Central Boiler MAXIM M255 PE Owner's Manual
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Central Boiler MAXIM M255 PE Owner's Manual

Central Boiler MAXIM M255 PE Owner's Manual

Wood pellet furnace
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WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
– Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
– WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch.
• Immediately call your gas supplier. Follow the supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
– Installation and service must be performed by a qualified installer, service agency or the gas supplier.
0117PS024S
0117PS024E
WOOD PELLET FURNACE
OWNER'S MANUAL
M255 PE
INSTRUCTIONS
SAVE THESE
(p/n 9001003 - REV. A)

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  • Page 1 WOOD PELLET FURNACE OWNER’S MANUAL M255 PE WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. – Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. –...
  • Page 2 - Register at time of purchase for FREE 5 Year Limited Warranty - CentralBoiler.com/w25 Verify your warranty at: For parts and accessories, service or repairs, call your authorized Central Boiler dealer or heating contractor. Record the information below for future reference. Model...

  • Page 3: Table Of Contents

    Central Boiler Online Resources . . . . . . . . . . . . . . . . . . .

  • Page 4: Central Boiler Online Resources

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL CENTRAL BOILER ONLINE RESOURCES Enter CentralBoiler.com in your browser or scan the code using any QR code reader app on your smartphone to access Central Boiler's library of information to help with installation, operation and maintenance of your Central Boiler outdoor furnace.

  • Page 5: Labeling And Terminology

    Be sure to follow all instructions and related precautions as they are meant for your safety and protection. Store this manual in a readily accessible location for future reference. Maxim M255 PE Measurements 57 49.5 59.5* 117.5** 14.5 145 126 91.5 122...

  • Page 6: Important Precautionary Information

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Important Precautionary Information Be sure to read carefully and understand these precautions before, during and after the installation, operation and maintenance of the furnace. NOTE: All operations must be in accordance with local and state CAUTION codes which may differ from the information in this manual.
  • Page 7 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL This heater is designed to burn premium quality wood pellets Allow the outdoor furnace to thoroughly cool and completely only.* Higher efficiencies and lower emissions generally result clean out the firebox before draining water from the outdoor when burning premium quality wood pellets, as compared to furnace.

  • Page 8: Removing From Pallet

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Removing from Pallet Options for Increasing Fuel Storage An optional 48-Bushel Hopper is The outdoor furnace is secured to the shipping pallet with four brackets. To available (p/n 9660 or 9760) for remove these brackets, loosen (but do not remove) the two screws securing increasing fuel storage.

  • Page 9: Selecting A Location

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Foundation Selecting a Location The outdoor furnace may be installed directly on stable, level ground without To ensure the Maxim Furnace the necessity of a foundation. If the ground is unstable, one option is to use functions as designed, careful patio blocks, bricks or pavers under the base.

  • Page 10: Levelling The Outdoor Furnace

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Levelling the Outdoor Furnace Maxim Leveling Procedure CAUTION The back of the furnace must not be lower than the front of the furnace. Small Gap (No less Place Decal than 1/16") Here The Maxim should be leveled so that the back of the transition box (i.e., the Centered burner auger motor end) is slightly higher than the front.

  • Page 11: Electrical - Grounding Rod

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Electrical - Grounding Rod NOTE: Any electrical installation should be done by a qualified installer in accordance with applicable codes. Side View of Pump Access Area The outdoor furnace must be electrically bonded to ground in accordance with NOTE: Incoming the requirements of the authority having jurisdiction or, in absence of such power, Handy box,...

  • Page 12: Access To Ports On Outdoor Furnace

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Access to Ports on Outdoor Furnace Access to the hot supply and return ports is gained by removing the access panels on the lower right-hand side and back of the furnace. There are two hot supply and two return ports on the furnace.

  • Page 13: Furnace Installation - Connecting To Your Existing System

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Furnace Installation - Connecting to Your Existing System A common installation is to connect the outdoor furnace to an existing water Detailed Furnace Installation Variations heater and then to an existing forced air system. A water-to-air heat exchanger Visit CentralBoiler.com to access is mounted in the plenum or duct work of the existing furnace.
  • Page 14 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Remote Thermal Storage Installation Connecting to Remote Thermal Storage Tank NOTE Installer must comply with all For illustration purposes only; applicable codes and regulations. system components may vary. To Heating System Remote Thermal Storage Tank...

  • Page 15: Outdoor Furnace Best Burn Practices

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Chimney Recommendations Outdoor Furnace Best Burn Practices In higher populated areas, extend the chimney to a height above the roofs of surrounding buildings. Use Central Boiler Chimney Extensions when 1. Read and follow all operating extending the chimney.

  • Page 16: Maxim Chimney Transition Box And Insert

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Maxim Chimney Transition Box and Insert Chimney Draft Proper draft is necessary for the Maxim to operate 3. If a spark arrestor is being used, make sure it is clean optimally. Draft occurs when the temperature in the and unobstructed.
  • Page 17 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL If extensions are added to the standard eight feet (2.4 m) of chimney, the chimney should be reinforced appropriately. The illustration shows chimney support recommendations when three or more sections are used. When adding sections of chimney, make sure that there is nothing within the fall zone of the chimney that could be damaged.

  • Page 18: Water Quality And Maintenance

    8.0 and 9.5. One unit of MolyArmor 350 is a 1-gallon (3.78-liter) container. MOLYARMOR 350 TREATMENT AMOUNTS Maxim M255 PE 1/2 gallons Add the recommended amount of MolyArmor 350 to the outdoor furnace. NOTE: If the system has a larger than normal water capacity, more MolyArmor 350 should be added at a recommended rate of 6.5 oz.

  • Page 19: Fill With Water And Purge Air

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Fill with Water and Purge Air NOTE: The items referred to in this procedure correspond to the items in the illustration below. All air must be purged from the water lines when filling the system. Also, the circulation pump(s) must be installed in the hot supply line(s).
  • Page 20 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Close valve #4 and valve #5. Open valve #1 and valve #2. This step begins filling the system with domestic water and purging the hot supply line and thermostatic valve. Remove cap from valve #3 and open valve #3 slightly to purge air from valve body.

  • Page 21: Immediately Start The Pump(S) And Heat The System Water To 185˚F (85˚C)

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Immediately Start the Pump(s) and Heat the System Water to 185˚F (85˚C) CAUTION Be sure the outdoor furnace is filled with water before firing. Water level is safe when the water level indicator rod is above the vent cap. MolyArmor 350 must be added before the initial fill.

  • Page 22: Test The Treated System Water

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Test the Treated System Water After circulating the water in the system for at least 24 hours, test the treated system water for the recommended moly (at least 350 ppm) and pH level (between 8.0 and 9.5).

  • Page 23: System Maintenance

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Draining Treated System Water Dip a test strip from the test kit in the water sample for 1 second and remove. Shake off excess liquid (very important to prevent water bleed MolyArmor 350 is composed of common from one pad to the other).
  • Page 24 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Biological contamination can occur if the furnace is not heated up to 185˚F immediately after filling it with inhibitor and water as directed. NOTE: ANY time water is added to the system, it is extremely important to bring the water temperature up to operating temperature (185˚F) as soon as possible, even if it is during the off-season.

  • Page 25: Flushing The System

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Flushing the System If the system water is brown or orange, it is an indication that the corrosion inhibitor level has not been maintained correctly and corrosion is present in the water jacket. Sludge Conditioner (p/n 166) can be used by circulating the recommended amount through the furnace for one week to help clean some of the corrosion from inside the water jacket before flushing, draining and refilling with water and the correct amount of MolyArmor 350.

  • Page 26: Adding Antifreeze To Outdoor Furnace System

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Adding Antifreeze to Outdoor Furnace System If using other antifreeze, use ONLY uninhibited, undyed, “raw” propylene glycol industrial grade with softened water and add the correct amount of MolyArmor 350 to achieve 350 ppm moly and 8.0 to 9.5 pH levels. Some distributors call this type of antifreeze PGI (shorthand for Propylene Glycol Industrial grade).

  • Page 27: Fuel Selection

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Fuel Selection Before You Start Operating Your Use only premium quality wood pellets. Maxim Outdoor Pellet Furnace Feed rates and safe operation are not warranted with alternative fuels. Be sure to read carefully and observe all of the information in the entire CAUTION Owner's Manual.

  • Page 28: Operating Instructions

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Operating Instructions Filling the Hopper Open the hopper lid and add fuel. After filling, make sure the hopper lid is securely closed to prevent moisture from entering the hopper. Do not over-fill the hopper.

  • Page 29: Relighting After A Fire Out

    If this condition exists, inspect the burner auger and clean or replace as necessary. If condition persists contact your Central Boiler dealer for more information. Fuel Door Blocked...

  • Page 30: Operating Precautions

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Operating Precautions NOTE: If the controller is flashing the system senses a low water condition. This outdoor furnace is equipped with an automatic shut down system if the water level falls to an unsafe level. The water level in the outdoor furnace is safe when the water level indicator rod is above the vent cap.

  • Page 31: Smoke In Hopper

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Smoke in Hopper How air flows through the furnace is an important part of optimal operation. Smoke in the hopper is an indication that the air flow through the furnace is restricted, obstructed or different than it should be. CAUTION Operating for extended periods of time with air flow through the furnace restricted (i.e., smoke in the hopper) can damage components in the furnace.

  • Page 32: Routine Maintenance

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Routine Maintenance CAUTION Use only genuine Central Boiler Parts and Accessories if it ever becomes necessary to replace any component of the outdoor furnace. Routine inspections and maintenance are essential to the proper operation and longevity of the outdoor furnace.
  • Page 33 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL CAUTION When cleaning the outdoor furnace, be careful not to spill any hot ash outside of the noncombustible container. Do not allow ash in the burn chamber to accumulate over the aerator as shown.

  • Page 34: Section 3 - Firebox

    Using the figure as a reference, inspect the hopper lid gasket and replace if necessary. NOTE: Replacement gaskets for the furnace door, chimney transition cover and hopper are available from authorized Central Boiler dealers.

  • Page 35: Section 5 - Heat Exchangers And Chimney Transition

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Hopper Gasket Section 5 - Heat Exchangers and Chimney Transition The heat exchangers should be cleaned every time ash is removed, or if air flow through the heat exchangers becomes restricted. To inspect the heat exchangers, remove the chimney transition cover on the back of the furnace and open the firebox door.

  • Page 36: Section 6 - Aerator And Burn Chamber

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Remove deposits by scraping with the cleaning rod provided with your outdoor furnace. Use the cleaning rod from both the front and the back of the furnace, working from top to bottom of each passageway in the heat exchanger. Clean heat exchangers from the front AND the back using the cleaning rod.
  • Page 37 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Maxim M255 PE models Ignitor Aerator Burn Chamber CAUTION Before performing any maintenance on the burn chamber or aerator, shut off the burner, allow the outdoor furnace to cool and clean the firebox.

  • Page 38: Section 7 - Door And Hopper

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Inspecting and Cleaning Inspect the aerator and burn chamber for any build-up of mineral deposits, especially in and around the combustion air holes. To clean combustion air holes, use a suitably sized drill bit, round wire brush or other suitable tool to remove any deposits.

  • Page 39: Section 9 - Thermal Valve

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Section 9 - Thermal Valve The thermal valve does not require electricity to operate. If during a power outage, a high temperature condition is detected in the burner auger area, the thermal valve is designed to release a small amount of water into the burner auger area to cool the area.
  • Page 40 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL IF THE THERMAL VALVE ACTIVATES If the thermal valve activates, it will be necessary to clean out the areas in which water from the thermal valve may have come in contact with the wood pellets. Do not use the furnace until these areas have been thoroughly cleaned.
  • Page 41 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Remove the key from the keyway slot on the auger shaft and set aside for assembly. Using a wooden block, tap the burner auger into the firebox. Do not hit the bushing. Remove the burner auger from inside the firebox.
  • Page 42 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Install Transfer Auger Install the transfer auger assembly in the transfer auger housing. Make sure the end of the transfer auger tube fits over the brass guide in the transfer auger housing. Verify by visually checking from the top of the hopper.

  • Page 43: Section 10 - Test Thermal Valve

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Section 10 - Test Thermal Valve Twice each heating season (at the beginning and the end), check to make sure the thermal valve operates properly. Allow the outdoor furnace to thoroughly cool down before performing maintenance. Disconnect the electrical power at the main power source.

  • Page 44: Troubleshooting

    If the fuel appears to have expanded from absorbing water, the thermal valve has opened. Contact your Central Boiler dealer for assistance. Circulation valve(s) closed - Be sure all valves in the system are open.
  • Page 45 16. Poor water quality - Water with high amounts of solids, sand or dirt can create deposits inside the wall of heat exchanger components, reducing the amount of heat output. If this condition is suspected, contact your Central Boiler dealer. B. FURNACE IS OVERHEATING (FIRESTAR LED DISPLAYS...
  • Page 46 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL E. BURNING AN EXCESSIVE AMOUNT OF FUEL. High volume water heating - High volume water heating (e.g., car wash, swimming pool, etc.) will require high fuel consumption. Excessive heat loss - See items 8-12 of Furnace Does Not Heat. Supply and return line heat loss - If not using ThermoPEX, supply and return lines buried in a wet, low-lying area may cause a large heat loss that will greatly increase the fuel consumption.
  • Page 47 If you are unsure how to proceed, contact your Central Boiler dealer. Water temperature is too low - If the heat load in the system is too large, the water in the system will not reach high enough temperatures and corrosion can occur.
  • Page 48 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL Inspect the firebox and under and around the outside of the outdoor furnace for evidence of a leak each time the water level is checked. During the 48-hour inspection period, the water lines should also be checked for leaks using a pressure gauge and the following procedure: Isolate the furnace by closing all shut-off valves on the hot supply and return lines at the furnace.
  • Page 49 MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL L. SMOKE IN THE HOPPER Outdoor furnace not level - The furnace should be leveled so that the back of the transition box (i.e., the burner auger motor end) is slightly higher than the front.

  • Page 50: General Information

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL GENERAL INFORMATION Make note of these precautionary statements, also found on the outdoor furnace. NOTICE ANY TIME WATER IS ADDED, Fuel door must operate properly. the furnace MUST BE immediately heated to 185°F, It is important to check the fuel circulated, and the inhibitor level tested.

  • Page 51: Wiring Diagram

    MAXIM OUTDOOR WOOD PELLET FURNACE • OWNER'S MANUAL WIRING DIAGRAM Maxim M255 PE Main Harness Control Connector Pin Order Panel Assembly Electric Ignition VIO/ Wiring Diagram 16GA 16GA 16GA 16GA Main 16GA E-Link 18GA 18GA Harness RED/ Screw-on Connector E-Link...
  • Page 52 If a defect exists, at its option Central Boiler will (1) repair the defective part at no charge, using new or refurbished replacement parts, (2) exchange the furnace with a comparable model furnace that is new or which has been manufactured from new or serviceable used parts and is at least functionally equivalent to the original furnace, or (3) refund the purchase price of the furnace based on the pro-ration scale.

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