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TEC3000 Series Single- or Two-Stage Economizer Thermostat Controllers Installation Instructions
16
5.
If the thermostat controller is in rooftop mode, press
Number of Heating Stages
and adjust the number of
heating inputs on the equipment being controlled.
6.
Press
to save and
to return to the previous screen.
Configuring Economizer
If the equipment has an analog (between 0 to 10 V) input for an economizer damper command, configure the
economizer as follows:
1.
Press the
Menu
icon.
2.
Press
Equipment Setup.
3.
Press
Economizer
.
4.
Press
Economizer Installed
and select
Yes
.
5.
Press
Min Position
and set to the percentage that the damper must be kept open to ensure fresh air flow in
the zone.
6.
Press
Closed Voltage
and set to the voltage output at which the damper is fully closed.
7.
Press
Opened Voltage
and set to the voltage output at which the damper is fully opened.
8.
Press
to save and
to return to the previous screen.
The TEC supports three methods of determining economizer availability. These are Dry Bulb, Single Enthalpy, and
Dual Enthalpy, in increasing order of accuracy. To run an economizer, outdoor air temperature (OAT) is required to
run in Dry Bulb mode. This can be provided by connecting a sensor to the OAT input on the TEC. It also can be
provided by writing to NET-OAT from a Building Automation System (BAS), which overrides the internal sensor. If
Outdoor Air Humidity (OAH) is also provided by writing to NET-OAH, then the single enthalpy method is used to
determine if economizer cooling should be used. Finally, if Zone Humidity (ZNH) is also provided by writing to
NET-ZNH, then the dual enthalpy method is used to determine if economizer cooling should be used.
All network overrides to the TEC work on a timeout basis. If the value is written to, it remains active as long as the
BAS writes a new value within 15 minutes of the first one. If the 15-minute timeout occurs without getting any data
written, the TEC stops using the network data
When operating in Dry Bulb or Single Enthalpy mode, it is necessary to provide a Dry Bulb Setpoint or an OA
Enthalpy Setpoint, respectively. The TEC ships with default values set, but depending on climate it may be
necessary to change these. To access these values:
1.
Press the
Menu
icon.
2.
Press
Equipment Setup.
3.
Press
Economizer
.
4.
Press
Dry Bulb Setpoint
or
OA Enthalpy Setpoint
and adjust according.
5.
Press
to save and
to return to the previous screen.
Setting the Control Mode
The Control Mode tells 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. This setting does not override equipment
lockouts, such as low or high outdoor temperature lockouts. To set the Control Mode:
1.
Press the
Menu
icon.
2.
Press
Control Setup
.
3.
Press
General
.