Product category:
Pressure/temperature regulators, steam traps
News Release from: Slaney Direct | Subject: SRC-DO HA
Edited by the Processingtalk Editorial
Team on 10 May 2005
Remote wireless temperature sensor as a
thermostat
A new wireless thermostat receiver from Thermokon compares the room temperature sent by a remote wire-less sensor to the setpoint, and provides a heating control relay function
The new wireless thermostat receiver from Thermokon compares the room temperature sent by a sensor to the setpoint on the sensor If it is above or below this setpoint, a relay is switched on or off
This article was originally published on Processingtalk on 9 Nov 2004 at 8.00am (UK)
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The floating relay output can be used for direct control of thermal two-point valves.
It is also possible to 'teach in' window contacts of the type SRW01 to use the so called 'energy stop' function, i.e when a window is open, the receiver will de-energise the relay contact for the valves.
The thermostat receiver compares the measured room temperature to the calculated setpoint.
If the room temperature is less than the setpoint, a relay is energised and the LED illuminates.
If the room temperature exceeds the setpoint, the relay is de-energised and the LED extinguishes.
The receiver calculates the room temperature setpoint from the basic setpoint (default 20C) and the setpoint offset (default -5 to +5 K) set on the wireless sensor.
This wireless sensor sends a message with the measured values to the receiver about every 1.6 minutes (if the room temperature changes more than 0.8 K since the last message) or at the longest about every 16 minutes.
In normal mode brief illumination of a second LED on the receiver indicates reception from a 'teached-in' sensor.
Using 'teached-in' window contacts, the thermostat receiver can only energise the relay if a) the window contact signals "Window closed", b) there has been no signal from the window contact in the last 45 minutes (defective window contact), c) the window contact signals "Window open" but the room temperature drops below 8C (frost protection).
Monitoring of communication between the receiver and sensor works as follows.
If the receiver has received no valid message from the room sensor for 90 minutes, it energises and de-energises (defective sensor signal) the relay output in a 10 minute cycle.
The fault is indicated on the receiver by rapid flashing of an LED.
As soon as a valid message is received again from the failed sensor, the receiver continues to operate in its normal regulating function.
A fault message is cleared manually by changing into teach mode.
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