ECR International B Series User manual

GAS FIRED, CAST IRON
STEAM BOILERS
INSTALL ATION, OPER ATION
AND MAINTENANCE MANUAL
PN IM-BS2-01
[240009728, Rev. K 05/01/2021]
CAC/BDP
7310 West Morris St.
Indianapolis, IN. 48231
MODELS
BS2AAN000075 Series B
BS2AAN000112 Series B
BS2AAN000150 Series B
BS2AAN000187 Series B
BS2AAN000225 Series B
BS2AAN000262 Series B
BS2AAN000299 Series B

2
DIMENSIONS
Figure 1 - Dimensions
LEFT SIDE FRONT RIGHT SIDE
Gas Line
Rollout
Switch
Low Water
Cuto Probe
Spill
Switch
Pressure
Gauge
Water
Line
Low Water
Cuto
Glass
Gauge
Gas
Valve
2.5 OD
2.5 ODTransformer
24.00"
36.375"
CG400
Pressure
Limit
Control
26.50"
4.75"
*Vent
Damper
ASME
Relief
Valve
12.25"
29"
A
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]
BOILER MODEL NUMBER Dimensions (Inches) Boiler Water Volume
NAT GAS PROPANE Flue Diameter "A" Width*
Maximum
Boiler Water
Volume
Gallons
Minimum
"Below" Low
Water Cuto
Gallons
BS2AAN000075 BS2AAP000070 5 11¼ 2.6 1.8
BS2AAN000112 6 14½ 3.8 2.7
BS2AAN000150 6 17¾ 5 3.7
BS2AAN000187 7 21 6.2 4.7
BS2AAN000225 7 24¼ 7.4 5.7
BS2AAN000262 7 27½ 8.6 6.7
BS2AAN000299 7 30¾ 9.5 7.7
*Add 5½" to height for Vent Damper

3
RATINGS AND CAPACITY
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]
Table 1 - Ratings and Capacities
BOILER MODEL
NUMBER
No. of
Sec.
†Natural Gas
Fuel Type Input
*MBTUH
Heating
Capacity
*MBTUH
AFUE(%) Net AHRI
Rating *Mbh
Net AHRI
Rating Sq. Ft.
BS2AAN000075
3
Natural Gas 75 62 82.7 47 195
BS2AAP000070 Propane 70 58 82.7 44 183
BS2AAN000112 4 Natural Gas 112 91 82.0 68 283
BS2AAN000150 5 Natural Gas 150 122 82.0 92 383
BS2AAN000187 6 Natural Gas 187 153 82.0 115 479
BS2AAN000225 7 Natural Gas 225 183 82.0 137 570
BS2AAN000262 8 Natural Gas 262 214 82.0 161 670
BS2AAN000299 9 Natural Gas 299 245 82.0 184 766
* MBH = 1,000 Btuh. Btuh = British Thermal Unit Per Hour.
† For altitudes above 2,000 ft. reduce input rate 4% for each 1,000 ft. above sea level.
Heating Capacity is based on DOE (Department of Energy) test procedure.
Net AHRI steam Ratings shown are based on a piping and pickup allowance of 1.333.
Base selection of boiler size on "Net AHRI Rating" being equal to or greater than installed radiation in square feet.
Consult manufacturer before selecting a boiler for installations having unusual piping and pickup requirements,such as
intermittent system operation, exhaust piping systems, etc.

4
Dimensions....................................................... 2
Ratings and Capacity ......................................... 3
Table of Contents............................................... 4
Important Safety Information.............................. 5
Locating the Boiler............................................. 7
System Piping ................................................... 8
Installation - System Piping .............................. 11
Fresh Air for Combustion .................................. 12
Chimney and Vent Pipe Connection .................... 13
Vent Damper Operation .................................... 15
Gas Supply Piping............................................ 16
Electrical Wiring .............................................. 17
Operating Instructions...................................... 18
Operating Your Boiler ....................................... 19
Checking and Adjusting .................................... 20
Start-up Cleaning ............................................ 22
General Maintenance........................................ 23
Service Hints .................................................. 24
Electrical Wiring .............................................. 25
Controls and Accessories .................................. 27
Appendix A - Vent Damper ........................... 28
Appendix A - Vent Damper TroubleShooting. 29
Repair Parts ................................................. 31
TABLE OF CONTENTS
KEEP THIS MANUAL NEAR BOILER
RETAIN FOR FUTURE REFERENCE
GAS FIRED STEAM BOILERS
Information and specications outlined in this manual in eect at the
time of printing of this manual. Manufacture reserves the right to
discontinue, change specications or system design at any time without
notice and without incurring any obligation, whatsoever.
Introduction
Boiler is designed for use in closed heating systems where
all steam is returned as condensate and make-up water is
minimal. Boiler is not designed for or intended for use in
open systems using 100% make-up water.
Prior to Installation
• Verify correct boiler for type of gas being used
natural or propane. See Rating Plate.
• Verify boiler size and dimensions. See Figure 1, page
2.
• Verify ratings and capacity data for natural gas. See
Table 2 page 3.
Installation Requirements
• Supply boiler with correct gas (natural or propane),
fresh air for combustion, and suitable electrical supply.
• Connect boiler to adequate venting and piping
systems.
• Provide boiler with properly located and adjusted
thermostat.
Installation of boiler in building under construction, use
precaution to insure clean combustion air supply during
construction process. Airborne particulate from construction
materials can clog burner ports and cause incomplete
combustion and sooting.
Complete all steps for safe and proper heating system
operation.
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

5
IMPORTANT SAFETY INFORMATION
General
Boiler and venting installation shall be completed by
qualied agency.
Become familiar with symbols identifying potentialBecome familiar with symbols identifying potential
hazards.hazards.
This is the safety alert symbol. Symbol alerts you to This is the safety alert symbol. Symbol alerts you to
potential personal injury hazards. Obey all safety messages potential personal injury hazards. Obey all safety messages
following this symbol to avoid possible injury or death.following this symbol to avoid possible injury or death.
Installation shall conform to requirements of
authority having jurisdiction or in absence of such
requirements to the National Fuel Gas Code, ANSI
Z223.1/NFPA 54.
Where required by authority having jurisdiction,
installation shall conform to Standard for Controls
and Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1. Controls can be added to make
this boiler CSD-1 compliant. Check with your local
codes for requirements.
Requirements for Commonwealth of 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.
CAUTION
Laceration, burn hazard. Metal edges and parts
may have sharp edges and/or hot. Use appropriate
personal protection equipment to include safety
glasses and gloves when installing or servicing this
boiler. Failure to follow these instructions could result
in minor or moderate injury.
!!
WARNING
Fire, explosion, asphyxiation and electrical shock
hazard. Improper installation could result in death
or serious injury. Read this manual and understand
all requirements before beginning installation.
!
WARNING
Installing or venting a boiler or any other gas
appliance with improper methods or materials could
result in death or serious injury due to re or to
asphyxiation from poisonous gases such as carbon
monoxide which is odorless and invisible.
!
WARNING
Fire, explosion, asphyxiation hazard. Keep boiler
area clear and free from combustible materials,
gasoline and other ammable vapors and liquids.
Modication, substitution or elimination of factory
equipped, supplied or specied components could
result in death or serious injury.
!
CAUTION
Indicates a hazardous situation which, if not avoided,
may result in minor or moderate injury.
!!
NOTICE
Used to address practices not related to personal
injury.
DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in death or serious injury.
!
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
!
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.
!
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

6
IMPORTANT SAFETY INFORMATION
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 http://www.cdc.gov/niosh/homepage.html.
NIOSH 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.
!
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
!
Water
Temperature
Seng
1st Degree Burn
Exposure Time For
An Adult
2nd and 3rd Degree Burn
Exposure Time For An
Adult
120° F 1 minute 5 minutes
130° F 5 seconds 30 seconds
140° F 2 seconds 5 seconds
150° F 1 second 1.5 seconds
160° F Instantaneous 0.5 seconds
Note: Warning for Infants, Children, and Elderly:
Great care must be taken when exposing the
aforementioned groups to warm or hot water as they
can be badly burned in exposure times less than half
of the time for an adult.
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

7
LOCATING THE BOILER
Locating the Boiler
1. Select level location as centralized with piping system,
and as near chimney as possible.
2. Place crated boiler at selected location. Remove all
crate material. Please recycle responsibly.
WARNING
Fire hazard. Do not install boiler on combustible
ooring or carpeting. Failure to follow these
instructions could result in death or serious injury.
!
3. Do not install boiler on carpeting. For installation
on non-combustible oors only. For installation on
combustible ooring, special base must be used. (See
Replacement Parts Manual.)
4. Use metal shims under boiler base legs for nal leveling
if needed.
5. Install boiler in location that permits satisfactory
combustion of gas, proper venting, and maintenance
of ambient temperature at safe limits under normal
conditions of use. Boiler location should not interfere
with proper circulation of air. Introduce outside air
if normal inltration does not provide necessary
air.“Fresh Air for Combustion” on page 12.
6. Notify owner to keep air passages free of obstruction.
Ventilating and combustion air must enter boiler room
without restrictions.
7. Install boiler so automatic gas ignition system
components are protected from water (dripping,
spraying, rain, etc.) during appliance operation and
service.
Draft Hood Installation
WARNING
Asphyxiation, carbon monoxide hazard. Failure to
follow these instructions could result in improper
combustion and possible leakage of combustion
products into the living space.
!
Mount vent damper. See "Connecting Vent Damper and
Vent Connector" page 15. See Wiring Diagrams pages 24
and 26.
Table 2-
Minimum Clearance Dimensions
Top 6"
Rear 6"
Control Side 7"
Opposite Side 6"
Front Alcove
Flue/Vent Connector 6"
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

8
SYSTEM PIPING
Check local codes
for maximum
distance from
oor or other
allowable safe
point of discharge
Safety Valve
Discharge Piping
6" Above Floor
Figure 2 - Safety Valve
Safety Relief Valve Installation instructions:
• Connect to safety valve outlet. Piped down to safe
point of disposal. Check local codes for maximum
distance from oor or allowable safe point of discharge.
• Pipe size be of equal to or greater than of safety valve
outlet over entire length of discharge line.
• Have no intervening shuto valve between safety valve
and discharge to atmosphere. Do not plug or place any
obstruction in discharge line.
• Size and arrange discharge piping to avoid reducing
safety relief valve relieving capacity below minimum
relief valve capacity stated on rating plate.
• Terminate freely to atmosphere where any discharge
will be clearly visible and at no risk of freezing.
• Allow complete drainage of valve and discharge line.
WARNING
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per the following instructions.
Failure to follow these instructions could result in death
or serious injury .
!• Install safety valve with spindle in vertical position.
• Do not install shuto valve between boiler and safety
valve.
• Install union, if used, close to safety relief valve outlet.
• Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used)
• Support safety valve discharge piping.
• Run pipe as short and straight as possible to location
protecting user from scalding and properly drain piping.
• Terminate with plain end, not threaded.
• Size and arrange discharge piping to avoid reducing
safety relief valve relieving capacity below minimum
relief valve capacity stated on rating plate.
• Constructed of material suitable for exposure to
temperatures of 375° F (191°C); or greater.
Refer to local codes and appropriate ASME Boiler
and Pressure Vessel Code for additional installation
requirements.
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

9
SYSTEM PIPING
Consider near boiler piping as part of the boiler for proper
water level control and to produce dry steam.
Correct near boiler piping is crucial to proper operation of
boiler and heating system.
Follow these recommendations carefully.
1. Place boiler in selected location as near chimney as
possible.
2. Install safety valve. Figure 2 and Warning on Page 8.
• Install union, if used, close to safety valve outlet.
• Install elbows close to safety valve outlet and
downstream of union (if used).
3. Boiler is equipped with two 2½" supply connections
and two 2½" return connections, one each on both left
and right sides of boiler. Plug unused connections with
furnished 2½" plug (furnished).
4. When using both supply tappings to pipe system as
shown in Figure 4, Page 11.
• Fit headers with header osets, swing joints, or equip
with expansion joints, so thermal expansion and
contraction of header does not damage boiler. Do not
weld headers.
• Place system takeos from header between equalizer
and riser to header nearest equalizer. System takeos
must never be between two risers. If steam main goes
in two directions, place two takeos from header, one
for each main.
5. System takeos from the header must never be
bullheaded. If the steam main goes in two directions,
there must be two takeos from the header, one for each
main.
6. All boilers in gravity return systems must be equipped
with a Hartford Loop as shown in Figures 3 and 4.
7. When piping the vertical risers from the boiler to the
header, the bottom of the header must be a minimum
of 24 inches above the water level line on the right side
of the boiler.
8. Steam riser(s) and header shall be 2½” pipe size.
9. Equalizer line shall be minimum 1½” pipe size.
10. The near boiler piping shall include a 2½” tee with a
plug located on the supply line as shown for skimming
(i.e. surface blowdown).
11. The near boiler piping shall include a 1-1/2 ball valve
in the return piping as shown for bottom blowdown and
draining.
12. For gravity return systems, the bottom of the lowest
steam carrying pipe, be it a dry return, or the end of the
steam main, must be at least 28” above the normal water
level line on the right side of the boiler. This is known as
“Dimension A.”
13. For pumped return systems, follow the condensate
pump or boiler feed pump manufacturer’s instructions
for proper installation and hookup.
14. In connecting the cold water supply to the water inlet
valve, make sure that a clean water supply is available.
When the water supply is from a well or pump, a sand
strainer should be installed at the pump.
For Use With Cooling Units
Install boiler, when used in connection with refrigeration
system, so chilled medium is piped in parallel with the
boiler with appropriate valves to prevent chilled medium
from entering the boiler. See Figure 5.
Water Quality
• Do not use softened water in steam boilers. Accelerated
boiler corrosion will result.
• Consult local water treatment companies for unusually
hard water area (above 7 grains hardness) or low
pH water conditions. Boiler water pH of 7 to 8.5 is
manufacturer recommended.
Excessive Make-Up Water
A leaky system will increase the volume of make-up water
supplied to the boiler, which can signicantly shorten the
life of the boiler.
Make-up water contains dissolved minerals, salts, and
oxygen. When fresh, cool make-up water is heated in the
boiler, minerals fall out as sediment. Salts coat the inside
of the boiler, and oxygen escapes as a gas.
The accumulation of sediment eventually isolates the water
from contacting the cast iron. When this happens the cast
iron in that area gets extremely hot and eventually cracks.
The presence of free oxygen or chloride salts in the boiler
corrodes the cast iron from the inside. More make-up water
and higher concentrations of contaminants damage the
boiler and shorten the boiler's service life.
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

10
SYSTEM PIPING
Figure 3 - Recommended Near Boiler Piping Using One Supply Tapping [3 & 4 Section Sizes]
Dry Return Main
Main Vent
6" to 10"
Reducing Elbow Pointing
Down
1½" Min. Pipe
Size
28" Min. - Dimension A
15" Min.
Close Nipple
6"
24"
Min.
2½" Tee with
Plug for Skimming
24"
Water Line
Flue Collar
ASME Safety Valve
Pipe Full Size Same as
Boiler Tapping
(2½")
15"
Min.
Steam Mains
HARTFORD LOOP
Wet Return
Water Feed
Gate Valve (not furnished)
Drain Valve (furnished) for
Flushing system
1½" Full Port Ball Valve for Bottom Blow Down and
Draining Boiler and System (not furnished)
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

11
INSTALLATION - SYSTEM PIPING
VALVES A & B OPEN FOR HEATING; CLOSE FOR COOLING
VALVES C & D CLOSE FOR HEATING; OPEN FOR COOLING
Figure 4 - Recommended Near Boiler Piping Using Two Supply Tapping [5 Thru 9 Section Sizes]
Figure 5 - Chilled Water Piping
1½" Full Port Ball Valve
for Bottom Blow Down and
Draining Boiler and System (not
furnished)
28" Min. - Dimension A
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

12
FRESH AIR FOR COMBUSTION
WARNING
Air openings to combustion area must not be
obstructed. Follow instructions below, to maintain
adequate combustion air
!
Provide combustion air and ventilation air in accordance
with the section “Air for Combustion and Ventilation,” of the
National Fuel Gas Code, ANSI Z223.1 / NFPA 54, or
applicable provisions of local building codes.
Provide make-up air where exhaust fans, clothes dryers,
and kitchen ventilation equipment interfere with proper
operation.
National Fuel Gas Code recognizes several methods
of obtaining adequate ventilation and combustion air.
Requirements of the authority having jurisdiction may
override these methods.
• Engineered Installations. Must be approved by authority
having jurisdiction.
• Mechanical Air Supply. Provide minimum of 0.35
cfm per Mbh for all appliances located within space.
Additional requirements where exhaust fans installed.
Interlock each appliance to mechanical air supply
system to prevent main burner operation when
mechanical air supply system not operating.
• All Indoor Air. Calculate minimum volume for all
appliances in space. Use a dierent method if minimum
volume not available.
A. Standard Method. See Table 2 for space with natural
gas boiler only. Use equation for multiple appliances
and/or propane.
Room Volume is greater than 50 cubic feet multiplied
by Total Input [Mbh]
B. Known Air Inltration Rate. See Table 3 for
space with boiler only. Use equation for multiple
appliances. Do not use an air inltration rate air
changes per hour (ACH) greater than 0.60.
Room volume is greater than 21 cubic feet divided by
ACH (air changes per hour) x Total Input [Mbh]
C. Refer to National Fuel Gas Code for opening
requirements between connected indoor spaces.
• All Outdoor Air. Provide permanent opening(s)
communicating directly or by ducts with outdoors.
A. Two Permanent Opening Method. Provide opening
commencing within 12 inches of top and second
opening commencing within 12 inches of bottom of
enclosure.
Direct communication with outdoors or
communicating through vertical ducts. Provide
minimum free area of 1 in² per 4 Mbh of total
input rating of all appliances in enclosure.
Communicating through horizontal ducts.
Provide minimum free area of 1 in² per 2
Mbh of total input rating of all appliances in
enclosure.
B. One Permanent Opening Method. Provide opening
commencing within 12 inches of top of enclosure.
Provide minimum clearance of 1 inch on sides/back
and 6 inches on front of boiler (does not supersede
clearance to combustible materials).
C. Refer to National Fuel Gas Code for additional
requirements for louvers, grilles, screens and air
ducts.
• Combination Indoor and Outdoor Air. Refer to National
Fuel Gas Code for application information.
Table 3 - Minimum Room Volume, Indoor Air Only*
Input Mbh Standard
Method
Known Air Inltration Rate Method (Air Changes Per Hour)
0.1 0.2 0.3 0.4 0.5 0.6
75 3750 15750 7875 5250 3938 3150 2625
112.5 5625 23625 11813 7875 5906 4725 3938
150 7500 31500 15750 10500 7875 6300 5250
187 9350 39270 19635 13090 9818 7854 6545
225 11250 47250 23625 15750 11813 9450 7875
262.5 13125 55125 27563 18375 13781 11025 9188
299 14950 62790 31395 20930 15698 12558 10465
* Table values based on boiler only. Add volume for any additional appliances.
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

13
CHIMNEY AND VENT PIPE CONNECTION
Boiler and venting installations shall be performed
in accordance with "Venting of Equipment", of the
National Fuel Gas Code, ANSI Z223.1/NFPA 54, or
applicable provisions of the local building codes.
Chimney Inspection
Chimney must be clean, sized correctly, properly
constructed and in good condition.
Installation must conform to requirements of the authority
having jurisdiction or, in absence of such requirements, to
the National Fuel Gas Code, ANSI Z223.1/NFPA 54. See
Figure 6, page 14.
Connecting The Vent Damper And Vent Connector
Refer to Figure 1 for the size and location of the vent (ue
opening). Use a 28 gauge (minimum) galvanized pipe to
connect to the chimney.
Furnished vent damper blade has 1/2 square inch hole
(approximately 3/4” diameter). Boilers equipped with
intermittent ignition, plug hole using plug supplied with
vent damper.
1. Position furnished vent damper on top of ue outlet
collar. Fasten damper securely to ue outlet collar
with sheet metal screws. Make sure damper blade has
clearance to operate inside of diverter. Do not modify
draft diverter or vent damper
As An Option
Damper may be installed in any horizontal or vertical
position, closer to ue outlet collar preferred. See
Figures 7, 8 and 9.
2. Install vent damper to service single boiler only for
which it is intended. Damper position indicator shall be
in visible location following installation. Locate damper
so it is accessible for servicing.
3. Damper must be in open position when appliance main
burners are operating.
4. Boiler is equipped with factory wired harness that plugs
into vent damper. Connect thermostat to black wires
marked 24 volt thermostat on boiler.
5. Vent pipe must be same size as ue outlet collar.
6. Slope pipe up from boiler to chimney not less than 1/4”
per foot.
7. Run pipe as directly as possible with as few elbows as
possible.
8. Do not connect to replace ue.
9. End of vent pipe must be ush with inside face of
chimney ue. Use sealed-in thimble for chimney
connection.
10. Horizontal run should not be longer than 3/4 the
chimney height (HT). See Figure 6.
Vent Pipe
• Fasten sections of vent pipe with 3 sheet metal screws
at each joint to make piping rigid.
• Support horizontal portions of vent system to prevent
sagging.
• Use stovepipe wires or metal strapping every 5’ to
support pipe from above.
• Vent pipe through crawl space, use double wall vent
pipe.
• Vent pipe passing through combustible wall or partition,
use ventilated metal thimble. Thimble should be 4"
larger in diameter than vent pipe.
NOTICE
Minimum Vent Pipe Clearance - Wood and other
combustible materials must not be closer than 6” from
any surface of single wall metal vent pipe. Listed Type
B vent pipe or other listed venting systems shall be
installed in accordance with their listing.
Removing Existing Boiler From Common Venting
System
When an existing boiler is removed from a common
venting system, the common venting system is likely to be
too large for proper venting of the appliances remaining
connected to it.
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 any unused openings 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 appliance not connected
to the common venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhausts, so
they will operate at maximum speed. Do not operate a
summer exhaust fan. Close replace dampers.
WARNING
Installing or venting a boiler or any other gas
appliance with improper methods or materials could
result in death or serious injury due to re or to
asphyxiation from poisonous gases such as carbon
monoxide which is odorless and invisible.
!
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

14
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 the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, replace dampers and
any other gas-burning appliance to their previous
conditions of use.
7. Any improper operation of the common venting system
should be corrected so the installation conforms with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
When resizing any portion of the common venting
system, the common venting system should be resized
to approach the minimum size as determined using the
appropriate tables in Chapter 13 of the National Fuel
Gas Code, ANSI Z223.1/NFPA 54.
Vent connectors serving appliances vented by natural draft shall
not be connected into any portion of mechanical draft systems
operating under positive pressure.
CHIMNEY AND VENT PIPE CONNECTION
3 FT (914mm)
MIN.
2 FT (610mm)
MIN.
Figure 6 - Typical Masonry Chimney
Requirements
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

15
VENT DAMPER OPERATION
Figure 7 - Horizontal Installation
Check vent damper and all ue product carrying
areas of boiler annually for deterioration from
corrosion or other sources. If you see corrosion or
other deterioration, contact your service agent for
repairs.
Check vent damper operation as follows:
1. When boiler is o, check vent damper positions
indicator points to closed position. See Figure 9.
2. Turn thermostat or controller up to call for heat and
check vent damper indicator points to open position
See Figure 9.
3. Turn thermostat or controller down again and check
damper position indicator returns to closed position.
4. Return thermostat to desired position.
Inspect vent damper at least once a year by
trained service technician.
Manual Operation of Vent Damper
• Place vent damper in open position to permit burner
operation by using “HOLD DAMPER OPEN” switch,
located on damper controller.
• Thermostat controls burner ring as before, while
damper remains open.
• DO NOT turn damper open manually, motor damage
will result.
• Set switch to “AUTOMATIC OPERATION” to close vent
damper during burner o cycle.
• For further information, and for vent damper
troubleshooting guide, refer to manual packaged
with vent damper and Appendix A of this manual and
literature packaged with vent damper.
To BoilerVent Damper To
Chimney
NO
NO
YES YES
Flow
Install vent damper
with actuator to sides
of vent only. Do not
mount above or below
vent.
To
Chimney
Flow Vent Damper
To Boiler
Actuator may
be installer in
any position.
Figure 8 - Alternate Vent Damper Installation
Do Not
Install
Here
Caution: Do not
install Vent Damper
within 6" (152mm)
of combustible
material
Install Damper Here
Chimney
Boiler
Figure 9 - Vent Damper Position Indicator
Flue Gas
Flow
Flue Gas Flow
OPEN
CLOSED
ROTATION
CLOSED
OPEN
ROTATION
Damper Closed Damper Open
Showing Open and Closed Positions
Vent Damper Installation - Follow all cautions and
notes.
• Install vent damper to service only single appliance for
which it is intended.
• Do not install vent damper with 6" (15mm) of
combustible material.
• Do not install vent damper on vent pipe curve.
• Do not run wires near high temperature surfaces. Use
stando brackets if necessary.
• Install vent damper with actuator to sides of vent
only. Do not mount above or below vent.
WARNING
Asphyxiation or burn hazard. Improper operation of
vent damper may result in serious injury or death
due to re or to asphyxiation from poisonous gases
such as carbon monoxide which is odorless and
invisible.
!
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

16
GAS SUPPLY PIPING
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.
!!
General
• Use piping materials and joining methods acceptable
to authority having jurisdiction. In absence of such
requirements National Fuel gas Code, ANSI Z223.1/
NFPA 54.
• Size and install gas piping system to provide sucient
gas supply to meet maximum input at not less than
minimum supply pressure. See Tables 4a and 4b.
Table - 4a Gas Pipe Sizes - Natural Gas
Length
of Pipe -
Ft.
Pipe Capacity - BTU Per Hour Input
Includes Fittings
1/2" 3/4" 1" 1 -1/4"
20 92,000 190,000 350,000 625,000
40 63,000 130,000 245,000 445,000
60 50,000 105,000 195,000 365,000
Table - 4b Gas Pipe Sizes - Propane Gas
Length
of Pipe -
Ft.
Pipe Capacity - BTU Per Hour Input
Includes Fittings
5/8" 3/4" 1/2" 3/4"
20 131,000 216,000 189,000 393,000
40 90,000 145,000 129,000 267,000
60 72,000 121,000 103,000 217,000
* Outside diameter
Length of pipe or tubing should be measured from the gas meter
or propane second stage regulator.
Support piping with hooks straps, bands, brackets,
hangers, or building structure components to prevent or
dampen excessive vibrations and prevent strain on gas
connection. Gas valve will not support piping weight.
Use thread (joint) compound (pipe dope) suitable for natural
and liqueed petroleum gas.
Install eld sourced manual main shuto valve, ground
joint union, and sediment trap upstream of gas valve. See
Figure 10.
DANGER
Fire Hazard. Do not use matches, candles, open
ames, or other methods providing ignition source.
Failure to comply will result in death or serious
injury.
!
Leak Check Gas Piping
Pressure test boiler and gas connection before placing
boiler in operation. Avoid excessive pressure that
could damage pressure regulators, valves, or meters.
• Pressure test at 1/2 psig (3.5 kPa) or less. Isolate
boiler from gas supply system by closing manual
gas shuto valve.
• Locate leakage using gas detector, noncorrosive
detection uid, or other leak detection method
acceptable to authority having jurisdiction. Do
not use matches, candles, open ames, or other
methods providing ignition source.
• Correct leaks immediately and retest.
Figure 10 - Gas Piping At Boiler
3” Minimum
Sediment
Trap
Manifold
Floor Line
Automatic
Gas Valve
Ground
Joint
Union
Propane Installation
WARNING
Fire, explosion, asphyxiation hazard. Verify boiler
is equipped with propane gas orices and gas valve
is congured for propane. Failure to follow these
instructions may result in serious injury or death.
• Connections by licensed propane dealer only.
• Use two stage regulator provided by propane
supplier.
• Have propane supplier check piping.
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

17
ELECTRICAL WIRING
Figure 11 - Isolation Relay Wiring For
Steam Boilers With Float Type Low
Water Cut O And Use of Electronic
Thermostat
Figure 12 - Isolation Relay Wiring For
Steam Boilers With Probe Type Low
Water Cut O And Use of Electronic
Thermostat
WARNING
Electrical shock hazard. Turn OFF electrical power
supply at service panel before making electrical
connections. Failure to do so could result in death
or serious injury.
!
NOTICE
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
Electric Power Supply
Electrically bond boiler to ground in accordance with
requirements of authority having jurisdiction. Refer to
National Electrical Code, ANSI/NFPA 70.
Line Voltage Connections
A. Provide individual 120V, 15 amp circuit
(recommended) with fused disconnect or service
switch as required by authority having jurisdiction.
B. Locate a shut-o switch at the boiler.
C. Connect 115V electrical supply to primary leads on
24 volt transformer. Securely fasten with wire nuts.
D. Set heat anticipator at 0.6 amps for boilers
equipped with intermittent ignition. Connect 24
volt thermostat leads to two wires tagged “24 volt
thermostat” on boiler.
E. Boilers with 67D-1 oat type low water cut-o, two
wires are black. One wire is located on secondary
of 24 volt transformer, second wire is located on
pressure limit control.
F. Boilers with CG400 probe type low water cut-o,
one wire is green and is located on terminal P2
of CG400, second wire is black and located on
pressure limit control.
VENT DAMPER
Boiler is equipped with factory wired 4 pin molex harness,
that plugs into 4 pin molex receptacle inside vent damper
control.
Vent damper must be connected for boiler to operate.
Thermostat Installation
1. Install thermostat on inside wall per manufacturer's
instructions.
2. NEVER install thermostat on outside wall.
3. Do not install thermostat where it will be aected by
drafts, hot or cold pipes, sunlight, lighting xtures,
televisions, replace, or chimney.
4. Check thermostat operation by raising and lowering
thermostat setting as required to start and stop
burners.
5. Instructions for nal adjustment of thermostat see
manufacturer's instructions.
Electronic Thermostats
A. Some electronic thermostats may lose their
memory or shut down. With probe type low water
cuto, this may occur each time low water cuto
detects low water condition. If this is the case, an
isolation relay is required for thermostat circuit. A
24 volt single pole single throw (SPST) normally
open (N.O.) relay is required, such as Honeywell
R8222A or equivalent. Wire as shown in Figure 11
or Figure 12.
B. Some electronic thermostats are not acceptable
for use with steam systems, check manufacturer
suggested use.
P2P2
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

18
OPERATING INSTRUCTIONS
1. STOP! Read the safety information on this page.
2. Set the thermostat to lowest setting.
3. Turn o all electric power to the appliance.
4. This appliance is equipped with an ignition device which
automatically lights the pilot. Do not try to light the
pilot by hand.
Figure 13 - Gas Valve
5. Remove lower front panel.
6. Rotate the gas control knob clockwise to“OFF”.
7. Wait ve (5) minutes to clear out any gas. Then smell
for gas, including near the oor. If you smell gas,
STOP! Follow “B” in the safety information on this page
If you don’t smell gas, go to next step.
8. Rotate the gas control knob counterclockwise
to “ON.”
9. Replace lower front panel.
10. Turn on all electric power to the appliance.
11. Set thermostat to desired setting.
12. If the appliance will not operate, follow the instructions
“To Turn O Gas To Appliance” and call your service
technician or gas supplier.
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting.
2. Turn o all electric power to the appliance if service is
to be performed.
3. Push in gas control knob slightly and turn clockwise
to “OFF” Do not force.
For Your Safety Read Before Operating
WARNING
If you do not follow these instructions
exactly, a re or explosion may result
causing property damage, personal injury
or loss of life.
• This appliance is equipped with an ignition device
which automatically lights burner. Do NOT try to
light this burner by hand.
• Before operating smell all around appliance area
for gas. Be sure to smell next to oor because
some gas is heavier than air and will settle to the
oor.
• Use only your hand to turn the gas shuto
valve. Never use tools. If valve will not turn
by hand, do not try to repair it, call a qualied
service technician. Force or attempted repair may
result in re or explosion.
• Do not use this appliance if any part has
been under water. Immediately call a qualied
service technician to inspect appliance and to
replace any part of control system and any gas
control which has been under water.
!
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.
!!
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

19
OPERATING YOUR BOILER
Filling System With Water
Steam heating systems boiler is partially lled with water.
Fill boiler to correct level for proper system operation.
Correct water level is about halfway up glass water level
gauge as marked on boiler jacket.
1. Close boiler drain valve.
2. Open valves at top and bottom of glass water level
gauge.
3. Open ll valve. Allow water to run into boiler.
4. Allow boiler to ll until water runs out gauge drain
valve. Then close gauge drain valve.
5. Continue to ll boiler until water reaches indicated
water line about halfway up glass gauge.
Water Level
• Normal water level is 24" above the oor as shown on
left side of boiler.
• Determine water level when boiler is o and cold, when
all water in the system is inside the boiler and return
piping below water line, and everything above water
line is air, no steam.
• When boiler is making steam, water level drops two to
three inches below normal water line.
WARNING
Burn Hazard. Never run water into a hot empty
boiler. Failure to follow these instructions could
result in death or serious injury.
!Thermostat
A. Set thermostat to desired room temperature.
B. Set thermostat to lower setting if heat is not
required
C. System is self-checking. If failure of any component
system will not operate or will go into safety
lockout.
D. On call for heat, each component must function
properly to permit operation.
E. Turn thermostat to lowest setting for one minute
and back to normal setting to reset on safety
lockout.
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]

20
CHECKING AND ADJUSTING
Figure 14 - Igniter
Adjust Pilot Burner
Pilot ame should surround 3/8” to 1/2” of pilot sensor. See
Figure 14
To adjust Flame.
1. Remove screw cover over pilot adjusting screw. See
Figure 14.
2. Insert small screwdriver and adjust ame as needed.
Turn screw counterclockwise to increase ame, clock-
wise to decrease.
3. Replace screw cover over pilot adjusting screw.
Main Burners
• Main burners do not require primary air adjustment and
are not equipped with primary air shutters.
• Main burner ames form sharp blue inner cones in
softer blue outer mantel, with no yellow. Remain still
when observing main burner ames.
• Check main burner orices, burner throat and ame
ports for dust and lint obstruction if ame appearance
is not correct.
• Remove rollout shield if necessary to observe main
burner ames. See Figure15.
• Replace rollout shield after observation.
Gas Valve Safety Shutdown Test
1. Test ignition system safety shuto device after placing
boiler in operation.
2. Boilers equipped with intermittent ignition, with
main burners ring, disconnect ignition cable from
intermittent pilot control box. Gas valve will shut o
main burners.
3. TURN OFF ELECTRIC POWER to boiler before
reconnecting ignition cable, to prevent electric shock.
Figure 15 - Main Burner
P/N IM-BS2-01
[PN 240009728, Rev. K 05/01/2021]