2
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
WARNING
CAUTION
CAUTION
NOTICE
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
injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not
related to personal injury or property damage.
HAZARD DEFINITIONS
................................................................. 2
PLEASE READ BEFORE PROCEEDING
.............................. 3
THE NOBLE COMBI BOILER -- HOW IT WORKS
.............. 4-5
RATINGS
............................................................................................ 6
1. DETERMINE BOILER LOCATION
Provide Clearances .............................................................................. 7
Provide Air Openings to Room ......................................................... 9
Wall Mounting Location ................................................................... 9
Residential Garage Installation .......................................................... 9
Vent and Air Piping ............................................................................ 9
Prevent Combustion Air Contamination ........................................ 9
Corrosive Contaminants and Sources ............................................ 10
Using an Existing Vent System to Install a New Boiler ............... 10
Removing a Boiler from Existing Common Vent ........................ 11
2. PREPARE BOILER
Remove Boiler from Wood Pallet ................................................... 12
Gas Conversions .......................................................................... 12-13
Mounting the Boiler .......................................................................... 13
3. GENERAL VENTING
Direct Venting Options .................................................................... 14
Install Vent and Combustion Air Piping ....................................... 15
Sizing ................................................................................................... 16
Max. Allowable Vent Piping Lengths ............................................. 16
Materials .............................................................................................. 16
Optional Room Air ............................................................................ 17
PVC/CPVC ......................................................................................... 18
Polypropylene ...................................................................................... 19
Stainless Steel Vent ............................................................................ 20
4. SIDEWALL DIRECT VENTING
Vent/Air Termination - Sidewall .............................................. 21-23
Determine Location ............................................................... 21-22
Prepare Wall Penetrations .......................................................... 23
Multiple Vent/Air Terminations ..................................................... 23
Sidewall Termination - Optional Concentric Vent ................ 24-26
5. VERTICAL DIRECT VENTING
Vent/Air Termination - Vertical ............................................... 27-28
Determine Location ..................................................................... 27
Prepare Roof Penetrations .......................................................... 28
Multiple Vent/Air Terminations ..................................................... 28
Vertical Termination - Optional Concentric Vent ................. 29-30
Alternate Vertical Concentric Venting .................................... 31-32
6A. HYDRONIC PIPING
System Water Piping Methods ........................................................ 33
Low Water Cutoff Device ................................................................. 33
Chilled Water System ........................................................................ 33
Freeze Protection ............................................................................... 33
General Piping Information ............................................................. 33
Near Boiler Piping Components ..................................................... 34
Hydronic Piping Diagrams ......................................................... 36-39
6B. DOMESTIC WATER PIPING
Scalding ............................................................................................... 40
Water Chemistry ................................................................................ 40
Near Heater Piping Components .................................................... 40
Domestic Water Piping Diagrams ............................................ 41-43
7. GAS CONNECTIONS
Connecting Gas Supply Piping ........................................................ 44
Natural Gas ......................................................................................... 45
Pipe Sizing for Natural Gas ........................................................ 45
Natural Gas Supply Pressure Requirements ............................ 45
Propane Gas ........................................................................................ 45
Pipe Sizing for Propane Gas ....................................................... 45
Propane Supply Pressure Requirements ................................... 45
Check Inlet Gas Supply ............................................................... 46-47
Gas Pressure ....................................................................................... 47
Gas Valve Replacement .................................................................... 47
8. FIELD WIRING
Line Voltage Connections ................................................................ 48
Low Voltage Connections ................................................................ 48
9. CONDENSATE DISPOSAL
Condensate Drain .............................................................................. 51
10. STARTUP
............................................................................ 52-60
11. OPERATING INFORMATION
General ................................................................................................ 61
Menus ............................................................................................. 61-62
Control Inputs and Outputs ....................................................... 63-64
Cascade ................................................................................................. 65
Protection Features ....................................................................... 65-66
Sequence of Operation ................................................................ 66-68
12. MAINTENANCE
Maintenance and Annual Startup ............................................. 69-74
13. TROUBLESHOOTING
.................................................... 75-86
14. DIAGRAMS
Ladder Diagram (Standard) ............................................................. 87
Wiring Diagram (Standard) ............................................................. 88
Revision Notes .................................................................... Back Cover
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