Lochinvar KNIGHT KBN081 User manual

95%
AFUE Efficiency
knightheatingboiler.com
CONDENSING RESIDENTIAL GAS BOILERS
CONTROL WITH ADVANCED
USER FEATURES
MODELS FROM 80,000 TO 285,000 BTU/HR
5:1 FIRING RATE MODULATION
LESS THAN 20 ppm NOx
DIRECT VENT FLEXIBILITY TO 100 FEET
UP TO 98% EFFICIENCY IN LOW TEMP
APPLICATIONS

HEATING BOILERS
HEATING BOILERS
KNIGHT is recognized for its reliable, proven performance and high quality standards. Its award winning design assures contractors
and home owners peace of mind and long term savings in operating costs.
Lochinvar has raised the KNIGHT standard to even greater heights. The SMART SYSTEM™control with color display gives installers
and maintenance personnel a greater level of control than ever before. It's easy to access all the information they need to setup,
troubleshoot and monitor all boiler functions. Additionally, two cascading options allow the installer to fine-tune sequencing of
multiple boiler installations.
More than ever, KNIGHT is the best choice for traditional hydronic space heating, radiant floor heating and indirect domestic hot
water applications.
The Best You Can Buy Is Now Even Better!
All KNIGHT Boilers meet or
exceed the most stringent
requirements, with less
than 20 ppm NOx.
The KNIGHT Boiler has been
designated as one of the
Most Efficient ENERGY STAR
qualified products in 2012.
Knight XL Commercial
Need more BTU's? KNIGHT XL Commercial Boilers are available
in 5 sizes from 399,999 to 800,000 Btu/hr. See KNIGHT XL
literature for more details.
Floor Standing Models
The KNIGHT Floor-Standing lineup features
5 small footprint models from 80,000 to
285,000 Btu/hr.
95% DOE AFUE Efficiency
*Wall-Mounted Fire Tube
Models Available
7 Inputs from 55,000 to 399,999 Btu/hr.
See Knight Wall Mount Literature (WHN)
for more details.

Lead-Lag Cascade
The “lead” boiler modulates with demand to capacity. As demand
increases, additional boilers fire and modulate to capacity. This
continues, with additional boilers firing and modulating to capacity
until all units are operating. Every 24 hours, the SMART SYSTEM
automatically shifts the lead boiler role to the next in the sequence,
distributing lead-lag runtimes equally.
Efficiency Optimized Cascade
This feature optimizes the modulation capabilities of the Boiler Plant
while evenly distributing run time across all cascaded boilers. Every 24
hours the SMART SYSTEM automatically shifts the 1st boiler on role to
the next in the sequence, distributing run time equally.
SMART SYSTEM Cascade option allows 2 - 8 boilers to be sequenced.
Selectable Cascade Options
When multiple KNIGHT boilers are installed together, the SMART SYSTEM built-in sequencer can
be set for “Lead-Lag” cascade or “Efficiency Optimized” cascade operation.
At-a-Glance Color-Coding
The SMART SYSTEM™is the most advanced
integrated boiler control on the market today.
Larger LCD Screen
Displays more information.
Soft Keys
For simple programming.
Navigation Dial
For fast transitions from screen to screen
and easy adjustment of settings.
USB Port
USB port permits connection to a laptop computer. SMART SYSTEM PC
software may be used to troubleshoot and program KNIGHT®functions,
set date and time, monitor historical data, including faults, trends and
energy consumption.
Puts More Control
and Information at Your Fingertips
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Yellow Screen
Maintenance due - shows
the installer’s name and
number on the display.
Blue Screen
Normal system
operation.
Red Screen
Lockout mode - shows
active fault and
installer's name and
number on the display.

*Optional kit allows for an attractive sidewall
termination when using PVC, CPVC or polypropylene vent material.
Optional
Sidewall Vent
Termination
* Exclusive feature, available only from Lochinvar
5 Flexible Options for Direct-Venting up to 100 Feet!
Placement of units within a building will never be a problem with KNIGHT.
It permits up to 100 feet of air intake and 100 feet of exhaust vent with
PVC, CPVC, polypropylene or stainless steel pipe.
Direct-Vent Vertical Vertical with Sidewall Air Direct-Vent Vertical* Direct-Vent Sidewall* Direct-Vent Sidewall
NEW!
Compatibility with Copper Fin II
Non-Condensing Boiler
Allows you to create a front end loading system.
NEW!
Multiple Sized Boiler Cascade
Control
KNIGHTS of one or more sizes can be combined
into a single cascade to maximize turndown and
meet minimum demands.
* Internal Cascading Sequencer
with Multiple Programmable
System Efficiency Optimizers
Fine-tune installations using Lead-Lag or
Efficiency Optimization Cascade features.
* Controls up to Three
Setpoint Temperatures
Allows three different temperature inputs to
be controlled. Boiler can be run at the lowest
temperature demand for optimal efficiency.
* Outdoor Reset for Each Temp Loop
The boiler setpoint temperature responds to changes
in outdoor air temperature. Outdoor temperature
monitor guides the reset schedule to meet the load.
Night Setback
Program a heating loop temperature setback for
any time of the day, each day of the week.
Domestic Hot Water
Prioritization w/Pump Control
On DHW call, SMART SYSTEM overrides the
outdoor reset and starts the DHW pump to the
indirect water heater alternating to meet both
heating and hot water demands.
* DHW Night Setback
Resets DHW setpoint to save water-heating
energy during times of low or no usage.
* DHW Max Firing Rate
Allows you to limit the maximum percentage of
firing rate when in DHW mode.
* Separately Adjustable
SH/DHW Mode Switching Times
Allows controls to be tailored to meet system
demand. Design system setup for flexibility.
Indirect Water Heater
Zone Pump Control
All boilers in cascade can be used to meet DHW
demand as well as satisfy building load.
System & Boiler Pump Controls
Provides power to system and boiler pumps on
a call for heat. Programmable post purge allows
pumps to operate after a call has been satisfied.
Option for Continuous System Pump Operation.
* Pump Relay with
Freeze Protection
Parameters adjustable by installer for flexibility in
low-temperature applications.
* Installer Access to
BMS and Ramp Delay Settings
Set up or change these parameters through the control
itself on the front of the boiler; no PC software required.
Low-Water Flow Indicator
Uses temperature differential to protect
against low flow in heat exchanger by reducing
modulation or forcing boiler shutdown.
Password Security
Allows only qualified personnel to access
parameters.
* Product Service Indicator
Program reminders for cycle count, operation
hours or last service. Installer's name and
number may be displayed.
Optional Modbus Capability
Allows boiler communication through Modbus
protocol. Simplifies BMS/boiler interface for
status monitoring.
0-10V Building Management
System (BMS) Control Input
BMS-driven input for modulation rate or
temperature control.
0-10V Cascade Setpoint
and Modulation Control
BMS-driven input for modulation rate or
temperature control of cascade.
0-10V Heat Demand Input
Enables thermostat or a 0-10V signal to initiate
a call for heat. Gives the BMS options on how to
enable boiler or cascade.
0-10V Boiler Rate Output
Signal output of modulation rate allows BMS to
monitor boiler firing rate.
0-10V Pump Signal Input
Input from variable speed system pump allows
faster reaction to changes of flow in system,
reducing possibility of temperature over-shoot
and cycling.
0-10V Signal to Control Variable
Speed Boiler Pump
Allows control to maintain a higher T at low
firing rates and reduces boiler flow when it
responds to lower flow rates in the system loop.
Dial in System Performance
*An optional concentric vent kit is sold separately to allow a single penetration for both combustion air and vent pipes.
Building
Management
Inputs & Outputs

Team KNIGHT with SQUIRE for
low-cost domestic hot water!
KNIGHT’s Domestic Hot Water Prioritization feature means
you can easily install it with Lochinvar’s SQUIRE®indirect
water heater, available in 30, 40, 50, 65, 80 and 119
gallons. This combination will give homeowners high-
efficiency space heating from KNIGHT, and abundant
domestic hot water from SQUIRE. With a stainless steel
tank and heat exchanger, SQUIRE provides more hot water
and lower water heating costs than standard gas or electric
water heaters.
State-of-the-Art Modulating Combustion System
Advanced Negative Regulation Technology
KNIGHT safely and reliably operates with supply gas pressures as low as 4 inches water column. Plus “Neg/Reg” technology
automatically adjusts gas pressure to ensure the correct volume of fuel and air entering the burner.
Direct-Spark Ignition
With each call for heat, two electrodes ignite the fuel/air mixture. A third electrode
then senses for flame. The SMART SYSTEM will generate a soft lockout and
display a fault if ignition does not occur.
Fully Modulating Burner with 5:1 Turndown
The SMART SYSTEM allows fully modulating combustion with 5:1
turndown. The burner can fire as low as 20% of maximum input
and modulate the firing rate up to 100% as demand increases.
A woven stainless steel mesh enclosed burner tube fires in a 360°
pattern along the entire length of the primary heat exchanger.
Two-in-One Stainless Steel Heat Exchanger
A primary heat exchanger combined with a secondary heat exchanger
captures flue gas heat and condenses to utilize available latent
energy. The stainless steel, pH-tolerant design features a weld-sealed
assembly with no O-rings or gaskets and does not require special
glycol. ASME Section IV approved and stamped.
Field Connection Versatility
User-friendly terminal strip allows for 44 low-voltage field connections.
Four-line voltage connections supply power to the unit and up to three
pumps operated by the SMART SYSTEM.
UIRE for
ot water!
KNIGHT’s Domes
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c Hot Water Prioritization feature means
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correct volume of fuel and air entering the burner.
uel/air mixture. A third electrode
nerate a soft lockout and
rndown
ustion with 5:1
maximum input
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unit and up to three
KBN286 Shown
KBN286 Shown

Knight Heating Boiler
*Exclusive feature, available only from Lochinvar
Smart System™Features
>SMART SYSTEM Digital Operating Control
> Multi-Color Graphic LCD Display
with Navigation Dial and Soft Keys
> Three Setpoint Temperature Inputs
>Built-in Cascading Sequencer for up to 8 Boilers
> Cascade Multiple Sized Boilers
> Lead Lag
> Efficiency Optimization
> Front End Loading Capability with Copper Fin II
>Outdoor Reset Control with Outdoor Air Sensor
> Programmable for Three Reset Temperature Inputs
>Programmable System Efficiency Optimizers
> Night Setback w/Overide Function
> DHW Night Setback w/Overide Function
> Anti-Cycling
> Outdoor Air Reset Curve
> Ramp Delay
> Boost Temperature & Time
>Three Pump Control
> System Pump with Parameter for
Continuous Operation
> Boiler Pump with Variable Speed Pump Control*
> Domestic Hot Water Pump
>Domestic Hot Water Prioritization
> DHW tank piped with priority in the boiler loop
> DHW tank piped as a zone in the system with
the pumps controlled by the Smart System
> DHW Modulation Limiting
> Separately Adjustable SH/DHW Switching Times*
>Building Management System Integration
> 0-10VDC Input to Control Modulation or Set Point
> 0-10VDC Modulation Rate Output
> 0-10VDC Input Signal from Variable
Speed System Pump*
> 0-10VDC Input to Enable/Disable call for heat
>High-Voltage Terminal Strip
> 120 VAC / 60 Hertz / 1 Phase Power Supply
> Three Sets of Pump Contacts
>Low Voltage Terminal Strip
> 24 VAC Device Relay
> Proving Switch Contacts
> Flow Switch Contacts
> Alarm on Any Failure Contacts
> Runtime Contacts
> DHW Thermostat Contacts
> 3 Space Heat Thermostat Contacts
> System Sensor Contacts
> DHW Tank Sensor Contacts
> Outdoor Air Sensor Contacts
> Cascade Contacts
> 0-10VDC BMS External Control Contact
> 0-10VDC Boiler Rate Output Contacts
> 0-10VDC Variable Speed System Pump Signal Input
> 0-10VDC Signal to Control Variable
Speed Boiler Pump
> Modbus Contacts
>Time Clock
>Data Logging
> Hours Running, Space Heating
> Hours Running, Domestic Hot Water
> Ignition Attempts
> Last 10 Lockouts
>Access to BMS Settings through Graphic LCD Display
>Maintenance Reminder
> Custom Maintenance Reminder with Contractor Info
> Installer Ability to De-activate Service Reminder
>Low-Water Flow Safety Control & Indication
>Dual Level Password Security
> Customizable Freeze Protection Parameters
Standard Features
> ENERGY STAR Most Efficient Recognition
>95% DOE AFUE Efficiency
>Modulating Burner with 5:1 Turndown
> Direct-Spark Ignition
> Low-NOx Operation
> Field Convertible from Natural to LP Gas
> ASME Stainless Steel Heat Exchanger
> 30 psi ASME Relief Valve
> Vertical & Horizontal Direct-Vent
> PVC, CPVC, Polypropylene or SS Venting up to 100 feet
> Smart System Control
> Condensate Trap
> Other Features
> Automatic Reset High Limit
> Adjustable High Limit w/Manual Reset
> Boiler Circulating Pump
> Adjustable Leveling Legs
> Zero Clearances to Combustible Materials
> 12-Year Limited Warranty (See Warranty for Details)
Optional Equipment
> Modbus Communication
> Condensate Neutralization Kit
> Multi Temperature Loop Control
> Flow Switch
> Low-Water Cutoff w/Manual Reset & Test
> Alarm Bell
> Concentric Vent Kit
> SMART SYSTEM PC Software
> Stack Frame
>BMS Gateway to LON or BacNet
> Sidewall Vent Termination
Firing Codes
> M9 Standard Construction
> M7 California Code
KBN-09 (Replaces KBN-08 8/12) FG-10M-11/12 Printed in U.S.A.
Input Heating NET
Model Min. Max. AFUE Capacity I=B=R
Number MBH MBH % MBH MBH
KBN081 16 80 95.0 74 64
KBN106 21 105 95.0 97 84
KBN151 30 150 95.0 139 121
KBN211 42 210 95.0 196 170
KBN286 57 285 95.0 267 232
A C D E F G H I J K Gas Water Air Vent Shipping
Conn. Conn. Inlet Size Wt. (lbs.)
33-1/4"14"7"5-3/4"5"3"20-1/2"22"1-3/4"6-1/2"1/2"1"3" 3"125
33-1/4"14"6-1/2"5-3/4"4-1/2"1-1/2"20-1/2"22"1-3/4"6-1/2"1/2"1"3" 3"129
33-1/4"18"12-1/4"11-1/2"10"1-1/2"21-1/4"23"1-3/4"12"1/2"1"3"3"157
33-1/4"22-1/4"16-1/2"15-3/4"14-1/4"5-1/4"21-1/4"23"1-3/4"16-1/4"1/2"1"3"3" 172
42-1/4"19-3/4"12-3/4"13-1/2"6"2"34"31"11-3/4"4-1/4"3/4"1-1/4"4"4" 224
Notes: Indoor installation only. All information subject to change. Change "N" to "L" for LP gas models.
Net ratings based on piping and pick-up allowance of 1.15
Dimensions and Specifications
Models:
KBN 081-211
Model:
KBN286
Knight®
®Boiler Dimensions and Specifications - Floor-Standing Models
Patent Pending
Lochinvar, LLC
300 Maddox Simpson Parkway
Lebanon, Tennessee 37090
P: 615-889-8900 / F: 615-547-1000
www.Lochinvar.com