Sequential control of cooling and heating
This parallel/sequential control functionality allows for multiple chiller/heat pumps to be combined and operate interdependent. This allows for an efficient operation based on building demands.
Main functionality
This functionality is called Multilogic and it can control up to 32 chillers/heat pumps in a parallel and/or sequential hydronic circuit. They operate together in three different modes to match demand:
Balanced – parallel operation, same priority.
Sequential – a prioritised unit operates to 100%, a second units starts thereafter.
Optimised – a mix of balanced and saturated modes are utilised to focus on energy efficiency. Both units’ and pumps’ energy consumption is considered in this operational mode.
A further option is booster/backup where one unit is used only for backup and peak cooling demands, may be a less advanced unit to keep investments at a minimum.
Added value
- Delivers the needed capacity at the right time
- Reduces energy consumption
- Manages plant redundancy and prioritisation
- Offers smart defrost sequencing when heat pumps are used
- Manages various product combinations
- Easy connection via LAN
- No need for additional external controls
- Pre-defined from the factory
Description
- A master unit calculates the thermodynamic demand by considering the average inlet/outlet temperatures.
- The outlet temperature is compared to setpoint and the calculated capacity demand is communicated to the cooling/heating units. This determines the on/off operation of the available compressors. Compressor modulation in the case of inverter units.
- The selected operational mode (balanced, sequential, optimised) determines circuit/compressor operation per unit.
- Multilogic controls unit pumps.
- One or more units can be utilised as backup or booster.
- Each unit may be assigned an operation priority.
Technical details
- The master unit is the centre of the system, managing the thermoregulation and gathering unit alarms.
- Modbus TCP/IP through Ethernet cable is used for the communication between master and other units. The master hosts a switch to where all other units are connected.
- If a unit is offline, the master redirects capacity demand to other available units.
- If the master is offline, other units turn to a stand-alone operational mode. Internal temperature sensors are used to remain in operation.
Products
Here is a selection of the products included
