Double Action Operation (Heating-Cooling) - CD Automation REVO RT User Manual

REVO RT
from 35A to 90A

9.6 Double Action operation (heating-cooling)

REVO RT is suitable for systems requiring heating only or a combined heating-cooling action.
The Heating/Cooling action is obtained through the following steps:
1 configuring the main control as Heating with the parameter "Action Type (Tipo Azione)" = "Heating" on
parameters:
• P47 Add 2047 = Heating (Value "0") for Loop 1
• P61 Add 2061 = Heating (Value "0") for Loop 2
• P75 Add 2075 = Heating (Value "0") for Loop 3
2 connecting at least one of the 5 Relay Digital Outputs (DO1, DO2,...DO5), to cooling funtion by the
following parameters:
• P219 Add 2219
• P221 Add 2021
• P223 Add 2223
• P225 Add 2025
• P227 Add 2027
3 raising the configuration bits on each output
• Bit 0 = Cooling Loop 1
• Bit 1 = Cooling Loop 2
• Bit 2 = Cooling Loop 3
PID regulation works in this way:
Parameter "Proportional band (Banda Proporzionale)"
Parameter "Integral Time (Tempo Integrale)"
Parameter "Derivative Time (Tempo Derivativo)"
Parameter "Heating time Cycle (Tempo Ciclo Riscaldamento)"
Parameter "Cooling PB Multiplier (Moltiplicatore PB Freddo)"
Consequently the Cooling Proportional band is determined by:
"Proportional band" x "Cooling PB Multiplier", while Integral Time and Derivative Time they are the same
for both actions.
The two bands can overlap or space each other with the parameter "Dead Band (Banda Morta)": see
Parameters P97, P123, P149 in Chapter 11 "Parameter List".
For systems where the heating and the cooling output must never be active at the same time, the "dead
band" parameter will be configured with a value <0, vice versa if an overlap of the 2 bands is required, the
"Dead Band" parameter will be configured with a value >0.
Heating Proportional band
Integral time of heating and cooling
Derivative time of heating and cooling
Heating Time Cycle
Cooling Proportional band
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