Setting The Control Mode - Johnson Controls TEC3000 Series Installation Manual

Configuring the supply fan - fan coil
only
About this task:
On two-pipe or four-pipe fan coil units, three different
types of supply fans are supported. These are single-
speed fans, multi-speed fans up to three discrete speeds,
and VSF using a 0 VDC to 10 VDC control signal and an
optional binary on/off command.
Note: Fan control is not available in VAV mode.
To select the fan type, complete the following steps:
1. Press the Menu icon.
2. Press Setup.
3. Press Equipment Setup.
4. Press Supply Fan.
5. Press Supply Fan Type and select Single Speed,
Multi-Speed, or Variable Speed.
Press Save and the back arrow to return to the
6.
previous screen.
For multi-speed fan control, you can adjust the point
when the medium or high speed turns on. The fan speed
is based on the load of the cooling or heating device, and
is a percentage between 0 and 100. By default, the Med
Speed On Cmd is 33% and the High Speed On Cmd is 66%.
When you only use two fan speeds, set the High Speed On
Cmd to 100% to disable the third speed. To adjust these
values, complete the following steps:
1. Press the Menu icon.
2. Press Setup.
3. Press Equipment Setup.
4. Press Supply Fan.
5. Press Medium Speed On Cmd and adjust
accordingly.
Press High Speed On Cmd and adjust accordingly.
6.
7. Press Save and the back arrow to return to the
previous screen.
For VSF control, you can configure the output for any
range between 0 VDC and 10 VDC. The parameters
are Start Voltage, Full Speed Voltage, and Minimum
Command. Start Voltage is the voltage output that the
fan begins to run at, and Full Speed Voltage is the voltage
output that the fan reaches full speed at. Minimum
Command is the percentage of the range between the
Start Voltage and the Full Speed Voltage. The fan does
not go below the minimum command when the fan is
turned on. By default, the Start Voltage is 2 V, the Full
Speed Voltage is 10 VDC, and the Minimum Command is
20%.
When the variable speed fan is off, the FAN binary output
is off and the voltage at the VSF output is 0 VDC. When
the fan turns on, the FAN binary output turns on and
the voltage at the VSF output begins controlling the fan.
When the VSF is configured for reverse acting mode,
when the Start Voltage is above Full Speed Voltage, the
VSF output is set to 10 VDC or the Start Voltage minus 1
VDC, whichever value is the lesser, when the fan is turned
off.
To configure the variable speed parameters, complete the
following steps:
1. Press the Menu icon.
2. Press Setup.
3. Press Equipment Setup.
4. Press Supply Fan.
5. Press Start Voltage and adjust accordingly.
6. Press Full Speed Voltage and adjust accordingly.
7. Press Minimum Command and adjust accordingly.
Press Save and the back arrow to return to the
8.
previous screen.

Setting the Control mode

About this task:
The Control Mode informs the controller to run in Cooling
only, Heating only, or Automatic mode, based on the
temperature in the zone relative to the heating and
cooling setpoints. Control Mode does not override
equipment lockouts or changeover. To set the Control
Mode, complete the following steps:
Press the Menu icon.
1.
2. Press Setup.
3. Press General Setup.
4. Press Control Mode and select Cooling, Heating,
or Auto as preferred.
5. Press Save and the back arrow to return to the
previous screen.
Setting the Fan mode - fan coil only
About this task:
The Fan Mode informs the controller how to handle
the fan. There are two options for fan configuration: a
Fan Mode available to the installer through the menu
system, and a fan override available as an option to the
end user from the Fan icon on the home screen. See
Customizing the home screen
and disabling end-user controls. The Fan Mode available
to the installer depends on the fan type. The following
options are provided for single and variable-speed fans:
• On—Fan is continuously on
• Auto—Fan cycles on demand with the controller
entering cooling, heating, or dehumidification modes
• Smart—Fan cycles on demand with the controller
entering cooling or heating modes during unoccupied
periods but is continuously running during occupied
and standby periods
The following Fan Mode options are provided for multi-
speed fans:
• Low—Fan is continuously on low
• Medium—Fan is continuously on medium
• High—Fan is continuously on high
• Auto—Fan cycles on demand with the controller
entering cooling, heating, or dehumidification modes
TEC3000 Series Proportional Fan Coil Thermostats Installation Guide
for information on enabling
15