Hitachi YUTAKI Series - Page 121

119
Systemcongurations
SMGB0066 rev.0 - 12/2009
Controller pack
Service Manual
4
 
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. Please take care about
thetypeofDHWstoragetankttedandthepositionoftheelectricheater.
  
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
DHW Valve/Pump Secondary pump Heat pump remote on/off
ON/ OFF
12
11
10
9
8
7
6
5
4
3
2
1
N
N
L
15
14
13
¡
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 (additional capacity and/or higher temperature). Used in new builds or in boiler-
replacement applications.
• DirectOTCControlledHeatingLoop
• OptionalDHWstoragewithdivertingvalveorpump
• 3-stageelectricheater
 
• SetinstallerparameterCONFtovalue2
• SetinstallerparameterP1to0(noDHW),1(DHWvalve)or2(DHWpump)
• SetP4(OTCheatingcurve)accordingtobuilding/system
• SetP33(returntemperaturelimitoffset)tovalue5K
 
•
SetinstallerparameterP2to0(nosecondarypump),1
(secondarypump),ifbuffertankorhydraulicseparatoris
used
•
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
- Heat Pump
- 3-stage electric heater
- Optional DHW valve/ pump
- Optional secondary pump
- Optional DHW electric heater