Supply air compensation
When control is being applied to the return air or room air, the supply air temperature can be compensated. This compensation is used
avoid blowing air at too cold or too high a temperature when the control is in deadband mode (no heating or cooling requirement
calculated). This compensation is activated by parameter P157.
Proportional band P235
Supply air
compensation
lower limit P234
Supply air
compensation
upper limit P236
Proportional band P237
Low
threshold
fault P240
High
threshold
fault P241
Heating compensation
(%)
Cooling compensation
(%)
Supply air temperature
100%
0%
157
Supply air compensation in deadband = With or Without
234
Low supply air temperature compensation setpoint in deadband
235
Low supply air temperature compensation proportional band in deadband
236
High supply air temperature compensation setpoint in deadband
237
High supply air temperature compensation proportional band in deadband
The temperature upper and lower thresholds (P240 to P245) are used to trigger a fault if the temperature is outside of these limits.
240
Supply air temperature low limit threshold
241
Supply air temperature upper limit threshold
242
Return air temperature low limit threshold
243
Return air temperature upper limit threshold
244
Room temperature low limit threshold
245
Room temperature upper limit threshold
3.7 - Fan control
The controller runs the plug fans with an EC motor. The unit has one intake fan and one exhaust fan. Pressure sensors for measuring
the air flow rate are wired on the PLC.
The fans can be under constant duct flow rate control or constant duct pressure control.
Constant air flow control (P104)
The flow rate setpoints are configurable: Intake flow rate setpoints 1 / 2 (P112, P113) and exhaust flow rate setpoints 1 / 2 (P128, P129)
The PID for the intake motor control is managed via P114 to P116, and the exhaust motor control via P130 to P132
Intake flow
112
Air intake fan flow rate setpoint 1
113
Air intake fan flow rate setpoint 2
114
Air intake fan flow control PID proportional band (P)
115
Air intake fan flow rate control PID integral time (I)
116
Air intake fan flow rate control PID derivative time (D)
Extraction flow
128
Air extraction fan flow rate setpoint 1
129
Air extraction fan flow rate setpoint 2
130
Air extraction fan flow rate control PID proportional band (P)
131
Air extraction fan flow rate control PID integral time (I)
132
Air extraction fan flow rate control PID derivative time (D)
3 - FEATURES
19
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