Hitachi RAS-H(V)RNME-AF Service Manual page 156

5 Control system
User variables:
CODE REF
6-000 hsb Hydraulic Separator = ( Disabled, Enabled)
C A U T I O N
• Be sure that the boiler and the integration of the boiler with the YUTAKI S system is in accordance with relevant
European and national regulations.
• HITACHI can not be held responsible for incorrect or unsafe situations in the boiler system.
• Make sure that return water to the YUTAKI S heat exchanger never exceeds more than 57ºC.
• Make sure that the non-return valves (field supplied) are correctly installed in the system as shown in the
illustration above.
• Boiler bivalent point
Unit should be sized to operate mainly in heat pump mode. Given that capacity is reduced with temperature, it may be
desirable for the unit to use boiler accessory only when ambient temperature is low.
Boiler will only be enabled when:
Outdoor Ambient Temperature > Bivalent outdoor temperature for boiler (6-007)
CAP (kW)
User Variable:
CODE REF
6-007 BB Bivalent outdoor temperature for Boiler
146
SMGB0070 rev. 1 - 08/2011
Description
Boiler
Boiler
-20 [
-20 [6-007]
6-007
Description
Default Value
Automately enabled when boiler complementary hea-
ting selected
Heat pump
Heat Pump
only
only
Ta
] 20 Text (ºC)
20
Default Value Range
-5 -20~20
Steps Units
1 ºC