ECR International ARGO User guide

APPLICATION GUIDE
FOR
M U LTI PLE
GAS FIRED
HOT WATER BOILER
INSTALLATIONS
UP TO 4 UNITS
Manufactured by:
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. [phone]
www.ecrinternational.com
PN 240013666 REV. A [06/30/2022]

2PN 240013666 REV. A [06/30/2022]
Table of Contents
SAFETY INFORMATION ������������������������������������������������������������� 3-4
CODES AND STANDARDS ������������������������������������������������������������ 5
ENGINEERING AND DIMENSIONAL DATA�����������������������������������������6
BOILER RATINGS & CAPACITIES ��������������������������������������������������� 7
TYPICAL LAYOUTS FOR HOT WATER HEATING SYSTEMS����������������8-12
COMBUSTION AIR REQUIREMENTS ����������������������������������������������13
COMMON VENTING REQUIREMENTS���������������������������������������������14
VENTILATION AND COMBUSTION ������������������������������������������������15
VENT INSTALLATION������������������������������������������������������������������16
REMOVAL OF BOILER FROM VENTING SYSTEM�������������������������������17
GAS SERVICE ���������������������������������������������������������������������������18
OPTIONAL CONTROLS AND WIRING���������������������������������������������19
ARGO AMB CONTROLS ���������������������������������������������������������� 20-22

3PN 240013666 REV. A [06/30/2022]
NOTICE
Used to address practices not related to
personal injury�
CAUTION
Indicates a hazardous situation which, if not
avoided, could result in minor or moderate injury�
!!
WARNING
Indicates a hazardous situation which, if not
avoided, could result in death or serious injury�
!
DANGER
Indicates a hazardous situation which, if not
avoided, WILL result in death or serious injury
!
This is the safety alert symbol� Symbol
alerts you to potential personal injury
hazards� Obey all safety messages
following this symbol to avoid possible
injury or death�
Become familiar with symbols identifyingBecome familiar with symbols identifying
potential hazards.potential hazards.
WARNING
Fire, Explosion, Asphyxiation, Electrical shock
hazard! Flooding will result in damages such as
electrical problems, corrosion, inoperative parts,
mold and other unforeseen issues which can
occur over time� Any equipment determined by
a professional as damaged by a ood, dened as
excess of water or other liquid, shall be replaced�
Failure to follow these directions will result in a
Hazardous Situation�
!
FOR YOUR SAFETY READ BEFORE OPERATING
Hot Water Can Scald!
Water heated to temperature for clothes
washing, dish washing and other sanitizing
needs can scald and cause permanent injury�
Children, elderly, and inrm or physically
handicapped persons are more likely to be
permanently injured by hot water� Never leave
them unattended in bathtub or shower� Never
allow small children to use a hot water tap or
draw their own bath�
If anyone using hot water in the building ts the
above description, or if state laws or local codes
require certain water temperatures at hot water
taps, you must take special precautions:
• Use lowest possible temperature setting�
• Install some type of tempering device, such
as an automatic mixing valve, at hot water
tap or water heater� Automatic mixing valve
must be selected and installed according
to manufacturer's recommendations and
instructions�
• Water passing out of drain valves may be
extremely hot� To avoid injury:
Make sure all connections are tight�
Direct water ow away from any person.
DANGER
SAFETY INFORMATION

4PN 240013666 REV. A [06/30/2022]
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance�
• Do not touch any electrical switch; do not use
any phone in your building�
• Immediately call your gas supplier from a
neighbor’s phone� Follow gas supplier’s
instructions�
• If you cannot reach your gas supplier, call the re
department�
!!
SAFETY INFORMATION
WARNING
Construction materials of appliance and
products of combustion and fuel contain
alumina, silica, heavy metals, carbon monoxide,
nitrogen oxides, aldehydes and /or other toxic
or harmful substances which can cause death or
serious injury and which are known to the State
of California to cause cancer, birth defects and
other reproductive harm� Always use proper
safety clothing, respirators and equipment when
servicing or working nearby the appliance�
!
WARNING
Combustion chamber insulation in this product
contains ceramic ber material. Ceramic bers
can be converted to cristobalite in very high
temperature applications� The International
Agency for Research on Cancer (IARC) has
concluded, Crystalline silica inhaled in the
form of quartz or cristobalite from occupational
sources is carcinogenic to humans (Group1)�
Avoid breathing dust and contact with skin and
eyes. Use NIOSH certied dust respirator (N95).
This type of respirator is based on the OSHA
requirements for cristobalite at the time this
document was written� Other types of respirators
may be needed depending on the job site
conditions� Current NIOSH recommendations can
be found on the NIOSH website https://www�cdc�
gov/niosh/topics/silica/� approved respirators,
manufacturers, and phone numbers are also
listed on this website� Wear long-sleeved, loose
tting clothing, gloves, and eye protection. Apply
enough water to the combustion chamber lining
to prevent dust� Wash potentially contaminated
clothes separately from other clothing� Rinse
clothes washer thoroughly�
NIOSH stated First Aid� Eye: Irrigate immediately�
Breathing: Fresh air�
!
WARNING
This prod uct contains Fibrous glass� Fibrous
glass is a synthetic ber made from tiny particles
of glass. Fibrous glass has been classied as a
possible human carcinogen� When disturbed as a
result of servicing or repair, brous glass becomes
airborne and, if inhaled, may be hazardous to
your health� It can harm the eyes, skin, and the
lungs. Airborne bers from these materials have
been listed by the State of California as a possible
cause of cancer through inhalation� Adhere
to the following precautions and procedures�
Avoid breathing dust and contact with skin and
eyes. Use NIOSH certied dust respirator (e.g.,
N95)� Other types of respirators may be needed
depending on the job site conditions� Current
NIOSH recommendations can be found on the
NIOSH website https://www�cdc�gov/niosh/�
Approved respirators, manufacturers, and phone
numbers are also listed on this website� Wear
appropriate personal protective clothing to
prevent skin contact, as well as gloves and eye
protection� Wash skin daily at end of each work
shift, and prior to eating, drinking, smoking,
etc� Workers whose clothing may have been
contaminated should change into uncontaminated
clothing before leaving the work premises� Wash
potentially contaminated clothes separately from
other clothing� Rinse clothes washer thoroughly�
Follow all Local, State and Federal guidelines for
disposal�
NIOSH stated First Aid� Eye: Irrigate immediately�
Breathing: Fresh air�
!

5PN 240013666 REV. A [06/30/2022]
Installation shall be performed by a qualifed service
agency�
This instruction shall be used in conjunction with each
unit’s Installation, Operation and Maintanence Manual�
Installation shall conform to requirements of
authority having jurisdiction or in absence of such
requirements:
• United States
• National Fuel Gas Code, ANSI Z223�1/NFPA 54 .
• National Electrical Code, NFPA 70�
• Canada
• Natural Gas and Propane Installation Code,
CAN/CSA B149�1 and B149�2
• Canadian Electrical Code, Part I, Safety Standard
for Electrical Installations, CSA C22�1
Where required by authority having jurisdiction,
installation shall conform to Standard for Controls
and Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1.
Additional manual reset low water cuto may be required.
Additional manual reset high temp limit may be required�
Massachusetts:
Boiler installation must conform to Commonwealth of
Massachusetts code 248 CMR which includes but is not
limited to installation by licensed plumber or gas tter.
WARNING
Fire, explosion, asphyxiation and electrical shock
hazard� Improper installation could result in
death or serious injury� Read this instruction
and individual boiler’s Installation, Operation
& Maintenance Manual and understand all
requirements, including requirements of authority
having jurisdiction, before beginning installation�
Installation not complete until appliance operation
veried per Installation, Operation & Maintenance
Manual provided with each boiler��
!
CODES AND STANDARDS
Codes and Standards
WARNING
Keep boiler area clear and free from
combustible materials, gasoline and other
ammable vapors and liquids.
DO NOT obstruct air openings to the boiler
room�
Modication, substitution or elimination
of factory equipped, supplied or specied
components may result in personal injury or
loss of life�
TO THE OWNER - Installation and service of
this boiler must be performed by a qualied
installer�
TO THE INSTALLER - Leave all instructions with
boiler for future reference�
When this product is installed in the
Commonwealth of Massachusetts the
installation must be performed by a Licensed
Plumber or Licensed Gas Fitter�
!

6PN 240013666 REV. A [06/30/2022]
Engineering and Dimensional Data
“C”
“A” “B” “A” “B” “A”
FRONT VIEW
RIGHT SIDE VIEW
5-3/8”
36-3/8”
12-1/4”
4-3/4”
26-1/2”
2”
29”
5-7/16”
5”
13-1/2”
3-1/16”
Table 1
WARNING
Fire, explosion, asphyxiation and electrical shock hazard� Improper installation could result in death
or serious injury� Read this instruction and individual boiler’s Installation, Operation & Maintenance
Manual and understand all requirements, including requirements of authority having jurisdiction, before
beginning installation. Installation not complete until appliance operation veried per Installation,
Operation & Maintenance Manual provided with each boiler�
!
Figure 1 - Dimensional Data
MULTIPLE GAS FIRED HOT WATER BOILER ENGINEERING AND DIMENSIONAL DATA*
Boiler Size NUMBER OF
BOILERS
SHIPPING
WEIGHT
(TOTAL)
WATER
CONTENT
(GALLONS)
TOTAL**
DIMENSIONS IN INCHES
A B*** C
8 Section 2 1105 20�2 27�5 10 75
9 Section 2 1232 23�6 30�75 10 81�5
8 Section 3 1656 30�3 27�5 10 112�5
9 Section 3 1848 34�8 30�75 10 122�25
8 Section 4 2210 40�4 27�5 10 150
9 Section 4 2464 47�2 30�75 10 163
*Consult Individual Boiler Installation & Operation Manual for Additional Information
** Exclusive of Field Installed External Piping
*** Requires 4’ sensor wire (240007708) to relocate Hydrolevel 3200 control to front of boiler for
access� If control is left in original position 24”�

7PN 240013666 REV. A [06/30/2022]
Boiler Ratings & Capacities
BOILER RATINGS
Boiler Size NUMBER OF
BOILERS
TOTAL
RATED
INPUT
TOTAL
RATED HEAT
CAPACITY
TOTAL
NET AHRI
RATING
FLUE
OUTLET
DIAMETER,
INCHES
COMMON
VENT
DIAMETER,
INCHES
CHIMNEY
DIAMETER
AND
HEIGHT
8 Section 2 525 442 384 7 12 12" x 20'
9 Section 2 598 504 438 7 12 12" x 20'
8 Section 3 787�5 663 576 7 14 14" x 20'
9 Section 3 897 756 657 7 14 14" x 20'
8 Section 4 1050 884 768 7 16 16" x 20'
9 Section 4 1196 1008 884 7 16 16" x 20'
Table 2
FRONT VIEW
FLUE OUTLET FLUE OUTLET
COMMON VENT
NOTE: See Boiler Installation Operation and Maintenance Manual included in
Literature for specic boiler installation requirements.
Figure 2 - Front View Common Venting

8PN 240013666 REV. A [06/30/2022]
ACCESS*
FRONT
ACCESS*
10"MIN.*
(S)
(R)
(S)
(R)
(S)
(R)
(B)
SYSTEM
SUPPLY
SYSTEM
RETURN
(B)
Typical Layouts for Hot Water Heating Systems
Figure 3 - Room Sizing - Parallel Reverse Return (3 Boilers shown)
Note:
• Access *is minimum 24” service clearance�
• Vent position, relief valve location, supply and return piping will vary depending on type of units�
LEGEND - PIPE SIZING
(S),(R) - 1¼ NPT BOILER SUPPLY AND RETURN
(B) - HEADER SIZING - REFER TO TABLE 3
(Supply & Return at Same Wall of Boiler Room)

9PN 240013666 REV. A [06/30/2022]
Figure 4 - Three (3) Unit Conrguration Parallel Reverse Piping Room Sizing
Note:
• Access *is minimum 24” service clearance�
• Vent position, relief valve location, supply and return piping will vary depending on type of units�
LEGEND - PIPE SIZING
(S), (R) - 1¼ NPT BOILER SUPPLY AND RETURN
(B) - HEADER - REFER TO TABLE 3
Typical Layouts for Hot Water Heating Systems
10"MIN.*
ACCESS*
FRONT
(B)
(S)
(R)
(B) ACCESS*
RETURN
(R)
(S)
(R)
(S)
SUPPLY
ACCESS*
(Supply & Return at Opposite Walls of Boiler Room)

10 PN 240013666 REV. A [06/30/2022]
Typical Layouts for Hot Water Heating Systems
Figure 5 - Typical Layouts for Modular Gas Fired Systems - Up to 4 Boilers Parallel Piping
BOILER
#1
BOILER
#2
BOILER
#3
BOILER
#4
UP TO MAX. (INLINE)
OF 163"
TO FLOOR
DRAIN
(TYP)
(1 1/4")
(1 1/4")
SYSTEM
RETURN
UP TO 4 BOILERS
(B HEADER)
SYSTEM
SUPPLY
2
T
SYSTEM
TEMPERATURE
SENSOR
4
L
T1
HIGH
LIMIT
5
*
(B HEADER)
3
LEGEND
- Locate temperature sensor within 3 to 5 feet after supply header�
- Maximum overall length is based on using (4) boilers having largest
footprint and 24” minimum service clearance between units�
4- Low Water Cuto Shall be mounted above the supply tting of the
boilers�
5 - CSD-1 High Limit Shall be within 1’ (1 foot) of nearest boiler�
3
2
Note:
• Modules may be placed back to back to save space�
• Refer to gure 3 for header size.
*For sizing system or boiler circulators, apply 10 GPM per 100,000 BTU (net) output�

11 PN 240013666 REV. A [06/30/2022]
Figure 6 - Typical Layouts for Modular Gas Fired Systems - Up to 4 Boilers Reverse Parallel Piping
Typical Layouts for Hot Water Heating Systems
LEGEND
- Locate temperature sensor within 3 to 5 feet after supply header�
- Maximum overall length is based on using (4) boilers having largest footprint and 24” minimum service
clearance between units�
4- Low Water Cuto Shall be mounted above the supply tting of the boilers.
5 - CSD-1 High Limit Shall be within 1’ (1 foot) of nearest boiler�
2
3
BOILER
#1
BOILER
#2
BOILER
#3
BOILER
#4
T
SYSTEM
TEMPERATURE
SENSOR
UP TO MAX. (INLINE)
OF 163"
2
TO FLOOR
DRAIN
(TYP)
SYSTEM
SUPPLY SYSTEM
RETURN
UP TO 4 BOILERS
4
L
T1
HIGH
LIMIT
5
CHECK VALVE
SHUT OFF VALVE
CIRCULATOR
LEGEND
PIPE CONNECTION
TTEMPERATURE SENSOR -
SYSTEM
PRESSURE RELIEF VALVE
L
T1
MANUAL RESET LOW WATER
CUTOFF
MANUAL RESET HI LIMIT
LT1
&SHALL SHUTOFF ALL
BOILERS
FOR CSD-1
(B HEADER)
*
(B HEADER)
(1 1/4")
(1 1/4")
3
Note:
• Modules may be placed back to back to save space�
• Refer to gure 3 for header size.
*For sizing system or boiler circulators, apply 10 GPM per 100,000 BTU (net) output�

12 PN 240013666 REV. A [06/30/2022]
Table 3 - HYDRONIC PIPE SIZING GUIDE
COMBINED
BOILER
INPUT
(MBTUH)
(Fig. 4 & Fig. 6 ONLY)
MINIMUM PIPE SIZE (NPT)
(S), (R) HEADER (B)
525 1-1/4" 2"
600
790
900
1-1/4" 2-1/2"
1-1/4" 2-1/2"
1-1/4" 3"
1,050
1,200
1-1/4" 3"
1-1/4" 3"
Typical Layouts for Hot Water Heating Systems

13 PN 240013666 REV. A [06/30/2022]
Combustion Air Requirements
WARNING
Asphyxiation hazard� Do not obstruct air openings
to combustion area� Follow the chart below for
adequate combustion air� Failure to comply could
result in death or serious injury�
!
Table 4 - COMBUSTION AIR REQUIREMENTS
Boiler Size
NUMBER
OF
BOILERS
Total Rated
Input
*UNCONFINED AREA **CONFINED AREA
OUTSIDE COMBUSTION
Outside
combustion air 1
sq in/4000 BTU/hr
(See Fig 2
Inside combustion
air 1 sq in/1000
BTU/hr (See Fig 1)
Vert� Ducts
1 Sq� In�
/4000 Btuh/Hr
Horz� Ducts
1 Sq� In�
/2000 Btuh/Hr
8 Section 2 525 150 600 150 300
9 Section 2 598 150 600 150 300
8 Section 3 787�5 200 800 200 400
9 Section 3 897 225 900 225 450
8 Section 4 1050 275 1100 275 550
9 Section 4 1196 300 1200 300 600
* Unconned Area: A space whose volume is not less than 50 cubic feet per 1000 Btu per hour of all appliances installed in
that space (Cubic feet of space = height x width x length).
** Conned Area: A space whose volume is less than 50 cubic feet per 1000 Btu per hour of all appliances installed in that
space (Cubic feet of space = height x width x length).
Figure 7 - Combustion Air Openings Figure 8 - Combustion Air with Motorized Dampers
Refer to the individual boiler Installation, Operation and
Maintanence Manual�
Combustion Air Supplied From Inside the Building
Outside
Wall
Inside
Wall
Combustion Air Openings
with
Motorized Dampers
Combustion Air Supplied From Outside The Building

14 PN 240013666 REV. A [06/30/2022]
Common Venting Requirements
COMBINED
INPUT (BTUH)
x1000
Table 5 - COMMON VENT SIZING (INCHES)
Vertical Vent Height (Ft)
6’ 8’ 10’ 20’ 30’ 50’ 100’
550 12 12 12 10 9 9 8
600 14 12 12 12 10 9 9
790 14 14 14 12 12 10 9
900 16 14 14 12 12 12 10
1,050 16 16 16 14 12 12 12
1,200 18 18 16 14 14 12 12
COMMON VENT
DIAMETER
(INCHES)
MAXIMUM
HORIZONTAL
LENGTH
FEET [INCHES]
8 12�0 [144”]
9 13�5 [162”]
10 15�0 [180”]
12 18�0 [216”]
14 21�0 [252”]
16 24�0 [288”]
18 27�0 [324”]
Table 5 based on TYPE-B Double-Wall vent using un-assisted Common Vent system. Reference is NFPA-
54 / ANSI Z223.1 National Fuel Gas Code.
Consult NFPA-54 / ANSI Z223.1 National Fuel Gas Code. for “Mechanical Vent” Sizing and additional vent
information.
Maximum Horizontal Vent Length shall not exceed allowable [Common Header Vent Size x 18”]. See Table 6.
If longer Horizontal Vent Lengths are required – percentage reduction in capacity must be made to Table
values. Consult NFPA-54 / ANSI Z223.1 National Fuel Gas Code.
Table 5 - Common Vent Sizing Table for Multiple Boilers
Table 6 - Maximum Horizontal Length of Common Vent

15 PN 240013666 REV. A [06/30/2022]
1. Ventilation of the boiler room must be adequate to
provide suf1. cient air to properly support combustion
per the latest revision of the National Fuel Gas Code,
ANSI Z223�1/ NFPA-54�
2. When a boiler is located in an unconned space in a
building or conventional construction frame, masonry
or metal building, inltration normally is adequate to
provide air for combustion and ventilation� However,
if the equipment is located in a building of tight
construction (See the National Fuel Gas Code, ANSI
Z223�1) the boiler area should be considered as a
conned space. If there is any doubt, install air supply
provisions in accordance with the latest revision of the
National Fuel Gas Code�
3. When a boiler is installed in an unconned space, in a
building of tight construction, air for combustion and
ventilation must be obtained from outdoors or from
spaces freely communicating with the outdoors� A
permanent opening or openings having a total free area
of not less than 1 square inch per 5,000 BTU per hour
of total input rating of all appliances shall be provided�
Ducts may be used to convey makeup air from the
outdoors and shall have the same cross-sectional area
of the openings to which they are connected�
4. When air for combustion and ventilation is from inside
buildings, the conned space shall be provided with two
permanent openings, one starting 12 inches from the
top and one 12 inches from the bottom of the enclosed
space� Each opening shall have a minimum free area
of 1 square inch per one thousand (1000) BTU per
hour of the total input rating of all appliances in the
enclosed space, but must not be less than one hundred
(100) square inches� These openings must freely
communicate directly with other spaces of sucient
volume so that the combined volume of all spaces
meets the criteria for an unconned space. See Figure
#7.
5. When the boiler is installed in a conned space and all
air is provided from the outdoors the conned space
shall be provided with one or two permanent openings
according to methods A or B� When ducts are used,
they shall be of the same cross sectional area as the
free area of the area of the openings to which they
connect� The minimum dimension of rectangular air
ducts shall be not less than 3 x 3 inches or 9 square
inches�
A� When installing two openings, one must commence
within A� 12 inches from the top and the other
within 12 inches from the bottom of the enclosure�
The openings shall communicate directly, or by
ducts, with the outdoors or spaces (crawl or attic)
that freely communicate with the outdoors� One
of the following methods must be used to provide
adequate air for ventilation and combustion�
i� When directly communicating with the
outdoors, each opening shall have a minimum
free area of 1 square inch per 4,000 BTU per
hour of total input rating of all equipment in
the enclosure� See Figure #8.
ii� When communicating with the outdoors by
means of verII� tical ducts, each opening shall
have a minimum free area 1 square inch per
4,000 BTU per hour of total input rating of all
appliances in the enclosed space�
iii� If horizontal ducts are used, each opening
and duct shall III� have a minimum free area
1 square inch per 2,000 BTU per hour of total
input rating of all appliances in the enclosed
space�
B� One permanent opening, commencing within
12 inches of the top of the enclosure, shall be
permitted where the equipment has clearances
of at least 1 inch from the sides, 1 inch from the
back, and 6 inches from the front of the boiler�
The opening shall directly communicate with the
outdoors or shall communicate through a vertical or
horizontal duct to the outdoors or spaces (crawl or
attic) that freely communicate with the outdoors�
The openings must have a minimum free area of 1
square inch per 3000 Btu per hour of the total input
rating of all equipment located in the enclosure�
The free area must be no less than the sum of the
areas of all vent connectors in the conned space.
6. In calculating free area using louvers, grilles or screens
for the 6� above, consideration shall be given to their
blocking eect. Screens used shall not be smaller than
¼ inch mesh� If the free area through a design of
louver or grill is known, it should be used in calculating
the size opening required to provide the free area
specied. If the design and free area is not known, it
may be assumed that wood louvers will have 20-25%
free area and metal louvers and grilles will have 60-
75% free area. Louvers and grilles should be xed in
the open position or interlocked with the boiler so they
are opened automatically during the boiler operation�
Ventilation and Combustion

16 PN 240013666 REV. A [06/30/2022]
Vent Installation
WARNING
Asphyxiation hazard� This boiler is to be vented
by natural draft and shall not be connected to
the mechanical draft system operating under
positive pressure Failure to comply could result
in death or serious injury�
!
1. The vent pipe must slope upward from the boiler not
less then 1 inch� ¼ inch for every 1 foot to the vent
terminal�
2. Horizontal portions of the venting system shall be
supported rigidly every 5 feet and at the elbows� No
portion of the vent pipe should have any dips or sags�
3. This boiler series is classied as a Category 1 and
the vent installation shall be in accordance with the
National Fuel Gas Code noted above or applicable
provisions of the local building codes�
4. Inspect chimney to make certain it is constructed
according to NFPA 211� The vent or vent collector shall
be Type B or metal pipe having resistance to heat and
corrosion not less than that of galvanized sheet steel or
aluminum not less than 0�016 inch thick (No� 28 Ga)�
5. Connect ue pipe from draft hood to chimney. Bolt or
screw joints together to avoid sags� Flue pipe should
not extend beyond inside wall of chimney� Do not
install manual damper in ue pipe or reduce size of
ue outlet except as provided by the latest revision
of ANSI Z223�1� Protect combustible ceiling and walls
near ue pip with reproof insulation. Where two or
more appliances vent into a common ue, the area of
the common ue must be at least equal to the area
of the largest ue plus 50 percent of the area of each
additional ue.
VENT DAMPER INSTALLATION
NOTE: Refer to Figures 9 & 10 for steps 1-7
1. Place Vent Damper on or as close to vent outlet of
boiler as possible� See Figure #9�
2. Ensure each boiler is serviced by its’ own vent damper�
See Figure #10�
3. Ensure vent damper of each boiler will not interfer with
safe venting of other boilers� See Figure #10�
4. Clearance of not less than 6 inches between vent
damper and combustible material shall be maintained�
Additional clearance should be allowed to service of the
vent damper�
5. Refer to vent damper section of boiler IOM�
6. Vent damper shall be in the open position when
appliance main burners are operating�
7. The vent damper position indicator must be in a visible
location following installation�
LOCKNUT
HARNESS
CONN.
DAMPER
CONN.
INSTALLER
HOOK-UP
INSTALLER
HOOK-UP
DAMPER
MOTOR
DAMPER
VENT
OUTLET
VENT
ACCEPTABLE VENT
DAMPER LOCATIONS
UN-ACCEPTABLE
DAMPER LOCATIONS
BOILERS
HOT WATER HEATER
CHIMNEY
INSTALLATION INSTRUCTIONS FOR
POSITION OF DAMPER CONTROL BOX
X
REFER TO DAMPER MANUFACTURER'S
X
X
X
Figure 9
Figure 10

17 PN 240013666 REV. A [06/30/2022]
Removal of Boiler from Venting System
When an existing boiler is removed from a common venting
system, the common venting system is likely to be too
large for the proper venting of the appliances remained
connected to it� If this situation occurs, the following test
procedure must be followed:
REMOVAL OF BOILER FROM VENTING SYSTEM
At the time of removal of an existing boiler, the following
steps shall be 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�
1. Seal an unused opening in the common venting
system�
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other deciencies
which could cause an unsafe condition�
3. 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 system are located and other spaces of
the building� Turn on clothes dryers and any other
appliance not connected to the common venting
system� Turn on any exhaust fans, such as range
hoods and bathroom exhausts, so they operate at
maximum speed� Do not operate a summer exhaust
fan. Close replace dampers.
4. Place in operation the appliance being inspected�
Follow the lighting instructions� Adjust thermostat so
appliance will operate continuously�
5. Test for spillage at the draft hood relief opening after
5 minutes of main burner operation. Use the ame of
a match or candle, or smoke from a cigarette, cigar or
pipe�
6. After it has been determined that each appliance
remaining connected to a common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, replace dampers and
any other gas burning appliances to their previous
condition of use�
7. Any improper operation of the common venting system
should be corrected so the installation conforms with
the latest revision of the National Fuel Gas Code, ANSI
Z223�1� When re-sizing any portion of the common
venting system, the common venting system should be
re-sized to approach the minimum size as determined
using the appropriate tables in the latest revision of the
National Fuel Gas Code, ANSI Z223�

18 PN 240013666 REV. A [06/30/2022]
Gas Service
Table 7 - Pipe Sizes In Inches For Natural Gas Main
Boiler Size
NUMBER
OF
BOILERS
TOTAL
RATED
INPUT
RUN LENGTH IN FEET
20 30 40 50 60 80 100 125
8 Section 2 525 1.25" 1.25" 1.50" 1.50" 2.00" 2.00" 2.00" 2.00"
9 Section 2 598 1.25" 1.25" 1.50" 1.50" 2.00" 2.00" 2.00" 2.00"
8 Section 3 787�5 1.25" 1.50" 1.50" 2.00" 2.00" 2.00" 2.00" 2.00"
9 Section 3 897 1.50" 2.00" 2.00" 2.00" 2.00" 2.00" 2.50" 2.50"
8 Section 4 1050 1.50" 2.00" 2.00" 2.00" 2.00" 2.50" 2.50" 2.50"
9 Section 4 1196 2.00" 2.00" 2.00" 2.00" 2.50" 2.50" 2.50" 2.50"
See individual unit’s Installation, Operation & Maintenance
Manual for piping requirements�
Figure 11 - Gas Piping - Modular Boilers
Table based on pressure drop of 0�3” water column at less
then 2 psi inlet gas pressure�
Based on Natural gas and schedule 40 piping�
For other conditions and LP gas piping consult NFPA 54�
GAS MAIN
INSTALL MANUAL VALVE FOR
EACH BOILER WITHIN 6 FT� OF
BOILER OR WHERE REQUIRED BY
LOCAL CODE�
CHECK LOCAL CODE FOR
DISTANCE FROM FLOOR�

19 PN 240013666 REV. A [06/30/2022]
Optional Controls and Wiring
Following descriptions outline control options for modular
systems�
Argo AMB4B Multiple Boiler CONTROL
• AMB4B multiple boiler sequencers are capable of
sequentially step ring up to 4 (AMB4A) heating
boilers�
• The number of boilers red is adjusted by the AMB
control depending on system heating load and
outdoor temperature�
• AMB control will adjust control point of system water
temperature based on the temperature that the
outdoor air sensor is reading�
• Number of hours on each boiler in the system is
recorded and each day the AMB control will choose
the boiler with the fewest hours to be the lead boiler
for the day to attempt to run each boiler equally and
extend boiler life�
• Setpoint, reset ratio, rotation and many other
features are easily programmed in the led through
the four button user interface�
Operation
• When used in a continuous application the AMB
will regulate the water temperature in the system
through the use of the water sensor and it will always
keep the water warm�
• AMB will monitor the water temperature until the
temperature drops the number of degrees below the
control point that the temperature dierential feature
is set to�
• The control will then bring on the lead boiler� The
AMB will monitor the boiler temperature and if it has
not reached the control point it will bring on the next
boiler�
• Boilers will be phased on or o based on how close
the water temperature is to the control point�
• If at any point the water temperature is 10°F above
the control point, all boilers will turn o.

20 PN 240013666 REV. A [06/30/2022]
Argo AMB Controls
Consult ARGO AMB installation manual for additional information�
Model
Number Domestic / International Transformer Voltage
ARGO
AMB-4 Domestic 120V/60Hz/40Va
Figure 12 - Wiring ARGO AMB - 4 Control to Multiple Boilers