Hitachi YUTAKI Series - Page 124

Controller pack
Service Manual
122
Systemcongurations
SMGB0066 rev.0 - 12/2009
¡
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
- Direct loop when heat pump operating on it´s own mixing circuit when boiler operating
• Sequencecontrolofboilerandheatpump
• OptionalDHWstoragewithdivertingvalveorpump
 
• SetinstallerparameterCONFtovalue5
• 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
•
Mixing valve 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
- Heat Pump
- Boiler
- Secondary pump
- Bypass/ Mixing valve
- Optional DHW pump/ valve
  
Mixed supply
sensor
Return sensor
Supply sensor
Outdoor sensor
Heat pump
control output
Heat pump fault
Tariff/ Timer input
DHW Sensor
RF Receiver
-
+
T MIX
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
Boiler on/off Secondary pump Heat pump remote on/off
ON/ OFF
Mixing valve close Mixing valve open
12
11
10
9
8
7
6
5
4
3
2
1
DHW Valve/Pump
N
N
L
15
14
13