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1 Service (continued)
Service Manual
DHW Blocks Sys Pump
When the indirect DHW tank is connected as a zone on the
primary loop, the DHW Blocks Sys Pump parameter tells the
system pump if it is allowed to run during a DHW demand.
To force the system pump to turn off during a DHW demand,
set the DHW Blocks Sys Pump parameter to YES. The default
setting is NO.
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 50 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 the System Pump Anti-Seize Delay parameter.
The range of this setting is 0 seconds to 50 minutes. The default
setting is 20 seconds.
BMS
BMS Type
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 the BMS
Type parameter 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 SETPOINT.
Volts at Minimum
When programmed for BMS control through the 0 - 10V BMS
input or through ModBus, the Volts at Minimum parameter
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 Maximum value. The default setting is 2.0V.
Volts at Maximum
When programmed for BMS control through the 0 - 10V BMS
input or through ModBus, the Volts at Maximum parameter
should be set to the maximum voltage signal sent to the
SMART SYSTEM control. The range of this parameter is the
Volts at Minimum value 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 is set by the Rate at Minimum Volts
parameter. The minimum value is 0% and the maximum is
the Rate at Maximum Volts setting. 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 is set by the Rate at Maximum Volts
parameter. The minimum value is the Rate at Minimum Volts
setting and the maximum is 100%. The default value is 100%.
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.
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 50
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
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 2.5V to 10V. The default setting is
3.5V.
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 the boiler goes 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.
DHW Forces Sys Pump
When the indirect DHW tank is connected as a zone on the
primary loop, the DHW Forces Sys Pump parameter tells the
system pump if it must run when there is a DHW demand.
To have the system pump constantly running during a DHW
demand, set the DHW Forces Sys Pump parameter to YES (the
parameter DHW Blocks Sys Pump must be set to NO). If this
parameter and the DHW Blocks Sys Pump parameter are both
set to NO, the system pump operation will be based strictly on
the System Pump Type parameter setting. The default setting
of this parameter is YES.