Riello NXHP Series Installation, Operation And Maintenance Instructions page 54

4 -OPERATION
3/ Custom climatic curve
COOLING: If the cooling climatic curve [P586] is configured
to "0", the water setpoint will be calculated according to the
custom cooling climatic curve.
This custom cooling climatic curve can be defined using the
following parameters:
Parameter Description
P587 Custom Minimum OAT
P588 Custom Maximum OAT
P589 Custom Minimum Water Temp
P590 Custom Maximum Water Temp
Example:
Custom Cooling Climatic Curve
■ If OAT is invalid, the Water Setpoint is equal to the Custom
Minimum Water Temp [P589].
■ If OAT is above the current Maximum OAT threshold, the Water
Setpoint is equal to the Custom Maximum Water Temp [P590].
■ If Minimum OAT is greater or equal to Maximum OAT threshold,
the Water Setpoint is equal to the Custom Maximum Water
Temp [P590].
HEATING: If the heating climatic curve [P581] is configured
to "0", the water setpoint will be calculated according to the
custom heating climatic curve.
This custom heating climatic curve can be defined using the
following parameters:
Parameter Description
P582 Custom Minimum OAT
P583 Custom Maximum OAT
P584
Custom Minimum Water Temp
P585
Custom Maximum Water Temp
54
Default Min.
20°C 0°C
35°C 24°C
10°C 5°C
18°C 5°C
Default
min
max
OAT (°C)
Default Min.
-7°C -30°C 10°C
20°C 10°C
20°C 20°C
38°C 30°C
Example:
Custom Heating Climatic Curve
75
65
55
45
P585
35
Max.
25
P584
30°C
15
50°C
5
-30
20°C
20°C
■ If OAT is invalid, the Water Setpoint is equal to the Custom
Max. Water Temp [P585].
■ If OAT is above the current Maximum OAT threshold, the Water
Setpoint is equal to the Custom Min. Water Temp [P584].
■ If Min. OAT is greater or equal to Max. OAT threshold, the Water
Setpoint is equal to the Custom Max. Water Temp [P584].
4/ Offset on climatic curves (predefined and customer)
Two other parameters are also configurable to adjust water
setpoint to suit customer needs:
■ For cooling curve, Cool Minimum Water Setpoint [P589]can be
offsetted by an offset on foot of the curve (Cool Curve Min Stp
Offset [P410])
■ And for heating curve, Heat Maximum Water Setpoint [P585]
can be offsetted by an offset on head of the curve (Heat Curv
Max Stp Offset [P409])
Custom Cooling Climatic Curve :
Offset on foot of the curve
Max.
30°C
40°C
Heating Cooling Climatic Curve :
75°C
Offset on head of the curve
-20 -10 0 10
P582
P583
OAT (°C)
P410
OAT (°C)
P409
OAT (°C)
Default
min
max
20 30