Laars MFTCF140 User manual

Installation and Operation Instructions Document 1320B
H2373000B
WARNING
If the information in this manual is not
followed exactly, a re or explosion may
result causing property damage, personal
injury or loss of life.
Do not store or use gasoline or other
ammable vapors and liquids in the vicinity of
this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
nearby 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.
Installation and Operation
Instructions for
MASCOT ® FT
Floor-Standing, Modulating
Gas, Condensing, Combination Boiler
Model MFTCF
140,000 BTU/hr
199,000 BTU/hr
• Natural Gas (NG) - Factory Conguration
• Propane Gas (LP) - Field-Convertible

LAARS Heating Systems
TABLE OF CONTENTS
SECTION 1
Product Accessories
1.1 Introduction ........................................................... 1
1.2 Included with the Appliance ................................1-2
SECTION 2
Product Characteristics
2.1 Model Nomenclature ............................................. 3
2.2 Specications ........................................................ 4
2.3 Dimensions ........................................................... 6
2.4 Names of Components ......................................... 8
2.5 Product Flow and Characteristics ....................... 10
2.5.1 Central Heating Flow ..................................10
2.5.2 Domestic Hot Water Flow........................... 11
SECTION 3
Safety Regulations
3.1 Safety Symbols ................................................... 12
3.2 Safety Precautions and Proper Use .................... 14
SECTION 4
Installation
4.1 Location and Clearances .....................................16
4.2 Wall Mount Bracket ..............................................17
4.2.1 Installation Height and Location .................17
4.2.2 Hang the Boiler ..........................................17
4.3 Combustion Air .....................................................18
4.3.1 Combustion Air from Room ........................18
4.3.2 Ducted Combustion Air ..............................18
4.4 Venting (exhaust) .................................................20
4.5 General Location Guidelines ................................21
4.6 Locations for Vent Pipe Terminator ......................23
4.6.1 Direct Venting Clearances ..........................23
4.6.2 Non-Direct Venting Clearances ..................24
4.6.3 Venting Requirements in Massachusetts ...25
4.7 Air Supply and Vent Connections at the Appliance .26
4.7.1 Vent / Air Pipe Lengths ...............................26
4.7.2 Direct Venting .............................................26
4.7.3 Indoor Combustion Air ................................27
4.8 Vent / Air Pipe Termination ...................................27
4.9 Gas Supply and Piping .........................................29
4.10 Gas Supply Pressure ..........................................32
4.11 Gas Set Up and Adjustment ................................32
4.12 High Altitude Installations and Orices ................33
4.13 Natural Gas to Propane Conversion ...................34
4.14 Plumbing Guideline .............................................38
4.15 Pressure Relief Valves ........................................42
4.16 Disposal of Condensate ......................................43
4.17 Electrical Wiring Connections ........................... 44
4.18 DIP Switches .................................................... 45
4.19 Control Board, Electrical Diagram ..................... 47
4.20 Ladder Diagram ................................................ 48
4.21 Electrical Connections ...................................... 49
SECTION 5
Control Display and Operation
5.1 Control Dial and Buttons ......................................50
5.2 LCD Overview ......................................................51
5.3 Operating Mode ................................................. 52
5.4 Status Display Mode ......................................... 53
5.5 DHW Set Point Change Mode ........................... 54
5.6 CH Set Point Change Mode .............................. 55
5.7 Storage Mode .................................................... 55
5.8 Installer Mode .................................................... 56
5.9 Outside Temperature (option) ............................ 58
5.10 External Set Point Temperature Control ............ 58
5.11 Error Mode ........................................................ 59
SECTION 6
Error Codes
6.1 Error Codes ....................................................... 60
6.2 Fault Tree Analysis ............................................ 63
SECTION 7
Trouble Shooting
7.1 Diagnostics ........................................................ 65
7.2 Suggested Corrective Actions ........................... 67
SECTION 8
Maintenance
8.1 Annual Startup and General Maintenance ........ 68
8.2 Flushing or Draining .......................................... 70
SECTION 9
Installation Check
9.1 Quick View ........................................................ 71
9.2 Final Check Lists ............................................... 72
SECTION 10
Repair Part Diagrams
10.1 Parts List and Illustrations ............................ 74-85

Mascot FT Floor Standing Combination Boiler Page 1
SECTION 1
Product Accessories
1.1 Introduction
This manual provides information necessary for the
installation, operation, and maintenance of the LAARS
Heating Systems Mascot FT. All application and installation
procedures must be read and reviewed completely before
proceeding with the installation. Consult the LAARS Heating
Systems factory, or your local factory representative, with any
problems or questions regarding this equipment. Experience
has shown that most operating problems are caused by
improper installation.
All installations must be made in accordance with
1) American National Standard Z223.1/NFPA54-Latest
Edition “National Fuel Gas Code” or
2) CSAB149.1 “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.
All electrical wiring is to be done in accordance with the local
codes, or in the absence of local codes, with: 1) The National
Electrical Code ANSI/NFPA No. 70-latest Edition, or 2) CSA
STD. C22.1 “Canadian Electrical Code - Part 1”. This appliance
must be electrically grounded in accordance with these codes.
1.2 Included with the Appliance
MFTCF140 MFTCF199
Item Description Qty
LAARS Floor-Standing,
Combination Boiler
MFTCF140 or MFTCF199 1
LP Conversion Kit.
This kit includes the new LP orice and
the gas conversion instructions. 1
Installation Instructions and
User’s Manual 1 Each
Spare Parts Kit
(Gaskets and O-Rings) 1
Condensate Hose 1
This boiler was converted on ____/____/____/ to____ gas
organization making this conversion, who accepts the
« Cette chaudière a été convertie le (annéemoisjour) ____ pour
with Kit No._________ by _________ ( name and address of
responsibility for the correctness of this coversion)."
fonctionner au gaz ____ à l’aide de la trousse n° par (nom et
adresse de l’organisme qui a effectué la conversion), qui
a effectué la conversion), qui accepte l’entière
responsabilité de la qualité de la conversion. »
WARNING
This conversion shall be installed by a quali ed service
agencyin accordance with the manufacturer's instructions
andall applicable codes and requirements of the authority
havingjurisdiction. Ifthe information in these instructions
is not followed exactly, a  re, an explosion or production
ofcarbon monoxide may result causing property damage,
personal injury or loss of life. The quali ed service agency is
responsiblefor the proper and complete installation of this kit.
Theinstallation is not proper and complete until the operation
of the converted appliance is checked as speci ed in the
manufacturer'sinstruction supplied with the kit.
AVERTISSEMENT
Ceconversion doit être installé par un organisme de service
conformémentaux instructions du fabricant et tous les
codeset les exigences de l’autorité compétente. Si les
informationscontenues dans ces instructions n’est pas suivi
àla lettre, un incendie, une explosion ou de la production de
monoxydede carbone mais résultat causant des dommages
matériels,des blessures ou des pertes de vie. Le service est
responsablepour la bonne et complète l’installation de ce kit.
L’installationn’est pas correcte et complète jusqu’à ce que
le fonctionnement de l’appareil converti est véri ée comme
spéci é dans le manuel d’instruction fourni avec le kit.
CustomerService and Product Support: 800.900.9276 • Fax [phone]
Headquarters:20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax [phone]
1869Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax [phone]
www.Laars.com Lithoin U.S.A. © Laars Heating Systems 1607 Document 4290A
800.900.9276•Fax [phone](CustomerService, Service Advisors)
20Industrial Way,Rochester, NH03867 •603.335.6300 •Fax [phone] (ApplicationsEngineering)
1869Sismet Road,Mississauga,Ontario, CanadaL4W 1W8•905.238.0100 •Fax[phone]
www.Laars.com
Document 4290A
M ascot FT Floor-Standing Gas Conversion Kit
pg1 of 4
The Laars Mascot FT condensing gas boiler is con gured for
NaturalGas (NG) from the factory. Ifyour gas supply is Propane
Gas(LP), your boiler can be converted to burn propane gas. Also,
if your boiler is already converted to burn propane, it can be modi ed
backto burning Natural Gas, using these instructions.
NOTICE
TheNatural Gas to Propane Conversion Kit (# R20771) included with the Mascot FT,is intended
onlyf or altitudes less than 3000 ft. If your installation altitude is greater than 3000 ft, then please
referto Section 4.12 of the Installation Manual (Doc 1320)
TheKit is supplied in a bag attached to the combination boiler. If your Mascot FT does not have the
bagcontaining the conversion kit, a replacement kit can be obtained. Contact the manufacturer at
theaddress below and request a replacement conversion kit.
WARNING
This conversion kit shall be installed by a quali ed service
agencyin accordance with the manufacturer’s instructions and
allapplicable codes and requirements of the authority having
jurisdiction.The information in these instructions must be
followed to minimize the risk of  re or explosion or to prevent
property damage, personal injury or death. The quali ed service
agencyis responsible for the proper installation of this kit. The
installationis not proper and complete until the operation of the
converted appliance is checked as speci ed in the manufacturer’s
instructionssupplied with the kit.
Installationmust conform to local codes and the latest edition
ofthe National Fuel Gas Code, ANSI Z223.1 and CAN-B149.1.
Failureto follow instructions could result in serious injury or
propertydamage.
The quali ed agency performing this work assumes
responsibility for gas conversion.
CAUTION
Thiscombination boiler has already been set to burn natural
gas,but can be converted to burn LP gas. Before placing the
combinationboiler into operation, verify that your fuel source
isnatural gas. Or verify that your fuel source is propane if you
areconverting this combination unit to propane.
Kit # R20771 H2373900A TopAccess Panel
FrontPanel Knob
FrontPanel
FigureA
ON/ OFF
Toconvert from Natural Gas to Propane Gas
1.
TurnOFF the Mascot FT. The ON / OFF button
islocated at the bottom left of the Control Display.
2. TurnOFF the GAS and WATER supply to the
MascotFT (valves are located on the plumbing pipes.)
TableA
.18
NaturalGas
(NG)Part # Propane Gas (LP)Part #
MFTCF140 FT1722 FT1722P
MFTCF199 FT1780 FT1802
Nozzle
Orice
WARNING
This conversion shall be installed by a quali ed service
agencyin accordance with the manufacturer's instructions
andall applicable codes and requirements of the authority
havingjurisdiction. Ifthe information in these instructions
is not followed exactly, a  re, an explosion or production
ofcarbon monoxide may result causing property damage,
personal injury or loss of life. The quali ed service agency is
responsiblefor the proper and complete installation of this kit.
Theinstallation is not proper and complete until the operation
of the converted appliance is checked as speci ed in the
manufacturer'sinstruction supplied with the kit.
AVERTISSEMENT
Ceconversion doit être installé par un organisme de service
conformémentaux instructions du fabricant et tous les
codeset les exigences de l’autorité compétente. Si les
informationscontenues dans ces instructions n’est pas suivi
àla lettre, un incendie, une explosion ou de la production de
monoxydede carbone mais résultat causant des dommages
matériels,des blessures ou des pertes de vie. Le service est
responsablepour la bonne et complète l’installation de ce kit.
L’installationn’est pas correcte et complète jusqu’à ce que
le fonctionnement de l’appareil converti est véri ée comme
spéci é dans le manuel d’instruction fourni avec le kit.
CustomerService and Product Support: 800.900.9276 • Fax [phone]
Headquarters:20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax [phone]
1869Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax [phone]
www.Laars.com Lithoin U.S.A. © Laars Heating Systems 1607 Document 4290A
800.900.9276•Fax [phone](CustomerService, Service Advisors)
20Industrial Way,Rochester, NH03867 •603.335.6300 •Fax [phone] (ApplicationsEngineering)
1869Sismet Road,Mississauga,Ontario, CanadaL4W 1W8•905.238.0100 •Fax[phone]
www.Laars.com
Document 4290A
M ascot FT Floor-Standing Gas Conversion Kit
pg1 of 4
The Laars Mascot FT condensing gas boiler is con gured for
NaturalGas (NG) from the factory. Ifyour gas supply is Propane
Gas(LP), your boiler can be converted to burn propane gas. Also,
if your boiler is already converted to burn propane, it can be modi ed
backto burning Natural Gas, using these instructions.
NOTICE
TheNatural Gas to Propane Conversion Kit (# R20771) included with the Mascot FT,is intended
onlyf or altitudes less than 3000 ft. If your installation altitude is greater than 3000 ft, then please
referto Section 4.12 of the Installation Manual (Doc 1320)
TheKit is supplied in a bag attached to the combination boiler. If your Mascot FT does not have the
bagcontaining the conversion kit, a replacement kit can be obtained. Contact the manufacturer at
theaddress below and request a replacement conversion kit.
WARNING
This conversion kit shall be installed by a quali ed service
agencyin accordance with the manufacturer’s instructions and
allapplicable codes and requirements of the authority having
jurisdiction.The information in these instructions must be
followed to minimize the risk of  re or explosion or to prevent
property damage, personal injury or death. The quali ed service
agencyis responsible for the proper installation of this kit. The
installationis not proper and complete until the operation of the
converted appliance is checked as speci ed in the manufacturer’s
instructionssupplied with the kit.
Installationmust conform to local codes and the latest edition
ofthe National Fuel Gas Code, ANSI Z223.1 and CAN-B149.1.
Failureto follow instructions could result in serious injury or
propertydamage.
The quali ed agency performing this work assumes
responsibility for gas conversion.
CAUTION
Thiscombination boiler has already been set to burn natural
gas,but can be converted to burn LP gas. Before placing the
combinationboiler into operation, verify that your fuel source
isnatural gas. Or verify that your fuel source is propane if you
areconverting this combination unit to propane.
Kit # R20771 H2373900A TopAccess Panel
FrontPanel Knob
FrontPanel
FigureA
ON/ OFF
Toconvert from Natural Gas to Propane Gas
1.
TurnOFF the Mascot FT. The ON / OFF button
islocated at the bottom left of the Control Display.
2. TurnOFF the GAS and WATER supply to the
MascotFT (valves are located on the plumbing pipes.)
TableA
.18
NaturalGas
(NG)Part # Propane Gas (LP)Part #
MFTCF140 FT1722 FT1722P
MFTCF199 FT1780 FT1802
Nozzle
Orice
This water heater applied to the ____ gas.
Gas conversion date : ____ / ____ / ____
Converted by the technicians :
_________________________________
(Ce chauffe-eau appliquee au gaz ____.)
(Date de conversion de gaz :)
(Converti par les techniciens:)

LAARS Heating Systems
Page 2
1.2 Included with the Appliance (continued)
Items Descriptions Qty
Mesh screen
(3
" mesh)
2
Outdoor Sensor with
Screws and Anchors 1
Pressure Relief Valve
(CH LINE 3/4″ 30psi)
Model : CASH ACME F-82 1

Mascot FT Floor Standing Combination Boiler Page 3
Figure 1. Model Nomenclature
2 3 4 5 6 7 8 9 10 11 12 13
F T C F A 1 X N
SERIES
Mascot FT C - Combi SIZE
MBTU/h
140
199
FUEL
N - Natural
P - Propane
CONFIG
F - Floor Stnd ALTITUDE
A - 0 -10,000 Feet REVISION
1 - First OPTIONS X - Standard PUMP
N - with Pump
1
M
SECTION 2.
Product Characteristics
2.1 Model Nomenclature
The Model Nomenclature is shown on your Rating Plate and consists of a series of letters and numbers
( Nomenclature ) that further identies the characteristics of your Mascot FT.

LAARS Heating Systems
Page 4
2.2 Specications
Model Name MFTCF140
Gas Input Rate MAX 140,000 Btu/h
MIN 28,000 Btu/h
Hot Water Capacity
35
°F Rise 7.1 Gal
45
°F Rise 5.5 Gal
77
°F Rise 3.2 Gal
Installation Indoor / Floor stand type
Flue System Sealed Combustion Direct / Single / Concentric Vent/ SideWall Vent
Vent Run 2"(50ft) , 3"(100ft) Schedule 40 CPVC, PP
Gas Supply Pressure NG 3.5" WC to 10.5" WC
LP 8.0" WC to 13" WC
Manifold Pressure
Gas Type LP NG
Vent size 2" VENT 3" VENT 2" VENT 3" VENT
MFTCF140 Min re
-0.15 " WC -0.216 " WC -0.15 " WC -0.216 " WC
Low re 0.1 " WC 0.079 " WC 0 " WC 0.002 " WC
Power Supply Main Supply 120V 60Hz / 6A
Maximum Power
Consumption 160W
Ignition System Direct Electronic Ignition / Automatic Flame Sensing
Burner System Single Orice Premixed Fuel Modulation Ceramic Infrared
Gas Valve System Combination modulating (Current proportional)
Minimum Flow Rate 0 .5GPM
Dimensions W15.7" - H52.4" – D26.7"
Weight 150 lbs
Sub Heat Exchanger Water Capacity(DHW) Under 15 Gallon
Main Controller / Control Panel GTX-920CP / P-920C
Water Pressure Min 15 ~ Max 150 PSI
Connection Sizes
Cold Water Inlet / Hot
Water Outlet 3/4" NPT
Space Heating
Supply / Return 1" NPT
Gas Inlet 3/4" NPT
Materials Casing Cold Rolled Carbon Steel
Heat Exchanger Primary Heat Exchanger : Stainless Steel
Sub Heat Exchanger : Stainless Steel
Safety Devices
Flame Rod, Overheat Cut Off Device, Gas Valve Operation
Detector, Exhaust Temperature High Limit Switch, Water
Temperature High Limit Switch
Customer Service and Product Support: 800.900.9276 • Fax [phone]
Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax [phone]
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax [phone]
www.Laars.com Litho in U.S.A. © Laars Heating Systems 1607 Document 4290A
800.900.9276•Fax[phone] (Customer Service, ServiceAdvisors)
20 Industrial Way,Rochester,NH 03867 •603.335.6300 •Fax [phone] (Applications Engineering)
1869SismetRoad, Mississauga, Ontario,Canada L4W 1W8 •905.238.0100 •Fax [phone]
www.Laars.com
Document 4290A
M ascot FT Floor-Standing Gas Conversion Kit
pg 3 of 4
Manifold pressure
‘NG’ type combustibility ‘LP’ type combustibility
2" VENT 3" VENT 2" VENT 3" VENT
MFTCF140 MAX Fire -0.15
"
WC -0.216
"
WC -0.15
"
WC -0.216
"
WC
MIN Fire 0 ”
WC 0.002
”
WC 0.1
”
WC 0.079
”
WC
MFTCF199 MAX Fire -0.134
”
WC -0.173
”
WC
MIN Fire -0.015 ”
WC -0.015
”
WC
Figure D
15.
Setup your combustion analyser and place the sensor
into the combustion test port
16.
Per Table B for Max Fire
,
change dip switch 6 to ON and 7 to OFF.
The unit will cycle up to MAX  re.
17.
WAIT for your combustion analyser to stabilize. This may take up to 3 minutes depending on your combustion
analyser. Then check the CO2 measurement for MAX  re. Refer to Table D for acceptable MAX  re
combustion readings. At this point, just record the CO2readings at MAX Fire. Do NOT attempt to adjust
CO2at MAX Fire. ONLY in MIN Fire, so...
18.
Per Table B for MIN Fire
,
change dip switch 6 to OFF and 7 to ON. The unit will cycle down to MIN Fire.
19.
WAIT for your combustion analyser to stabilize. Then check the CO2 measurement at MIN  re. Refer to
Table D for acceptable MIN  re combustion readings.
20.
If CO2 readings in Max Fire and MIN  re are acceptable, then skip ahead to Step 23. If not, then open the
Gas Valve Adjustment Port by removing the cap screw with a 4mm Allen wrench. See Figure E.
21.
Then use the 4 mm Allen wrench to make a minor adjustment (1/8 turn) to either increase or decrease CO2.
Table B DIP Switch Settings
MBH N/A 140 N/A 199
ON OFF
MIN Fire Normal Operation
MAX Fire Normal Operation
NG Natural LP Propane
3” Vent Size 2” Vent Size
ON OFF ON ON
ON OFF OFF ON
OFF ON ON ON
DO
NOT
CHANGE
REFERENCE
ONLY.
CO
2
value
‘NG’ type combustibility ‘LP’ type combustibility
2" VENT 3" VENT 2" VENT 3" VENT
MFTCF140 MAX Fire 8.5~10.5% 9.5~11 %
MIN Fire 8~10% 9~10.5 %
MFTCF199 MAX Fire 8.5~10.0% 9.5~11 %
MIN Fire 8~10% 9~10.5 %
Table C
Table D

Mascot FT Floor Standing Combination Boiler Page 5
Model Name MFTCF199
Gas Input Rate MAX 199,000 Btu/h
MIN 19,900 Btu/h
Hot Water Capacity
35
°F Rise 9.88 Gal
45
°F Rise 7.7 Gal
77
°F Rise 4.8 Gal
Installation Indoor / Floor stand type
Flue System Sealed Combustion Direct / Single / Concentric Vent/ SideWall Vent
Vent Run 2"(50ft) , 3"(100ft) Schedule 40 CPVC, PP
Gas Supply Pressure NG 3.5" WC to 10.5" WC
LP 8.0" WC to 13" WC
Manifold Pressure
Gas Type LP NG
Vent size 2" VENT 3" VENT 2" VENT 3" VENT
MFTCF140 Min re
-0.15 " WC -0.216 " WC -0.15 " WC -0.216 " WC
Low re 0.1 " WC 0.079 " WC 0 " WC 0.002 " WC
Power Supply Main Supply 120V 60Hz / 6A
Maximum Power
Consumption 160W
Ignition System Direct Electronic Ignition / Automatic Flame Sensing
Burner System Single Orice Premixed Fuel Modulation Ceramic Infrared
Gas Valve System Combination modulating (Current proportional)
Minimum Flow Rate 0 .5GPM
Dimensions W15.7” - H53.7” – D26.7”
Weight 180 lbs
Sub Heat Exchanger Water Capacity(DHW) Under 15 Gallon
Main Controller / Control Panel GTX-920CP / P-920C
Water Pressure Min 15 ~ Max 150 PSI
Connection Sizes
Cold Water Inlet / Hot
Water Outlet 3/4" NPT
Space Heating
Supply / Return 1" NPT
Gas Inlet 3/4" NPT
Materials Casing Cold Rolled Carbon Steel
Heat Exchanger Primary Heat Exchanger : Stainless Steel
Sub Heat Exchanger : Stainless Steel
Safety Devices
Flame Rod, Overheat Cut Off Device, Gas Valve Operation
Detector, Exhaust Temperature High Limit Switch, Water
Temperature High Limit Switch
Customer Service and Product Support: 800.900.9276 • Fax [phone]
Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax [phone]
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax [phone]
www.Laars.com Litho in U.S.A. © Laars Heating Systems 1607 Document 4290A
800.900.9276•Fax[phone] (Customer Service, ServiceAdvisors)
20 Industrial Way,Rochester,NH 03867 •603.335.6300 •Fax [phone] (Applications Engineering)
1869SismetRoad, Mississauga, Ontario,Canada L4W 1W8 •905.238.0100 •Fax [phone]
www.Laars.com
Document 4290A
M ascot FT Floor-Standing Gas Conversion Kit
pg 3 of 4
Manifold pressure ‘NG’ type combustibility ‘LP’ type combustibility
2" VENT 3" VENT 2" VENT 3" VENT
MFTCF140 MAX Fire
-0.15
"
WC -0.216
"
WC -0.15
"
WC -0.216
"
WC
MIN Fire
0
”
WC 0.002
”
WC 0.1
”
WC 0.079
”
WC
MFTCF199 MAX Fire
-0.134
”
WC -0.173
”
WC
MIN Fire
-0.015
”
WC -0.015
”
WC
Figure D
15. Setup your combustion analyser and place the sensor
into the combustion test port
16.
Per Table B for Max Fire, change dip switch 6 to ON and 7 to OFF.
The unit will cycle up to MAX  re.
17.
WAIT for your combustion analyser to stabilize. This may take up to 3 minutes depending on your combustion
analyser. Then check the CO2 measurement for MAX  re. Refer to Table D for acceptable MAX  re
combustion readings. At this point, just record the CO2readings at MAX Fire. Do NOT attempt to adjust
CO2at MAX Fire. ONLY in MIN Fire, so...
18.
Per Table B for MIN Fire, change dip switch 6 to OFF and 7 to ON. The unit will cycle down to MIN Fire.
19.
WAIT for your combustion analyser to stabilize. Then check the CO2 measurement at MIN  re. Refer to
Table D for acceptable MIN  re combustion readings.
20.
If CO2 readings in Max Fire and MIN  re are acceptable, then skip ahead to Step 23. If not, then open the
Gas Valve Adjustment Port by removing the cap screw with a 4mm Allen wrench. See Figure E.
21.
Then use the 4 mm Allen wrench to make a minor adjustment (1/8 turn) to either increase or decrease CO2.
Table B DIP Switch Settings
MBH N/A 140 N/A 199
ON OFF
MIN Fire Normal Operation
MAX Fire Normal Operation
NG Natural LP Propane
3” Vent Size 2” Vent Size
ON OFF ON ON
ON OFF OFF ON
OFF ON ON ON
DO
NOT
CHANGE
REFERENCE
ONLY.
CO2value ‘NG’ type combustibility ‘LP’ type combustibility
2" VENT 3" VENT 2" VENT 3" VENT
MFTCF140 MAX Fire 8.5~10.5% 9.5~11 %
MIN Fire 8~10% 9~10.5 %
MFTCF199 MAX Fire 8.5~10.0% 9.5~11 %
MIN Fire 8~10% 9~10.5 %
Table C
Table D
Customer Service and Product Support: 800.900.9276 • Fax [phone]
Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax [phone]
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax [phone]
www.Laars.com Litho in U.S.A. © Laars Heating Systems 1607 Document 4290A
800.900.9276•Fax [phone] (Customer Service, ServiceAdvisors)
20 Industrial Way, Rochester,NH 03867 •603.335.6300 •Fax [phone] (Applications Engineering)
1869Sismet Road,Mississauga,Ontario,Canada L4W1W8•905.238.0100 •Fax[phone]
www.Laars.com
Document 4290A
M ascot FT Floor-Standing Gas Conversion Kit
pg 3 of 4
Manifold pressure ‘NG’ type combustibility ‘LP’ type combustibility
2" VENT 3" VENT 2" VENT 3" VENT
MFTCF140 MAX Fire
-0.15
"
WC -0.216
"
WC -0.15
"
WC -0.216
"
WC
MIN Fire
0
”
WC 0.002
”
WC 0.1
”
WC 0.079
”
WC
MFTCF199 MAX Fire
-0.134
”
WC -0.173
”
WC
MIN Fire
-0.015
”
WC -0.015
”
WC
Figure D
15.
Setup your combustion analyser and place the sensor
into the combustion test port
16.
Per Table B for Max Fire, change dip switch 6 to ON and 7 to OFF.
The unit will cycle up to MAX  re.
17.
WAIT for your combustion analyser to stabilize. This may take up to 3 minutes depending on your combustion
analyser. Then check the CO2 measurement for MAX  re. Refer to Table D for acceptable MAX  re
combustion readings. At this point, just record the CO2readings at MAX Fire. Do NOT attempt to adjust
CO2at MAX Fire. ONLY in MIN Fire, so...
18.
Per Table B for MIN Fire, change dip switch 6 to OFF and 7 to ON. The unit will cycle down to MIN Fire.
19.
WAIT for your combustion analyser to stabilize. Then check the CO2 measurement at MIN  re. Refer to
Table D for acceptable MIN  re combustion readings.
20.
If CO2 readings in Max Fire and MIN  re are acceptable, then skip ahead to Step 23. If not, then open the
Gas Valve Adjustment Port by removing the cap screw with a 4mm Allen wrench. See Figure E.
21.
Then use the 4 mm Allen wrench to make a minor adjustment (1/8 turn) to either increase or decrease CO2.
Table B DIP Switch Settings
MBH N/A 140 N/A 199
ON OFF
MIN Fire Normal Operation
MAX Fire Normal Operation
NG Natural LP Propane
3” Vent Size 2” Vent Size
ON OFF ON ON
ON OFF OFF ON
OFF ON ON ON
DO
NOT
CHANGE
REFERENCE
ONLY.
CO2value ‘NG’ type combustibility ‘LP’ type combustibility
2" VENT 3" VENT 2" VENT 3" VENT
MFTCF140 MAX Fire 8.5~10.5% 9.5~11 %
MIN Fire 8~10% 9~10.5 %
MFTCF199 MAX Fire 8.5~10.0% 9.5~11 %
MIN Fire 8~10% 9~10.5 %
Table C
Table D
Note; The greatest installation difference between the MFTCF140 and MFTCF199, other than general output capability
(BTU’s), is that the air inlet and exhaust vents are opposite. See Section 2.4

LAARS Heating Systems
Page 6
2.3 Dimensions
Description Diameter
AGas Connection Adapter 3/4" NPT
B ‘CH supply’ Connection Adapter 1" NPT
C ‘CH return’ Connection Adapter 1" NPT
D ‘DHW outlet’ Connection Adapter 3/4" NPT
E ‘DHW inlet’ Connection Adapter 3/4" NPT
FCondensate Adapter 1/2" NPT
GDrain Adapter 1/2" NPT
52.4" 133 cm
15.7" 40 cm
3.3" 8 cm
9.2" 23 cm
68 cm
9.3"
2.7"
4.3"
4.3"
5.8"
9.2"
3.7"
12.9"
18.7"
23"
27.3"
30"
39.3"
3.0" 7.6 cm
20.5"
23.3"
26.7"
19.7"
A
B
C
D
E
F
G
TOP
SIDEFRONT
3” O EXHAUST VENT
GAS CONNECTION
HYDRONIC SUPPLY
HYDRONIC RETURN
DHW
CONDENSATE
DRAIN ADAPTER
OUTLET
INLET
DHW
3” O AIR INLET
MFTCF140

Mascot FT Floor Standing Combination Boiler Page 7
Description Diameter
AGas Connection Adapter 3/4" NPT
B ‘CH supply’ Connection Adapter 1" NPT
C ‘CH return’ Connection Adapter 1" NPT
D ‘DHW outlet’ Connection Adapter 3/4" NPT
E ‘DHW inlet’ Connection Adapter 3/4" NPT
FCondensate Adapter 1/2" NPT
GDrain Adapter 1/2" NPT
MFTCF199
53.7" 137 cm
15.7" 40 cm
4.0" 10.4 cm
6.6" 16.9 cm
68 cm
18.9"
2.6"
4.3"
4.3"
5.7"
8.8"
3.7"
12.5"
18.2"
22.5"
26.8"
29.4"
48.3"
17.9"
23.3"
26.7"
19.7"
3.0" 7.6 cm
5.0" 13 cm
A
B
C
D
E
F
G
TOP
SIDEFRONT
3” O EXHAUST VENT
GAS CONNECTION
HYDRONIC SUPPLY
HYDRONIC RETURN
DHW
CONDENSATE
DRAIN ADAPTER
OUTLET
INLET
DHW
3” O AIR INLET
Note; The greatest installation difference between the
MFTCF140 and MFTCF199, other than general output
capability (BTU’s), is that the air inlet and exhaust vent
are opposite. See Section 2.4

LAARS Heating Systems
Page 8
2.4 Names of Components
NO Name of Component
1
Exhaust Vent
2
Air Pressure Sensor
3
Blower
4
PCB Bracket
5
Flame Detection Sensor
6
Sight Glass
7
Manual Switch
8
Display Control
9
Exhaust Pipe
10
Recirculation Pump (CH)
11
Mixing Valve
12
Recirculation Pump (DHW)
13
DHW Tank Assembly
14
Water Drain Valve
15
Water Drain Adapter
16
Condensate Trap Adapter
NO Name of Component
17
Condensate Drain Hose
18
DHW Inlet Adapter
19
Condensate Trap
20
DHW Outlet Adapter
21
Condensate Heat Exchanger Hose
22
CH Return Connection
23
Air Pressure Switch
24
CH Supply Connection
25
Heat Exchanger
26
Gas Inlet Connection
27
Gas Valve
28
Air Vent (air eliminator)
29
Ignition Transformer
30
Igniter
31
Air Intake Pipe
32
Air Inlet
MFTCF140

Mascot FT Floor Standing Combination Boiler Page 9
NO Name of Component
1
Air Inlet
2
Air Pressure Sensor
3
Blower
4
PCB Bracket
5
Sight Glass
6
Flame Detection Window
7
Manual Switch
8
Display Control
9
Air Intake Pipe
10
Recirculation Pump (CH)
11
Mixing Valve
12
Recirculation Pump (DHW)
13
DHW Tank Assembly
14
Water Discharge Valve
15
Water Discharge Adapter
16
Condensate Trap Adapter
NO Name of Component
17
Condensate Drain Hose
18
DHW Inlet Adapter
19
Condensate Trap
20
DHW Outlet Adapter
21
Condensate Heat Exchanger Hose
22
CH Return Connection
23
CH Supply Connection
24
Air Pressure Switch
25
Heat Exchanger
26
Igniter
27
Gas Valve
28
Ignition Transformer
29
Gas Inlet Connection
30
Air Vent (air eliminator)
31
Exhaust Pipe
32
Exhaust Vent
MFTCF199
Note; The greatest installation
difference between the
MFTCF140 and MFTCF199,
other than general output
capability (BTU’s), is that the
air inlet and exhaust vent are
opposite.

LAARS Heating Systems
Page 10
2.5.1 Central Heating ow. Combination Boiler Heating Mode.
Water in the heating pipe is used for space heating.
2.5 Product Flow Paths and Characteristics
3
2015-04-16
Operating Mode
Chapter 1. – Product Characteristics
Combination boiler of Heating mode. (Central Heating = CH mode)
Water in the heating pipe is used for space heating.
Comb
ustion
Air I
nlet
Gas Inlet
Space Heating
Water Return
Space Heating
Water Supply
Space Heating
Water Supply
Space Heating
Water Supply
Space Heating
Water Supply
Gas Inlet
Space Heating
Water Return
Space Heating
Water Return
Space Heating
Water Return
Note: The
condensate trap
has been hidden
to simplify the
view

Mascot FT Floor Standing Combination Boiler Page 11
2.5.2 Domestic Hot Water ow. Combination Boiler Domestic Hot Water Mode.
Cold water passes through the exchanger and is heated via a mini indirect tank.
The domestic hot water (DHW) is provided on demand.
2.5 Product Flow Paths and Characteristics
4
2015-04-16
Operating Mode
Chapter 1. – Product Characteristics
Combination boiler of Hot water mode. (Domestic Hot Water = DHW mode)
Cold water through the ‘Sub heat exchanger’, then cold water transformed into hot water.
The domestic hot water (DHW) is controlled by the consumer. It can provide hot water on demand.
Domestic Hot
Water Outlet
Domestic Hot
Water Inlet
Gas Inlet
Com
bustion
Air I
nlet
Domestic Hot
Water Outlet
Domestic Hot
Water Outlet
Gas Inlet
Domestic Hot
Water Inlet
Domestic Hot
Water Inlet
Note: The
condensate trap
has been hidden
to simplify the
view

LAARS Heating Systems
Page 12
SECTION 3.
Safety Regulations
3.1 Safety Symbols
WARNING WARNING
To avoid product damage, personal injury, or even
possible death, carefully read, understand, and
follow all the instructions in the Installation and
Operation manual before installation, operation
and service the Boiler.
Laars cannot anticipate every circumstance
that might involve a potential hazard. Therefore,
all possible incidents are not included in our
warnings. Proper installation, operation, and
service are your responsibility. You must make
sure that the operation and settings of the Boiler
are safe for you and for others.
This manual provides Safety Symbols. When the
user fails to adhere to the following requirement,
it may cause death, serious injury, and substantial
property damage.
For safety symbols, ‘DANGER’, ‘WARNING’,
CAUTION’ are indicated and the denitions for these
terms are as follow:
DANGER
Indicates an imminently hazardous situation
which, if not avoided, will result in death or
serious injury. This signal word is limited to the
most extreme situations.
WARNING
Indicates a potentially hazardous situation
which, if not avoided, could result in death or
serious injury.
CAUTION
Indicates a potentially hazardous situation
which, if not avoided, may result in minor or
moderate injury. It is also used to alert against
unsafe practices and hazards involving only
property damage.
FOR YOUR SAFETY READ BEFORE
OPERATING
If you do not follow these instructions exactly, a
re or explosion could result causing property
damage, personal injury or loss of life.
A. This appliance does not have a pilot. It
is equipped with an ignition device which
automatically lights the burner. Do not try to
light the burner by hand.
B. BEFORE OPERATING smell all around the
appliance area for gas. Be sure to smell next
to the oor because some gas is heavier than
air and will settle on the oor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric 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.
C. Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob will
not push in or turn by hand, don’t try to repair
it, call a qualied service technician. Force
or attempted repair may result in a re or
explosion.
D. Do not use this appliance if any part has
been under water. Immediately call a qualied
service technician to inspect the appliance and
to replace any part of the control system and
any gas control which has been under water.
This appliance must be installed in accordance with
local codes if any; if not, follow ANSI Z224.1/NFPA
54 or CAN/CSA B149.1, Natural Gas and Propane
Installation Code, as applicable.
This appliance is certied for use at altitudes up
to 4,500ft(1,370m) in accordance to the latest CSA/
CGA 2.17-M91 Gas-Fired Appliances for Use at
High Altitudes.

Mascot FT Floor Standing Combination Boiler Page 13
DANGER
Vapors from ammable liquids can explode and
catch on re, resulting in severe burns or death.
Do not use or store ammable products such
as gasoline, solvents or adhesives in the same
room or area near the appliance.
Keep ammable products
Far away from boiler
In approved containers
Tightly closed
Out of children’s reach
Vapors
Cannot be seen
Are heavier than air
Spread on the oor
Can spread from other rooms to the main burner
by air currents
Do not install the appliance where ammable
products will be stored.Read and follow boiler
warnings and instructions thoroughly. If owner’s
manual is missing, contact the retailer or
manufacturer.
This combination boiler must be installed by a
qualied plumber, a licensed gas tter, and/or a
professional service technician.
Improper installation and/or operation will cause a
potentially hazardous situation, such as serious injury
or death. Also, it will void the warranty.
• The National Fuel Gas Code NFPA54 / ANSI Z224.1
• National Electric Code ANSI/NEPA 70
• All applicable local, state, national and provincial
codes, regulations and laws.
Proper care is your responsibility. Carefully read and
understand the Operating Information in this manual
before operating the Laars Boiler.
Be aware of the location of the gas shut-off valve
and operation method. Close the gas shut-off valve
immediately if the appliance is subjected to re,
overheating, ood, physical damage, or any other
damaging condition that might affect the operation
of the unit. Boiler must be checked by a qualied
technician before resuming operation.
DO NOT use this Boiler if any part has been under
water. Immediately call a qualied technician for
inspecting the Boiler and replacing any part of the
control system and gas control which have been
under water.
Do not power up the unit until the gas and water
supply valves are fully opened. Make sure that the
fresh air intake port and exhaust gas port are opened
and functional.
DO NOT attempt to install, repair, or service this
Boiler by yourself.
Do not change any part of the Boiler.
Contact a qualied technician if the Boiler needs
repair or maintenance.
Ask your gas supplier for a list of qualied service
providers.
DO NOT use spray paint, hair spray, or any other
ammable spray near Boiler or near the exterior fresh
air inlet port. DO NOT place any items in or around
the exterior exhaust gas outlet port and/or fresh air
inlet port. These could restrict or block the ow in or
out of the vent system.
“Caution: While repairing control, all wires are
labeled. You must connect the wires in accordance
with the instruction. Wiring errors can cause improper
and dangerous
operation.
“Verify proper operation after servicing operation”
This consists of the gas ignition system components
which are protected from water (dripping, spraying, rain,
etc.) during operation and service (circulator replacement,
condensate trap, control replacement, etc.).
After installing the heater, safety devices must be
tested.
This boiler is equipped with a blocked vent shutoff
system.
If the error code ‘41’ occurs, follow the instructions
below.
- First, turn off the manual gas valve.
- Make sure that there is no foreign object in the vent
passage or rodent screen.
- If you do not nd any problem, do the following.
- Turn off the error state by pressing the power button
of control panel.
- If the error occurs repeatedly, call your service
technician or gas supplier.

LAARS Heating Systems
Page 14
open
Before Operation
1. Check the Gas Type (NG/LP)
When using or moving the unit for the rst time, check
if gas type matches with the gas type of the Boiler.
Check whether the gas type which is supplied is NG
(Natural Gas) or LP (Propane) and also check the
Boiler gas type. The gas type is indicated on the rating
plate on side of the Boiler.
2. Check the Power (120V 60Hz)
Check that the appliance is connected properly.
3. Check the Cold Water
Inlet valve. Please keep the
appliance water inlet valve
open at all times. The appliance
will not ignite when insufcient
water or no water is in the
heating pipes. (valve: always
open position)
4. Check the Gas Valve
Check that the manual gas shut-off valve
that supplies the Mascot FT is opened.
5. Check the area around the appliance and remove
any combustible or ammable materials. Remove
laundry or any other items that are on or near the
boiler or vent pipe.
When in Operation
CAUTION
1. Caution for Gas leak
Frequently check for a gas leak at the gas connection
portion with soapy water.
Steps to take if you have a Gas leak.
1. Shut down the boiler as soon as gas fumes are
detected.
2. Close the intermediate gas valve.
3. Open windows for ventilation.
4. Call a qualied service technician for immediate
repair.
2. Caution for Ventilation
Make sure that there is sufcient inow and outow of air
ventilation while using the unit.
If the ventilation is improper, combustion quality may
deteriorate inside the appliance and cause shortened life
of the appliance.
3. Burn Warning
Be careful not to burn yourself on the ue or pipes. They
become extremely hot during operation.
SECTION 3.
Safety Regulations
3.2 Safety Precautions and Proper Use

Mascot FT Floor Standing Combination Boiler Page 15
WARNING
Do not use the appliance for any other purpose
than for heating and hot water.
Do not store combustibles or ammable material
such as gasoline near the appliance.
Do not store other items on or near this boiler.
Do not store combustible (ammable) materials
such as papers.
Do not hang clothes on the vent pipe. This may
start a re.
Burn Protection
Be cautious when opening the
hot water tap. The water is very
hot. Especially, children or the
elderly whose skin is liable to
burn must not use the hot water
without help of a guardian.
Gas leakage test.
Gas supply line must be inspected regularly.
Do not shut off the Boiler.
When you leave home for a long time, do not
shut off Boiler. The Boiler has a freeze protection
function. The ceramic heater is installed inside of
the heater’s internal pipe to protect the heater from
freezing.
Do not wipe the appliance or control panel
with wet cloth. Electric shock may occur, or
internal parts may fail due to the exposure to
moisture.
Do not disassemble the Boiler.
If repair is required, call your local qualied
technician.
After repair of gas pipeline or gas regulator
replacement, call A qualied contractor for inspection
before starting it up.
Carbon monoxide poisoning
If vent pipe fumes enter the room, it could cause
poisoning by carbon monoxide gas. Check that the
vent pipes are properly connected. Open windows
for ventilation. Call a qualied service technician for
immediate repair.

LAARS Heating Systems
Page 16
SECTION 4. Installation
4.1 Location and Clearances
The appliance should be located to provide clearances
on all sides for maintenance and inspection. It 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 such a location is not available, it is
recommended that a suitable drain pan, adequately
drained, be installed under the appliance.
Mascot FT 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
and on a level surface. The unit shall be installed
such that the gas ignition system components are
Figure 2. Locating the Appliance.
Table 1. Minimum Clearances
Minimum clearances to Combustibles.
to Combustibles and
Suggested Service Clearance.
Minimum Clearances
For installation Suggested
From Non-Combustibles Service
/combustibles Clearance
Top of appliance 15 in (38 cm) 15 in (38 cm)
Back of
appliance 5/8 in (1.6 cm) 5/8 in (1.6 cm)
Front of
appliance 10 in (25 cm) 40 in (101 cm) or more
Side of
appliance(right) 10 in (25 cm) 25 in (64 cm)
or more
Side of
appliance(left) 3 in (8 cm) 3 in (8 cm)
Bottom of
appliance 0in (0 cm) 0in (0 cm)
protected from water (dripping, spraying, rain, etc.)
during operation and service (circulator replacement,
control replacement, etc.). When vented vertically,
the Mascot FT 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.
Suggested Service Clearance
Suggested Service Clearance
Minimum Clearance
10 in
25 cm
40 in
101 cm
5/8
in
1.6 cm
3 in
8 cm
15 in
38 cm
10 in
25 cm
25 in
64 cm

Mascot FT Floor Standing Combination Boiler Page 17
Installations must comply with
• All the local, state, provincial, and national codes,
laws, regulations and ordinances.
• National Fuel Gas Code, ANSI Z223.1 – The latest
version.
• National Electrical Code.
• ANational Standard of Canada CAN/CSA-B149.1
Check before placing the Combination boiler
• Always check the connected components which are
near to the heater. The components are below.
Water piping position / Venting adapter / Gas supply
piping / Electrical power / Condensate drain hose.
• Inspect area around Combination boiler. Remove
any combustible materials, gasoline and other
ammable liquids. Failure to keep Combination
boiler area clear and free of combustible materials,
gasoline and other ammable liquids and vapors can
result in severe personal injury, death or substantial
property damage.
• The Combination boiler which has gas control
system components must be protected from any
possible danger during operation and service.
• If new Combination boiler replaces an existing
appliance, check and correct system problems, for
example:
- Do not install if: System leaks causing oxygen
corrosion or heat exchanger cracks from hard water
deposits.
Provide clearances
• If the heater was installed in a narrow space
or corner, please ensure that there is sufcient
space for service and maintenance access. For
regular maintenance, gas and water lines must be
accessible.
The boiler must be installed on a wall that can bear its weight.
WARNING
WARNING
CLEARANCES FOR SERVICEACCESS
• If you do not provide the minimum clearances
shown, it might not be possible to service the
boiler without removing it from the space.
• Space must be provided with combustion /
ventilation air openings correctly sized for
all other appliances located in the same
space as the boiler. The boiler cover must be
securely fastened to prevent it from drawing
air from the boiler room. This is particularly
important if the boiler is in a room with other
appliances. Failure to comply with the above
warnings could result in substantial property
damage, severe personal injury, or death.

LAARS Heating Systems
Page 18
Table 2. Required Combustion Air Pipe Material.
COMBUSTION AIR INSTALLATION STANDARDS
MATERIAL UNITED STATES CANADA
ABS ANSI/ASTM D1527
PVC, sch 40 ANSI/ASTM D1785 or D2665 Airpipematerialmustbechosen
CPVC, sch 40 ANSI/ASTM F441 CPVC, sch 40,ANSI/ASTM, Polypropylene
Polypropylene UL1738, ULC S636. based upon the intended application of the boiler.
Single wall galv. steel 26 gauge
SECTION 4. Installation
4.3 Combustion Air
Mascot FT boilers 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 Mascot FT unit 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.
4.3.1 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, which follow.
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 commencing
within 12” (300mm) of the top and one commencing
within 12” (300mm) 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” (300mm) 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 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/CGA B149.1
4.3.2 Ducted Combustion Air
The combustion air can be taken through the wall, or
through the roof. When taken from the wall, it must
be taken from out-of-doors by means of the LAARS
horizontal wall terminal. When taken from the roof, a
eld-supplied rain cap or an elbow arrangement must
be used to prevent entry of rain water.
Use ABS, PVC, CPVC, polypropylene, or galvanized
pipe for the combustion air intake. 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. Maximum
linear pipe length allowed is shown in Table 6. Subtract
5 allowable linear ft. (1.5m) for every elbow used.
The connection for the intake air pipe is at the top of
the unit.
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.