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Premium Commercial Controls
ERV
TEMPERING CONTROL
Example:
In this case 4°F = 100% which means that 1°F = 25%, which makes our calculation
easy. With the default settings, stage 1 turns on at 66.2 + 1 = 63.2. Stage 2 turns on at 66.2 +
3 = 65.2.
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 (stage 1) and cooling enable 2 (stage 2) are ON
u
Cooling demand, expressed as a percentage of proportional band
u
Cooling Status
Stage 1 turns on a 25% and
Stage 2 at 75% of prop band
Stage 2 turns off at 25% and
Stage 1 at 0% of prop band
Proportional Band
Se
Proportional Band
Setpoint
STAGE 1
OFF
TEMPERATURE
STAGE 2
OFF
0%
25%
75%
100%
STAGE 1
ON
STAGE 2
ON
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.
