Biasi Riva Plus User manual

BOILER INSTALLATION, O
PERATION
INSTRUCTIONS
Riva
PLUS
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.
80 Rochester AVE. Suite # 12
Portsmouth, NH 03801
Phone: [phone]
Fax: [phone]

Riva Plus Manual
2

Riva Plus Manual 3
Dear Customer:
Thank you for buying a Biasi Riva Plus Boiler System.
The Riva Plus is a high efficiency con ensing, wall mounte gas boiler which provi es central
heat supply water.
We realize that it is not possible to answer all questions about the Riva boiler system in this
manual. Rea ing this installation manual oes not make the rea er an expert in all aspects of
installation an operation, an oes not replace the nee for a qualifie , license heating
contractor. We urge you to contact your installing contractor or istributor if you are in
question about any aspect of your boiler's performance. Our main concern is that you are
satisfie with your boiler an its performance. We require that your contractor complete
efficiency tests using instruments.
The external controls an accessories liste in this manual (exclu ing those supplie insi e
the boiler) are inten e to serve as gui elines rather than specific recommen ations. We
realize that other makes an mo els of such evices are available an can be use as
successfully as those we specify. The installing contractor is the best ju ge of a system's
specific requirements, as well as the local availability of certain makes an mo els of controls
an accessories. The prece ing oes not apply, however, to the equipment that comes with
every boiler, such as the overheat control an 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 accor ance with the ASME boiler an pressure vessel
co e, an bear the "H" stamp. The Entire range of applications for the Riva boiler has been
teste to stan ar CSA 4.9 an is CSA compliant.
This Riva Plus boiler has a 2 year warranty, a copy of which is provi e with the boiler.
Please be sure to return the warranty registration car as the warranty will be voi without
your boiler's serial numbers (locate on the ratings label affixe to the boiler), ate of
installation an the name of your installer being on recor in our files.
Thank you for purchasing our Riva Plus boiler. If you have questions or comments, please
on't hesitate to contact us imme iately. Our goal is 100% customer satisfaction.
QHT inc.

Riva Plus Manual
4
Warnings - 6-7
Important Information - 8
General Information 1 9
Technical Information (M135.30CR) 2 9-10
Parts List 3 11
Internal Piping an 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
Venting Requirments for 9 19
the State of Massachusetts
Restrictor Sizing 9.1 20
Fitting the Flue System 9.2 20
Choice of Flue 9.3 21-26
Pipe Connections 10 27
Gas Pipe Connections 11 28
Electrical Connections/Wiring 12
Power Connection 12.1 29
Connection to the Electricity Supply 12.2 29
Room Thermostat Connection 12.3 30
Relay Panel Control Connection 12.4 30
Zone Valve Microswitch Connection 12.5 31
Circulator Sizing 13
Circ. Cap. as a Function of Flow Rate 13.1 32
Expansion Vessel 13.2 32
Piping 14 33
Primary-Secon ary Piping 14.1 34
Primary-Secon ary with Zone Valves 14.2 35
Manifol Piping with Zone Valves or Circ. 14.3 36
Table of Contents
Section Title Section N mber Page N mber

Riva Plus Manual 5
Commissioning 15
Initial Filling of the System 15.1 37
Lightning the Boiler 15.2 37
Checking the Gas Pres. at the Burner 15.3 38
A justment of the Gas Pressure 15.4 39
Checking the Ignition Device 15.5 39
Checking the Burner Ignition 15.6 40
A justment of the Useful c.h. Output 15.7 40
Labels Placement 15.8 41
Checking the Flue System an Comb. 15.9 42
Instructing the User 15.10 42
Gas Conversion 16 43
Annual Maintenance 17
Warnings 17.1 44
Dismantelling the External Panels 17.2 44
Emptying the C.h. System 17.3 44
Cleaning the Primary Heat Exch. 17.4 44
Checking the Pressuris. 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 45-46
Visual Inspection of Appliance 17.9 46
Gas Pressures an Soun ness 17.10 46
Con ensate trap 17.11 46
Venting Spare Parts 18
Separate Vent 18.1 47
Coaxial Vent 18.2 48
Roof Vent 18.3 49
Installer Notes 19 51
Table of Contents
Section Title
Section N mber
Page N mber

Riva Plus Manual
6
Boiler is certifie as an in oor appliance. Do not install boiler out oors or locate where
it will be expose 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 Plus Manual 7
Any appliance that burns natural gas, propane gas, fuel oil, woo or coal is capable of
pro ucing carbon monoxi e (CO). Carbon Monoxi e (CO) is a gas which is o orless,
colorless an tasteless but is very toxic. CO is lighter than air an thus may travel
throughout the buil ing.
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 inclu e the following:
izziness vision problems shortness of breath
hea ache loss of muscle control unclear thinking
nausea weakness unconsciousness
The symptoms of CO poisoning are often confuse with those of influenza, an the
highest inci ence of poisoning occurs at the onset of col weather or uring 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 in icate the presence of carbon monoxi e:
If any of the symptoms of CO occur, or if any of the signs of carbon monoxi e 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 smelly air.
• The presence of soot or carbon in or
aroun the appliance.
• Very high unexplaine humi ity insi e
• the buil ing.
• Hot gasses from appliance, venting
system pipes or chimney, escaping into
the living space.
• Flames coming out aroun the
appliance.
• Yellow colore flames in the appliance
WARNING

Riva Plus Manual
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 warranties 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 an relate equipment must conform to national, state an
local regulating agencies an co es applicable to the installation of the equipment. In the
absence of local requirements, the following co es apply:
The above co es are available from:
A. ANSI/NFPA - #70 National Electric Co e
B. ANSI/NFPA - #211 Chimneys an Vents
C. ANSI/NFPA - #Z223.1 National Fuel Gas Co e
C. ANSI/NFPA - Domestic Gas Conversion Burner
D. CAN/CGA - B149 Installation Co es
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 Roa
Clevelan , OH 44134-5575
http://www.csa-international.org

Riva Plus Manual 9
The Riva Plus is a high efficiency con ensing, wall mounte gas boiler which provi es central
heat. The boiler features a gas valve which mo ulates the energy input from
49476 BTU/h to 116008 BTU/h. The boiler is shippe fully assemble with the components
liste on page 11. All units are pressure an combustion teste at the factory prior to
shipping.
Key Features:
• Wall mountable - saving valuable
floor space.
• Several flue options available
• Electronic spark ignition
• Safety flow switch - positione on
the main circuit, which monitors the
flow an protects the main heat
exchanger from thermal shock
shoul there be a lack of water in
the system.
• Frost protection - contains an
integral frost protection system to
prevent frost amage which can
occur in areas susceptible to very
col weather con itions.
• Boiler operation recognition system
- shoul the boiler not be use for
longer than 24 hours, it then
performs a controlle system test
to ensuring the motorize
components within the boiler o not
become inoperable ue to lack of
use.
• Gas valve mo ulation - the gas
input mo ulates base off central
heating temperature to within ± 2 ºF
• Diagnostic information system
equippe with three LED iagnostic
lights for quick error assessment
GENERAL
Height in
31.6
Wi th in
15.8
Depth in
13.8
Weight lb
98.1
CENTRAL HEATING
Maximum working temp. °F
185
Temp. Regulation range* °F
100-176
Maximum pressure psi
30.0
Minimum pressure psi
4.35
Max hea loss (at 4.4 GPM) ft
8.3
*At the minimum useful output
1. Gene
ral Information
2. Technical Information (M135.30CR)

Riva Plus Manual
10
ENERGY CAPACITY
Nominal heat input
(0/2000ft) MBH 116.0
Nominal heat input
(2000/4500ft) MBH 110.2
Minimum heat input MBH 49.5
Maximum useful output
(0/2000ft) MBH 102.0
Maximum useful output
(2000/4500ft) MBH 97.2
Minimum useful output MBH 41.6
GAS SUPPLY PRESSURE
Gas Normal Min Max
Natural inwc 7.0 3.5 10.5
Propane inwc 11.0 8.0 13.0
GAS PRESSURE AT BURNER
Gas Min Max Ignition
Natural inwc 1.0 4.8 2.4
Propane inwc 2.0 10.3 5.1
FLUE DESIGN
Minimum Venturi pressure inwc 0.64
Flue pipe iameter
Coaxial in 2.25/4
3.25/5
Twin split pipes in 3.25/3.25
Nominal heat flow rate
(0/2000ft) MBH 116.0
Nominal heat flow rate
(2000/4500ft) MBH 110.2
in Exhaust temperature °F 130
Max Exhaust temperature °F 170
INJECTORS No. Size
Natural 14 130
Propane 14 85
GAS FLOW RATE
Gas Min Max
Natural ft³/h 48.7 115.1
Propane lb/h 2.23 5.25
ELECTRICAL
Voltage V 120
Frequency Hz 60
Current A 1.6
Power consumption W 180
FLUE GAS FIGURES
Gas Min Max
CO2 2.5% 6.3%
O2 16.5% 9.7%
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 free air in 0
2.Technical Information Cont.

Riva Plus Manual 11
Primary Components :
1.
Pump
2.
Pump vent plug
3.
Automatic air purger valve
4.
Mo ulation gas valve
5.
Flame- etecting electro e
6.
Ignition electro es
7.
Burner
8.
Combustion chamber
9.
Primary heat exchanger
10.
Fan
11.
Air pressure switch
12.
Air switch pres. Test points
13.
Safety thermostat
14.
Mo ulation 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.
Primary circuit flow switch
21.
Main circuit rain cock
22.
By-pass valve
23.
Venturi evice
24.
Flue outlet pipe
25.
Air Intake Pipe
26.
Control panel
27.
Safety thermostat probe
28.
Pressure re ucing automatic fill valve
29.
Backflow preventer
30.
Gas supply line cock
31.
Water supply inlet cock
32.
Con ensate trap
33.
Con ensing heat exchanger
34.
Flue termostat
3. Parts List
2
1
3
5
6
4
7
8
9
10
11
12
13
14
15
16
26
33

Riva Plus Manual
12
14
4
15
16
7
9
11
27
3
1
18
20
22
21
19
17
24
15
4. Internal Piping & Parts List
Note
: Pressure Relief Valve (#19) shoul be pipe to a rain or to the floor as lose as
possible to a rain.
5
c
10
25
32
33

Riva Plus Manual 13
ye bk wh gy bu r
bk gy
gy
gy
M
~
t
probe NTC
C.h. temperature
COM
NO
M
~
COM
NONC
123
bk
bubn
r
r
gnyegywh
bu
r
bk
bu
wh
gybugnye
bk bk
gygnye bu
bk
bk
bubu
bu
bu
rbk
gygy
L N
r bu bn gnye gnye
gnye bubn
bur
gnye
Flow Switch
pmuPtiucriCyramirP
Valve
Gas
External controls
terminal
block
Electric supply
terminal
block
ytefaS
naF Thermostat
Air Pressure
Switch
Ignition
Electro es
Flame Detection
Electro e
bn - brown
bu - blue
bk - black
wh - white
r - re
gy - grey
ye - yellow
gnye - green/yellow
wh
gy
r
r
bk
bu
bn
gy
ye wh bu r
bk
r
m m
Thermostat
Flue
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 Plus Manual
14
5.1 Seq ence of Operation

Riva Plus Manual 15
The installation location chosen must:
• Comply with all clearances liste below.
• Provi e suitable location for the exhaust an intake venting.
• Not be installe in an unheate space.
• Comply with all local co es an stan ar s.
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 installe in an enclose room with no fresh air intake, the room must have
proper vent louvers installe . There shoul be two louvers, place each within 12” of the
ceiling an 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
When choosing an installation location insure the exhaust an intake pipes comply with
NFPA 54. The rawing on the next page illustrates the restrictions on exhaust locations.
3
.
0
i
n
2
.
0
i
n
10.0
i
n
2
.
0
i
n
C
L
OSET INS
T
AL
L
A TION
M
I
N
I
M
U
M
P
E
R
M
A
N
A
N
T
C
L
E
ARAN CE
FR ON
T
V
I
E
S
I
D
E
V
I
E
C
L
OSE
T
IN
S
T
A
L
L
A TION
C
L
OSET INS
T
AL
L
A TION
SERV ICECL
E
ARANC
E
1
8
.
0
i
n
31.6 in
8 .0 in
1
5
.
8
i
n
15.2 in
Note
: For boilers in an enclose
space it is recommen e to install
a CO etector in the boiler room.
6. Installation Location

Riva Plus Manual
16
The Exhaust Hood must be installed on the leeward side of house and conform to the
following guidelines:
1. The Vent hoo shall not be less than 3 feet above any force air inlet to the house.
2. The Vent hoo shall not be less than 4 feet below, 1 foot horizontally, or 1 foot above any
oor, win ow or gravity inlet into any buil ing.
3. The Vent hoo shall not be less than 2 feet from an a jacent buil ing.
4. The Vent hoo shall be not less than 7 feet above gra e when locate a jacent to public
walkway.
5. The Vent hoo shall be locate so that flue gasses are not irecte to jeopar ize people,
overheat combustible structures, materials or enter buil ings.
6. Minimum of 6 feet horizontal clearance from electric meters, gas meters, regulators an
relief equipment.
7. All joints in system are to be sealed to prevent leakage of products of combustion
in the building.
8. Avoi installing exhaust hoo on the North, West, or the si e of the house receiving the
prevailing win s.
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 RESPONSABILITY OF THE HOMEO NER TO KEEP THE VENT
TERMINAL CLEAR OF SNO AND ICE

Riva Plus Manual 17
9. The vent shoul not be situate so that the flue gases are irecte towar s brickwork,
si ing, or other construction, in such a manner that may cause amage from heat or
con ensate from the flue gases
After a suitable installation location is chosen, verify that the mounting wall is properly
braced and strong enough to support the 110 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 provi e with the boiler to etermine the location of the mounting
bracket. Securely mount the bracket to the wall using appropriate har ware 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- rill two holes in the center of the “oval” slots on the mounting bracket, size for
the har ware being use .
3. Mount the bracket to the wall. Be sure to level the bracket by a justing the screw in
the vertical slot.
4. Pre- rill the remaining hole in the mounting bracket an secure the final screw.
5. Mark an rill the exhaust/intake pipe holes through the house. If you are using a
coaxial pipe system, rill the hole marke A (ø 4”) in the rawing below an on the
paper template. If you are using a separate pipe system rill holes marke B an C (ø
3.25”) shown below as well as on the paper template.
6. Remove paper template an hang boiler on bracket.
Figure 8.1
A B C
8.9
6.9 gas
6.5
7.9
15.2
27.6
9.6
15.8
7.7
Ø 4.0
1.9
2.9
7.9
2
1.4
4.5
5.6
0.6
1.2
1.4
4.6
2.5
2.6
10.1
3.9
2.4
2.4
Condense
A
C
8. Mo nting Bracket
31.6
Ø 3.1
Ø 3.1
B

Riva Plus Manual
18
The Riva is a mechanical raft, si e wall vente boiler. There are two si e wall flue options
available – separate an 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. Regar less of what vent kit is installe ,
they shoul all conform to the Provisions for combustion and ventilation air in accordance with
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. of CAN/CGA B149, Installation Codes, or applicable provisions of the local
building codes.
If the Biasi Riva replaces a boiler that was attache to a common vent system, the common
venting system is likely to be too large for proper venting of the appliances remaining
connecte to it. To ensure the remaining appliances will function properly, the test proce ure
below shoul be followe :
At the time of removal of an existing boiler, the following steps shall be followe with each
appliance remaining connecte to the common venting system place in operation, while
the other appliances remaining connecte to the common venting system are not in
operation.
(a) Seal any unuse openings in the common venting system.
(b) Visually inspect the venting system for proper size an horizontal pitch an etermine
there is no blockage or restriction, leakage, corrosion an other eficiencies which
coul cause an unsafe con ition.
(c) Insofar as is practical, close all buil ing oors an win ows an all oors between the
space in which the appliances remaining connecte to the common venting system are
locate an other spaces of the buil ing. Turn on clothes ryers an any appliance not
connecte to the common venting system. Turn on any exhaust fans, such as range
hoo s an bathroom exhausts, so they will operate at maximum spee . Do not operate
a summer exhaust fan. Close fireplace ampers.
( ) Place in operation the appliance being inspecte . Follow the lighting instructions.
A just thermostat so appliance will operate continuously.
(e) Test for spillage at the raft hoo relief opening after 5 minutes of main burner
operation. Use the flame of a match or can le, or smoke from a cigarette, cigar or pipe.
(f) After it has been etermine that each appliance remaining connecte to the common
venting system properly vents when teste as outline above, return oors, win ows,
exhaust fans, fireplace ampers an any other gas-burning appliance to their previous
con ition of use.” (g) Any improper operation of the common venting system shoul be
correcte so the installation conforms with the National Fuel Gas Code, ANSI Z223.1
an /or CAN/CGA B149, Installation Codes. When resizing any portion of the common
venting system, the common venting system shoul be resize to approach the
minimum size as etermine using the appropriate tables in Part 11 of the National
Fuel Gas Code, ANSI Z223.1 an /or CAN/CGA B149, Installation Codes.
9. Venting

Riva Plus Manual 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 mechanical-vent heating appliances or domestic hot water equipment where
the bottom of the vent terminal and the air intake is installed below four feet above grade the following
requirements must be satisfied:
1. If there is not one already present on each floor 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 if applicable a Product-approved air intake must be
used. Installation shall be in strict compliance with the manufacturer’s instructions. A copy of the
installation instructions shall remain with the appliance or equipment at the completion of the installation.
4. A metal or plastic identification plate shall be mounted at the exterior of the building four feet directly
above the location of vent terminal. The plate shall be of sufficient size to be easily read from a distance of
eight feet away and read “Gas Vent Directly Below”.
(b) For direct-vent appliances mechanical-vent heating appliances or domestic hot water equipment where
the bottom of the vent terminal and the air intake is installed above four feet above grade the following
requirements must be satisfied:
1. If there is not one already present on each floor 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 if applicable a Product-approved air intake must be
used. Installation shall be in strict compliance with the manufacturer’s instructions. A copy of the
installation instructions shall remain with the appliance or equipment at the completion of the
installation.
9. Venting Req irements for the State
of Massach ssetts

Riva Plus Manual
20
9. Venting Cont.