Setting The Control Mode - Johnson Controls TEC3000 Series Quick Start Manual

Screen reset
The current screen returns to the home screen and turns
off if the current screen is not touched for 3 minutes.
Touch the screen to turn it on again. To disable the
screensaving option, press Display Settings and set
Enable Display Timeout to No.
Selecting the unit type
There are three unit types. They are:
• Four-pipe—This unit type has both heating and cooling
coils plus a supply fan. This configuration can also be
used on configurations that are heating or cooling only.
• Two-pipe—This unit type has a single set of pipes that
can serve hot or chilled water plus a supply fan. The
Supply Temp Type allows for the connection of an
analog sensor or an aquastat to a binary input. Based
on the water temperature or aquastat state, the unit
controls heating or cooling.
• VAV—This unit type is designed for a pressure-
dependent zone damper and the supply fan
outputs are disabled. The TEC senses the supply
air temperature coming from the unit. The Supply
Temp Type setting allows for the connection of an
analog sensor or binary duct thermostat. Based on
the air temperature or duct thermostat state, the zone
damper controls for heating or cooling. The TEC does
not control the unit delivering the air. The logic needs
to be part of another controller.
By default, the thermostat controller is configured for
four-pipe fan coil mode.
Selecting the heating and cooling
device type
By default, the thermostat is configured for On-Off
(2-position) control. This can be changed to Floating
(Incremental) mode when the Unit Type is not set to VAV.
For VAV mode, only floating actuators are supported and
this option is unavailable.
When in Floating mode, the Actuator Stroke Time must
also be set to match the equipment.
Configuring the supply fan - fan coil
only
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.
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 user configurable value of temperature
differential from setpoint. By default, the Medium Fan On
Diff Sp is set to 1.5, the Medium Fan Off Diff Sp is set to
0.5, the High Fan On Diff Sp is set to 2, and the High Fan
Off Diff Sp is set to 1.
For VSF control, the output is configurable 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 at which the fan begins
running, and Full Speed Voltage is the voltage output at
which the fan reaches full speed. 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 VDC, the Full Speed Voltage
is 10 VDC, and the Minimum Command is 20%.
When the variable speed fan is off, the FAN L binary
output is off and the voltage at the VSF output is 0 VDC.
When the fan turns on, the FAN L 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.

Setting the Control mode

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.
Setting the Fan mode - fan coil only
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
the home screen
disabling end-user controls. The Fan mode available to
the installer is dependent 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
• 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 Fan Override icon on the home screen depends
on the fan type. The following options are provided for
single- and variable-speed fans:
• On—Overrides the fan to be continuously on
• Auto—Follows the behavior set as Fan Mode
• Quiet—Follows the behavior set as Fan Mode, but
prevents the fan from ever going above minimum
speed. The Quiet option has no effect on equipment
with single-speed fans.
TEC3000 Series On/Off or Floating Fan Coil Thermostats Quick Start Guide
for information about enabling and
Customizing
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