Conventional Terminal Connections; Led Indicators; Soft Disable - Lennox 10T50 Installation And Setup Manual

Conventional Terminal Connections

Table 8. Conventional Terminals
Label Description
1st - stage heat output (1st stage gas heat output when configured as IFC
W1
and 1st stage electric heat output when configured as AHC.
2nd - stage heat output (2nd stage gas heat output when configured as IFC
W2
and 2nd stage electric heat output when configured as AHC.
3rd - stage heat output (3nd stage electric heat output when configured as
W3
AHC)
Indoor blower control (continuous fan) (monitoring only). G input may be
G connected to IAQ devices such as LVCS, HRV or ERV to turn the indoor
blower on and off.
Y2 2nd - stage compressor output
Y1 1st - stage compressor output
24VAC dehumidification signal output. The DS terminal is powered when
DS
there is not a dehumidification call.
Class II, 24VAC transformer
C
common
Class II. 24VAC transformer
R
power
H 24VAC humidifier signal output
Heat pump reversing valve
O
(24VAC = cool)
Heat pump reversing valve
B
(24 VAC = heat)

LED Indicators

This control has two green LED to indicate status and communication
activity One LED is labeled Status and the other is labeled RSBUS.
The RSBus LED flashes when information is being communicated over the
RSBus.
The following table lists all status LED information.
Function
R and C terminals are used to receive
power from the indoor unit and capable
of provid ing the power to the EIM and all
the associated loads. The R power in-
put uses a 3A fuse (Lennox part number
25J4901.
Used as reversing valve output for heat
pumps. The EIM uses a single-pole dual
throw relay to generate O and B signals.
Normally the O output is open and B out-
put at 24VAC during heating calls. During
cooling calls O is 24VAC and B open. With
relay de- energized 24VAC is present on O
terminal.
When power off/ or control reset, 24VAC
power shall not be present on the O ter-
minal.
RSBUS LED
Status LED
Table 9. Status LED (Green)
Green LED Function / Description
Remains steady ON until the device sends its start-up mes-
Steady On
sage.
Blinks 3 second OFF and 1
Soft disable state
second ON
Service is being provided (W, Y or G relay is
Blinks 2 second ON and 2
second OFF
ON, or G input ON
Blinks 1 second ON and 1
Alarm is present.
second OFF

Soft Disable

Soft disabling is when the iComfort
such as a indoor or outdoor unit control, iHarmony
Equipment Interface Module (EIM) on the system communication bus. The
thermostat sends the unknown control a message to go into soft disable
mode until component is properly configured.
The iComfort thermostat will not show any code for a soft disabled control.
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When soft disabling occurs only the control that has been disabled will
display the blinking LED status. In this case, the control blinks three
seconds OFF and one second ON.
Use the following procedure if the equipment interface module is displaying
the soft disable code.
1. Confirm proper wiring between all devices such as thermostat, EIM,
indoor and outdoor unit).
2. Cycle power to the control that is displaying the soft disable code.
3. Touch the Lennox icon on the thermostat home screen and hold until
the installer warning screen appears.
4. Touch yes to continue.
5. Touch Setup and then confirm to continue.
6. Use this Thermostat? Touch press here to continue.
7. Touch the next button to continue past the next three screens.
8. From the System Devices list, touch reset ALL to reset all devices.
9. Touch the confirm button.
The thermostat will reboot and start through the setup process again.
8
thermostat finds an unknown control
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zoning system or
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