Hitachi YUTAKI Series - Engineering Parameters

Controller pack
Service Manual
106
Parameter tables
SMGB0066 rev.0 - 12/2009
       
P27
Maximum allowed
DHW loading time
(not available if P1=0)
123-5
Sets the maximum time allowed for DHW
loading.Afterthistime,iftheDHWsetpointisnot
achieved,thecontrollerwillneverthelessreturnto
heating.
1 12 0.5 1.5 hr
P30 No-load function enable 12345
Disables the heating in Zone 1 if the OTC
calculated supply setpoint falls below the room
temperature
0 1 1 1
P31
Heat Pump Sensor
Offset
12345
Compensates for differences in temperature
measurement between the Heat Pump and the
Supply Sensor.
0 5 1 3°C
P32
Supply-Return
Difference Control Limit
-2345
Control parameter to help maximise running time
of the heat pump and minimise use of the electric
heater or boiler.
1,then
OFF
10 1 3°C
P33
Return Temperature
Limit Offset
-2345
Control parameter to prevent electric heater use
when the return temperature is too high for heat
pump operation.
1,then
OFF
15 1 OFF
P34
DHW Electric Heater
Waiting Time (not
available if P1=0)
12---
Sets the time to wait after starting to heat the
DHW tank before enabling the special output for
“DHW electric heater enable”
0 60 1 45min
P35
Mixing Valve Opening
Delay Time
---45
Forsolidfueloroilredboilers.Preventsthe
mixing valve opening for the set delay time to
allow the boiler to heat up (minutes).
1,then
OFF
20 1 OFF
EP37
DHW offset for Heat
Pump maximum supply
temperature.
12345
The maximum DHW temperature able to be
supplied by the heat pump is the Heat Pump
maximum supply temperature minus this EP37
value
0 20 1 7 K

 

EngineeringParameters(EP)areprovidedforserviceengineersorthemanufacturertomakeadjustmentsthatmaybe
requiredtoxdifcultorunusualproblems.Theyareaccessedinasimilarwaytotheinstallerparametersviathefront
panel keypad.

ToenterEngineeringParameterDisplaymodefromtheNormalOperationmode,pressthe

,

and buttons
togetherforatleastonesecond.Thedisplaywillshow“EP1”(or“EP2”or“EP5”dependingonthesystemconguration)
toindicatethattheSystemControllerisinEngineeringParameterDisplaymode,andshowstheparameterabbreviation
and its current setting.
Use the 1.
+
and
-
buttons to move up or down the parameter list according to the table.
Tochangeaparametersetting,usethe2.

button to enter Parameter Setting Mode. The value of the parameter will
ashtoshowthatitcannowbechanged.Usethe
+
and
-
buttons to change the value to the desired setting.
Tostoretheparametersetting,pressthe3.

button.Theashingwillstoptoshowthevaluehasbeensaved.Instead,
tocancelthechange,andretainthepreviouslystoredvalue,pressthe

button.
Continuetochangetheparametersasrequired.Whennished,oratanytime,pressingthe4.
button will return the
display to Normal Operation mode.