Download Literature - Inside Look

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Field Connection Provisions
The KNIGHT Heating Boiler’s field wiring connections are extensive. The user friendly terminal strip
provided with all KNIGHT Heating Boilers allows for 28 points of low voltage field connections. These
connections may be additional safeties or accessories. The KNIGHT Heating Boiler also provides for
4 line voltage connections. Line voltage connections are for power supplied to the unit, and power
distribution for up to three pumps operated by the SMART SYSTEM Control.
Field Low Voltage Connections
A 24 VAC Pilot Supply- This will provide a 24 VAC signal during a call for heat.
This connection is commonly used to close a relay which in turn supplies power to
an auxiliary device such as a mechanical room fan.
Gas Pressure Switch- These connections allow for the addition of low or high
gas pressure safety switches, which are required in many areas of the country.
Flow Switch- Connection points used for flow sensing with a paddle type
flow switch.
Alarm Contacts- Provides a contact closure in the event of any failure to the unit.
Generally this would be connected to an audible alarm or BMS.
Runtime Contacts- Contact closure when unit is on.
R/W Tank Aquastat Connection- Allows for the connection
of a thermostat to control the DHW indirect tank.
LWCO Connection- Specialized connection point for the LWCO
provided by Lochinvar.
R/W Room Thermostat Connection- For room thermostat
or zone control installation.
System Sensor- Used for multiple boiler systems.
Tank/Auxiliary Sensor- The DHW tank sensor allows the Smart System
control to maintain the stored water temperature.
Outdoor Sensor- The outdoor air sensor, when connected, allows the boiler to
maintain a water temperature based on outdoor conditions. The SMART SYSTEM will
automatically detect when an outdoor air sensor is connected.
Cascade Sequencing These connections allow up to 8 individual units to be
“daisy chained” together to provide for sequenced operation under the control of a
single “leader” boiler.
0-10 VDC External Control- Allows the contractor to tie an external temperature
control such as a sequencer or Building Management System to the boiler to control
modulation rate or temperature set point.
Field Line High Voltage Connections
Boiler Pump- This connection must be used to provide 120 VAC to the pump provided
with the KNIGHT Heating Boiler.
System Pump- The KNIGHT Heating Boiler performs optimally when installed in a
primary/secondary piping arrangement. With primary/secondary, a system pump is required.
DHW Pump- When installed and connected to a domestic hot water prioritization
arrangement, these contacts are used to start and stop the pump moving hot water through
an indirect tank.
120 VAC Supply- This connection is the power supply to the boiler. Always install the
electrical supply to the KNIGHT Heating Boiler in a hard wired configuration. Never use
extension cords to supply power.
Lochinvar Corporation • 300 Maddox Simpson Pkwy • Lebanon, TN 37090 • 615-889-8900 / Fax: 615-547-1000
www.Lochinvar.com • www.knightheatingboiler.com
KBI-05
(Reprint KBI-04 5/07)
2/08-Printed in U.S.A.