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DN-Series Integrated Programmable Controls
DOAS
6.5.4.3 Dual Temperature Coil Heating Operation
This type of heating modulates a 0–10VDC cooling command output using PI control to maintain
the heating setpoint. The KP and Ti can be adjusted to fine tune the control. The NO4 cooling
enable contact is engaged whenever the heating demand is at 1% or higher.
NOTE: The valve
control can be set
directly from the
BMS if you change
Valve control to BMS.
6.5.4.4 Dual Temperature Coil System Monitoring
This screen is available for monitoring the system in
Unit Status
.
The Dual Temperature Coil status values are shown. Multiple values may be true.
MESSAGE
MEANING
Cool Locked Out by OA
The cooling OA lockout is lower than the OA temperature.
Unocc Mode
Unit is in unoccupied mode (BMS or scheduler).
Unocc Cool
Unit is in unoccupied cooling.
Unocc Heat
Unit is in unoccupied heating.
Heat Locked out by OA
The heating OA lockout is higher than the OA temperature.
Lockout Overlap
The OA lockouts for heating and cooling overlap. (No vent mode.)
The heating takes preference.
Dehumid Mode
Unit is in dehumidification mode.
Econ Only
If economizer is open less than 100%.
Econ Mode
If in economizer mode.
Unit OFF
Unit is off.
Set BMS Heat/Cool!!
In order to work properly, the BMS must be set to give a heat/
cool command.
BMS Mode set to Heat
BMS is setting the mode to heat. No cooling is allowed.
BMS Mode set to Cool
BMS is setting the mode to cool. No heating is allowed.
IN HEAT MODE
Valve is positioned for heat mode.
IN COOL MODE
Valve is positioned for cool mode.
TEMPERING CONTROL
