Viessmann Vitocrossal 300 CU3A Installation Instructions Manual page 5

CU3A Venting Systems Installation
Single Pipe Venting
(Room Air Dependent)
Venting - Single Pipe (Room Air Dependent).................43
Vent Requirements....................................................43
Combustion air supply............................................43
General Installation Information...................................44
Installation steps (outline).......................................45
Exhaust vent pipe material......................................45
Approved material for single pipe vent system...........46
Support system.....................................................46
Flashing and storm collar installation........................46
Additional requirements for stainless steel
vent pipe material..................................................47
Vent Requirements - Stainless Steel...........................47
Exhaust vent termination options.............................47
Exhaust vent pipe connection to boiler......................47
Vent system manufacturers.....................................47
Component parts of the venting system....................47
Vent Requirements - CPVC........................................48
Additional requirements for CPVC vent pipe material..48
Exhaust vent pipe connection to boiler......................48
Required starter adaptors and mesh screen for
CPVC system........................................................48
Requirements for UL/ULC Listed Rigid PP(s)
Vent Pipe Material.....................................................49
Vent system manufacturers...................................49
Side Wall Vent Termination........................................50
Vent Length Requirements.........................................51
Maximum vent pipe length - horizontal.....................51
Maximum allowable vent length - horizontal..............51
Maximum vent pipe length - vertical.........................52
Maximum allowable vent length - vertical.................52
Component Installation Guide.....................................53
General single-pipe vertical venting layout.................53
Single-pipe vent starter adaptor installation..............54
Ceiling/Roof opening...............................................54
Flashing and storm collar installation........................54
Vent Termination Location Requirements.....................55
Vertical installations...............................................55
Flashing and storm collar installation........................55
Vent Length Requirements.........................................56
Equivalent vent length calculation example - vertical
(stainless steel only)..............................................56
Standard long sweep elbows...................................56
Standard long sweep elbows (for CPVC pipe only).....56
Flue Vent Length Requirements..................................57
Multiple boiler installations (vertical termination).......57
Multiple boiler installations (horizontal termination).....57
Installation of Support System - PP(s).........................58
Supports...............................................................58
Bracing.................................................................58
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