H IG H E F FICIE NCY COMM ERCIAL COND ENSING B OILE R S
PERATING CONTROL FETURING
A BUILT-IN CASCADING SEQUENCER
5 MODELS: 399,000 – 800,000 BTU/HR
FIRING RATE MODULATION TO 5:1
LESS THAN 20 ppm NOx
DIRECT-VENT FLEXIBILITY TO 100 FEET
Up to 94.6%
Thermal Efficiency
lochinvar.com
The Brain
Brilliant erformance
SMART SYSTEM provides unequalled control
and monitoring functions that are easy to
understand and use.
2-Line, 16-Character LCD Display
Setup and diagnostic information in words, not codes
Password Security
Dual password levels for installer and user
Building Management System Control (0 – 10 V)
BMS-driven input for control of modulation rate or temperature
PC Connection
Can be used with KNIGHT XL PC software to program and
troubleshoot SMART SYSTEM functions, and to track historical
data, including faults, trends and energy consumption
Outdoor Reset
Outdoor temperature monitor guides the reset schedule to meet
heat loss/load of the building
Night Setback
Program a setback for any time of the day, each day of the week
System Pump Control and Boiler Pump Control
Switching contacts control power to both system and boiler
pumps on a call for heat. Programmable pump delay orders
pumps to operate after a call has been satisfied
Pump Relay with Freeze Protection
Ensures water temperature does not fall below 40°F
Hot Water Generator Compatibility
One boiler in a sequence can be assigned for Domestic Hot Water
Prioritization (DHWP) to meet domestic water demand
15-1/2”
zero clearance
to combustibles
Inlet/Outlet and System Temperature Sensors
Installer can select which sensor controls the setpoint
Low Water Flow Indicator
Protects against high temperature differential in the heat
exchanger with reduced firing rate or shutdown
The 4-unit installation shown illustrates
the space-saving KNIGHT XL footprint,
and the ease and versatility of the
two-pipe direct-vent design.
Product Service Indicator
Program reminders for cycle count, operation hours or last service
Field Connection Versatility
User-friendly terminal strip allows for 28 low-voltage field
connections. Plus 4 line voltage connections supply power to
the unit, and up to 3 pumps operated by the SMART SYSTEM
a Built-in
Cascading
Sequencer!
In commercial buildings requiring a multiple boiler system, modulating
operation of individual units should be sequenced so that the system
functions as an integrated whole.
SMART SYSTEM includes a built-in cascading sequencer for up to 8
KNIGHT XL units. This eliminates the initial cost and labor required
with installation of a separate sequencer. And, because it’s engineered
specifically for Lochinvar boilers, it removes any uncertainty about
using a ”third-party” sequencer, to ensure precise, dependable
cascading operation.
When utilizing the built-in cascading sequencer, KNIGHT XL boilers
communicate through a simple 2-wire daisy chain connection. On
demand, one boiler in the system functions as the leader, and
modulates with demand to capacity. The additional load then
”cascades” to the second boiler, which fires and modulates to meet
added demand via a patented process to match system load and
reduce equipment short cycling.
Cascading continues as additional boilers fire in sequenceuntil all
units are in operation or demand is satisfied. When demand drops,
the patented cascading process reverses, with the precision, control
and performance you expect from Lochinvar.
SMART SYSTEM also controls Lead-Lag Rotation. Every 24 hours the
lead boiler role is shifted to the next unit in the sequence. This rotation
ensures long life by distributing ”lead-lag” runtimes equally over each
unit in the system.
Easy Handling
on the Jobsite
Because of its compact design and stainless steel heat
exchanger, KNIGHT XL boilers are remarkably lightweight
and easy to handle on the jobsite.
Direct-Venting
up to 100 Feet
KNIGHT XL offers tremendous flexibility for placement of
units within the building, because it permits direct-vent
air intake and exhaust runs up to 100 equivalent feet
using either PVC, CPVC or AL29-4C stainless steel vent
pipe. Intake and exhaust runs can terminate horizontally
through a sidewall or vertically through the roof.
Easy Access to
Internal Components
The front and top panels of the KNIGHT XL boiler can be
quickly removed without any tools. This provides fast,
easy access to internal components and electrical
connections during installation and service.
®
Knight XL Boiler Dimensions and Specifications
LOW VOLTAGE
ELECTRICAL
CONNECTIONS
K
HIGH VOLTAGE
ELECTRICAL
CONNECTIONS
Model Number Guide
700 M13
GAS
AIR INLET
KB
N
J
HEAT
EXCHANGER
DRAIN
INLET
OUTLET
3/4" NPT
A
FLUE
Knight XL Boiler,
38-3/4"
39-1/2"
I
CONDENSATE
DRAIN
Natural Gas,
H
FLUE
700,000 Btu/hr input,
18-3/4"
M13 firing controls
13-3/4"
3-1/2"
9"
1/4" - 1-1/4"
8"
G
F
ADJUSTABLE
B
E
FRONT
D
C
BACK
LEFT SIDE
K
Gas Water Air Vent Shipping
Conn. Conn. Inlet Size Wt. (lbs.)
42-1/2” 15-1/2”
42-1/2” 15-1/2”
42-1/2” 15-1/2”
42-1/2” 15-1/2”
42-1/2” 15-1/2”
27-3/4” 3-3/4” 20-3/4” 21”
31-1/4” 3-3/4” 25-1/2” 21”
14”
14”
14”
17”
17”
34”
34”
2”
2”
18-3/4” 1”
18” 1”
1-1/2” 4”
1-1/2” 4”
4”
4”
4”
6”
6”
280
310
340
370
405
KBN399
KBN500
KBN600
KBN700
KBN800
80
399
500
600
700
800
93.3%
93.3%
94.6%
94.3%
94.0%
372
467
567
660
752
324
406
493
574
654
32-1/2” 36”
100
120
140
160
36-1/4” 3-3/4” 25”
40-1/4” 3-3/4” 29”
21”
23”
36”
36”
36”
32-3/4” 5-1/2” 19-1/2” 1”
32-3/4” 3-1/4” 23-1/2” 1”
32-3/4” 3-1/4” 27-3/4” 1”
2”
2”
2”
4”
4”
4”
45-1/4” 3-3/4” 33-1/4” 23”
Notes: Change ‘N’ to ‘L’ for L.P. Gas Model. No deration on L.P. models. Performance data based on manufacturer test results. 120 VAC /15 AMP circuit required.
All dimensions shown in inches.
Standard Features
Smart System Features
> Low Voltage Terminal Strip
> 24 VAC Auxiliary Device Relay
> Auxiliary Proving Switch Contacts
> Flow Switch Contacts
> Alarm on Any Failure Contacts
> Runtime Contacts
> DHW Thermostat Contacts
> Room Thermostat Contacts
> System Sensor Contacts
> DHW Tank Sensor Contacts
> Outdoor Air Sensor Contacts
> Cascade Contacts
> Up to 94.6% Thermal Efficiency
> Modulating Burner with 5:1 Turndown
> Direct-Spark Ignition
> SMART SYSTEM Digital Operating Control
> 2 line, 16 Character Display
> Dual Level Password Security
> Domestic Hot Water Prioritization
> Built in Cascading Sequencer for up to 8 Boilers
> Low NOx Operation
> Sealed Combustion
> Building Management System Integration
> Low Gas Pressure Operation
> Vertical & Horizontal Direct-Vent
> Category IV venting up to 100 feet
> PVC, CPVC or AL29-4C Venting up to 100 Feet
> Factory Supplied Sidewall Vent Termination
> ASME Stainless Steel Heat Exchanger
> ASME Certified, ”H” Stamped
> Gasketless Heat Exchanger
> 160 psi Working Pressure
> Highly efficient, condensing design
> On/Off Switch
> Adjustable High Limit w/ Manual Reset
> Flow Switch
> Inlet & Outlet Temperature Sensors
> Flue Temperature Sensor
> Low Air Pressure Switch
> 50 psi ASME Relief Valve
> Temperature & Pressure Gauge
> Adjustable Leveling Legs
with 0-10 VDC Input
> Outdoor Reset Control with Outdoor Air Sensor
> Low Water Flow Safety Control & Indication
> Inlet & Outlet Temperature Readout
> Freeze Protection
> Service Reminder
> Time Clock
> Data Logging
> Hours Running, Space Heating
> Hours Running, Domestic Hot Water
> Ignition Attempts
> Last 10 Lockouts
> Programmable System Efficiency Optimizers
> Night Setback
> Anti-Cycling
> Outdoor Air Reset Curve
> Ramp Delay
> Boost Temperature & Time
> Three Pump Control
> System Pump
> Boiler Pump
> Domestic Hot Water Pump
> High Voltage Terminal Strip
> 120 VAC / 50-60 Hertz / 1 Phase Power Supply
> Three sets of Pump Contacts with Pump Relays
> 0-10 VDC BMS External Control Contact
Optional Equipment
> Alarm Bell on Any Failure
> Condensate Neutralization Kit
> High & Low Gas Pressure Switches w/ Manual
Reset (KB500-KB800)
> Low Water Cutoff w/Manual Reset & Test
> SMART SYSTEM PC Software
> Stainless Steel Vent Kits (KB700-KB800)
> Multi-Stack Frame
Firing Codes
> Condensate Trap
> Zero Clearances to Combustible Material
> 10 Year Limited Warranty
> M9
> M7
> M13
Standard Construction
California Code
CSD1 / FM / GE Gap (KB500-KB800)
(See Warranty for Details)
Patent # 7,506,617
300 Maddox Simpson Parkway, Lebanon, TN 37090
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615 -889 - 8900
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fax: 615 -547- 1000
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w w w.lochinvar.com
5M-4/09-Printed in U.S.A.
KBX-03 (Replaces KBX-02 6/08)
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