Parameters P40, P41, P47, P48, P49, P50, P51, P52, P62, P67.
● PID setting
The Proportional Integral Derivative control parameters are set in the factory.
The values are:
- Hot Proportional Band: 4 K
- Hot Integration Time: 5 min
- Hot derivative time: 1 min
- Cold Proportional Band: 2 K
- Cold Integration Time: 10 min
- Cold derivative time: 1 min
These values, validated in the laboratory, enable “Comfort” operation in most terminal unit applications.
● Neutral zone ventilation
According to the operating mode, the neutral zone ventilation is set in the factory as follows:
- Comfort mode (P40): 0 Ventilation off (if controller with indoor environment sensor) or 3: periodic restarts (if control with
return sensor)
- Standby mode (P41): 0 Ventilation off
- Economy mode: 0 Ventilation off
- Frost protection mode: 0 Ventilation off
- Neutral zone ventilation is adjustable via P40 and P41, to comfort and standby mode
It is possible either to cut off the ventilation after 2 mins post-ventilation (parameter = 0), or have constant low speed ventilation
(parameter = 1), or have constant ventilation in the summer and cut off in the winter (parameter = 2), i.e. ventilation on every 30
mins for 30 seconds.
If control is applied using the return sensor, it is strongly recommended to have continuous low speed ventilation.
The setting of these parameters is derived from a compromise between control precision, physiological comfort and energy saving.
- When the V3000 is powered up, the deadband ventilation process will be effective as soon as the rst heating or cooling request
is made for a room.
● Minimum ventilation time
In automatic ventilation, the controller automatically engages the ventilation speeds. To limit the number of ventilation speed
changes, there is a stipulated minimum ventilation run time of 2 minutes at each speed.
● Comfort override delay
To control energy consumption, the controller may limit the operating time in comfort mode following a user override. This delay
is not applied when the order to enter comfort mode comes from the central management unit. Parameter P48 enables you to
set a timer between 30 mins and 24 h, or to prohibit any comfort override (P48 = 0). This function may be disabled (P48 = 24.5).
- If P48 = 24: the setpoint overrides are not stored upon return to standby mode. The current fan speed is not memorized and
returns to AUTO.
- If P48 = 24.5: the setpoint overrides are stored in all operating scenarios. The current fan speed is not memorized and returns
to AUTO.
● Operating mode activated by standby button
According to parameter P47, pressing the standby button switches between comfort and frost protection, or between comfort and
economy, or between comfort and standby.
In all cases, the central management unit maintains the option of selecting each of these operating modes.
● Electric heater operation limiting according to outdoor temperature
The controller can limit operation of the electric heater according to the outdoor temperature, once the comfort temperature has
been reached.
To do so, the base outdoor temperature must be defined (P62), the minimum temperature reachable at least 5 times in the course
of a normal winter.
The outdoor temperature information must come from the BMS via the KNX bus.
● Management of heat exchanger coils
Parameter P67 indicates to the controller whether it has at its disposal a hydraulic coil and electric heater, one of the hydraulic
coils only or an electric heater only.
Certain central management units modify this parameter to temporarily prohibit use of certain coils according to external events
(thermodynamic unit switched off, need to limit electrical energy consumption
…).
To get a better understanding of what is going on, diagnostic d13 recalls the value of P67 and d12 indicates the current status
following any action by the central management unit. Depending on what is defined in P67 and what the central management
unit requests (see d12), the regulator determines whether it can have hydraulic coils and electric heaters.
Diagnostic d11:
- If the controller is working based on its changeover sensor wired to S2 and C, d11 indicates the temperature read by this sensor.
- If the controller is working based on an On-off contact wired to S2 and C, or based on information from the centralised changeover
- d11 indicates 127°C if D2/C is shunted or centralised changeover = hot water.
- d11 indicates -72°C if D2/C is not shunted or centralised changeover = cold water.
Diagnostic d12:
Certain central management units may temporarily prohibit heating or air conditioning operation.
Diagnostic d12 will tell you the current authorisations.
Frost protection is enabled even if no heating authorisation has been activated by the supervision.
Very important: the sensor should be placed on the water inlet pipe. It must be installed on the pipe before being insulated
.
9 - CONTROL ALGORITHM
EN
EN - 11 EN7515935-00
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