Utica Gas fired Boiler User Manual

MGB  
GAS FIRED BOILERS  
FOR FORCED HOT WATER  
Utica Boilers, P.O. Box 4729 Utica, NY 13504  
Safety Symbols  
The following defined symbols are used throughout this manual to notify the  
reader of potential hazards of varying risk levels.  
DANGER  
DANGER - Indicates an imminently hazardous situation which, if not avoided, WILL  
result in death or serious injury.  
WARNING  
WARNING - Indicates a potentially hazardous situation which, if not avoided, COULD  
result in death or serious injury  
CAUTION  
CAUTION - Indicates a potential hazardous situation which, if not avoided, MAY result  
in minor or moderate injury. It may also be used to alert against unsafe practices.  
IMPORTANT! READ ALL INSTRUCTIONS BEFORE INSTALLING.  
WARNING:  
1. Keep boiler area clear and free from combustible materials, gasoline and other  
flammable vapors and liquids.  
2. DO NOT obstruct air openings to the boiler room.  
3. Modification, substitution or elimination of factory equipped, supplied or specified  
components may result in property damage, personal injury or the loss of life.  
4. To the owner: Installation and service of this boiler must be performed by a qualified  
installer.  
5. To the installer: Leave all instructions with the boiler for future reference.  
6. When this product is installed in the Commonwealth of Massachusetts the installation  
must be performed by a Licensed Plumber or Licensed Gas Fitter.  
WARNING: ALL INSTALLATIONS OF BOILERS AND  
VENTING SHOULD BE DONE ONLY BY A QUALIFIED EXPERT AND  
IN ACCORDANCE WITH THE APPROPRIATE UTICA BOILERS  
MANUAL. INSTALLING OR VENTING A BOILER OR ANY OTHER  
GAS APPLIANCE WITH IMPROPER METHODS OR MATERIALS MAY  
RESULT IN SERIOUS INJURY OR DEATH DUE TO FIRE OR TO  
ASPHYXIATION FROM POISONOUS GASES SUCH AS CARBON  
MONOXIDE WHICH IS ODORLESS AND INVISIBLE.  
PAGE2  
INSTALLATION PROCEDURE  
WARNING: Improperinstallation,adjustment,alteration,serviceormaintenance  
can cause injury or property damage.  
1.Theinstallationmustconformtotherequirementsoftheauthorityhavingjurisdictionor,  
in the absence of such requirements, to the latest revision of the National Fuel Gas Code,  
ANSI Z223. (Available from the American Gas Association, 8501 E. Pleasant Valley Road,  
Cleveland, Ohio 44134). Reference should also be made to local gas utility regulations and  
other codes in effect in the area in which the installation is to be made. When installed in  
Canada: The latest revision of the CAN1-B149.1 and/or B149.2 Installation Codes for Gas-  
Burning Equipment and/or local codes.  
2. Where required by the authority having jurisdiction, the installation must conform to  
AmericanSocietyofMechanicalEngineersSafetyCodeforControlsandSafetyDevicesFor  
Automatically Fired Boilers, ANSI/ASME No.CSD-1.  
3. This boiler series is classified as a Category 1 and the vent installation shall be in  
accordance with Part 7 of the National Fuel Gas Code noted above when installed in the  
United States. In Canada refer to the CAN1-B149.1 and or B149.2 Installation Codes for  
Gas-Burning Equipment. Also refer to applicable provisions of the local building codes.  
4. This boiler has met safe lighting and other performance criteria with the gas manifold  
and control assembly on the boiler per the latest revision of ANSI Z21.13/CGA 4.9.  
5.Theboilershallbeinstalledsuchthatthegasignitionsystemcomponentsareprotected  
fromwater(dripping, spraying, rain, etc.)duringapplianceoperationandservice, (circulator  
replacement, condensate trap, control replacement, etc.).  
6. LOCATE BOILER on level, solid base as near the chimney as possible and centrally  
located with respect to the heat distribution system as practical.  
7. Allow 24 inches at the front and right side for servicing and cleaning.  
8. When installed in a utility room, the door should be wide enough to allow the largest  
boiler part to enter, or to permit replacement of another appliance such as a water heater.  
9. FOR INSTALLATION ON NON-COMBUSTIBLE FLOORS ONLY . For installation  
on combustible flooring special base part no. 325-2-8.00 must be used. The boiler can not  
be installed on carpeting. Minimum clearances to combustible construction are:  
TOP ........................................18 IN.  
FRONT ...................................ALCOVE  
FLUECONNECTOR ...............6 IN.  
REAR......................................4 IN.  
CONTROL SIDE.....................9 IN.  
OTHERSIDE..........................3 IN.  
NOTE: Greater clearances for access should supersede fire protection clearances.  
PAGE3  
VENTILATION & COMBUSTION AIR  
WARNING: AIR OPENINGS TO COMBUSTION AREA MUST NOT BE  
OBSTRUCTED. BY FOLLOWING THE INSTRUCTIONS BELOW, ADEQUATE  
COMBUSTIONAIRCANBEMAINTAINED  
COMBUSTION AIR REQUIREMENTS  
(MINIMUMSQUAREINCHESOPENING)  
*UNCONFINEDAREA  
**CONFINED AREA  
OUTSIDE  
COMBUSTION COMBUSTION  
AIR 1 SQ. IN AIR 1 SQ. IN.  
/5000BTU/HR /1000BTU/HR  
INSIDE  
OUTSIDE COMBUSTION AIR  
MODEL  
NUMBER  
MGB  
VERTICAL  
HORIZONTAL  
DUCTS  
DUCTS  
1 SQ. IN.  
1 SQ. IN.  
(SEE FIG. 4)  
(SEE FIG. 3)  
/4000BTU/HR  
/2000BTU/HR  
MGB 38  
MGB 50  
MGB 75  
8
100  
100  
100  
100  
125  
150  
175  
200  
10  
13  
19  
25  
32  
38  
44  
50  
57  
69  
75  
19  
25  
38  
50  
63  
75  
88  
100  
113  
138  
150  
10  
15  
20  
25  
30  
35  
40  
45  
55  
60  
MGB 100  
MGB 125  
MGB 150  
MGB 175  
MGB 200  
MGB 225  
MGB 275  
MGB 300  
225  
275  
300  
* Unconfined 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).  
** Confined 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).  
1. Ventilation of the boiler room must be adequate to provide sufficient air to properly  
support combustion per the latest revision of the National Fuel Gas Code, ANSI Z223.1  
section 5.3.  
2.Whenaboilerislocatedinanunconfinedspaceinabuildingorconventionalconstruction  
frame, masonry or metal building, infiltration normally is adequate to provide air for  
combustionandventilation.However,iftheequipmentislocatedinabuildingofunusuallytight  
construction (See the national Fuel Gas Code, Ansi Z223.1 section 1.7), the boiler area  
shouldbeconsideredasaconfinedspace.Inthiscaseairforcombustionandventilationshall  
be provided according to part 5 on page 5. 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 unconfined space, in a building of unusually tight  
PAGE4  
construction, air for combustion and ventilation must be obtained from outdoors or from  
spacesfreelycommunicatingwiththeoutdoors. Apermanentopeningoropeningshavinga  
total free area of not less than 1 square inch per 5,000 BTU per hour of total input rating of  
allappliancesshallbeprovided. Ductsmaybeusedtoconveymakeupairfromtheoutdoors  
and shall have the same cross-sectional area of the openings to which they are connected.  
4.Whenairforcombustionandventilationisfrominsidebuildings,theconfinedspaceshall  
be provided with two permanent openings, one starting 12 inches from the top and one 12  
inchesfromthebottomoftheenclosedspace.Eachopeningshallhaveaminimumfreearea  
of1squareinchperonethousand(1000)BTUperhourofthetotalinputratingofallappliances  
in the enclosed space, but must not be less than one hundred (100) square inches. These  
openingsmustfreelycommunicatedirectlywithotherspacesofsufficientvolumesothatthe  
combined volume of all spaces meets the criteria for an unconfined space.  
5.Whentheboilerisinstalledinaconfinedspaceandallairisprovidedfromtheoutdoors  
the confined 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. Wheninstallingtwoopenings,onemustcommencewithin12inchesfromthetopand  
theotherwithin12inchesfromthebottomoftheenclosure.Theopeningsshallcommunicate  
directly, orbyducts, withtheoutdoorsorspaces(crawlorattic)thatfreelycommunicatewith  
the outdoors. One of the following methods must be used to provide adequate air for  
ventilationandcombustion.  
1. 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 2 below.  
FIGURE1  
FIGURE2  
2. When communicating with the outdoors by means of vertical 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. See figure 3 on page 6.  
3. If horizontal ducts are used, each opening and duct shall have a minimum free  
area1squareinchper2,000BTUperhouroftotalinputratingofallappliancesintheenclosed  
space. See figure 4 on page 6.  
B. Onepermanentopening,commencingwithin12inchesofthetopoftheenclosure,  
PAGE5  
FIGURE3  
FIGURE4  
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  
communicatewiththeoutdoorsorshallcommunicatethroughaverticalorhorizontalductto  
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  
inputratingofallequipmentlocatedintheenclosure. Thefreeareamustbenolessthanthe  
sum of the areas of all vent connectors in the confined space.  
6.Incalculatingfreeareausinglouvers,grillesorscreensfortheabove,considerationshall  
be given to their blocking effect. Screens used shall not be smaller than 1/4 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 specified. If the design and free area is not known,  
itmaybeassumedthatwoodlouverswillhave20-25%freeareaandmetallouversandgrilles  
will have 60-75% free area. Louvers and grilles should be fixed in the open position or  
interlocked with the boiler so they are opened automatically during the boiler operation.  
CONNECTING SUPPLY AND RETURN PIPING  
IMPORTANT: Circulators in the following illustrations are mounted on the system supply  
side, but mounting on the system return side is also acceptable practice.  
1. Connect supply and return piping as suggested in figure 5 on page 7, when the boiler  
is used in connection with refrigerated systems.  
A. The chilled medium MUST BE PIPED IN PARALLEL with the boiler.  
B. Use appropriate valves to prevent the chilled medium from entering the  
heating boiler.  
a. During heating cycle open valves A and B, close valves C and D.  
b. During cooling cycle, open valves C and D, close valves A and B.  
C. Maintain a minimum clearance of one inch to hot water pipes.  
2.Whentheboilerisconnectedtoheatingcoilslocatedinairhandlingunitswheretheymay  
be exposed to refrigerated air circulation, the boiler piping system MUST BEsupplied with  
flowcontrolvalvesorotherautomaticmeanstopreventgravitycirculationoftheboilerwater  
duringthecoolingcycle.  
PAGE6  
BYPASSPIPING  
FIGURE5  
FIGURE6  
3. Hotwaterboilersinstalledaboveradiationlevelmustbeprovidedwithalowwatercut-  
off device.  
4. Whenaboilerisconnectedtoaheatingsystemthatutilizesmultiplezonedcirculators,  
eachcirculatormustbesuppliedwithaflowcontrolvalvetopreventgravitycirculation.  
5. Hot water boilers and system must be filled with water and maintained to a minimum  
pressure of 12 pounds per square inch.  
6. Bypass piping is an option which gives the ability to adjust the supply boiler water  
temperaturetofitthesystemortheconditionoftheinstallation.Thismethodofpiping,however,  
is not typically required for baseboard heating systems. Typical installations where bypass  
piping is used are as follows:  
A. This method is used to protect  
boilersfromcondensationformingduetolow  
MIXINGVALVEPIPING  
temperaturereturnwater.Generallynoticedin  
largeconvertedgravitysystemsorotherlarge  
water volume systems. See figure 6 above.  
B. Thesemethodsareusedtoprotect  
systemsusingradiantpanelsandthematerial  
they are encased in from high temperature  
supply water from the boiler and protect the  
boiler from condensation. See figure 7 at  
right and 8 on page 8.  
NOTE 1: When using bypass piping, adjust  
valves A and B until desired system  
temperature is obtained.  
NOTE 2: Bypass loop must be same size  
FIGURE7  
piping as the supply and return piping.  
PAGE7  
PRIMARY SECONDARY PIPING WITH BY PASS  
FIGURE8  
7. Installation using circulators is shown in figure 9 below.  
FIGURE9  
8. Installation using zone valves is shown in figure 10 on page 9.  
9. For further piping information refer to the I=B=R Installation and Piping Guide.  
PAGE8  
FIGURE10  
WARNING: ALL INSTALLATIONS OF BOILERS AND  
VENTING SHOULD BE DONE ONLY BY A QUALIFIED EXPERT AND  
IN ACCORDANCE WITH THE APPROPRIATE UTICA BOILERS  
MANUAL. INSTALLING OR VENTING A BOILER OR ANY OTHER  
GAS APPLIANCE WITH IMPROPER METHODS OR MATERIALS MAY  
RESULT IN SERIOUS INJURY OR DEATH DUE TO FIRE OR TO  
ASPHYXIATION FROM POISONOUS GASES SUCH AS CARBON  
MONOXIDE WHICH IS ODORLESS AND INVISIBLE.  
VENT INSTALLATION  
WARNING: This boiler shall not be connected to any portion of a mechanical  
draft system operating under positive pressure.  
1. The vent pipe must slope upward from the boiler not less then 1/4 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 classified as a Category 1 and the vent installation shall be in  
accordance with chapter 7 and 10 of 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  
lessthanthatofgalvanizedsheetsteeloraluminumnotlessthan0.016inchthick(No.28Ga).  
5. Connect flue pipe from draft hood to chimney. Bolt or screw joints together to avoid  
sags.Fluepipeshouldnotextendbeyondinsidewallofchimney.Donotinstallmanualdamper  
in flue pipe or reduce size of flue outlet except as provided by the latest revision of  
ANSIZ223.1. Protect combustible ceiling and walls near flue pip with fireproof insulation.  
Where two or more appliances vent into a common flue, the area of the common flue must  
be at least equal to the area of the largest flue plus 50 percent of the area of each additional  
flue.  
PAGE9  
VENT SYSTEM MODIFICATION  
Whenanexistingboilerisremovedfromacommonventingsystem,thecommonventing  
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  
Atthetimeofremovalofanexistingboiler,thefollowingstepsshallbefollowedwitheach  
applianceremainingconnectedtothecommonventingsystemplacedinoperation,whilethe  
other appliances remaining connected to the common venting system are not in operation.  
A. Seal an unused opening in the common venting system.  
B. Visuallyinspecttheventingsystemforpropersizeandhorizontalpitchanddetermine  
there is no blockage or restriction, leakage, corrosion and other deficiencies which could  
cause an unsafe condition.  
C. Insofar as is practical, close all building doors and windows and all doors between the  
space in which the appliances remaining connected to the common venting system are  
locatedandotherspacesofthebuilding. Turnonclothesdryersandanyotherappliancenot  
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 fireplace dampers.  
D.Placeinoperationtheappliancebeinginspected.Followthelightinginstructions.Adjust  
thermostat so appliance will operate continuously.  
E. Test for spillage at the draft hood relief opening after 5 minutes of main burner  
operation. Use the flame of a match or candle, or smoke from a cigarette, cigar or pipe.  
F. After it has been determined that each appliance remaining connected to a common  
venting system properly vents when tested as outlined above, return doors, windows,  
exhaust fans, fireplace dampers and any other gas burning appliances to their previous  
condition of use.  
G. 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.  
Whenresizinganyportionofthecommonventingsystem,thecommonventingsystemshould  
be resized to approach the minimum size as determined using the appropriate tables in  
appendix G in the latest revision of the National Fuel Gas Code, ANSI Z223.  
PAGE10  
VENT DAMPER INSTALLATION AND INSTRUCTIONS  
INSTALLATION  
NOTE: Refer to Figure 11for steps 1 - 7.  
1. PlaceVentDamperonorasclosetoventoutletofboileraspossible.Seefigure12below.  
2. Remove Vent Damper Motor cover.  
3. Remove locknut from connector at the end of the Damper wire harness.  
4. Feed Damper and Damper wire harness connectors through bracket hole on Damper  
Motor frame.  
5. Replace and tighten locknut onto Damper wire harness connector,  
6. Plug Damper connector into socket on Damper Motor frame.  
7. Replace Damper Motor cover.  
8. Wire Damper in accordance with figure 11below.  
FIGURE11  
FIGURE12  
INSTRUCTIONS  
1. Ensure that only the boiler is serviced by the Vent Damper. See Figure 12, above.  
2. Clearance of not less than 6 inches between Vent Damper and combustible material  
must be maintained. Additional clearance should be allowed for service of Vent Damper.  
3.VentDampermustbeintheopenpositionwhenappliancemainburnersareoperating.  
4. The Vent Damper position indicator must be in a visible location following installation.  
5. The thermostat's heat anticipator must be adjusted to match the total current draw of  
all controls associated with the boiler during a heating cycle.  
PAGE11  
CONNECTING GAS SERVICE  
1. Connect gas service from meter to control assembly in accordance with ANSI Z223.1  
and local codes or utility. A ground joint union should be installed for easy removal of gas  
control for servicing. A drip leg or trap must be installed at the bottom of a vertical section  
ofpipingattheinlettotheboiler.Apipecompoundresistanttotheactionofliquifiedpetroleum  
gasesmustbeusedonallthreadedpipeconnections. Checkwiththelocalutilityforlocation  
of manual shutoff valve if required. See figure 13 below.  
2. The gas line should be of adequate size to prevent undue pressure drop and never  
smaller than the pipe size of the main gas control valve. See chart below.  
3. To check for leaks in gas piping, use a soap and water solution or other approved  
method.  
WARNING: DO NOT USE AN OPEN FLAME.  
4. Disconnect the boiler from the gas supply piping system during any pressure testing  
of the gas piping. After reconnecting, leak test the gas connection and boiler piping before  
placing the boiler back into operation.  
Maximum Capacity of Pipe in  
Cubic Feet of Gas Per Hour  
(Gas pressure = 0.5 psig or less, pressure drop =  
.5 in.w/c)  
Nominal  
Iron Pipe  
Size  
Length of Pipe (Feet)  
10' 20' 30' 40' 60' 80' 100'  
1/2"  
3/4"  
1"  
175 120 97 82 66 57  
50  
360 250 200 170 138 118 103  
680 465 375 320 260 220 195  
1.1/4" 1400 950 770 660 530 460 400  
For additional information refer to “Table C” of the  
NationalFuelGasCodeHandbook.  
FIGURE13  
PAGE12  
ELECTRICAL WIRING  
SEE ADDENDUM " A" FOR WIRING DIAGRAMS  
AND COMPONENT CODING.  
ElectricalwiringmustconformwiththeNationalElectricalCode,ANSI/NFPANo.70-1990  
when installed in the United states, the CSA C22.1 Canadian Electrical Code, Part 1, when  
installed in Canada, and/or the local authority having jurisdiction.  
WARNING: 1.Whenanexternalelectricalsourceisutilized,theboiler,when  
installed MUST BE electrically grounded in accordance with these requirements.  
2. Install a fused disconnect switch between boiler and meter at a convenient location.  
THERMOSTAT INSTALLATION  
1. Thermostat should be installed on an inside wall about four feet above the floor.  
2. NEVER install a thermostat on an outside wall.  
3. Do not install a thermostat where it will be affected by:  
A. Drafts  
B. Hot or Cold Pipes  
C. Sun Light  
D. Lighting Fixture  
E.Television  
F. A Fireplace or Chimney  
4. Check thermostat operation by raising and lowering thermostat setting as required to  
start and stop the burners.  
5.Instructionsforthefinaladjustmentofthethermostatarepackagedwiththethermostat  
(adjusting heating anticipator, calibration, etc.)  
LIGHTING INSTRUCTIONS  
WARNING: IFYOUDONOTFOLLOWTHESEINSTRUCTIONSEXACTLY,  
A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL  
INJURY OR LOSS OF LIFE.  
Before any procedures are attempted on this appliance, it is necessary to  
determine if the ignition system is electric or standing pilot. If you are un-certain,  
contact the manufacturer before proceeding.  
CAUTION: Before lighting any type of pilot burner (standing or  
intermittent), make certain the hot water boiler and system are full of water to  
minimumpressureof12lbs.persquareinchinthesystem,andalsomakecertainthat  
the system is vented of air. Set the operating control of thermostat to a “below”  
normal setting. Refer to the following appropriate lighting instruction.  
PAGE13  
LIGHTING PROCEDURE FOR BOILER WITH  
INTERMITTENT PILOT SYSTEMS.  
FOR YOUR SAFETY READ BEFORE OPERATING.  
A. This appliance is equipped with an ignition device which automatically lights the pilot.  
Do not try to light the appliance by hand.  
B. Before operating, smell all around the appliance area for gas. Be sure to smell next  
to the floor because some gas is heavier than air and will settle on the floor.  
CAUTION: WHAT TO DO IF YOU SMELL GAS  
* Do not try to light any appliance.  
* Do not touch any electrical switches; do not use any phones in your building.  
* Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier's  
instructions.  
* If you cannot reach your gas supplier, call the fire department.  
C. Useonlyyourhandtopushinorturnthegascontrolknob. Neverusetools. Iftheknob  
will not push in or turn by hand, don’t try to repair it. Call a qualified service technician. Force  
or attempted repair may result in a fire or explosion.  
D.Donotusethisapplianceifanyparthasbeenunderwater.Immediatelycallaqualified  
service technician to inspect the appliance and to replace any part of the control system and  
any gas control which has been under water.  
OPERATING INSTRUCTIONS FOR  
INTERMITTENT PILOT SYSTEMS  
1. STOP! Read the safety information in the User’s Information Manual.  
2. Set the thermostat to lowest setting.  
3. Turn off 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. See figure 14 below.  
5. Remove access panel.  
6. Turn gas control knob clockwise  
7. Wait (5) minutes to clear out any gas.  
If you then smell gas, STOP!Follow “What  
To Do If You Smell Gas” in the safety  
informationabove.Ifyoudon’tsmellgas,go  
on to the next step.  
to “OFF”.  
8.Turngascontrolknobcounterclockwise  
to “ON”.  
9. Replace access 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 off gas to  
appliance”, on page 16, and call a qualified  
service technician or your gas supplier.  
FIGURE14  
PAGE14  
LIGHTING PROCEDURE FOR BOILER  
WITH CONTINUOUS PILOT  
FOR YOUR SAFETY READ BEFORE LIGHTING  
A. Read the warning at the beginning of the LIGHTING INSTRUCTIONS. (Page 13)  
B.Thisappliancehasapilotwhichmustbelightedbyhand.Whenlightingthepilot,follow  
these instructions exactly.  
C. Before lighting, smell all around the appliance area for gas. Be sure to smell next to  
the floor because some gas is heavier than air and will settle on the floor. See page 14 for  
WHAT TO DO IF YOU SMELL GAS.  
D.Useonlyyourhandtopushinorturngascontrolknoborresetbutton.Neverusetools.  
If the knob or reset button will not push in or turn by hand, don’t try to repair it, call a qualified  
service technician. Force or attempted repair may result in a fire or explosion.  
E.Donotusethisapplianceifanyparthasbeenunderwater.Immediatelycallaqualified  
service techniciantoinspecttheapplianceandtoreplaceanypartofthecontrolsystemand  
any gas control which has been under water.  
LIGHTING INSTRUCTIONS FOR  
CONTINUOUS PILOT  
1. STOP! Read the safety information at the beginning of these instructions.  
2. Set the thermostat to the lowest setting.  
3. Turn off all electric power to the appliance.  
4. Remove access panel and burner door.  
5. Turn gas control knob clockwise  
to "OFF". See figure's 15 & 16 below.  
NOTE #1: Some gas control knobs cannot be turned from "PILOT" to "OFF" unless  
knob is pushed in slightly. DO NOT FORCE.  
FIGURE15  
FIGURE16  
6. Wait (5) minutes to clear out any gas. If you then smell gas, STOP! Follow “What To  
Do If You Smell Gas”, on page 14. If you don't smell gas, go to the next step.  
7. Find pilot. Follow metal tube from gas control. Depending on the model of the boiler,  
pilot is either mounted on the base or on one of the burner tubes.  
8. Turn gas control knob counterclockwise  
to "PILOT".  
PAGE15  
9. Push in gas control knob or reset button if so equipped, all the way in and hold.  
Immediatelylightthepilotwithamatch. Continuetoholdthegascontrolknoborresetbutton  
in for about 1 minute after the pilot is lit. Release knob or button, and it will pop up back up.  
Pilot should remain lit. If it goes out, repeat steps 5 through 9.  
*Ifknoborbuttondoesnotpopupwhenreleased,stopandimmediatelycallaqualified  
service technician or your gas supplier.  
* If the pilot will not stay lit after several tries, turn the gas control knob clockwise  
to "OFF". (See note #1), and call a qualified service technician or your gas supplier.  
10. Replace burner door.  
11. Turn gas control knob counterclockwise  
12. Replace access panel.  
to "ON".  
13. Turn on all electric power to the appliance.  
14. Set thermostat to desired setting.  
TO TURN OFF GAS TO APPLIANCE  
1. Set the thermostat to lowest setting.  
2. Turn off all electric power to the appliance if service is to be performed.  
3. Push in gas control knob slightly and turn clockwise  
NOT FORCE.  
to "OFF", DO  
5. Call a qualified service technician.  
NORMAL SEQUENCE OF OPERATION  
On a call for heat, the thermostat will actuate, completing the circuit to the aquastat. The  
completed circuit to the aquastat will first activate the circulator and damper which will close  
an end switch inside the damper. This action will complete the circuit to the ignition system  
and ignition will take place.  
In the event the boiler water temperature exceeds the high limit setting on the boiler  
mounted aquastat, power will be interrupted between the aquastat and the ignition system.  
Thepowerwillremainoffuntiltheboilerwatertemperaturedropsbelowthehighlimitsetting.  
The circulator will continue to operate under this condition until the thermostat is satisfied.  
In the event the flow of combustion products through the boiler venting system becomes  
blocked, theblockedventsafetyswitchwillshutthemainburnergasoff. Seefigure18, page  
17. Similarly, if the boiler flueway becomes blocked, a flame rollout safety switch will shut  
the main burner gas off. See figuer 18, page 17. If either of these conditions occur, do not  
attempt to place the boiler back into operation. Contact a qualified service agency.  
PAGE16  
GENERAL INSTRUCTIONS  
Beforeseasonalstart-up,haveacompetentserviceagencychecktheboilerforsootand  
scale in the flues, clean the burners and check the gas input rate to maintain high operating  
efficiency.  
CAUTION: Label all wires prior to disconnection when servicing controls.  
Wiring errors can cause improper and dangerous operation.  
Verify proper operation after service.  
The service agency or owner should make certain the system is filled with water to  
minimum pressure and open air vents, if used, to expel any air that may have accumulated  
in the system. Check the entire piping system and if any leaks appear, have them repaired.  
Many circulators like the one pictured in figure 17 below, require periodic servicing. The  
motorusuallyhasopeningsateachendtolubricatethebearings.Putaboutonehalfteaspoon  
of SAE 20 or 30 non-detergent motor oil in each opening twice a year.  
CAUTION: DO NOT OVER OIL.  
FIGURE17  
FIGURE18  
Manycirculatorshaveanoilopeningfortheshaftbearing.Thisshouldbeoiledatthesame  
time for quiet operation. Follow the manufacturer's instructions for oiling the shaft bearing.  
The venting system should be inspected at the start of each heating season. Check the  
vent pipe from the boiler to the chimney for signs of deterioration by rust or sagging joints.  
Repair if necessary. Remove the vent pipe at the base of the chimney or flue and using a  
mirror, check vent for obstruction and make certain the vent is in good working order.  
Theboilerfluegaspassagewaysmaybeinspectedbyalightandmirror. Removetheburner  
door,figure18.Placeatroublelampinthefluecollectorthroughthedraftreliefopening.With  
PAGE17  
the mirror positioned above the burners, the flue gas passageways can be checked for soot  
or scale.  
The following procedure should be followed to clean the flue gas passageways:  
1. Remove the burners from the combustion chamber by raising the burners up from the  
manifold orifices and pulling toward the front of the boiler. See figure 18 on page 17.  
2. Disconnect the vent pipe from the draft hood.  
3. Remove the top jacket panel.  
4. Remove the combination flue collector and draft hood from the boiler castings by  
loosening the nuts on the hold down bolts located on each side of the collector. See figure  
18 on page 17.  
5. Place a sheet of heavy paper or similar material over the bottom of the base and brush  
down the flue passageways. The soot and scale will collect on the paper and is easily  
removed with the paper.  
With the paper still in place in the base, clean the top of the boiler castings of the boiler  
puttyorsiliconeusedtosealbetweenthecastingsandfluecollector.Makecertainthatchips  
are not lodged in the flue passageways.  
When the cleaning process is complete, restore the boiler components to their original  
position. Use boiler putty or IS-808 GE silicone, available from a Utica Boilers distributor, to  
seal around the flue collector and boiler castings.  
FIGURE19  
FIGURE20  
A visual check of the main burner and pilot flames should be made at the start of the  
heatingseasonandagaininmid-season. Themainburnerflameshouldhaveawelldefined  
innerbluemantelwithalighterblueoutermantel.Checktheburnerthroatsandburnerorifices  
for lint or dust obstruction. See figures 19 and 20 above.  
Thepilotflameshouldenvelop3/8to1/2inchofthetipofthepilotthermocouple, ignition/  
sensing electrode or mercury sensor. See figure 21 on page 19. To adjust the pilot flame,  
remove the pilot adjustment cover screw (figures 14, 15, & 16 on pages 14 & 15), and turn  
the inner adjustment screw counterclockwise  
to increase or clockwise  
to decrease pilot flame. Be sure to replace cover screw after adjustment to prevent possible  
gas leakage.  
PAGE18  
The burners and pilot should be checked for signs of corrosion, rust or scale buildup.  
The area around the boiler must be kept clear and free of combustible materials, gasoline  
and other flammable vapors and liquids.  
The free flow of combustion and ventilating air to the boiler and boiler room must not be  
restricted or blocked.  
It is recommended that a qualified service agency be employed to make an annual  
inspectionoftheboilerandheatingsystem.Theyareexperiencedinmakingtheinspections  
outlined above, and, in the event repairs or corrections are necessary, trained technicians  
can make the proper changes for safe operation of the boiler.  
FIGURE21  
FIGURE22  
CHECKING GAS INPUT RATE TO BOILER  
Gas input to the boiler can be adjusted by removing the protective cap on the pressure  
regulator, (See figures 14, 15, & 16 on pages 14 & 15), and turning the screw clockwise  
to increase input and counterclockwise  
to decrease input. Natural gas  
manifold pressure should be set at approximately 3.5 inches water column. Propane gas  
manifoldpressureshouldbesetatapproximately11.0incheswatercolumn.Thesemanifold  
pressures are taken at the outlet side of the gas valve. See figures15 & 17 on pages14 &  
15. To check for proper flow of natural gas to the boiler, divide the input rate shown on the  
rating plate by the heating value of the gas obtained from the local gas company. This will  
determine the number of cubic feet of gas required per hour. With all other gas appliances  
off, determine the flow of gas through the meter for two minutes and multiply by 30 to get  
the hourly rate. Make minor adjustments to the gas input as described above.  
Burner orifices should be changed if the final manifold pressure varies more than plus or  
minus 0.3 inches water column from the specified pressure.  
Primaryairadjustmentisnotnecessary, thereforeairshuttersarenotfurnishedasstandard  
equipment. Air shutters can be furnished on request where required by local codes or  
conditions.  
PAGE19  
CHECKSAFETYCONTROLCIRCUIT, afterburneradjustmentsaremade,forsatisfactory  
operation.  
1. Pilot: With main burner operating, turn the pilot gas adjusting screw clockwise  
until pilot gas is turned off. See figures 14, 15, & 16 on pages 14 & 15. Within 90 seconds  
the main gas control should close, shutting off the gas to the main burner.  
2. High limit control (figure 22 on page 19). Remove cover and note temperature setting.  
Decrease this setting to minimum and operate boiler. When the boiler water temperature  
exceeds the control temperature setting, the control will open the circuit, closing the  
automatic main gas valve.  
MGB SERIES REPLACEMENT PARTS  
ROLLOUT & SPILL SWITCH  
ITEM  
NO.  
PART  
NO.  
DESCRIPTION  
OTY.  
1
2
3262001  
AQ02101  
TEMP. SENSOR BRACKET  
CONTROL-FIXEDTEMPERATURE  
THERMO (ROLLOUT SWITCH)  
SCREW - #6 X1/4 HEX HD  
1
1
3
HW06501  
2
THE ROLLOUT SWITCH IS LOCATED ON THE BASE AND FLUE COLLECTOR  
NOTE: THE QUANTITIES ABOVE ARE FOR EACH SWITCH.  
FIGURE23  
PAGE20  
MGB SERIES REPLACEMENT PARTS - PILOTS  
ITEM  
#
PART  
NUMBER  
ITEM  
#
PART  
NUMBER  
DESCRIPTION  
OTY.  
DESCRIPTION  
OTY.  
1
4
32622001  
PILOT BRACKET ASSY 24V  
1
2
3
1520001  
THERMOCOUPLEQ309A  
1
4
1
(THIS INCLUDES #5 & 2 SCREWS)  
PILOTSHIELD  
HW-009.01 SCREW#8-18X1/2  
PB-011.03 PILOTSTDGQ380NAT  
PB-011.04 PILOT STDG Q380 LP  
5
6
3261401  
1
1
MS-003.03 PILOTTUBE1/4"X20.1/2"AL.  
FIGURE24  
ITEM  
#
PART  
NUMBER  
ITEM  
#
PART  
NUMBER  
DESCRIPTION  
OTY.  
DESCRIPTION  
OTY.  
3
4
5
HW-009.01 SCREWS#8-18X1/2  
2
1
1
1
2
32623601  
PILOTBRACKETASSYSPARK 1  
PB00702  
PILOTIGNITIONCABLE30"  
PB-011.01 PILOTSPARKQ381NAT  
PB-011.02 PILOT SPARK Q381 LP  
1
MS-003.03 PILOTTUBE1/4"X20.1/2"AL.  
FIGURE25  
PAGE21  
MGB SERIES REPLACEMENT PARTS - BASE  
ITEM PART  
NUMBER  
ITEM PART  
NUMBER  
#
DESCRIPTION  
OTY.  
#
DESCRIPTION  
OTY.  
1
6
VG-003.05 GASVALVEVR8200H  
MGB50-15024VNAT  
1
3352401  
BURNERTUBE1.3/4"  
MGB50(1)  
MGB125(3)  
MGB200(4)  
5611601  
5611602  
5611603  
5611604  
5611605  
5611606  
3261201  
3262701  
3262801  
32621001  
32621002  
32621003  
MGB75(2)  
MGB150(3)  
MGB250(5)  
MGB100(2)  
MGB175(4)  
MGB300(6)  
VG00307  
VG01101  
VG01103  
VG01104  
VG01201  
VG01202  
GASVALVEVR8200H  
MGB50-30024VLP  
GASVALVEVR8204H  
MGB50-150SPARKNAT  
GASVALVEVR8304H4  
MGB175-300SPARKNAT  
GASVALVEVR8304  
MGB50-300SPARKLP  
GASVALVEVR8300H4  
MGB250&30024VNAT  
GASVALVEVR8300H4  
MGB175&20024VNAT  
2
BASEW/INSULMGB50  
1
1
1
4
BASEW/INSULMGB75&100  
BASEW/INSULMGB125&150  
BASEW/INSULMGB175&200  
BASEW/INSULMGB225&250  
BASEW/INSULMGB275&300  
BURNERDOORMGB50  
BURNERDOORMGB75&100  
BURNERDOORMGB125&150  
BURNERDOORMGB175&200  
BURNERDOORMGB250  
BURNERDOORMGB300  
3
4
5
7
355-1-5.01 ORIFICE #30 NAT  
MGB50, 100, 150, 200, 250, & 300  
1
355-1-5.02 ORIFICE #31 NAT  
MGB125&175  
355-1-5.03 ORIFICE #33 NAT MGB75  
355-1-5.04 ORIFICE#47LP  
MGB50, 100, 150, 200, 250, & 300  
355-1-5.06 ORIFICE#49LPMGB125&175  
355-1-5.07 ORIFICE#50LPMGB75  
356-2-1.01 MANIFOLDMGB50  
356-2-1.02 MANIFOLDMGB75&100  
356-2-1.03 MANIFOLDMGB125&150  
356-2-1.04 MANIFOLDMGB175&200  
356-2-1.05 MANIFOLDMGB225&250  
356-2-1.0\6 MANIFOLDMGB275&300  
HW-005.01 SCREW 1/4-20X1/2 SELF TAP  
FIGURE26  
PAGE22  
MGB SERIES REPLACEMENT PARTS - JACKETS  
ITEM  
#
PART  
NUMBER  
ITEM  
#
PART  
NUMBER  
DESCRIPTION  
OTY.  
1
DESCRIPTION  
OTY.  
6
7
3162705  
PANEL-RIGHTMGB50-200  
PANEL-RIGHTMGB225-300  
PANEL-REARMGB50  
PANEL - REAR MGB75 & 100  
PANEL - REAR MGB125 & 150  
PANEL - REAR MGB175 & 200  
PANEL - REAR MGB225 & 250  
PANEL - REAR MGB275 & 300  
FLUECOLMGB50  
FLUECOLMGB100  
FLUECOLMGB150  
FLUECOLMGB200  
FLUE COL MGB225 & 250  
FLUE COL MGB275 & 300  
FLUECOLMGB125  
FLUECOLMGB75  
FLUECOLMGB175  
1
1
1
31621501  
31621502  
31621503  
31621504  
31621505  
31621506  
31621507  
3162704  
3162706  
3162707  
3162708  
PANEL-TOPMGB50  
PANEL - TOP MGB75 & 100  
PANEL-TOPMGB125  
3162703  
3162601  
3162602  
3162603  
3162604  
3162605  
3162606  
3462101  
3462102  
3462103  
3462104  
3462105  
3462106  
3462107  
3462108  
3462109  
1182004  
1182005  
1182006  
1182007  
1182008  
1182009  
PANEL-TOPMGB150  
PANEL - TOP MGB175 & 200  
PANEL - TOP MGB225 & 250  
PANEL - TOP MGB275 & 300  
PANEL-LEFTMGB225-300  
PANEL-LEFTMGB(L)50-200  
PANEL-LEFTMGB(L)225-300  
PANEL-LEFTMGB50-200  
2
3
1
1
8
1
3162501 DRAFTDEFLECTORMGB50  
3162502 DRAFTDEFLECTORMGB75/100  
3162503 DRAFTDEFLECTORMGB125/150  
3162504 DRAFTDEFLECTORMGB175/200  
3162505 DRAFTDEFLECTORMGB225/250  
3162506 DRAFTDEFLECTORMGB275/300  
9
DAMPER4"MGB50  
DAMPER5"MGB75  
1
4
5
3161101  
3161102  
3161103  
3161104  
3161105  
3161106  
3161201  
3161202  
3161203  
3161204  
3161205  
3161206  
PNL LWR ACCES MGB50  
1
1
PNLLWRACCESMGB75/100  
PNLLWRACCESMGB125/150  
PNLLWRACCESMGB175/200  
PNLLWRACCESMGB225/250  
PNLLWRACCESMGB275/300  
PANEL-BASEMGB50  
PANEL - BASE MGB75 & 100  
PANEL - BASE MGB125 & 150  
PANEL-MGB175&200  
DAMPER6"MGB100&125  
DAMPER7"MGB150&175  
DAMPER 8" MGB200, 225, &250  
DAMPER 9" MGB 275 & 300  
PNL-UPPERACCESSMGB50  
PNL-UPPERACCESSMGB75&100  
PNL-UPPERACCESSMGB125  
PNL-UPPERACCESSMGB150  
PNL-UPPERACCESSMGB175&200  
PNL-UPPERACCESSMGB225&250  
PNL-UPPERACCESSMGB275&300  
10 31621201  
31621202  
31621203  
31621204  
31621205  
31621206  
31621207  
1
PANEL-BASEMGB225&250  
PANEL - BASE MGB275 & 300  
FIGURE27  
PAGE23  
MGB SERIES REPLACEMENT PARTS  
HEAT EXCHANGER  
ITEMNO  
P/N  
DESCRIPTION  
QTY.  
1
1
2
100-2-2.01  
100-2-1.01  
B-LEFTHANDSECTION  
B-CENTERSECTION  
MGB50 (0)  
MGB150(2)  
MGB250(4)  
MGB75 (1)  
MGB175(3)  
MGB275(5)  
MGB100(1)  
MGB125(2)  
MGB225(4)  
MGB200(3)  
MGB300(5)  
3
4
100-2-3.01  
HW-011.01  
HW-011.03  
HW-011.05  
HW-011.07  
HW-011.09  
HW06901  
B-RIGHTSECTION  
1
2
TIEROD1/4X11.1/2MGB75&100  
TIEROD1/4X15.1/2MGB125&150  
TIEROD1/4X19.1/2MGB175&200  
TIE ROD 1/4X23 MGB225 & 250  
TIE ROD 1/4X27 MGB275 & 300  
NUT5/16-18WISLOCK  
5
6
6
43300976  
PUSHNIPPLE2"MACH.  
MGB100(4)  
MGB50 (2)  
MGB150(6)  
MGB250(10)  
MGB75 (4)  
MGB175(8)  
MGB275(12)  
MGB125(6)  
MGB225(10)  
MGB200(8)  
MGB300(12)  
7
3461601  
BAFFLE (USED ON MGB75 & MGB175 ONLY)  
MGB175(4)1perflueway  
MGB75(4)2perflueway  
HW-008.01  
8
9
WASH-5/16FLATSTLZP  
NUT-1/4-20HEX-STLZP  
4
2
HW-003.02  
FULLY ASSEMBLED HEAT EXCHANGERS  
100-2-7.01  
100-2-7.02  
100-2-7.03  
100-2-7.04  
100-2-7.05  
100-2-7.06  
HEATEXCHANGER3SECTION  
HEATEXCHANGER4SECTION  
HEATEXCHANGER5SECTION  
HEATEXCHANGER6SECTION  
HEATEXCHANGER7SECTION  
HEATEXCHANGER2SECTION  
FIGURE28  
PAGE24  
MGB SERIES REPLACEMENT PARTS  
PIPING & CONTROLS  
ITEMNO  
P/N  
DESCRIPTION  
QTY.  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
37513301  
37413602  
PB00702  
PF-006.07  
HW-016.03  
PF-008.03  
PF-006.01  
375-1-14.01  
37519501  
1010002  
VR-001.01  
AQ-020.01  
GA-001.00  
PF-005.11  
PF-002.04  
EF03601  
WIREROLLOUT/SPILL28"  
HARNESS IGN TO G/V 18"  
PILOTIGNITIONCABLE30"  
PIPE - NPL 1.1/4X4.1/2 NPT  
DRAIN-SHORT  
PIPE - TEE 1.1/4X3/4X1.1/4  
PIPE - 1.1/4" CLOSE NPL  
WIRELOWVOLTAGE/DAMPER  
HARNESSCIRCULATOR72"  
CONTROLL8148E1257(AQUASTAT)  
RELIEF VALVE 30#  
WELL 3/4"X3"  
GAUGE-THERALTIMETER  
PIPE - NPL 3/4"X4"  
PIPE - ELBOW 3/4" 90°  
CLAMP #3600 WHITE  
PLT SPARK CTRL S8600  
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
PB00604  
FIGURE29  
PAGE25  
RATINGS AND D  
                                                                    
A
                                                                    
                                                                      
T
                                                                      
                                                                        
A
                                                                        
OPANE GAS  
NATURAL GAS AND PR  
§
§
§ **  
Natural Propane  
Boiler  
No.  
A.G.A. Heating  
I=B=R  
NetRating  
No.  
Recommended  
Gas  
Orifice  
Drill Size  
30  
Orifice Water  
Input Capacity NetOutput Sq. Ft. HW  
of  
Air Cushion  
Drill  
Size  
47  
Content  
(Gals.)  
2.4  
Btu/Hr. Btu/Hr.  
50,000 42,000  
75,000 63,000  
Btu/Hr  
37,000  
55,000  
72,000  
90,000  
@ 170o  
Burners  
Tank  
15  
15  
30  
30  
30  
30  
30  
30  
60  
MGB50  
MGB75  
243  
1
2
2
3
3
4
4
5
6
365  
33  
50  
4.0  
MGB100 100,000 83,000  
MGB125 125,000 104,000  
481  
30  
47  
4.0  
603  
31  
49  
5.6  
MGB150 150,000 124,000 108,000  
MGB175 175,000 143,000 124,000  
MGB200 200,000 165,000 143,000  
MGB250 250,000 205,000 178,000  
MGB300 299,999 243,000 214,000  
719  
30  
47  
5.6  
829  
31  
49  
7.2  
957  
30  
47  
7.2  
1189  
1368  
30  
47  
8.8  
30  
47  
10.4  
STANDARDEQUIPMENT:BoilerJacket,CastIronBoilerBattery,CombinationAquastatRelay,Theraltimeter  
Gauge,Circulatorwithreturnpipingtoboiler,MainGasBurners,Combination24VoltGasControl(includes  
automaticgasvalve,gaspressureregulator,automaticpilot,safetyshutoff,pilotflowadjustment,pilotfilter),  
A.S.M.E. Relief Valve, Drain Cock, Spill Switch, Rollout Switch, Automatic Vent damper. Not shown are  
a wiring harness, thermocouple, and non-linting safety pilot.  
OPTIONAL EQUIPMENT: Intermittent Electric Ignition Pilot System.  
EXPLANATORYNOTES  
--All boilers are design certified for installation on noncombustible floor.  
--For installation on combustible floors use combustible floor kit.  
--Recommended chimney height 20 feet. In special cases where conditions permit, chimney height may  
be reduced to 10 feet. Refer to the latest revision of NFGC part 11.  
--Electric service to be 120 Volts, 15 Amps, 60 Hz.  
--The MEA number for the MGB series boiler is 19-79 Vol. II  
§
For elevations above 2000 feet, ratings should be reduced at a rate of 4% for each 1000 feet above sea  
level.  
Tank sized for non-ferrous baseboard or radiant panel systems. Increase size for cast iron baseboard  
and radiation.  
Base on 170' temperature in radiators.  
--Net I=B=R ratings include 15% allowance for normal piping and pick-up load. Manufacturer should be  
consulted on installations having otherthan normal piping and pick-up requirements.  
**For equivalent square feet of radiation, divide I=B=R output by 150.  
PAGE26  
MGB SERIES  
ATURAL GAS AND PR  
OPANE GAS  
DIMENSIONS FOR N  
Pumpsize  
Supply &  
Return  
*
Boiler  
No.  
Natural  
Gas  
Inlet  
1/2"  
1/2"  
1/2"  
1/2"  
1/2"  
1/2"  
1/2"  
3/4"  
3/4"  
Dimensions  
A
B
C
D
E
F
Tappings  
1.1/4"  
1.1/4"  
1.1/4"  
1.1/4"  
1.1/4"  
1.1/4"  
1.1/4"  
1.1/4"  
1.1/4"  
MGB 50  
11.1/8"  
15  
5.1/2"  
7.1/2"  
7.1/2"  
9.1/2"  
9.1/2"  
4"  
5"  
6"  
6"  
7"  
7"  
8"  
8"  
9"  
30.3/4" 36.1/4"  
30.3/4" 37.3/4"  
6"  
6"  
MGB 75  
MGB 100  
MGB 125  
MGB 150  
MGB 175  
MGB 200  
MGB 250  
MGB 300  
15  
30.3/4" 37.1/4" 6.1/2"  
30.3/4" 37.1/4" 6.1/2"  
18.7/8"  
18.7/8"  
30.3/4" 37.3/4"  
30.3/4" 38.3/4"  
30.3/4" 38.3/4"  
32.3/4" 40.3/4"  
32.3/4" 42.3/4"  
7"  
7"  
22.3/4" 11.3/8"  
22.3/4" 11.3/8"  
265.8" 13.1/4"  
30.1/2" 15.1/4"  
8"  
8"  
10"  
Propane gas inlet, all units, 1/2"  
*
Solutions you can be comfortable with.  
37611601  
PAGE 27  
REV 14.1, May 2004  

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