Designer Guide

35
LOCHINVAR, LLC
300 MADDOX SIMPSON PKWY
LEBANON, TN 37090
www.lochinvar.com
Designer’s Guide / Knight XL Boiler
Knight XL – the components, the design
1. Stainless steel heat exchanger
System water flows through specially designed coils for maximum heat transfer, while
providing protection against flue gas corrosion. The coils are encased in a jacket that
contains the combustion process.
2. Heat exchanger access cover
The cover allows access to the combustion side of the heat exchanger coils.
3. Blower
The blower pulls in air and gas through the venturi (item 5). Air and gas mix inside the
blower and are pushed into the burner, where they burn inside the combustion chamber.
4. Gas valve
The gas valve senses the negative pressure created by the blower, allowing gas to flow
only if the gas valve is powered and combustion air is flowing.
5. Venturi
The venturi controls air and gas flow into the burner.
6. Flue gas sensor
This sensor monitors the flue gas exit temperature. The control module will modulate and
shut down the boiler if the flue gas temperature gets too hot. This protects the flue pipe
from overheating.
7. Boiler outlet temperature sensor
This sensor monitors boiler outlet water temperature (system supply). If selected as the
controlling sensor, the control module adjusts boiler firing rate so the outlet temperature
is correct.
8. Boiler inlet temperature sensor
This sensor monitors return water temperature (system return). If selected as the
controlling sensor, the control module adjusts the boiler firing rate so the inlet
temperature is correct.
9. Temperature and pressure gauge (field installed, not shown)
The gauge monitors the outlet temperature of the boiler as well as the system water
pressure.
10. Electronic display
The electronic display is a liquid crystal display operated with soft key pads and a
navigation dial.
11. Flue pipe adapter
The adapter allows for the connection of the PVC vent pipe system to the boiler.
12. Burner (not shown)
Made with metal fiber and stainless steel construction, the burner uses pre-mixed air and
gas and provides a wide range of firing rates.
13. Water outlet (system supply)
A 1-1/2" or 2" NPT (depending on the model) water connection that supplies hot water to
the system.
14. Water inlet (system return)
A 1-1/2" or 2" NPT (depending on the model) water connection that returns water from
the system to the heat exchanger.
15. Gas connection pipe
1” NPT threaded pipe connection. This pipe should be connected to the incoming gas
supply for the purpose of delivering gas to the boiler.
16. SMART Control Module
The SMART Control responds to internal and external signals and controls the blower,
gas valve, and pumps to meet the heating demand.
17. Automatic air vent