Lochinvar KNIGHT 399 - 800 Guide

User’s Information Manual
Models: 399 - 800
If the information in this manual is not followed exactly, a fire or
explosion may result causing property damage, personal injury or
loss of life.
This appliance MUST NOT be installed in any location where
gasoline or flammable vapors are likely to be present.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in your
building.
• Immediately call your gas supplier from a near by phone.
Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
• Installation and service must be performed by a qualified
installer, service agency, or the gas supplier.
WARNING
Save this manual for future reference.
KBX-USER Rev F

2
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or
to important information concerning the life of the product.
DANGER
WARNING
CAUTION
CAUTION
NOTICE
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not
related to personal injury or property damage.
Contents
HAZARD DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PLEASE READ BEFORE PROCEEDING . . . . . . . . . . . . 3
1. PREVENT COMBUSTION AIR CONTAMINATION . . . 4
2. MAINTENANCE SCHEDULE . . . . . . . . . . . . . . . . . . . . 5
Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Boiler Must Be Serviced and Maintained . . . . . . . . . . 6
Check Boiler Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Check Pressure Temperature Gauge . . . . . . . . . . . . . 6
Check Vent Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Check Air Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Check Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Check Condensate Drain System . . . . . . . . . . . . . . . . 6-7
Check Air Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Test Low Water Cutoff (if installed) . . . . . . . . . . . . . . . 8
Reset Button (low water cutoff) . . . . . . . . . . . . . . . . . . 8
Check Boiler Piping (gas and water) . . . . . . . . . . . . . . 8
Operate Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Shut Boiler Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3. OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . 9
4. SMART SYSTEM CONTROL MODULE
Knight XL Control Module . . . . . . . . . . . . . . . . . . . . . . . . 10
Access Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Saving Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Parameter Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
A: General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
B: Temperature Settings . . . . . . . . . . . . . . . . . . . . . . . 13
C: Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
E: DHW Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
F: Outdoor Air Reset . . . . . . . . . . . . . . . . . . . . . . . . . 14
Status Display Screens . . . . . . . . . . . . . . . . . . . . . . . . . . 15-18
NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Revision Notes . . . . . . . . . . . . . . . . . . . . . . . . . Back Cover

User’s Information Manual
Please read before proceeding
The Knight XL Installation and
Operation Manual along with the
Knight XL Service Manual are for use
only by a qualified heating
installer/service technician. Refer only
to this User’s Information Manual for
your reference. Improper installation,
adjustment, alteration, service or
maintenance can cause property
damage, personal injury (exposure to
hazardous materials) or loss of life.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier (who
must read and follow the supplied
instruction before installing, servicing,
or removing this boiler. This boiler
contains materials that have been
identified as carcinogenic, or possibly
carcinogenic, to humans).
Failure to adhere to the guidelines on
this page can result in severe personal
injury, death, or substantial property
damage.
Boiler service and maintenance –
• To avoid electric shock, disconnect electrical supply
before performing maintenance.
• To avoid severe burns, allow boiler to cool before
performing maintenance.
Boiler operation –
• Do not block flow of combustion or ventilation air to
the boiler. This boiler is equipped with a control which
will automatically shut down the boiler should air or
vent be blocked. If vent or air blockage is easily
accessible and removable, remove it. The boiler should
attempt to restart. If blockage is not obvious or cannot
be removed, have the boiler and system checked by a
qualified service technician.
• Should overheating occur or gas supply fail to shut off,
do not turn off or disconnect electrical supply to the
circulator. Instead, shut off the gas supply at a location
external to the appliance.
• Do not use this boiler if any part has been under water.
The possible damage to a flooded appliance can be
extensive and present numerous safety hazards. Any
appliance that has been under water must be replaced.
Boiler water –
• Thoroughly flush the system (without boiler
connected) to remove sediment. The high-efficiency
heat exchanger can be damaged by build-up or
corrosion due to sediment.
• Do not use petroleum-based cleaning or sealing
compounds in the boiler system. Gaskets and seals in
the system may be damaged. This can result in
substantial property damage.
• Do not use “homemade cures” or “boiler patent
medicines”. Serious damage to the boiler, personnel,
and/or property may result.
• Continual fresh make-up water will reduce boiler life.
Mineral buildup in the heat exchanger reduces heat
transfer, overheats the stainless steel heat exchanger,
and causes failure. Addition of oxygen carried in by
makeup water can cause internal corrosion. Leaks in
boiler or piping must be repaired at once to prevent
makeup water.
Freeze protection fluids –
• NEVER use automotive antifreeze. Use only inhibited
propylene glycol solutions, which are specifically
formulated for hydronic systems. Ethylene glycol is
toxic and can attack gaskets and seals used in hydronic
systems.
When calling or writing about the boiler
– Please have the boiler model and serial
number from the boiler rating plate.
Consider piping and installation when
determining boiler location.
Any claims for damage or shortage in
shipment must be filed immediately
against the transportation company by
the consignee.
Factory warranty (shipped with unit)
does not apply to units improperly
installed or improperly operated.
3
NOTICE
WARNING
NOTICE

User’s Information Manual
1 Prevent combustion air contamination
4
If the boiler combustion air inlet is located
in a laundry room or pool facility, for
example, these areas will always contain
hazardous contaminants.
To prevent the potential of severe personal
injury or death, check for areas and products
listed in Table 1A before installing the boiler
or air inlet piping.
If contaminants are found, you MUST:
• Remove contaminants permanently.
—OR—
• Relocate air inlet and vent
terminations to other areas.
WARNING
WARNING
Products to avoid:
Spray cans containing chloro/fluorocarbons
Permanent wave solutions
Chlorinated waxes/cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric acid/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning solvents
found in household laundry rooms
Adhesives used to fasten building products and other
similar products
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
Remodeling areas
Garages with workshops
Table 1A Corrosive Contaminants and Sources
WARNING If the boiler combustion air inlet is located in
any area likely to cause contamination, or if
products which would contaminate the air
cannot be removed, you must have the
combustion air and vent re-piped and
terminated to another location.
Contaminated combustion air will damage
the boiler, resulting in possible severe
personal injury, death, or substantial
property damage.
Pool and laundry products and common household and hobby
products often contain fluorine or chlorine compounds. When
these chemicals pass through the boiler, they can form strong
acids. The acid can eat through the boiler wall, causing serious
damage and presenting a possible threat of flue gas spillage or
boiler water leakage into the building.
Please read the information listed in Table 1A. If contaminating
chemicals will be present near the location of the boiler
combustion air inlet, have your installer pipe the boiler
combustion air and vent to another location, per the Knight XL
Installation and Operation Manual.

User’s Information Manual
2 Maintenance schedule
5
WARNING Follow the maintenance procedures given throughout this manual. Failure to perform the service and
maintenance or follow the directions in this manual could result in damage to the boiler or system,
resulting in severe personal injury, death, or substantial property damage.
Service technician
(see the Knight XL Service Manual)
General:
• Address reported problems
• Inspect interior; clean and vacuum if
necessary;
• Clean condensate trap and fill with fresh
water
• Check for leaks (water, gas, flue,
condensate)
• Verify flue and air lines in good condition
and sealed tight
• Check system water pressure/system
piping/expansion tank
• Check control settings
• Check ignition and flame sense
electrodes (sand off any deposits; clean
and reposition)
• Check wiring and connections
• Perform start-up checkout and
performance verification per Section 10
in the Knight XL Installation and
Operation Manual.
• Flame inspection (stable, uniform)
• Flame signal (at least 10 microamps at
high fire)
• Clean the heat exchanger if flue
temperature is more than 54°F (30°C)
above return water temperature.
If combustion or performance
indicate need:
• Clean heat exchanger
• Remove and clean burner using
compressed air only
• Clean the blower wheel
Owner maintenance
(see pages 6 - 8 for detailed instructions)
Daily
• Check boiler area
• Check pressure/temperature
gauge
Monthly
• Check vent piping
• Check air piping
• Check air and vent termination
screens
• Check relief valve
• Check condensate drain system
• Check air vents
Periodically • Test low water cutoff (if used)
• Reset button (low water cutoff)
Every
6 months
• Check boiler piping (gas and
water) for leaks
• Operate relief valve
End
of season
months
• Shut boiler down (unless boiler
used for domestic hot water)
ANNUAL START-UP

User’s Information Manual
6
2 Maintenance schedule
Maintenance procedures
Boiler must be serviced and maintained
WARNING The boiler must be inspected and started
annually at the beginning of the heating
season by a qualified service technician. In
addition, the maintenance and care of the
boiler designated on page 5 of this manual
and explained on pages 6 through 8 must be
performed to assure maximum boiler
efficiency and reliability. Failure to service
and maintain the boiler and system could
result in equipment failure, causing possible
severe personal injury, death, or substantial
property damage.
NOTICE The following information provides detailed
instructions for completing the maintenance
items listed in the maintenance schedule on
page 5. In addition to this maintenance, the
boiler must be serviced and started up at the
beginning of each heating season by a
qualified service technician.
Check boiler area
WARNING To prevent potential of severe personal
injury, death, or substantial property
damage, eliminate all materials discussed
below from the boiler vicinity and the
vicinity of the boiler combustion air inlet. If
contaminants are found:
Remove products immediately from the area.
If they have been there for an extended
period, call a qualified service technician to
inspect the boiler for possible damage from
acid corrosion.
If products cannot be removed, immediately
call a qualified service technician to re-pipe
vent and air piping and locate vent
termination/air intake away from
contaminated areas.
1. Combustible/flammable materials -- Do not store
combustible materials, gasoline or any other flammable
vapors or liquids near the boiler. Remove immediately if
found.
2. Air contaminants -- Products containing chlorine or
fluorine, if allowed to contaminate the boiler intake air,
will cause acidic condensate in the boiler. This will cause
significant damage to the boiler if allowed to continue.
Read the list of potential materials listed in Table 1A on
page 4 of this manual. If any of these products are in the
room from which the boiler takes its combustion air, they
must be removed immediately or the boiler combustion
air (and vent termination) must be relocated to another
area.
Check pressure/temperature gauge
1. Make sure the pressure reading on the boiler pressure/
temperature gauge does not exceed 24 psi (165.5 kPa).
Higher pressure may indicate a problem with the
expansion tank.
2. Contact a qualified service technician if problem persists.
Check vent piping
1. Visually inspect the flue gas vent piping for any signs of
blockage, leakage, or deterioration of the piping. Notify
your qualified service technician at once if you find any
problems.
WARNING Failure to inspect the vent system as noted
above and have it repaired by a qualified
service technician can result in vent system
failure, causing severe personal injury or
death.
Check air piping
1. Visually inspect the air inlet termination to be sure it is
unobstructed. Inspect the entire length of air piping to
ensure piping is intact and all joints are properly sealed.
2. Call your qualified service technician if you notice any
problems.
Check relief valve
1. Inspect the boiler relief valve and the relief valve
discharge pipe for signs of weeping or leakage.
2. If the relief valve often weeps, the expansion tank may
not be working properly. Immediately contact your
qualified service technician to inspect the boiler and
system.
Check condensate drain system
1. Inspect the condensate drain line, condensate PVC
fittings and condensate trap.
Fill condensate trap with water
1. Remove the PVC cap retaining screw from the PVC cap
(FIG. 2-1).
2. Remove the 2" PVC cap with the switch located at the top
of the trap (FIG. 2-1).

User’s Information Manual
2 Maintenance schedule (continued)
7
3. Fill with fresh water until the water begins to pour out
of the drain.
4. Replace the cap. Press the cap onto the trap until the
cap makes contact with the drain.
5. Replace the retaining screw.
WARNING The condensate trap (FIG. 2-1) must be
filled with water during all times of
boiler operation to avoid flue gas
emission from the condensate drain line.
Failure to fill the trap could result in
severe personal injury or death.
PVC TEE ASSEMBLY
(FACTORY SUPPLIED)
TO FLOOR
DRAIN
2” PVC CAP WITH
BLOCKED DRAIN SWITCH
RETAINING
SCREW
CONDENSATE FROM
HEAT EXCHANGER
Figure 2-1 Condensate Trap
Condensate disposal
1. This boiler is a high efficiency appliance that produces
condensate.
2. The side of the boiler has a 1/2 inch PVC union for
connection of a 1/2 inch PVC pipe (FIG. 2-2).
3. Slope condensate tubing down and away from the
boiler into a drain or condensate neutralizing filter.
Condensate from the Knight XL will be slightly acidic
(typically with a pH from 3 to 5). Install a neutralizing
filter if required by local codes. Call your qualified
service technician to inspect the boiler and system.
A Neutralizer Kit is available from the factory
(Kit 3087 for Models 399 - 500 and Kit 30002 for
Models 600 - 800). Call your qualified service
technician to install.
4. Install the 1/2 inch PVC tee assembly (shipped with the
unit) as shown in FIG. 2-2. Call your qualified service
technician to inspect the boiler and system.
5. Leave the top of the 1/2 inch tee OPEN. This is needed
as a vacuum break.
6. Do not expose condensate line to freezing temperatures.
7. Use only plastic tubing or piping as a condensate drain
line (FIG. 2-2).
Use materials approved by the authority
having jurisdiction. In the absence of
other authority, PVC and CPVC pipe must
comply with ASTM D1785 or D2845.
Cement and primer must comply with
ASME D2564 or F493. For Canada use
CSA or ULC certified PVC or CPVC pipe,
fittings, and cement.
8. A condensate removal pump is required if the boiler is
below the drain. When installing a condensate pump,
select one approved for use with condensing boilers and
furnaces. The pump should have an overflow switch to
prevent property damage from condensate spillage. Call
your qualified service technician to inspect
the boiler and system.
NOTICE
NOTICE To allow for proper drainage on large
horizontal runs, a second line vent may be
required and tubing size may need to
increase to 1 inch.
The condensate line must remain
unobstructed, allowing free flow of
condensate. If condensate is allowed to
freeze in the line or if the line is obstructed
in any other manner, condensate can exit
from the boiler tee, resulting in potential
water damage to property. Call your
qualified service technician to inspect
the boiler and system.
1/2" (12.7 mm) PVC UNION
(FACTORY SUPPLIED)
NEUTRALIZER KIT
FLOOR DRAIN OR
DRAIN PAN
1/2" (12.7 mm) PVC TEE ASSEMBLY
(FACTORY SUPPLIED)
Figure 2-2 Condensate Disposal

User’s Information Manual
2 Maintenance schedule
8
WARNING Have leaks fixed at once by a qualified
service technician. Failure to comply could
result in severe personal injury, death, or
substantial property damage.
Operate relief valve
1. Before proceeding, verify that the relief valve outlet has
been piped to a safe place of discharge, avoiding any
possibility of scalding from hot water.
WARNING To avoid water damage or scalding due to
valve operation, a metal discharge line
must be connected to the relief valve outlet
and run to a safe place of disposal. This
discharge line must be installed by a
qualified heating installer or service
technician in accordance with the
instructions in the Knight XL Installation
and Operation Manual. The discharge line
must be terminated so as to eliminate
possibility of severe burns or property
damage should the valve discharge.
2. Read the boiler pressure/temperature gauge to make
sure the system is pressurized. Lift the relief valve
top lever slightly, allowing water to relieve through
the valve and discharge piping.
3. If water flows freely, release the lever and allow the valve
to seat. Watch the end of the relief valve discharge pipe
to ensure that the valve does not weep after the line has
had time to drain. If the valve weeps, lift the seat again to
attempt to clean the valve seat. If the valve continues to
weep afterwards, contact your qualified service
technician to inspect the valve and system.
4. If water does not flow from the valve when you lift the
lever completely, the valve or discharge line may be
blocked. Immediately shut down the boiler, following
the operating instructions on page 9 of this manual. Call
your qualified service technician to inspect the boiler and
system.
Shut boiler down (unless boiler is used
for Domestic Water)
1. Follow “To Turn Off Gas to Appliance” on page 9 of this
manual.
2. Do not drain the system unless exposure to freezing
temperatures will occur.
3. Do not drain the system if it is filled with an antifreeze
solution.
4. DO NOT shut down boilers used for domestic water
heating, they must operate year-round.
Check Air Vents
1. Reference FIG. 3 below.
2. Visually inspect vent to make sure that no leaks are present.
3. If there is leaking, tighten the needle valve.
4. If the leak continues, replace the air vent.
3. Replace the front access door.
Test low water cutoff (if installed)
1. If the system is equipped with a low water cutoff, test the
low water cutoff periodically during the heating season,
following the low water cutoff manufacturer’s
instructions.
Reset button (low water cutoff)
1. Testing the low water cutoff shuts the unit off. Press the
RESET button on the low water cutoff to turn the unit
back on.
Check boiler piping (gas and water)
1. Remove the boiler front access door and perform a gas
leak inspection per steps 1 through 7 of the Operating
Instructions on page 9. If gas odor or leak is detected,
immediately shut down the boiler following the procedure
on page 9. Call a qualified service technician.
2. Visually inspect for leaks around water piping.
Also inspect the circulators, relief valve, and fittings.
Immediately call a qualified service technician to repair
any leaks.
NEEDLE
VALVE
Figure 2-3 Air Vent

User’s Information Manual
9
3 Operating instructions
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury, or loss of life.
A. This appliance does not have a pilot. It is
equipped with an ignition device which
automatically lights the burner. Do not try
to light the burner by hand.
B. BEFORE OPERATING smell all around
the appliance area for gas. Be sure to
smell next to the floor because some gas
is heavier than air and will settle on the
floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do
not use any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
C. Use only your hand to turn the gas control knob.
Never use tools. If the handle will not turn by
hand, don’t try to repair it, call a qualified service
technician. Force or attempted repair may result
in a fire or explosion.
D. Do not use this appliance if any part has been
under water. Immediately call a qualified
service technician to inspect the appliance and
to replace any part of the control system and
any gas control which has been under water.
• If you cannot reach your gas supplier, call
the fire department.
1. STOP! Read the safety information
above on this label.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the
appliance.
4. This appliance is equipped with an
ignition device which automatically lights
the burner. Do not try to light the burner
by hand.
5. Remove top cover.
6. Turn gas shutoff valve counterclockwise
to “OFF”. Handle will be perpendicular to
pipe. Do not force.
7. Wait five (5) minutes to clear out any gas.
If you then smell gas, STOP! Follow “B”
in the safety information above on this label.
If you don’t smell gas, go to next step.
8. Turn gas shutoff valve clockwise to “ON”.
Handle will be parallel to pipe.
9. Install top cover.
10. Turn on all electric power to appliance.
11. Set thermostat to desired setting.
12. If the appliance will not operate, follow the
instructions “To Turn Off Gas To Appliance” and
call your service technician or gas supplier.
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance
if service is to be performed.
3. Remove top cover.
4. Turn gas shut off valve counterclockwise to
“OFF”. Handle will be perpendicular to pipe.
Do not force.
5. Install top cover.
LBL2284 REV -
TO TURN OFF GAS TO APPLIANCE
OPERATING INSTRUCTIONS

User’s Information Manual
10
4 SMART SYSTEM control module
• Hold 5 seconds to enter code
Input Mode (Menu Mode)
• Press to move up one level
in Menu Mode or to exit
Menu Mode
• Press to turn boiler off or
back on
• Press to select a menu item
• Press after parameter programming
to store parameter data
• Press to exit Service Mode
• Press to toggle display during normal
operation to show outlet and return
temperatures, fan speed, and flame
signal
• Press to toggle between digits when
entering access code or between hour,
minutes, etc., when entering date and
time
• Press to change boiler water
temperature set point during
normal operation
• Press to change displayed data
values in Menu Mode
• Press to navigate through menu
listing in Menu Mode
DISPLAY SCREEN
MENU / EXIT
SHUTDOWN
ENTER / RESET
SERVICE
BUTTON
PC
CONNECTION
PORT
NEXT
PREVIOUS
DOWNUP
Figure 4-1 Control Panel
Knight XL control module
Use the control panel (FIG. 4-1) to set temperatures, operating conditions, and monitor boiler operation.

User’s Information Manual
11
Access modes
User
The user can adjust space heating target temperature by using
the UP and DOWN buttons (FIG. 4-1) at any time during
normal operation. By entering the USER code (0704), the
user can also change temperature units, time and date, and
night setback settings. In User Mode, the following
parameters can be viewed but not changed:
• Boiler outlet water target temperature in DHW
Mode
• Boiler model number
• Software version
• Total operating hours
• Total cycles
Installer
Most parameters are available only to the installer, accessible
only by entering the installer access code. Have your qualified
service technician reference the Knight XL Service Manual.
Saving parameters (reference parameter table on
page 12 of this manual)
To save parameters and exit programming:
Press the ENTER/RESET button (FIG. 4-1).
To keep parameter settings only for a current operating
cycle:
Press the MENU/EXIT button (FIG. 4-1) 3 times after
making all desired parameter changes.
To enter a parameter and continue programming:
Press the MENU/EXIT button 1 time to return to the
parameter listings; press again to return to the menu listings.
Remember to press the ENTER/RESET button when finished
programming in order to save the changes made.
Have your qualified service technician reference the Knight
XL Service Manual for a detailed description of parameters
and access modes.
4 SMART SYSTEM control module (continued)

User’s Information Manual
12
4 SMART SYSTEM control module
Parameter table
MENU SUB ITEM DESCRIPTION SEE
PAGE
USER ACCESS INSTALLER ACCESS
DISPLAY MODIFY DISPLAY MODIFY
A
1Boiler Model 13 Yes No Yes No
2User Code 13 Yes Yes Ye s Ye s
3Date and Time 13 Yes Yes Ye s Ye s
4Software Version 13 Yes No Yes No
5Temperature Units 13 Yes Yes Ye s Ye s
6Night Setback Temperature 13 Yes Yes Ye s Ye s
7Night Setback Times 13 Yes Yes Ye s Ye s
B1SH Set Point User 13 Yes Yes Yes Yes
F
5Outdoor Air Shutdown 14 Yes Yes Yes Ye s
6Outdoor Air Shutdown
Differential 14 Yes Ye s Ye s Yes
8Boost Temperature 14 Yes Yes Yes Ye s
9Boost Time 14 Yes Yes Yes Ye s
OUTDOOR AIR
DHW
SETTINGS
DATA
LOGGING
TEMPERATURE
SETTING GENERAL
RESET
C
1Hours Running SH 13 Yes No Yes No
2Hours Running DHW 13 Yes No Yes No
3Ignition Attempts 13 Yes No Yes No
4Show Last 10 Errors 13 Yes No Ye s No
E
1DHW Boiler Set Point 14 Yes Yes Yes Yes
2SH/DHW Switching Time 14 Yes Yes Yes Yes
3DHW Tank Set Point 14 Yes Yes Yes Yes

User’s Information Manual
13
A: General
Boiler model
The control will display “Knight Boiler” as the model number
because the same control is used on several models. This will
be displayed when parameter A1 has been accessed. This
parameter is not changeable.
User code
The User Code allows the user to access and change a limited
number of control parameters. The access code can be
changed by the user or the installer to a code of their
choosing. To change the code, parameter A2 must be
accessed. The default code is 0704. The code can be changed
one digit at a time by using the arrow keys on the display.
Date and time
The control uses an internal clock for the night setback
feature and for logging of events. For these features to work
correctly, the clock must be set when the boiler is first
installed or anytime the boiler has been powered off for more
than 30 days. To set the clock, parameter A3 must be
accessed. The date and time are displayed as “YY:MM:DD W
hh:mm”. YY = year, MM = month, DD = date, W = day (1 =
Sunday, 2 = Monday, etc.), hh = hour (24 hour time;
2:00 PM = 14:00), mm = minutes.
Night setback times
If parameter A6 is set to anything other than 32°F (0°C), the
night setback feature becomes active. This will require start
and stop times to be programmed for the days that reduced
temperatures are required. These times can be changed by
the user or the installer by accessing parameter A7. Each day
of the week (Sunday through Saturday) will have an on and
off time.
Example: Monday ON: 22:30, Tuesday OFF: 6:45. If you
wish to skip a day and have no night setback, leave the on and
off times the same. The default times for each day will be
00:00 (midnight).
B: Temperature settings
SH set point user
The SH set point user sets the water temperature set point for
fixed operation or the maximum temperature set point when
the outdoor air sensor is used. This parameter can be
changed by the user or the installer by accessing parameter
B1. The temperature range of this parameter is 50°F (10°C)
to 190°F (88°C). The default value is 125°F (52°C).
C: Data logging
Hours running SH
The hours running SH parameter shows the total number of
hours the boiler has been in the SH firing position. This
parameter can be viewed by the user and the installer by
accessing parameter C1.
Hours running DHW
The hours running DHW parameter shows the total number
of hours the boiler has been in the DHW firing position. This
parameter can be viewed by the user and the installer by
accessing parameter C2.
Ignition attempts
The ignition attempts parameter shows the total number of
times the boiler has attempted to fire. This parameter can be
viewed by the user and the installer by accessing parameter
C3.
Show last 10 errors
The control will log the 10 most current errors with the date
and time the error occurred. This parameter can be viewed
by the user and the installer by accessing parameter C4.
NOTICE The internal clock does not adjust for
Daylight Savings Time and therefore,
will require a manual adjustment.
Software version
The software version allows the user to view the software
version in use by the control. This software controls the
operation of the boiler. When a new software version
becomes available, the existing control can be replaced with a
new control to update the software.
Temperature units
The control can be configured to display temperature in
either °C or °F. This parameter can be changed by the user or
the installer by accessing parameter A5. The default is °F.
Night setback temperature
Once the internal clock has been set correctly, the night
setback feature can be used to program a lower water
temperature set point for space heating. This parameter can
be changed by the user or the installer by accessing parameter
A6. The temperature range for this parameter is 32°F (0°C)
to 140°F (60°C). The feature is turned off with a setting of
32°F (0°C). The default value is 32°F (0°C).
4 SMART SYSTEM control module (continued)

User’s Information Manual
14
4 SMART SYSTEM control module
E: DHW settings
DHW boiler set point
When a DHW call for heat becomes active, the control will use
the DHW boiler set point to determine the firing rate of the
boiler based on the actual water temperature. This parameter
can be changed by the installer by accessing parameter E1. The
temperature range of this parameter is 50°F (10°C) to 190°F
(88°C). The default value is 180°F (82°C).
SH/DHW switching time
The SH/DHW switching time parameter sets the length of time
the control will stay in DHW Mode when a SH call has been
received. After this time period has expired the control will
revert to SH Mode. If a DHW call is still active the timer will
reset. After the time period has expired the control will revert
back to DHW Mode. This will continue until one of the
demands has been satisfied. This parameter can be changed by
the installer by accessing parameter E2. The time range of this
parameter is 10 minutes to 240 minutes. The default value is 30
minutes.
DHW tank set point
By installing a tank sensor, the SMART SYSTEM control can
perform the tank thermostat function. The SMART SYSTEM
control automatically detects the presence of this sensor, and
generates a DHW call for heat when the tank temperature
drops 6°F (3.5°C) below the tank set point, and finishes the call
for heat when the tank temperature goes 4°F (2°C) above the
tank set point. This parameter can be changed by the installer
by accessing parameter E3. The temperature range of this
parameter is 32°F (0°C) to 212°F (100°C). The default value is
125°F (52°C).
F: Outdoor air reset
Outdoor air shutdown
When the outdoor temperature rises above this point, the
control will block all SH demands (DHW demands will still be
active). This parameter can be changed by the user or the
installer by accessing parameter F5. The temperature range of
this parameter is 0°F (-18°C) to 120°F (49°C). The default value
is 70°F (21°C).
Outdoor air shutdown differential
The outdoor air shutdown differential parameter is the number
of degrees below parameter F5 the outdoor air temperature
must go before the boiler will respond to a SH demand. This
parameter can be changed by the user or the installer by
accessing parameter F6. The temperature range of this
parameter is 0°F (0°) to 90°F (50°C). The default value is 10°F
(5°C).
Boost temperature
If a SH demand lasts longer than the programmed time delay
setting (F9) and there have been no DHW demands, the control
will increase the water temperature set point by the amount in
this parameter. If the SH demand continues through another
time period, the set point will be increased again. This will
continue until either the SH demand ends, a maximum of 20
increases has occurred, or the maximum set point has been
reached. Once the SH demand has been satisfied the set point
will revert back to its calculated setting. The boost temperature
can be changed by the installer by accessing parameter F8. The
temperature range of this parameter is 0°F (0°C) to 45°F (25°C).
The default value is 0°F (0°C). This feature will be active if this
parameter is set to anything other than 0°F (0°C).
Boost time
The boost time parameter sets the amount of time that must
elapse with a SH demand before the water temperature set point
will be increased. This parameter can be changed by the
installer by accessing parameter F9. The time range for this
parameter is 1 minute to 60 minutes. The default value is 20
minutes.

User’s Information Manual
15
Status Display Screens
By using the Previous/Next (, ) arrow keys on the SMART SYSTEM display panel, you can navigate through the eight (8)
display screens. Each screen will contain two (2) viewable items. The following is a description of the individual items and
what they can display:
Screen Display shows: Description
#1
BLR: OFF The unit has been turned OFF by the Enter/Reset button on the
SMART SYSTEM display panel.
Standby The unit has not received a call for heat from a remote thermostat
nor has it received a call for heat from a DHW thermostat.
Set Point Met
The unit has met the water temperature set point, but is still
receiving a call for heat from either a remote thermostat or a DHW
thermostat.
Prepurge
The unit has initiated a 10 second purge period on a call for heat.
Note: On the 800 model the unit will initiate a 20 second purge
period on a call for heat.
Ignition The unit has begun a 5 second spark period to ignite the main
burner.
SH***% Rate The unit has fired and is running at the displayed percentage.
Postpurge
The call for heat has been satisfied and the unit runs the fan for an
additional 10 seconds to clear the combustion chamber and vent
system of residual flue products.
Service The unit has been placed in a temporary mode that will allow the
unit to fire at 100% of rate for the purpose of combustion analysis.
OUT: ***.*F(***)
When the outlet sensor has been selected as the control sensor
(default), the control will display the outlet temperature as well as
the set point in parenthesis.
***.*F If the outlet sensor has not been selected as the control sensor, only
the outlet temperature will be displayed.
Open The control does not detect the outlet sensor.
Shorted The outlet sensor wires or the sensor itself has become shorted.
Press the Next arrow key on the SMART SYSTEM display to access Screen #2.
#2
IN: ***.*F If the inlet sensor has not been selected as the control sensor, only
the inlet temperature will be displayed.
***.*F (***)
When the inlet sensor has been selected as the control sensor, the
control will display the inlet temperature as well as the set point in
parenthesis.
Open The control does not detect the inlet sensor.
Shorted The inlet sensor wires or the sensor itself has become shorted.
RISE: ***.*F The difference between the inlet temperature and the outlet
temperature.
Press the Next arrow key on the SMART SYSTEM display to access Screen #3.
4 SMART SYSTEM control module (continued)

User’s Information Manual
16
4 SMART SYSTEM control module
Status Display Screens (cont’d)
By using the Previous/Next (, ) arrow keys on the SMART SYSTEM display panel, you can navigate through the eight (8)
display screens. Each screen will contain two (2) viewable items. The following is a description of the individual items and what
they can display:
Screen Display shows: Description
#3
SYS: ***.*F If the system supply sensor has not been selected as the control sensor,
only the system temperature will be displayed.
***.*F (***)
When the system supply sensor has been selected as the control sensor,
the control will display the system temperature as well as the set point
in parenthesis.
Open The control does not detect the system supply sensor.
Shorted The system supply sensor wires or the sensor itself has become
grounded.
OUTDOOR: ***.*F The control will display the outdoor air temperature as sensed by the
outdoor air sensor.
Open The control does not detect the outdoor air sensor.
Shorted The outdoor air sensor wires or the sensor itself has become shorted.
Press the Next arrow key on the SMART SYSTEM display to access Screen #4.
#4
FLUE: ***.*F The control will display the flue temperature.
Open The control does not detect the flue sensor.
Shorted The flue sensor wires or the sensor itself has become shorted.
AUX: ***.*F The control will display the temperature.
Open The control does not detect the auxiliary sensor.
Shorted The auxiliary sensor wires or the sensor itself has become shorted.
Press the Next arrow key on the SMART SYSTEM display to access Screen #5.
#5 FAN SPD: ****RPM The control will display the actual fan motor RPM.
FLAME SIG: **.*uA The control will display the flame signal in dc microamps.
Press the Next arrow key on the SMART SYSTEM display to access Screen #6.
#6
SH CFH: OFF The control has not received a call for heat from a remote thermostat.
ON The control has received a call for heat from a remote thermostat.
DHW CFH: OFF The control has not received a call for heat from a SH remote
thermostat.
ON The control has received a call for heat from a DHW thermostat.
Press the Next arrow key on the SMART SYSTEM display to access Screen #7.

User’s Information Manual
17
Status Display Screens (cont’d)
By using the Previous/Next (, ) arrow keys on the SMART SYSTEM display panel, you can navigate through the eight (8)
display screens. Each screen will contain two (2) viewable items. The following is a description of the individual items and
what they can display:
Screen Display shows: Description
#7
DHW PUMP: OFF The control has not received a DHW call for heat and has not
powered the DHW pump.
ON The control has received a DHW call for heat and has powered the
DHW pump.
Delay The DHW call for heat has been satisfied and the DHW pump is
running for a fixed time to remove any residual heat.
0-10V IN: **.Vdc The control will display a 0-10Vdc signal received from a Building
Management System (BMS) connected to the unit.
Press the Next arrow key on the SMART SYSTEM display to access Screen #8.
#8
SYS PUMP: OFF The control has not received a call for heat from a remote thermostat
and has not powered the system pump.
ON The control has received a call for heat from a remote thermostat
and has powered the system pump.
Delay The system call for heat has been satisfied and the system pump is
running for a fixed time to remove any residual heat.
BLR PUMP: OFF
The control has either not received a call for heat from a remote
thermostat, a remote thermostat is not connected to the unit and the
water temperature has not dropped below the temperature set point
of the control to initiate a call for heat, or the control has received a
DHW call for heat from a DHW thermostat.
ON
The control has received a call for heat from a remote thermostat or
a remote thermostat is not connected and the water temperature has
dropped below the temperature set point of the control to initiate a
call for heat.
Delay The call for heat has been satisfied and the boiler pump is running
for a fixed time to remove any residual heat.
Press the Next arrow key on the SMART SYSTEM display to access Screen #9.
4 SMART SYSTEM control module (continued)

User’s Information Manual
18
4 SMART SYSTEM control module
Status Display Screens (cont’d)
Operation of the cascade
The boiler designated as the Leader will have two additional display screens that can be viewed. These screens will provide
information regarding the operation of the Cascade. Each screen will contain two viewable items. The following is a description
of the individual items and what they can display:
Screen Display shows: Description
#9
Cas: Off The Leader control has been turned off by the Enter/Reset button on
the Smart System display.
Cas: Standby The Leader boiler has not received a call for heat from a remote
thermostat.
Cas: 127.4F (130) The Cascade is now active. The system supply temperature will be
displayed. The Cascade set point will be displayed in parenthesis.
Cas: Setpoint Met The Cascade has met the water temperature set point, but is still
receiving a call for heat from a remote thermostat.
Cas: No Members The Leader control could not detect any Member controls to
participate in the Cascade.
Cas: S6 Not Present The system supply sensor is not connected to the Leader boiler.
PMP: Off The Leader control has not received a call for heat from a remote
thermostat and has not powered the system pump.
PMP: On The Leader control has received a call for heat from a remote
thermostat and has powered the system pump.
PMP: Delay The system call for heat has been satisfied and the system pump is
running for a fixed time to remove any residual heat.
Press the Next arrow key on the SMART SYSTEM display to access Screen #10.
#10
Cas Pow: ***% ***%
The first percentage shows the firing rate that is being sent to the last
boiler called on. The second percentage shows the total power available
to the Cascade.
Present: 01234567
Example:
Present: 23----d1
Shows the number of boilers connected to the Cascade. The Leader is
designated as 0. Members will be designated 1 - 7. If a “-“ is used in
place of a number, that boiler is either not connected, or in a lockout
mode and not available for the Cascade. If a “d” is used in place of a
number, that boiler is handling a DHW demand and is not available for
the Cascade. If the number is flashing, then that boiler is providing heat
to the Cascade. As the lead boiler is changed from day to day, that
boiler’s address will be shown first in the string of numbers. In the
example, boilers 0 - 3 are present, boiler 2 is the lead boiler, and boiler
0 is heating an indirect DHW tank.
Press the Next arrow key on the SMART SYSTEM display to roll back to Screen #1. At any point if you wish to access an earlier
screen, press the Previous arrow key on the SMART SYSTEM display.

User’s Information Manual
19
Notes

Revision Notes: Revision B (KBX-USER-Rev B) reflects changes
made to the “Check Air Piping” section on page 6.
Revision C (ECO #C02545) reflects the addition of references to
periodic cleaning of screens in vent terminations.
Revision D (ECO #C02940) reflects the addition of (C to denote
Celisius) after 10 under SH Set Point User (pg. 13).
Revision E (ECO #CO3296) reflects updates made to the condensate
trap image (FIG. 2-1) on page 7.
Revision F (ECO C05672) reflects the change from automatic air vent
to manual air vent. The chart on page 5 was updated and a new image
of the air vent valve was inserted on page 8 (FIG. 3).
KBX-USER Rev F
5/10