Hitachi YUTAKI Series - Page 122

Controller pack
Service Manual
120
Systemcongurations
SMGB0066 rev.0 - 12/2009
 
The system controller can switch a DHW storage electric heater to achive higher DHW temperatures. The electric heater
should have its own thermostat set to a higher value than the DHW setpoint of the system controller.
  
Return sensor
Supply sensor
Outdoor sensor
Heat pump control
output
Heat pump fault
Tariff/ Timer input
DHW sensor
RF receiver
-
+
T RET
4-20mA
T SUP
T DHW
T EXT
12
11
10
9
8
7
6
5
4
3
2
1
15
14
13
DHW Heater enable Electric heater output 2 Electric heater output 1 DHW Valve/Pump Secondary Pump Heat pump remote on/off
ON/ OFF
2 1
12
11
10
9
8
7
6
5
4
3
2
1
N
N
L
15
14
13
¡
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
• DirectOTCControlledHeatingLoop
• Sequencecontrolofboilerandheatpump
• OptionalDHWstoragewithdivertingvalveorpump
 
• SetinstallerparameterCONFtovalue3
• SetinstallerparameterP1to0(noDHW),1(DHWvalve)or2(DHWpump)
• SetP4(OTCheatingcurve)accordingtobuilding/system
 
•
Boiler control parameters
•
DHW setpoint and control parameters
•
Minimum and maximum supply temperatures
•
Room temperature compensation
•
Frost Protection parameters
•
Summer switch-off setting
•
Tariff/Timerinputconguration
•
To select alternative operation (heat pump or boiler can
operateseparately,butnotatthesametime)
- Heat Pump
- Boiler
- Secondary pump
- Optional boiler primary pump
- Optional DHW valve/ pump