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Premium Commercial Controls
ERV
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.
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.
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
6.5 ECONOMIZER CONTROL (BYPASS/FREE COOLING)
All ERV units that are equipped with a bypass damper allow the incoming air bypass the
enthalpic plate.
The economizer settings are:
u
Temperature
u
Enthalpy
u
Disabled
Economizer based on Temperature Sequence:
When the OA temperature is below the RA temperature less the hysteresis value, the
economizer will bypass the core with incoming air.
The economizer will be locked out when:
u
The OA temperature is less than the economizer adjustable low lockout.
u
The RA temperature is below the adjustable low lockout
u
Heating is enabled
