Hitachi YUTAKI Series - Mono-Energetic Systems (CONF 2)

Controller pack
Service Manual
78
Systemconguration,settingsandcontrolsystem
SMGB0066 rev.0 - 12/2009
 
Mono-Valent System with DHW.
Hydraulic separator or buffer tank.
Secondary pump for heating system.
DHW controlled by separate pump.
Auxiliary DHW electric heater.
CONF=1 Mono-valent system
P1=2 DHW pump
P2=1 Secondary pump
 

Inmono-energeticsystems,theheatpumpissupplementedbya3-stageelectricheatertoprovideadditionalheating
energy to the system. The Heat Pump is sized to provide around 60% of the heating requirements on the coldest
dayoftheyear,andwilltypicallyprovide90-95%oftheheatingrequirementsoverthewholeheatingseason.An
electric auxiliary heater is used to provide the additional heating required on cold days. Used in new builds or in boiler-
replacement applications.

CONF = 2
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.
P33 = 5K (electric heater return high limit offset)
The Electric Heater Return High Limit is an important check to help ensure that the heat pump operates as much as
possibleevenwhenhighersupplytemperaturesarerequired,thusemphasisingenergyeconomyoperation.Toenable
this feature parameter P33 (return temperature limit offset) should be set to a value of 5K. Refer to the section on Electric
Heater Control for more information.
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-Energetic System with DHW.
DHW controlled by diverting valve
Auxiliary DHW electric heater.
CONF=2 Mono-energetic system
P1=1 DHW valve
P2=0 no secondary pump