Vaillant ecoTEC SERIES Instructions For Installation And Servicing

Also see for ecoTEC plus 612: Instructions for use Installation and maintenance instructions Instructions for use Installation and maintenance manual Instructions for installation and servicing

Contents

Vaillant ecoTEC SERIES Instructions For Installation And Servicing Manual pdf 31 page image

31Instructions for installation and servicing ecoTEC 839592_124.16 Thermostatic radiator valvesThe boiler has a built in automatic by-pass valve makingit ideal for use in systems with thermostatic radiatorvalves (no separate system by-pass is required). Foroptimum fuel economy where TRV’s are used they mustbe used in conjunction with a boiler control interlock. Aprogrammable room thermostat or separate timer androom thermostat will ensure complete boiler shut downwhen the heating demand is satisfied. (The radiator inthe room containing the room thermostat should not befitted with a TRV).4.17 Frost protectionThe boiler has an integral frost thermostat which isdesigned for protection of the boiler. To protect remoteor exposed parts of the heating system or propertyadditional frost protection measures must be taken suchas the installation of an external frost thermostat. Thisfrost thermostat should be connected across the boilerterminals 3 and 4, in parallel with any external heatingcontrols.NoteExternal frost protection cannot be used whenplug in timers are utilised.4.18 Circulating pumpThe boiler incorporates a built in circulating pump thatis fully prewired (no additional wiring is necessary). Thepump incorporates an automatic overrun period afterthe boiler switches off.4.19 Anticycling ‘economiser’ controlThe boiler incorporates a built in anticycling control toensure that energy wasteful short cycling of the boilercannot occur. This control prevents the boiler fromreigniting for a preset period after central heatingoperation (the hot water operation is unaffected by thiscontrol and hot water can be drawn at any time).NoteTo temporarily override the anticycling controlturn the main boiler on/off switch to the offposition “0” and then back to the on position“I” after a few seconds.4.20 Automatic pump spin control (APS)The boiler incorporates a built in control which will spinthe built in circulating pump and operate the divertervalve (ecoTEC combination boilers only) once in a23 hour period. This control helps to prevent seizurewhen the boiler is not operated for a period of time.This control is not active when the power supply to theappliance is turned off.Boiler installation sequence 4