Lochinvar KNIGHT 400 - 801 - Manual (Page 26)

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Service Manual
1
Service
DHW Pump Anti-Seize Delay
If the boiler pump does not run for 24 hours, it will be turned
on briefly to prevent it from seizing. The length of time it runs
is determined by parameter I4. The range of this setting is 0
seconds to 40 minutes. The default setting is 20 seconds.
System Pump Anti-Seize Delay
If the boiler pump does not run for 24 hours, it will be turned
on briefly to prevent it from seizing. The length of time it runs
is determined by parameter I4. The range of this setting is 0
seconds to 40 minutes. The default setting is 20 seconds.
J: BMS
BMS Type (Power / Set Point)
When programmed for BMS control through the 0 - 10V BMS
input or through ModBus, the 0 - 10V signal can be interpreted
as either a modulation command or a set point. When
parameter J1 is set to POWER, the 0 - 10V signal will control
the modulation. When set to SETPOINT, the 0 - 10V signal will
control the SH set point. The default setting is POWER.
Volts at Minimum
When programmed for BMS control through the 0 - 10V BMS
input or through ModBus, parameter J2 should be set to the
minimum voltage signal sent to the SMART SYSTEM control.
The range of this parameter is 0.0V to the Volts at Minimum
value (parameter J3). The default setting is 2.0V.
Volts at Maximum
When programmed for BMS control through the 0 - 10V BMS
input or through ModBus, parameter J3 should be set to the
maximum voltage signal sent to the SMART SYSTEM control.
The range of this parameter is the Minimum value (parameter
J2) to 10.0V. The default value is 10.0V.
Rate at Minimum Volts
When programmed for BMS control through the 0 - 10V BMS
input or through ModBus and the BMS Type is programmed as
POWER, the modulation percentage represented by the Volts at
Minimum parameter (J2) is set by parameter J4. The
minimum value is 0% and the maximum is the Power at
Maximum Volts setting J5. The default value is 20%.
Rate at Maximum Volts
When programmed for BMS control through the 0 - 10V BMS
input or through ModBus and the BMS Type is programmed as
POWER, the modulation percentage represented by the Volts at
Maximum parameter (J3) is set by parameter J5. The
minimum value is the Power at Minimum Volts setting J4 and
the maximum is 100%. The default value is 100%.
I: Circulation pumps
System Pump Delay
The system pump delay parameter sets the length of time the
system pump (if connected) will run after a SH demand has
been satisfied. Setting the delay time to 0 will disable the
pump. This parameter is adjustable by the installer by
accessing parameter I1. The time range for this parameter is
0 minutes to 40 minutes. The default time is 30 seconds.
Boiler Pump Delay
The SH pump delay parameter sets the length of time the
boiler pump will run after a SH demand has been satisfied.
Setting the delay time to 0 will disable the pump. This
parameter is adjustable by the installer by accessing parameter
I2. The time range for this parameter is 0 minutes to 40
minutes. The default time is 30 seconds.
DHW Pump Delay
The DHW pump delay parameter sets the length of time the
DHW pump (if connected) will run after a DHW demand has
been satisfied. Setting the delay time to 0 will disable the
pump. This parameter is adjustable by the installer by
accessing parameter I3. The time range for this parameter is
0 minutes to 40 minutes. The default time is 30 seconds.
Boiler Pump Anti-Seize Delay
If the boiler pump does not run for 24 hours, it will be turned
on briefly to prevent it from seizing. The length of time it
runs is determined by parameter I4. The range of this setting
is 0 seconds to 40 minutes. The default setting is 20 seconds.
Boiler Pump Minimum Voltage
The speed of the boiler pump can be controlled by the
SMART SYSTEM control in order to maintain a minimum
ΔT through the heat exchanger. Thus, as the firing rate
decreases, the speed of the boiler pump can decrease as well.
The SMART SYSTEM control outputs a 0 - 10V signal to the
boiler pump to control its speed. Parameter I5 determines the
minimum voltage given to the boiler pump, thereby setting its
minimum speed. The range of this setting is 2.5V to 10V. The
default setting is 3.5V.
System Pump Type (CFH / WWSD) CFH = Call for
Heat, WWSD = Warm Weather Shutdown
The system pump can be programmed to operate in response
to any of the Room Thermostat inputs, or to run continuously
until the boiler goes into Outdoor Shutdown. To program the
system pump to operate only with a space heating call for
heat, set parameter I6 to CFH. To program the system pump
to run continuously until outdoor shutdown starts, set
parameter I6 to WWSD. The default setting is CFH.