QHT Riva Combi User manual and instructions - page 8
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. 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.
• 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.
2. Technical Information (M35.30CB)
RIVA COMBI USER MANUAL - REV A
8
GENERAL
Height in
35.4
Width in
23.6
Depth in
18.1
Weight lb
172
CENTRAL HEATING
Maximum working temp.
°F
185
Temp. Regulation range*
°F
100-176
Maximum pressure
psi
30.0
Minimum pressure
psi
4.35
Max head loss (at 4.4 GPM)
ft
10
*At the minimum useful output
DOMESTIC HOT WATER
Maximum temperature
°F
140
Minimum temperature
°F
100
Maximum pressure
psi
116
Useful tank capacity
gal
13.2
D.h.w circuit flow rate
∆T = 30 °K
gpm
3.99
Continous d.h.w production
∆T = 25 °K
gpm
4.54
Continous d.h.w. production
∆T = 40 °K
gpm
2.85
Preparation time
min
7’57”