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.