ACV HeatMaster 25 TC Installation, Operating And Servicing Instructions

Also see for HeatMaster 25 TC: Installation, operation and maintenance instructions Installer's handbook Installation operation & maintenance Installation, operation and maintenance instructions

ACV HeatMaster 25 TC Installation, Operating And Servicing Instructions Manual pdf 22 page image

STANDBY MODEWhen the boiler is switched on, it starts up in Stand-by mode, as shownin the figure above.This is the standard mode of the MCBA. The MCBA automatically returnsto this mode after 20 minutes if no key is pressed on the display. Whenone or more parameters were stored, the new parameters will becomeactive.The first digit indicates the boiler’s current status, depending on thesituation of the boiler and the burner. The last two digits indicate theboiler temperature.Status Boiler functionStandby, no heat demandFan pre-purge/post-purgeIgnitionOperation of the burner for heatingOperation of the burner for domestic hot waterWaiting for signal from the air pressure switch or toobtain number of start revolutions.The burner is off because the set value has beenreached. There is still a demand for heat.Circulator time delay after the heating demand.Circulator time delay after the hot water demand.Blocked burner:Please refer to paragraph "MCBA blockage anderror codes" on pages 28 and 29If the burner is blocked for one of the above reasons, the screen displayalternates between "9" and the temperature (last two digits) and “b”with the error code.Once the cause of the blocking has been resolved, the burnerstarts up automatically after a maximum of 150 seconds.Status Boiler functionInternal adjustment — Three-way valveBurner on for holding boiler warmTest function: max RPM in CH modeTest function: min RPM in CH modeTest function: burner on with fixed fan speedMCBA PARAMETERS FOR THE SPECIALISTPARAMETER MODESETTING THE MCBA PARAMETERSTo access Parameter mode when the system is in Standby mode, pressthe “MODE” key once.To scroll through the list of parameters press “STEP”. To modify thevalue of the parameter, use the “+” or "–" keys.Next, press “STORE” to save the modified value. The screen will flashonce to confirm the data has been saved.To activate the modified parameters, press “MODE” again (this willswitch you to Info mode). However, if you do not press any key, thesystem returns to Standby mode after 20 minutes and activates thechanges.Factory settingDisplayDescription of theparametersHM 25 TCHM 35 TCHM 70 TCHM 85 TCSTEPSetting the hot watertemperatureSTEPHot water (DHW)production00 = Off01 = OnSTEPSwitching heating On/Off00 = Off01 = OnSTEPMaximum temperaturein central heating (CH)modeDisplayMODEEN • 22664Y5300 • AENFRRU PL DE IT ES NL