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Premium Commercial Controls
ERV
46
The cooling 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.
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.
6.3.3.2 2-Stage: Two Stages of Cooling
If this is a two-stage heat pump, see
Combined Tempering
.
The mode is determined by the outdoor temperature and the cooling lockout
temperature settings.
This type of cooling turns cycles two stages of cooling to maintain the cooling setpoint. You
must set a prop band value. This value represents 100%; the wider the prop band the slower
the response. Then you specify the “on point” for stages one and two in percentages. Stage
one will turn off at setpoint and stage two will turn off at the on point for stage one. There is
also a minimum on and off time to prevent over-cycling.
TEMPERING CONTROL
The cooling status can be monitored in the
Unit Status
. The screen shows:
u
Cooling Control Variable which will be supply or return air, as selected.
u
Cooling setpoint
u
Whether cooling enable 1 is ON
u
Cooling Status
