Lochinvar Harmony - Manual (Page 15)

15
GAIN/THROTTLE
OPERATING MODE - NORMAL Default = 0
• The Gain adjusts the PID logic in the Harmony to control how much
modulation is changed when the system temperature is different
from the Set Point.
• A Gain of 0 is a good starting point for all systems.
• If, during normal load conditions, the system temperature tends to
fluctuate significantly above and below the Set Point, decrease the
Gain by two numbers (for example, from 0 to -2). Wait for at least 15
minutes before evaluating how the change has affected the system.
• If, during normal load conditions the system temperature tends to
remain consistently below the Set Point (or consistently above the
Set Point), increase the Gain by two numbers (for example, from 0 to
2). Wait for at least 15 minutes before evaluating how the change has
affected the system.
OPERATING MODE - PROCESS Default = 1.0
• The Gain acts as a throttling range around the Set Point.
• When the actual temperature is equal to the Set Point, the lead stage
will be at 100% modulation.
• Each throttling range above or below the Set Point controls one
stages modulation linearly from 0 to 100%.
• The Process Gain Table below shows the relationship between the
Gain and stage modulation.
• The Process Gain Table does not show all the possible modulation
values. The table is for example only. The Harmony will control the
modulation in one percent increments based on the Set Point and
Gain value.
--- SETTINGS ---
Set Point
>Gain
Lead Stage
--- GAIN ---
Value -> New Value
--- GAIN ---
Value -> New Value
PRESS TO SELECT
ADJUST
Press to
show
setting
PRESS TO SELECT
ADJUST
Turn to
adjust
value
PRESS TO SELECT
ADJUST
Press to
select
new
PROCESS GAIN/THROTTLING RANGE TABLE
GAIN - GAIN - GAIN - GAIN - GAIN -
THRTHRTHRTHRTHR
OOOOO
TTLETTLETTLETTLETTLE
1 x Gain Above Set Point Lead Stage at 0%
At Set Point Lead Stage at 100%
0.5 x Gain Below Set Point Lead Stage at 100%, 1 Lag at 50%
1x Gain Below Set Point Lead and 1 Lag at 100%
2 x Gain Below Set Point Lead and 2 Lag at 100%
3 x Gain Below Set Point All Stages at 100%
2 x Gain Above Set Point Lead Stage at 0%
2.5 x Gain Setting Above Set Point All Stages OFF
0.5 x Gain AboveSet Point Lead Stage at 50%
SYSTEM TEMPERATURE STAGES MODULATION
3 x Gain Setting Above Set Point All Stages OFF
2.5 x Gain Below Set Point Lead and 2 Lag at 100%