Hitachi YUTAKI Series - Room Temperature Compensation; Heating Circuit Minimum;Maximum Temperature Limits

Controller pack
Service Manual
84
Heating control functions
SMGB0066 rev.0 - 12/2009
 

Ifroomcompensationisenabled,thecalculatedOTCsupplysetpointisadjustedbasedonthedifferencebetweenroom
temperatureandroomsetpointinordertoreducetheroomerror.Theamountofroominuencecanbeadjustedbythe
room temperature compensation factor setting.

P7 Room Compensation Factor (default value 2)
Toincreaseordecreasetheamountofroomcompensation,adjusttheroomcompensationfactor.Ahighervaluewillgive
moreprioritytotheroomtemperatureerror,andalowervaluewillmeanthecontrollerfollowsmorecloselytheselected
heating curve.

P7=2,
SR1(roomsetpoint)=20,
TR1 (room temperature) = 23
=>S1(supplysetpoint)reducedby2*(23–20)=6K

Todisableroomcompensationcompletely,setP7=0.Itisalsorecommendedtochangethesetting8:Su=1ontheroom
unit. This will prevent the room temperature being transmitted to the System Controller and the room temperature will
not be displayed to the end-user on the Room Unit. Please refer to the System MMI Pack Installation and Operation
Manual for further details.

note
Room compensation should not be used when the room unit is located in a position unrepresentative of the -
desired temperature in the living spaces, for example in a warm cupboard
The room setpoint and room temperature values are sent from the Room Unit to the System Controller by a -
wireless signal. There can be a short delay in response between a room setpoint or temperature change and
the system controller changing the supply setpoint.
 

The calculated supply water temperature setpoint is limited between the minimum supply temperature and the maximum
supply temperature settings. The maximum temperature limit can be used for example to prevent high temperatures
goingtooorheatingsystems.Theminimumtemperaturelimitcanbeusedwhenitisdesiredtokeepaminimumlevelof
heating in the heating circuit.

P5 Minimum Supply Temperature (default 15°C)
P6 Maximum Supply Temperature (default 55°C)

CONF 1: P6 can be set up to a maximum value of 55°C
CONF 2: P6 can be set up to a maximum value of 65°C
CONF3,4,5:P6canbesetuptoamaximumvalueof90°C