Venting - Biasi Riva Combi Installation & Operation Instructions

3.3
B
1.4
3.0
Gas
2.0 3.3

9. Venting

The Riva is a mechanical draft, side wall vented boiler. There are two side wall flue
options available – separate and coaxial. The coaxial option has one configuration shown
on the next page. The separate option has two possible configurations shown on the
following pages. There is also a vertical roof venting option. Regardless of what vent kit
is installed, they should all conform to the Provisions for combustion and ventilation air in
accordance with section 5.3, Air for Combustion and Ventilation, of the National Fuel Gas
Code, ANSI Z223.1, or Sections 7.2, 7.3 or 7.4 of CAN/CGA B149, Installation Codes, or
applicable provisions of the local building codes.
If the Biasi Riva replaces a boiler that was attached to a common vent system, the
common venting system is likely to be too large for proper venting of the appliances
remaining connected to it. To ensure the remaining appliances will function properly, the
test procedure below should be followed:
At the time of removal of an existing boiler, the following steps shall be followed with
each appliance remaining connected to the common venting system placed in
operation, while the other appliances remaining connected to the common venting
system are not in operation.
Seal any unused openings in the common venting system.
A.
Visually inspect the venting system for proper size and horizontal pitch and
B.
determine there is no blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
insofar as is practical, close all building doors and windows and all doors between
C.
the space in which the appliances remaining connected to the common venting
RIVA COMBI MANUAL - REV B
3.7
C
A
5.3
3.0
15.7
0.6
1.4
Supporto di
fissaggo
caldaia
D.h.w.
PRV
C.h. retu rn
D.h.w. inlet pi pe
D.h.w. outlet pi pe
C.h. Supply
2.8 7.6 2.6
2.3
23.6
Figure 8.1
11.2
7.5
35.4
C.h.
PRV
1.5
1.5
C
A e B
18.1
18