LAARS MagnaTherm MGV Installation Manual

Installation and Operation Instructions Document 1276C

Installation and Operation Instructions for

MAGNATHERM

Modulating Boiler Water Heater

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

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.

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.

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.

H2359200C

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 - LOCA TING 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 T erminal .................................11

3.3.2 Side Wall Combustion Air Terminal ..............13

3.3.3 V ertical Vent T erminal ....................................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 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 W ater 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 W ater 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 Diagram .........................................32-33

8.6 High Voltage Wiring Diagrams .................34-36

8.7 Ladder Diagrams ......................................37-39

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

MagnaTherm Boilers and Water Heaters

Section 9 – NA VIGATING THE TOUCH SCREEN

9.1 The Touch Screen ..........................................40

9.2 Using the Touch Screen ..................................40

9.3 VericationProcessforSafety-Related

Parameters ......................................................42

9.4 While Operating - Checking Individual

Parameters ......................................................43

9.5 ConguringParametersonIndividual

Controllers ......................................................44

9.6 Setting the Date and Time on the

System Display......................45

9.7 CongurationMenus(ALL) ..........................46

9.7.1 SystemIdentication&Access ......................46

9.7.2 CH-CentralHeatConguration....................47

9.7.3 OutdoorResetConguration .........................47

9.7.4 DHW-DomesticHotWaterConguration ...47

9.7.5 WarmWeatherShutdownConguration ........47

9.7.6 DemandPriorityConguration ......................47

9.7.7 ModulationConguration ..............................47

9.7.8 PumpConguration .......................................47

9.7.9 StatisticsConguration ..................................48

9.7.10 High Limits ....................................................48

9.7.11 Stack Limits ....................................................48

9.7.12 Delta T Limits.................................................48

9.7.13 FrostProtectionConguration .......................48

9.7.14 Burner Control Ignition ..................................50

9.7.15 SystemConguration .....................................50

9.7.16 SensorConguration ......................................50

9.7.17 LeadLagSlaveConguration ........................50

9.7.18 LeadLagMasterConguration .....................53

9.8 Parameter Defaults and Ranges ......................53

9.9 Connections to a

Building Automation System .........................57

9.10 Vari-Prime Flow Control System ...................58

9.11 Combustion Setup Procedure .........................59

Section 10 - INITIAL STARTUP INSTRUCTIONS

10.1 Filling the Boiler System ................................62

10.2 Initial Operation .............................................63

10.2.1 Initial Burner Operation .................................63

10.2.2 Combustion Setup Procedure .........................63

10.3 Shutting Down the MagnaTherm ...................63

10.4 Restarting the MagnaTherm ...........................63

Section 11 – MAINTENANCE

11.1 System Maintenance.......................................64

11.2 Maintenance Notes .........................................64

11.2.1 Burner .............................................................64

11.2.2 Modulating Gas Valve/ Venturi ......................64

11.2.3 Controller .......................................................65

11.2.4 Hot Surface Ignitor .........................................65

11.2.5 Flame Sensor ..................................................65

11.2.6 Blower ............................................................65

11.2.7 Heat Exchanger T ubes ....................................66

11.2.8 Gas Pressure Switches ....................................66

Section 12 – TROUBLESHOOTING

12.1 About Lockouts, Holds, and Alerts ................67

12.1.1 Responding to a Lockout, Hold,

or Alert ............................................................67

12.1.2 Viewing the Lockout and Alert

Histories .........................................................67

12.2 Troubleshooting Table ...............................69-83

12.3 Diagnostic Tests and Input/Output

Indicators ........................................................83

12.4 Lead/Lag Slave Diagnostics ...........................84

12.5 Statistics .........................................................84

12.6 Analysis ..........................................................84

12.7 Control Snapshot ............................................85

12.8 Operating Sequence ........................................85

Section 13 – REPLACEMENT PARTS

13.1 General Information .......................................86

13.2 Component Illustrations, Parts Lists,

and Part Numbers ......................................86-99

13.2.1 Frame and Jacket Assembly ...........................87

13.2.2 Final Assembly ...............................................89

13.2.3 Blower Assembly, Model 2000 ......................90

13.2.4 Blower Assembly, Model 2500 ......................91

13.2.5 Blower Assembly, Model 3000 ......................92

13.2.6 Blower Assembly, Model 4000 ......................93

13.2.7 GasTrainAssembly,Models2000&3000 ....94

13.2.8 Gas Train Assembly, Model 2500 ..................96

13.2.9 Gas Train Assembly, Model 4000 ..................97

13.2.10 Waterway Outlet Assembly ...........................98

13.2.11 Control Panel Assembly ..............................100

LAARS Heating Systems

MagnaTherm Boilers and Water Heaters

Section 1 GENERAL INFORMATION

1.1 Introduction

is manual includes information which will help you to install, operate, and maintain the Magnaerm 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

Page 1

Touch Screen

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.

Open the

front panel

to access

the Touch

Screen

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/NFPA54Latest 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.

Page 2

LAARS Heating Systems

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

2000 2500 3000 3500 4000

FUEL

N - NATURAL P - PROPANE

COUNTRY

CODE

X - USA/ CANADA E - EXPORT

Not CSA approved

OPTIONS CODE

X -

STANDARD

J - CSD-1

ELEC SYSTEM

A - 110V, 1Ø B - 220V, 1Ø C - 208V, 3Ø D - 480V, 3Ø E - 600V, 3Ø

ASME

X - “H” STAMP (MGH) W - “HLW” STAMP (MGV)

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 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

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.

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.

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.

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.

REVISION

1 -FIRST

MagnaTherm Boilers and Water Heaters

1.5 Unit Overviews

The next 3 pages give a visual reference to

the basic component locations of the LAARS MagnaTherm.

Page 3

Blower

Manual gas valve

Touch Screen

Heat Exchanger

Power Pack

Model 2000

Perspective from front left corner. Shown with front doors and left side

panels removed

Condensing Unit

Air Intake and

Filter

Water Outlet

Water Inlet

Vent

Condensate

Trap

Perspective from opposite corner.

Page 4

Blower

Manual gas valve

Touch Screen

Heat Exchanger

LAARS Heating Systems

Power Pack

Condensing Unit

Air Intake and

Filter

Water Outlet

Water Inlet

Models 2500 and 3000

Vent

Condensate

Trap

MagnaTherm Boilers and Water Heaters

Page 5

Blower

Manual gas valve (hidden behind main

gas valve)

Touch Screen

Heat Exchanger

Condensing Unit

Power Pack

Models 3500 and 4000

Air Intake and

Filter

Water Outlet

Water Inlet

Vent

Condensate

Trap

Page 6

VIEW

REAR

FRONT

VIEW

SIDE

VIEW

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

Gas

Air Inlet

Model 4000

The Model 4000 varies from other sizes in the locaon of it’s Air Inlet and Gas Supply.

VIEWREAR

J K L M N P Q R S T U

Inches (cm) Inches (cm) Inches (cm)

29.3 (75) 79 (201) 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)

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)

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)

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 )

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)

A B C D E F G H J K L M N P Q R S T U

Inches (cm) Inches (cm) Inches (cm)

29.3 (75) 79 (201) 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)

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 )

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)

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 )

S T U

Vent Ø

18.3 (46) 14.8 (38) 6 (15) 8 (20) 8 (20) 71.0 (180)

18.3 (46) 14.8 (38) 6 (15) 10 (25) 10 (25) 71.0 (180)

10 (25) 10 (25)

A B C D E F G H J K L M N P Q R S T U

Inches (cm) Inches (cm) Inches (cm)

29.3 (75) 79 (201) 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)

30.8 (78)

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 )

4000

Vent Ø

Air Inlet Ø

10 (25) 10 (25)

80.8 (205)

Water Gas

Condensate

Connection Connection Line

3" Groove L ock

(or flange)

2" NPT 1"

3" Groove L ock

(or flange)

2" NPT 1"

3" Groove L ock

(or flange)

2" NPT 1"

4" Groove L ock

(or flange)

2" NPT 1"

4" Groove L ock

(or flange)

2" NPT 1"

1.6 Dimensions

Model

2000 2500 30.8 (78) 3000 30.8 (78) 3500 4000

A B C D E F G H

34.5 (88) 97 (246) 52 (133) 70 (178) 60.8 (154 ) 6.4 (16) 80.8 (205) 28.8 (73)

87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16) 71 (180) 4 (10) 87 (221) 41.5 (105) 60.5 (154) 60.8 (154) 6.5 (16) 71 (180) 4 (10)

LAARS Heating Systems

Model

2000 2500 3000 3500 4000

Model

2000 2500 3000 3500

Models 3500 and 4000 differ from the other sizes in the location of their Air Inlet and Gas Supply.

J K L M N P Q R

9.8 (25) 76.4 (194) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30)

8.9 (23) 76.8 (195) 4.3 (11) 44.4 (113) 34.5 (88) 17.7 (45) 27.2 (69) 11.8 (30)

'Knock-

down'

Height

Models 3500 / 4000

Figure 1. Dimensions

MagnaTherm Boilers and Water Heaters

Page 7

1.7 Unpacking

The MagnaTherm is shipped in a single crate. Remove all packing and tie-down materials.

Section 2 LOCA TING 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 T able 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.

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 SERVICE ACCESS CLEARANCE SURFACE INCHES CM

Front 24 61 Left Side 8 20 Right Side 8 20 Back 24 61 Top, 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 4 15 Right Side 4 15 Back 11 15 Top 1 2.5 Vent 1 2.5

Table 1. Clearances

INTAKE / EXHAUST

MAX EQUIVALENT SIZE DIAMETER FT. M

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

Page 8

(Place in section 3.1)

Screen for horizontal galvanized air pipe D2012101 D2012101 D2012102 D2012103 D2012103

Screen for horizontal PVC air pipe CA012001 CA012001 CA012002 CA012003 CA012003

Screen for horizontal polypropylene air pipe CA012201 CA012201 CA012202 CA012203 CA012203

Screen for vertical galvanized air pipe D2012201 D2012201 D2012202 D2012203 D2012203

Screen for vertical PVC air pipe CA012401 CA012401 CA012402 CA012403 CA012403

Screen for vertical polypropylene air pipe CA012601 CA012601 CA012602 CA012603 CA012603

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

LAARS Heating Systems

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 1 square 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

Table 3. Ducted Air Accessories

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

Table 4. Required Combustion Air Pipe Material

Model 2000 Model 2500 Model 3000 Model 3500 Model 4000

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.

MagnaTherm Boilers and Water Heaters

with the outdoors and shall have a minimum free area of 1 square 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)

Page 9

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/NFPA 54, 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.

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.

Page 10

(Place in section 3.1)

Model 2000 Model 2500 Model 3000 Model 3500 Model 4000

Screen for horizontal galvanized air pipe D2012101 D2012101 D2012102 D2012103 D2012103

Screen for horizontal PVC air pipe CA012001 CA012001 CA012002 CA012003 CA012003

Screen for horizontal polypropylene air pipe CA012201 CA012201 CA012202 CA012203 CA012203

Screen for vertical galvanized air pipe D2012201 D2012201 D2012202 D2012203 D2012203

Screen for vertical PVC air pipe CA012401 CA012401 CA012402 CA012403 CA012403

Screen for vertical polypropylene air pipe CA012601 CA012601 CA012602 CA012603 CA012603

Table 3a - Ducted Air Accessories

(Place in section 3.2)

Model 2000 Model 2500 Model 3000 Model 3500 Model 4000

Horizontal vent terminal for stainless steel D2012001 D2012001 D2012002 D2012003 D2012003

Screen for horizontal CPVC vent CA012101 CA012101 CA012102 CA012103 CA012103

Screen for vertical stainless steel vent D2012301 D2012301 D2012302 D2012303 D2012303

Screen for vertical CPVC vent CA012501 CA012501 CA012502 CA012503 CA012503

LAARS Heating Systems

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.

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. 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

Table 5. Vent Accessories

Material United States Canada

Stainless steel UL 1738 Venting must be ULC S636 certied for use as

CPVC, sch 40 ANSI/ASTM F441

Polypropylene

Pending APPROV AL

Table 6. Required Exhaust Vent Material

Installation Standards

venting material. The venting material class must be chosen based upon the intended application of the boiler, and must be installed according to

ULC S636 Class 2C

the maximum ue gas temperature and the vent

manufacturer’s instructions.

MagnaTherm Boilers and Water Heaters

Category IV appliances. Per the requirements of 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.

Page 11

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

Figure 2. Test Port

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

Page 12

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 current ANSI 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.

LAARS Heating Systems

Figure 3. Combustion Air and Vent Through Side Wall

*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)

MagnaTherm Boilers and Water Heaters

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.

Figure 5. Multiple Side-Wall Terminals, Air and

Vent

cannot enter the building through doors, windows, gravity inlets or other openings. 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.

Page 13

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 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.

If the vent termination is located in an area exposed to high winds, an optional PVC tee (the same diameter as the vent pipe) may be used. The tee’d vent termination offers greater protection from wind related operating issues.

Figure 4. Minimum Venting Distance

12”

84”

213

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.

LAARS Heating Systems

In Canada, refer to CAN/CSA B199.1

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.

Figure 6. Combustion Air and Vent Through Roof

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.

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/NFPA 54 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 NFPA 54 and/or CAN/CSA B149.1, 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.

Page 16

(Place in section 3.1)

Model 2000 Model 2500 Model 3000 Model 3500 Model 4000

Screen for horizontal galvanized air pipe D2012101 D2012101 D2012102 D2012103 D2012103

Screen for horizontal PVC air pipe CA012001 CA012001 CA012002 CA012003 CA012003

Screen for horizontal polypropylene air pipe CA012201 CA012201 CA012202 CA012203 CA012203

Screen for vertical galvanized air pipe D2012201 D2012201 D2012202 D2012203 D2012203

Screen for vertical PVC air pipe CA012401 CA012401 CA012402 CA012403 CA012403

Screen for vertical polypropylene air pipe CA012601 CA012601 CA012602 CA012603 CA012603

Table 3a - Ducted Air Accessories

(Place in section 3.2)

Model 2000 Model 2500 Model 3000 Model 3500 Model 4000

Horizontal vent terminal for stainless steel D2012001 D2012001 D2012002 D2012003 D2012003

Screen for horizontal CPVC vent CA012101 CA012101 CA012102 CA012103 CA012103

Screen for vertical stainless steel vent D2012301 D2012301 D2012302 D2012303 D2012303

Screen for vertical CPVC vent CA012501 CA012501 CA012502 CA012503 CA012503

Table 3* - Vent Accessories

(Place in section 3.5)

Air intake screen for unit placed outdoors CA011901 CA011901 CA011902 CA0011903 CA0011903

Vent terminal for unit placed outdoors CA011801 CA011801 CA011802 CA011803 CA011803

Table 7. Air & Vent accessories for Units Placed Outdoors

Model 2000 Model 2500 Model 3000 Model 3500 Model 4000

LAARS Heating Systems

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 instructions are supplied with the terminal kits.

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

MagnaTherm Boilers and Water Heaters

Nominal: 1½ 2 2½ 3 4 Actual ID: 1.61 2.067 2.469 3.068 4.026

Length (ft)

10 3,520 6,790 10,800 19,100 39,000 20 2,420 4,660 7,430 13,100 26,800 30 1,940 3,750 5,970 10,600 21,500 40 1,660 3,210 5,110 9,030 18,400 50 1,480 2,840 4,530 8,000 16,300 60 1,340 2,570 4,100 7,250 14,800

80 1,230 2,370 3,770 6,670 13,600 100 1,140 2,200 3,510 6,210 124,700 125 1,070 2,070 3,290 5,820 11,900 150 1,010 1,950 3,110 5,500 11,200 175 899 1,730 2,760 4,880 9,950 200 814 1,570 2,500 4,420 9,010 250 749 1,440 2,300 4,060 8,290 300 697 1,340 2,140 3,780 7,710 350 618 1,190 1,900 3,350 6,840 400 560 1,080 1,720 3,040 6,190

Notes:

1. Inlet pressure - 11.0 in w.c.

Capacity in Cubic Feet of Gas per Hour

Pipe Size (in.)

Natural Gas

Undiluted Propane

Pipe Size (in.)

Capacity in Cubic Feet of Gas per Hour

Nominal: 2 2½ 3 4 5 Nominal: 1½ 2 2½ 3 4 Actual ID: 2.067 2.469 3.068 4.026 5.047 Actual ID: 1.61 2.067 2.469 3.068 4.026 Length (ft) Length (ft)

10 4,020 6,400 11,300 23,100 41,800 10 3,520 6,790 10,800 19,100 39,000 20 2,760 4,400 7,780 15,900 28,700 20 2,420 4,660 7,430 13,100 26,800 30 2,220 3,530 6,250 12,700 23,000 30 1,940 3,750 5,970 10,600 21,500 40 1,900 3,020 5,350 10,900 19,700 40 1,660 3,210 5,110 9,030 18,400 50 1,680 2,680 4,740 9,660 17,500 50 1,480 2,840 4,530 8,000 16,300 60 1,520 2,430 4,290 8,760 15,800 60 1,340 2,570 4,100 7,250 14,800 70 1,400 2,230 3,950 8,050 14,600 80 1,230 2,370 3,770 6,670 13,600 80 1,300 2,080 3,670 7,490 13,600 100 1,140 2,200 3,510 6,210 124,700

90 1,220 1,950 3,450 7,030 12,700 125 1,070 2,070 3,290 5,820 11,900 100 1,160 1,840 3,260 6,640 12,000 150 1,010 1,950 3,110 5,500 11,200 125 1,020 1,630 2,890 5,890 10,600 175 899 1,730 2,760 4,880 9,950 150 928 1,480 2,610 5,330 9,650 200 814 1,570 2,500 4,420 9,010 175 854 1,360 2,410 4,910 8,880 250 749 1,440 2,300 4,060 8,290 200 794 1,270 2,240 4,560 8,260 300 697 1,340 2,140 3,780 7,710 150 704 1,120 1,980 4,050 7,320 350 618 1,190 1,900 3,350 6,840 300 638 1,020 1,800 3,670 6,630 400 560 1,080 1,720 3,040 6,190 350 587 935 1,650 3,370 6,100 Notes: 400 546 870 1,540 3,140 5,680 1. Inlet pressure - 11.0 in w.c.

Notes: 2. Pressure drop - 0.5 in w.c.

3. Specific gravity - 1.50

4. Schedule 40 metallic pipe

5. Intended use - Pipe sizing between single- or second-stage

4. Schedule 40 metallic pipe (low pressure) regulator and appliance.

Capacity in Cubic Feet of Gas per Hour

Pipe Size (in.)

Natural Gas

Undiluted Propane

Pipe Size (in.)

Capacity in Cubic Feet of Gas per Hour

Undiluted Propane

Pipe Size (in.)

Capacity in Cubic Feet of Gas per Hour

Undiluted Propane

Pipe Size (in.)

Capacity in Cubic Feet of Gas per Hour

The following are gas line sizing examples from the

National Fuel Gas Code. Size your gas lines properly, based on your installation, and all applicable codes.

SCH 40 METAL PIPE CAPACITY FOR 0.60 SPECIFIC GRAVITY

NATURAL GAS

NOMINAL PIPE SIZE @ 0.30” W.C. PRESSURE DROP

Nominal: 2 2½ 3 4 5 Actual ID: 2.067 2.469 3.068 4.026 5.047

Length (ft)

10 4,020 6,400 11,300 23,100 41,800 20 2,760 4,400 7,780 15,900 28,700 30 2,220 3,530 6,250 12,700 23,000 40 1,900 3,020 5,350 10,900 19,700 50 1,680 2,680 4,740 9,660 17,500 60 1,520 2,430 4,290 8,760 15,800 70 1,400 2,230 3,950 8,050 14,600

80 1,300 2,080 3,670 7,490 13,600

90 1,220 1,950 3,450 7,030 12,700 100 1,160 1,840 3,260 6,640 12,000 125 1,020 1,630 2,890 5,890 10,600 150 928 1,480 2,610 5,330 9,650 175 854 1,360 2,410 4,910 8,880 200 794 1,270 2,240 4,560 8,260 150 704 1,120 1,980 4,050 7,320 300 638 1,020 1,800 3,670 6,630 350 587 935 1,650 3,370 6,100 400 546 870 1,540 3,140 5,680

Table 8. Pipe Capacity for Natural Gas

Page 17

1. Inlet pressure - Less than 2 psi

2. Pressure drop - 0.5 in w.c.

3. Specific gravity - 0.60

SCHED 40 METAL PIPE CAPACITY FOR 1.50 SPECIFIC GRAVITY

UNDILUTED PROPANE

NOMINAL PIPE SIZE @ 11” W.C. INLET AND 0.5” W.C. PRESSURE

DROP

Nominal: 1½ 2 2½ 3 4 Actual ID: 1.61 2.067 2.469 3.068 4.026

Length (ft)

10 3,520 6,790 10,800 19,100 39,000

20 2,420 4,660 7,430 13,100 26,800

30 1,940 3,750 5,970 10,600 21,500 40 1,660 3,210 5,110 9,030 18,400 50 1,480 2,840 4,530 8,000 16,300 60 1,340 2,570 4,100 7,250 14,800

Table 9. Pipe Capacity for Propane

Page 18

Gas Pipe

Boiler Thermal

Efficiency

Water Heater Thermal

Efficiency

Water

Content

Vent

Diameter

Vent

Length

Water Heater

Thermal Efficiency

MBH kW %

2000 1999 586 96 2500 2499 732 96 3000 3000 879 95

4000 4000 1172 96

Size

SizeSize

Output Rate

Input Rate

14°C

17°C

19°C

22°C

Dimensional Data Sizing Data

Water Pipe

Gas Pipe

Boiler Thermal

Efficiency

Water Heater Thermal

Efficiency

Water

Content

Vent

Diameter

Vent

Length

Inches cm Inches cm Inches cm Inches cm (NPT) (NPT) MBH kW MBH kW % % lbs kg lbs kg lbs kg Gallons in (cm) ft (m)

2000 29.3 75 77 196 38.0 97 57.0 145 2.5 1.5 2000 1999 586 1883 552 95.0 96 1390 630 1562 709 1590 721 22 8 (20) 100 (30.5) 2500 29.3 75 77 196 38.0 97 57.0 145 2.5 1.5 2500 2499 732 2374 696 95.0 96 1785 810 2039 925 1985 900 31 8 (20) 100 (30.5) 3000 30.8 78 87 221 41.5 105 60.5 154 3 2 3000 3000 879 2814 825 95.0 95 1785 810 2039 925 1985 900 31 10 (25) 100 (30.5) 3500 30.8 78 87 221 41.5 105 60.5 154 3 2 3500 3500 1025 3317 972 95.0 96 2278 1033 2742 1244 2478 1124 56 10 (25) 100 (30.5) 4000

34.5 88 97 246 52.0 132 70.0 178 4 2.5 4000 4000 1172 3724 1091 95.0 96 2278 1033 2742 1244 2478 1124 56 12 (30) 100 (30.5)

Water Heater

Thermal Efficiency

Boiler Water Flow Requirements

Size

Flow

Head Loss

Flow

Head Loss

Flow

Head Loss

Flow

Head Loss

Flow

Head Loss

GPM Feet GPM Feet GPM Feet GPM Feet LPM m LPM m LPM m LPM m

2000 150 30 128 23.5 109 17.1 95 13.6 2000 568 9.2 485 7.2 413 5.2 360 4.2 2500 190 34 158 23.6 136 17.6 119 13.6 2500 719 10.0 599 7.0 514 5.0 449 4.1 3000 226 47 190 34.2 164 25.8 142 18.9 3000 856 14.3 719 10.4 621 7.9 538 5.8 3500 266 41 222 30.6 190 23.6 166 18.6 3500 1007 12.0 839 9.0 719 7.0 629 6.0 4000 300 48 255 38.2 218 28.5 190 22.5 4000 1136 14.6 965 11.6 825 8.7 719 6.9

Size

A B C D

Temperature Rise in °C

30°F

Temperature Rise in °F

25°F

35°F

40°F

14°C

17°C

19°C

22°C

Water Flow Requirements (for water heater submittal)

Model Flow Rate Temp Rise Headloss Flow Rate Temp Rise Headloss Flow Rate Temp Rise Headloss Flow Rate Temp Rise Headloss

GPM °F Ft LPM °C m GPM °F Ft LPM °C m

2000 152 25 33.0 575 14 10.1 177 21 43.9 670 12 13.4 2500 190 25 33.7 719 13.9 10.0 220 21 46.0 833 11.7 14 3000 190 30 36.0 719 17 11.0 220 26 46.0 833 14 14 3500 222 30 30.6 839 17 9.0 266 25 40.6 1007 14 12 4000 224 34 30.0 848 19 9.1 266 29 41.2 1007 16 12.6

Allowable pH: 6.5 to 9.5

Headloss is for the heater only (no piping)

Water Hardness

1-10 grains per gallon

Water Hardness

11-15 grains per gallon

Water Hardness

11-15 grains per gallon

Water Flow Requirements (for water heater submittal)

Model Flow Rate Temp Rise Headloss Flow Rate Temp Rise Headloss Flow Rate Temp Rise Headloss Flow Rate Temp Rise Headloss

GPM °F Ft LPM °C m GPM °F Ft LPM °C m

Water Hardness

1-10 grains per gallon

Water Hardness

11-15 grains per gallon

Section 5 WATER FLOW REQUIREMENTS

5.1 MagnaTherm Boiler Flow and Head Requirements

LAARS Heating Systems

Headloss is for boiler only (no piping)

Flow Head Loss Flow Head Loss Flow Head Loss Flow Head Loss

LPM m LPM m LPM m LPM m

2000 568 9.2 485 7.2 413 5.2 360 4.2 2500 719 10.0 599 7.0 514 5.0 449 4.1 3000 856 14.3 719 10.4 621 7.9 538 5.8 3500 1007 12.0 839 9.0 719 7.0 629 6.0 4000 1136 14.6 965 11.6 825 8.7 719 6.9

Table 10. Boiler Flow and Head Requirements

5.2 MagnaTherm Water Heater Flow and Head Requirements

* * *

Table 11. Water Heater Flow and Head Requirements

MagnaTherm Boilers and Water Heaters

Section 6 WATER CONNECTIONS MGH BOILERS

6.1 MGH System Piping: Hot Supply Connections

Note -This appliance must be installed in a closed

pressure system with a minimum of 12 psi (82.7 kPa) static pressure at the boiler.

Page 19

A boiler installed above radiation level, or as required by the authority having jurisdiction, must be provided with a low water cutoff device either as a part of the boiler or at the time of boiler installation.

6.3 MGH Freeze Protection

The hot water piping should be supported by

suitable hangers or oor stands. Do not support the

piping with this appliance. The hangers used should allow for expansion and contraction of pipe. Rigid hangers may transmit noise through the system resulting from the piping sliding in the hangers. We recommend that padding be used when rigid hangers are installed. Maintain 1” (2.5 cm) clearance to combustibles for all hot water pipes.

Pipe the discharge of the relief valve (full size) to a drain or in a manner to prevent injury in the event of pressure relief. Install an air purger, an air vent, an

expansion tank, a hydronic ow check valve in the

system supply loop, and any other devices required

by local codes. The minimum ll pressure must

be 12 psig (82.7 kPa). Install shutoff valves where required by code.

Suggested piping diagrams are shown in Figure 7 through Figure 10. These diagrams are meant only as guides. Components required by local codes must be properly installed.

The MagnaTherm’s efciency is higher with

lower return water temperatures. Therefore, to get the best low return temperature with multiple boilers, pipe as shown in Figure 9 and Figure 10.

6.2 MGH Cold Water Make-Up

1. Connect the cold water supply to the inlet

connection of an automatic ll valve.

2. Install a suitable back ow preventer between the automatic ll valve and the cold water

supply.

3. Install shut off valves where required.

In some installations, a hot water heating boiler is connected to heating coils located in an air handling appliance where the coils may be exposed to refrigerated air circulation. In these cases, the boiler

piping system must be equipped with ow control

valves or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle.

MagnaTherm units 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 .

If installed indoors, and there is an event such as a power outage, interruption of gas supply, failure of system components, activation of safety devices,

etc., this may prevent a boiler from ring. Any time a boiler is subjected to freezing conditions, and

the boiler is not able to re, and/or the water is

not able to circulate, there is a risk of freezing in the boiler or in the pipes in the system. When

water freezes, it expands. This may result in bursting of pipes, or damage to the boiler, and this could result in leaking or ooding conditions.

Do not use automotive antifreeze. To help prevent freezing, LAARS recommends the use of inhibited glycol concentrations between 20% and 35% glycol. Typically, this concentration will serve as burst protection for temperatures down to approximately

-5°F (-20°C). If temperatures are expected to be lower than -5°F (-20°C), glycol concentrations up to 50% can be used. When concentrations greater

than 35% are used, water ow rates must be

increased to maintain a 20°F to 25°F temperature rise through the boiler.

WARNING

Glycol must not be used in domestic hot water applications. Refer to Section 7 for instructions on freeze protection for MGV units (domestic hot water).

Page 20

LAARS Heating Systems

Different glycol products may provide varying degrees of protection. Glycol products must be maintained properly in a heating system, or they may become ineffective. Consult the glycol

specications, or the glycol manufacturer, for information about specic products, maintenance

of solutions, and set up according to your particular conditions.

The following manufacturers offer glycols, inhibitors, and anti foamants that are suitable for use in the MagnaTherm. Please refer to the manufacturers instructions for proper selection and application.

• Sentinel Performance Solutions Group

• Hercules Chemical Company

• Dow Chemical Company The boiler control offers some assistance with freeze

protection, as long as the boiler is energized, and

able to re.

1. If the outlet sensor detects less than 45°F, the

control energizes the boiler pump.

2. If the outlet sensor detects less than 35°F, the

control will re at low rate.

3. Once in freeze protect mode, the boiler will remain in that state until the outlet sensor detects greater than 50°F.

The condensate drain must be installed to prevent the accumulation of condensate. When a condensate pump is not used, the tubing must continuously slope downward toward the drain with no spiraling.

Consult local codes for the disposal method.

Caution

Condensate is mildly acidic (pH=5), and

may harm some oor drains and/or pipes,

particularly those that are metal. Ensure that the drain, drainpipe, and anything that will come in contact with the condensate can withstand the acidity, or neutralize the condensate before disposal. Damage

caused by failure to install a neutralizer kit or to adequately treat condensate will not be the manufacturer’s responsibility.

6.4 MGH Suggested Piping Schematics

Figure 7 through Figure 10 show suggested piping

congurations for MGH boilers. These diagrams

are only meant as guides. All components or piping required by local code must be installed.

6.5 Condensate Drain Trap

A condensate drain trap is included with the MagnaTherm and is designed to drain the boiler of condensate. The vent condensate should be drained through a drain tee located in the vent line. This will help prevent excessive condensate from entering the boiler condensate trap.

Connect a 3/4” PVC pipe between the drain

connection and a oor drain (or condensate pump if a oor drain is not accessible).

MagnaTherm Boilers and Water Heaters

Space heating zone circuits

Space heating zone circuit

Page 21

Low temp. radiant zone

Air vent

Water feed controls

4 pipe dia. max.

System pump

4 pipe dia. max. 4 pipe dia. max. 4 pipe dia. max.

Note This drawing is a schematic representation of a piping style, and is not intended to be used as a working installation drawing. Local code requirements must be met.

Figure 7. Hydronic Piping — Single Boiler, Multiple Temperature Zones

Zoning with circulators

Page 22

Note This drawing is a schematic representation of a piping style, and is not intended to be used as a working installation drawing. Local code requirements must be met.

LAARS Heating Systems

Air vent

Expansion tank

4 pipe dia. max.

Low temp. radiant zone

Water feed controls

Indirect DHW tank

Low temp. radiant zone

Anti-scald mixing valve

Domestic hot water out

Cold water

Figure 8. Hydronic Piping — Single Boiler with Low Temperature Zones and Indirect DHW Tank

Indirect tank directly off of boiler

MagnaTherm Boilers and Water Heaters

Page 23

Note This drawing is a schematic representation of a piping style, and is not intended to be used as a working installation drawing. Local code requirements must be met.

Space heating zone circuit

Air vent

Water feed controls

Expansion tank

4 pipe dia. max.

Space heating zone circuits

Low temp. radiant zone

4 pipe dia. max. 4 pipe dia. max.

Common piping must be sized for the combined water ow of all of the boilers.

Figure 9. Hydronic Piping — Multiple Boilers, Multiple Temperature Zones, Reverse Return.

Zoning with circulators

Page 24

Space heating zone circuit

Air vent

Space heating zone circuits

High temp. space heating zone circuit

LAARS Heating Systems

Water feed controls

Expansion tank

4 pipe dia. max.

Common piping must be sized for the combined water ow of all the boilers.

Note This drawing is a schematic representation of a piping style, and is not intended to be used as a working installation drawing. Local code requirements must be met.

4 pipe dia. max. 4 pipe dia. max.

Note Indirect pump must be sized for boiler and indirect

Indirect DHW tank

Anti-scald mixing valve

Domestic hot water out

Cold water

Note In this piping arrangement, the boiler pump must turn o during DHW operation.

Figure 10. Hydronic Piping — Multiple Boilers, Indirect DHW Off of One Boiler

MagnaTherm Boilers and Water Heaters

Section 7 WATER CONNECTIONS MGV UNITS

7.1 MGV Water Quality

MGV water heaters must be installed in water conditions of 15 gpg hardness or less, with a pH range of 6.5 to 9.5 pH. Values outside of this range may reduce the life expectancy of the product. Operating the MGV in water with higher hardness levels will cause heat exchanger fouling, erosion, or corrosion, leading to premature component

failure, reduced efciency, heat exchanger failure

or system failure. Failure of this type will not be warranted. If the water in use exceeds the conditions recommended, water softeners or other devices should be installed to improve water quality.

Page 25

7.2 MGV Suggested Piping Schematics

Figure 11 through Figure 13 show suggested piping

congurations for MGV boilers. These diagrams

are only meant as guides. All components or piping required by local code must be installed.

7.3 MGV Piping Requirements

The water piping should be supported by suitable

hangers and oor stands. Do not support the piping

with this appliance. The hangers used should allow for expansion and contraction of copper pipe. Rigid hangers may transmit noise through the system resulting from piping sliding in the hangers. We recommend that padding be used when rigid hangers are installed. Maintain 1” (2.5 cm) clearance to combustibles for hot water pipes.

Pipe the discharge of the relief valve (full size) to the drain or in a manner to prevent injury in the

NOTE: This drawing shows

Location of pump

TPRV

NOTES:

1. Locate MGV DHW sensor or remote aquastat well in lower 1/3 of tank.

2. Back ow preventer may be required - check local codes.

3. Thermal expansion tank may be required - check local codes.

4. Caution: Pump sizing must be based upon water hardness at job site.

5. If the tank does not have a tapping for the cold water supply, the supply may be run to the pipe between the tank and boiler inlet.

suggested piping conguration and

valving. Check with local codes and ordinances for additional requirements.

Supply

Building return

Expansion tank

Cold water supply

Figure 11. DHW Piping - One Heater, One Vertical Tank

Page 26

LAARS Heating Systems

event of pressure relief. Install a diaphragm-type

expansion tank, ow check, and shutoff valves

where needed or as required by code. The piping should be installed so that each pump

supplies ow only to the heater to which it is

attached.

7.4 MGV Cold Water Make-Up

The cold water make-up may be connected to the tank as shown in Figure 11 through Figure 13. If the tank does not have a tapping for the cold water supply, the supply may be run to the pipe

between the tank and boiler inlet. Install back-ow

preventers and shut-offs where needed or required by code.

Cold water supply

7.5 MGV Freeze Protection

If installed indoors, and there is an event such as a power outage, component failure or other issue when freezing is likely, the heater and system must be drained to avoid the risk of damage due to freezing. Glycol must not be used in volume water heating applications.

NOTES:

1. Locate the MGV DHW sensor or remote aquastat well in lower 1/3 of tank.

2. Back ow preventer may be required - check local

codes.

3. Thermal expansion tank may be required check local codes.

4. Caution: Pump sizing must be based upon water

Building return

hardness at job site.

5. If the tank does not have a tapping for the cold water supply, the supply may be run to the pipe between the tank and boiler inlet.

Pump

Supply

Expansion tank

TPRV

Ball valve (typical)

TPRV

Figure 12. DHW Piping - One Heater, Two Vertical Tanks

NOTE: This drawing shows

suggested piping conguration and

valving. Check with local codes and ordinances for additional requirements.

+ 74 hidden pages

LAARS MagnaTherm MGV Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

1.1 Introduction

1.2 Safety Notes

1.4 Warranty

1.6 Dimensions

1.7 Unpacking

2.1 Locating the Appliance

2.2 Correct Vent Distance from Outside Wall or Roof Termination

3.1 Combustion Air

3.1.1 Combustion Air From Room

3.1.2 Ducted Combustion Air

3.2 Venting

3.2.1 Common Venting

3.2.3 Venting Requirements Unique to Canada

3.3 Locating the Vent and Combustion Air Terminals

3.3.1 Side Wall Vent Terminal

Figure 3. Combustion Air and Vent Through Side Wall

3.3.2 Side Wall Combustion Air Terminal

3.3.3 Vertical Vent Terminal

3.3.4 Vertical Combustion Air Terminal

3.3.5 Installations in the Commonwealth of Massachusetts

3.4 Common Vent Test

3.5 Outdoor Installation

4.0 Gas Supply and Piping

5.1 MagnaTherm Boiler Flow and Head Requirements

5.2 MagnaTherm Water Heater Flow and Head Requirements

6.1 MGH System Piping: Hot Supply Connections

6.3 MGH Freeze Protection

6.2 MGH Cold Water Make-Up

6.4 MGH Suggested Piping Schematics

6.5 Condensate Drain Trap

7.1 MGV Water Quality

7.2 MGV Suggested Piping Schematics

7.3 MGV Piping Requirements

7.4 MGV Cold Water Make-Up

7.5 MGV Freeze Protection