Automatic Heating Modulex E8, Operation & User’S Manual

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MODULEX CONTROLLER OPERATION
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18. With the desired high set point temperature limit displayed, press the Program Key to set the T2
temperature (high set point limit). The red LED will go off.
19. This completes the required steps for setting the low and high limits corresponding to the set point
voltage and temperature functions. Proceed immediately to paragraph 4.3.4 to set the CURVE 11-
UA voltage.
4.3.4 Setting the Curve 11-UA Voltage
UA is a voltage level that will turn off the boiler. Therefore, the UA voltage level must be set below the
limit set for the U1 voltage. For example; if U1 is set for 1 Volt, UA should be set to 0.9 Volt (or lower).
After setting the low and high set point limits as described in paragraph 4.3.3, set the UA voltage as
follows:
1. Turn the Rotary Knob clockwise and scroll to CURVE 11-UA.
2. Press the Program Key. The red LED will light.
3. Using the Rotary Knob, adjust the UA voltage to below the voltage set for U1.
4. With UA set to the desired value, press the Program Key to store the setting. The red LED will go
off.
5. This completes all of the required entries for operation in the 0 to 10 Volt Remote Set Point Mode.
6. To exit the EXPERT menu - INSTALLATION sub-menu, continue scrolling using the Rotary Knob
until RETURN is displayed.
7. Press the Program Key to return to exit the INSTALLATION sub-menu.
8. To view the remote set point temperature, proceed to paragraph 4.3.5.
NOTE
When viewing the set point temperature using the steps in paragraph
4.3.5, you will note that the when the voltage source is equal to 0.9 Volt,
the set point temperature will drop to 41°C (9°C), thereby shutting down
the boiler.
Example: U1 = 1 Volt and the set point = 25°C
U2 = 8 Volts and the set point = 82°C
UA should be set to 0.9 Volt
4.3.5 Viewing the Set Point
The set point is displayed as follows:
1. Turn the Rotary Knob to the DISPLAY menu - INSTALLATION sub-menu.
2. Press the Program Key to enter the INSTALLATION sub-menu.
3. Using the Rotary Knob, scroll to T-EXT DES to view the set point temperature.
4.3.6 Enable/Disable & Pump Control
The Enable/Disable feature normally found between terminals 3 and 4 of connector
“I” will not stop/start
the boiler. Rather the boiler will fire as long as there is set point higher than the current boiler outlet
temperature. The Enable/Disable feature will however stop/start a pump if it connected to terminal 4
output of connector
“II” (the normal position for a pump hook up) and the boiler is in standby mode
( ). If using the terminal 4 output and it is desired to have the boiler and pump operational 24/7, the
boiler should be placed in day mode.