Lochinvar Harmony - Manual (Page 14)

14
OPERATING SETTINGS
CHANGE SET POINT, GAIN, LEAD STAGE
THE MAIN DISPLAY
• The main display screen may have different values in the top two
lines depending on the application.
• The third line shows the four stages. The Lead Stage will be in
brackets. For example, the Lead Stage shown at left is <A>.
• The last line shows the status of each stage. The stages may be Off
or the actual percent modulation will be displayed.
• To reach the Settings menu, press the ADJUST/SELECT knob and
release it.
SET POINT
SET POINT DISPLAY
• The Set Point is the temperature value the Harmony will use to
control the system.
• The Harmony will either increase the amount of modulation,
decrease the amount of modulation, or maintain the same amount of
modulation to maintain the system temperature around the Set Point.
• The Set Point is the target temperature the Harmony will maintain.
The system can be expected to fluctuate above and below the Set
Point. The size of the fluctuation depends on the number of stages,
the system load, and the Operating Mode selected (see pg. 13).
Outdoor Cutoff Temperature
• If the outdoor sensor is installed (see pg. 7), the Outdoor Cutoff
screen will automatically appear after the Set Point has been
selected.
• When the outdoor temperature falls to the adjustable Outdoor
Cutoff temperature, the Harmony will control and modulate stages to
hold the temperature Set Point.
• When the outdoor temperature rises to the Outdoor Cutoff tempera-
ture plus a 2°F differential, the Harmony will disable the system.
RESET °F AND RESET °C
• The Set Point is based on the Reset Ratio, Offset, and Outdoor
Cutoff. To make these settings, see pg. 25.
EXTERNAL SET POINT (4-20mA EMS- CONTROL)
• The Set Point value can only be changed by adjusting the 4-20mA
input wired into the Harmony, see pg. 28.
• Rotating the ADJUST/SELECT button will have no impact on the
Set Point value.
--- SETTINGS ---
>Set Point
Gain
Lead Stage
--- SET POINT ---
Value
--- SET POINT ---
Value -> New Value
--- SET POINT ---
Value -> New Value
Temperature
<A> B C D
OFF OFF OFF OFF
PRESS TO SELECT
ADJUST
Press to
show
Settings
PRESS TO SELECT
ADJUST
Press to
show
Set Point
PRESS TO SELECT
ADJUST
Turn to
adjust
value
PRESS TO SELECT
ADJUST
If the optional Outdoor Sensor
is installed
-- OUTDOOR CUTOFF --
Value -> New Value
-- OUTDOOR CUTOFF --
Value -> New Value
PRESS TO SELECT
ADJUST
Turn to
adjust
value
PRESS TO SELECT
ADJUST
Press to
select
new
SET POINTSET POINTSET POINTSET POINTSET POINT