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Operating information
(continued)
Monitor external limits
Connections are provided on the connection board for external
limits such as flow switch, low water cutoff, gas pressure
switches, and a louver proving switch. The SMART TOUCH
will shut off the burner and inhibit relighting whenever any of
these external limits open.
Run-time and alarm outputs
The boiler provides dry contacts for indicating when the boiler
is running, and when it is unable to operate.
Run-time and cycle counting
The control uses two timers to monitor the total hours of burner
operation. One timer monitors the time the boiler is in the
Space Heating Mode. The other timer monitors the time the
boiler is firing in the DHW Mode.
The control uses two (2) ignition counters to monitor the
amount of boiler cycles. The first counter counts all ignitions of
the control. The second counter counts only ignition attempts
that have failed.
Service reminder
The control can be programmed for service reminder
notification. This notification will become active when either a
set time frame has expired, or a set amount of running hours or
cycles has expired (all adjustable by the installer). The display
will show a Maintenance Required screen. The installer’s name
and phone number can be programmed into the control. This
information will appear on the Maintenance Required screen.
The service reminder notification can be reset or disabled by
the installer.
The time dependent feature has been disabled by the
manufacturer. To enable this feature change the parameter
to the desired time interval, reference the Knight XL Service
Manual for details regarding parameters.
Error logging
The control will hold in memory the last 10 lockouts as well as
the last 10 blockings. The date and time of the occurrence will
be recorded as well. Only the 10 most current occurrences of
each will be held in memory.
Boiler temperature regulation
Operating temperature (target)
The SMART TOUCH control module senses water temperature
and regulates boiler firing and firing rate to achieve a target
temperature. The target temperature can be set between 70°F
(21°C) and 190°F (88°C).
• Target temperature is fixed when the outdoor
sensor is not installed.
• Target temperature is calculated as described
on this page under “Outdoor Reset Operation”
and “Target Temperature Boost” when the
outdoor sensor is connected.
High limit operations
The Knight XL is equipped with adjustable automatic reset and
manual reset high limits. The automatic reset high limit has a
maximum set point of 200°F and the manual reset high limit
has a maximum set point of 210°F.
When the outlet temperature exceeds 200°F, the automatic
high limit action occurs. The boiler shuts down until the outlet
water temperature cools below 190°F, and a 60 second timer
has expired. If the outlet temperature continues to increase, the
manual reset high limit action will occur at 210°F.
High limit test procedure
1. Turn ON the main power to the boiler by placing the
ON/OFF switch in the ON position.
2. Navigate to the Setpoints Screen.
3. Use the slide bar to decrease the MRHL temperature
below the current outlet temperature or to its minimum
setting, whichever is higher.
4. Press the APPLY CHANGES button to save the setting.
5. If the current outlet temperature is above the MRHL
setting then the MRHL will function, causing a boiler
lockout. If the outlet temperature is below the MRHL
setting, navigate to the Service Screen and place the boiler
in service mode at full fire.
6. Once the outlet temperature rises above the MRHL
setting, the MRHL will function causing a boiler lockout.
7. Repeat steps 2-4 to set the MRHL to the desired setting
for normal operation.
Installation & Operation Manual
Neither this feature, the boiler control module, nor the use of
glycol eliminates the possibility of freezing. The installation
must still use recognized design, installation, and maintenance
practice to prevent freeze potential for the boiler and system.
NOTICE
When system return temperatures
are maintained below the dew point,
condensation will form on the inside of the
boiler jacket causing some internal sheet
metal components to rust.
The Freeze Protection feature will not work if the appliance
does not have power, is locked out, is in shutdown mode, had a
component failure, or is otherwise prevented from firing.
Freeze protection
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