LP-719 Rev. 000 Rel. 000 Date 6.25.20
56
AUTO
1
The Parallel Shift can be adjusted from the home screen using the CH + and - buttons
(Figure 57, Item 8).
With the first press of the CH + or - button, the display shows the current CH target
temperature (e.g., 130
o
F).
After a 3-5 second delay, the display begins flashing the current offset (Parallel Shift)
setting. Subsequent CH + or - button presses adjusts the offset up or down.
After a few seconds the display shows the new CH target temperature (e.g., 138
o
F), then
returns to the home screen.
Figure 65 - Automatic Boost
10 min
10 min
10 min
+ 10%
+ 10%
Each line represents a
1% decrease in setpoint
per minute
after the call has been met
Slope of O
ut
door R
eset C
ur
ve
Thermostat
Off
Thermostat
Off
Thermostat
On
I. Auto Boost
(e.g. Parameter 4.7.5 for Zone 1)
When enabled (4.7.5 = 1), Auto Boost acts to
automatically adjust the Slope of the Outdoor Reset
Curve to better match the needs of the heating system.
The function boosts the boiler target temperature by
increasing the Slope 10% every 10 minutes a call for heat
is continuously active, to a maximum of 2X the nominal
Slope setting (4.2.2). While the heat call is satisfied, the
Slope decreases by 1% every minute to a minimum of
the nominal Slope setting (4.2.2). Auto Boost is only
applicable when 4.2.1 = 3 or 4.
NOTE:
The boiler supply temperature is limited
upwards by the fixed maximum temperature (4.2.5) and
downwards by the fixed minimum temperature (4.2.6).
H. Parallel Shift of Reset Curve
(e.g. Parameter 4.2.3 for Zone 1)
When the Reset Curve results in a boiler target
temperature that is too high or too low (i.e., heats the
building too quickly or slowly), Parallel Shift can be used
to offset the curve up or down to increase or decrease
the boiler target temperature.
NOTE:
Adjusting Parallel Shift is only possible when
Auto Boost is OFF (4.7.5 = 0).
Figure 64 - Parallel Shift of Reset Curve
179 °F
120 °F
20 °F
0,4
3,5
1,3
Default
65 °F
80 °F
Tar
get CH supply t
emper
atur
e
Tar
get CH supply t
emper
atur
e
Tar
get CH supply t
emper
atur
e
Outdoor temperature
179 °F
120 °F
Outdoor temperature
Decrease parallel shift
Increase parallel shift
+25°F
0 °F
-25°F
Default
179 °F
120 °F
Outdoor temperature
