[. . . ] The cooling/heating floor kit includes : ­ 1 ambient box with ambient temperature adjustment (+/- 3° C) thumbwheel. [. . . ] In heating mode, the setting on water return takes into account the desired P08 ambient temperature (description of parameters in the regulation brochure MRS 5. 1B " commissioning "), the position of the ambient box thumbwheel and the outside temperature. In cooling mode, the unit starts as soon as the ambient temperature goes above P09. If the temperature control is dependent on the outdoor temperature (P03=1), remember to set the control slope (water rule) using parameters P27, P28, P29 and P35. Regulation as a function of the outside temperature : P03 = 1 Adjustment of the water law : P36 = 20° C and P27 = 20° C P28 = Min. Basic outside temperature of the area P29 = water return temperature used in the calculation of the house thermal losses at the min. [. . . ] Basic outside temperature of the area P29 = water return temperature used in the calculation of the house thermal losses at the min. [. . . ]