UTICA BOILERS MGB50 Installation, Operation & Maintanance Manual
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UTICA BOILERS MGB50 Installation, Operation & Maintanance Manual

Mgb series cast iron gas fired boilers for forced hot water
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National Excelsior Company
www.excelsiorhvac.com
MODEL NUMBERS:
MGB50
MGB75
MGB125
MGB150
MGB200
MGB250
An ISO 9001-2000 Certified Company
MGB100
MGB175
MGB300
UTICA BOILERS
P.O. Box 4729
Utica, NY 13504-4729
MEMBER: The Hydronics Institute
R
Subject to change without notice.
MGB SERIES
Cast Iron Gas Fired Boilers
For Forced Hot Water
INSTALLATION, OPERATION &
MAINTANANCE MANUAL
37611601
P/N
, Rev. B [02/09]

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  • Page 1 MAINTANANCE MANUAL MODEL NUMBERS: MGB50 MGB75 MGB100 MGB125 MGB150 MGB175 MGB200 MGB250 MGB300 UTICA BOILERS P.O. Box 4729 Utica, NY 13504-4729 37611601 An ISO 9001-2000 Certified Company MEMBER: The Hydronics Institute , Rev. B [02/09] Subject to change without notice.

  • Page 2: Table Of Contents

    National Excelsior Company www.excelsiorhvac.com INSTALLATION MANUAL AND OPERATING INSTRUCTIONS TABLE OF CONTENTS IMPORTANT: Read the following instruc- Ratings & Data - Natural Gas & Propane Gas ...3 tions COMPLETELY before installing!! Installation Procedure .........4 Ventilation & Combustion Air ......5 Connecting Supply & Return Piping ....7 WARNING Vent Installation ..........

  • Page 3: Ratings & Data - Natural Gas & Propane Gas

    National Excelsior Company www.excelsiorhvac.com RATINGS & DATA - NATURAL GAS & PROPANE GAS EXPLANATORY NOTES --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.

  • Page 4: Installation Procedure

    National Excelsior Company www.excelsiorhvac.com INSTALLATION PROCEDURE WARNING Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. The installation must conform to the requirements of the FOR INSTALLATION ON NON-COMBUSTIBLE authority having jurisdiction or, in the absence of such FLOORS ONLY - For installation on combustible flooring requirements, to the latest revision of the National Fuel special base must be used.

  • Page 5: Ventilation & Combustion Air

    National Excelsior Company www.excelsiorhvac.com VENTILATION & COMBUSTION AIR WARNING Air openings to combustion area must not be obstructed. By following the instructions below, adequate combustion air can be maintained. In this case air for combustion and ventilation shall be COMBUSTION AIR REQUIREMENTS provided according to Step 5.
  • Page 6 National Excelsior Company www.excelsiorhvac.com VENTILATION AND COMBUSTION AIR If horizontal ducts are used, each opening and duct shall When directly communicating with the outdoors, each have a minimum free area 1 square inch per 2,000 Btu opening shall have a minimum free area of 1 square inch per hour of total input rating of all appliances in the en- per 4,000 Btu per hour of total input rating of all equip- closed space.

  • Page 7: Connecting Supply & Return Piping

    National Excelsior Company www.excelsiorhvac.com CONNECTING SUPPLY & 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. Figure #5 PRESSURE REDUCING VALVE GATE VALVE SUPPLY PIPING TO HEATING AND COOLING...
  • Page 8 National Excelsior Company www.excelsiorhvac.com CONNECTING SUPPLY AND RETURN PIPING Figure #6 FROM SYSTEM TO SYSTEM WATER INLET EXPANSION TANK BYPASS PIPING - AUTOMATIC MIXING VALVE BOILER ALTERNATE CIRCULATOR LOCATION PRESSURE BALL VALVE AIR SEPARATOR CIRCULATOR REDUCER VALVE SHUT-OFF 3 WAY MIXING CHECK VALVE HOSE BIB VALVE...
  • Page 9 National Excelsior Company www.excelsiorhvac.com CONNECTING SUPPLY AND RETURN PIPING Figure #7 SINGLE ZONE SYSTEM WITH CH CIRCULATOR DHW PRIORITY WATER INLET EXPANSION TANK CIRCULATOR BOILER PRIORITY ZONE PRESSURE BALL VALVE CIRCULATOR HOSE BIB REDUCER VALVE AIR SEPARATOR FLOW CONTROL SHUT-OFF ZONE VALVE CHECK VALVE VAVLE...
  • Page 10 National Excelsior Company www.excelsiorhvac.com CONNECTING SUPPLY AND RETURN PIPING Figure #9 ZONE 4 MULTIZONE SYSTEM WITH ZONE VALVES AND DHW PRIORITY (WITH CIRCULATOR) ZONE 3 *USE FULL PORT ZONE VALVE. ZONE 2 CIRCULATOR ZONE 1 (PRIORITY ZONE) WATER INLET CIRCULATOR BOILER EXPANSION TANK...

  • Page 11: Vent Installation

    National Excelsior Company www.excelsiorhvac.com VENT INSTALLATION WARNING All installations of boilers and venting should be done only by a qualified expert and in accordance with the appropriate 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 poison- ous gases such as carbon monoxide with is odorless and invisible.

  • Page 12: Vent Damper Installation & Instructions

    National Excelsior Company www.excelsiorhvac.com VENT SYSTEM MODIFICATION should be corrected so the installation conforms with the latest revision of the National Fuel Gas Code, ANSI Z223.1. 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 ap- propriate tables in the latest revision of the National Fuel Gas Code, ANSI Z223.

  • Page 13: Connecting Gas Service

    National Excelsior Company www.excelsiorhvac.com CONNECTING GAS SERVICE Connect gas service from meter to control assembly in accordance with ANSI Z223.1 and local codes or utility. MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS/HOUR (Gas Pressure = 0.5 psig or less, Pressure Drop = 5 in. w/c) A ground joint union should be installed for easy removal of gas control for servicing.

  • Page 14: Wiring Diagram - 24V Standing Pilot

    National Excelsior Company www.excelsiorhvac.com WIRING DIAGRAM - 24V STANDING PILOT Subject to change without notice.

  • Page 15: Wiring Diagram - Intermittent Ignition

    National Excelsior Company www.excelsiorhvac.com WIRING DIAGRAM - INTERMITTENT IGNITION Subject to change without notice.

  • Page 16: Lighting Instructions

    National Excelsior Company www.excelsiorhvac.com LIGHTING INSTRUCTIONS WARNING IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY, 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.
  • Page 17 National Excelsior Company www.excelsiorhvac.com LIGHTING INSTRUCTIONS LIGHTING PROCEDURE FOR BOILER WITH Figure #16 CONTINUOUS PILOT PRESSURE REGULATOR For Your Safety, Read Before Lighting!! ADJUSTMENT BENEATH INLET OUTLET COVER SCREW PRESSURE PRESSURE Read the warning at the beginning of " Lighting Instruc- tions."...

  • Page 18: Normal Sequence Of Operation

    National Excelsior Company www.excelsiorhvac.com NORMAL SEQUENCE OF OPERATION Figure #17 On a call for heat, the thermostat will actuate, completing the circuit to the control. The completed circuit to the control will first activate the circulator and damper which will close an end switch inside the damper.
  • Page 19 National Excelsior Company www.excelsiorhvac.com GENERAL INSTRUCTIONS With the paper still in place in the base, clean the top of Figure #21 the boiler castings of the boiler putty or silicone used to seal between the castings and flue collector. Make certain 3/8”...

  • Page 20: Checking Gas Input Rate To Boiler

    National Excelsior Company www.excelsiorhvac.com CHECKING GAS INPUT RATE TO BOILER Gas input to the boiler can be adjusted by removing the protective cap on the pressure regulator (Figures #14-#16) and turning the screw clockwise to increase input and Figure #22 counterclockwise to decrease input.
  • Page 21 National Excelsior Company www.excelsiorhvac.com Subject to change without notice.

  • Page 22: Replacement Parts

    National Excelsior Company www.excelsiorhvac.com REPLACEMENT PARTS - BASE Item Item Description Part # Qty. Description Part # Qty. BURNER TUBE 1 1/2" - 50 SCREW ¼ - 20 X ½ SELF TAP HW-005.01 BURNER TUBE 1 1/2" - 75, 100 GAS VALVE VR8200H - 50 - 150 24V NAT VG-003.05 BURNER TUBE 1 1/2"...
  • Page 23 National Excelsior Company www.excelsiorhvac.com REPLACEMENT PARTS - HEAT EXCHANGER Item Part No. Description Qty. Item Part No. Description Qty. Nut 5 /16 - 18 Wislock 100-2-2.01 Left Hand Section HW06901 Push Nipple 2” Mach. (050) 14605001 Tie Rod - ¼” x 7¼” (045) HW-011.01 Tie Rod - ¼”...
  • Page 24 National Excelsior Company www.excelsiorhvac.com REPLACEMENT PARTS - JACKET Item Item DESCRIPTION Part Number Qty. DESCRIPTION Part Number Qty. PANEL - TOP 50 31621501 PANEL - RIGHT 50-200 3162705 PANEL - RIGHT 225-300 3162703 PANEL - TOP 75 & 100 31621502 PANEL - REAR 50 3162601 PANEL - TOP 125...
  • Page 25 National Excelsior Company www.excelsiorhvac.com REPLACEMENT PARTS - PILOT SPARK PILOT Item Part No. Description Qty. 109007296 PILOT BRACKET ASSEMBLY HW-005.01 BRACKET SCREW 240007093 SPARK CABLE PILOT TUBING, 1/8" x 24" 14615005 PB-001.02 Natural Gas Q345A PILOT 240007096 LP Q345A Pilot * Included with #3 - Pilot Tube Assembly Kit (above) CONTINUOUS PILOT Item...
  • Page 26 National Excelsior Company www.excelsiorhvac.com REPLACEMENT PARTS - PIPING & CONTROLS ITEM DESCRIPTION QTY. WIRE ROLLOUT/SPILL 28" 37513301 HARNESS IGN TO G/V 18" 37413602 PILOT IGNITION CABLE 30" PB00702 PIPE - NPL 1.1/4X4.1/2 NPT PF-006.07 DRAIN - SHORT HW-016.03 PIPE - TEE 1.1/4X3/4X1.1/4 PF-008.03 PIPE - 1.1/4"...
  • Page 27 National Excelsior Company www.excelsiorhvac.com ROLLOUT & SPILL SWITCH Item # Description Part # Qty. TEMP. SENSOR BRACKET 3262001 CONTROL-FIXED TEMPERATURE AQ02101 THERMO (ROLLOUT SWITCH) SCREW - #6 X ¼ HEX HD HW06501 The rollout switch is located on the base and flue collector. NOTE: The quantities above are for each switch.
  • Page 28 National Excelsior Company www.excelsiorhvac.com P.O. Box 4729 Utica, NY 13504-4729 Subject to change without notice.

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