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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
Monitor external limits
Connections are provided on the connection board for
external limits such as a flow switch, low water cutoff and
gas pressure switches. The SMART SYSTEM 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
firing 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 Outdoor Knight
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 SYSTEM control module senses water
temperature and regulates boiler firing and firing rate to
achieve a target temperature. The target temperature can be
set between 32°F and 190°F.
• Target temperature is calculated as described in the
“Outdoor Reset Operation” section, when the
outdoor sensor is connected.
• If the outdoor sensor is not connected, the target
temperature is fixed at SH (1 - 3) set points. An
outdoor sensor fault will remain on the display
screen until the outdoor sensor is reconnected.
High limit operations
The outdoor boiler 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.
8 Operating information (continued)
1. Turn ON the main power to the boiler by placing the
ON/OFF switch in the ON position.
2. From the Status Screen, press the NAVIGATION dial to
access the Set Points Screen.
3. Press the LEFT SELECT (LIMITS) key.
4. Select the manual reset high limit (MRHL) by rotating
the NAVIGATION dial counterclockwise, then press
the NAVIGATION dial.
5. Decrease the set point of the MRHL to below the current
outlet temperature (or to its minimum setting, whichever
is higher) by turning the NAVIGATION dial
counterclockwise.
6. Press the RIGHT SELECT [SAVE] key.
7. Press the RIGHT SELECT [HOME] key. The new
parameter will upload to the control.
8. If the current outlet temperature is above the new MRHL
set point, the MRHL will function causing boiler lockout.
If this occurs, skip to Step 11.
9. If the current outlet temperature is below the new MRHL
set point, locate the pinhole (SERVICE button) below the
RESET button on the display board. Insert a thin probe
(such as a paper clip) into the hole and press the button
continuously for five (5) seconds to place the boiler into
Service Mode. In Service Mode, the boiler will fire at
ignition speed and will then modulate up to full fire.
10. Once the outlet temperature rises up to the MRHL set
point, the MRHL will function, causing the boiler to shut
down and lock out.
11. Repeat Steps 2, 3 and 4.
12. Set the MRHL to the appropriate set point by turning the
NAVIGATION dial clockwise.
13. Repeat Steps 6 and 7.
14. Press the RESET button to clear the lockout.
15. If needed, press the RIGHT SELECT [STOP] key to exit
Service Mode.
Low water cutoff protection
1. The SMART SYSTEM control module uses temperature
sensing of both supply and return areas of the heat
exchanger. If the flow rate is too low or the outlet
temperature too high, the control module modulates and
shuts the boiler down. This ensures boiler shutdown in the
event of low water or low flow conditions.
2. Some codes and jurisdiction may accept these integral
features of the control in lieu of requiring an additional
limit control or low water cutoff. Consult local jurisdiction
to determine. A low water cutoff is available from the
factory (WTR30024).
Please note that the brackets ([]) denote
screen status.
NOTICE
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Outdoor Knight Boiler Installation & Operation Manual