29
START-UP
Cooling with EconomizerONE System
For Occupied mode operation of EconomizerONE system, there
must be a 24-v signal at terminals R and OCC (provided through
PL6-3 from the unit's IFC coil). Removing the signal at OCC
places the EconomizerONE control in Unoccupied mode. See
Table
A in Appendix A — “Troubleshooting” on page 30 for
damper position control and other troubleshooting.
During Occupied mode operation, indoor fan operation will be
accompanied by economizer dampers moving to Minimum Po
-
sition setpoint for ventilation. If indoor fan is off, then dampers
will close. During Unoccupied mode operation, dampers will
remain closed unless a Cooling (by free cooling) or DCV de
-
mand is received.
When free cooling using outside air is not available, the unit cool-
ing sequence will be controlled directly by the space thermostat.
Outside air damper position will be closed or Minimum Position
as determined by Occupancy mode and fan signal.
When free cooling is available as determined by the appropriate
changeover command (dry bulb, outdoor enthalpy, differential dry
bulb or differential enthalpy), a call for cooling (Y1 closes at the
thermostat) will cause the economizer control to modulate the
dampers open and closed to maintain the unit supply air tem
-
perature. Default supply temperature is 53°F (12°C), with a
range of 38°F to 70°F (3.3°C to 21.1°C). Compressor will not
run.
Should 100% outside air not be capable of satisfying the space
temperature, space temperature will rise until Y2 is closed. The
economizer control will call for compressor operation. Dampers
will modulate to maintain SAT at set point concurrent with Com
-
pressor 1 operation. The "Low T Temp" setting [default 32°F
(0°C)] will lock out compressor operation.
When space temperature demand is satisfied (thermostat Y1
opens), the dampers will return to Minimum Damper position if
indoor fan is running or fully closed if fan is off.
If accessory power exhaust is installed, then the power exhaust fan
motors will be energized by the economizer control as the damp-
ers open above the EXH1 SET setpoint and will be energized as
the dampers close below the EXH1 SET setpoint. Damper move
-
ment from full closed to full open (or vice versa) will take between
1-1/2 and 2-1/2 minutes.
Heating with EconomizerONE System
During Occupied mode operation, indoor fan operation will be
accompanied by economizer dampers moving to Minimum Po
-
sition setpoint for ventilation. If indoor fan is off, then dampers
will close. During Unoccupied mode operation, dampers will
remain closed unless a DCV demand is received. When the
room temperature calls for heat (W1 closes), the heating con
-
trols are energized.
Refer to Appendix A “Troubleshooting” on page 30, Appendix B
“SEQUENCE OF OPERATION EXAMPLES” on page 31, and
Appendix C “MODBUS ADDRESSES” on page 34 for Trouble-
shooting operation issues.
Table 25 — Enter Running State
PARAMETER DESCRIPTION
8RUN STATE Change to Running State. Press Enter to confirm the change.
8ENTER RUN? Confirm the change to Running State.
8FACTORY DEF
Perform factory reset. Press Enter to confirm the reset. (This action resets the controller
password to default: OneBT.)
8DEF CONFIRM? Confirm the factory resetting.
8ACT CNT RESET Damper count reset.
8VER x.x.x Firmware version information such as 0.1.10.
Table 26 — Enter Configuration State and Restart
PARAMETER DESCRIPTION
5CONFIG STATE Change to Configuration State. Press Enter to confirm the change.
5ENTER CONFIG? Confirm the change to Configuration State.
5RESTART Restart the economizer controller. Press Enter to confirm the restart.
5CONF RESTART Confirm the restart.
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