Fuji Electric FRENIC-HVAC User Manual page 25

● Linearization function
This function estimates the target pressure using the load flow rate, which allows the estimated
terminal pressure to be controlled. For an air-conditioning heat source system, the needed
quantity of the cooling or heating water fluctuates generally in seasons or days and nights.
Therefore, operations continuing in a water conveyance pressure constant control may lead to
high operating unnecessary pressures on terminals at low operating state. Thus, the pump
consumes an ineffectual electric power for maintaining the high water conveyance pressure.
↓
Based on the calculated value and water conveyance pressure of estimated terminal pressure
using the detected load flow rate, PID control is performed.
↓
It is possible to reduce the ineffectual pump power consumption and to achieve a great
energy-saving effect together with maintaining comfortable current air conditioning.
Refrigeration machine
Enhanced network support
 Standard equipment
∙ Modbus RTU
 Optional cards
∙ PROFIBUS-DP
∙ LONWORKS
∙ Metasys N2 ∙ BACnet
∙ CC-Link ∙ DeviceNet
∙ Ethernet
1-9
1.1 Features
∙ CANopen