Laars MASCOT FT MFTCW User manual

Installation and Operation Instructions Document 1318
H2372800-
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
Wall-Mounted, Modulating
Gas, Condensing, Combination Boiler
Model MFTCW
140,000 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
SECTION 2
Product Characteristics
2.1 Model Nomenclature ............................................. 2
2.2 Specications ........................................................ 3
2.3 Dimensions ........................................................... 4
2.4 Names of Components ......................................... 5
2.5 Product Flow and Characteristics ......................... 6
2.5.1 Central Heating Flow ....................................6
2.5.2 Domestic Hot Water Flow.............................7
SECTION 3
Safety Regulations
3.1 Safety Symbols ..................................................... 8
3.2 Safety Precautions and Proper Use .................... 10
SECTION 4
Installation
4.1 Location and Clearances .....................................12
4.2 Wall Mount Bracket ..............................................13
4.2.1 Installation Height and Location .................13
4.2.2 Hang the Boiler ..........................................13
4.3 Combustion Air .....................................................14
4.3.1 Combustion Air from Room ........................14
4.3.2 Ducted Combustion Air ..............................14
4.4 Venting (exhaust) .................................................16
4.5 General Location Guidelines ................................17
4.6 Locations for Vent Pipe Terminator ......................19
4.6.1 Direct Venting Clearances ..........................19
4.6.2 Non-Direct Venting Clearances ..................20
4.6.3 Venting Requirements in Massachusetts ...21
4.7 Air Supply and Vent Connections at the Appliance .22
4.7.1 Vent / Air Pipe Lengths ...............................22
4.7.2 Direct Venting .............................................22
4.7.3 Indoor Combustion Air ................................23
4.8 Vent / Air Pipe Termination ...................................23
4.9 Gas Supply and Piping .........................................25
4.10 Gas Supply Pressure ..........................................28
4.11 Gas Set Up and Adjustment ................................28
4.12 High Altitude Installations and Orices ................29
4.13 Natural Gas to Propane Conversion ...................30
4.14 Plumbing Guideline .............................................34
4.15 Pressure Relief Valve ..........................................38
4.16 Disposal of Condensate ......................................39
4.17 DHW Flow Restrictors .........................................40
4.18 Electrical Wiring Connections ............................ 41
4.19 DIP Switches ...................................................... 42
4.20 Control Board, Electrical Diagram ...................... 44
4.21 Ladder Diagram ................................................. 45
4.22 Electrical Connections ........................................ 46
SECTION 5
Control Display and Operation
5.1 Control Dial and Buttons .......................................48
5.2 LCD Overview .......................................................49
5.3 Operating Mode ..................................................50
5.4 Status Display Mode ...........................................51
5.5 DHW Set Point Change Mode ............................52
5.6 CH Set Point Change Mode ................................53
5.7 Storage Mode ......................................................53
5.8 Installer Mode ......................................................54
5.9 Outside Temperature (option) ..............................56
5.10 External Set Point Temperature Control ..............56
5.11 Error Mode ..........................................................57
SECTION 6
Error Codes
6.1 Error Codes ......................................................... 58
6.2 Fault Tree Analysis .............................................. 61
SECTION 7
Trouble Shooting
7.1 Diagnostics .......................................................... 63
7.2 Suggested Corrective Actions ............................. 65
SECTION 8
Maintenance
8.1 Annual Startup and General Maintenance .......... 66
8.2 Flushing the Boiler .............................................. 68
8.3 Draining and Cleaning ......................................... 69
SECTION 9
Installation Check
9.1 Quick View .......................................................... 70
9.2 Final Check Lists ................................................. 70
SECTION 10
Repair Part Diagram
10.1 Parts List and Illustrations ................................... 71
10.2 Notes: ................................................................... 72

Mascot FT Combination Boiler Page 1
Item Description Qty
LAARS Wall Mounted,
Combination Boiler
MFTCW140 1
Installation Instructions and
Users Manual 1
Condensate Hose 1
Wall Mount Bracket 1
2 types of Wall Anchors 4
Pressure Relief Valve
(CH LINE 3/4 ˝ 30psi)
Model: CASH ACME F-82 1
3” Mesh Screens 2
4.5 GPM Flow Restrictor*
Dark Blue 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
*
A 3.2 GPM Flow Restrictor (white) has been factory installed. See Section 4.18
Installation and Operation Instructions Document 1318
H2372800-
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.
WHATTO 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 FAIRESI 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
Wall-Mounted, Modulating
Gas, Condensing, Combination Boiler
Model MFTCW
140,000 BTU/hr
• Natural Gas (NG) - Factory Con guration
• Propane Gas (LP) - Field-Convertible
4

LAARS Heating Systems
Page 2
Items Descriptions Qty
Propane Conversion Orice 1
O-Ring and Gasket Kit 1
Outdoor Sensor with screws and anchors 1
1/2” x 3/4” Bell Coupling for Gas Line 1
1.2 Included with the Appliance (continued)
Figure 1. Model Nomenclature
2 3 4 5 6 7 8 9 10 11 12 13
F T C W 1 4 0 A 1 X N
SERIES
Mascot FT C - Combi SIZE
MBTU/h
140
FUEL
N - Natural
P - Propane
CONFIG
W -Wall Hung 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.

Mascot FT Combination Boiler Page 3
Model Name MFTCW140
Gas Input Rate MAX 140,000 Btu/h
MIN 28,000 Btu/h
Hot Water Capacity
35
°F Rise 7.1 GPM
45
°F Rise 5.5 GPM
77
°F Rise 3.2 GPM
Installation Indoor / Wall hung type
Flue System Sealed Combustion Direct / Single Vent / Concentric Vent
Vent Run 2˝(50ft) , 3˝(100ft) Schedule 40 CPVC, PP, PVC
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
High re
-0.85±0.2" -0.5±0.2" -0.75±0.25" -0.4±0.25"
Low re
0.005±0.005" -0.02±0.005" -0.005±0.005"
Power Supply Main Supply 120V 60Hz / 4A
Maximum Power
Consumption 160W
Ignition System Direct Electronic Ignition / Automatic Flame Sensing
Burner System Single Orice Premixed Fuel Modulation
Gas Valve System Combination modulating (Current proportional)
Minimum Flow Rate 0.5 GPM
Dimensions W17.25˝ - H29.0˝ - D15.5˝
Weight 110 lbs
Sub Heat Exchanger Water Capacity(DHW) Under 1 Gallon
Main Controller / Control Panel NGTX-900CP / 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 1/2˝ 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
2.2 Specications
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 1503 Document 4288
800.900.9276•Fax[phone] (Customer Service, ServiceAdvisors)
20 Industrial Way,Rochester,NH 03867 •603.335.6300 •Fax [phone] (Applications Engineering)
1869SismetRoad,Mississauga, Ontario,CanadaL4W1W8•905.238.0100•Fax[phone]
www.Laars.com
Document 4288
M ascot FT Gas Conversion Kit
pg 4 of 4
Figure F (Conversion label)
19.
Once the CO2and manifold pressure measurements for both MIN and MAX Fire are correct,
turn OFF the Control Display and set DIP switches 6 and 7 to the OFF position for
Nominal Fire (normal operation).
Turn the Control Display back on when done.
20.
Write in the correct Conversion Date and the Technicians Name to the included gas
conversion sticker. See Figure F. Then apply that sticker adjacent to the rating plate.
21.
Put the boiler cover back on and assemble/tighten the 4 screws that hold the cover in place.
WARNING
Always make sure that the Control Display is turned
OFF before changing any DIP switch. Then turn Control
Display back ON to continue with CO2measurements.
TableC
TableD
This unit was converted on ____/____/___to _____gas
with kit #____________by______________________
(name and company __________________________
accountable)_________________________________
___________________________________________
Cette unité a été converti ____/____/____ten ______gaz
en utilisant le kit numéro _____ par______________
(nom et société_________________________________
responsable)___________________________________
_____________________________________________
CO
2
value Natural Gas (NG) Propane Gas (LP)
2˝ VENT 3˝ VENT 2˝ VENT 3˝ VENT
MFTCW140 MAX FIRE 8.5 - 10.5% 9.5 - 11%
MIN FIRE 8 - 10% 9 - 10.5 %
Manifold pressure Natural Gas (NG) Propane Gas (LP)
2˝ VENT 3˝ VENT 2˝ VENT 3˝ VENT
MFTCW140 MAX FIRE -0.15” W.C -0.216” W.C -0.15” W.C -0.216” W.C
MIN FIRE 0” W.C 0.002” W.C 0.1” W.C 0.079” W.C
NOTE: Installer is required to verify combustion
settings as part of the installation process.
CO should not exceed 200 ppm.
H2373800-

LAARS Heating Systems
Page 4
Description Diameter
A
Air Intake collar
3"
B
Vent Pipe Collar
3"
C
‘CH’ Supply Adapter
1" NPT
D
‘CH’ Return Adapter
1” NPT
E ‘
DHW’ Outlet Adapter 3/4” NPT
F
‘DHW’ Inlet Adapter
3/4” NPT
G
Gas Inlet Adapter
1/2” NPT
H
Condensate Line
1/2" NPT
2.3 Dimensions
Air Intake
Vent

Mascot FT Combination Boiler Page 5
2.4 Names of Components
# Name of Component
1
Air Vent (air eliminator)
2
Pressure Relief Valve
3
Air Intake Collar
4
Air Gas Mixing Pipe
5
Gas Valve
6
DHW Water Tank
7
Main PCB
8
Manual Power Switch (ON / OFF)
9
Recirculation Pump DHW / CH Primary Pump
10
'CH' Supply Connection
11
'CH' Return Connection
12
CH Pressure Gauge
13
DHW Outlet Connection
14
Gas Inlet Connection
15
DHW Inlet Connection (lter and ow restrictor)
# Name of Component
16
Condensate Connection
17
Condensate Trap
18
Air Pressure Switch (condensate)
19
Mixing Valve
20
Terminal Block
21
Control Panel and Display
22
Heat Exchanger
23
Ignition Trans
24
Flame Detecting Sensor
25
Burner Case
26
BLDC Fan
27
Vent Pipe
28
Air Pressure Switch
29
Vent Pipe Collar
30
Sight Glass
Hydronic Supply Hydronic Return
30

LAARS Heating Systems
Page 6
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
Hydronic Supply Hydronic Return
Vent
Combustion
Air

Mascot FT Combination Boiler Page 7
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.
Integral Mini
Indirect Tank
(DHW)
Domestic Hot
Water Inlet
Domestic Hot
Water Outlet
2.5 Product Flow Paths and Characteristics
DHW Supply
Vent
Combustion
Air
DHW Return

LAARS Heating Systems
Page 8
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 Combination Boiler Page 9
DANGER
Vapors from ammable liquids will explode and
catch on re. These will cause death or severe
burns.
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 10
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.
open
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 Combination Boiler Page 11
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 12
SECTION 4.
Installation
4.1 Location and Clearances
The Mascot FT must be mounted to a suitable wall by
a qualied heating contractor under the guidelines of a
boiler. The wall may be of concrete or wood. Suitable
fasteners for concrete or wood must be used. Failure to
wall mount this boiler using correct fasteners will affect
the performance and life expectancy of the boiler and
will void the warranty.
Figure 2. Locating the Appliance.
9
23
3
8
3
8
6
15
12
30
Table1. Minimum Clearances
For installation from
Non-Combustibles and
Combustibles
Suggested
Service
Clearance
TOP of appliance 9 in
(23 cm) 18 in (46 cm)
BACK of appliance 5/8in
(1.5 cm) 5/8in (1.5 cm)
FRONT of appliance 6 in
(15 cm) 40 in (101 cm)
SIDE of appliance 3 in
(7 cm) 8 in (20 cm)
BOTTOM of
appliance 12 in (30 cm) 24 in (61 cm)
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.
Minimum clearances to Combustibles.
toCombustiblesandforService.

Mascot FT Combination Boiler Page 13
4.2 Wall Mount Bracket
• 4.2.1 The installation height and location for your
Mascot FT depends on your installation scenario. With all
clearances considered, and given adequate positioning for
air supply and venting, you will need to determine the best
position to mount the Wall Mount Bracket. The wall must
be concrete, wood, or plywood over studs, and must be
strong enough to hold the boiler!
• Start by familiarizing yourself to how the
included Wall Mount Bracket hooks underneath
the two Hangers that are attached to the back of
the boiler. The ‘hooks’ of the Wall Mount Bracket will
be 3” from the Top of the boiler once the boiler is hung.
• Position the Wall Mount Bracket at the location that it will go,
being sure that it is level, and then drill 4 holes (0.47”dia)
with a 1/2” drill bit, into the wall through the Bracket.
• If mounting to a concrete wall, then use the concrete anchors.
If onto wood or 5/8” (16 mm) plywood, then use the wood
screws. Do not hang the Mascot FT onto sheetrock unless
it is possible to fasten directly
into the structural studs. If the
included anchors do not suit
your installation, you must use
‘Field Supplied’ anchors that
are appropriate for the wall’s
construction. Wall Mount
Bracket
Bolts (4) Wall Mount
Bracket
Anchors*
(4)
3" to Top
of Unit
Concrete,
Wood,
or 5/8" Plywood
4.2.2 Hang the Boiler
• Lift the boiler up, align the Hangers on the back
of the boiler with the hooks on the Wall Mount
Bracket, and hang the boiler onto the Wall Mount
Bracket. Do a visual inspection to make sure that
the boiler is hanging properly onto the hooks of
the Wall Mount Bracket.
• Fasten the bottom of the boiler to the wall using
2 suitable wall anchors (eld supplied).
Hangers (2)
(fastened to the back of unit)

LAARS Heating Systems
Page 14
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 (continued)
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.

Mascot FT Combination Boiler Page 15
The Mascot FT is standard as a Natural Gas Boiler
and must be converted if propane is the desired gas,
unless specically manufactured for propane.
Adequate drainage
• The appliance should be installed not to damage
the adjacent area. If such locations cannot be
avoided, it is recommended that a suitable drain
pan, adequately drained, be installed under the
appliance. The pan must not block combustion air
ow.
Connecting the Water Supply
• To conserve water and energy, insulate all water
piping—especially the hot and recirculation water
lines. Never cover the drain or pressure relief valve.
Having a backow preventer in the cold water
supply line will prevent thermal expansion
backow. Contact the water supplier or local
plumbing inspector for information about how to
control this situation.
If overheating occurs or the gas supply fails to shut
off, turn off the manual gas valve.
This installation must conform with below section
• “Air for Combustion and Ventilation” of the
National Fuel Gas Code, ANSI Z224.1/NFPA 54,
or Sections 8.2, 8.3 or 8.4 of Natural Gas and
Propane Installation Code, CAN/CSA B149.1, or
applicable provisions of the local building codes.
CAUTION
NOTICE
The instructions for the installation of the venting
system shall specify that the horizontal portions of
the venting system shall be supported to prevent
sagging; the methods of and intervals for support
shall be specied. These instructions shall also
specify that the venting system:
Category I, II and IV boilers must be installed so
that horizontal sections have a slope of at least ¼
inch per foot (21 mm/m) to prevent accumulation of
condensate; and
For Category II and IV boilers, where necessary,
have means provided for drainage of condensate.
AVIS
Les instructions d'installation du système
d'évacuation doivent préciser que les sections
horizontales doivent être supportées pour prévenir
le échissement. Les méthodes et les intervalles
de support doivent être spéciés. Les instructions
doivent aussi indiquer les renseignements suivants:
les chaudières de catégories I, II et IV doivent
présenter des tronçons horizontaux dont la pente
montante est d'au moins ¼ po par pied (21 mm/m)
entre la chaudière et l'évent; les chaudières de
catégories II et IV doivent être installées de façon à
empêcher l'accumulation de condensat;
et si nécessaire, les chaudières de catégories II et IV
doivent être pourvues de dispositifs d'évacuation du
condensat.

LAARS Heating Systems
Page 16
Table 3. Required Exhaust Vent Material.
VENTING INSTALLATION STANDARDS
MATERIAL UNITED STATES CANADA
 StainlessSteel UL1738 VentingmustbeULC-S636certiedforuseas
PVC, sch 40 ANSI/ASTM D1785 ventingmaterial.Theventingmaterialmustbechosen
CPVC, sch 40 ANSI/ASTM F441 basedupontheintendedapplicationoftheboiler.
Polypropylene UL1738orULC-S636
4.4 Venting (Exhaust)
The ue temperature of the Mascot FT changes
dramatically with changes in operating water
temperature. Therefore, it is necessary to assess the
application of the boiler to determine the required
certied vent class. If the Mascot FT is installed
in an application where the ambient temperature
is elevated, and/or installed in a closet/alcove,
CPVC, polypropylene, or stainless steel material is
required. If the system temperatures are unknown at
the time of installation, stainless, polypropylene or
CPVC material is recommended.
TheMascotFTisaCategoryIVapplianceandmay
beinstalledwithPVC,CPVCorpolypropylenethat
complieswithULC-S636, ANSI/ASTM D1785 F441
(see Table 3) orastainlesssteelventingsystemthat
complieswithUL1738StandardandULCS636.
WARNING
UseofcellularcorePVC(ASTMF891),cellularcore
CPVC,orRadel®(polyphenolsulfone)inventing
systemsshallbeprohibited.
WARNING
Failuretousetheappropriateventmaterial,installation
techniques,glues/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Z224.1/NFPA54,CAN/CSAB149.1
andULC-S636.Failuretofollowthismanualand
applicablecodesmayleadtopropertydamage,severe
injury,ordeath.
INSTALLATIONS IN CANADA require the use of
venting material certied to ULCS636. All Gas
vents connected to the Mascot FT, plastic, stainless
steel or otherwise must be certied to this ULC
standard. Appropriate selection of vent material is
very important for proper performance and safe
operation of the Mascot FT.
The ue temperature of the Mascot FT changes
dramatically with changes in operating water
temperature. Therefore, it is necessary to assess
the application of the boiler to determine the
required certied vent class. If the Mascot FT is
installed in an application where the outlet water
temperature exceeds 145°F, and/or installed in a
closet, class IIB or higher vent material is required.
If the system temperatures are unknown at the time
of installation, class IIB or higher venting material
is recommended.
IN CANADA all venting used must meet the
following requirements:
1. ULC-S636 certied and marked
2. The rst 3 feet of venting must be accessible
for visual inspection.
3. All components used in the vent system must
be from a certied manufacturer.
4 . Vent system components must not be mixed
with alternate manufacturers certied
components and/or unlisted components.
5 . The venting must be installed according to the
vent manufacturers installation instructions.
Theunit’sventcanterminatethroughtheroof,or
NOTICE
DO NOT COMMON VENT MASCOT FT UNITS.
Mascot FT units are never permitted to share a
vent with Category I appliances.
AVIS
NE PAS ÉVENT COMMUNE MASCOTTE FT UNITÉS.
Mascotte FT unités ne sont jamais autorisés à
partager un évent Catégorie I avec les appareils.

Mascot FT Combination Boiler Page 17
4.5 General Location Guideline
1.Ventsysteminstallationmustbeinaccordance
withLocalcodesor,intheabsenceoflocalcodes,
theNationalFuelGasCode,ANSIZ224.1/NFPA
54and/orCSAB149.1,NaturalGasandPropane
InstallationCode.
2.TheBoilerisdesignedtobeinstalledasaDirect
Vent(sealedcombustion)type.Theairfor
combustionmustbesupplieddirectlyfromthe
outsidetotheburner.Also,theuegasesmustbe
venteddirectlytotheoutdoors(throughwallorroof).
3.Donotinstallventingsystemcomponentsonthe
exteriorofbuildingexceptasspecicallyrequiredby
theseinstructions
 -Ventterminalsmustbeatleast1footfromanydoor,
window,orgravityinletintothebuilding.
 -Maintainthecorrectclearanceandorientation
betweentheventandairintaketerminals.
  Theventandairintaketerminalsmustbeatthe
sameheightandtheircenterlinesmustbespaced
apart12˝minimum.
 -Thebottomoftheventandairintaketerminalmust
beatleast12˝abovethenormalsnowline.Inno
caseshouldtheybelessthan12˝abovegrade
level.
WARNING
FailuretoventthisBoilerinaccordancewith
theseinstructionscouldcauseare,resulting
inseverepropertydamage,personalinjuryor
death.
Donotinterchangeventsystemsormaterials
unlessitisspecied.
Theuseofthermalinsulationcoveringpipeand
ttingsisprohibited.
Donotapplyanelectricdamper,drafthoodor
ventdamperwiththisBoiler.
Donotlocateventterminationwhereexposed
toprevailingwinds.Moistureandicemayfall
onsurfacearoundventtermination.Toprevent
deterioration,surfacemustbeingoodrepair
 (sealed,painted,etc.).
throughanoutsidewall.
Ventpipemustpitchupward,towardthevent
terminal,notlessthan1/4”perfoot,sothat
condensatewillrunbacktotheMascotFTto
drain.Routeventpipetotheheaterasdirectly
aspossible.Sealalljointsandprovideadequate
hangersasrequiredintheventingsystem
manufacturer’sInstallationInstructions.Horizontal
portionsoftheventingsystemmustbesupported
topreventsaggingandmaynothaveanylow
sectionsthatcouldtrapcondensate.Theunitmust
notsupporttheweightoftheventpipe.
 -Donotinstalltheventterminaldirectlyover
windowsordoors.
 -Airintaketerminalmustnotterminateinareasthat
mightcontaincombustionaircontaminates,such
asnearswimmingpools.
 -Forsidewallventing,theminimumhorizontal
distancebetweenanyadjacentindividualModule
(Boiler)ventterminationsistwelve(12)inches.It
isbettertobefarmorethan12inchesforavoiding
frostdamagetobuildingsurfaceswherevent
terminationsareplaced.
 -Theminimumhorizontaldistancebetweenany
adjacentindividualmodule(boiler)roofvent
endpieceisone(1)foot.

LAARS Heating Systems
Page 18
4.6 Locations for Vent Pipe Terminator
Description US Direct Vent Instal-
lations Canadian Direct Vent Installations
AClearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm)
BClearance to window or door that may be opening 12 in (30 cm) 36 in (91 cm)
CClearance to permanently closed window * *
DVertical clearance to ventilated soft located above the terminal
within
a horizontal distance of 2 feet from the center line of the terminal * *
EClearance to unventilated soft * *
FClearance to outside corner * *
GClearance to inside corner * *
HClearance to each side of center line extended above meter/
regulator assembly *
3 ft (91 cm) within a
height 15 ft (457 cm)
above the meter/
regulator assembly
IClearance to service regulator vent outlet * 3 ft (91 cm)
JClearance to non-mechanical air supply inlet to building or the
combustion air inlet to any other appliance 12 in (30 cm) 36 in (91 cm)
KClearance to a mechanical air supply inlet 3 ft (91 cm) above if
within 10 ft (3 m) hori-
zontally 6 ft (1.83 m)
LClearance above paved sidewalk or paved driveway located on
public property * 7 ft (2.13 m)
MClearance under veranda, porch, deck, or balcony * 12 in (30 cm)
* For clearances not specied in ANSI Z224.1 / NFPA 54 or CAN/CSA-B 149.1, please use clearances in
accordance with local installation codes and the requirement of the gas supplier.
4.6.1 Direct Venting Clearances
Table4. Direct Vent Clearances