Lochinvar
800
operation manual
Install
Diagrams
Alarm contacts
Delay
Connecting gas supply piping
Maintenance
Configuration of the cascade
Address reported problems
Access modes
Flow switch adjustment
Page 74
Notes
Page 73
Page 75
Image 74
Page 73
Page 75
Contents
Models 399
Save this manual for future reference
Contents
When servicing boiler
Please read before proceeding
Knight XL How it works
Air pressure switch Pump relay board
Model
Models 600
Ratings
Knight XL Boiler =B=R Rating
Determine boiler location
Installation must comply with
Closet and alcove installations
Before locating the boiler, check
For closet installations, Cpvc or
TOP
Vent and air piping
Residential garage installation
Provide air openings to room
Flooring and foundation
Areas likely to have contaminants
When using an existing vent system to install a new boiler
Products to avoid
When removing a boiler from existing common vent system
Model
Prepare boiler
Remove boiler from wood pallet
Gas conversions
Leveling the boiler
Models 600
General venting
Direct venting options Vertical Vent
Installing vent or air piping
Install vent and combustion air piping
Requirements for installation in Canada
General venting
Make
PVC/CPVC air intake/vent connections
Approved Stainless Steel Vent Manufacturers
Air inlet pipe materials
Stainless steel vent
FasNSeal Saf-T Vent
Stainless steel air intake/vent connections
Optional room air
Removing from existing vent
Model Description Kit Number
Air contamination
Vent/air termination sidewall
If using the alternate sidewall termination
Sidewall direct venting
Determine location
3AClearance to Gravity Air Inlets
Prepare wall penetrations
Bird Screen Typical
Termination and fittings
Prepare wall penetrations Alternate Field Supplied Option
Multiple vent/air terminations
Sidewall termination installation
Description and usage
9Concentric Vent Dimensional Drawing Models 399
11Concentric Vent Sidewall Attachment
Multiventing sidewall terminations
Vertical direct venting
Vent/air termination vertical
Prepare roof penetrations
2Vertical Terminations with Multiple Boilers
Vertical termination installation
4Concentric Vertical Termination
Multiventing vertical terminations
Mm see -9,
Hydronic piping
Hydronic piping
Circulator sizing
Flow switch adjustment
Near boiler piping connections
20F 25F 30F 35F
Head Feet
Pressure
399 500 600 700 800
Near boiler piping components
7Single Boiler Primary/Secondary Piping
Number of Units Model Manifold Pipe Sizes in Inches mm
Connecting gas supply piping
Gas connections
Natural gas
Propane Gas
Iron Pipe
Nominal Natural Gas Pipe Capacity Chart
Check inlet gas supply
Length of Pipe in Straight Feet
Gas valve replacement
Gas Pressure
Line voltage connections
Field wiring
Installation must comply with
High gas pressure switch
Outdoor temperature sensor
Auxiliary device proving switch
Low gas pressure switch
System supply sensor
Alarm contacts
Wiring of the cascade
Boiler management system
3Low Voltage Field Wiring Connections
Condensate disposal
Condensate drain
Check/control water chemistry
Freeze protection when used
Start-up
Fill and test water system
Inspect/fill condensate system
Check for gas leaks
Check thermostat circuits
Inspect/check condensate lines and fittings
If boiler does not start correctly
Final checks before starting the boiler
Start the boiler
Check system and boiler
For Your Safety Read Before Operating
Set space heating operation
Natural Gas Propane
Configuration of the cascade
Set domestic hot water DHW operation
Operating information
General
Protection features
Cascade
Boiler temperature regulation
Outdoor reset operation, if used
DHW, Night Setback, and Ramp Delay operation with Cascade
Sequence of the cascade
Sequence of operation
BLR Ignition
Knight XL control module
Shutdown
User
Access modes
Installer
To save parameters and exit programming
Set Point Met
Service
Standby
Prepurge
SYS ***.*F
Control will display the actual fan motor RPM
Delay
10V in **.Vdc
Operation of the cascade
Owner maintenance
Maintenance Maintenance and annual startup
Service technician
Clean condensate trap Check all piping for leaks
Maintenance
Address reported problems
Inspect boiler area
Check expansion tank
Flue vent system and air piping
Check water system
Check boiler relief valve
Check control settings
Check ignition ground wiring
Check all boiler wiring
Inspect ignition and flame sense electrodes
Review with owner
Check flame signal
Cleaning boiler heat exchanger
Diagrams
High Voltage
2Ladder Diagram
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