Fujitsu WATERSTAGE 112 Maintenance Document page 19

Heat Pump, Split System, Single Service, 3 phase
70
60
50
40
30
20
20,0 15,0
The heating curves shown above refer to a 20°C
room temperature setpoint.
The heating curve slope (setting 720) determines the
impact of outdoor temperature variations on heating
flow temperature variations. The steeper the slope,
the higher will be the increase in the heating circuit
water flow temperature which occurs when the
outdoor temperature increases slightly.
Feeling of discomfort
By mild weather
Too cold
Too cold
Too cold
OK
OK
OK
Too warm
Too warm
Too warm
Maintenance Document 1394-1
Heating Curves
10,0 5,0
Outdoor Temperature (°C)
Graph 1: Heating Curves
By cold weather
Too warm
OK
Too cold
Too warm
OK
Too cold
Too warm
OK
Too cold
2
1,75
1,5
1,25
1
0,75
0,5
0,25
0,0 -5,0 -10,0
The heating curve offset (setting 721) changes the
flow temperature of all curves, without the slope
being modified.
The corrective actions in case of discomfort are listed
in the following table:
Corrective action
Heating curve slope
Decrease
Decrease
OK
Decrease
OK
Increase
OK
Increase
Increase
-15,0 -20,0
Offset
Increase
Increase
Increase
OK
OK
OK
Decrease
Decrease
Decrease
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