Heatmor 400-4S User manual

Outdoor Furnaces
TM
SAVE THESE INSTRUCTIONS

ii
When these safety symbols appear on the following pages, they will
alert you to the possibility of serious injury if you do not comply with the
corresponding instructions. The hazard may originate from something
mechanical or electrical shock. Please read the instructions carefully.
When you see this safety symbol on the following pages, it will alert you
to the possibility of damage to your HEATMORTM Stainless Steel Outdoor
Furnace if you do not comply with the corresponding instructions. Please
read the instructions carefully.
The HEATMORTM Stainless Steel Outdoor Furnace is certied to offer safe
service provided it is installed, operated and maintained in accordance with
the instructions contained in this manual.
Proper personal protective equipment, (PPE), MUST BE WORN AT ALL
TIMES when servicing, loading and maintaining any of the HEATMORTM
Stainless Steel Outdoor Furnace product line.

iii
TABLE OF CONTENTS Page #
I DEAR HEATMOR™ OWNER 1
II NOTICE TO THE READER 2
III CERTIFICATE OF COMPLIANCE 3,4
1 HEATMOR™ STAINLESS STEEL FURNACE MODEL 400-4S 5
2 FURNACE SPECIFICATIONS 6
3 FRONT CUT AWAY VIEW OF HEATMOR™ OUTDOOR FURNACE 7
FURNACE PARTS LIST 8
4 REAR CUT AWAY VIEW OF HEATMOR™ OUTDOOR FURNACE 9
FURNACE PARTS LIST 10
5 MINIMUM CLEARANCE SEPARATION SPECIFICATIONS 11
6 WARNINGS AND PRECAUTIONS 12
A Installation 12
B Electrical 13
C Other 13
7 CONCRETE PAD SPECIFICATIONS 14
8 INSTALLATION OF THE HEATMOR™ FURNACE 15
A Equipment Required 15
B Placing the HEATMOR™ on the Concrete Pad 15
C Caulking Around the Outside Perimeter of HEATMOR™ 15
D Filling the HEATMOR™ Outdoor Furnace Initially with Water 16
E Maintaining Water in the Bladder and in the HEATMOR™ 17
9 SAFE OPERATING GUIDELINES 18
A Operation 18
B Lighting Your HEATMOR™ for the First Time 20
C Dew Point 21
D Loading Wood into the HEATMOR™ 22
E What can I burn? 23
i. Wood 23
F How does a fire burn out? 23
G Types of Wood 24
H Wood as a Fuel 24
I Stages of Combustion 24
J Efficiency Measurements and Types of Fires 25
K Loading of the Furnace 25
L Handling and Storage of Wood 26
10 WATER 27
A Qualities of Water to Use 27
B Water Level Maintenance 27
C Removal of water and replacement of water 27
D Water Additives 28
E Water Treatment Additives and Safety Specifications 29

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F Adding Water Treatment and Freeze Protection Products 30
11 BLADDER ASSEMBLY 31
A Bladder 31
B Removal and Replacement of the Bladder 31
C Bladder Gate Valve and Bladder Hose 32-33
12 WATER JACKET 34
A Water Jacket 34
B Supply Line and Return Line Connectors 34
C Relief Vent Pipe and Weighted Pop off Ball 34
13 FIREBOX AND OTHER COMPONENTS 35
A Firebox 35
B Secondary Air Wing 35
C Firebox and Flue Thermocouples 36
D Firebox Door 37-38
E Firebox Door Hoses and Elbows 39
F Firebox Door Handle 40
G Firebox Door Hinge 41
H Firebox Door Latch 41
I Firebox Door Magnet 41
J Firebox Door Gasket and Insulation 41-42
K Firebox Door Frame 43
L Ceramic 43
M Standard Grates and Insulation 44
N Grate Plate 45
O Flash Curtain / Heat Shield 46
14 AIR SUPPLY 47
A Combustion Air Blower, Solenoid and Flipper 47
i. Operation of the Combustion Air Blower 47
ii. Steps to Maintain your Blower 47
B Primary/Secondary Air Motor 48
C Air Box(s) 49
D Automatic Fan Switch (A.F.S.) 49
15 CHIMNEY AND TOP FLUE 50
A Chimney 50
B Chimney Extension(s) 50
C Rain Caps and Spark Arrestor 51
D Flue 51
E Flue Covers 51
F Flue Scraper 51
16 ASHES 52
A Ash Management and Ash Removal 52
B Ash Pan 53
C Ash Scraper 53
D Ash Cleanout Tube 53
E Ash Cleanout Tube Cover Plate 54

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17 THERMOMETER (TEMPERATURE GAUGE) 55
18 ELECTRICAL 56
A Electrical Supply 56
B Electrical Supply Junction Box 56
C Double Electrical Outlets at rear 57
D Water Temperature Probe 57
E High Water Temperature Safety Shutoff Controller 57
F Front Light and Fan Power Switch 58
G In The Event of a Power Failure 59
19 ELECTRONICS 60
A Controller 60
20 EXTERIOR CLADDING AND INSULATION 61
A Outer Door of HEATMOR™ 61
B Roof of the HEATMOR™ 61
C Sides of the HEATMOR™ 62
D Insulation 62
21 AIR LEAKS 63
A Checking For Air Leaks 63
B Why do we not want any air leaks? 63
22 WATER LEAKS 64
23 DOMESTIC COIL 65
24 SEASON START UP & SHUT DOWN CHECKLISTS 66-67
25 FREQUENTLY ASKED QUESTIONS 69-70
26 TROUBLESHOOTING AND SOLUTIONS 71-83
HEATMOR™ STAINLESS STEEL LIMITED WARRANTY 84-85
NEW FURNACE DELIVERY CHECK LIST 86
HEATMOR™ FOR LIFE 87
NOTES 88
WIRING DIAGRAM 89-90

1
Dear HEATMOR™Owner,
On behalf of myself and the employees of HEATMOR™, I would like to take this opportunity to personally
thank you for the purchase of our HEATMOR™ Stainless Steel Outdoor Furnace. You can be assured that
your HEATMOR™ was constructed with great emphasis on quality and workmanship. It is our commitment to
provide you with the finest outdoor furnace in the industry. We wish you many years of trouble-free use and we
sincerely hope you enjoy the comforts of burning wood.
This manual contains the manufacturer’s recommendations for operation and maintenance of the HEATMOR™
Stainless Steel Outdoor Furnace. Also included are some regular maintenance tips and FAQ’s (frequently
asked questions). Please observe and follow all safety instructions as directed in this manual. SAVE THESE
INSTRUCTIONS FOR FUTURE REFERENCE.
Finally, please fill out your registration and warranty forms, if you haven’t done so already. If you have any
further questions on the operation or maintenance of your HEATMOR™ Outdoor Furnace, please contact your
local dealer.
Sincerely,
Gerry Reed,
President

2
NOTICE TO THE READER
HEATMOR™ Inc. warrants and guarantees ALL HEATMOR™ Stainless Steel Outdoor Furnace Models.
HEATMOR™ Inc. does not warrant or guarantee any of the supporting products described within this
Operations and Maintenance Manual.
The contents, descriptions, directions, diagrams, and recommendations within this material are for the sole
purpose of suggested operation and maintenance methods.
Furthermore, HEATMOR™ Inc. shall not be liable for any special, consequential, or exemplary damages,
resulting, in whole or part, from the readers’ neglectful use, based upon the material within this Operations and
Maintenance Manual. Adhere to and follow all maintenance procedures set forth in this manual.
The methods of operation described within this Operations and Maintenance Manual have proven to be
effective for HEATMOR™ Inc. for the sole purpose of the operation of a HEATMOR™ Stainless Steel Outdoor
Furnace.
All formulas and gures listed within this Operations and Maintenance Manual are approximated and should be
read as such.
For additional copies or information, contact
HEATMOR™ Inc.
105 Industrial Park Court NE,
P.O. Box 787,
Warroad, MN 56763 USA
Phone: [phone]
Fax: [phone]
Website: www.heatmor.com
E-mail: [e-mail]
Copyright © 2012 - HEATMOR™ INC.
All rights reserved. No part of this Operations and Maintenance Manual may be reproduced or used in any
form or by any means - graphic, electronic or mechanical, including photocopying, recording, taping, or
information storage and retrieval systems - without the written permission of HEATMOR™ Inc.
MODEL 400-4S

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Units are Safety Listed by Omni Test Laboratories
Report # 275-O-09-2
Listed to UL2523-2009 and CSA B366.1-11

4
Units are Safety Listed by Omni Test Laboratories
Report # 275-O-09-2
Listed to UL2523-2009 and CSA B366.1-11

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HEATMOR™ STAINLESS STEEL OUTDOOR FURNACE MODEL 400-4S
CHAPTER 1

6
FURNACE SPECIFICATIONS
Specications Model 400-4S
Overall Width (Inches)
Base Width (Inches) (Footprint)
56
53
Overall Height (Inches)
(With chimney stub) 97
Overall Length (Inches)
Base Length (Inches) (Footprint)
95
85
Total Weight (lbs., without water) 2506
Water Capacity (U.S. gallons) 488
Forced Draft (C.F.M.) Variable 226
Chimney Size (Inches) 10”
Wood Length (Inches) 41”
Insulated Heating Area (Sq. Ft.)*
1 Loading/day
2 Loading/day
5000
10,000
Firebox Width (Inches) 23
Firebox Length (Inches) 41
Firebox Height (Inches) 41
Volume of Firebox (Cu. Ft.) 22
Firebox Door Size (Inches) (W x H) 18 x 26
Flue Transfer Area (Sq. Ft.) 56
BTU’s (maximum)** 400,000
Water Jacket Steel
Gauge
409 Stainless
10
Firebox Steel
Gauge
409 Stainless
10
Integrated Base Steel
Gauge
409 Stainless
10
Base of Unit to
Bottom of Loading Door (Inches) 25
Warranty - Workmanship Limited Lifetime
Warranty - Corrosion Limited Lifetime
Approvals Test Standards EPA Phase 2
Safety Standards UL 2523-2009
CSA-B366.1-11
Hook-ups Back
Type of Fuel Wood Only
Electrical Supply 115 V, 60HZ, 1 Phase
CHAPTER 2
* This is an estimate only. Actual loadings per day may vary depending on structures heated and type of wood used.
** This value should only be used as an indication of the furnace’s heat recovery ability. Sustained outputs at this rate will increase the
loadings per day. Some types of wood may prevent the furnace from reaching this maximum output.

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CHAPTER 3
FRONT CUT-AWAY VIEW OF HEATMOR™ OUTDOOR FURNACE
(For parts not shown on the cut-away view, please refer to the appropriate chapter for further details.)

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FURNACE PARTS LIST
Firebox
1) Firebox
2) Firebox door
3) Firebox door hoses and elbows
4) Firebox door handle
5) Firebox door hinge
6) Firebox door latch
7) Firebox door handle holder(not shown)
8) Firebox door gasket
9) Firebox door frame
10) Ceramic
11) Standard grates
12) Flash curtain / heat shield(not shown)
Water jacket
13) Water jacket (surrounds rebox)
14) Supply line threaded connector(not shown)
15) Return line threaded connector(not shown)
16) Relief vent pipe
17) Weighted pop off valve
Air supply
18) Combustion air blower(not shown)
19) Flipper assembly(not shown)
20) Air box
21) Automatic Fan Switch (A.F.S.)
49) Secondary Air Wing
Chimney and top flue
22) Chimney Stub
23) Chimney extension(s)(not shown)
24) Rectangular ue
25) Front ue cover plate
26) Rear ue cover plates(not shown)
27) Flue scraper(not shown)
Ashes
28) Ash pan
29) Ash scraper(not shown)
30) Ash pan cover plate
Bladder assembly
31) Bladder
32) Bladder gate valve and hose
33) Water level gauge(not shown)
Thermocouples
34) Fire door thermocouple
35) Firebox thermocouple #1, #2, #3
36) Water thermocouple
Electrical
37) Electrical supply junction box(not shown)
38) Electrical plug outlets(not shown)
39) Water temperature high-limit
controller (aquastat) (not shown)
40) Front light and combustion air
blower control switch(not shown)
Housing
41) Outer front door
42) Outer rear door(not shown)
43) Roof
44) Sides(not shown)
45) Insulation(not shown)
Optional hot water internal coil
46) Internal coil(not shown)
Lift hook
47) Lift ring
48) Box of Chemical, Keys, Manual(not shown)

9
CHAPTER 4
REAR CUT-AWAY VIEW OF HEATMOR™ OUTDOOR FURNACE
(For parts not shown on the cut-away view, please refer to the appropriate chapter for further details.)

10
FURNACE PARTS LIST
Firebox
1) Firebox
2) Firebox door
3) Firebox door hoses and elbows
4) Firebox door handle
5) Firebox door hinge
6) Firebox door latch
7) Firebox door handle holder(not shown)
8) Firebox door gasket
9) Firebox door frame
10) Ceramic
11) Standard grates
12) Flash curtain / heat shield(not shown)
Water jacket
13) Water jacket (surrounds rebox)
14) Supply line threaded connector
15) Return line threaded connector(not shown)
16) Relief vent pipe
17) Weighted pop off valve
Air supply
18) Combustion air blower
19) Flipper assembly(not shown)
20) Air box
21) Automatic Fan Switch (A.F.S.)
49) Secondary Air Wing
Chimney and top flue
22) Chimney Stub
23) Chimney extension(s)(not shown)
24) Rectangular ue
25) Front ue cover plate
26) Rear ue cover plates
27) Flue scraper(not shown)
Ashes
28) Ash pan
29) Ash scraper(not shown)
30) Ash pan cover plate
Bladder assembly
31) Bladder
32) Bladder gate valve and hose
33) Water level gauge(not shown)
Thermocouples
34) Fire door thermocouple
35) Firebox thermocouple #1, #2, #3
36) Water thermocouple
Electrical
37) Electrical supply junction box
38) Electrical plug outlets
39) Water temperature high-limit
controller (aquastat)
40) Front light and combustion air
blower control switch(not shown)
Housing
41) Outer front door
42) Outer rear door
43) Roof
44) Sides(not shown)
45) Insulation(not shown)
Optional hot water internal coil
46) Internal coil(not shown)
Lift hook
47) Lift ring
48) Box of Chemical, Keys, Manual(not shown)

11
MINIMUM CLEARANCE SEPARATION SPECIFICATIONS
The HEATMORTM furnace, is certied to be installed outside, away from other buildings. Please observe the
following “Clearance to Combustibles” guidelines. If you have further questions, which are not addressed
in this Operators Manual, please contact your local dealer for further information.
-To HEATMORTM Stainless Steel Outdoor Furnace Back 96 Inches
-To HEATMORTM Stainless Steel Outdoor Furnace Top 18 Inches
-To HEATMORTM Stainless Steel Outdoor Furnace Front 48 Inches
-To HEATMORTM Stainless Steel Outdoor Furnace Chimney 96 Inches
-To HEATMORTM Stainless Steel Outdoor Furnace Sides 6 Inches
-Do not store combustible liquids or materials near the furnace.
-It is not recommended to install the furance in any form of building.
Before installing your HEATMORTM Stainless Steel Outdoor Furnace, if in the United States, always check
any and all applicable state and local regulations and inform your insurance agent.
Before installing your HEATMORTM Stainless Steel Outdoor Furnace, if in Canada, always check any and all
applicable Provincial and Municipal regulations and inform your insurance agent.
HEATMORTM Inc. strongly recommends not installing a HEATMORTM Stainless Steel Outdoor Furnace within
50 feet of any ammable structure.
A HEATMORTM Stainless Steel Outdoor Furnace should be located with consideration to your neighbor’s
property and in accordance with local ordinances. Refer to the “Best Burn Practices” for further operating
considerations.
HEATMORTM Stainless Steel Outdoor Furnaces are not designed or certied to be located in densely populated
areas.
CHAPTER 5

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CHAPTER 6
WARNINGS AND PRECAUTIONS
Please read the following list of cautions, warnings and dangers before installing and operating your
HEATMORTM Stainless Steel Outdoor Furnace. If you have any questions or concerns regarding any of the
following cautions, warnings or dangers or instructions in this Operations and Maintenance manual, please
contact your local dealer.
Familiarize yourself with the “Best Burn Practices” located on the inside front cover.
Installation
Installation should be performed by a qualied installer and will comply with all the requirements of
the authority having jurisdiction over the installation.
1) The HEATMORTM furnace is design fvor outside installation, away from other buildings.
2) Please observe the following “Clearance to Combustibles” guidelines.
To unit back = 96 inches To unit sides = 6 inches
To unit front = 48 inches To chimney = 96 inches
To unit top = 18 inches
3) Before installing the furnace, always check any and all applicable state, provincial, and local
regulations.
4) HEATMORTM strongly recommends not installing a HEATMORTM Stainless Steel Outdoor Furnace
within 50 feet of any ammable structure.
5) A HEATMORTM Stainless Steel Outdoor Furnace should be located with consideration to your
neighbor’s property and ina ccoradance with local ordinances. HEATMORTM Stainless Steel Outdoor
Furnace. are not designed to be located in densely populated areas.
6) HEATMORTM suggests the use of brass ttings when installing the unit.
7) Before installing the HEATMORTM furnace, contact and inform your insurance agent.
8) The HEATMORTM Outdoor Furnace is to be installed on a concrete base only. Any attempt to place
the furnace on any other surface may void the warranty.
9) Do not connect the HEATMORTM furnace to the chimney of any existing heating system.
10) This unit was not designed, nor is it recommended, for use as a stand-alone heating system. A
back up source of heat must be in place to prevent the outdoor furnace from freezing and to provide
supplementary heat for the heated buildings.
11) Do not pressurize the HEATMORTM Outdoor Furnace. This unit is designed to operature under
atmospheric pressure only.
12) Place the in-line ll/drain assembly in a location where the drained contexts of the HEATMORTM will
not cause damage to the surrounding areas or it’s contents.

13
Electrical
1) Do not connect the electrical components of the HEATMOR™ Outdoor Furnace to any other
electrical appliance.
2) This HEATMOR™ Outdoor Furnace operates on 115-volt power only. Do not connect the furnace to a 220-
volt electrical supply.
3) HEATMOR™ INC. recommends a licensed professional electrician make all the necessary
electrical connections involved with the installation of the furnace.
4) Always disconnect the HEATMOR™ Outdoor Furnace from the main electrical supply before
servicing any of the electrical components of the HEATMOR™ Outdoor Furnace.
5) Always disconnect any existing electrical connections to any in-house heating system, before
installing the outdoor furnace to any existing indoor heating system or appliances.
Other
1) The unit may be connected to an existing indoor boiler system by installing a water-to-water heat
exchanger.
1) HEATMOR™ INC. recommends that you contact a licensed professional plumber to make
all necessary plumbing installations between the HEATMOR™ furnace and the existing heating
system of your building(s).
2) Do not operate the HEATMOR™ furnace until all electrical and water line connections have
been properly installed and tested.
3) Do not allow any re in the rebox until the HEATMOR™ has the correct amount of water
installed.

14
CHAPTER 7
6”
BASE: OUTDOOR FURNACE SITS ON THIS PAD
55”
86”
36”
9.5”
10”
PATIO STONES OR SEPARATE CEMENT SLAB
FOR CONVENIENT LOADING
48”
MODEL 400-4S CONCRETE PAD SPECIFICATIONS
The actual pad size is 55” x 86”. This gives
approximately 1” extra on all sides of furnace.
CAUTION: Do not exceed this length measurement.
Width can be wider if desired.
The bottom of the loading door is 25” above ground
or base of furnace. If you desire to have the leading
door higher, you can do so by making the pad depth
thicker.
Example: 12” instead of 4” or any gure in between.
Patio stones or separate cement pad in front of the
loading door should NOT be attached to main base
of furnace.
It is recommended to use steel mesh or R-bar
in pad for strength.
Benefits to raising the pad:
1. Gives space below the ash cleanout to place a pail
for convenient ash removal.
2. Allows better visibility of the rebox.
3. Less bending when adding wood.
4. Keeps smoke above the operator.
5. Protects the bottom of the HEATMOR™.
HOLES FOR HOOK-UPS
OUTDOOR FURNACE SITS HERE GROUND
LEVEL
UNDERGROUND LINES
FIREBOX
DOOR
SIDE VIEW
OUTDOOR FURNACE SITS HERE
FOUR INCH GRAVEL BASE
CEMENT BASE LOADING AREA
CEMENT BASE 4” - 12”
HIGHER THAN WHERE
THE OPERATOR STANDS. PATIO STONES OR
SEPARATE CEMENT SLAB.

15
CHAPTER 8
INSTALLATION OF THE HEATMOR™ FURNACE
Installation should be performed by a qualied installer and will comply with all the requirements of
the authority having jurisdiction over the installation.
Principles
1) Need to seal the perimeter of the entire HEATMOR™ so rodents are not able to nd a home inside
the HEATMOR™.
2) Need to lift the HEATMOR™ without damaging it.
Equipment Required
1) It is not possible to lift a HEATMOR™ with the forks of a forklift under the
HEATMOR™. It must be lifted from the top, by the lifting hook. A crane or
heavy backhoe works best, although a heavy duty farm tractor is acceptable.
a) With a farm tractor, extreme care must be taken to prevent the
HEATMOR™ from swinging and causing damage to the HEATMOR™.
Placing the HEATMOR™ on the Concrete Base
2) Before setting the HEATMOR™ onto the concrete base, it is a
good idea to place a solid sheet of the proper “reective air foil” (also called
bubble foil) between the concrete and the HEATMOR™. This will absorb ridges
in the concrete and make it easier to apply caulking around the inside
perimeter of the base of the HEATMOR™. This reective foil will also reect
escaping heat up into the furnace, and help prevent air leaks into the rebox if
cement cracks.
3) Make sure the total area of the HEATMOR™ furnace is on solid concrete.
Do not let the HEATMOR™ extend past the hole in the concrete where the lines come in.
4) After the HEATMOR™ is in place perform the following;
Caulking around the Outside Perimeter of HEATMOR™
a) With a sharp knife, trim any excess bubble foil
that extends past the base of the HEATMOR™.
b) Apply a bead of caulking around the entire outside
perimeter of the HEATMOR™ to seal out rodents.
Lift Hook