U.S. Boiler Company V13A RO/FO, V14A RO/FO Installation, Operating And Service Instructions

INSTALLATION, OPERATING AND

SERVICE INSTRUCTIONS FOR

V1™ RO/FO SERIES

OIL - FIRED BOILER

For service or repairs to boiler, call your heating contractor or oil supplier. When seeking information on boiler, provide Boiler Model Number and Serial Number as shown on Rating Label located on top of the boiler.

Boiler Model Number

V1 _ A RO/FO

Heating Contractor Phone Number

Address

103625-01 - 1/13

Boiler Serial Number Installation Date

Price - $5.00

IMPORTANT INFORMATION - READ CAREFULLY

All boilers must be installed in accordance with National, State and Local Plumbing, Heating and Electrical Codes and the regulations of the serving utilities. These Codes and Regulations may differ from this instruction manual. Authorities having jurisdiction should be consulted before installations are made. In all cases, reference should be made to the following Standards:

USA BOILERS A. Current Edition of American National Standard ANSI/NFPA 31, “Installation of Oil Burning Equipment”, for recommended installation practices. B. Current Edition of American National Standard ANSI/NFPA 211, “Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances”, For Venting requirements. C. Current Edition of American Society of Mechanical Engineers ASME CSD-1, “Controls and Safety Devices for Automatically Fired Boilers”, for assembly and operations of controls and safety devices. D. All wiring on boilers installed in the USA shall be made in accordance with the National Electrical Code and/or Local Regulations.

The following terms are used throughout this manual to bring attention to the presence of hazards

of various risk levels, or to important information concerning product life.

DANGER

Indicates an imminently hazardous situation which, if not avoided, will result in death, serious injury or substantial property damage.

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death, serious injury or substantial property damage.

Indicates a potentially hazardous situation which, if not avoided, may result in moderate or minor injury or property damage.

Indicates special instructions on installation, operation, or maintenance which are important but not related to personal injury hazards.

CAUTION

NOTICE

This boiler has a limited warranty, a copy of which is included with the boiler. The warranty for this boiler is valid only if the boiler has been installed, maintained and operated in

accordance with these instructions.

Surface rust on cast iron sections may be attributed to the manufacturing process as well as condensation during storage. Surface rust is normal and does not affect the performance or longevity of a boiler.

DANGER

DO NOT store or use gasoline or other ammable vapors or liquids in the vicinity of this or any other appliance.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Failure to follow all instructions in the proper order can cause personal injury or death. Read and understand all instructions, including all those contained in component manufacturers manuals which are provided with the appliance before installing, starting-up, operating, maintaining or servicing this appliance. Keep this manual and literature in legible condition and posted near appliance for reference by owner and service technician.

This boiler requires regular maintenance and service to operate safely. Follow the instructions contained

in this manual.

Installation, maintenance, and service must be performed only by an experienced, skilled and knowledgeable installer or service agency.

All heating systems should be designed by competent contractors and only persons knowledgeable in the layout and installation of hydronic heating systems should attempt installation of any boiler.

Installation is NOT complete unless a pressure relief valve is installed into the 3/4" tapping located in top left corner of front section - See Figure 1 and "Water Boiler Piping" Section of this manual for details.

It is the responsibility of the installing contractor to see that all controls are correctly installed and are operating properly when the installation is complete including verifying that the limit sensor is fully installed.

Failure to properly install Limit Sensor may result in property damage, personal injury or loss of life due to elevated operating temperatures and/or pressures.

This boiler is suitable for installation on combustible ooring. DO NOT install boiler on carpeting.

DO NOT tamper with or alter the boiler or controls.

Inspect ueways at least once a year - preferably at the start of the heating season. The inside of the combustion chamber, the vent system and boiler ueways should be cleaned if soot or scale has

accumulated.

When cleaning this boiler, take precaution to avoid damage to target wall, chamber liner or burner mounting plate insulation. If damaged, or if there is evidence of previous damage, replace the damaged insulation piece(s) immediately.

Oil Burner and Controls must be checked at least once a year or as may be necessitated.

DO NOT operate unit with jumpered or absent controls or safety devices.

DO NOT operate unit if any control, switch, component, or device has been subject to water.

Boiler materials of construction, products of combustion and the 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

This boiler contains very hot water under high pressure. DO NOT unscrew any pipe ttings nor attempt to disconnect any components of this boiler without positively assuring the water is cool and has no

pressure. Always wear protective clothing and equipment when installing, starting up or servicing this

boiler to prevent scald injuries. DO NOT rely on the pressure and temperature gauges to determine the temperature and pressure of the boiler. This boiler contains components which become very hot when the boiler is operating. DO NOT touch any components unless they are cool.

This boiler must be properly vented. The boiler must be connected to an approved chimney or vent system in good condition. Serious property damage could result if the boiler is connected to a dirty or

inadequate chimney or vent system. The chimney must be inspected for any obstructions and cleaned prior to each heating season. A clean and unobstructed chimney ue is necessary to produce the minimum draft required to safely evacuate noxious fumes that could cause personal injury or loss of life. DO NOT

operate boiler with the absence of an approved vent system. Evidence of loose debris and or condensate

induced stains at the base of the chimney ue, connector or smokepipe joints may be signs of condensing ue gases. Flue gas condensate is corrosive, which requires special consideration and must be addressed

immediately. Refer to "Venting (Natural Draft - Chimney)" listed in Table of Contents below .

This boiler needs fresh air for safe operation and must be installed so there are provisions for adequate

combustion and ventilation air.

This boiler is supplied with controls which may cause the boiler to shut down and not re-start without service. If damage due to frozen pipes is a possibility, the heating system should not be left unattended in cold weather; or appropriate safeguards and alarms should be installed on the heating system to prevent damage if the boiler is inoperative.

This boiler is designed to burn No. 2 fuel oil only. DO NOT use gasoline, crankcase drainings, or any oil containing gasoline. Never burn garbage or paper in this boiler. DO NOT convert to any solid fuel (i.e. wood, coal). DO NOT convert to any gaseous fuel (i.e. natural gas, LP). All ammable debris, rags, paper, wood scraps, etc., should be kept clear of the boiler at all times. Keep the boiler area clean and

free of re hazards.

I. General Information.......................................... 5 VIII. Maintenance & Service Instructions ................ 31

II. Pre-Installation ................................................ 7 IX. Cleaning of Boiler.............................................. 33

III. Installation Instructions..................................... 8 X. Troubleshooting ............................................... 35

IV. Venting (Natural Vent - Chimney) .................... 13 XI. Repair Parts...................................................... 38

V. Electrical............................................................ 17

VI. System Start-Up............................................... 20

VII. Operating............................................................ 27

TABLE OF CONTENTS

Appendix A

Low Water Cut Off on Hot Water Boilers..........

Figure: 1: VI-RO/FO Water Boiler with Tankless Heater, Beckett AFG Burner

SECTION I: GENERAL INFORMATION

(LB.)

Actual Shipping Weight

Ft.

Heat Transfer

Surface Area - Sq.

Gallons

Boiler

Water

AFUE %

Ft.

Height

In. x In.

Rectangle

Requirements

Minimum Chimney

Round

In. Dia.

Heater

Tankless

AHRI

NET Ratings

GPM

Capacity

V1-2 Heater

Water MBH

SECTION I: GENERAL INFORMATION (continued)

Water Content -

“A”

Dimensions

V13A RO/FO 15-7/8" 13.5 13.95 519

V14A RO/FO 19-7/8" 15.9 19.64 603

TABLE 1A: DIMENSIONAL DATA / GENERAL INFORMATION (SEE FIGURE 1)

Boiler Model No.

NOTE: Maximum Working Pressure: Water: 30 PSI (Water Only)

DOE Heating

Capacity MBH

Burner Capacity

GPH MBH

No.

V13A RO/FO 0.75 105 89 77 3-1/4 6 8 x 8 15 84.0

TABLE 1B: RATING DATA

Boiler Model

V14A RO/FO 1.05 147 125 109 4 6 8 x 8 15 84.0

SECTION II: PRE-INSTALLATION

A. INSPECT SHIPMENT carefully for any signs of

damage.

1. ALL EQUIPMENT is carefully manufactured, inspected and packed. Our responsibility ceases upon delivery of created Boiler to the carrier in good condition.

2. ANY CLAIMS for damage or shortage in shipment

must be led immediately against the carrier by

the consignee. No claims for variances from, or shortage in orders, will be allowed by the manufacturer unless presented within sixty (60) days after receipt of goods.

B. LOCATE BOILER in front of nal position before

removing crate. See Figure 1.

1. LOCATE so that smoke pipe connection to chimney will be short and direct. BOILER IS SUITABLE FOR INSTALLATION ON COMBUSTIBLE FLOOR.

2. FOR BASEMENT INSTALLATION, provide a

concrete base if oor is not perfectly level, or if water may be encountered on oor around Boiler.

3. PROVIDE CLEARANCE of at least 24" on right

side of Boiler for cleaning ueways and for removal

of Tankless Heater. Provide clearance of at least 14" in front (measured from front jacket panel) for servicing burner.

C. PROVIDE COMBUSTION AND VENTILATION

AIR. Local code provisions may apply and should be

referenced.

WARNING

Adequate combustion and ventilation air must

be provided to assure proper combustion and to maintain safe ambient air temperatures.

DO NOT install boiler where gasoline or other

ammable vapors or liquids, or sources of

hydrocarbons (i.e. bleaches, fabric softeners, etc.) are used or stored.

1. Determine volume of space (boiler room). Rooms communicating directly with the space in which the appliances are installed, through openings not furnished with doors, are considered a part of the space.

Volume(ft

2. Determine total input of all appliances in the space.

Add inputs of all appliances in the space and round

the result to the nearest 1000 BTU per hour.

3. Determine type of space. Divide Volume by total input of all appliances in space. If the result is greater than or equal to 50 ft3/1000 BTU per hour, then it is considered

) = Length(ft) x Width(ft) x Height(ft)

an unconned space. If the result is less than 50 ft3/1000 BTU per hour then the space is considered a conned space.

4. For boiler located in an unconned space of a conventionally constructed building, the fresh air

inltration through cracks around windows and doors

normally provides adequate air for combustion and ventilation.

5. For boiler located in a conned space or an unconned

space in a building of unusually tight construction, provide outdoor air with the use of two permanent openings which communicate directly or by duct with the outdoors or spaces (crawl or attic) freely communicating with the outdoors. Locate one opening within 12 inches of top of space. Locate remaining opening within 12 inches of bottom of space. Minimum dimension of air opening is 3 inches. Size each opening per following:

a. Direct communication with outdoors. Minimum

free area of 1 square inch per 4,000 BTU per hour input of all equipment in space.

b. Vertical ducts. Minimum free area of 1 square inch

per 4,000 BTU per hour input of all equipment in space. Duct cross-sectional area shall be same as opening free area.

c. Horizontal ducts. Minimum free area of 1 square

inch per 2,000 BTU per hour input of all equipment in space. Duct cross-sectional area shall be same as opening free area.

Alternate method for boiler located within conned

space. Use indoor air if two permanent openings

communicate directly with additional space(s) of

sufcient volume such that combined volume of all spaces meet criteria for unconned space. Size

each opening for minimum free area of 1 square inch per 1,000 BTU per hour input of all equipment in spaces, but not less than 100 square inches.

6. Louvers and Grilles of Ventilation Ducts

a. All outside openings should be screened and

louvered. Screens used should not be smaller than 1/4 inch mesh. Louvers will prevent the entrance of rain and snow.

b. Free area requirements need to consider the

blocking effect of louvers, grilles, or screens protecting the openings. If the free area of the louver or grille is not known, assume wood louvers have 20-25 percent free area and metal louvers and grilles have 60-75 percent free area.

c. Louvers and grilles must be xed in the open

position, or interlocked with the equipment to open automatically during equipment operation.

III: INSTALLATION INSTRUCTIONS

A. REMOVE CRATE -

1. Remove all fasteners at crate skid.

2. Lift outside container and remove with all other inside protective spacers and bracing. Remove Parts Carton containing Safety Relief Valve, Boiler Drain Valve, Circulator, Fittings and Miscellaneous

Hardware.

B. REMOVAL OF BOILER FROM SKID

1. Boiler is secured to base with 4 bolts, 2 on left side and 2 on right side, see Figure 2. Remove all bolts.

Figure 2: Removal of Boiler From Skid

2. Tilt boiler to right and to rear. Using right rear leg as pivot, rotate boiler 90° in a clockwise direction,

and lower left side of boiler to oor. Tilt boiler

and remove crate skid. Care should be exercised to prevent damage to Jacket or Burner.

C. MOVE BOILER TO PERMANENT POSITION

by sliding or walking.

D. INSPECT COMBUSTION TARGET WALL.

1. OPEN FLAME OBSERVATION DOOR on front of boiler.

2. Use ashlight to inspect Target Wall secured to rear

section with silastic. If damaged, replace.

WARNING

Any combustion chamber insulation which was damaged must be replaced immediately.

E. INSTALL CANOPY

The canopy is shipped in a separate carton.

1. Open canopy carton and remove canopy.

2. Remove two (2) sheet metal screws securing front of jacket top panel and(2) sheet metal screws near the top of both side panels. Pull side panels outward to allow jacket top panel to swing upward as shown in Figure 3, Step 1.

Figure 3:

Installation of Canopy (See text for proper procedure)

III: INSTALLATION INSTRUCTIONS (continued)

3. Check that cerafelt gasket is in place on top of the cast iron block.

4. Using screwdriver and pliers, remove the 6½" knock out from the rear panel, AS SHOWN IN Figure 3, Step 2.

5. Insert the canopy onto the top of the block and fasten with the four (4) bolts and nuts provided as shown in Figure 3, Step 3. Be sure that the canopy tightens evenly onto the cerafelt gasket.

WARNING

DO NOT assemble canopy without cerafelt gaskets between canopy and heat exchanger.

NOTE: The Rear Outlet Canopy is provided with

a removable cover for inspection and cleaning of

the chimney breeching, as necessary in conned

installations.

6. Before replacing jacket top panel, determine if future access to the chimney breeching through the canopy opening is anticipated. If so, cut along perforated bend line to separate jacket top panel from the rear panel as shown in Figure 3, Step 4. Close or replace top panel and secure with sheet metal screws removed in Step 2 above.

3. Securing Limit Sensor, see Figure 5.

Step a. Bend the Limit Sensor lead wires over front

edge of Immersion Well making sure that sensor is still fully seated.

Step b. Position Limit Sensor clip as shown in

Figure 5. Engage the hook end of the clip over the lead wires upstream of the Immersion Well.

Step c. While sliding clip toward Immersion Well,

engage retaining ring end of sensor clip into locking groove on Immersion Well until it snaps into place around collar.

F. INSTALL LIMIT RATED TEMPERATURE

SENSOR

1, Locate Limit Sensor and Hardware Envelope

packed in Miscellaneous Parts Carton.

2. Insert the Limit Sensor into Immersion Well until it rests against the bottom of the well as shown in Figure 4.

WARNING

Failure to properly install Limit Sensor may result in property damage, personal injury or loss of life due to elevated operating temperatures and/or pressures.

Figure 4: Limit Sensor Insertion

Figure 5: Securing Limit Sensor

4. Slide rubber grommet to within 12" of connector end of Limit Sensor wire if it is not already there.

5. Use (3) 1/4" cable clamps and (3) #8 x 1/2 sheet metal screws to secure Limit Sensor lead wires using pre-punched holes in side panel and jacket front panel as shown in Figure 1.

6. Remove top right knockout on boiler control as shown in Figure 1. Insert connector end of Limit Sensor through knockout. Remove all slack from lead wires and slide rubber grommet along wires until fully seated into control knockout.

7. Carefully connect sensor into the L7224 Boiler Control circuit board by pressing connector on sensor unit into mating connector on circuit board (refer to Figure 22).

G. CONNECT SUPPLY AND RETURN PIPING TO

HEATING SYSTEM.

CLEARANCES - Hot water pipes shall have clearances

of at least ½" from all combustible construction.

III: INSTALLATION INSTRUCTIONS (continued)

1. For Forced Circulation HOT WATER HEATING, refer to Figure 6 for recommended boiler piping. Consult I=B=R ,"Residential Hydronic Heating Installation and Design Guide".

2. Plug lower rear 1½" tapping if it is not to be used.

3. Install relief valve and ttings in top of front section,

see Figure 1.

4. Install drain valve and return piping in lower front 1-1/2" return tapping. If using return side circulator, mount circulator on 18" return piping nipple provided, otherwise mount circulator in supply side piping, see Figure 1 and Figure 6.

CAUTION: OXYGEN CORROSION

Oxygen contamination of the boiler water will cause

corrosion of the iron and steel boiler components, which can lead to failure. As such, any system must be designed to prevent oxygen absorption in

the rst place or prevent it from reaching the boiler.

Problems caused by oxygen contamination of boiler water are not covered by U.S. Boiler Company's standard warranty.

There are many possible causes of oxygen

contamination such as:

a. Addition of excessive make-up water as a result

of system leaks.

b. Absorption through open tanks and ttings.

c. Oxygen permeable materials in the distribution

system.

In order to insure long product life, oxygen sources

should be eliminated. This can be accomplished by taking the following measures:

a. Repairing system leaks to eliminate the need for

addition of make-up water.

b. Eliminating open tanks from the system.

c. Eliminating and/or repairing ttings which allow

oxygen absorption.

d. Use of non-permeable materials in the

distribution system.

e. Isolating the boiler from the system water by

installing a heat exchanger.

5. If the boiler is to be operated in a system which has a large volume or excessive radiation where low boiler water temperatures may be encountered (i.e. converted gravity circulation system, etc.) the use of a boiler water bypass is recommended to maintain optimum operation.

Figure 6: Recommended Water Piping for Zone Valve Zoned Heating Systems

III: INSTALLATION INSTRUCTIONS (continued)

Figure 8: Recommended Piping for Combination

Figure 7: Recommended Bypass Piping

for V1 RO/FO

Remove the circulator and install a pipe tee between

the circulator and boiler return along with a second tee in the supply piping as shown in Figure 7. The bypass should be the same size as the supply and return lines with valves located in the bypass and supply outlet as

illustrated in Figure 7 in order to regulate water ow

to maintain higher boiler water temperatures.

Set the by-pass and boiler supply valves to a half throttle

position to start. Operate boiler until the system water temperature is at a normal operating range.

Adjust the valves to provide 180° to 200°F supply

water temperature. Opening the boiler supply valve will raise the system temperature, while opening the by-pass valve will lower the system supply temperature.

6. If this boiler is used in connection with refrigeration systems, the boiler must be installed so that the chilled medium is piped in parallel with the heating boiler using appropriate valves to prevent the chilled medium from entering the boiler, see Figure 8. Also consult I=B=R ,"Residential Hydronic Heating Installation and Design Guide".

7. If this boiler is connected to heating coils located in air handling units where they may be exposed to refrigerated air the boiler piping must be equipped with

ow control valves to prevent gravity circulation of

boiler water during the operation of the cooling system.

Heating & Cooling (Refrigeration) System

9. If it is required to perform a long term pressure test of

To perform a long term pressure test including the

Assure that there is not air left inside boiler when checking for leaks. DO NOT test for leaks with pressurized air.

A loss of pressure during such a test, with no visible

H. CONNECT TANKLESS HEATER PIPING AS

SHOWN IN Figure 9. See Table 2 for Tankless Heater

Ratings.

THE FOLLOWING GUIDELINES SHOULD BE FOLLOWED WHEN PIPING THE TANKLESS HEATER:

1. FLOW REGULATION - If low through the heater is

IMPORTANT

8. A hot water boiler installed above radiation level must be provided with a low water cutoff device as part of the installation.

If a low water cut-off is required, it must be mounted

in the system piping above the boiler. The minimum

safe water level of a hot water boiler is just above the highest water containing cavity of the boiler; that is, a hot water boiler must be full of water to operate safely. Refer to Appendix "A" at the rear of this manual.

the hydronic system, the boiler should rst be isolated

to avoid a pressure loss due to the escape of air trapped in the boiler.

boiler, ALL trapped air must rst be removed from

the boiler.

WARNING

water leakage, is an indication that the boiler contained trapped air.

greater than its rating, the supply of adequate hot water may not be able to keep up with the demand. For this

reason a ow regulator matching the heater rating

should be installed in the cold water line to the heater.

The ow regulator should preferably be located below

the inlet to the heater and a minimum of 3' away from the inlet so that the regulator is not subjected to excess temperatures that may occur during "off" periods when it is possible for heat to be conducted back through the

III: INSTALLATION INSTRUCTIONS (continued)

Table 2: Tankless Heater Data

Boiler Model

V13A RO/FO V1-2 3¼ 5.6

V14A RO/FO V1-2 4 8.0

Heater

No.

Heater Rating

(GPM)

Pressure Drop

Thru Heater (PSI)

NOTE: Tankless heater ratings in the V1 RO/FO oil boilers are based on intermittent draw, temperature rise of 100°F (40140°F) and boiler water temperature of 200°F.

Figure 9: Schematic Tankless Heater Piping

supply line. The ow regulator also limits the ow of

supply water regardless of inlet pressure variations in the range of 20 to 125 psi.

WARNING

Install automatic mixing valve at tankless heater outlet to avoid risk of burns or scalding due to

excessively hot water at xtures. Adjust and

maintain the mixing valve in accordance with the manufacturer's instructions.

2. TEMPERING OF HOT WATER - Installation of an automatic mixing valve will lengthen the delivery of the available hot water by mixing some cold water with the hot. This prevents excessive and possibly scalding

hot water at the xtures. In addition, savings of hot

water will be achieved since the user will not waste as much hot water while seeking water temperature to his liking. Higher temperature hot water required by dishwashers and automatic washers is possible by piping the hot water from the heater prior to entering the mixing valve. The mixing valve should be "trapped" by installing it below the cold water inlet to heater to prevent lime formation in the valve.

city pressure to run into hose bib A, through the heater, and out hose bib B until the discharge is clear. The tees in which the hose bibs are located should be the same size as heater connections to minimize pressure drop.

4. HARD WATER - This applicable to some city water

and particularly to well water. This should not be a deterrent but precautions are necessary. A water analysis is necessary and an appropriate water softener installed.

This is not only benecial to the heater but to piping and xtures plus the many other benets derived from

soft water.

I. CONNECT OIL LINES - do not use compression ttings.

Use only are tting. Note that the pump supplied on the

V1 RO/FO is TWO-STAGE and is set up for TWO-PIPE operation, see Figure 10. Refer to Table 3 for recommended maximum lengths to be used.

Table 3: Two-Pipe Systems - Two Stage Pump

Lift "L" (feet)

0 68 100

2 63 100

4 58 100

6 53 100

8 48 100

10 42 100

12 37 100

14 32 100

16 27 100

18 22 88

* Line lengths include both vertical and horizontal lengths.

Length of Tubing* (feet)

Two-Stage Units

3/8" OD 1/2" OD

. FLUSHING OF HEATER - All water contains some

sediment which settles on the inside of the coil. Consequently, the heater should be periodically backwashed. This is accomplished by installing hose bibs as illustrated in Figure 9 and allowing water at

Figure 10: Two-Pipe Installation

IV: VENTING (NATURAL VENT - CHIMNEY)

J. INSTALL BREECHING. For normal installation in

a large conned space refer to local codes for proper

selection of the breeching materials.

For installation in a conned space such as an under-

counter installation, special consideration must be given to the selection of breeching material. The temperature

within the conned space will be higher than in the normal

installation. One major source of those higher temperature

is the exposed breeching within the conned space. Thus,

it is required that any exposed breeching be constructed of type "L" are equivalent vent material.

Furthermore, the likelihood of accidental ignition of

combustibles within 12" of the breeching is increased

when the boiler is installed in a conned space. This is

due to the lack of free air movement over the surfaces to cool them. For this reason THE ENTIRE LENGTH OF BREECHING FROM THE OUTLET OF THE BOILER TO THE CHIMNEY MUST BE INSTALLED ACCORDING TO NFPA 211, OR LOCAL CODES. Refer to Figures 11, 12 and 13.

Figure 11: Installation of FO in a Conned Space with Adjacent Chimney

NOTE:

1. Type L Vent Material generally means stainless steel inner liner and stainless steel outer covering and separated with 1" thick special high temperature insulation - factory assembled and rated.

2. In a conned space, provide ventilation air to the burner and size such ventilation air openings to provide not less than 28

square inches free area per gallon of fuel input to the burner.

3. Keep right side of boiler accessible for ue cleanout and tankless coil maintenance.

4. Boiler is heavily insulated and is suitable for 1" clearance from jacket surface to combustibles.

5. Boiler is of wet base design and suitable for installation on combustible oors.

6. The original installation may have been under poor or outdated building codes. Replacement boilers are subject to codes

in effect at the time of replacement. Be sure to consult with local code ofcials before starting replacement.

IV: VENTING (NATURAL VENT - CHIMNEY) (continued)

Figure 12: Installation of RO in a Conned Space with Adjacent Chimney