Hitachi YUTAKI Series - Mono-Valent Systems (CONF 1)

77
Systemconguration,settingsandcontrolsystem
SMGB0066 rev.0 - 12/2009
Controller pack
Service Manual
4
CONF 4 Bi-Valent Series System -
Theboilerisusedtotop-uptheenergyrequiredforthesystem,butwhentheheatpumpisoutsideit’soperatinglimits,
the boiler will provide all of the heating requirements.
Heat Pump Capacity (kW)

Heat Pump
Only
Heat Demand (kW)
Boiler
Heat Pump
Boiler
Only
   
Heat Pump
operates alone
Boiler and Heat
Pump operate
together when
needed
Boiler operates
alone
default
value 0C
default
value -20C
CONF3,5Bi-ValentParallelSystems -
Thenormaloperationinthesesystemsisthatwhentheheatpumpcannotmeettheheatingload,theboilerwilltakeover
the full energy requirements of the system (alternative operation).
Alternative Operation can be achieved by setting P14=P15. This means that either the heat pump or the boiler operate
but not the two together (exception is during DHW demand).
ImportantNote:P14shouldneverbesethigherthanP15,otherwiseincorrectoperationwillresult.
 

Inmono-valentsystems,theheatpumpisthesoleproviderofheatingenergytothesystem.TheHeatPumpissizedto
provide 100% of the heating requirements on the coldest day of the year. It is recommended for low-energy houses and
for moderate climates without severe winters. Used in new builds or in boiler-replacement applications.
Thiscongurationissuitableforlow-temperatureradiatorsandunderoorheatingsystems.

CONF = 1
P1=0,1,2accordingtoDHWsystemtype.
P2=0,1accordingtowhetherabuffertank/hydraulicseparatorandsecondarypumpisinstalled.
P4 = heating curve according to building and system characteristics.
Itisalsorecommendedtoreviewallparametersettings,andmakemodicationsasrequiredbytheinstallation.
InordertoachievehigherDHWtemperatures,thesystemcanoperatewithanauxiliaryDHWelectricheater.
 
Mono-Valent System with DHW.
DHW controlled by diverting valve
Auxiliary DHW electric heater.
CONF=1 Mono-valent system
P1=1 DHW valve
P2=0 no secondary pump