Super Hot MG series Service Manual
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Super Hot MG series Service Manual

For models mg-50 to mg-150
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See also: Installation and Servicing Manual
INSTALLATION AND SERVICE MANUAL
MG SERIES BOILERS
FOR MODELS MG-50 TO MG-150
SEE REAR COVER FOR INDEX
This manual must only be used by a qualified
heating installer, service technician or gas supplier.
See Section 3.10 for Installer's Checklist
See Section 4.3 for Service Checklist
Manufactured by
Allied Engineering Company
Division of E-Z-Rect Manufacturing Ltd.
Manufacturers of Gas and Electric Boilers, Stainless Steel Tanks, Heat Exchangers and Electric Boosters.
94 Riverside Drive, North Vancouver, B.C. V7H 2M6 • Telephone (604) 929-1214 • FAX (604) 929-5184
Branches: Calgary • Edmonton • Toronto
PN1243384
Price $10

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Summary of Contents for Super Hot MG series

  • Page 1 INSTALLATION AND SERVICE MANUAL MG SERIES BOILERS FOR MODELS MG-50 TO MG-150 SEE REAR COVER FOR INDEX This manual must only be used by a qualified heating installer, service technician or gas supplier. See Section 3.10 for Installer’s Checklist See Section 4.3 for Service Checklist...

  • Page 2: Dimensions And Specifications

    Minimum clearances to combustible material: Top 24” (610 mm), Sides 2” (51 mm), Rear 2” (51 mm), Flue 6" (153 mm) APPROVED FOR COMBUSTIBLE FLOORS & CLOSET INSTALLATION. The Super Hot product improvement program may result in changes to the design and / or specifications being made without notice. SHIPPING...

  • Page 3: Lighting Instructions

    MG Series Boilers – Installation and Service Manual ABOUT OUR MANUALS Your Super Hot boiler has been provided with two manuals: • User's Information Manual - This manual is intended for the owner or user of the boiler and provides information on routine operation and maintenance, and emergency shutdown.

  • Page 4: Gas Valve

    MG Series Boilers – Installation and Service Manual LIGHTING INSTRUCTIONS FOR STANDING PILOT WITH COMBINATION GAS VALVE. This boiler has a pilot which must be lighted 8. Find pilot burner follow by hand. When lighting the pilot, follow these aluminum tube from gas valve.

  • Page 5: Installation Codes And Requirements

    MG Series Boilers – Installation and Service Manual Follow Section 1.5. TO TURN OFF GAS TO THE BOILER OR EMERGENCY SHUT-OFF. WARNING Should boiler overheat, or the gas supply fail to shut off, do not turn off or disconnect the electrical supply to the circulating pump.

  • Page 6: Gas Service Piping

    • Boiler must be installed on a stable and level foundation. • MG Series boilers can be installed on a combustible floor but must not be installed directly on carpeting. • A hot water boiler installed above radiation level must be provided with a low water cutoff device at the time of boiler installation.

  • Page 7: Air Supply For Combustion And Ventilation

    MG Series Boilers – Installation and Service Manual AIR SUPPLY FOR COMBUSTION AND VENTILATION A sufficient air supply MUST be provided to this boiler. Air openings to the boiler room provide the air for combustion, flue gas dilution and ventilation and are always required, regardless whether the air is taken from inside or outside.
  • Page 8 MG Series Boilers – Installation and Service Manual Vent Terminal Information The minimum distance from the termination of a vent terminal to adjacent public walkways, adjacent buildings, openable windows and building openings shall be not less than those values specified in the National Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA Installation Codes.

  • Page 9: Automatic Vent Damper

    MG Series Boilers – Installation and Service Manual AUTOMATIC VENT DAMPER This boiler is supplied with an automatic vent damper. The following instructions must be observed: • The automatic vent damper should be installed at the top of the factory supplied draft hood (Figure 1 - Alternate 3).

  • Page 10: Corrosion Prevention (Internal)

    Do not draw water from the heating system for cleaning, flushing, etc. Super Hot MG series boilers are designed for use in closed loop systems and are not intended for open systems, as in heating pool water or systems where water is constantly replenished. Operating the boiler in an open system will result in premature failure of the heat exchanger.

  • Page 11: Pressure Relief Valve

    MG Series Boilers – Installation and Service Manual 2.13 PRESSURE RELIEF VALVE A pressure relief valve is supplied as standard equipment. The pressure relief valve is extra protection against damage that could be caused by malfunctioning controls or excessive water pressure. If a pressure relief valve is not used, the warranty is void.

  • Page 12: Pre-Start-Up

    MG Series Boilers – Installation and Service Manual Startup Instructions Section 3 PRE-STARTUP a. Fill entire heating system with water and vent or purge air from system. Add water as needed to reach boiler operating pressure. Water should be of suitable quality. Do not use water with high hardness.
  • Page 13 MG Series Boilers – Installation and Service Manual b. Intermittent pilot This boiler does not have a continuous pilot flame. It is equipped with an ignition device which automatically lights the pilot. Do not try to light the pilot by hand.

  • Page 14: Check Burner System

    MG Series Boilers – Installation and Service Manual CHECK BURNER SYSTEM To maintain safe and efficient operation, examine the burner system regularly through the inspection hole near the pilot tube. Check condition of burner system Check ignition and extinction It is possible for parts of the burners system to...

  • Page 15: For Canada

    MG Series Boilers – Installation and Service Manual CHECK INPUT & ORIFICES For safety, the input shown on rating plate must not be exceeded. Check with the table below that the orifice size and input rate shown on your boiler rating plate match your application, i.e. boiler model, fuel type, and altitude.

  • Page 16: Check For Draft Hood Spillage

    MG Series Boilers – Installation and Service Manual Small adjustments to the input rate can be made by varying the manifold pressure. Normally it should be adjusted no more than 0.2 inch w.c. for natural gas or 0.5 inch w.c. for propane from the manifold pressure specified on the rating plate.

  • Page 17: Check For Gas Leaks

    MG Series Boilers – Installation and Service Manual CHECK FOR GAS LEAKS To identify gas leaks, smell for gas around boiler area and gas piping connections (See Section 1.1). To check a specific area for leakage, spray a mixture of soap and water onto the suspected area – active bubbling indicates a gas leak.

  • Page 18: Service & Maintenance Instructions

    MG Series Boilers – Installation and Service Manual Service & Maintenance Instructions Section 4 SERVICE & MAINTENANCE INSTRUCTIONS WARNING Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. WARNING If any part of this boiler has been under water, inspect the boiler and replace any part of the control system and any gas control which has been under water.

  • Page 19: Service Checklist

    MG Series Boilers – Installation and Service Manual SERVICE CHECKLIST Reference Section Do not store anything against the boiler or allow dirt or debris to accumulate in the area immediately surrounding the boiler. The flow of supply and exhaust air must not be obstructed.

  • Page 20: Refractory Handling Procedure

    MG Series Boilers – Installation and Service Manual CAUTION: WATER REPLENISHMENT Avoid unnecessary replenishment of system water. It can allow oxygen to enter the system and cause serious corrosion problems. As well, an excessive amount of minerals may be deposited in the heat exchanger.

  • Page 21: Boiler Water Flow Data

    MG Series Boilers – Installation and Service Manual Boiler Water Flow Data Section 5 Typical Water Flow Versus Pressure Drop Across Boiler 20°F T.D. 30°F T.D. Model Number U.S. GPM P.D. FT. U.S. GPM P.D. FT. MG50 MG75 MG100 MG125 10.0...
  • Page 22 MG Series Boilers – Installation and Service Manual Replacement Parts Section 6 NOTE: To supply the correct part it is important that you state the boiler model number, serial number and type of gas when applicable. Any part returned for replacement under standard company warranties must be properly tagged with Return Goods Authorization Form (R.G.A.), completely filled in with the boiler serial number, model...
  • Page 23 MG Series Boilers – Installation and Service Manual...

  • Page 24: Wiring Diagrams

    MG Series Boilers – Installation and Service Manual Wiring Diagrams Section 7 Simplified Wiring Instructions IMPORTANT • Disconnect power source to boiler before wiring zone control board. • All wiring must comply with applicable codes, ordinances and regulations. • The non-replaceable fuse on the board will be blown if 240 Vac is connected to the board or if the 24 Vac system is even momentarily shorted out.
  • Page 25 MG Series Boilers – Installation and Service Manual...
  • Page 26 MG Series Boilers – Installation and Service Manual...
  • Page 27 MG Series Boilers – Installation and Service Manual...

  • Page 28: Troubleshooting Guide

    MG Series Boilers – Installation and Service Manual Troubleshooting Guide Section 8 Problem Possible Cause Solution • • Boiler will not fire. No power. Check power switches and wiring. • • No gas supply to boiler. Check gas source and pressure.
  • Page 29 MG Series Boilers – Installation and Service Manual Problem Possible Cause Solution • • Pilot flame will not light on High voltage wiring is loose, broken or No spark. electronic ignition. grounded. Repair wiring. • • Ignition electrodes are damaged.
  • Page 30 MG Series Boilers – Installation and Service Manual NOTES Section 9...
  • Page 31 MG Series Boilers – Installation and Service Manual NOTES Section 9...
  • Page 32 MG Series Boilers – Installation and Service Manual NDEX Section 10 Section Page Dimensions and Specifications – MG Series Boilers..................2 About Our Manuals ............................3 Lighting Instructions......................... 3 Safety Instructions..........................3 Lighting Instructions ..........................3 Lighting Instructions for Standing Pilot with Combination Gas Valve ..........4 Lighting Instructions for Intermittent Electronic &...

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