Wood master MAXIM M255 PE User manual

OWNER’S MANUAL
SAVE THESE
INSTRUCTIONS
(p/n 9001006 - REV. A)
WARNING: If the information in this manual is not followed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
– Do not store or use gasoline or other ammable 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 re department.
– Installation and service must be performed by a qualied installer, service agency or the gas supplier.
0117PS024S
0117PS024E
M255 PE
WOOD PELLET FURNACE

WoodMaster, Inc. • 20502 160th Street • Greenbush, MN 56726
WoodMaster.com
For parts and accessories, service or repairs, call your authorized WoodMaster dealer or heating contractor. Record
the information below for future reference.
Model Serial Number Installation Date
Dealership Name Phone Number
Owner Name
e Maxim Wood Pellet Furnace is listed by OMNI-Test Laboratories to the applicable portions of the following standards: UL 2523-
2018 Solid Fuel-Fired Hydronic Heating Appliances, Water Heaters and Boilers, CAN/CSA B415.1-10 (R2015) Performance Testing
of Solid-Fuel-Burning Heating Appliances, CSA-B366.1-11 (R2015) Solid-Fuel-Fired Central Heating Appliance, ASTM E2618-
13 Standard Test Method for Measurement of Particulate Emissions and Heating Eciency of Solid Fuel-Fired Hydronic Heating
Appliances, ASTM E2515-11 Standard Test Method for Determination of Particulate Matter Emissions Collected by a Dilution
Tunnel.
e Maxim Wood Pellet Furnace includes two 4-foot stainless steel insulated chimney sections. Use only stainless steel solid fuel
chimneys specied by WoodMaster. Maximum draft is marked on nameplate.
French Owner's Manual is available at support.woodmaster.com or upon request from your dealer
(Manuel d'installation en français disponible sur demande auprès de votre revendeur)
MAXIM M255 PE Annual Eciency Rating*: 96.2% (lower heating value), 89.22% (higher heating value)
Manufacturer's Rated Heat Output Capacity: 190,000 Btu/hr
ermal Output Rating: 182,504 Btu/hr (53.5 kW) - maximum
Water Capacity: 90 gal. | Weight: 1,297 lbs
*Performance is a product of the combustion rate, combustion eciency and heat exchange eciency with a single fuel load without refueling. Results
vary based on wood species, wood quality, wood quantity and moisture content. Eciencies are determined under the same test conditions using
higher heating value, lower heating value and annual fuel utilization eciency (AFUE).
• is heater meets the 2020 U.S. Environmental Protection Agency's cord wood emission limits for wood heaters sold after May 15, 2020.
Under specic test conditions this heater has been shown to deliver heat at rates ranging from 0 to 182,504 Btu/hr.
• is wood heater has a manufacturer-set minimum low burn rate that must not be altered. is wood heater needs periodic inspection and
repair for proper operation. It is against federal regulations to operate this wood heater in a manner inconsistent with operating instructions in
this manual.
• DO NOT OVERFIRE THIS HEATER. Attempts to achieve heat output rates that exceed heater design specications can result in permanent
damage to the heater.
• Any person(s) operating a hydronic heater must comply with all applicable laws, including but not limited to local ordinances.
• Improper use or failure to maintain the hydronic heater may cause nuisance conditions. e person(s) operating a hydronic heater is/
are responsible for operation in a manner that does not create a nuisance condition. Meeting the setback distance and stack height
recommendations from the manufacturer and requirements in applicable State and local regulations may not always be adequate to prevent
nuisance conditions in some areas due to terrain or other factors.
• Operating an outdoor furnace may not be suitable to some individuals' abilities or lifestyles. Be sure to review the Owner's Manual for the
appliance with your dealer.
- Register at time of purchase for FREE 5 Year Limited Warranty -
Verify your warranty at: WoodMaster.com/w25

Contents
How to Use This Guide
e guide is divided into sections
to help with the operation and
maintenance of the outdoor furnace.
If questions arise that are not
answered with this manual, consult
with your authorized WoodMaster
dealer.
WoodMaster Online Resources ................................................................. Iv
EPA Resources ............................................................................... Iv
Labeling and Terminology ......................................................................1
Important Precautionary Information ................................................. 2
Removing from Pallet..........................................................................4
Shipping Slot Covers ...........................................................................4
Selecting a Location ...........................................................................5
Foundation...................................................................................5
Levelling the Outdoor Furnace ..................................................................6
Clearances ...................................................................................6
Electrical - Grounding Rod ......................................................................7
Access to Ports on Outdoor Furnace ..............................................................8
Furnace Installation - Connecting toYour Existing System ...........................................9
Outdoor Furnace Best Burn Practices ............................................................11
Chimney Recommendations ...................................................................11
Assembling Chimney Transition Box and Insert / Chimney Installation................................11
Maxim Chimney Transition Box and Insert........................................................12
Chimney Draft ...............................................................................12
Water Quality and Maintenance ..................................................... 14
Test Supply Water ............................................................................14
Add Initial Water Treatment....................................................................14
Fill withWater and Purge Air...................................................................15
Immediately Start the Pump(s) and Heat the SystemWater to 185˚F (85˚C)...........................17
Test the Treated System Water..................................................................18
System Maintenance .........................................................................19
Water Test Kits and Test Results.................................................................19
Flushing the System ..........................................................................21
Adding Antifreeze to Outdoor Furnace System ....................................................22
Fuel Selection ..................................................................... 23
Fuel Quality and Storage ......................................................................23
Other Important Information About Fuels........................................................23
Operating Instructions ............................................................. 24
Filling the Hopper ............................................................................24
Power Up ...................................................................................24
Basic Operation ..............................................................................24
Lighting Instructions .........................................................................24
Auger Prime.................................................................................24
Relighting after a Fire Out .....................................................................25
Operating Precautions ........................................................................26
Smoke in Hopper.............................................................................27
Routine Maintenance .............................................................. 28
Maintenance Sections .............................................................. 28
Section 1 - Water Level ........................................................................28
Section 2 - Ash Removal.......................................................................28
Section 3 - Firebox............................................................................30
Section 4 - Gaskets ...........................................................................30
Section 5 - Heat Exchangers and ChimneyTransition...............................................31
Section 6 - Aerator and Burn Chamber...........................................................32
Section 7 - Door and Hopper ...................................................................34
Section 8 - Check Fuel Door Operation ...........................................................34
Section 9 - Thermal Valve......................................................................35
Section 10 - Test Thermal Valve .................................................................39
Troubleshooting................................................................... 40
General Information ............................................................... 46
Wiring Diagram ................................................................... 47

MAXIM OUTDOORWOOD PELLET FURNACE • OWNER'S MANUAL
INSTALLATIONS IN MASSACHUSETTS:
1. All installation components must be products approved in the Commonwealth of Massachusetts by the Gas and Plumbing Board.
2. e maximum run of tubing from the water heater to a fan coil is 50 linear feet.
3. Persons operating this hydronic heater are responsible for operation of the hydronic heater so as not to cause a condition of air pollution as
dened in 310 CMR 7.01(1).
EPA RESOURCES
EPA's Burnwise Program - https://www.epa.gov/burnwise
NOTE: The warranty can be voided by operating a residential hydronic heater in a manner inconsistent with the Owner's Manual.
WOODMASTER ONLINE RESOURCES
Enter WoodMaster.com in your browser or scan the code using any QR code reader app on your smartphone to access
WoodMaster's library of information to help with installation, operation and maintenance of your WoodMaster outdoor furnace.
Detailed Furnace Installation Variations - https://www.woodmaster.com/furnace-installation/
View and/or download PDFs to assist in installation of your outdoor furnace. Information and examples
regarding pumps, foundations, chimneys and support structures, ermoPEX piping, and example
congurations for a variety of heating congurations.
Online Support Center
https://support.woodmaster.com
Enter your furnace serial number and nd
articles, answers, parts and more information.
Videos to supplement the Owner's Manual are available at
www.youtube.com/@WMfurnaces
Watch tips on initial startup, testing system water and more.
support.WoodMaster.com
Online Support Center
Write your serial number here for future reference.

1
MAXIM OUTDOORWOOD PELLET FURNACE • OWNER'S MANUAL
Labeling and Terminology
e outdoor furnace and this guide use the following terms and symbols to
bring attention to the presence of hazards of various risk levels and important
information concerning the use and maintenance of the outdoor furnace.
This symbol and text indicate an imminently hazardous situation which, if ignored,
will result in death or serious injury.
This symbol and text indicate the presence of a hazard which can cause severe personal
injury or death to an operator or bystander, or substantial property damage if ignored.
CAUTION
This symbol and text indicate the presence of a hazard which can cause minor personal
injury or property damage if ignored.
NOTE: Indicates supplementary information worthy of particular attention relating
to installation, operation, or maintenance of the outdoor furnace but is not related to a
hazardous condition.
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
A B C D E F G
117.5**34
86
in.
cm
57 49.5 36 48 59.5*
298.5**145 126 91.5 122
H
14.5
37151*
STAR
byCentral Bo iler
FIRE
WaterTemp
CleanOut
Mode
Hold
toLight
Press
Twice
forAuto
Relight
Holdto
Prime
Press
Twice
toClean
Power
TM
Ignition
AutoRelight
Enabled
p/n
Auger
AirAdjust
5%100% 60%
HeatOutput
20%65% 1%
HIGH MEDIUM LOW
D
A
B
E
C
G
F
Measurement (G) with two 4-foot chimney sections.
Measurement (F) is from firebox door to chimney
inspection cover.
*
**
H