Setting the Mechanical Cooling Mode (C mech)
This setting determines whether to allow the operation
of mechanical cooling if the free cooling (economizer)
cannot maintain the cooling setpoint.
•
Selecting
off
means the mechanical cooling never
operates at the same time as the free cooling. This
option typically applies when the mixed air
temperature sensor is installed after the
mechanical cooling coils.
•
Selecting
on
enables mechanical cooling to
operate when the free cooling (economizer)
cannot maintain the cooling setpoint. This option
typically applies when the mixed air temperature
sensor is installed before the mechanical cooling
coils.
To set the mechanical cooling mode while in the
Installer Configuration Menu:
1.
Answer NO to all prompts until the mechanical
cooling mode prompt appears in the display.
Press YES to enter the mechanical cooling mode
menu.
2.
Use the UP/DOWN arrow keys to choose
on
or
off
. Press YES to store the selection.
The display now shows the mixed air setpoint menu.
See
Setting the Mixed Air Temperature Setpoint
(Mix stpt)
section for instructions.
Setting the Mixed Air Temperature Setpoint
(Mix stpt)
The mixed air temperature setpoint establishes the
mixed air temperature when operating in the
economizer mode. The economizer is adjusted
accordingly to maintain the mixed air temperature
setpoint.
The mixed air temperature setpoint is adjustable from
50 to 90
°
F (10 to 32
°
C).
To adjust the mixed air temperature setpoint while in
the Installer Configuration Menu:
1.
Answer NO to all prompts until the mixed air
setpoint prompt appears in the display. Press
YES to enter the mixed air setpoint menu.
2.
Use the UP/DOWN arrow keys to adjust the
mixed air setpoint. Press YES to store the
temperature.
The display mixed air temperature prompt is now
displayed. See
Displaying the Mixed Air Temperature
(Display)
section for instructions.
Displaying the Mixed Air Temperature (Display)
(Only Available if Mixed Air Temperature Sensor is
Installed)
The mixed air temperature can be displayed if a mixed
air temperature sensor is installed. The temperature
can be used to help service and troubleshoot the
equipment and economizer operation. The mixed air
temperature is only accessible through the installer
configuration menu.
To access the mixed air temperature while in the
Installer Configuration Menu:
1.
Answer NO to all prompts until the display mixed
air temperature prompt appears in the display.
Press YES to display mixed air temperature.
2.
The mixed air temperature is displayed. After
about 45 seconds, the T600MEP-2 returns to the
Status Display Menu or press YES to advance to
the exit menu display. The exit menu appears.
3.
Press YES to exit the Installer Configuration
Menu or press NO to return to the beginning of
the menu (digital input configuration).
Operation
Programming/Operating the T600MEP-2
Once the T600MEP-2 is configured through the
Installer Configuration Menu, the thermostat’s
operating parameters can be programmed through the
Main User Menu (access the Main User Menu by
pressing the MENU key during normal thermostat
operation). The Main User Menu contains the basic
operating features of the T600MEP-2.
The Main User Menu uses Auto Help. Auto Help is
displayed automatically in the Main User Menu when
there is a pause in programming activity. To exit Auto
Help, continue with the programming selection.
When the thermostat is in the Main User Menu and is
left unattended for 45 seconds, it reverts to the Status
Display Menu.
Follow the steps in Table 4 to program the
T600MEP-2.
12
T600MEP-2 Programmable Economizer Thermostat Installation Instructions
