Hitachi YUTAKI Series - Bi-Valent System - Parallel Operation - Mixing Loop (CONF 4); Bi-Valent System - Serial Operation (CONF 5)

Controller pack
Service Manual
80
Systemconguration,settingsandcontrolsystem
SMGB0066 rev.0 - 12/2009
 

Thisisabivalentsystemwheretheboilerisconguredinparallelwiththeheatpump.Ahydraulicseparatororbuffer
tankhastobeusedtoensureproperhydraulicbalancing.Thissystemisrecommendedforretrot(upgrade)applications
where an existing gas/oil boiler will be retained to provide the full heating requirements on the coldest days of the year.

CONF = 4
P4 = heating curve according to building and system characteristics.
DHW tank control is not possible with this system.
Itisalsorecommendedtoreviewallparametersettings,andmakemodicationsasrequiredbytheinstallation.
 
Bi-Valent System with DHW & mixed heating loop.
Hydraulic separator or buffer tank.
CONF=4 Bi-valent Parallel system
 

Thisisabivalentsystemwheretheboilerisconguredinserieswiththeheatpump.Ahydraulicseparatororbuffertank
hastobeusedtoensureproperhydraulicbalancing.Thissystemisalsousedforretrot(upgrade)applications,but
operateslikethemono-energeticsystemusingthegas/oilboiler,similarlytotheelectricheater,inserieswiththeheat-
pump. The boiler only needs to provide the additional peak load capacity

CONF = 5
P1=0,1,2accordingtoDHWsystemtype.
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.
 
Bi-Valent System with DHW.
Serial operation with bypass/mixing valve.
DHW controlled by diverting valve
Hydraulic separator or buffer tank.
CONF=5 Bi-valent Parallel system
P1=1 DHW valve