Crestron electronic
1.5, 3.5, 2.5 General venting, Direct venting, Optional room air
Install
GAS Piping Size Chart
Alarm contacts
Connecting gas supply piping
Maintenance
Configuration of the cascade
Check control settings
Cleaning boiler heat exchanger
Outdoor temperature sensor
How to
Page 14
Installation & Operation Manual
2
General venting
Direct venting
Sidewall
Vertical Vent, Sidewall Air
Vertical
Optional room air
Sidewall
Vertical
14
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Page 15
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Contents
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Contents
When servicing boiler
Please read before proceeding
Crest How it works
Blowers
Crest How it works Models 1.5 2.0 2.5 3.0
Ratings
Crest Ahri Rating
Before locating the boiler, check
Installation must comply with
Determine boiler location
Provide clearances
Vent and air piping
Provide air openings to room
Flooring and foundation
Prevent combustion air contamination
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
Remove boiler from wood pallet
7Combustion Air from Outside Single Opening
Minimum Recommended Combustion AIR Supply to Equipment Room
Optional room air
General venting
Direct venting
Install vent and combustion air piping
Air inlet pipe materials
Approved Stainless Steel Vent Manufacturers Make Model
Air intake/vent connections
Removing from existing vent
Common venting
Determine location
Vertical direct venting
Vent/air termination vertical
Prepare roof penetrations
Multiple vent/air terminations
4Alternate Vertical Terminations with Multiple Boilers
Sidewall direct venting
Vent/air termination sidewall
Prepare wall penetrations
2Clearance to Doors and Windows
Room air
4Multiple Vent Terminations must also comply with Figure
Hydronic piping
20F 40F 60F
Circulator sizing
Model
Near boiler piping components
System
Multiple Boilers Common Header Primary / Secondary Flow
For all equipment and detailing required by local codes
Hydronic piping
Model Gas Inlet Size
Connecting gas supply piping
Gas connections
Natural gas
Propane Gas
GAS Piping Size Chart
Check inlet gas supply
Gas valve replacement
Gas Pressure
Line voltage connections
Field wiring
Installation must comply with
Louver proving switch
Enable
Outdoor temperature sensor
Low voltage connections
Wiring of the cascade
Auxiliary switch 1
Alarm contacts
System supply sensor
Wiring
Field
Condensate disposal
Condensate drain
Check/control water chemistry
Freeze protection when used
Start-up
Fill and test water system
Inspect 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
Gas Natural Gas Propane Valve
Set clock
Verify HWG circulator mode Set HWG target temperature
Configuration of the cascade
Operating information
General
Protection features
Boiler temperature regulation
Outdoor reset operation, if used
Cascade
Sequence of operation
Crest control module
Home Screen
2Main Menu Screen
Owner maintenance
Maintenance Maintenance and annual startup
Service technician
See the Crest User’s Information Manual for Instructions
Maintenance
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
Check flame signal
Handling ceramic fiber materials
Cleaning boiler heat exchanger
Review with owner
Niosh stated First Aid
Diagrams
Integrated Control
2Wiring Diagram
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