Laars MagnaTherm MGH1600 User manual

Installation and Operation Instructions Document 1276D
H2359200D
WARNING
If the information in these instructions is
not followed exactly, a re or explosion
may result causing property damage,
personal injury or death.
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; do not
use any phone in your building.
• Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
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 gas
supplier.
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualied in hot water boiler and heater installation and maintenance. Improper installation and/or operation
could create carbon monoxide gas in ue gases which could cause serious injury, property damage, or
death. Improper installation and/or operation will void the warranty.
AVERTISSEMENT
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion ou
pour éviter tout dommage matériel, toute blessure
ou la mort.
Ne pas entreposer ni utiliser d’essence ou ni
d’autres vapeurs ou liquides inammables dans
le à proximité de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d’allumer d’appareils.
• Ne touchez à aucun interrupteur. Ne pas vous servir
des téléphones dans le bâtiment où vous vous trovez.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions du
fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le sservice des incendies.
L’installation et l’entretien doivent être assurés par
un installateur ou un service d’entretien qualié ou
par le fournisseur de gaz.
Modulating Boiler Water Heater
Model MGH1600 Model MGV1600
1,600 MBTU/h 1,600 MBTU/h
Model MGH2000 Model MGV2000
1,999 MBTU/h 1,999 MBTU/h
Model MGH2500 Model MGV2500
2,499 MBTU/h 2,499 MBTU/h
Model MGH3000 Model MGV3000
3,000 MBTU/h 3,000 MBTU/h
Model MGH3500 Model MGV3500
3,500 MBTU/h 3,500 MBTU/h
Model MGH4000 Model MGV4000
4,000 MBTU/h 4,000 MBTU/h
Installation and
Operation Instructions for
MAGNATHERM
®

LAARS Heating Systems
Section 1 - GENERAL INFORMATION
1.1 Introduction......................................................1
1.2 Safety Notes .....................................................1
1.3 ModelNomenclature/Identication ...............2
1.4 Warranty...........................................................2
1.5 Unit Overviews ( all sizes )...........................3-5
1.6 Dimensions.......................................................6
1.7 Unpacking ........................................................7
Section 2 - LOCATING THE APPLIANCE
2.1 Locating the Appliance.....................................7
2.2 Correct Vent Distance
from Outside Wall or Roof Termination...........7
Section 3 - VENTING AND COMBUSTION AIR
3.1 Combustion Air ................................................8
3.1.1 Combustion Air From Room............................8
3.1.2 Ducted Combustion Air....................................9
3.2 Venting .............................................................9
3.2.1 Common Venting............................................10
3.2.3 Venting Requirements Unique to Canada ......10
3.3 Locating the Vent and Combustion Air
Terminals........................................................11
3.3.1 Side Wall Vent Terminal.................................11
3.3.2 Side Wall Combustion Air Terminal ..............13
3.3.3 Vertical Vent Terminal....................................14
3.3.4 Vertical Combustion Air Terminal..................14
3.3.5 Installations in the Commonwealth of
Massachusetts.................................................14
3.4 Common Vent Test .........................................15
3.5 Outdoor Installation........................................16
Section 4 - GAS SUPPLY AND PIPING
4.0 Gas Supply and Piping...................................16
Section 5 - WATER FLOW REQUIREMENTS
5.1 MagnaTherm Boiler Flow and Head
Requirements..................................................18
5.2 MagnaTherm Water Heater Flow and Head
Requirements..................................................18
Table of Contents
i
Section 6 – WATER CONNECTIONS, MGH
6.1 MGH System Piping: Hot Supply
Connections....................................................19
6.2 MGH Cold Water Make-Up...........................19
6.3 MGH Freeze Protection..................................19
6.4 MGH Suggested Piping Schematics .........20-24
6.5 Condensate Drain Trap...............................20
Section 7 - WATER CONNECTIONS, MGV
7.1 MGV Water Quality .......................................25
7.2 MGV Suggested Piping Schematics...............25
7.3 MGV Piping Requirements............................25
7.4 MGV Cold Water Make-Up ...........................26
7.5 MGV Freeze Protection..................................26
7.6 MGV Water Flow...........................................27
7.7 Condensate Drain Trap...................................27
Section 8 – ELECTRICAL CONNECTIONS
8.1 Installation Warnings .....................................28
8.2 Main Power Connections ...............................28
8.3 Pump Connections and Operation..................29
8.4 Control Panel Layout......................................30
8.5 Wiring Diagrams .......................................32-35
8.6 High Voltage Wiring Diagrams .................36-40
8.7 Ladder Diagrams ......................................41-45

MagnaTherm Boilers and Water Heaters
Section 9 – NAVIGATING THE TOUCH SCREEN
9.1 The Touch Screen ..........................................46
9.2 Using the Touch Screen..................................46
9.3 VericationProcessforSafety-Related
Parameters......................................................48
9.4 While Operating - Checking Individual
Parameters......................................................49
9.5 ConguringParametersonIndividual
Controllers......................................................50
9.6 Setting the Date and Time on the
System Display......................51
9.7 CongurationMenus(ALL) ..........................52
9.7.1 SystemIdentication&Access......................52
9.7.2 CH-CentralHeatConguration....................53
9.7.3 OutdoorResetConguration .........................53
9.7.4 DHW-DomesticHotWaterConguration ...53
9.7.5 WarmWeatherShutdownConguration........53
9.7.6 DemandPriorityConguration......................53
9.7.7 ModulationConguration ..............................53
9.7.8 PumpConguration .......................................53
9.7.9 StatisticsConguration ..................................54
9.7.10 High Limits ....................................................54
9.7.11 Stack Limits....................................................54
9.7.12 Delta T Limits.................................................54
9.7.13 FrostProtectionConguration .......................54
9.7.14 Burner Control Ignition..................................56
9.7.15 SystemConguration.....................................56
9.7.16 SensorConguration......................................56
9.7.17 LeadLagSlaveConguration........................56
9.7.18 LeadLagMasterConguration .....................59
9.8 Parameter Defaults and Ranges......................59
9.9 Connections to a
Building Automation System .........................63
9.10 Vari-Prime Flow Control System...................64
9.11 Combustion Setup Procedure.........................65
Section 10 - INITIAL STARTUP INSTRUCTIONS
10.1 Filling the Boiler System................................68
10.2 Initial Operation .............................................69
10.2.1 Initial Burner Operation.................................69
10.2.2 Combustion Setup Procedure.........................69
10.3 Shutting Down the MagnaTherm...................69
10.4 Restarting the MagnaTherm...........................69
Section 11 – MAINTENANCE
11.1 System Maintenance.......................................70
11.2 Maintenance Notes.........................................70
11.2.1 Burner.............................................................70
11.2.2 Modulating Gas Valve/ Venturi......................70
11.2.3 Controller .......................................................71
11.2.4 Hot Surface Ignitor.........................................71
11.2.5 Flame Sensor..................................................71
11.2.6 Blower............................................................71
11.2.7 Heat Exchanger Tubes....................................72
11.2.8 Gas Pressure Switches....................................72
Section 12 – TROUBLESHOOTING
12.1 About Lockouts, Holds, and Alerts................73
12.1.1 Responding to a Lockout, Hold,
or Alert............................................................73
12.1.2 Viewing the Lockout and Alert
Histories .........................................................73
12.2 Troubleshooting Table...............................75-89
12.3 Diagnostic Tests and Input/Output
Indicators........................................................89
12.4 Lead/Lag Slave Diagnostics...........................90
12.5 Statistics .........................................................90
12.6 Analysis..........................................................90
12.7 Control Snapshot............................................91
12.8 Operating Sequence........................................91
Section 13 – REPLACEMENT PARTS
13.1 General Information.......................................92
13.2 Component Illustrations, Parts Lists,
and Part Numbers....................................93-107
13.2.1 Frame and Jacket Assembly...........................93
13.2.2 Final Assembly...............................................95
13.2.3 Waterway Outlet Assembly............................96
13.2.4 Blower Assy, Model 1600..............................97
13.2.5 Blower Assy, Model 2000..............................98
13.2.6 BlowerAssy,Models3500&3000................99
13.2.7 BlowerAssy,Models3500&4000..............101
13.2.8 Gas Train Assembly, Models1600thru 3000...103
13.2.9 GasTrainAssembly,Models3500&4000..105
13.2.10 Control Panel Assembly..............................107
13.2.11 Distribution Box Assemblies.......................108
ii

LAARS Heating Systems

MagnaTherm Boilers and Water Heaters
Page 1
Touch
Screen
Open the
front panel
to access
the Touch
Screen
Section 1
GENERAL INFORMATION
1.1 Introduction
is manual includes information which will
help you to install, operate, and maintain the
Magnaerm 1600, 2000, 2500, 3000, 3500 and 4000
systems. Please read this manual completely before
proceeding with the installation. If you have any
questions regarding this equipment, please consult
the LAARS Heating Systems factory, or a local
factory representative. Many operating problems are
caused by improper installation.
1.2 Safety Notes
DANGER
• Water temperature over 125°F (52°C) can cause
severe burns instantly or death from scalds.
• Children, disabled and elderly are at highest risk of
being scalded.
•See instruction manual before
setting temperature at
heating appliance.
•Feel water before
bathing or showering.
•If this appliance is used
to produce water that
could scald if too hot,
such as domestic hot water
use, adjust the outlet
control (limit) or use temperature limiting valves
to obtain a maximum water temperature of 125°F
(52°C).
WARNING
Fire or Explosion Hazard
Improper conguration can cause fuel buildup and
explosion. Improper user operation may result in
property loss, severe physical injury, or death.
Any changes to safety-related conguration
parameters must only be done by experienced and/
or licensed burner/boiler operators and mechanics.
If any odor of gas is detected, or if the gas burner
does not appear to be functioning in a normal
manner, close the main gas shuto valve. Do not
shut o the power switch. Contact your heating
contractor, gas company, or factory representative.
e Magnaerm Appliance is protected against over-
pressurization. A pressure relief valve is included with
each Magnaerm.
e inlet gas pressure to the appliance must not
exceed 13” W.C. (3.2 kPa).
All installations must be made in accordance with 1)
American National Standard Z223.1/NFPA54-Latest
Edition “National Fuel Gas Code” or 2) CSA B149.1
“Natural Gas and Propane Installation Code” and with
the requirement of the local utility or other authorities
having jurisdiction. Such applicable requirements take
precedence over the general instructions contained
herein.
WARNING
Carbon Monoxide Hazard
Improper adjustment of the burners may lead to poor
combustion quality, increasing the amount of carbon
monoxide produced. Excessive carbon monoxide
levels may lead to personal injury or death.

LAARS Heating Systems
Page 2
Model Nomenclature
1 2 3 4 5 6 7 8 9 10 11 12 13
M G 1
SERIES
M G USAGE
H - HYDRONIC
V - VOLUME
WATER
SIZE
MBTU/h
1600
2000
2500
3000
3500
4000
FUEL
N - NATURAL
P - PROPANE
COUNTRY
CODE
X - USA/
CANADA
E - EXPORT*
OPTIONS CODE
X - STANDARD
J- CSD-1
ELEC SYSTEM
A - 110V, 1Ø
B - 220V, 1Ø
C - 208V, 3Ø
D - 480V, 3Ø
E - 600V, 3Ø
REVISION
1 -FIRST
ASME
X - “H” STAMP (MGH)
W -“HLW” STAMP(MGV)
1.4 Warranty
LAARS Heating Systems MagnaTherm boilers are
covered by a limited warranty. The owner should
complete the warranty registration at
http://www.LAARS.com
ALL WARRANTY CLAIMS must be made by an
authorized LAARS Heating Systems representative.
Claims must include the serial number and model
(this information can be found on the rating plate).
All claims must also include the installation date and
name of the installer. Shipping costs are not included
in the warranty coverage.
1.3 ModelIdentication
Consult the rating plate on the unit. The following
information describes the model number structure.
(1-2) Model Series Designation
M G = MagnaTherm
(3) Usage
H = Hydronic
V = Volume Water
(4-7) Size
1 6 0 0 = 1,600,000 BTU/hr input
2 0 0 0 = 1,999,000 BTU/hr input
2 5 0 0 = 2,499,000 BTU/hr input
3 0 0 0 = 3,000,000 BTU/hr input
3 5 0 0 = 3,500,000 BTU/hr input
4 0 0 0 = 4,000,000 BTU/hr input
(8) Fuel
N = Natural Gas
P = LP Gas
(9) Country Code
X = USA / CANADA
E - Export (CE - non CSA)
(10) Option Code
X = Standard Unit
J = CSD1 Version
(11) Electrical System
A - 110V, (Single Phase)
B - 220V, (Single Phase)
C - 208V, (Three Phase)
D - 480V, (Three Phase)
E - 600V, (Three Phase)
(12) Additional Options
X - “H” STAMP (MGH)
W - “HLW” STAMP (MGV)
(13) Revision
1 = First
*Not CSA approved
Altitude: Gas input rating of the MagnaTherm shall be
used for elevations up to 2000 ft (600 m). The input
rating at elevations above 2000 ft (600 m) shall be
reduced at a rate of 4 percent for each 1000 ft (300 m)
above sea level before selecting the equipment size.
WARNING
Electrical Shock Hazard
Electrical shock can cause severe injury, death or
property damage. Disconnect the power supply before
beginning installation or changing the wiring to
prevent electrical shock or damage to the equipment.
It may be necessary to turn o more than one power
supply disconnect.
All electrical wiring is to be done in accordance with
local codes, or in the absence of local codes, with:
1) e National Electrical Code ANSI/NFPA No.
70 - latest Edition, or 2) CSA STD. C22.1 “Canadian
Electrical Code - Part 1.” is appliance must be
electrically grounded in accordance with these codes.
WARNING
Magnaerm units must be installed in
accordance with the procedures detailed in this
manual, or the LAARS Heating Systems warranty
will be voided. e installation must conform to
the requirements of the local jurisdiction having
authority, and, in the United States, to the latest
edition of the National Fuel Gas Code, ANSI
Z223.1/NFPA54. In Canada, the installation
must conform to the latest edition of CSA
B149.1 Natural Gas and Propane Gas Installation
Code, and/or local codes. Where required by the
authority having jurisdiction, the installation
of Magnaerm boilers must conform to the
Standard for Controls and Safety Devices for
Automatically Fired Boilers, ANSI/ASME CSD-1.
Any modications to the boiler, its gas controls, or
wiring may void the warranty. If eld conditions
require modications, consult the factory
representative before initiating such modications.

MagnaTherm Boilers and Water Heaters
Page 3
Models 1600 and 2000
Manual
gas valve
Blower
Touch Screen
Heat Exchanger
Condensing Unit
Air Intake and
Filter
Water Outlet
Water Inlet
Vent
Power Pack
Perspective from opposite corner.
Perspective from front left corner of unit.
Shown with front doors and left side
panels removed.
Condensate
Trap
1.5 Unit Overviews
The next 3 pages give a visual reference to the basic
component locations of the LAARS MagnaTherm.

LAARS Heating Systems
Page 4
Manual
gas valve
Blower
Touch Screen
Models 2500 and 3000
Air Intake and
Filter
Water Outlet
Water Inlet
Vent
Power Pack
Condensate
Trap
Heat Exchanger
Condensing Unit

MagnaTherm Boilers and Water Heaters
Page 5
Models 3500 and 4000
Manual
gas valve
(hidden behind main
gas valve)
Blower
Touch Screen
Air Intake and
Filter
Water Outlet
Water Inlet
Vent
Power Pack
Condensate
Trap
Heat Exchanger
Condensing Unit

LAARS Heating Systems
Page 6
E
F
U
B
A
VIEW
REAR
N Q S
P
M
R
L
G
H
K
J
T
FRONT
VIEWSIDE
VIEW
C D
Condensate Trap
Contact
Factory
Oponal
Flanges,
Vent
Gas
6”x3.5”
Touchscreen
Display
Air Inlet
Pressure
Relief
Valve
Water
Outlet
‘Knock-
down’
Height
Water
Inlet
H
J
Gas
Air Inlet
Model 4000
The Model 4000 varies from other sizes in the locaon of it’s Air Inlet and Gas Supply.
G K
VIEWREAR
Model A B C D E F G H J K L M N P Q R S T U
Vent Ø Air Inlet Ø
Inches (cm)Inches (cm)Inches (cm)
1600
29.3 (75) 79.8 (203)38 (96) 57.5 (147) 49.8 (126) 4.8 (12) 60.8 (154) 2.6 (7) 8.4 (21) 68.4 (171) 4 (10) 39.2 (100) 30.4 (77)16 (41)23 (58) 10.2 (26)14 (36)13 (33) 6.3 (16) 6 (15) 6 (15) 60.8 (154)
2000
29.3 (75) 79.8 (203)38 (96) 57.5 (147) 49.8 (126) 4.8 (12) 60.8 (154) 2.6 (7) 8.4 (21) 67.4 (171) 4 (10) 39.2 (100) 30.4 (77)16 (41)23 (58) 10.2 (26)14 (36)13 (33) 6.3 (16) 8 (20) 8 (20) 60.8 (154)
2500 30.8 (78) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16)71 (180) 4 (10) 9.8 (25) 76.4 (194) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30) 18.3 (46) 14.8 (38) 6 (15) 8 (20) 8 (20) 71.0 (180)
3000 30.8 (78) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16)71 (180) 4 (10) 8.9 (23) 76.8 (195) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30) 18.3 (46) 14.8 (38) 6 (15)10 (25)10 (25) 71.0 (180)
3500
34.5 (88)97 (246)52 (133)70 (178) 60.8 (154) 6.4 (16) 80.8 (205) 28.8 (73) 26.5 (67) 85.6 (217) 6.5 (16) 51.3 (130)40 (102) 21.6 (55) 30.7 (78)13 (33)16 (41) 17.4 (44) 6.7 (17)10 (25) 10 (25) 80.8 (205)
4000
34.5 (88)97 (246)52 (133)70 (178) 60.8 (154) 6.4 (16) 80.8 (205) 28.8 (73) 26.5 (67) 85.6 (217) 6.5 (16) 51.3 (130)40 (102) 21.6 (55) 30.7 (78)13 (33)16 (41) 17.4 (44) 6.7 (17)12 (30)12 (30) 80.8 (205)
Model A B C D E F G H J K L M N P Q R S T U
Vent Ø Air Inlet Ø
Inches (cm)Inches (cm)Inches (cm)
1600
29.3 (75) 79.8 (203)38 (96) 57.5 (147) 49.8 (126) 4.8 (12) 60.8 (154) 2.6 (7) 8.4 (21) 68.4 (171) 4 (10) 39.2 (100) 30.4 (77)16 (41)23 (58) 10.2 (26)14 (36)13 (33) 6.3 (16) 6 (15) 6 (15) 60.8 (154)
2000
29.3 (75) 79.8 (203)38 (96) 57.5 (147) 49.8 (126) 4.8 (12) 60.8 (154) 2.6 (7) 8.4 (21) 67.4 (171) 4 (10) 39.2 (100) 30.4 (77)16 (41)23 (58) 10.2 (26)14 (36)13 (33) 6.3 (16) 8 (20) 8 (20) 60.8 (154)
2500 30.8 (78) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16)71 (180) 4 (10) 9.8 (25) 76.4 (194) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30) 18.3 (46) 14.8 (38) 6 (15) 8 (20) 8 (20) 71.0 (180)
3000 30.8 (78) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16)71 (180) 4 (10) 8.9 (23) 76.8 (195) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30) 18.3 (46) 14.8 (38) 6 (15)10 (25)10 (25) 71.0 (180)
3500
34.5 (88)97 (246)52 (133)70 (178) 60.8 (154) 6.4 (16) 80.8 (205) 28.8 (73) 26.5 (67) 85.6 (217) 6.5 (16) 51.3 (130)40 (102) 21.6 (55) 30.7 (78)13 (33)16 (41) 17.4 (44) 6.7 (17)10 (25) 10 (25) 80.8 (205)
4000
34.5 (88)97 (246)52 (133)70 (178) 60.8 (154) 6.4 (16) 80.8 (205) 28.8 (73) 26.5 (67) 85.6 (217) 6.5 (16) 51.3 (130)40 (102) 21.6 (55) 30.7 (78)13 (33)16 (41) 17.4 (44) 6.7 (17)12 (30)12 (30) 80.8 (205)
Model A B C D E F G H J K L M N P Q R S T U
Vent Ø Air Inlet Ø
Inches (cm)Inches (cm)Inches (cm)
1600
29.3 (75) 79.8 (203)38 (96) 57.5 (147) 49.8 (126) 4.8 (12) 60.8 (154) 2.6 (7) 8.4 (21) 68.4 (171) 4 (10) 39.2 (100) 30.4 (77)16 (41)23 (58) 10.2 (26)14 (36)13 (33) 6.3 (16) 6 (15) 6 (15) 60.8 (154)
2000
29.3 (75) 79.8 (203)38 (96) 57.5 (147) 49.8 (126) 4.8 (12) 60.8 (154) 2.6 (7) 8.4 (21) 67.4 (171) 4 (10) 39.2 (100) 30.4 (77)16 (41)23 (58) 10.2 (26)14 (36)13 (33) 6.3 (16) 8 (20) 8 (20) 60.8 (154)
2500 30.8 (78) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16)71 (180) 4 (10) 9.8 (25) 76.4 (194) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30) 18.3 (46) 14.8 (38) 6 (15) 8 (20) 8 (20) 71.0 (180)
3000 30.8 (78) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16)71 (180) 4 (10) 8.9 (23) 76.8 (195) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30) 18.3 (46) 14.8 (38) 6 (15)10 (25)10 (25) 71.0 (180)
3500
34.5 (88)97 (246)52 (133)70 (178) 60.8 (154) 6.4 (16) 80.8 (205) 28.8 (73) 26.5 (67) 85.6 (217) 6.5 (16) 51.3 (130)40 (102) 21.6 (55) 30.7 (78)13 (33)16 (41) 17.4 (44) 6.7 (17)10 (25) 10 (25) 80.8 (205)
4000
34.5 (88)97 (246)52 (133)70 (178) 60.8 (154) 6.4 (16) 80.8 (205) 28.8 (73) 26.5 (67) 85.6 (217) 6.5 (16) 51.3 (130)40 (102) 21.6 (55) 30.7 (78)13 (33)16 (41) 17.4 (44) 6.7 (17)12 (30)12 (30) 80.8 (205)
Model A B C D E F G H J K L M N P Q R S T U
Vent Ø Air Inlet Ø
Inches (cm)Inches (cm)Inches (cm)
1600
29.3 (75) 79.8 (203)38 (96) 57.5 (147) 49.8 (126) 4.8 (12) 60.8 (154) 2.6 (7) 8.4 (21) 68.4 (171) 4 (10) 39.2 (100) 30.4 (77)16 (41)23 (58) 10.2 (26)14 (36)13 (33) 6.3 (16) 6 (15) 6 (15) 60.8 (154)
2000
29.3 (75) 79.8 (203)38 (96) 57.5 (147) 49.8 (126) 4.8 (12) 60.8 (154) 2.6 (7) 8.4 (21) 67.4 (171) 4 (10) 39.2 (100) 30.4 (77)16 (41)23 (58) 10.2 (26)14 (36)13 (33) 6.3 (16) 8 (20) 8 (20) 60.8 (154)
2500 30.8 (78) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16)71 (180) 4 (10) 9.8 (25) 76.4 (194) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30) 18.3 (46) 14.8 (38) 6 (15) 8 (20) 8 (20) 71.0 (180)
3000 30.8 (78) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16)71 (180) 4 (10) 8.9 (23) 76.8 (195) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30) 18.3 (46) 14.8 (38) 6 (15)10 (25)10 (25) 71.0 (180)
3500
34.5 (88)97 (246)52 (133)70 (178) 60.8 (154) 6.4 (16) 80.8 (205) 28.8 (73) 26.5 (67) 85.6 (217) 6.5 (16) 51.3 (130)40 (102) 21.6 (55) 30.7 (78)13 (33)16 (41) 17.4 (44) 6.7 (17)10 (25) 10 (25) 80.8 (205)
4000
34.5 (88)97 (246)52 (133)70 (178) 60.8 (154) 6.4 (16) 80.8 (205) 28.8 (73) 26.5 (67) 85.6 (217) 6.5 (16) 51.3 (130)40 (102) 21.6 (55) 30.7 (78)13 (33)16 (41) 17.4 (44) 6.7 (17)12 (30)12 (30) 80.8 (205)
Model A B C D E F G H J K L M N P Q R S T U
Vent Ø Air Inlet Ø
Inches (cm)Inches (cm)Inches (cm)
1600
29.3 (75) 79.8 (203)38 (96) 57.5 (147) 49.8 (126) 4.8 (12) 60.8 (154) 2.6 (7) 8.4 (21) 68.4 (171) 4 (10) 39.2 (100) 30.4 (77)16 (41)23 (58) 10.2 (26)14 (36)13 (33) 6.3 (16) 6 (15) 6 (15) 60.8 (154)
2000
29.3 (75) 79.8 (203)38 (96) 57.5 (147) 49.8 (126) 4.8 (12) 60.8 (154) 2.6 (7) 8.4 (21) 67.4 (171) 4 (10) 39.2 (100) 30.4 (77)16 (41)23 (58) 10.2 (26)14 (36)13 (33) 6.3 (16) 8 (20) 8 (20) 60.8 (154)
2500 30.8 (78) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16)71 (180) 4 (10) 9.8 (25) 76.4 (194) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30) 18.3 (46) 14.8 (38) 6 (15) 8 (20) 8 (20) 71.0 (180)
3000 30.8 (78) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16)71 (180) 4 (10) 8.9 (23) 76.8 (195) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30) 18.3 (46) 14.8 (38) 6 (15)10 (25)10 (25) 71.0 (180)
3500
34.5 (88)97 (246)52 (133)70 (178) 60.8 (154) 6.4 (16) 80.8 (205) 28.8 (73) 26.5 (67) 85.6 (217) 6.5 (16) 51.3 (130)40 (102) 21.6 (55) 30.7 (78)13 (33)16 (41) 17.4 (44) 6.7 (17)10 (25) 10 (25) 80.8 (205)
4000
34.5 (88)97 (246)52 (133)70 (178) 60.8 (154) 6.4 (16) 80.8 (205) 28.8 (73) 26.5 (67) 85.6 (217) 6.5 (16) 51.3 (130)40 (102) 21.6 (55) 30.7 (78)13 (33)16 (41) 17.4 (44) 6.7 (17)12 (30)12 (30) 80.8 (205)
'Knock-
down'
Height
Model Size Water Gas
Condensate
Connection Connection Line
1600
3" Groove Lock (or flange) 2" NPT 1"
2000
3" Groove Lock
(or flange) 2" NPT 1"
2500 3" Groove Lock (or flange) 2" NPT 1"
3000 3" Groove Lock (or flange) 2" NPT 1"
3500
4" Groove Lock (or flange) 2" NPT 1"
4000
4" Groove Lock
(or flange) 2" NPT 1"
Models 3500 and 4000 differ from the other sizes in the location of theirAir Inlet and Gas Supply.
Models 3500 / 4000
1.6 Dimensions
Figure 1. Dimensions

MagnaTherm Boilers and Water Heaters
Page 7
Section 2
LOCATING THE APPLIANCE
2.1 Locating the Appliance
The MagnaTherm may be installed indoors or
outdoors. If installing outdoors in a location that
may experience freezing temperatures, precautions
must be taken to prevent water in the heat exchanger
and condensate inside and outside of the boiler from
freezing. Damage due to freezing water or condensate
is not covered by the warranty.
Choose a location for the unit which allows clearances
on all sides for maintenance and inspection. See Table 1.
Always install the unit on a rm, level surface.
The unit should not be located in an area where
leakage of any connections will result in damage to
the area adjacent to the appliance, or to lower oors
of the structure.
When this type of location is not available, install
a suitable drain pan, adequately drained, under the
appliance.
The appliance is design-certied by CSA-
International for installation on combustible
ooring; in basements; in utility rooms or alcoves.
MagnaTherm boilers must never be installed on
carpeting. The location for the appliance should
be chosen with regard to the vent pipe lengths and
external plumbing.
The unit shall be installed such that the gas ignition
system components are protected from water (dripping,
spraying, rain, etc.) during operation and service
(circulator replacement, control replacement, etc.).
When vented vertically, the MagnaTherm must be
located as close as practical to the vertical section
of the vent. If the vent terminal and/or combustion
air terminal terminate through a wall, and there is
potential for snow accumulation in the local area, both
terminals should be installed at an appropriate level
above grade or the maximum expected snow line.
The dimensions and requirements that are shown in
Table 1 should be met when choosing the locations
for the appliance.
2.2 Correct Vent Distance from
Outside Wall or Roof Termination
The forced draft combustion air blower in the
appliance has sufcient power to vent properly when
the guidelines in Table 2 are followed.
1.7 Unpacking
The MagnaTherm is shipped in a single crate.
Remove all packing and tie-down materials.
Note - When located on the same wall, the
MagnaTherm combustion air intake terminal must be
installed a minimum of 12” (30cm) below the exhaust
terminal. There must also be a minimum horizontal
distance from intake to the exhaust terminal
of 84” (213cm) See Figure 4
APPLIANCE SUGGESTED SERVICEACCESS CLEARANCE
SURFACE INCHES CM
Front 24 61
Left Side 820
Right Side 820
Back 24 61
Top, 1600 & 2000 12 30
Top, 2500 & 3000 15 38
Top, 4000 24 61
APPLIANCE REQUIRED CLEARANCE TO COMBUSTIBLES
SURFACE INCHES CM
Front 18 45
Left Side 415
Right Side 415
Back 11 15
Top 12.5
Vent 12.5
Table 1. Clearances
INTAKE / EXHAUST
MAX EQUIVALENT
SIZE DIAMETER FT. M
1600 6” 100 30
2000 & 2500 8” 100 30
3000 & 3500 10” 100 30
4000 12” 100 30
Installations in the U.S. require exhaust vent pipe that is CPVC
complying with ANSI/ASTM D1785 F441, polypropylene
complying with ULC S636, or stainless steel complying with
UL1738. Installations in Canada require exhaust vent pipe that
is certied to ULC S636.
Intake (air) pipe must be PVC or CPVC that complies with
ANSI/ASTM D1785 F441, ABS that complies with ANSI/ASTM
D1527, stainless steel, or galvanized material.
To calculate max equivalent length, measure the linear feet of
the pipe, and add 5 feet (1.5 m) for each elbow used.
Table 2. Vent / Air Pipe Sizes

LAARS Heating Systems
Page 8
commencing within 12” (300 mm) of the top and
one commencing within 12” (300 mm) of the
bottom, of the enclosure shall be provided. The
openings shall communicate directly, or by ducts,
with the outdoors or spaces that freely communicate
with the outdoors. When directly communicating
with the outdoors, or when communicating to the
outdoors through vertical ducts, each opening shall
have a minimum free area of 1 square inch per
4000 Btu/hr (550 square mm/kW) of total input
rating of all equipment in the enclosure. When
communicating to the outdoors through horizontal
ducts, each opening shall have a minimum free
area of not less than 1square inch per 2000 Btu/
hr (1100 square mm/kW) of total input rating of all
equipment in the enclosure.
Method 2: One permanent opening, commencing
within 12” (300 mm) of the top of the enclosure,
shall be permitted. The opening shall directly
communicate with the outdoors or shall
communicate through a vertical or horizontal duct
to the outdoors or spaces that directly communicate
Section 3
VENTING AND COMBUSTION AIR
3.1 Combustion Air
MagnaTherm boilers and water heaters must have
provisions for combustion and ventilation air in
accordance with the applicable requirements for
Combustion Air Supply and Ventilation in the
National Fuel Gas Code, ANSI Z223 1; or in Canada,
the Natural Gas and Propane Installation Code, CSA
B149.1. All applicable provisions of local building
codes must also be adhered to.
A MagnaTherms can take combustion air
from the space in which it is installed, or the
combustion air can be ducted directly to the unit.
Ventilation air must be provided in either case.
3.1.1 Combustion Air From Room
In the United States, the most common requirements
specify that the space shall communicate with the
outdoors in accordance with Method 1 or 2. (See the
following descriptions.) Where ducts are used, they
shall be of the same cross-sectional area as the free
area of the openings to which they connect.
Method 1: Two permanent openings, one
Table 3. Ducted Air Accessories
(Place in section 3.1)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Screen for horizontal galvanized air pipe D2012104 D2012101 D2012101 D2012102 D2012103 D2012103
Screen for horizontal PVC air pipe CA012004 CA012001 CA012001 CA012002 CA012003 CA012003
Screen for horizontal polypropylene air pipe CA012204 CA012201 CA012201 CA012202 CA012203 CA012203
Screen for vertical galvanized air pipe D2012204 D2012201 D2012201 D2012202 D2012203 D2012203
Screen for vertical PVC air pipe CA012404 CA012401 CA012401 CA012402 CA012403 CA012403
Screen for vertical polypropylene air pipe CA012604 CA012601 CA012601 CA012602 CA012603 CA012603
Table 3a - Ducted Air Accessories
(Place in section 3.2)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Horizontal vent terminal for stainless steel D2012004 D2012001 D2012001 D2012002 D2012003 D2012003
Screen for horizontal CPVC vent CA012104 CA012101 CA012101 CA012102 CA012103 CA012103
Screen for vertical stainless steel vent D2012304 D2012301 D2012301 D2012302 D2012303 D2012303
Screen for vertical CPVC vent CA012504 CA012501 CA012501 CA012502 CA012503 CA012503
Table 3* - Vent Accessories
(Place in section 3.5)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Air intake screen for unit placed outdoors CA0011904 CA011901 CA011901 CA011902 CA0011903 CA0011903
Vent terminal for unit placed outdoors CA011803 CA011801 CA011801 CA011802 CA011803 CA011803
Table 3** - Air & Vent Accessories for Units Placed Outdoors
Table 4. Required Combustion Air Pipe Material
Material United States Canada
ABS ANSI/ASTM D1527 The air pipe material must be chosen based upon
the intended application of the boiler, and must
be installed according to the vent manufacturer’s
installation instructions.
PVC, sch. 40 ANSI/ASTM D1785 or D2665
CPVC, sch. 40 ANSI/ASTM F441
Single wall galv. steel 26 gauge
Polypropylene ULC S636 Class 2C

MagnaTherm Boilers and Water Heaters
Page 9
with the outdoors and shall have a minimum free
area of 1square inch per 3000 Btu/hr (734 square
mm/kW) of the total input rating of all equipment
located in the enclosure. This opening must not be
less than the sum of the areas of all vent connectors
in the conned space.
Other methods of introducing combustion and
ventilation air are acceptable, providing they
conform to the requirements in the applicable codes
listed above.
In Canada, consult local building and safety codes
or, in absence of such requirements, follow CAN/
CSA B149.
3.1.2 Ducted Combustion Air
The combustion air can be taken through the wall, or
through the roof. LAARS offers accessories to use
with ducted air systems, as shown in Table 3.
See Table 4 to select the appropriate diameter air
pipe. When taken from the roof, a eld-supplied
rain cap or an elbow arrangement must be used to
prevent entry of rain water. (See Figure 6).
Use ABS, PVC, CPVC, polypropylene, stainless
steel, or galvanized pipe for the combustion air
intake. (See Table 4) The intake must be sized per
Table 2. Route the intake to the boiler as directly
as possible. Seal all joints. Provide adequate
hangers. The unit must not support the weight of
the combustion air intake pipe. The maximum
equivalent pipe length allowed is 100 feet (30 m).
Each elbow is considered to be 5 feet (1.5m)
When using polypropylene or stainless steel
materials in horizontal duct congurations, a single
elbow must be installed on the end of the air inlet
to act as an outdoor terminal. In vertical duct
applications, two elbows must be installed on the
end of the inlet to act as a vent terminal. When
elbows are use as terminals, appropriate screens
must be installed to prevent blockage.
The elbow(s) required for termination are not
included in the kits sown in Table 3
The connection for the intake air pipe is on the back
panel.
In addition to air needed for combustion, air shall
also be supplied for ventilation, including air
required for comfort and proper working conditions
for personnel. Refer to the applicable codes.
3.2 Venting
WARNING
Selection of improper vent materials for
installations that are installed in closets, or will be
operated in high ambient temperature levels, may
lead to property damage, personal injury, or death.
WARNING
Failure to use the appropriate vent material,
installation techniques, or glues and sealants
could lead to vent failure causing property
damage, personal injury or death.
WARNING
All venting must be installed according to this
manual and any other applicable local codes,
including but not limited to, ANSI Z223.1/NFPA54,
CSA B149.1, CSAB149.2 and ULC S636. Failure
to follow this manual and applicable codes may
lead to property damage, severe injury, or death.

LAARS Heating Systems
Page 10
If the system temperatures are unknown at the
time of installation, class IIC or higher venting
material is recommended.
The MagnaTherm is a Category IV appliance and
may be installed with the standards listed on Table 6.
The unit’s vent can terminate through the roof, or
through an outside wall.
All installations must be done following the vent
supplier’s recommended installation techniques.
If these are not available, refer to the LAARS
recommendations for the material used.
NOTE: For Category IV boilers, have horizontal
runs sloping upwards not less than 1/4 inch
per foot (21 mm/m) from the boiler to the
vent terminal; be installed so as to prevent
accumulation of condensate; and, where necessary,
have means provided for drainage of condensate.
ATTENTION: Pour la catégorie IV, les chaudières
ont horizontal en pente vers le haut au moins
1/4 de pouce par pied (21 mm/m) à partir de la
chaudière pour l’évent borne; être installé de façon
à éviter l’accumulation de condensats; et, le cas
échéant, ont des moyens prévus pour l’évacuation
des condensats.
This will allow the condensate to run back to the
MagnaTherm to drain. Route the vent pipe to the
heater as directly as possible. Seal all joints. Provide
adequate hangers as required in the venting system
manufacturer’s Installation Instructions, or at least
every 4 feet.
The unit must not support the weight of the vent
pipe. The maximum equivalent pipe length allowed
is 100 feet (30m). Each elbow is considered to be 5
feet (1.5m). LAARS offers accessories to use with
horizontal and vertical exhaust vent systems, as
shown in Table 5
3.2.1 Common Venting
The MagnaTherm can be common vented, however,
the common venting must be a professionally
designed and approved system. MagnaTherm
units are never permitted to share a vent with any
Catagory 1 appliances.
3.2.3 Venting Requirements Unique to
Canada
MagnaTherm boilers and water heaters are Vent
Category IV appliances. Per the requirements of
Table 5. Vent Accessories
(Place in section 3.1)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Screen for horizontal galvanized air pipe D2012104 D2012101 D2012101 D2012102 D2012103 D2012103
Screen for horizontal PVC air pipe CA012004 CA012001 CA012001 CA012002 CA012003 CA012003
Screen for horizontal polypropylene air pipe CA012204 CA012201 CA012201 CA012202 CA012203 CA012203
Screen for vertical galvanized air pipe D2012204 D2012201 D2012201 D2012202 D2012203 D2012203
Screen for vertical PVC air pipe CA012404 CA012401 CA012401 CA012402 CA012403 CA012403
Screen for vertical polypropylene air pipe CA012604 CA012601 CA012601 CA012602 CA012603 CA012603
Table 3a - Ducted Air Accessories
(Place in section 3.2)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Horizontal vent terminal for stainless steel D2012004 D2012001 D2012001 D2012002 D2012003 D2012003
Screen for horizontal CPVC vent CA012104 CA012101 CA012101 CA012102 CA012103 CA012103
Screen for vertical stainless steel vent D2012304 D2012301 D2012301 D2012302 D2012303 D2012303
Screen for vertical CPVC vent CA012504 CA012501 CA012501 CA012502 CA012503 CA012503
Table 3* - Vent Accessories
(Place in section 3.5)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Air intake screen for unit placed outdoors CA0011904 CA011901 CA011901 CA011902 CA0011903 CA0011903
Vent terminal for unit placed outdoors CA011803 CA011801 CA011801 CA011802 CA011803 CA011803
Table 3** - Air & Vent Accessories for Units Placed Outdoors
Installation Standards
Material United States Canada
Stainless steel UL 1738 Venting must be ULC S636 certied for use as
venting material. The venting material class must
be chosen based upon the intended application
of the boiler, and must be installed according to
the maximum ue gas temperature and the vent
manufacturer’s instructions.
CPVC, sch 40 ANSI/ASTM F441
Polypropylene
Pending APPROVAL ULC S636 Class 2C
Table 6. Required Exhaust Vent Material

MagnaTherm Boilers and Water Heaters
Page 11
CAN/CSA-B149.1, only BH vent systems can be
connected to these units and such vent systems,
either ULC S636 certied stainless steel or other
ULC S636 certied BH vent (eg. plastics) must
be installed per the vent manufacturer’s certied
installation instructions.
It is the responsibility of the appropriately licensed
technician installing this MagnaTherm to use
ULC S636 certied vent material consistent with
the requirements as described in the Venting and
Combustion Air section.
Class I venting systems are suitable for gas-red
appliances producing ue gas temperature of more
than 135°C, but not more than 245°C.
Class II venting systems are suitable for gas-red
appliances producing ue gas temperatures of 135°C
or less.
Class II venting systems are further classied into
four temperature ratings as follows:
A Up to and including 65°C / 149°F
B Up to and including 90°C / 194°F
C Up to and including 110°C / 230°F and
D Up to and including 135°C / 275°F
Flue Gas Sampling Port -
It is also the responsibility of the installer to ensure
that a ue gas sampling port is installed in the vent
system. This ue gas sampling port must be installed
near the ue connection of the MagnaTherm: within
2 feet of the ue connection. There is no ue gas
sampling port internal to the MagnaTherm, so one
must be installed in the vent system external to the
MagnaTherm. A ue gas sampling port available as
a component of the ULC S636 certied vent system
is preferred. However, if one is not available with
the certied vent system, LAARS suggests using
a tee with the branch connection sized to allow for
insertion of a ue gas analyzer probe. The branch
connection must be resealable with a cap or other
means to ensure the vent system remains sealed.
(See Figure 2)
Consideration must be given to the placement
and orientation of the ue gas sampling port to
ensure that condensate is free to ow back into the
MagnaTherm and not collect anywhere in the vent
system - including in the ue gas sampling port.
Exhaust Vent Terminal -
An exhaust vent terminal must be installed. If an
exhaust vent terminal is not available with the
certied vent system, LAARS suggests the use of
a coupler tting from the certied vent system into
which the vent terminal screen can be installed.
Be sure to install and terminate both vent and
combustion air pipes per the instructions in this
section.
3.3 Locating the Vent and Combustion
Air Terminals
3.3.1 Side Wall Vent Terminal
The appropriate LAARS side wall vent terminal
must be used. The terminal must be located in
accordance with ANSI Z223.1/NFPA 54 and
applicable local codes. In Canada, the installation
must be in accordance with CSA B149.1 or .2 and
local applicable codes.
Consider the following when installing the terminal:
1. Figure 4 shows the requirements for
mechanical vent terminal clearances for the
U.S. and Canada.
2. Vent terminals for condensing appliances or
appliances with condensing vents are not
permitted to terminate above a public walkway,
or over an area where condensate or vapor
could create a nuisance or hazard.
3. Locate the vent terminal so that vent gases
cannot be drawn into air conditioning system
inlets.
4. Locate the vent terminal so that vent gases
cannot enter the building through doors,
windows, gravity inlets or other openings.
Figure 2. Test Port

LAARS Heating Systems
Page 12
*When vent terminal is less than 10 feet (3 m) horizontally
from a forced air inlet, the terminal must be at least 3 feet
(0.9 m) above the air inlet. (US only)
Figure 3. Combustion Air and Vent Through Side Wall
U.S. Installations (see note 1) Canadian Installations (see note 2)
A= Clearance above grade, veranda, porch, 12 inches (30 cm) 12 inches (30 cm)
deck, or balcony See note 6 See note 6
B= Clearance to window or door that may be Direct vent only: 12 inches (30 cm); 36 inches (91 cm)
opened Other than Direct vent: 4 ft (1.2m) below or to
side of opening; 1 ft (30 cm) above opening
C= Clearance to permanently closed window See note 4 See note 5
D= Vertical clearance to ventilated soft located
above the terminal within a horizontal See note 4 See note 5
distance of 2 feet (61 cm) from the center
line of the terminal
E= Clearance to unventilated soft See note 4 See note 5
F= Clearance to outside corner See note 4 See note 5
G= Clearance to inside corner See note 4 See note 5
H= Clearance to each side of center line 3 feet (91 cm) within a height 15 feet
extended above meter/regulator assembly See note 4 above the meter/regulator assembly
I= Clearance to service regulator vent outlet See note 4 3 feet (91 cm)
J= Clearance to nonmechanical air supply Direct vent only: 36” (91cm)
inlet to building or the combustion air inlet Other than Direct vent: 4 ft (1.2m) below 36 inches (91 cm)
to any other appliance or to side of opening; 1 ft (30 cm) above opening
K= Clearance to a mechanical air supply inlet 3 feet (91 cm) above if within 10 feet (3 m) 6 feet (1.83 m)
horizontally
L= Clearance above paved sidewalk or paved Vent termination not allowed in this location 7 ft (2.1 m)
driveway located on public property for category IV appliances. See note 5
M= Clearance under veranda, porch, deck, See note 4 12 inches (30 cm)
or balcony See note 5
Notes:
1. In accordance with the currentANSI Z223.1 / NFPA 54 National Fuel Gas Code.
2. In accordance with the current CAN/CSA-B149 Installation Codes.
3. Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor.
4. For clearances not specied in ANSI Z223.1 / NFPA 54, clearance is in accordance with local installation codes and the
requirements of the gas supplier.
5. For clearances not specied in CAN/CSA-B149, clearance is in accordance with local installation codes and the requirements of the
gas supplier.
6. IMPORTANT: All terminals must be placed so that they remain a minimum 12” above expected snow line. Local codes may have
more specic requirements, and must be consulted.

MagnaTherm Boilers and Water Heaters
Page 13
to damage by accident or vandalism. It must be
at least 7 feet ( 2.1 m) above a public walkway.
3. Locate the combustion air terminal so that it
cannot be blocked by snow. The National Fuel
Gas Code requires that it be at least 12 inches
(30 cm) above grade, but the installer may
determine it should be higher, depending upon
local conditions.
4. If the MagnaTherm is side-wall vented to the
same wall, use Figure 4 to determine the proper
mounting locations.
5. Multiple vent kits should be installed such that
the horizontal distance between outlet group
and inlet group is 84” (213 cm). (See Figure 5)
6. The vent outlet must be at least 12” above the top
of the air inlet, and must be at least 84” (213 cm)
horizontally from the air inlet. (See Figure 5).
3.3.3 Vertical Vent Terminal
When the unit is vented through the roof, the vent
must extend at least 3 feet (0.9 m) above the point
at which it penetrates the roof. It must extend at
least 2 feet (0.6 m) higher than any portion of a
building within a horizontal distance of 10 feet (3.0
m), and high enough above the roof line to prevent
blockage from snow. The vent terminal offered with
the MagnaTherm can be used in both vertical and
horizontal applications. When the combustion air is
taken from the roof, the combustion air must terminate
at least 12” (30 cm) below the vent terminal.
84”
213
12”
Figure 4. Minimum Venting Distance
IMPORTANT: All terminals must be placed so that they remain at least 12”
above the expected snow line. Local codes may have more specic
requirements, and must be consulted. Refer to the NFPA54 National Fuel Gas
Code and your local codes for all required clearances for venting.
84
Figure 5. Multiple Side-Wall Terminals, Air and
Vent
Whenever possible, avoid locations under
windows or near doors.
5. Locate the vent terminal so that it cannot
be blocked by snow. The installer may
determine that a vent terminal must be
higher than the minimum shown in codes,
depending upon local conditions.
6. Locate the terminal so the vent exhaust does
not settle on building surfaces or other nearby
objects. Vent products may damage surfaces or
objects.
7. If the boiler or water heater uses ducted
combustion air from an intake terminal located
on the same wall, see See Figure 5 and Figure
4 for proper spacing and orientation.
3.3.2 Side Wall Combustion Air Terminal
Consider the following when installing the terminal.
1. Do not locate the air inlet terminal near a
source of corrosive chemical fumes (e.g.,
cleaning uid, chlorine compounds, etc.).
2. Locate the terminal so that it will not be subject

LAARS Heating Systems
Page 14
3.3.4 Vertical Combustion Air Terminal
When combustion air is taken from the roof, a eld-
supplied rain cap or an elbow arrangement must be
used to prevent entry of rain water. The opening on
the end of the terminal must be at least 12” (30 cm)
above the point at which it penetrates the roof, and
high enough above the roof line to prevent blockage
from snow. When the vent terminates on the roof, the
combustion air must terminate at least 12” (30 cm)
below the vent terminal.
3.3.5 Installations in the Commonwealth
of Massachusetts
In Massachusetts the following items are required
if the side-wall exhaust vent termination is less than
seven (7) feet above nished grade in the area of
the venting, including but not limited to decks and
porches. (From Massachusetts Rules and regulations
248 CMR 5.08.)
1. Installation of Carbon Monoxide Detectors
At the time of installation of the side wall vented
gas fueled appliance, the installing plumber or
gas-tter shall observe that a hard-wired carbon
monoxide detector with an alarm battery back-
up is installed on the oor level where the gas
appliance is to be installed. In addition, the
installing plumber or gastter shall observe
that a battery operated or hard-wired carbon
monoxide detector with an alarm is installed on
each additional level of the dwelling, building
or structure served by the side-wall horizontally
vented gas fueled equipment. It shall be the
responsibility of the property owner to secure
the services of qualied licensed professionals
for installation of hard-wired carbon monoxide
detectors.
a. In the event that the side-wall horizontally
vented gas fueled equipment is installed in a
crawl space or an attic, the hard-wired carbon
monoxide with alarm and battery back-up may
be installed on the next adjacent oor level.
b. In the event that the requirements of the
subdivision cannot be met at the time of
completion of installation, the owner shall have
a period of thirty (30) days to comply with the
above requirements, provided, however, that
during said thirty (30) day period, a battery
operated carbon monoxide detector with an
alarm be installed.
2. Approved Carbon Monoxide Detectors
Each carbon monoxide detector shall comply
with NFPA 720 and be ANSI/UL 2034 listed and
IAS certied.
3. Signage
A metal or plastic identication plate shall be
permanently mounted to the exterior of the
building at a minimum height of eight (8) feet
above grade directly in line with the exhaust
vent terminal for horizontally vented gas fueled
heating appliance or equipment. The sign shall
read, in print no less than one-half (1/2) inch in
size: “GAS VENT DIRECTLY BELOW, KEEP
CLEAR OF ALL OBSTRUCTIONS.”
4. Inspection
The state or local gas inspector of the side-
wall horizontally vented gas fueled appliance
shall not approve the installation unless, upon
inspection, the inspector observes carbon
monoxide detectors and signage installed in
accordance with the provisions of 248 CMR
5.08(2)(a) 1-4.
3.4 Common Vent Test
Note -This section does not describe a method
for common venting MagnaTherm’s. It describes
what must be done when a unit is removed from
a common vent system. MagnaTherm’s require
special vent systems and fans for common vent.
Contact the factory if you have questions about
common venting MagnaTherm’s.
Figure 6. Combustion Air and Vent Through Roof
*
*
*
*
*
*
* In Canada, refer to CAN/CSA B199.1

MagnaTherm Boilers and Water Heaters
Page 15
When an existing boiler is removed from a common
venting system, the common venting system is likely
to be too large for proper venting of the appliances
remaining connected to it.
At the time of removal of an existing boiler, the
following steps shall be followed with each appliance
remaining connected to the common venting system
placed in operation, while the other appliances
remaining connected to the common venting system are
not in operation.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper
size and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion or other
deciencies which could cause an unsafe condition.
3. Insofar as is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the common
venting system are located and other spaces of
the building. Turn on any clothes dryers and any
appliance not connected to the common venting
system. Turn on any exhaust fans, such as range
hoods and bathroom exhausts, so they will operate
at maximum speed. Do not operate a summer
exhaust fan. Close replace dampers.
4. Place in operation the appliance being inspected.
Follow the lighting instructions.Adjust thermostat
so appliance will operate continuously.
5. Test for spillage at the draft hood relief opening
after ve minutes of main burner operation. Use
the ame of a match or candle, or smoke from a
cigarette, cigar or pipe.
6. After it has been determined that each appliance
remaining connected to the common venting
system properly vents when tested as outlined
above, return the doors, windows, exhaust fans,
replace dampers and any other gas burning
appliance to their previous conditions of use.
7. Any improper operation of the common venting
system should be corrected so the installation
conforms with the National Fuel Gas Code,
ANSI Z223.1/NFPA54 and/or CAN/CSA
B149.1, National Gas and Propane Installation
Code. 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 appropriate tables in
Appendix F in the National Fuel Gas Code,ANSI
Z223.1 NFPA54 and/or CAN/CSAB149.1,
National Gas and Propane Installation Code.
Au moment du retrait d’une chaudiére existante, les
mesures suivantes doivent être prises pour chaque
appareil toujurs raccordé au systéme d’évacuation
commun et qui fonctionne alors que d’autres appareils
toujours raccordés au système d’évacuation ne
fonctionnent pas:
1. Sceller toutes les ouvertures non utilisées du système
d’évacuation.
2. Inspecter de facon visuelle le système d’évacuation
pour déterminer la grosseur et l’inclinaison
horizontale qui conviennent et s’assurer que le
système est exempt d’obstruction, d’étranglement,
de fuite, de corrosion et autres défaillances qui
pourraient présenter des risques.
3. Dans la mesure du possible, fermer toutes les portes
et les fenêtres du bâtiment et toutes les portes entre
l’espace où les appareils toujours raccordés au
système d’évacuation sont installés et les autres
espaces du bâtiment. Mettre en march les sécheuses,
tous les appareils non raccordés au système
d’évacuation commun et tous les ventilateurs
d’extraction comme les hottes de cuisinière et les
ventilateurs des salles de bain. S’assurer que ces
ventilateurs fonctionnent à la vitesse maximale. Ne
pas faire fonctionner les ventilateurs d’été. Fermer
les registres des cheminées.
4. Mettre l’appareil inspecté en marche. Suivre les
instructions d’allumage. Régler le thermostat de
facon que l’appareil fonctionne de facon continue.
5. Faire fonctionner le brûleur principal pendant 5
min ensuite, déterminer si le coup-tirage déborde à
l’ouverture de décharge. Utiliser la amme d’une
allumette ou d’une chandelle ou la fumée d’une
cigarette, d’un cigare ou d’une pipe.
6. Une fois qu’il a été détermineé, selon la méthode
indiquée ci-dessus, que chaque appareil raccordé
au système d’évacuation est mis à l’air libre de
facon adéquate. Remettre les portes et les fenêtres,
les vientilateurs, les registre de cheminées et les
appareils au gaz àleur position originale.
7, Tout mauvais fonctionnement du système
d’évacuation commun devrait être corrigé de facon
que l’installation soit conforme au National Fuel
Gas Code,ANSI Z223.1/NFPA 54 et (ou) aux codes
d’installation CAN/CSA-B149.1. Si la grosseur
d’une section du système d’évacuation doit être
modié pour respecter les valeurs minimales des
tableaux pertinents de l’appendice F du National
Fuel Gas Code,ANSI Z223.1/NFPA 54 et (ou) aux
codes d’installation CAN/CSA-B149.1.

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Page 16
WARNING
Do not use open ame to check for leaks. An
open ame could lead to explosion, which
could result in property damage, serious injury
or death.
Note - The MagnaTherm appliance and all
other gas appliances sharing the gas supply line
must be ring at maximum capacity to properly
measure the inlet supply pressure. The pressure
can be measured at the supply pressure port
on the gas valve. Low gas pressure could be an
indication of an undersized gas meter, undersized
gas supply lines and/or an obstructed gas supply
line. MagnaTherm units may be equipped with
low and high gas pressure switches that are
integrally vent limited. These types of devices do
not require venting to atmosphere.
Section 4
GAS SUPPLY AND PIPING
4.0 Gas Supply and Piping
Gas piping should be supported by suitable hangers
or oor stands, not the appliance. Installers should
refer to local building and safety codes or, in the
absence of such requirements, follow the National
Fuel Gas Code, ANSI Z223.1 NFPA and/or CSA
B149.1 installation codes.
Review the following instructions before proceeding
with the installation.
1. Verify that the appliance is tted for the
proper type of gas by checking the rating
plate. MagnaTherm appliances are normally
equipped to operate at elevations up to 2000
feet (610m).
However, the appliance will function properly
without the use of high altitude modication at
elevations up to 10,000 feet (3050 m).
2. The maximum inlet gas pressure must not
exceed 13” W.C. (3.2kPa). The minimum inlet
gas pressure is 4” W.C. (1.0kPa).
3. Table 8 and Table 9 offer some gas pipe sizing
information. Refer to the applicable gas code
for more detailed sizing information.
4. Run gas supply line in accordance with all
applicable codes.
5. Locate and install manual shutoff valves in
accordance with state and local requirements.
6. A sediment trap must be provided upstream of
the gas controls.
7. All threaded joints should be coated with
piping compound resistant to action of
liqueed petroleum gas.
8. The appliance and its individual shutoff valve
must be disconnected from the gas supply
piping during any pressure testing of that
system at test pressures in excess of 1/2 PSIG
(3.45kpa).
9. The unit must be isolated from the gas supply
system by closing its individual manual shutoff
valve during any pressure testing of the gas
supply piping system at test pressures equal to
or less than 1/2 PSIG (3.45kpa).
10. The appliance and its gas connection must be
leak tested before placing it in operation.
11. Purge all air from gas lines
3.5 Outdoor Installation
If installing outdoors in a location that may experience
freezing temperatures, precautions must be taken to
prevent water in the heat exchanger and condensate
inside and outside of the boiler from freezing. Damage
due to freezing water or condensate is not covered by the
warranty.
For proper operation in outdoor installations,
the boiler must be equipped with the inlet air and
exhaust terminal kits listed in Table 7. Additional
Table 7. Air & Vent accessories for Units Placed Outdoors
(Place in section 3.1)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Screen for horizontal galvanized air pipe D2012104 D2012101 D2012101 D2012102 D2012103 D2012103
Screen for horizontal PVC air pipe CA012004 CA012001 CA012001 CA012002 CA012003 CA012003
Screen for horizontal polypropylene air pipe CA012204 CA012201 CA012201 CA012202 CA012203 CA012203
Screen for vertical galvanized air pipe D2012204 D2012201 D2012201 D2012202 D2012203 D2012203
Screen for vertical PVC air pipe CA012404 CA012401 CA012401 CA012402 CA012403 CA012403
Screen for vertical polypropylene air pipe CA012604 CA012601 CA012601 CA012602 CA012603 CA012603
Table 3a - Ducted Air Accessories
(Place in section 3.2)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Horizontal vent terminal for stainless steel D2012004 D2012001 D2012001 D2012002 D2012003 D2012003
Screen for horizontal CPVC vent CA012104 CA012101 CA012101 CA012102 CA012103 CA012103
Screen for vertical stainless steel vent D2012304 D2012301 D2012301 D2012302 D2012303 D2012303
Screen for vertical CPVC vent CA012504 CA012501 CA012501 CA012502 CA012503 CA012503
Table 3* - Vent Accessories
(Place in section 3.5)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Air intake screen for unit placed outdoors CA0011904 CA011901 CA011901 CA011902 CA0011903 CA0011903
Vent terminal for unit placed outdoors CA011803 CA011801 CA011801 CA011802 CA011803 CA011803
Table 3** - Air & Vent Accessories for Units Placed Outdoors