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DN-Series Integrated Programmable Controls
DOAS
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:
u
as selected if in occupied operation
u
RA for unoccupied operation
u
Coil Leaving Temperature in dehumidification mode if reheat is used (heating
or HGRH)
u
Supply temperature in dehumidification mode if reheat is not used
u
Cooling setpoint which will be:
u
Occupied cooling setpoint if in occupied operation, not dehumidification
u
Unoccupied cooling setpoint if unoccupied operation
u
Coil Leaving Temperature setpoint if dehumidification mode and reheat is used
u
Dehumidification setpoint if dehumidification mode and reheat is not used
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
