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Contents
HAZARD DEFINITIONS .................................................... 2
PLEASE READ BEFORE PROCEEDING ........................ 3
THE CREST -- HOW IT WORKS ................................... 4-5
RATINGS ........................................................................... 6
1. DETERMINE BOILER LOCATION
Clearances ......................................................................... 7
Provide Air Openings to Room .......................................... 8
Flooring and Foundation ................................................... 8
Vent and Air Piping ............................................................ 8
Prevent Combustion Air Contamination ............................. 8
Using an Existing Vent System to Install a New Boiler ..... 9
Corrosive Contaminants and Sources ............................... 9
Removing a Boiler from Existing Common Vent.............. 10
Remove Boiler from Wood Pallet ..................................... 11
Combustion and Ventilation Air Requirements ........... 12-13
2. GENERAL VENTING
Direct Venting Options - Sidewall Vent ............................ 14
Direct Venting Options - Vertical Vent .............................. 14
Direct Venting Options - Vert. Vent, Opt. Rm Air............. 14
Direct Venting Options - Vert. Vent, Sidewall Air ............. 14
Install Vent and Combustion Air Piping ........................... 15
Air Inlet Pipe Materials................................................ 15
Requirements for Installation in Canada .......................... 15
Vent and Air Piping .......................................................... 16
Air Intake / Vent Connections .......................................... 16
Min./Max. Combustion Air & Vent Piping Lengths ........... 17
Vent and Air Piping .......................................................... 17
Common Venting ............................................................. 18
3. VERTICAL DIRECT VENTING
Vent/Air Termination - Vertical ......................................... 19
Determine Location..................................................... 19
Prepare Roof Penetrations ......................................... 19
Termination and Fittings ........................................ 19-20
Multiple Vent/Air Terminations .................................... 20
4. SIDEWALL DIRECT VENTING
Vent/Air Termination - Sidewall ................................... 21-23
Determine Location................................................ 21-23
Prepare Wall Penetrations .......................................... 22
Termination and Fittings ............................................. 22
Multiple Vent/Air Terminations ............................... 22-23
Room Air ..................................................................... 23
5. HYDRONIC PIPING
System Water Piping Methods ......................................... 24
Low Water Cutoff Device ................................................. 24
Chilled Water System....................................................... 24
Freeze Protection ............................................................. 24
General Piping Information .............................................. 24
Circulator Sizing ............................................................... 25
Near Boiler Piping Components .................................. 26-30
6. GAS CONNECTIONS
Connecting Gas Supply Piping ........................................ 31
Natural Gas ...................................................................... 32
Pipe Sizing for Natural Gas ........................................ 32
Natural Gas Supply Pressure Requirements ............. 32
Propane Gas .................................................................... 32
Pipe Sizing for Propane Gas ...................................... 32
Propane Supply Pressure Requirements ................... 32
Check Inlet Gas Supply .............................................. 33-34
Gas Pressure ................................................................... 34
Gas Valve Replacement .................................................. 34
7. FIELD WIRING
Line Voltage Connections ................................................ 35
Low Voltage Connections ................................................ 36
Wiring of the Cascade ...................................................... 37
8. CONDENSATE DISPOSAL
Condensate Drain ............................................................ 39
9. STARTUP ............................................................... 40-45
10. OPERATING INFORMATION
General........................................................................ 46-48
Cascade ........................................................................... 49
Sequence of Operation .................................................... 50
Status Screen ................................................................... 51
Main Screen ..................................................................... 52
11. MAINTENANCE
Maintenance & Annual Startup .............................. 53-57
12. DIAGRAMS
Ladder Diagrams .............................................. 58,60,62
Wiring Diagrams ............................................... 59,61,63
Revision Notes .................................................. Back Cover
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or
to important information concerning the life of the product.
 DANGER
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious
 WARNING injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
 CAUTION injury.
CAUTION
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not
related to personal injury or property damage.
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