Navien NCB500-2S/37K Service Manual page 30

4.4.7.2 Setting the Central Heating Operation
To set the boiler's central heating operation, press the Menu
button ( ), and then select "2. Central Htg Operation".
Press the Up button ( ) or the Down button (
between the list items or to increase/decrease setting values.
Press the OK button ( ) to select an item or to confirm after
making changes.
Press the Back button ( ) to return to the previous screen or
menu.
Item
1. Central Htg ON/ OFF
1-1 CH Set Temp
2. OTC ON/OFF
2-1 K-Factor*
) to switch
Description
Enable or disable central
heating operation.
Setting range: Enable/Disable
●
Default: Enable
●
Set the central heating target
temperature (°C)
Setting range for central
●
heating supply water: 40°C
(Absolute MIN) – 90°C
(Absolute MAX)
Setting range for central
●
heating return water: 30°C
(Absolute MIN) – 65°C
(Absolute MAX)
Default: 60°C
●
This option is available only
when "1. Central Htg ON/OFF" is
set to "Enable".
Enable or disable the outdoor
temperature compensation
control option.
K-Factor for the central heating
Item
3. WWSD Temp
4. WWSD On Diff
5. Central Htg Control
6. CH Heat Demand
7. CH Schedule
* When the boiler is connected to an outdoor temperature sensor
(optional), functioning may be activated according to outdoor
temperature conditions and K-factor values using the parameters.
Description
Set the Warm Weather Shut-
down temperature.
Setting range: 10°C – 40°C
●
Default: OFF
●
Set the differential temperature
to deactivate the Warm
Weather Shutdown.
Setting range: 1°C – 20°C
●
Default: 3°C
●
Select the heating control type.
1: Supply Temperature
2: Return Temperature
Default: Supply Temperature
●
Set the heat demand control
type for Navien Thermostat,
OpenTherm, CH Thermostat
and Switched Live.
Default: Navien Thermostat
●
Set the central heating weekly
timer.
To select this option,
Note
you must set up the
Time settings in the
Configuration menu.
If you select an item, you can
select the certain day to schedule
the central heating modes.
The schedule settings
Note
and checking function
cannot be used when
the Heat Demand
function is set to
Navien Thermostat.
Item Description
Schedule a command for
1. 7 Day
each day of the week.
2. 5 + Schedule a command for
2 Day weekday and weekend.
Schedule a command
3. 5 + 1 +
for weekdays, Saturdays,
1 Day
and Sundays.
4. OFF Disable the schedule
(Not Used) function.
System Details 29