Biasi RIVA COMBI Installation instructions

BOILER INSTALLATION, OPERATION
INSTRUCTIONS
Riva COMBI
WALL HUNG GAS BOILER FOR
CENTRAL HEATING AND DOMESTIC
HOT WATER SUPPLY
Please Read Instructions Carefully
Save for Future Reference
— Do not store or use gasoline or other flammable vapors and liquids
in the vicinity of this or any other appliance.
— HAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in your
building.
• Immediately call your gas supplier from a neighbor’s phone.
Follow the gas supplier’s instructions.
• If you can not reach your gas supplier call the fire department.
— Installation and service must be performed by a qualified installer,
service agency or the gas supplier.
ARNING: If the information in this manual is not
followed exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
Manufactured by:
Biasi S.p.A.
Verona, Italy
Distributed By:
Quincy Hydronic Technology, Inc.
3560 Lafayette Road
Portsmouth, NH 03801
Phone: [phone]
Fax: [phone]
RIVA COMBI MANUAL - REV B

Dear Customer:
Thank you for uying a Biasi Riva Com i Boiler System.
The Riva Com i is a high efficiency, non-condensing, wall mounted gas oiler which
provides central heat and domestic hot water.
We realize that it is not possi le to answer all questions a out the Riva Com i oiler system in this
manual. Reading this installation manual does not make the reader an expert in all aspects of
installation and operation, and does not replace the need for a qualified, licensed heating
contractor. We urge you to contact your installing contractor or distri utor if you are in question
a out any aspect of your oiler's performance. Our main concern is that you are satisfied with your
oiler and its performance. We require that your contractor complete efficiency tests using
instruments.
The external controls and accessories listed in this manual (excluding those supplied inside the
oiler) are intended to serve as guidelines rather than specific recommendations. We realize that
other makes and models of such devices are availa le and can e used as successfully as those
we specify. The installing contractor is the est judge of a system's specific requirements, as well as
the local availa ility of certain makes and models of controls and accessories. The preceding does
not apply, however, to the equipment that comes with every oiler, such as the overheat control and
pressure relief valves. The installation of the specific devices supplied with every boiler is
absolutely necessary to the safe operation of the boiler and protection of the heating
system.
All BIASI wall hung oilers are uilt in accordance with the ASME oiler and pressure
vessel code, and ear the "H" stamp. The Entire range of applications for the Riva Com i
has een tested to standard CSA 4.9 and is CSA compliant.
This Riva Com i has a 2 year warranty, a copy of which is provided with the oiler. Please e sure
to return the warranty registration card as the warranty will e void without your oiler's serial
num ers (located on the ratings la el affixed to the oiler), date of installation and the name of your
installer eing on record in our files.
Thank you for purchasing our Riva Com i oiler. If you have questions or comments,
please don't hesitate to contact us immediately. Our goal is 100% customer satisfaction.
QHT inc.

RIVA COMBI MANUAL - REV B 3
Warnings - 5-6
Important Information - 7
General Information 1 8
Technical Information (M35.30CB) 2 8-9
Parts List 3 10
Internal Piping and Parts List 4 11
Electric Diagrams 5 12
Sequence of Operation 5.1 13
Installation Location 6 14
Exhaust Pipe Location 7 15
Mounting Bracket 8 16
Venting 9 17-25
Vent Requirements for Massachusetts 9 18
Restrictor Sizing 9.1 18
Fitting the Flue System 9.2 19
Choice of Flue 9.3 20-25
Pipe Connections 10 26
Gas Pipe Connections 11 27
Electrical Connections/Wiring 12 28-30
Power Connection 12.1 28
Connection to the Electricity Supply 12.2 28
Room Thermostat Connection 12.3 29
Relay Panel Connection 12.4 29
Zone Valve Microswitch Connection 12.5 30
Circulator Sizing 13 31
Circ. Cap. as a Function of Flow Rate 13.1 31
Expansion Vessels 13.2 31
Piping 14 32-35
Primary-Secondary Piping 14.1 33
Primary-Secondary with Zone Valves 14.2 34
Table of Content
Section Title Section Number Page Number

RIVA COMBI MANUAL - REV B
4
Manifold Piping with Zone Valves or Circ. 14.3 35
Commissioning 15 36-41
Filling the d.h.w. System 15.1 36
Initial Filling of the System 15.2 36
Lightning the Boiler 15.3 37
Checking the Gas Pres. at the Burner 15.4 37
Adjustment of the Gas Pressure 15.5 38
Checking the Ignition Device 15.6 38
Checking the Burner Ignition 15.7 39
Adjustment of the Useful c.h. Output 15.8 39
La els Placement 15.9 40
Checking Flue System and Com ustion 15.10 41
Instructing the User 15.11 41
Gas Conversion 16 42-43
Annual Maintenance 17 44-46
Warnings 17.1 44
Dismantling the External Panels 17.2 44
Emptying the d.h.w. System 17.3 44
Emptying the c.h. System 17.4 44
Cleaning the Primary Heat Exch. 17.5 45
Checking the Pressures. in C.h. Vess. 17.6 45
Checking the Pressures. in D.h.w. Vess. 17.7 45
Checking the Magnesium Anode 17.8 45
Cleaning the Burner 17.9 45
Checking the Flue 17.10 45
Visual Inspection of Appliance 17.11 45
Gas Pressures and Soundness 17.12 46
Installer Notes and Vent Part
Spares Vent Part Spares 18 41
Table of Content
Section Title Section Number Page Number

RIVA COMBI MANUAL - REV B 5
Boiler is certified as an indoor appliance. Do not install oiler outdoors or locate where
it will e exposed to freezing temperatures.
— Do not store or use gasoline or other flammable vapors and liquids
in the vicinity of this or any other appliance.
— HAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in your
building.
• Immediately call your gas supplier from a neighbour’s phone.
Follow the gas supplier’s instructions.
• If you can not reach your gas supplier call the fire department.
— Installation and service must be performed by a qualified installer,
service agency or the gas supplier.
ARNING: If the information in this manual is not followed
exactly, a fire or explosion may result causing property
damage, personal injury or loss of life.
Ca
ution: Do not store or use flammable materials, chemicals or flammable
liquids, especially gasoline, in the vicinity of this heating appliance.
WARNING
DANGER

RIVA COMBI MANUAL - REV B
6
Any appliance that urns natural gas, propane gas, fuel oil, wood or coal is capa le of
producing car on monoxide (CO). Car on Monoxide (CO) is a gas which is odorless,
colorless and tasteless ut is very toxic. CO is lighter than air and thus may travel
throughout the uilding.
BRIEF EXPOSURE TO HIGH CONCENTRATIONS OF CO, OR
PROLONGED EXPOSURE TO LESSER AMOUNTS OF CO MAY
RESULT IN CARBON MONOXIDE POISONING. EXPOSURE CAN BE
FATAL AND EXPOSURE TO HIGH CONCENTRATIONS MAY RESULT
IN THE SUDDEN ONSET OF SYMPTOMS INCLUDING
UNCONSCIOUSNESS.
Symptoms of CO poisoning include the following:
dizziness vision pro lems shortness of reath
headache loss of muscle control unclear thinking
nausea weakness unconsciousness
The symptoms of CO poisoning are often confused with those of influenza, and the
highest incidence of poisoning occurs at the onset of cold weather or during flu season.
A victim may not experience any symptoms, only one symptom, or a few symptoms.
Suspect the presence of carbon monoxide if symptoms tend to disappear when
you leave your home.
The following signs may indicate the presence of car on monoxide:
If any of the symptoms of CO occur or if any of the signs of car on monoxide are
present, VACATE THE PREMISES IMMEDIATELY AND CONTACT A QUALIFIED
HEATING SERVICE COMPANY OR THE GAS COMPANY OR THE FIRE
DEPARTMENT.
ONLY QUALIFIED, LICENSED SERVICE CONTRACTORS SHOULD PERFORM
ORK ON YOUR BIASI RIVA COMBI BOILER.
• Stale or smelly air.
• The presence of soot or car on in or
around the appliance.
• Very high unexplained humidity inside
the uilding.
• Hot gasses from appliance, venting
system pipes or chimney, escaping into
the living space.
• Flames coming out around the appliance.
• Yellow colored flames in the appliance.
WARNING

RIVA COMBI MANUAL - REV B 7
IMPORTANT INFORMATION
Please read this page carefully.
• ALL BOILERS MUST BE INSTALLED IN ACCORDANCE ITH NATIONAL, STATE AND
LOCAL PLUMBING, HEATING AND ELECTRICAL CODES AND ORDINANCES, AS
ELL AS THE REGULATIONS OF THE SERVING ELECTRICAL, ATER AND GAS
UTILITIES.
• All systems should be designed by competent contractors, and only persons
knowledgeable in the layout and installation of heating systems should attempt the
installation of any boiler. It is the responsibility of the installing contractor to see that
all controls are correctly installed and operating properly when the installation is
completed.
• This boiler is intended for use, only with propane or natural gas. All flammable liquids
(especially gasoline), chemicals, rags, paper, wood scraps, debris, etc., should be
kept away from the boiler at all times. Keep the boiler area clean and free of all fire
hazards.
• Please read the literature and warranties supplied by the manufacturers for the
various accessory equipment. This equipment is warranted by the respective
manufacturers, not by Quincy Hydronic Technologies, Inc. Each piece of equipment
must be installed and used according to the recommendations of the manufacturer.
Codes and Regulations:
Installation of the oiler and related equipment must conform to national, state and local
regulating agencies and codes applica le to the installation of the equipment. In the
a sence of local requirements, the following codes apply:
The a ove codes are availa le from:
A. ANSI/NFPA - #70 National Electric Code
B. ANSI/NFPA - #211 Chimneys and Vents
C. ANSI/NFPA - #Z223.1 National Fuel Gas Code
C. ANSI/NFPA - Domestic Gas Conversion Burner
D. CAN/CGA - B149 Installation Codes
E. ANSI/ASME - CSD-1
National Fire Protection Association (NFPA)
Battery March Park
Quincy, Massachusetts, 02269
http://www.nfpa.org
CSA International
8501 E. Pleasant Valley Road
Cleveland, OH 44134-5575
http://www.csa-international.org

RIVA COMBI MANUAL - REV B
8
The Riva Com i is a high efficiency, non-condensing, wall mounted gas oiler which provides
central heat and domestic hot water. The oiler features a gas valve which modulates the energy
input from 44,000 BTU/h to 108,000 BTU/h. The oiler is shipped fully assem led with the
components listed on page 11. All units are pressure and com ustion tested at the factory prior to
shipping.
Key Features:
• Wall mounta le - saving valua le floor
space.
• Several flue options availa le
• 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 e a lack of
water in the system.
• Frost protection - contains an integral frost
protection system to prevent frost damage
which can occur in areas suscepti le to
very cold weather conditions.
• Boiler operation recognition system -
should the oiler not e used for longer
than 24 hours, it then performs a controlled
system test to ensuring the motorized
components within the oiler do not
ecome inopera le due to lack of use.
• Gas valve modulation - the gas input
modulates ased 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.
GENERAL
Height in 35.4
Width in 23.6
Depth in 18.1
Weight l 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 = 55 °F (30 °C) gpm
3.99
Continous d.h.w production
∆T = 45 °F (25 °C) gpm
4.54
Continous d.h.w. production
∆T = 72 °F (40 °C) gpm
2.85
Preparation time min 7’57”
1. General Information
2. Technical Information (M35.30CB)

RIVA COMBI MANUAL - REV B 9
ENERGY CAPACITY
Nominal heat input
(0/2000ft) MBH 122.8
Nominal heat input
(2000/4500ft) MBH 116.7
Minimum heat input MBH 49.5
Maximum useful output
(0/2000ft) MBH 100.7
Maximum useful output
(2000/4500ft) MBH 95.9
Minimum useful output MBH 37.0
GAS SUPPLY PRESSURE
Gas Normal Min Max
Natural inwc 7.0 3.5 10.5
Propane inwc 11.0 8.0 12.0
GAS PRESSURE AT BURNER
Gas Min Max Ignition
Natural inwc 0.8 5.3 2.4
Propane inwc 1.4 9.0 5.2
FLUE DESIGN
Minimum Venturi pressure inwc 0.66
Flue pipe diameter
Coaxial in 2.25/4
3.25/5
Twin split pipes in 3.25/3.25
Nominal heat flow rate
(0/2000ft) MBH 122.8
Nominal heat flow rate
(2000/4500ft) MBH 116.7
Min Exhaust temperature °F 255
Max Exhaust temperature °F 302
INJECTORS No. Size
Natural 14 130
Propane 14 89
GAS FLOW RATE
Gas Min Max
Natural ft³/h 48.7 121.1
Propane l /h 2.23 5.55
ELECTRICAL
Voltage V 120
Frequency Hz 60
Current A < 1.6
Power consumption W 176
FLUE GAS FIGURES
Gas Min Max
CO2 2.2% 6.9%
O2 17.0% 8.6%
CLEARANCE TO COMBUSTIBLES
Front in 18
Back in 0
Top in 8
Sides in 2
Bottom in 8
Flue pipe enclosed in 2
Flue pipe ree air in 0
2.Technical
Information Cont.

RIVA COMBI MANUAL - REV B
10
Primary Components:
1
2
4
5
3
6
9
7
10
11
8
12
14
20
18
13
19
21
15
22
16
24
17
26
35
25
1 Pump
2 Pump vent plug
3 Automatic air purger valve
4 Modulation gas valve
5 Three-way diverter valve
6 D.h.w. expansion vessel
7 Flame-detecting electrode
8 Ignition electrodes
9 Burner
10 Com ustion cham er
11 Primary heat exchanger
12 Fan
13 Air pressure switch
14 Air switch pres. Test points
15 Main circuit air reathe valve
16 D.h.w. storage tank
17 Safety thermostat
18 Modulation operator
19 Gas valve outlet pres. Test point
20 Gas valve inlet pres. Test point
21 Central heating expansion vessel
22 Central heating temp. Pro e NTC
23 D.h.w. storage tank NTC
24 Central heating pressure relief valve
25 D.h.w. circuit pressure relief valve
26 Primary circuit flow switch
27 Main circuit drain cock
28 By-pass valve
29 Venturi device
30 Storage tank drain cock
31 Magnesium anode
32 Storage tank coil
33 Flue outlet pipe
34 Air Intake Pipe
35 Control panel
36 Safety thermostat pro e
37 Pressure reducing automatic fill valve
38 Backflow preventer
39 Gas supply line cock
40 D.h.w. inlet cock
3. Part Li t

RIVA COMBI MANUAL - REV B 11
7
4. Internal Piping & Part Li t
Note
:
• Pressure Relief Valves (#24, #25) should e piped to a drain or to the floor as
close as possi le to a drain.
• This diagram is a graphical representation only and is not drawn to scale. Do
not use for piping purposes.
29
13
34
33
26
11
8
19
1
24
4
20
3
5
16
28
21
12
7
22
23
18
36
9
27
31
32
6
30
15
25
37
38
39
40

RIVA COMBI MANUAL - REV B
12
ye k wh gy u rd
k gy
gy
gy
M
~
M
~
tt
pro e NTC
D.h.w. Temperature
Pro e NTC C.h. temperature
COM
NO
M
~
COM
NO
NC
123 k
un
rd
rd
gnyegywh
u
rd
k
u
wh
gyugnye
k k
rd k wh gygnye u
k
k
uu
u
u
rdk
gygy
un
n
u
L N
rd u n gnye gnye
gnye un
urd
gnye
rd
wh
k
Flow Switch
Primary Circuit
diverter valve
Three way Pump
Valve
Gas
External Controls
Terminal
Block
Electric Supply
Terminal
Block
Fan Safety
Thermostat
Air Pressure
Switch
Ignition
Electrodes
Flame Detection
Electrode
n - rown
u - lue
k - lack
wh - white
rd - red
gy - grey
ye - yellow
vt - violet
og - orange
gnye - green/yellow
1
3
2
wh
gy
rd
rd
k
u
n
gy
ye wh urd
1
k
rd
*
* ---> directly connected to the electronic ignition oard
5. Electric Diagram
Caution: Label all wires prior to disconnection when
servicing controls. iring errors can cause
improper and dangerous operation.
Verify proper operation after servicing

RIVA COMBI MANUAL - REV B 13
5.1 Sequence of Operation

RIVA COMBI MANUAL - REV B
14
The installation location chosen must:
• Comply with all clearances listed elow.
• Provide suita le location for the exhaust and intake venting.
• Not e installed in an unheated space.
• Comply with all local codes and standards.
Note: Dimensions shown are minimums. Greater clearances will simplify installation and
service.
Figure 6.1
ARNING: Do not install the boiler on carpeting
If the oiler is to e installed in an enclosed room with no fresh air intake, the room must have
proper vent louvers installed. There should e two louvers, place each within 12” of the ceiling and
floor respectively. Each vent will have a free area of 54 square inches.
Outside
Air Opening
Air Opening
Each opening free area =
1 sq. inch per 2,000 BTU/h
0 to 12"
0 to 12"
Figure 6.2
8
.
0
i
n
3
5
.
5
i
n
1
8
.
0
i
n
3
.
0
i
n
1
8
.
0
2
.
0
i
n
2
3
.
8
i
n
10.0
in
2
.
0
i
n
C
L
O
S
E
T
I
N
S
T
A
L
L
A
T
I
O
N
M
I
N
I
M
U
M
P
E
R
M
A
N
A
N
T
C
L
E
A
R
A
N
C
E
F
R
O
N
T
V
I
E
S
I
D
E
V
I
E
C
L
O
S
E
T
I
N
S
T
A
L
L
A
T
I
O
N
C
L
O
S
E
T
I
N
S
T
A
L
L
A
T
I
O
N
S
E
R
V
I
C
E
C
L
E
A
R
A
N
C
E
6. In tallation Location
Note
: For oilers in an enclosed
space it is recommended to install
a CO detector in the oiler room.

RIVA COMBI MANUAL - REV B 15
When choosing an installation location insure the exhaust and intake pipes comply with NFPA 54.
The drawing on the next page illustrates the restrictions on exhaust locations.
The Exhaust Hood must be installed on the leeward side of house and conform to the
following guidelines:
1. The Vent hood shall not e less than 3 feet a ove any forced air inlet to the house.
2. The Vent hood shall not e less than 1 foot elow, 1 foot horizontally, or 1 foot a ove any door,
window or gravity inlet into any uilding.
3. The Vent hood shall not e less than 2 feet from an adjacent uilding.
4. The Vent hood shall e not less than 7 feet a ove grade when located adjacent to pu lic
walkway.
5. The Vent hood shall e located so that flue gasses are not directed to jeopardize people,
overheat com usti le structures, materials or enter uildings.
6. Minimum of 4 feet horizontal clearance from electric meters, gas meters, regulators and relief
equipment.
7. All joints in system are to be sealed to prevent leakage of products of combustion in the
building.
8. Avoid installing exhaust hood on the North, West, or the side of the house receiving the
prevailing winds.
9. The vent should not e situated so that the flue gases are directed towards rickwork, siding, or
other construction, in such a manner that may cause damage from heat or condensate from the
flue gases
7. Exhau t Pipe Location
CAUTION
EXTERNAL VENT SURFACES ARE HOT.
NOTE: USE ONLY LISTED COMPONENTS SUPPLIED ITH THE BOILER. SURFACE
DISCOLORATION OF THE BUILDING MAY OCCUR DUE TO IMPROPER INSTALLATION.
QHT ILL NOT ACCEPT RESPONSIBILITY OR LIABILITY FOR SUCH DISCOLORATION.
IT IS RESPONSABILITY OF THE HOMEO NER TO KEEP THE VENT TERMINAL
CLEAR OF SNO AND ICE

RIVA COMBI MANUAL - REV B
16
After a suitable installation location is chosen, verify that the mounting wall is properly
braced and strong enough to support the 300 pound weight of the unit when filled with
water.
NOTE: The boiler shall be installed such that the gas ignition system components are
protected from water and liquids in general (dripping,spraying, rain, etc) during the
appliance operation and service.
Use the paper template provided with the oiler to determine the location of the mounting racket.
Securely mount the racket to the wall using appropriate hardware for the particular wall
construction.
Mounting Steps:
1. Tape the paper template to the wall in the chosen location. Be sure to level the template.
2. Pre-drill two holes in the center of the “oval” slots on the mounting racket, sized for the
hardware eing used.
3. Mount the racket to the wall. Be sure to level the racket y adjusting the screw in the
vertical slot.
4. Pre-drill the remaining hole in the mounting racket and secure the final screw.
5. Mark and drill the exhaust/intake pipe holes through the house. If you are using a coaxial
pipe system, drill the hole marked A (ø 4”) in the drawing elow and on the paper template.
If you are using a separate pipe system drill holes marked B and C (ø 3.25”) shown elow
as well as on the paper template.
6. Remove paper template and hang oiler on racket.
Figure 8.1
23.6
3.0
1.4
15.7
0.6
5.3
3.3
3.0
3.7
2.0 3.3 2.8 7.6
2.3
2.6
35.4
1.4
1.5
1.5
B
Gas
A
C
C.h. Supply
D.h.w. outlet pipe
D.h.w. inlet pipe
C.h. return
Supporto di
fissaggo
caldaia
7.5
11.2
C
A e B
18.1
D.h.w.
PRV
C.h.
PRV
8. Mounting Bracket

RIVA COMBI MANUAL - REV B 17
The Riva is a mechanical draft, side wall vented oiler. There are two side wall flue options
availa le – separate and coaxial. The coaxial option has one configuration shown on the next
page. The separate option has two possi le 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 ith 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 oiler that was attached to a common vent system, the common venting
system is likely to e too large for proper venting of the appliances remaining connected to it. To
ensure the remaining appliances will function properly, the test procedure elow should e followed:
At the time of removal of an existing oiler, the following steps shall e 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.
A. Seal any unused openings in the common venting system.
B. Visually inspect the venting system for proper size and horizontal pitch and determine there
is no lockage or restriction, leakage, corrosion and other deficiencies which could cause an
unsafe condition.
C. insofar as is practical, close all uilding doors and windows and all doors etween the space
in which the appliances remaining connected to the common venting system are located
and other spaces of the uilding. Turn on clothes dryers and any appliance not connected to
the common venting system. Turn on any exhaust fans, such as range hoods and athroom
exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
D. Place in operation the appliance eing inspected. Follow the lighting instructions. Adjust
thermostat so appliance will operate continuously.
E. Test for spillage at the draft hood relief opening after 5 minutes of main urner operation.
Use the flame of a match or candle, or smoke from a cigarette, cigar or pipe.
F. After it has een determined that each appliance remaining connected to the common
venting system properly vents when tested as outlined a ove, return doors, windows,
exhaust fans, fireplace dampers and any other gas- urning appliance to their previous
condition of use.” (g) Any improper operation of the common venting system should e
corrected so the installation conforms with the National Fuel Gas Code, ANSI Z223.1 and/or
CAN/CGA B149, Installation Codes. When resizing any portion of the common venting
system, the common venting system should e resized to approach the minimum size as
determined using the appropriate ta les in Part 11 of the National Fuel Gas Code, ANSI
Z223.1 and/or CAN/CGA B149, Installation Codes.
9. Venting

RIVA COMBI MANUAL - REV B
18
The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00
and 5.00 for installation of through – the – wall vented gas appliances as follows:
(a) For direct-vent appliances, mechanical-vent heating appliances or domestic hot water equipment, where
the bottom o the vent terminal and the air intake is installed below our eet above grade the ollowing
requirements must be satis ied:
1. I there is not one already present, on each loor level where there are bedroom(s), a carbon monoxide
detector and alarm shall be placed in the living area outside the bedroom(s). The carbon monoxide
detector shall comply with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall be located in the room that houses the appliance or equipment and
shall:
a. Be powered by the same electrical circuit as the appliance or equipment such that only one
service switch services both the appliance and the carbon monoxide detector;
b. Have battery back-up power;
c. Meet ANSI/UL 2034 Standards and comply with NFPA 720 (2005 Edition);and
d. Have been approved and listed by a Nationally Recognized Testing Laboratory as recognized
under 527 CMR.
3. A Product-approved vent terminal must be used, and i applicable, a Product-approved air intake must be
used. Installation shall be in strict compliance with the manu acturer’s instructions. A copy o the
installation instructions shall remain with the appliance or equipment at the completion o the
installation.
4. A metal or plastic identi ication plate shall be mounted at the exterior o the building, our eet directly
above the location o vent terminal. The plate shall be o su icient size to be easily read rom a distance
o eight eet away, and read “Gas Vent Directly Below”.
(b) For direct-vent appliances, mechanical-vent heating appliances or domestic hot water equipment where
the bottom o the vent terminal and the air intake is installed above our eet above grade the ollowing
requirements must be satis ied:
1. I there is not one already present, on each loor level where there are bedroom(s), a carbon monoxide
detector and alarm shall be placed in the living area outside the bedroom(s). The carbon monoxide
detector shall comply with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall:
a. Be located in the room that houses the appliance or equipment;
b. Be either hard-wired or battery powered or both; and
c. Shall comply with NFPA 720 (2005 Edition).
3. A Product-approved vent terminal must be used, and i applicable, a Product-approved air intake must
be used. Installation shall be in strict compliance with the manu acturer’s instructions. A copy o the
installation instructions shall remain with the appliance or equipment at the completion o the
installation.
9. Venting Requirement for the State of
Ma achu ett

RIVA COMBI MANUAL - REV B 19
The Riva is a mechanical draft, side wall vented oiler. There are two flue options availa le -
separate and coaxial. The coaxial option has one configuration shown on the next page. The
separate option has two possi le configurations shown on the following pages.
9.1 Restrictor Sizing:
Each exhaust option is shipped standard with 3 feet of exhaust pipe, 3 feet of intake air pipe. There
is also a restrictor kit in which there are some restrictors that must e placed in exhaust reech of
fan on the top of the oiler (Fig. 9.1) according to the flue configuration used.
If additional flue piping is need for a particular application, it can e ordered separately in 3 feet
increments. Depending on the final flue pipe length, an alternative restrictor may e required. Refer
to the ta les 9.1 for proper restrictor ring sizing
Figura 9.1
Coaxial 2.5/4.0
Restrictor
Size
From 1.65 to 3.30 (ft) 41
From 3.30 to 8.86 (ft) 44
Separate 3.25/3.25
Restrictor
Size
For 1.
65 and 1.65
(ft. in +out) 38
From 3.30 to 39.40
(ft in+out) 41
Ta le 9.1
9.2 Fitting the flue system:
In general, it has to e taken in consideration that the horizontal sections of the flue pipe must have
a horizontal sloping not less than 1.5 degree (0.3 in per ft) away from the oiler. In the standard
horizontal flue kit the flue pipe is angled within the air duct therefore the air duct must e
horizontally installed. If one or more extensions have to e used they must e adequately
supported so that there is no sag in the flue pipe and a minimum fall of 1.5 degree (0.3 in per ft)
over the whole length away from the oiler is ensured.
9. Venting Cont.

RIVA COMBI MANUAL - REV B
20
9.3 Choice of flue:
The following flue kits are availa le for connecting to the oiler:
A Standard coaxial horizontal flue kit (Exhaust & intake outside)
Figure 9.2 (Coaxial 2.5/4.0 inches – nominal length 3.3 ft)
It can e fitted to allow discharge to the rear or either side of the oiler via the flanged oiler
adapter el ow. Minimum length required is 1 ft. Maximum equivalent length of 13 ft can e
achieved utilising extensions. This flue system can only e used to discharge horizontally; it
is not designed to enable termination in the vertical plane.
Installation:
• Drill hole A (on the wall template) through the outside wall that is less than 18” thick.
• Cut the pipes as necessary so that a no more than 6” protrudes from the house.
• Slide the intake and exhaust pipes through the hole.
• Slide one ru er wall trim piece on the pipe from inside and one from outside.
• Connect exhaust (inner) pipe to concentric el ow.
• Connect intake (outer) pipe to concentric el ow.
• Secure el ow to oiler using gasket and four screws provided.
• Secure end cap on the intake pipe outside the house.
9. Venting Cont.