Hitachi YUTAKI RWM-2R1E Installation & Operation Manual page 227

UNIT CONTROLLER (PC-ARFH2E)
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Water calculation mode
Deactivated
Points
Set point at high ambient temperature
Set point at low ambient temperature
Low ambient temperature
Gradient
Vertex offset
Fix
Fixed temperature
213 PMML0575 rev.2 - 03/2022
The "Deactivated" option sets
the circuit as disabled.
Points is the most versatile calculation
type.
Set 4 points and one vertex point, to
create a line representing the function
that the air to water heat pump will use to
give the temperature setting according to
the current ambient temperature.
Use the down arrow key to select the
parameter to modify. Then modify the
value using the left and right arrow keys.
Vertex offset
High ambient temperature
Configure the same variables as in the "Points"
view, but automatically.
User can only edit the gradient variable and it
will automatically set the values for the other 4
variables on the chart.
Use the down arrow key to select the parameter
to modify. Then modify the value using the left
and right arrow keys.
Gradient curve
Set the circuit's temperature to a defined
value, forcing the unit to maintain it.