I have a Wirsbo Uponor CoSy wireless controller for the underfloor heating. This is the four channel model which apparently cannot be fitted with the Timer module available for the 8 channel version and required for automatic setback. The wireless thermostats have manual setback and timer options, but no internal timer option, and are presumably controller specific. Can anybody tell me if there is a work round this problem? Presumably a separate timer would do the job but would require its own thermostat to read the setback temperature?