once the call for heat(W1) has completed.
NOTE:
Power must be applied to the board or the unit can
be functioning to change the Heat Off Delay.
1. Press the MENU button, the control will show the options
on the display. Keep pressing the MENU button, the
options are Err-L6F-Cr-Cod-OdU-HOd-COF-COP-HtP-
rUn.
2. HOd is the Heat Off Delay selection. While HOd is on
the LED display, press the OPTION button to select the
Heat Off Delay. The LED display will show the current
Heat Off Delay. The default is 100 seconds.
3. The choices are 60,100,140 and 180 seconds. Press
OPTION again and again to scroll through the choices.
Once the desired setting is on the LED display, press the
MENU button to save the new setting.
Determining Nominal System Capacity
In order to select the appropriate airflow for AC operation,
the nominal system capacity must be known. The nominal
system capacity is ALWAYS the nominal capacity of the
outdoor unit. In some cases, the nominal system capacity
is not the same as the nominal capacity of the indoor coil.
For maximum capacity and energy efficiency, generally a
selection at or near the top of the CFM range for that nominal
system capacity is best. For maximum dehumidification, select
an airflow near the middle or bottom of the CFM range for
that nominal system capacity.
NOTE:
If coil icing is observed, the cooling airflow may be
set too low. Make sure the setting selected is within the
range shown. Also, verify the system is properly charged
(see outdoor unit installation instructions). If icing continues
to occur, raise the selected airflow.
System Operation
(Gas) Heating Mode
When the thermostat calls for heating, the circuit between
R
and
W
is completed. The furnace control board initiates
the ignition sequence. Approximately 30 seconds after the
