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VTS Ventus VVS300 [25/47] Antifreeze management
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uPC3 – rel 1.8 – 11/2021
25
change to satisfy in the best way the request by
thermoregulation.
Here below an example with devices with the same
power:
Min inverter power: 20%
Max heaters power: 33.3kW
In this case the second heater will start when the
request reach the threshold calculated in the
following way:
Before to start the ON-OFF device, the request
must be greater than 20% of the power of the
second device.
Here below the graph:
It’s possible to set different power of the heaters,
so the ON sequence will be different to follow the
request from PID loop.
Direct expansion (DX)
Below the description of how the direct expansions
circuit works in the application. DX could be
present according application code in main cool,
main heat, reverse, preheat and reheat sides.
The PID sequence calculate a request 0-100% that
is executed by ON-OFF devices and by a
modulating device.
Each ON-OFF device has a threshold to start the
device and a threshold to stop the device.
The modulating element will follow the request from
PID sequence.
Between the stages activation there is a timinings
control, listed below:
1. Minimum On time
2. Minimum Off time
3. Time between same device.
Steam
Below the description of how the steam device
works in the application. Steam device could be
present in the main heater only.
The PID sequence calculate a request 0-100% that
is directly executed by the steam actuator.
Here below the regulation of device:
Steam device doesn’t need antifreeze and frost
protection.
6.8 Antifreeze management
Antifreeze management is divided in different
stages.
Startup: described in start/stop sequence
paragraph.
Running: see preheater regulation.
Low temperature by thermostat: in case of low
temperature by thermostat the fans are stopped,
the damper are closed and the heating devices are
forced to 100%.
Low back water condition: if the back water temp.
is too low the unit behave in the same way of low
temperature by thermostat.
If the back water temp. is lower, according to
another threshold, the back water temperature set
is compensated with a delta according to the
external temperature.
PreHe: Preheater
The device will modulate accoding to its PID
settings to keep the setpoint based on after
preheater coil temperature.
Main goal of this device is prepare air for recovery
and to avoid antifreeze condition for heat recovery
device. In case of hot water coil, the request from
the PID on after coil temperature is used to
calculate the setpoint of the water, then another
PID calculate the opening of the valve.
0%
100%
Modulation signal
ON/OFF steps
Min
0%
100%
Start 1
Start 2
Stop 2
Stop 1
0%
100%
Min
Valve
Pump
B.Water.temp.
Thermostat
Thr. Low b.water.
Low freeze set
High freeze set
Alarm
Back water compensation
Содержание
- Software for air handling units 1 19 1
- Ventilation vts 1
- Introduction 4
- Main features 4
- Field connections 5
- Start up 6
- I o configuration 8
- Installation 8
- All sensor temperature with additional b6 after recovery on supply 10
- Cav regulation for fan 10
- Compact suspended floor rrg unit with built in compact suspended floor rrg unit with built in automation standard equipped with an 10
- Expansion module i o 10
- Expansion module i o mainboard control circuit 10
- Humidity return sensor 10
- Standard elements for all units 10
- Standard input output for function 10
- Supply 24v 10
- Ventus cbx controlbox automation standard ventus cbx controlbox automation standard equipped with an expansion module i o pcb ec 10
- Adjustable switching level individual sections 11
- Adjustable switching level of individual sections 11
- Dx cooler c_dx control pid controller cooling 11
- Electric heater he control pid controller heating 11
- Fan v control standard work percentage control 11
- Filters f control compact pressure transducer 11
- Limiting the minimum maximum signal 11
- Limiting the minimum signal 11
- Low air temperature alarm 11
- Pid control for regulation cav 11
- Pid control for regulation vav 11
- Pid controller cooling recovery 11
- Pid controller protecting the rebate sensor 11
- Recovery plate cross hex p control pid controller heat recovery 11
- Ventus pressure switch 11
- Water cooler c_cw control pid controller cooling 11
- Water heater h_cw control pid controller heating 11
- Adjustable switching level of individual sections 12
- Dxh reverse c_dxh control pid controller heating 12
- Humidifier w control pid controller humidity 12
- Limiting the minimum maximum signal 12
- Limiting the minimum signal 12
- Mixing chamber m control pid controller heating 12
- Pid co2 controller 12
- Pid controller compensation for supply air humidity 12
- Pid controller cooling 12
- Pid controller cooling recovery 12
- Recovery glycol g control pid controller heat recovery 12
- Recovery rotary r control pid controller heat recovery 12
- Redundant fan the fan section contains doubled fans motors and inverters one fan is working the other is a reserve in the event of a failure in addition the operating hours counters decide on routine switching between the fans so that the load and wear of both units is uniform when switching from one fan to another there is a gap to adjust the position of the dampers directing the air flow 12
- Addtitonal temp sensor 13
- Preheater control pid controller heating 13
- Reheater control pid controller heating 13
- Application code 14
- Modbus devices 14
- Unit configuration 14
- Additional settings for the control circuit module on the screens 16
- Command type data type addr 16
- Hmi advanced menu other j03 hmi advanced menu other j03 the menu from which we activate individual extension modules 16
- Holdingregister int 0 16
- Holdingregister int 1 16
- Holdingregister int 2 16
- Holdingregister int 3 16
- I r input register h r holding register 16
- Important information when using an external humidity transducer turn off the measurement on the control circuit board hmi advanced menu other j03 j04 co2 sensor 16
- Important information when using an external pressure transducer turn off the measurement on the control circuit board hmi advanced menu other j03 j04 humidity sensor 16
- Inputregister int 0 16
- Inputregister int 1 16
- Inputregister int 2 16
- Inputregister int 3 16
- Module i o 16
- Pressure sensor pressure sensor 16
- Vts mainboard control circuit 16
- Vts pcb ec 17
- Display hmi advanced 18
- User interface 18
- User menu 18
- Ability to edit some of them for more information on the parameters that can be changed see the parameters table default password 0001 20
- Access the main menu 20
- Advanced user maintenance read only access 20
- Attention there are two options for the calendar program details in the chapters on the calendar and service menu 20
- Attention to change the temperature setpoints attention to change the temperature setpoints simply turn the knob 20
- Clock button entering the auto mode the driver will work according to the schedule from the calendar settings 20
- Default password 0002 20
- Display hmi basic 20
- Fan button setting the fan speed 20
- First letter second letter n 20
- Hmi basic also has a built in clock with support for time schedules 20
- If a given day is not defined as special but is in a special period then the mode for the special period is implemented 20
- If both of these do not occur the basic schedule is implemented 20
- Implementation of the schedule considering the priorities of time schedule settings the order of their implementation is as follows the first special day settings are those with the highest priority the other settings are then ignored 20
- In the parameters screen the access needed to edit in the parameters screen the access needed to edit the parameters is shown always with the same codes an example follows 20
- Lcd display indicates the actual temperature in the room or on the main control sensor and the selected setpoint operating mode fan speed time and day of the week 20
- Manufacturer read write access to all parameters 20
- Menu description 20
- On off button switch between on off status forces the control panel to stop or enables selection of the operating mode 20
- Once the password is entered it will be maintained for 5 minutes from the last time a key was pressed and then the password will need to be re entered in order to access the parameters of the advanced functions in the log out menu the password can be force entered without waiting 5 minutes 20
- Password management 20
- Regardless of the displayed screen pressing the programming key accesses the password entry screen which allows access to the main menu shown below the code of the mask is determined by the menu tree 20
- Rotary button change of settings by turning accepting new values by pressing 20
- Service read access to all parameters with the 20
- The basic interface with built in temperature sensor the basic interface with built in temperature sensor 20
- The program has 3 different password levels the program has 3 different password levels 20
- To all parameters default password 0000 20
- User setpoint 21
- Cooling heating changeover 22
- Functions 22
- On request 22
- Start stop sequence 22
- Fresh air regulation 23
- Temperature regulation strategy 23
- Devices activation 24
- Humidity regulation 24
- Antifreeze management 25
- Fans control 26
- Minor functions 27
- Mixing chamber control 27
- Regulation 27
- Supervisor 29
- Alarms 30
- Alarms interface 30
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