General
The TF428WNM/U communicating thermostat is designed for 3-speed fan and valve control in a fan coil system, including:
2-pipe cool only/heat only/manual changeover
4-pipe cool /heat manual / automatic changeover
Ventilation mode
Manual or automatic 3-speed fan control
Water valve on/off control
The TF428WNM/U is available in Modbus RTU protocol and can be easily integrated into building automation system.
Keypad lock options
Specifications
Physical Layer EIA485
Protocol Modbus RTU
Baud rate 4800/9600(Default)/19200
Parity None
Error Checking Mechanism CRC
Rated Power & Frequency 220/230VAC, 50/60Hz
Power consumption <2W
Control PI, On/off output
Accuracy ±1°C at 21°C
Auto Cycle times 100,000 times
Manual Cycle times 10,000 times
Protection class IP20
Set point range 10 ~ 32°C
Display range 0 ~ 37°C
Ambient operating limits 0~ +49°C
Ambient storage limits -30 ~ +60°C
Humidity limits 5~90% RH, non-condensing
Action Type: 1
Pollution Degree 2
Protection against electric shock class Class II
Electronic control software class Class A
Rated Impulse Voltage: 2500V
Maximum Temperature for 155°C
Relay wiring
Wire Sectional area
(Recommendation) 1.0~1.5mm2
Applied altitude up to 2000m above sea level
Rating Capacity
Working current for the whole product : 4(3)A
4A: When the load of the thermostat is resistance
3A: When the load of the thermostat is inductance
For Fan load 3(2)A
3A:when the load is resistance; 2A:When the load is inductance
For Valve load 2(1)A
2A: when the load is resistance;1A: when the load is inductance
The valve need have overtravel-limit organ to turn off the
load.
