Knight 100 Series, Service Manual

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1
Service
(continued)
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 or outdoor shutdown has begun. This
parameter is adjustable by the installer by accessing the
System Pump Delay parameter. The time range for this
parameter is 1 second 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 the
Boiler
Pump Delay parameter. The time range for this parameter is
1 second 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. This parameter is adjustable by the installer by
accessing the
DHW Pump Delay parameter. The time range
for this parameter is 10 seconds to 40 minutes. The default
time is 1 minute.
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 the
System Pump Anti-Seize
Delay parameter. The range of this setting is 0 seconds to 40
minutes. The default setting is 20 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 the
Boiler Pump Anti-Seize
Delay parameter. The range of this setting is 0 seconds to 40
minutes. The default setting is 20 seconds.
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 the
DHW Pump Anti-Seize
Delay parameter. The range of this setting is 0 seconds to 40
minutes. The default setting is 20 seconds.
System Pump Type
The system pump can be programmed to operate in response
to any of the Room Thermostat inputs, or to run continuously
until all three (3) SH demands go into Outdoor Shutdown.
To program the system pump to operate only with a space
heating call for heat, set the
System Pump Type parameter to
CFH. To program the system pump to run continuously until
outdoor shutdown starts, set the
System Pump Type parameter
to WWSD. The default setting is CFH.
Boiler Pump Type
This parameter determines how the control turns the boiler
circulating pump on and off. The choices are CONSTANT
and VARIABLE. When set to CONSTANT, the control will
use an external relay to cycle power supply to the boiler pump.
The CONSTANT setting can be used with either a fixed or
variable speed circulating pump. When set to VARIABLE and
wired to 0 - 10V BLR PUMP OUT on the low voltage board,
the control will send a standby signal to turn off the pump. The
VARIABLE setting should be used when controlling the ECM
variable speed boiler pump provided by the factory. The default
setting is CONSTANT.
Boiler Pump Delta T Set Point
When using a variable speed boiler pump, and controlling it
by means of the 0 - 10V Boiler Pump Speed Output, the boiler
pump will be controlled in order to maintain a minimum Delta
T across the heat exchanger in the boiler (other factors may
override this target). This feature is to be used with Primary /
Secondary piping systems only. A system supply sensor MUST
be installed. This parameter sets the target minimum Delta T
it will use. The range of this parameter is 15°F (8°C) to 60°F
(33°C). The default value is 20°F (11°C).
Boiler Pump Minimum Voltage
The speed of the boiler pump can be controlled by the SMART
SYSTEM control in order to maintain a minimum

T 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. The
Boiler Pump Minimum Voltage parameter
determines the minimum voltage given to the boiler pump,
thereby setting its minimum speed. The range of this setting is
0V to 10V. The default setting is 3V.
Boiler Pump Maximum Voltage
The SMART SYSTEM control outputs a 0 - 10V signal to
control the speed of the boiler circulator. The
Boiler Pump
Maximum Voltage parameter sets the maximum voltage signal
to the boiler pump, thereby limiting its maximum speed. The
range of this setting is Boiler Pump Minimum Voltage setting
to 10V. The default setting is 10V.
Service Manual