Control Features; Control Logic - Daitsu HRD EC Serie Manuel D'utilisation

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
Automatic / manual fan speed selection
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Changeover floating valve management
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Heating floating valve management
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Water coil antifreeze management
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Modulating electric heater management (PWM)
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Filter pressure switch management
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Fan management by CO
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Fan management by 1 pressure sensor
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By-pass damper management
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Boost function
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Alarm management and diagnostic
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Post ventilation
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Clock program management
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Remote display with internal temperature sensor
BMS Modbus protocol RS485
In the following diagrams is explained the summer-winter control logic
Tsp-Treg
Ventilation
Cooling modulation
= 2°C
Cooling
Cooling logic
Treg = regulation probe temperature (on supply air or room sensor on display)
Tsp = set point temperature
Te = external probe temperature
firmware 0.25
Electronic Control "HRD EC" User Manual

1 Control Features:

sensor
2

2 Control logic

Ventilation
By-pass
= 2°C
Cooling modulation
Tsp-Te
+ By-pass
By-pass
+
Cooling
Figura A
By-pass
+
Heating
Heating modulation
+ By-pass
By-pass
= 2°C
Ventilation
Rev.05
Tsp-Treg
Heating
Heating modulation
= 2°C
Ventilation
Heating logic
ENG
Tsp-Te
EN 4/ 23