50
16.5.5
SHIFT HEATING CURVE
The shift heating curve parameter shifts the actual setpoint above the calculated setpoint by the programmed value
(see
Figure 4.1
)
.
The shift can be adjusted in ½
increments using the
Up
or
Down
buttons and the desired value stored by pressing
the
Enter/Reset
button. The temperature range of this parameter is -15
C to 15
C. The default value is 0
C. At
0
C the function is inactive.
FIGURE 16.1
OUTDOOR AIR RESET CURVE
16.5.6
BOOST TEMPERATURE
If a CH demand lasts longer than the programmed time delay setting (see below) and there have been no DHW
demands, the control will increase the boiler outlet temperature set point by the amount programmed in this
parameter. If the CH demand continues through another time period, the set point will be increased again. This will
continue until either the CH demand ends, a maximum of 20 increases has occurred, or the maximum set point has
been reached. Once the CH demand has been satisfied the set point will revert back to its calculated setting.
The boost temperature can be adjusted in ½
increments using the
Up
or
Down
buttons and the desired value stored
by pressing the
Enter/Reset
button. The temperature range of this parameter is 0
C to 25
C. The default value is
0
C. At 0
C the function is inactive.
16.5.7
BOOST TIME
The boost time is the time delay that must elapse during a CH demand before the outlet temperature setpoint will be
increased.
The time range of this parameter can be adjusted between 0 and 250 minutes using the
Up
and
Down
buttons. Once
the desired time period has been set, the
Enter/Reset
button should be pressed to store the value. The default time
delay is 20 minutes.
