Designer Guide

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LOCHINVAR, LLC
300 MADDOX SIMPSON PKWY
LEBANON, TN 37090
www.lochinvar.com
Designer’s Guide / Knight XL Boiler
Run Time Contacts
The Smart System control will “make” these dry contacts for the duration of the Main
Burner.
System Supply Sensor
A sensor to be mounted in the supply line of the primary system loop. When the Smart
System is programmed to operate off the outlet sensor (default setting), and the system
supply sensor is connected, it will control the firing rate based on this sensor. This
sensor should always be installed, even when inlet temperature control is programmed
for control.
Outdoor Air Reset with Outdoor Sensor
A sensor mounted outside the building. The Smart System control will adjust system
temperature based on this sensor.
SMART SYSTEM OPERATIONAL FEATURES
The following is a list of just a few of the many other operational features built-in to the Smart
System control. For the complete list of features with more detailed explanations plus
programming parameters, refer to the Installation & Operation Manual, the Service Manual or the
User Manual.
Time Clock Freeze Protection
Anti-Cycling Night Setback
Service Reminder DHW Priority
Open / Shorted Sensor Detection Monitoring of Safety Devices
Fan Speed Low & Fan Speed High Ramp Delay
Flame Current Support Run Time and Cycle Count
Flue Temperature Limiting Temperature Rise Limiting
Outlet Temperature Limiting Gradient Limiting
DHW versus SH Cycling High Limit Operation
Low Voltage Blocking Low Water Cutoff Protection
MODBUS COMMUNICATION
The Knight XL boiler can communicate with Building Automation Systems (BAS) via Modbus
protocol. Modbus is one of several equipment “languages” that connect the operation of an
appliance to the BAS system. Functions as diverse as lighting, fire protection and climate control
are now tied to a central location and cooperative operation.
Via Modbus the Knight XL boiler can communicate up to 49 different datapoints, 9 of which can
be controlled by the BAS system. The BAS system and its programmers can manage the boiler
operation and get back specific details of the operation.
In addition, Lochinvar has gateway devices. The building integration manager may have chosen
BACnet or LonWorks for BAS system. The gateways can “translate” the Modbus protocol to
BACnet or LonWorks protocols that the BAS requires.
DRAW THE SENSORS AND THE SENSOR LOCATIONS INTO YOUR BUILDING AND PIPING PLANS.
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