Designer Guide

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LOCHINVAR, LLC
300 MADDOX SIMPSON PKWY
LEBANON, TN 37090
www.lochinvar.com
Designer’s Guide / Knight XL Boiler
LOW VOLTAGE TERMINAL BOARD
Every Knight XL is equipped with a Low Voltage Terminal Board for a variety of field connections
and control features.
Alarm on Any Failure Contacts
Should the Smart System control detect a fault, it will send an alarm signal through these
dry contacts to a remote control board or activate an alarm bell.
Room Thermostat 1, 2 and 3
With an end switch wired to the Room Thermostat contacts, the Smart System control
can operate and meet the demand of up to three Space Heating zones.
DHW Mode or Tank Thermostat
The Smart System control will operate the DHW based on a signal from a tank sensor
with a resistance signal or a tank thermostat with an enable / disable signal.
0-10 VDC Boiler Pump Output Control
This signal modulates a Variable Speed Boiler pump in conjunction with the boiler’s firing
rate to keep a constant 20°F temperature rise across the boiler’s heat exchanger.
BMS Control with 0-10 vdc Input
The Smart System control can be controlled by a Building Management System with a 0-
10 Vdc signal. The signal can control either the setpoint or the modulation directly. It can
control a single boiler or multiple boilers through Cascade.
DHW Tank Sensor
A sensor mounted in the Domestic Water Storage tank. The Smart System will operate
the DHW from this sensor with DHW Limiting to reduce the boiler’s overall input to match
the heating capacity of the Indirect Water Heater.
Low Voltage Circuit Board