Navien NCB300-28K, Service Manual

Page: 34 / 108

System Details 33
Item Description
K. DHW Max Limit
Set the DHW supply maximum
temperature.
●
Setting range: [DHW minimum
capacity limit +20] % – 100%
●
Default: 100%
L. DHW Wait Time
Set the DHW wait time.
●
Setting range: 0 – 20 min
●
Default: 5 min
M. CH Min Burning Time
Set the low-load combustion
time at initial operation.
●
Setting range: 0 – 20 min
●
Default: 1 min
N. Burning Acceleration
Time
Set the time to reach the
maximum central heating
capacity after initial operation.
●
Setting range: 0 – 20 min
●
Default: 3 min
O. OTC ON/OFF
Enable or disable the outdoor
temperature compensation
control option.
P. K-Factor* K-Factor for the central heating
Q. WWSD Temp
Set the Warm Weather
Shutdown temperature.
●
Setting range: 10°C – 40°C
●
Default: OFF
R. WWSD On Diff
Set the differential temperature
to deactivate the Warm
Weather Shutdown.
●
Setting range: 1°C – 20°C
●
Default: 3°C
S. CH Heat Demand
Set the heat demand control
type for Navien thermostat,
Panel, Open Therm, CH
Thermostat, and Switched Live.
T. Supply Boost Time
Set the time that the
burner(CH) boost supply set
temperature.
U. Flow Detection Delay
Time
Set the time that delays flow
detection sequence.
V. Gas Use Compensation
setting
Adjust the gas usage estimates
to improve accuracy.
W. Parameter All Clear
All parameter setting to factory
default.
X. P/W Change
Change the parameter setting
password.
Press the Plus button
( ) or the Minus button ( )
to change numbers and places,
and press the ECO button ( )
to save the new password.
* 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.
Item Description
B. Supply MAX Set-point
Set the central heating supply
maximum temperature.
●
Setting range: [MIN Set-point
+ 20°C] – 90°C
●
Default: 90°C
C. CH Burner Off Diff
Set the temperature range to
turn off central heating.
●
Setting range: 0°C – 30°C
●
Default: 2°C
D. CH Burner On Diff
Set the temperature range to
turn on central heating.
●
Setting range: 1°C – 30°C
●
Default: 3°C
E. Anti Fast Cycling Time*
Set the anti-fast cycling time.
●
Setting range: 0 – 20 min
●
Default: 3 min
F. Freeze protection
Set the pump freeze protection
temperature.
●
Setting range: 6°C – 10°C
●
Default: 10°C
Note
The system
freeze protection
temperature is set
based on the pump
freeze protection
temperature.
G. Boiler Pump Delay
Set the boiler pump off delay
time.
●
Setting range: 30 – 40 min
●
Default: 40 min
H. CH Min Limit
Set the central heating
minimum heat capacity limit.
●
Setting range: Central heating
minimum capacity (%) –
[central heating minimum
capacity limit-20] %
●
Default: Boiler’s minimum
heat capacity
I. CH Max Limit
Set the central heating
maximum heat capacity limit.
●
Setting range: (Central
heating minimum capacity
limit + 20) % – 100%
●
Default: 100%
J. DHW Min Limit
Set the DHW supply minimum
temperature.
●
Setting range: DHW minimum
capacity (%) – [DHW MAX
capacity limit-20] %
●
Default: Boiler’s minimum
heat capacity