114 Operating the Boiler
11.6.7 Setting the Special Operation
Modes
To operate the boiler in special operation modes,
press the Back button (
) and the Menu button
(
) simultaneously for 3 seconds, and then select
“7. Special Operations”.
Rotate the Command dial (
) to switch between
the operation modes. Press the Command dial (
)
to select an operation mode.
The boiler resumes operation in normal operation
mode if no input is detected for 3 hours.
Press the Back button (
) to return to the previous
screen or menu.
Item
Description
1. Normal
Set the boiler to run in
Normal operation mode.
2. 1st MIN
Set the boiler to run in 1st
stage minimum operation
mode.
3. 1st MAX
Set the boiler to run
in 1st stage maximum
operation mode.
4. 2nd MIN
Set the boiler to run in
2nd stage minimum
operation mode.
5. 2nd MAX
Set the boiler to run in
2nd stage maximum
operation mode.
Item
Description
8. Zone3 Valve
Output
Test the zone 3 valve
operation.
●
The zone 3 valve is
turned on as soon
as you enter the test
mode.
●
Press the Command
dial (
) to toggle the
valve operation (On ->
Off / Off -> On).
●
This option is available
only when the “Zone
Valve System” is active.
9. Dual Venturi
Test the dual venturi
operation.
●
The dual venturi is
turned on as soon
as you enter the test
mode.
●
Press the Command
dial (
) to toggle the
dual venturi operation
(On -> Off / Off -> On).
Summary of Contents for NFB-175H
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