Lochinvar Harmony - Manual (Page 28)

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APPENDIX
SYSTEM STARTUP MENU
• On the initial start-up, the Harmony will automatically step through the System Startup. After that, it must be reached
through the menu system.
• DO NOT make changes to the System Startup unless you have carefully checked the installation. An incorrect setting
in the System Startup menus may cause the Harmony to be unable to read the sensor, unable to output, or generally
just not operate the system.
• DO NOT make changes to the System Startup unless you have copied all other settings and are prepared to restore
them. Some changes in the System Startup may cause Operating, Stage, and System settings to revert to their default
values.
• From the main display, press the ADJUST/SELECT knob and release it to reach the Settings display.
• Scroll down to <System Startup> and select it.
• The screen will show System Startup and Select to continue.
• Read and follow the prompts until Sensor Type is displayed.
• Follow the directions starting on pg. 11 to set each item correctly.
WARNING: DO NOT make changes to the System Startup Menu without first carefully read-
ing the preceding section. Making changes to the System Startup may cause the Harmony
to no longer control the system or to control the system erratically.
EXTERNAL SET POINT (4-20MA EMS-CONTROL) RANGE
Set-Up
• The 4-20mA option is not available when using the Reset Function. It is only available for systems where the Sensor
Type is Temperature (see pg. 11).
• The 4-20mA range adjustment can only be reached through the System Startup menu system (see above).
• In the EMS-INPUT menu, press the ADJUST/SELECT knob to select EMS-Control.
• The next screen is EMS 4ma Setpoint. This screen allows you to set the desired Harmony Set Point when the EMS
input is 4mA. The temperature range of the selection is from 100 to 240°F. Rotate the ADJUST/SELECT knob until the
desired value is selected and then press the knob.
• The next screen is EMS 20ma Setpoint. This screen allows you to set the desired Harmony Set Point when the EMS
input is 20mA. The range of the selection is from 100 to 240°F. Rotate the ADJUST/SELECT knob until the desired
value is selected and then press the knob.
Operation
• The Set Point will vary linearly with the 4-20mA signal from the EMS
signal, as shown by the example set points in the chart on the right.
• Either 4 or 20mA can be the bottom (or top) of the Set Point range.
• If the signal from the EMS is not connected, is less than 3.9mA, or is
greater than 20.1mA, the Harmony Set Point will flash OFF and no
stages will be active. This feature can be used as an external shut-
down.
IMPORTANT: If the Harmony is not wired to the EMS, or if the signal
is less than 3.9mA or greater than 20.1mA, the display will flash
OFF. This indicates the input signal from the EMS is not properly
wired (see pg. 5) or the EMS system may not be correctly config-
ured.
4-20ma Input MOD-4 Set Point
4ma (adjustable setting) 100°F
8ma 125°F
12ma 150°F
16ma 175°F
20ma (adjustable setting) 200°F
4-20mA Temperature Example
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