QHT Riva Manual

BOILER INSTALLATION, OPERATION
INSTRUCTIONS
Riva HEAT ONLY
WALL HUNG GAS BOILER FOR
CENTRAL HEATING 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 Technologies, Inc.
3560 Lafayette Road
Portsmouth, NH 03801
Phone: [phone]
Fax: [phone]
RIVA HEAT ONLY MANUAL - REV B

RIVA HEAT ONLY MANUAL - REV B
3
Dear Customer:
Thank ou for bu ing a Biasi Riva Heating Onl Boiler S stem.
The Riva Heating Onl is a high efficienc , non-condensing, wall mounted gas boiler
which provides central heat suppl water.
We realize that it is not possible to answer all questions about the Riva boiler s stem 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 ou to contact our installing contractor or distributor
if ou are in question about an aspect of our boiler's performance. Our main concern is
that ou are satisfied with our boiler and its performance. We require that our contractor
complete efficienc tests using instruments.
The external controls and accessories listed in this manual (excluding those supplied
inside the boiler) are intended to serve as guidelines rather than specific
recommendations. We realize that other makes and models of such devices are available
and can be used as successfull as those we specif . The installing contractor is the best
judge of a s stem's specific requirements, as well as the local availabilit of certain makes
and models of controls and accessories. The preceding does not appl , however, to the
equipment that comes with ever boiler, 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 boilers are built in accordance with the ASME boiler and pressure
vessel code, and bear the "H" stamp. The Entire range of applications for the Riva boiler
has been tested to standard CSA 4.9 and is CSA compliant.
This Riva Heating Onl boiler has a 2 ear warrant , a cop of which is provided with the
boiler. Please be sure to return the warrant registration card as the warrant will be void
without our boiler's serial numbers (located on the ratings label affixed to the boiler), date
of installation and the name of our installer being on record in our files.
Thank ou for purchasing our Riva Heating Onl boiler. If ou have questions or
comments, please don't hesitate to contact us immediatel . Our goal is 100% customer
satisfaction.
QHT inc.

RIVA HEAT ONLY MANUAL - REV B
4
Warnings - 6-7
Important Information - 8
General Information 1 9
Technical Information (M130.30CR) 2 9-10
Parts List 3 11
Internal Piping and Parts List 4 12
Electric Diagrams 5 13
Sequence of Operation 5.1 14
Installation Location 6 15
Exhaust Pipe Location 7 16
Mounting Bracket 8 17
Venting 9 18-21
Massachusetts venting requirements 9 19
Restrictor Sizing 9.1 20
Fitting the Flue S stem 9.2 20
Choice of Flue 9.3 21-26
Pipe Connections 10 27
Gas Pipe Connections 11 28
Electrical Connections/Wiring 12 29-31
Power Connection 12.1 29
Connection to the Electricit Suppl 12.2 29
Room Thermostat Connection 12.3 30
Rela Panel Control Connection 12.4 30
Zone Valve Microswitch Connection 12.5 31
Circulator Sizing 13 32
Circ. Cap. as a Function of Flow Rate 13.1 32
Expansion Vessel 13.2 32
Piping 14 33-36
Primar -Secondar Piping 14.1 34
Primar -Secondar with Zone Valves 14.2 35
Ta
ble of Contents
Section Title Section N mber Page N mber

RIVA HEAT ONLY MANUAL - REV B
5
Manifold Piping with Zone Valves or Circ. 14.3 36
Commissioning 15 37-42
Initial Filling of the S stem 15.1 37
Lightning the Boiler 15.2 37
Checking the Gas Pres. at the Burner 15.3 38
Adjustment of the Gas Pressure 15.4 38
Checking the Ignition Device 15.5 39
Checking the Burner Ignition 15.6 40
Adjustment of the Useful c.h. Output 15.7 40
Labels Placement 15.8 41
Checking the Flue S stem and Comb. 15.9 42
Instructing the User 15.10 42
Gas Conversion 16 43
Annual Maintenance 17 44-45
Warnings 17.1 44
Dismantelling the External Panels 17.2 44
Empt ing the C.h. S stem 17.3 44
Cleaning the Primar Heat Exch. 17.4 44
Checking the Pressures. in C.h. Vess. 17.5 45
Cleanig the Burner 17.6 45
Checking the Combustion fan 17.7 45
Checking the Flue 17.8 45
Visual Inspection of Appliance 17.9 45
Gas Pressures and Soundness 17.10 45
Vent Part Spares 18 46-48
Installer Notes 19 50
Table of Contents
Section Title Section N mber Page N mber

RIVA HEAT ONLY MANUAL - REV B
6
Boiler is certified as an indoor appliance. Do not install boiler outdoors or locate where
it will be 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 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.
Caution: Do not store or use flammable materials, chemicals or flammable
liquids, especially gasoline, in the vicinity of this heating appliance.
WARNING
DANGER

RIVA HEAT ONLY MANUAL - REV B
7
An appliance that burns natural gas, propane gas, fuel oil, wood or coal is capable of
producing carbon monoxide (CO). Carbon Monoxide (CO) is a gas which is odorless,
colorless and tasteless but is ver toxic. CO is lighter than air and thus ma travel
throughout the building.
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.
S mptoms of CO poisoning include the following:
dizziness vision problems shortness of breath
headache loss of muscle control unclear thinking
nausea weakness unconsciousness
The s mptoms 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 ma not experience an s mptoms, onl one s mptom, or a few s mptoms.
Suspect the presence of carbon monoxide if symptoms tend to disappear when
you leave your home.
The following signs ma indicate the presence of carbon monoxide:
If an of the s mptoms of CO occur, or if an of the signs of carbon 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 HEAT ONLY BOILER.
•
Stale or smell air.
• The presence of soot or carbon in
or around the appliance.
• Ver high unexplained humidit
inside the building.
•
Hot gasses from appliance, venting
s stem pipes or chimne , escaping into
the living space.
• Flames coming out around the
appliance.
• Yellow colored flames in the appliance
WARNING

RIVA HEAT ONLY MANUAL - REV B
8
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 warranty supplied by the manufacturers of 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 boiler and related equipment must conform to national, state and
local regulating agencies and codes applicable to the installation of the equipment.
In the absence of local requirements, the following codes appl :
The above codes are available from:
A. ANSI/NFPA - #70 National Electric Code
B. ANSI/NFPA - #211 Chimne s 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)
Batter March Park
Quinc , Massachusetts, 02269
http://www.nfpa.org
CSA International
8501 E. Pleasant Valle Road
Cleveland, OH 44134-5575
http://www.csa-international.org

RIVA HEAT ONLY MANUAL - REV B
9
The Riva Heat Onl is a high efficienc , non-condensing, wall mounted gas boiler
which provides central heat. The boiler features a gas valve which modulates the energ
input from 44,000 BTU/h to 108,000 BTU/h. The boiler is shipped full assembled with the
components listed on page 11. All units are pressure and combustion tested at the factor
prior to shipping.
Key Features:
• Wall mountable - saving valuable floor
space.
• Several flue options available
• Electronic spark ignition
• Safet 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 s stem.
• Frost protection - contains an integral
frost protection s stem to prevent frost
damage which can occur in areas
susceptible to ver cold weather
conditions.
• Boiler operation recognition s stem
- should the boiler not be used for
longer than 24 hours, it then performs
a controlled s stem 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
temperature to within ± 2 ºF
• Diagnostic information s stem
equipped with three LED diagnostic
lights for quick error assessment.
GENERAL
Height in 27.7
Width in 15.7
Depth in 12.8
Weight lb 79.4
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
1. General Information
2. Technical Information (M130.30CR)

RIVA HEAT ONLY MANUAL - REV B
10
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 0.64
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 262
Max Exhaust temperature °F 324
INJECTORS No. Size
Natural 14 130
Propane 14 89
GAS FLOW RATE
Gas Min Max
Natural ft³/h 48.7 121.1
Propane lb/h 2.23 5.55
ELECTRICAL
Voltage V 120
Frequenc Hz 60
Current A < 1.6
Power consumption W 176
FLUE GAS FIGURES
Gas Min Max
CO2 2.5% 7.2%
O2 16.5% 8.1%
2.Technical Information Cont.

RIVA HEAT ONLY MANUAL - REV B 11
Primary Components:
2
4
3
7
5
8
9
6
10
12
16
14
11
15
18
19
13
20 26
1
1. Pump
2. Pump vent plug
3. Automatic air purger valve
4. Modulation gas valve
5. Flame-detecting electrode
6. Ignition electrodes
7. Burner
8. Combustion chamber
9. Primar heat exchanger
10. Fan
11. Air pressure switch
12. Air switch pres. Test points
13. Safet thermostat
14. Modulation operator
15. Gas valve outlet pres. Test point
16. Gas valve inlet pres. Test point
17. Central heating expansion vessel
18. Central heating temp. Probe NTC
19. Central heating pressure relief valve
20. Primar circuit flow switch
21. Main circuit drain cock
22. B -pass valve
23. Venturi device
24. Flue outlet pipe
25. Air Intake Pipe
26. Control panel
27. Safet thermostat probe
28. Pressure reducing automatic fill valve
29. Backflow preventer
30. Gas suppl line cock
31. Water suppl inlet cock
3. Parts List

RIVA HEAT ONLY MANUAL - REV B
12
16
4
18
15
7
6
11 9
10
23
24
31
27
25
29
30
28
17
19
22
20
5
21
14
4. Internal Piping & Parts List
Note:
• Pressure Relief Valve (#19) should be piped to a drain or to the floor as close
as possible to a drain.
• This diagram is a graphical representation onl and is not drawn to scale. Do
not use for piping purposes.

RIVA HEAT ONLY MANUAL - REV B
13
e bk wh g bu rd
bk g
g
g
M
~
t
probe NTC
C.h. temperature
COM
NO
M
~
COM
NONC
123 bk
bubn
rd
rd
gn egwh
bu
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bk
bu
wh
gbugn e
bk bk
ggn e bu
bk
bk
bubu
bu
bu
rdbk
gg
L N
rd bu bn gn e gn e
gn e bubn
burd
gn e
Flow Switch
Primar Circuit Pump
Valve
Gas
External controls
terminal
block
Electric suppl
terminal
block
Fan Safet
Thermostat
Air Pressure
Switch
Ignition
Electrodes
Flame Detection
Electrode
bn - brown
bu - blue
bk - black
wh - white
rd - red
g - gre
e - ellow
gn e - green/ ellow
wh
g
rd
rd
bk
bu
bn
g
e wh burd
1
bk
rd
*
* ---> directl connected to the electronic ignition board
5. Electric Diagrams
Caution: Label all wires prior to disconnection when
servicing controls. iring errors can cause
improper and dangerous operation.
Verify proper operation after servicing

RIVA HEAT ONLY MANUAL - REV B
14
5.1 Seq ence of Operation

RIVA HEAT ONLY MANUAL - REV B
15
The installation location chosen must:
• Compl with all clearances listed below.
• Provide suitable location for the exhaust and intake venting.
• Not be installed in an unheated space.
• Compl 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 boiler is to be installed in an enclosed room with no fresh air intake, the room must
have proper vent louvers installed. There should be two louvers, place each within 12” of
the ceiling and floor respectivel . 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
When choosing an installation location insure the exhaust and intake pipes compl with
NFPA 54. The drawing on the next page illustrates the restrictions on exhaust locations.
3
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2
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6. Installation Location
Note: For boilers in an enclosed
space it is recommended to install
a CO detector in the boiler room.

RIVA HEAT ONLY MANUAL - REV B
16
The Exhaust Hood must be installed on the leeward side of house and conform to
the following guidelines:
1. The Vent hood shall not be less than 3 feet above an forced air inlet to the house.
2. The Vent hood shall not be less than 4 feet below, 4 feet horizontall , or 1 foot above
an door, window or gravit inlet into an building.
3. The Vent hood shall not be less than 2 feet from an adjacent building.
4. The Vent hood shall be not less than 7 feet above grade when located adjacent to
public walkwa .
5. The Vent hood shall be located so that flue gasses are not directed to jeopardize
people, overheat combustible structures, materials or enter buildings.
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.
7. Exha st 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 RESPONSABILIT
Y OF THE HOMEO NER TO KEEP THE VENT
TERMINAL CLEAR OF SNO AND ICE

RIVA HEAT ONLY MANUAL - REV B
17
After a suitable installation location is chosen, verify that the mounting wall is
properly braced and strong enough to support the 80 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 boiler to determine the location of the mounting
bracket. Securel mount the bracket 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 bracket, sized
for the hardware being used.
3. Mount the bracket to the wall. Be sure to level the bracket b adjusting the screw
in the vertical slot.
4. Pre-drill the remaining hole in the mounting bracket and secure the final screw.
5. Mark and drill the exhaust/intake pipe holes through the house. If ou are using a
coaxial pipe s stem, drill the hole marked A (ø 4”) in the drawing below and on the
paper template. If ou are using a separate pipe s stem drill holes marked B and
C (ø 3.25”) shown below as well as on the paper template.
6. Remove paper template and hang boiler on bracket.
ø3.1
ø3.1
ø4.0
15.7
7.9 3.7
9.8
7.6
A
B
C
27.6
0.6
4.5
4.5
1.0
0.8
5.1
4.6 2.8 3.2
13.0
9.3
5.8
A&B
C
Figure 8.1
8. Mo nting Bracket

RIVA HEAT ONLY MANUAL - REV B
18
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, the 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 boiler that was attached to a common vent s stem, the
common venting s stem is likel to be too large for proper venting of the appliances
remaining connected to it. To ensure the remaining appliances will function properl , 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 s stem placed in
operation, while the other appliances remaining connected to the common venting
s stem are not in operation.
A. Seal an unused openings in the common venting s stem.
B. Visuall inspect the venting s stem for proper size and horizontal pitch and
determine there is no blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
C. insofar as is practical, close all building doors and windows and all doors between
the space in which the appliances remaining connected to the common venting
s stem are located and other spaces of the building. Turn on clothes dr ers and
an appliance not connected to the common venting s stem. Turn on an exhaust
fans, such as range hoods and bathroom exhausts, so the will operate at
maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
D. Place in operation the appliance being inspected. Follow the lighting instructions.
Adjust thermostat so appliance will operate continuousl .
E. Test for spillage at the draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle, or smoke from a cigarette, cigar or
pipe.
F. After it has been determined that each appliance remaining connected to the
common venting s stem properl vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers and an other gas-burning
appliance to their previous condition of use.” (g) An improper operation of the
common venting s stem should be corrected so the installation conforms with the
National Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA B149, Installation Codes.
When resizing an portion of the common venting s stem, the common venting
s stem should be resized to approach the minimum size as determined using the
appropriate tables in Part 11 of the National Fuel Gas Code, ANSI Z223.1 and/or
CAN/CGA B149, Installation Codes.
9. Venting

RIVA HEAT ONLY MANUAL - REV B
19
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, mec anical-vent eating appliances or domestic ot water equipment, w ere
t e bottom of t e vent terminal and t e air intake is installed below four feet above grade t e following
requirements must be satisfied:
1. If t ere is not one already present, on eac floor level w ere t ere are bedroom(s), a carbon monoxide
detector and alarm s all be placed in t e living area outside t e bedroom(s). T e carbon monoxide
detector s all comply wit NFPA 720 (2005 Edition).
2. A carbon monoxide detector s all be located in t e room t at ouses t e appliance or equipment and
s all:
a. Be powered by t e same electrical circuit as t e appliance or equipment suc t at only one
service switc services bot t e appliance and t e carbon monoxide detector;
b. Have battery back-up power;
c. Meet ANSI/UL 2034 Standards and comply wit 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 if applicable, a Product-approved air intake must
be used. Installation s all be in strict compliance wit t e manufacturer’s instructions. A copy of t e
installation instructions s all remain wit t e appliance or equipment at t e completion of t e
installation.
4. A metal or plastic identification plate s all be mounted at t e exterior of t e building, four feet directly
above t e location of vent terminal. T e plate s all be of sufficient size to be easily read from a
distance of eig t feet away, and read “Gas Vent Directly Below”.
(b) For direct-vent appliances, mec anical-vent eating appliances or domestic ot water equipment w ere
t e bottom of t e vent terminal and t e air intake is installed above four feet above grade t e following
requirements must be satisfied:
1. If t ere is not one already present, on eac floor level w ere t ere are bedroom(s), a carbon monoxide
detector and alarm s all be placed in t e living area outside t e bedroom(s). T e carbon monoxide
detector s all comply wit NFPA 720 (2005 Edition).
2. A carbon monoxide detector s all:
a. Be located in t e room t at ouses t e appliance or equipment;
b. Be eit er ard-wired or battery powered or bot ; and
c. S all comply wit NFPA 720 (2005 Edition).
3. A Product-approved vent terminal must be used, and if applicable, a Product-approved air intake must
be used. Installation s all be in strict compliance wit t e manufacturer’s instructions. A copy of t e
installation instructions s all remain wit t e appliance or equipment at t e completion of t e
installation.
9. Venting Req irements for the State
of Massach ssetts

RIVA HEAT ONLY MANUAL - REV B
20
The Riva is a mechanical draft, side wall vented boiler. There are two 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.
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 be placed
in exhaust breech of fan on the top of the boiler (Fig. 9.1) according to the flue
configuration used.
If additional flue piping is need for a particular application, it can be ordered separatel in
3 feet increments. Depending on the final flue pipe length, an alternative restrictor ma be
required. Refer to the tables 9.1 for proper restrictor ring sizing
Figure 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 (in) and 1.65 (out) 38
From 3.30 to 39.40 (in+out) 41
Table 9.1
9.2 Fitting the flue system:
In general, it has to be taken in consideration that the horizontal sections of the flue
pipe must have an horizontal sloping not less than 1.5 degree (0.3 in per ft) away
from the boiler.
In the standard horizontal flue kit the flue pipe is angled within the air duct therefore the air
duct must be horizontall installed.
If one or more exstensions have to be used the must be adequatel 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 lenght towards the boiler is ensured.
9. Venting Cont.