Circulation Pumps - Lochinvar FTxl 500 Service Manual

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Service
(continued)
BAS T/O
This is the amount of time the unit controls will wait to
receive a communication string from the BMS controller
before reverting back to its own internal parameters. This
parameter is adjustable by the installer by accessing the BAS
T/O parameter. The adjustment range of this parameter is 5
seconds to 2 minutes. The default value is 10 seconds.

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.
Service Manual
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 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 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
2.5V to 10V. The default setting is 3.5V.
Service Notification
Service Notification in Months
When the boiler control determines that a scheduled service is
due based on days of installation, the boiler display will turn
yellow and a new status screen will appear informing the user
that maintenance is required. This parameter is adjustable
by the installer by accessing the Service Notification in Months
parameter. The time range for this parameter is 0 months to
100 months. The default time is 13 months.
Service Notification Running Time
When the boiler control determines that a scheduled service is
due based on the hours of actual operation, the boiler display
will turn yellow and a new status screen will appear informing
the user that maintenance is required. This parameter is
adjustable by the installer by accessing the Service Notification
Running Time parameter. The time range for this parameter is
0 hours to 17,500 hours. The default time is 8,760 hours.
Service Notification Cycles
When the boiler control determines that a scheduled service is
due based on the number of boiler cycles, the boiler display will
turn yellow and a new status screen will appear informing the
user that maintenance is required. This parameter is adjustable
by the installer by accessing the Service Notification Cycles
parameter. The range for this parameter is 0 cycles to 100,000
cycles. The default is 50,000 cycles.
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