AERMEC HRC - 4 Control Logic; Anti-Freeze through Flow Rate Modulation

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4 CONTROL LOGIC
The table below highlights the control logics enabled for each heat recovery unit functioning mode:
FUNCTION
FUNCTIONING MODE
Auto Manual Aux
Anti-freeze through ow rate modulation x x x
Anti-freeze through electric resistance x
Freecooling x x
Steriliser lamp activation x x x
Coil control for air post-treatment x x x
Resistance control for air post-treatment x
Room air cleaning function x
CF contact ventilation forcing x x
4.1 ANTI-FREEZE THROUGH FLOW RATE MODULATION
During winter functioning, the recovery unit provides for the modulation of the air ow rate introduced so as to prevent the formation of frost in the exchanger and the exten-
sion of the operating limit up to -10 [°C] of outdoor air.
Outdoor Air
(fresh air)
Indoor air
(recovery)
Air expelled
(spoiled)
Air inlet
(delivery)
Outdoor sensor (SAE)
The fresh ow rate modulation is functionally linked to the TSAE according to the following relationships:
PI = Po1 * PMAX * Ci(T)
Where “Ci” is the correction of the inlet ow rate in relation to the outdoor air temperature (curve highlighted in the following paragraph)
0
10
20
30
40
50
60
70
80
90
100
-
15 -14 -13 -12 -11 -10 -9 -8 - 7 -6 -5 -4 -3 -2 -1 0
T
SAE
Ci(T)