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
DOMESTIC HOT WATER
Maximum temperature
Minimum temperature
Maximum pressure
Useful tank capacity
D.h.w circuit flow rate
∆T = 55 °F (30 °C)
Continous d.h.w production
∆T = 45 °F (25 °C)
Continous d.h.w. production
∆T = 72 °F (40 °C)
Preparation time
8
35.4
in
23.6
in
18.1
in
172
lb
140
°F
100
°F
116
psi
13.2
gal
3.99
gpm
4.54
gpm
2.85
gpm
7'57"
min
• 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.
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
°F 185
100-176
°F
psi 30.0
4.35
psi
ft 10