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Premium Commercial Controls
ERV
52
TEMPERING CONTROL
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.
Aux Heat Mode
OA temp is cold enough that the auxiliary heat is used.
IN HEAT MODE
Valve is positioned for heat mode.
IN COOL MODE
Valve is positioned for cool mode.
Valve Positioning
Reversing valve is positioning. Not heat or cool is on during
this time.
The heat pump status values are shown. Multiple values may be true.
6.4.2 Heat Pump 2-Stage: with or without 0–10VDC Aux Heat
This type requires cooling type 2-stage and heating type HP 2-Stage.
6.4.2.1 Heat Pump 2-Stage Mode
The mode is determined by the outdoor temperature and the heating and cooling lockout
temperature settings.
6.4.2.2 Heat Pump 2-Stage Cooling Operation
This type of cooling 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.
If in cooling mode, and the unit calls for cooling, it puts the tempering mode output used for
a reversing valve, in the cool position and after a delay, will turn the compressor on and off to
maintain the cooling setpoint.
