Electronic controllers
Electronic fan coil controllers - quick reference table
Thermostats
Control algorithms
On-off
Proportional-integral
Valve management
Air flow control only (no valve)
On-off actuators
Proportional valves
Fan control
Three speeds
Optimum fan speed selection
Variable speed
Main functions
Setpoint control
Occupied/unoccupied mode
Frost protection mode
Window contact input
Measurement of water inlet temperature for automatic seasonal changeover (2 pipes)
Automatic seasonal changeover (4 pipes and 2 pipes + electric heater)
Manual changeover
Frost protection mode
Continuous ventilation within dead-band
Periodical ventilation within dead-band
On-site configuration
Unit grouping
Louvre control
Supply air temperature monitoring limiting
Communication (CCN)
Electrical heater loadshed
Dirty filter alarm
Alarm reporting
IAQ control
Demand control ventilation (DCV)
Free cooling mode
User interface
Digital display
Automatic or manual fan speed control
Operating mode selection
Occupancy (eco) button
HDB
x
NTC
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x types A + C
x types D + B
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
o
o
o
x
x
x
x
x
x
x
x
x
x
x
157
x
o