12 Gabarrón CM&CMX6.4 SANITARY HOT WATER (S.H.W.)The CMX15 and CMX18 boilers have a mixed function of modulated heating and the preparation of sanitary hotwater. The S.H.W. function has priority over the heating and so the outputs are never added together.A 50-litre header tank lagged with CFC free insulation accumulates the sanitary hot water.6.4.1 AJUSTING THE S.H.W. TEMPERATURETo switch on the S.H.W. push the button. This function can be switched off by pushing the same button (thedisplay will only show a small red dot).When the S.H.W. is switched on, the display will show the actual temperature in the S.H.W. accumulation tank.The setting of the S.H.W. temperature can be modified by pushing both the button or the button andadjusting the setting that flasheds on the display. The modfied setting will be stored automatically afer a fewseconds, or instantly if we push the button.The S.H.W. setting can be varied between 20 and 55°C.6.4.2 SANITARY HOT WATER SAFETYOVERHEATING OF THE S.H.W.If the error E7 appears on the display, the boiler has detected the overheating in the sanitary hot water tank.Once the cause of the overheating has been eliminated, the thermal limiter of the S.H.W. must be re-armed.To do so, unscrew the black cap and push the small pin behind it until you hear a click.The limiter will not re-arm until the temperature in the S.H.W. header tank has gone down to below 80°C.S.H.W. SAFETY VALVEA safety valve set at 7 kg/cm2 will activate if the pressure in the S.H.W. accumulator tank exceeds said value,expelling water. It is essential that this valve runs to a drain.S.H.W. RETENTION VALVEThis prevents the S.H.W. accumulator tank from emptying even when the water supply to the dwelling is cut off.