General Information; Technical Information (M35.30Cb) - Biasi Riva Combi Installation & Operation Instructions

1. General Information

The Riva Combi is a high efficiency, non-condensing, wall mounted gas boiler which
provides central heat and domestic hot water. The boiler features a gas valve which
modulates the energy input from 44,000 BTU/h to 108,000 BTU/h. The boiler is shipped
fully assembled with the components listed on page 11. All units are pressure and
combustion tested at the factory prior to shipping.
Key Features:
• Wall mountable - saving valuable floor
space.
• Several flue options available
• Electronic spark ignition
• Safety flow switch - positioned on the
main circuit, which monitors the flow
and protects the main heat exchanger
from thermal shock should there be a
lack of water in the system.
• Frost protection - contains an integral
frost protection system to prevent frost
damage which can occur in areas
susceptible to very cold weather
conditions.

2. Technical Information (M35.30CB)

GENERAL
Height
Width
Depth
Weight
CENTRAL HEATING
Maximum working temp.
Temp. Regulation range*
Maximum pressure
Minimum pressure
Max head loss (at 4.4 GPM)
*At the minimum useful output
RIVA COMBI MANUAL - REV B
35.4
in
in 23.6
18.1
in
172
lb
185
°F
100-176
°F
30.0
psi
4.35
psi
10
ft
• Boiler operation recognition system -
should the boiler not be used for
longer than 24 hours, it then performs
a controlled system test to ensuring
the motorized components within the
boiler do not become inoperable due
to lack of use.
• Gas valve modulation - the gas input
modulates based off central heating
and domestic hot water temperature
to within ± 2 ºF
• Diagnostic information system
equipped with three LED diagnostic
lights for quick error assessment.
DOMESTIC HOT WATER
Maximum temperature
Minimum temperature
Maximum pressure
Useful tank capacity
D.h.w circuit flow rate
ΔT = 30 °K
Continous d.h.w production
ΔT = 25 °K
Continous d.h.w. production
ΔT = 40 °K
Preparation time
140
°F
100
°F
116
psi
13.2
gal
3.99
gpm
4.54
gpm
2.85
gpm
7'57"
min
9