Page 1
Installation and Operation Instructions Document 1342E
Installation and Operation
Instructions for
®
MASCOT
FT
Wall-Mounted, Modulating
Gas, Condensing, Heating Only, Boiler
Model MFTHW
80,000 BTU/hr
100,000 BTU/hr
120,000 BTU/hr
140,000 BTU/hr
199,000 BTU/hr
• Natural Gas (NG) - Factory Conguration
• Propane Gas (LP) - Field-Convertible
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualied 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
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 qualied installer, service agency, or gas
supplier.
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 inammables dans
le à proximité de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE
• 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 qualié
ou par le fournisseur de gaz.
GAZ:
H2375000E
Page 2
LAARS Heating Systems
SECTION 1
TABLE OF CONTENTS
Product Accessories
1.1 Introduction ........................................................... 1
1.2 Included with the Appliance ................................... 1
SECTION 2
Product Characteristics
2.1 Model Nomenclature .............................................2
2.2 Specications ........................................................ 3
2.3 Dimensions ........................................................... 6
2.4 Names of Components ......................................... 8
2.5 Product Flow and Characteristics ....................... 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 .....................................15
4.2 Wall Mount Bracket
4.2.1 Installation Height and Location .................16
4.2.2 Hang the Boiler ..........................................16
4.3 Combustion Air ..................................................... 17
4.3.1 Combustion Air from Room ........................ 17
4.3.2 Ducted Combustion Air .............................. 17
4.4 Venting (exhaust) ................................................. 19
4.5 General Location Guidelines ................................20
4.6 Locations for Vent Pipe Terminator ......................21
4.6.1 Direct Venting Clearances ..........................21
4.6.2 Non-Direct Venting Clearances ..................22
4.6.3 Venting Requirements in Massachusetts ... 23
4.7 Air Supply and Vent Connections at the Appliance . 25
4.7.1 Vent / Air Pipe Lengths ...............................25
4.7.2 Direct Venting .............................................25
4.7.3 Indoor Combustion Air ................................26
4.8 Vent / Air Pipe Termination ...................................27
4.9 Gas Supply and Piping ......................................... 29
4.10 Gas Supply Pressure ..........................................34
4.11 Gas Set Up and Adjustment ................................35
4.12 High Altitude Installations and Orices ................36
4.13 Natural Gas to Propane Conversion ...................37
4.14 Plumbing Guidelines ...........................................39
4.15 Pressure Relief Valve ..........................................46
4.16 Disposal of Condensate ......................................47
4.17 Electrical Wiring Connections .............................48
..............................................16
4.18 DIP Switches .......................................................49
4.19 Control Board, Electrical Diagram ......................50
4.20 Ladder Diagram ..................................................51
4.21 Electrical Connections .........................................52
SECTION 5
Control Display and Operation
5.1 Control Dial and Buttons ......................................54
5.2 LCD Overview ...................................................... 55
5.3 Operating Mode ...................................................56
5.4 Setting the Clock ..................................................57
5.5 CH Set Point Change Mode ................................. 58
5.6 Status Display Mode ............................................59
5.7 Installer Mode .......................................................60
5.8 Storage (Indirect Water Heater) ........................... 63
5.9 Outdoor Reset Adjustment ................................... 64
5.10 External Set Point Temperature Control ...............64
5.11 Error Mode ...........................................................65
SECTION 6
Error Codes
6.1 Error Codes ..........................................................66
6.2 Fault Tree Analysis ...............................................70
SECTION 7
Trouble Shooting
7.1 Diagnostics ........................................................... 71
7.2 Suggested Corrective Actions .............................. 72
SECTION 8
Maintenance
8.1 Annual Startup and General Maintenance ........... 74
8.2 Flushing the Boiler ...............................................76
SECTION 9
Installation Check
9.1 Quick View ...........................................................77
9.2 Final Check Lists ..................................................78
SECTION 10
Parts
10.1 Parts List and Illustrations ...............................80-91
Page 3
Mascot FT, Heating Only, Boiler
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 Boiler. 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
1.2 Included with the Appliance
Item Description Qty
Page 1
Edition “National Fuel Gas Code” or
2) CSA B149.1 “Natural Gas and Propane Installation Code” and
with the requirement of the local utility or other authorities having
jurisdiction. Such applicable requirements take precedence over
the general instructions contained herein.
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.
LAARS Wall Mounted,
Boiler
MFTHW (all sizes)
Installation Instructions and
User’s Manual
Condensate Hose
Wall Mount Bracket
2 types of Wall Anchors
1
1
1
1
4
4
Pressure Relief Valve
(CH LINE 3/4˝ 30psi)
Model: CASH ACME F-82
Mesh Screens
3”
1
2
Page 4
Page 2
1.2 Included with the Appliance (continued)
Items Descriptions Qty
Propane Conversion Orice
80 / 100 / 120 / 140 MBH
O-Ring and Gasket Kit 1
Outdoor Temperature Sensor
with anchors and screws
LAARS Heating Systems
175 / 199 MBH
1
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 identies the characteristics of your Mascot FT.
2 3 4 5 6 7 8 9 10 11 12 13
1
F T H W A 1 X N
M
SERIES
Mascot FT
H - Heating
CONFIG
W - Wall Hung
Figure 1. Model Nomenclature
SIZE
MBTU/h
80
100
120
140
199
FUEL
N -
Natural
P - Propane
ALTITUDE
A - 0 -10,000 Feet
REVISION
1 - First
OPTIONS
X - Standard
N - with Pump
PUMP
Page 5
Mascot FT, Heating Only, Boiler
2.2 Specications,80MBHand100MBH
Model Name MFTHW80 MFTHW100
Page 3
Gas Input Rate
Installation Indoor / Wall hung type
Flue System
Vent Run 2˝(50ft) , 3˝(100ft) Schedule 40 CPVC, PP
Orice Size
Gas Supply Pressure
Manifold Pressure
Power Supply
Ignition System
Burner System
MAX 80,000 Btu/h 100,000 Btu/h
MIN 16,000 Btu/h 20,000 Btu/h
Sealed Combustion Direct / Single Vent /Sidewall
NG 0.2”(5.05mm) 0.215˝ (5.45mm)
LP 0.157”(4.0mm) 0.169˝ (4.3mm)
NG 3.5˝ WC to 14.0˝ WC
LP 3.5˝ WC to 14.0˝ WC
Gas type LP NG
Max re
Min re
Main Supply 120V 60Hz / 4A
Maximum Power
Consumption
-0.102˝ WC -0.102˝ WC
0.00˝ WC 0.00˝ WC
Direct Electronic Ignition / Automatic Flame
Single Orice Premixed Fuel Modulation Metal
Vent
160W
Sensing
Ceramic Infrared
Gas Valve System Combination modulating (Current proportional)
Dimensions W17.3˝ - H29.0˝ – D14.9˝
Weight 100 lbs
Main Controller / Control Display NGTB-900CP / P-950EH
Water Pressure CH Min 15 ~ Max 30 PSI
Connection Sizes
Materials
Safety Devices
CH Supply/Return 1 ¼˝ NPT
Gas Inlet 3/4˝ NPT
Casing Cold Rolled Carbon Steel
Heat Exchanger
Primary Heat Exchanger : Stainless Steel
Sub Heat Exchanger : Stainless Steel
Flame Rod, Overheat Cut Off Device, Gas Valve
Operation Detector, Water Temperature Sensor,
Over-heat Limit Switch,
Page 6
Page 4
2.2 Specications,125MBHand140MBH
Model Name MFTHW120 MFTHW140
LAARS Heating Systems
Gas Input Rate
Installation Indoor / Wall hung type
Flue System
Vent Run 2˝(50ft) , 3˝(100ft) Schedule 40 CPVC, PP
Orice Size
Gas Supply Pressure
Manifold Pressure
Power Supply
Ignition System Direct Electronic Ignition / Automatic Flame Sensing
MAX 120,000 Btu/h 140,000 Btu/h
MIN 24,000 Btu/h 28,000 Btu/h
Sealed Combustion Direct / Single Vent /Sidewall
NG 0.213˝ (5.4mm) 0.255˝ (6.5mm)
LP 0.173˝ (4.4mm) 0.191˝ (4.85mm)
NG 3.5˝ WC to 14.0˝ WC
LP 3.5˝ WC to 14.0˝ WC
Gas type LP NG
Max re
Min re
Main Supply 120V 60Hz / 4A
Maximum Power
Consumption
-0.216˝ WC -0.216˝ WC
0.00˝ WC 0.00˝ WC
Vent
160W
Burner System
Gas Valve System Combination modulating (Current proportional)
Dimensions W17.3˝ - H29.0˝ – D14.9˝
Weight 100 lbs
Main Controller / Control Display NGTB-900CP / P-950EH
Water Pressure CH Min 15 ~ Max 30 PSI
CH Supply/Return 1 ¼˝ NPT
Connection Sizes
Gas Inlet 3/4˝ NPT
Casing Cold Rolled Carbon Steel
Materials
Heat Exchanger
Safety Devices
Single Orice Premixed Fuel Modulation Metal
Ceramic Infrared
Primary Heat Exchanger : Stainless Steel
Sub Heat Exchanger : Stainless Steel
Flame Rod, Overheat Cut Off Device, Gas Valve
Operation Detector, Water Temperature Sensor,
Over-heat Limit Switch,
Page 7
Mascot FT, Heating Only, Boiler
2.2 Specications,199MBH
Model Name MFTHW199
Page 5
Gas Input Rate
Installation Indoor / Wall hung type
Flue System Sealed Combustion Direct / Single Vent / Concentric Vent
Vent Run 2˝(50ft) , 3˝(100ft) Schedule 40 CPVC, PP
Orice Size
Gas Supply Pressure
Manifold Pressure
Power Supply
Ignition System Direct Electronic Ignition / Automatic Flame Sensing
MAX 199,000 Btu/h
MIN 19,900 Btu/h
NG 0.326˝ (8.3mm)
LP 0.244˝ (6.2mm)
NG 3.5˝ WC to 14.0˝ WC
LP 3.5˝ WC to 14.0˝ WC
Gas type
Max re
Min re
Main Supply 120V 60Hz / 4A
Maximum Power
Consumption
LP NG LP NG
-0.169˝ WC -0.129”W.C -0.173˝ WC -0.134˝ WC
-0.015”W.C -0.015”W.C -0.015˝ WC -0.015˝ WC
160W
Burner System
Gas Valve System Combination modulating (Current proportional)
Dimensions W19.6˝ - H32.0˝ – D16.2˝
Weight 110 lbs
Main Controller / Control Display NGTB-900CP / P-950EH
Water Pressure Min 15 ~ Max 30 PSI
CH Supply/Return 1 ¼˝ NPT
Connection Sizes
Gas Inlet 3/4˝ NPT
Casing Cold Rolled Carbon Steel
Materials
Heat Exchanger
Safety Devices
Single Orice Premixed Fuel Modulation Metal Ceramic
Infrared
Primary Heat Exchanger : Stainless Steel
Sub Heat Exchanger : Stainless Steel
Flame Rod, Overheat Cut Off Device, Gas Valve Operation
Detector, Water Temperature Sensor, Over-heat Limit Switch,
Page 8
Page 6
2.3 Dimensions
LAARS Heating Systems
MFTHW
80/100/120/140
Heating only boiler
Description Diameter
A Air Intake Collar 3˝
B Vent Pipe Collar 3˝
C 'CH' Supply Adapter
D 'CH' Return Adapter
E Gas Inlet Adapter 3/4˝
F Condensate Line 1/2˝
1
1
¼˝
¼˝
Page 9
Mascot FT, Heating Only, Boiler
2.3 Dimensions
Page 7
MFTHW
Heating only boiler
199
Description Diameter
A Air Intake Collar 3˝
B Vent Pipe Collar 3˝
C 'CH' Supply Adapter
D 'CH' Return Adapter
E Gas Inlet Adapter 3/4˝
F Condensate Line 1/2˝
1
1
¼˝
¼˝
Page 10
Page 8
2.4 Names of Components
LAARS Heating Systems
MFTHW
80/100
Heating only boiler
4 SCREWS
CONTROL
DISPLAY COVER
(HINGES UPW
ARD)
NO Name of Component
1
Air Vent (air eliminator)
2
Air Intake Collar
3
Air / Gas Mixing Pipe
4
Gas Inlet Pipe 2
5
Gas Valve
6
Exhaust Duct
7
Low Water Temperature Sensor
8
OP Sensor
9
Flame Detecting Sensor
10
Main PCB
11
Control Display
12
Manual ON/OFF Power Switch
13
Gas Inlet Pipe 1
14
‘CH’ Internal Pump
15
Gas Inlet Adapter
16
‘CH’ Supply Adapter
To remove the cover, unthread the 4 phillips head screws.
Keep the screws in a safe place for re-application of cover.
This is typical for all models of the Mascot FT.
NO Name of Component
17
CH Pressure Gauge
18
‘CH’ Return Adapter
19
Condensate Trap
20
Condensate Adapter
21
CH Return Temperature Sensor
22
Condensate Air Pressure Switch
23
Terminal Block
24
Heat Exchanger
25
Ignition Transformer
26
Sight Glass
27
Burner Overheat Switch
28
Igniter
29
BLDC Fan (blower)
30
Exhaust Temperature Sensor
31
Air Pressure Sensor
32
Vent Pipe Collar
Page 11
Mascot FT, Heating Only, Boiler
2.4 Names of Components (continued)
Page 9
MFTHW
120/140
Heating only boiler
NO Name of Component
1
Air Vent (air eliminator)
2
Air Intake Collar
3
Air / Gas Mixing Pipe
4
Gas Inlet Pipe 2
5
Gas Valve
6
Exhaust Duct
7
Low Water Temperature Sensor
8
OP Sensor
9
Flame Detecting Sensor
10
Main PCB
11
Control Display
12
Manual ON/OFF Power Switch
13
Gas Inlet Pipe 1
14
‘CH’ Internal Pump
15
Gas Inlet Adapter
16
‘CH’ Supply Adapter
NO Name of Component
17
CH Pressure Gauge
18
‘CH’ Return Adapter
19
Condensate Trap
20
Condensate Adapter
21
CH Return Temperature Sensor
22
Condensate Air Pressure Switch
23
Terminal Block
24
Heat Exchanger
25
Ignition Transformer
26
Sight Glass
27
Burner Overheat Switch
28
Igniter
29
BLDC Fan (blower)
30
Exhaust Temperature Sensor
31
Air Pressure Sensor
32
Vent Pipe Collar
Page 12
Page 10
2.4 Names of Components (continued)
MFTHW
Heating only boiler
199
LAARS Heating Systems
NO Name of Component
1
Air Vent (air eliminator)
2
Air Intake Collar
3
Gas Valve
4
Gas Inlet Pipe 2
5
Air / Gas Mixing Pipe
6
Gas Inlet Pipe 1
7
Exhaust Duct
8
OP Sensor
9
Low Water Level Sensor
10
Main PCB
11
Flame Detecting Sensor
12
Control Display
13
Manual ON/OFF Power Switch
14
‘CH’ Internal Pump
15
Gas Inlet Adapter
16
‘CH’ Supply Adapter
NO Name of Component
17
CH Pressure Gauge
18
‘CH’ Return Adapter
19
Condensate Trap
20
Condensate Adapter
21
CH Return Temperature Sensor
22
Condensate Air Pressure Switch
23
Terminal Block
24
Heat Exchanger
25
Ignition Transformer
26
Sight Glass
27
Burner Overheat Switch
28
Igniter
29
BLDC Fan (blower)
30
Exhaust Temperature Sensor
31
Air Pressure Sensor
32
Vent Pipe Collar
Page 13
Mascot FT, Heating Only, Boiler
Gas
Input
Air Intake
2.5 ProductFlowPathsandCharacteristics
Water in the heating pipe is used for space heating.
Combustion
Air
Page 11
Vent
Hydronic Supply Hydronic Return
Page 14
Page 12
SECTION 3.
Safety Regulations
3.1 Safety Symbols
LAARS Heating Systems
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 denitions 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
WARNING
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 qualied 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 qualied
service technician to inspect the appliance and
to replace any part of the control system and
any gas control which has been under water.
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.
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 certied 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.
Page 15
Mascot FT, Heating Only, Boiler
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 boiler must be installed by a qualied 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 NFPA 54 / ANSI Z224.1
• National Electric Code ANSI/NEPA 70
• All applicable local, state, national and provincial
codes, regulations and laws.
Page 13
damaging condition that might affect the operation
of the unit. Boiler must be checked by a qualied
technician before resuming operation.
DO NOT use this Boiler if any part has been under
water. Immediately call a qualied 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 qualied technician if the Boiler needs
repair or maintenance.
Ask your gas supplier for a list of qualied 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.
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
- 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 Display.
- If the error occurs repeatedly, call your service
technician or gas supplier.
Page 16
Page 14
3.2 Safety Precautions and Proper Use
LAARS Heating Systems
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 insufcient water
or no water is in the
heating pipes. (valve:
always open position)
open
When in Operation
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 qualied service technician for immediate
repair.
2. Caution for Ventilation
Make sure that there is sufcient inow and outow 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.
CAUTION
4. Check the Gas V alve
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.
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 qualied service technician for
immediate repair.
Gas leakage test.
Gas supply line must be inspected regularly.
WARNING
Do not use the appliance for any other purpose
other than for residential hydronic heating.
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.
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 Display
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 qualied technician.
Page 17
Mascot FT, Heating Only, Boiler
18
46
3
8
3
8
24
60
12
30
SECTION 4.
Installation
Page 15
WARNING
4.1 Location and Clearances
The Mascot FT must be mounted to a suitable wall by
a qualied 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.
Installations must comply with
• All the local, state, provincial, and national codes,
laws, regulations and ordinances.
• National Fuel Gas Code,
version.
• National Electrical Code.
National Standard of Canada CAN/CSA-B149.1
• A
Check before placing the Boiler
• Always check the connected components which are
near to the heater
Water piping position / Venting adapter / Gas supply
piping / Electrical power / Condensate drain hose.
• Inspect area around Boiler
materials, gasoline and other ammable liquids.
Failure to keep 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 Boiler which has gas control system
components must be protected from any possible
danger during operation and service.
• If new 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.
ANSI Z223.1 – The latest
. The components are below.
. Remove any combustible
Provide clearances
• If the heater was installed in a narrow space
or corner
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.
, please ensure that there is sufcient
Figure 2. Locating the Appliance.
Minimum clearances to Combustibles.
For installation from
Non-Combustibles and
TOP of appliance
BACK
Combustibles
of appliance
FRONT of appliance
of appliance
SIDE
OM of
BOTT
appliance
Table 1. Minimum Clearances
to Combustibles and for Service.
18 in
(23 cm)
0
in
(0 cm)
24 in
(60 cm)
3 in
(7 cm)
12 in
(30 cm)
Suggested
Service
Clearance
18 in
(46 cm)
0
in
(0 cm)
40 in
(101 cm)
8 in
(20 cm)
24 in
(61 cm)
WARNING
CLEARANCES FOR SERVICE ACCESS
• 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.
Page 18
Page 16
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!
LAARS Heating Systems
to Top
3"
of Unit
Anchors
(4)
*
Concrete,
Wood,
or 5/8" Plywood
• 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.
Bolts (4)
Hangers (2)
(fastened to the back of unit)
Wall Mount
Bracket
Wall Mount
Bracket
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).
Page 19
Mascot FT, Heating Only, Boiler
4.3 Combustion Air
Page 17
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
spaceinwhichitisinstalled,orthecombustionair
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 crosssectional 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 1 square inch per 2000 Btu/hr (1100 square
mm/kW) of total input rating of all equipment in the
enclosure.
Method 2: One permanent opening, commencing
within 12” (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 1 square inch per 3000
Btu/hr (734 square mm/kW) of the total input rating of
all equipment located in the enclosure. This opening
must not be less than the sum of the areas of all vent
connectors in the conned 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.
COMBUSTION AIR INSTALLATION STANDARDS
MATERIAL UNITED STATES CANADA
ABS ANSI/ASTM D1527
PVC, sch 40 ANSI/ASTM D1785 or D2665 Ai r p i p e m a t e r i a l m u s t b e c h o s e n
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
Table 2. Required Combustion Air Pipe Material.
Page 20
Page 18
LAARS Heating Systems
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 specied. 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.
NOTICE
CAUTION
The Mascot FT is standard as a Natural Gas Boiler
and must be converted if propane is the desired gas,
unless specically 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.
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 spéciés. 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.
AVIS
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 backow preventer in the cold water
supply line will prevent thermal expansion
backow. 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.
Page 21
Mascot FT, Heating Only, Boiler
4.4 Venting (Exhaust)
Page 19
DO NOT COMMON VENT MASCOT FT UNITS.
Mascot FT units are never permitted to share a
vent with Category I appliances.
NOTICE
TheuetemperatureoftheMascotFTchanges
dramatically with changes in operating water
temperature.Therefore,itisnecessarytoassessthe
application of the boiler to determine the required
certiedventclass.IftheMascotFTisinstalled
in an application where the ambient temperature
iselevated,and/orinstalledinacloset/alcove,
CPVC,polypropylene,orstainlesssteelmaterialis
required. If the system temperatures are unknown at
thetimeofinstallation,stainless,polypropyleneor
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.
NE PAS ÉVENT COMMUNE MASCOTTE FT UNITÉS.
Mascotte FT unités ne sont jamais autorisés à
partager un évent Catégorie I avec les appareils.
AVIS
__________________________________________
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel® (polyphenolsulfone) in non-metallic
venting systems is prohibited and that covering non-
metallic vent pipe and ttings with thermal insulation is
prohibited.
_________________________________________
INSTALLATIONS IN CANADA require the use of
ventingmaterialcertiedtoULCS636.AllGas
ventsconnectedtotheMascotFT,plastic,stainless
steelorotherwisemustbecertiedtothisULC
standard. Appropriate selection of vent material is
very important for proper performance and safe
operation of the Mascot FT.
TheuetemperatureoftheMascotFTchanges
dramatically with changes in operating water
temperature.Therefore,itisnecessarytoassess
the application of the boiler to determine the
requiredcertiedventclass.IftheMascotFTis
installed in an application where the outlet water
temperatureexceeds145°F,and/orinstalledina
closet,classIIBorhigherventmaterialisrequired.
If the system temperatures are unknown at the time
ofinstallation,classIIBorhigherventingmaterial
is recommended.
IN CANADA all venting used must meet the
following requirements:
1. ULC-S636certiedandmarked
2. Therst3feetofventingmustbeaccessible
for visual inspection.
3. All components used in the vent system must
befromacertiedmanufacturer.
4 . Vent system components must not be mixed
WARNING
VENTING INSTALLATION STANDARDS
MATERIAL UNITED STATES CANADA
Stainless Steel UL 1738 Venting must be ULC-S636 certied 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
Table 3. Required Exhaust Vent Material.
Page 22
Page 20
LAARS Heating Systems
withalternatemanufacturerscertied
componentsand/orunlistedcomponents.
5. Theventingmustbeinstalledaccording
to the vent manufacturers installation
instructions.
The unit’s vent can terminate through the roof, or
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.
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 specied.
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.).
4.5GeneralLocationGuideline
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 specically 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.
- 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.
Page 23
Mascot FT, Heating Only, Boiler
4.6LocationsforVentPipeTerminator
Page 21
* For clearances not specied 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.
within
US Direct Vent Instal-
lations
* *
*
12 in (30 cm) 36 in (91 cm)
3 ft (91 cm) above if
within 10 ft (3 m) hori-
zontally
* 7 ft (2.13 m)
Canadian Direct Vent
Installations
3 ft (91 cm) within a
height 15 ft (457 cm)
above the meter/
regulator assembly
6 ft (1.83 m)
4.6.1DirectVentingClearances
Description
A
B
C
D
E
F
G
H
I
J
K
L
M
Clearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm)
Clearance to window or door that may be opening 12 in (30 cm) 36 in (91 cm)
Clearance to permanently closed window * *
Vertical clearance to ventilated soft located above the terminal
a horizontal distance of 2 feet from the center line of the terminal
Clearance to unventilated soft * *
Clearance to outside corner * *
Clearance to inside corner * *
Clearance to each side of center line extended above meter/
regulator assembly
Clearance to service regulator vent outlet * 3 ft (91 cm)
Clearance to non-mechanical air supply inlet to building or the
combustion air inlet to any other appliance
Clearance to a mechanical air supply inlet
Clearance above paved sidewalk or paved driveway located on
public property
Clearance under veranda, porch, deck, or balcony * 12 in (30 cm)
Table 4. Direct Vent Clearances
Page 24
Page 22
4.6.2Non-DirectVenting(SinglePipe)Clearances
Description US Non-Direct Canadian Non-Direct
Clearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm)
A
Clearance to window or door that may be opening
B
Clearance to permanently closed window * *
C
Vertical clearance to ventilated soft located above the terminal
within a horizontal distance of 2 feet from the center line of the
D
terminal
Clearance to unventilated soft * *
E
Clearance to outside corner * *
F
Clearance to inside corner * *
G
Clearance to each side of center line extended above meter/
H
regulator assembly
Clearance to service regulator vent outlet * 36 in (91 cm)
I
Clearance to non-mechanical air supply inlet to building or the
J
combustion air inlet to any other appliance
Clearance to a mechanical air supply inlet
K
Clearance above paved sidewalk or paved driveway located on
L
public property
Clearance under veranda, porch, deck, or balcony * 12 in (30 cm)
M
LAARS Heating Systems
48 in (120 cm) below
or to side of opening;
12 in (30 cm) above
opening
* *
*
48 in (120 cm) below
or to side of opening;
12 in (30 cm) above
opening
36 in (91 cm) above
if within 10 ft (3 m)
horizontally
* 7 ft (2.13 m)
36 in (91 cm)
36 in (91 cm) within a
height 15 ft (4.57 m)
above the meter/ regulator assembly
36 in (91 cm)
6 ft (1.83 m)
Table5. Non-Direct Vent Clearances
Page 25
Mascot FT, Heating Only, Boiler
4.6.3VentingRequirementsinthe
Commonwealth of Massachusetts
Page 23
In Massachusetts the following items are required if
the side-wall exhaust vent termination is less than
seven (7) feet above nished grade in the area
of the venting, including but not limited to decks
and porches. From Massachusetts Rules and
regulations 248 CMR 5.08
1. Installation of Carbon Monoxide Detectors
At the time of installation of the side wall
vented gas fueled appliance, the installing plumber
or gastter shall observe that a hard-wired carbon
monoxide detector with an alarm battery back-up is
installed on the oor level where the gas appliance
is to be installed. In addition, the installing plumber
or gastter shall observe that a battery operated or
hard-wired carbon monoxide detector with an alarm
is installed on each additional level of the dwelling,
building or structure served by the side-wall
horizontally vented gas fueled equipment. It shall
be the responsibility of the property owner to secure
the services of qualied licensed professionals
for installation of hard-wired carbon monoxide
detectors.
a. In the event that the side-wall horizontally
vented gas fueled equipment is installed in a crawl
space or an attic, the hard-wired carbon monoxide
with alarm and battery back-up may be installed on
the next adjacent oor level.
b. In the event that the requirements of the
subdivision cannot be met at the time of completion
of installation, the owner shall have a period of thirty
(30) days to comply with the above requirements,
provided, however, that during said thirty (30) day
period, a battery operated carbon monoxide detector
with an alarm be installed.
2. Approved Carbon Monoxide Detectors
Each carbon monoxide detector shall comply
with NFPA 720 and be ANSI/UL 2034 listed and IAS
certied.
3. Signage. A metal or plastic identication plate
shall be permanently mounted to the exterior of
the building at a minimum height of eight (8) feet
above grade directly in line with the exhaust vent
terminal for horizontally vented gas fueled heating
appliance or equipment. The sign shall read, in
print no less than one-half (1/2) inch in size: “GAS
VENT DIRECTLY BELOW, KEEP CLEAR OF ALL
OBSTRUCTIONS”.
4. Inspection The state or local gas inspector of
the side-wall horizontally vented gas fueled appliance
shall not approve the installation unless, upon
inspection, the inspector observes carbon monoxide
detectors and signage installed in accordance with the
provisions of 248 CMR 5.08(2)(a) 1-4.
Page 26
Page 24
LAARS Heating Systems
NOTICE
DO NOT COMMON VENT MASCOT FT UNITS.
Mascot FT units are never permitted to share a
vent with Category I appliances.
Common Vent Test
NOTE: This section does not describe a method for
common venting Mascot FT units. It describes what
must be done when an existing unit is removed from
a common vent system.
At the time of removal of an existing boiler, the following steps
shall be followed with each appliance remaining connected to
the common venting system placed in operation, while the other
appliances remaining connected to the common venting system
are not in operation.
1. Seal any Not Used openings in the common venting system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other deciencies which
could cause an unsafe condition.
3. Insofar as is practical, close all building doors and windows
and all doors between the space in which the appliances
remaining connected to the common venting system are
located and other spaces of the building. Turn on clothes
dryers and any appliance not connected to the common
venting system. Turn on any exhaust fans, such as range
hoods and bathroom exhausts, so they will operate at
maximum speed.
4. Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust thermostat so the appliance will
operate continuously.
5. Operate the main burner for 5 minutes then, determine if the
cut-draw overows to the discharge opening. Use the ame
of a match or a candle or the smoke of a cigarette, a cigar or
a pipe
6. Once it has been determined, according to the method
indicated above, that each device connected to the drainage
system is placed in the open air in an adequate manner.
Install the doors and windows, fans, the registers of chimneys
and gas appliances to their original position
7. Any malfunction of the venting system should be corrected so
that the installation conforms to the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 and (or) the installation codes CAN/
CSA-B149.1. If the size of a section of the evacuation system
must be changed, the system should be modied to comply
with the minimum values of the relevant tables of appendix F
of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and
(or) the installation codes CAN/CSA-B149.1
NOTICE
AVIS
NE PAS ÉVENT COMMUNE MASCOTTE FT UNITÉS.
Mascotte FT unités ne sont jamais autorisés à
partager un évent Catégorie I avec les appareils.
AVIS
Au moment du retrait d'une chaudière existante, les mesures
suivantes doivent être prises pour chaque appareil toujours raccordé
au système d'évacuation commun et qui fonctionne alors que
d'autres appareils toujours raccordés au système d'évacuation ne
fonctionnent pas:
1. Sceller toutes les ouvertures non utilisées du système
d'évacuation.
2. Inspecter de façon visuelle le système d'évacuation pour
déterminer la grosseur et l'inclinaison horizontale qui conviennent
et s'assurer que le système est exempt d'obstruction,
d'étranglement, de fuite, de corrosion et autres défaillances qui
pourraient présenter des risques.
3. Dans la mesure du possible, fermer toutes les portes et les
fenêtres du bâtiment et toutes les portes entre l'espace où les
appareils toujours raccordés au système d'évacuation sont
installés et les autres espaces du bâtiment. Mettre en marche
les sécheuses, tous les appareils non raccordés au système
d'évacuation commun et tous les ventilateurs d'extraction comme
les hottes de cuisinière et les ventilateurs des salles de bain.
S'assurer que ces ventilateurs fonctionnent à la vitesse maximale.
Ne pas faire fonctionner les ventilateurs d'été. Fermer les registres
des cheminées.
4. Mettre l'appareil inspecté en marche. Suivre les instructions
d'allumage. Régler le thermostat de façon que l'appareil fonctionne
de façon continue.
5. Faire fonctionner le brûleur principal pendant 5 min ensuite,
déterminer si le coupe-tirage déborde à l'ouverture de décharge.
Utiliser la amme d'une allumette ou d'une chandelle ou la fumée
d'une cigarette, d'un cigare ou d'une pipe.
6. Une fois qu'il a été déterminé, selon la méthode indiquée cidessus, que chaque appareil raccordé au système d'évacuation
est mis à l'air libre de façon adéquate. Remettre les portes et
les fenêtres, les ventilateurs, les registres de cheminées et les
appareils au gaz à leur position originale.
7. T out mauvais fonctionnement du système d'évacuation commun
devrait être corrigé de façon que l'installation soit conforme au
National Fuel Gas Code, ANSI Z223.1/NFPA 54 et (ou) aux codes
d'installation CAN/CSA-B149.1. Si la grosseur d'une section
du système d'évacuation doit être modiée, le système devrait
être modié pour respecter les valeurs minimales des tableaux
pertinents de l'appendice F du National Fuel Gas Code, ANSI
Z223.1/NFPA 54 et (ou) les codes d'installation CAN/CSA-B149.1
Page 27
Mascot FT, Heating Only, Boiler
4.7 Air Supply and Vent Connections at the Appliance
4.7.1Vent/AirPipeLengths
Page 25
Boiler model
MFTHW (all sizes) 100´ (30M) 6
Table6. MaximumVent/AirPipeLengthsforeither3”or2“Pipes
Propane models are limited to 25 equivalent feet of 2” vent
*
NOTE: For additional elbows, reduce maximum allowable length
• 5 feet (1.5M) for each additional 3-inch 90-degree elbow
• 2.5 feet (0.75M) for each additional 3-inch 45-degree elbow
• 5 feet (1.5M) for each additional 2-inch 90-degree elbow
• 4 feet (1.2M) for each additional 2-inch 45-degree elbow
•Thethicknessofthewallventsinstalled:Min4˝~Max20˝
NOTE: The Mascot FT is factory set to
operate using 3” piping for Intake and
Vent. For 3” Pipe vent, the default setting
for DIP 4 is ON. If your installation is
using a 2” vent pipe, DIP Switch 4 must
be in the OFF position.
Refer to Section 4:18
3˝ Combustion Air / Vent Pipe 2˝ Combustion Air / Vent Pipe
Max Elbow Max Max Elbow Max
50´
3” pipe
(15M*)
*
4
4.7.2 Direct Venting
The boiler uses 3˝ or 2˝ diameter exhaust and 3˝
or 2˝diameter intake air ducts. To ensure the draw
of air directly from and exhaust of air directly to the
outside of the building, create an airtight seal from
the boiler collar to the vent termination.
(For installations in Canada) eld-supplied plastic
vent piping must comply with CAN/CSA B149.1
(latest edition) and be certied by the Standard
For Type BH Gas Venting Systems, ULC-S636.
Components of this listed system must not be
interchanged with other vent systems or unlisted
pipes or ttings. All plastic components and
specied primers and glues of the certied vent
system must be from a single system manufacturer
and must not be intermixed with another system
manufacturer’s parts.
Tightening — Boiler Collar (Socket) to Vent
Pipe & Inlet Pipe
- Clean and dry your selected PVC, CPVC vent
pipe and Laars Boiler collar (socket).
- You can select to the size of vent pipe(2˝ & 3˝),
according to the installation conditions.
- Push the pipe into the collar (socket) until it
touches the bottom of the socket tting.
- For 2” installations, install a eld supplied 3” to
2” adaptor. Adaptor must be installed in vertical
section of piping only.
2”pipeconnected,usinganadapter
3” to 2”
adapter
is NOT
included.
Page 28
Page 26
LAARS Heating Systems
4.7.3 Indoor Combustion Air
Read and Follow Sections 4.3 Guidelines First.
1. Insert the termination end cap into the intake air duct.
2. Provide two openings to allow for circulation of
combustion air as specied by ANSI Z224.1/NFPA 54.
In Canada refer to CAN/CSA B-149.1
NOTE: The Mascot FT needs fresh air for safe operation and
must be installed so there are provisions for adequate
combustion and ventilation air.
Model MFTHW80 MFTHW100 MFTHW120 MFTHW140 MFTHW199
Maximum Input (BTU/H) 80,000 100,000 120,000 140,000 199,000
Indoor make up air is provided,
a minimum free area of 1 in2
per 1,000 BTU/H
2
80 in
13 1/4˝
(W) x 13 1/4˝ (H)
2
100 in
13 1/4˝
(W) x 13 1/4˝ (H)
Table 7. Adequate Free Area
WARNING
• Use of cellular core CPVC, or Radel (polyphenolsulfone)
in venting systems is prohibited.
• Covering non-metallic vent pipe and ttings with thermal
insulation is prohibited.
• Do not obstruct the ow of combustion and ventilated air.
2
120 in
13 1/4˝
(W) x 13 1/4˝ (H)
2
140 in
13 1/4˝
(W) x 13 1/4˝ (H)
2
199 in
13 1/4˝
(W) x 13 1/4˝ (H)
Page 29
Mascot FT, Heating Only, Boiler
4.8Vent/AirPipeTermination
Page 27
Note : For using more than 1 elbow in your
vent pipe, reduce maximum allowable length
• 5 feet (1.5M) for each additional 3-inch
90-degree elbow
• 2.5 feet (0.75M) for each additional 3-inch
45-degree elbow
• 8 feet (2.4M) for each additional 2-inch
90-degree elbow
• 4 feet (1.2M) for each additional 2-inch
45-degree elbow
• The thickness of the wall vents installed :
Min 4˝ ~ Max 20˝
VENT
Vent Termination
1. Rodent Screen Installation
• Install Rodent Screen and Vent Terminal
(additional purchase), see Figure for appropriate
conguration.
• After connecting vent/air inlet terminal, it is
required to install screen for the terminal to
prevent incoming of rodent, which might cause
damage to the unit. (Extra purchase accessory
2/3˝ screen vent 1/4˝ mesh)
AIR INLET
Figure 3. Horizontal Vent Termination
• Direct Vent - Sidewall Terminations
Figure 4.
Horizontal Vent Termination (cont)
• Direct Vent - Optional Sidewall
Snorkel Terminations
VENT
AIR INLET
Page 30
Page 28
• Direct Vent - Optional Side wall Terminations
Side wall kit
(2˝ or 3˝ )
• Direct Vent - Optional Side wall Terminations
4. Concentric Vent Termination
• Direct Vent - Optional Horizontal and Vertical Concentric Vent
Side wall kit
(2˝ or 3˝ )
4.8 Vent Pipe Termination (continued)
Figure5.
Vertical Vent Termination
• Direct Vent - Vertical Terminations
with Sloped Roof
LAARS Heating Systems
VENT
AIR INLET
Figure6.
Direct Vent
• Optional Side Wall
Terminations
Figure 7.
Concentric Vent Termination
• Direct Vent - Optional Horizontal
and Vertical Concentric Vent
1" (25mm) to
4" (100mm)
Maintain 12"
(300
mm)min
Strap
Combustion Air
Vent
Vent
Combustion Air
US 12 in (30cm)
Page 31
Mascot FT, Heating Only, Boiler
Page 29
4.9 Gas Supply and Piping
Gas piping should be supported by suitable hangers or
oor stands, not the appliance.
Review the following instructions before proceeding with
the installation.
1. Verify that the appliance is tted for the proper type
of gas by checking the rating plate. Mascot FT will
function properly at elevations up to 10,000 feet
(3050 m). Refer to Section 4.12 for High Altitude
Settings.
2. The maximum inlet gas pressure must not exceed
13" W.C. (3.2kPa). The minimum inlet gas pressure
is 3.5" W.C. (1.0kPa).
3. Refer to Table 8, Table 9 and T able 10 to size
piping.
4. Run gas supply line in accordance with all
applicable codes.
5. Locate and install manual shutoff valves in
accordance with state and local requirements.
6. A sediment trap must be provided upstream of the
gas controls.
7. All threaded joints should be coated with piping
compound resistant to action of liqueed petroleum
gas.
8. The appliance and its individual shutoff valve
must be disconnected from the gas supply piping
during any pressure testing of that system at test
pressures in excess of 1/2 PSIG (3.45kPa).
9. The unit must be isolated from the gas supply
system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than
1/2 PSIG (3.45kPa).
10. The appliance and its gas connection must be leak
tested before placing it in operation.
11. Purge all air from gas lines.
CAUTION
PRV (included) must be installed immediately at the
top of boiler outlet to PRV, with no valves between.
Refer to Section 4.15
__________________________________________
WARNING:
Open ame can cause gas to ignite and result in
property damage, severe injury, or loss of life.
NOTE: The Mascot FT appliance and all other gas
appliances sharing the gas supply line must be ring at
maximum capacity to properly measure the inlet supply
pressure. The pressure can be measured at the supply
pressure port on the gas valve. Low gas pressure could
be an indication of an undersized gas meter, undersized
gas supply lines and/or an obstructed gas supply line.
SCHED40METALPIPECAPACITYFOR1.50SPECIFICGRAVITY
NOMINAL PIPE SIZE @ 11" W.C. INLET AND 0.5" W.C. PRESSURE DROP
SIZE 1/2" 3/4" 1"
LENGTH MAXIMUM CAPACITY IN THOUSANDS OF BTU PER
HOUR
20 200 418 787
40 137 287 541
60 - 231 434
80 - 197 372
100 - 175 330
NOTES: 1. Follow all local and national propane gas codes for line sizing and
equipment requirements. 2. Verify that inlet gas pressure remains between
4 and 13 inches of water column before and during operation.
Source: ANSI Z223.1-80 National Fuel Gas Code.
UNDILUTED PROPANE
Table 8. NominalPipeSize,Propane
SCH40METALPIPECAPACITYFOR0.60SPECIFICGRAVITYNATURALGAS
NOMINAL PIPE SIZE @ 0.30" W.C. PRESSURE DROP
LENGTH 3/4" 1"
FT CUBIC FEET OF GAS PER HOUR
20 190 350
40 130 245
60 105 195
80 90 170
100
Table 9. NominalPipeSize,NaturalGas
ATTENTION
PRV (inclus) doit être installé immédiatement en haut
de la chaudière sortie de PRV, sans les vannes entre.
Se reporter à la Section 4.15
__________________________________________
EQUIVALENT LENGTHS OF STRAIGHT PIPE FOR TYPICAL SCH 40 FITTINGS
FITTING 1/2" 3/4" 1"
90° ELBOW 3.6 4.4 5.2
TEE 4.2 5.3 6.6
NOMINAL PIPE SIZE
LINEAR FEET
Table 10. Equivalent Pipe Lengths
Page 32
Page 30
LAARS Heating Systems
4.9 Gas Supply and Piping (continued)
Natural Gas Pipe Sizing (Maximum)
Maximum capacity of pipe in cubic feet of gas per hour for gas pressures of 0.5psi or less
and a pressure drop of 0.5 Inch water column. (Based of a 0.60 Specic gravity gas)
For reference only. Referenced from gas pipe manufacturer specications for actual delivery capacity. The
DOE standard for Natural Gas is 1100 BTU/ft3. Contact the local gas supplier for actual BTU/ft3 rating.
Pipe
Length (ft)
size
10 20 30 40 50 60 80 100 150 200
1/2˝ 82 58 47 41 37 37 29 26 20 18
3/4˝ 192 137 112 97 87 80 69 62 48 44
1˝ 383 269 218 188 168 153 132 118 91 82
1-1/4˝ 639 456 374 325 292 267 232 208 171 148
1-1/2˝ 1260 888 723 625 559 509 440 393 320 277
2˝ 2930 2080 1700 1470 1320 1200 1040 933 762 661
Table 11. Length of Corrugated Stainless Steel Pipe.
(Refer to the ANSI Z223.1 NATIONAL
FUEL GAS CODE 2012 EDITION)
Pipe
Length (ft)
size
10 20 30 40 50 60 80 100 150 200
1/2˝ 172 118 95 81 72 65 56 50 40 34
3/4˝ 360 247 199 170 151 137 117 104 83 71
1˝ 678 466 374 320 284 257 220 195 157 134
1-1/4˝ 1390 957 768 657 583 528 452 400 322 275
1-1/2˝ 2090 1430 1150 985 873 791 677 600 482 412
2˝ 4020 2760 2220 1900 1680 1520 1300 1160 928 794
Table 12. Length of Black Iron Pipe (Schedule 40 Metallic)
(Refer to the ANSI Z223.1 NATIONAL
FUEL GAS CODE 2012 EDITION)
Page 33
Mascot FT, Heating Only, Boiler
Propane Gas Pipe Sizing (Maximum)
Intended use : Pipe Sizing Between Single-or Second-Stage (Low Pressure) Regulator and Appliance.
For reference only. Referenced from gas pipe manufacturer specications for actual delivery capacity. The
DOE standard for Natural Gas is 1100 BTU/ft3. Contact the local gas supplier for actual BTU/ft3 rating.
Inlet Pressure : 11 in. w.c / Pressure Drop : 0.5in. w.c / Specic Gravity : 1.5
Page 31
Pipe
Length (ft)
size
10 20 30 40 50 60 80 100 150 200
1/2˝ 129 91 74 64 58 53 45 41 31 28
3/4˝ 303 216 177 153 137 126 109 98 75 69
1˝ 605 425 344 297 265 241 208 186 143 129
1-1/4˝ 971 661 528 449 397 359 307 270 217 183
1-1/2˝ 1990 1400 1140 988 884 805 696 621 506 438
2˝ 4640 3290 2680 2330 2080 1900 1650 1480 1210 1050
Table 13. Length of Corrugated Stainless Steel Pipe.
(Refer to the ANSI Z223.1 NATIONAL
FUEL GAS CODE 2012 EDITION)
Length (ft)
Pipe
size
10 20 30 40 50 60 80 100 150 200
1/2˝ 291 200 160 137 122 110 101 94 84 67
3/4˝ 608 418 336 287 255 231 212 197 175 140
1˝ 1150 787 632 541 480 434 400 372 330 265
1-1/4˝ 2350 1620 1300 1110 985 892 821 763 677 543
1-1/2˝ 3520 2420 1940 1660 1480 1340 1230 1140 1010 814
2˝ 6790 4660 3750 3210 2840 2570 2370 2200 1950 1570
Table 14. Length of Black Iron Pipe (Schedule 40 Metallic)
(Refer to the ANSI Z223.1 NATIONAL
FUEL GAS CODE 2012 EDITION)
Page 34
Page 32
4.9 Gas Supply and Piping (continued)
The gas connection tting on the unit is
female NPT.
The supply line must be sized for the maximum
output of the boiler model being installed. If there
are additional gas appliances from the main
supply line, you must measure sizes of the supply
line according to the COMBINED total maximum
BTUH draw for the appliances as if they were all
operating at the same time.
Measure the length of the gas supply line from
the gas meter to the Boiler.
Use the tables in this manual or refer to the gas
line manufacturers sizing information to determine
the correct supply pipe size.
The gas shut-off valve in the gas supply line
should be installed close to the unit.
To facilitate any future maintenance, it is also
LAARS Heating Systems
3
/
˝
4
recommended that an approved gas union tting
be installed in the supply line between the shut-off
valve and the 3/
Boiler.
1) Install an approved gas line pipe to gas line
connection under the Boiler.
Include manual shut off valve and gas union
connection, as shown.
2) Test gas pressure to make sure it meets the
minimum standards and does not exceed the
maximum standards for the boiler.
3) Leak test the gas line pipe before placing the
unit in operation. Use approved leak detector
liquid solutions only to check for leaks.
Do Not Operate the boiler until all connections have
been completed, checked for leaks, and the heat
exchanger is lled with water.
˝ female NPT connection on the
4
UNION FITTING
MANUAL SHUT OFF VALVE
Figure 8. Gas Line Valve Detail
GAS PIPE
CLOSED POSITION
Page 35
Mascot FT, Heating Only, Boiler
Suggested Natural Gas (NG) Layout
Sediment
Trap
Page 33
Other Appliance
Suggested Propane Gas (LP) Layout
Sediment Trap
Gas Regulator
(Supply Press 12˝ )
LP GAS TANK
Other Appliance
Boiler must be installed downstream of the gas meter for adequate gas supply.
Boiler gas connection pipe not less than a 1/2”.
Page 36
Page 34
LAARS Heating Systems
4.10 Gas Supply Pressure
The minimum and maximum inlet gas line pressures must be
Natural Gas LP Gas
Maximum Pressure 10.5˝ WC Maximum Pressure 13.0” WC
Minimum Pressure 3.5˝ WC Minimum Pressure 8.0” WC
Gas Valve
80 - 140 MBH
Inlet Gas Pressure Port
Manifold Pressure Port
Manifold Pressure Port
Gas Valve
199 MBH
Inlet Gas Pressure Port
CAUTION
The appliance and its individual shut-off valve must be disconnected from the gas supply piping system during any
pressure testing of the system at test pressures in excess of 1/2 psi (3.5 kPa).
The appliance must be isolated from the gas supply piping system by closing its individual manual shut-off valve
during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psi (3.5 kPa).
Loosen the pressure port bolts before you check the gas inlet pressure.
Page 37
Mascot FT, Heating Only, Boiler
Document 4296B
ascot FT, Heating Only, Gas Conversion Kit
Figure C
Table B DIP Switch Settings
Per Table B, set DIP Switch
5 to OFF
for LP Propane.
Turn ON the GAS and WATER supply to the Mascot FT.
Turn ON the Mascot FT.
Connect a manometer to the manifold pressure port. For dual port manometers, use the positive pressure
side. Check for proper manifold gas pressure. Refer to Table C.
ON OFF
MIN Fire Normal Operation
MAX Fire Normal Operation
NG Natural LP Propane
3” Vent Size
2” Vent Size
ON OFF ON OFF ON
ON
OFF ON ON OFF OFF
ON
OFF OFF OFF ON ON
ON
Figure D
Gas Valve for 80 to 140 MBH
Gas Valve for
199 MBH
The gas valve on
the smaller models is
mounted vertically.
DO
NOT
CHANGE
Manifold pressure Propane Gas (LP) Natural Gas (NG)
MFTHW 80/100
-0.102˝ WC -0.102˝ WC
0.00˝ WC 0.00˝ WC
MFTHW 120/140
-0.216˝WC -0.216˝WC
0.00˝ WC 0.00˝ WC
CO2 value
Propane Gas (LP) Natural Gas (NG)
2˝ VENT 3˝ VENT 2˝ VENT 3˝ VENT
MFTHW 80/100
120/140/175/199
9.5~11% 8.5~10.5%
9~10.5 % 8~10%
Refer to the below table.
Manifold pressure Propane Gas (LP) Natural Gas (NG)
MFTHW 80/100
-0.102˝ WC -0.102˝ WC
0.00˝ WC 0.00˝ WC
MFTHW 120/140
-0.216˝WC -0.216˝WC
0.00˝ WC 0.00˝ WC
MFTHW 175
-0.169˝ WC -0.129˝ WC
-0.015˝ WC -0.015˝ WC
MFTHW 199
-0.173WC -0.134˝ WC
-0.015˝ WC -0.015˝ WC
CO2 value
Propane Gas (LP) Natural Gas (NG)
2˝ VENT 3˝ VENT 2˝ VENT 3˝ VENT
MFTHW 80/100
120/140/175/199
9.5~11% 8.5~10.5%
9~10.5 % 8~10%
Refer to the below table.
Document 4296B
ascot FT, Heating Only, Gas Conversion Kit
CO2 value
Propane Gas (LP) Natural Gas (NG)
2˝ VENT 3˝ VENT 2˝ VENT 3˝ VENT
MFTHW 80/100
120/140/175/199
9.5~11% 8.5~10.5%
9~10.5 % 8~10%
All sizes
4.11 Gas Setup and Adjustment
Page 35
For the Step by step process to measure CO
thru Step 22 in Section 4.13 of this Installation Manual.
WARNING
Installer is required to verify combustion settings as part of
the installation process.
Table15. CO2 Values
valuesontheMascotFT,pleaserefertoSteps12
2
Standard Factory Setting is for MAX Fire. 9.0%
CO2 @ 0-2,000 ft altitude (Natural Gas).
Table16. Manifold Pressures
Page 38
Page 36
4.12HighAltitudeInstallationsandOrices
The Mascot FT is shipped with a Natural Gas
Nozzle or Orice that is designed for altitudes up
to 3,000 ft. Yet the Mascot FT may be installed
(without modication) at elevations up to 10,000 ft,
as the unit will de-rate at high altitudes.
Mascot FT’s that have been converted to propane
will also de-rate at high altitudes up to 10,000 ft.
LAARS Heating Systems
Gas Line Nozzles are used
in the 80 thru 140 MBH
models
To order a specialized ‘High Altitude’ Gas Line
Nozzle or Orice to allow full rate operation,
please visit
www.laars.com/support/sales-reps.aspx
to get the contact info for your nearest Laars Sales
Representative.
See Section 4.13 for instructions to change out
the Gas Line Nozzle in the Mascot FT.
The Mascot FT does have some settings
within the Control Display that can be
adjusted to suit your installation altitude.
High Altitude settings (2,000 ~ 10,000 ft)
1. With the Power
5 seconds to get into the Installer Parameters Mode.
turned OFF, press the 'Modes button' for
A Gas Line Orice used
in the 199 MBH model
2. Turn the dial (E) until ‘33:HA’ appears.
3. Press the dial (E).
4. Set the high altitude value by turning the dial.
Refer to table.
5. Press the dial again (E) to save the setting.
6. Press the ‘Modes button’
number and to go back to initial status.
for one second, to Save the
# Altitude of Installation
0 0~1999 ft (0~609 m)
1 2,000~4,499 ft (610~1,645 m)
2 4,500~7,699 ft (1,646~2,346 m)
4 7,700~10,000 ft (2,347~3,048 m)
Page 39
Mascot FT, Heating Only, Boiler
Document 4296B
M
ascot FT, Heating Only, Gas Conversion Kit
H2375200B
Kit # R20773
The Laars Mascot FT, Heating Only, condensing
gas boiler is confi gured for Natural Gas (NG) from
the factory. If your gas supply is Propane Gas (LP),
your boiler can be converted to burn propane gas as
follows:
The Natural Gas to Propane Conversion Kit (# R20773)
included with the Mascot FT, is intended only for altitudes
less than 3000 ft. If your installation altitude is greater than
3000 ft, then please refer to Section 4.12 of the Installation
and Operating Manual (Laars Document #1342).
The Kit is supplied in a bag attached to the boiler. If
your Mascot FT does not have the bag containing the
conversion kit, a replacement kit can be obtained. Contact
the manufacturer at the address below and request a
replacement conversion kit.
This boiler has been assembled at the factory to burn
natural gas, but can be converted to burn LP gas. Be
sure to confi rm that the gas at this installation is propane
gas (LP), before performing this conversion, and then
placing the boiler into operation.
4.13NaturalGastoPropaneConversionLaarsKitDocument#4296
NOTICE
CAUTION
To convert from natural
gas to propane gas,
ON / OFF
Steps 1 thru 24
Turn OFF the Mascot FT.
1.
The ON / OFF button
is located at the bottom left of the Control Display .
Turn OFF the GAS and WATER supply to the Mascot FT
2.
(valves are located on the plumbing pipes.)
Model Nat Gas (NG) Part # Propane (LP) Part #
MFTHW
MFTHW
80
100
FT1854 FT1857
FT1855 FT1858
Page 37
Nozzles
WARNING
This conversion shall be installed by a qualified
service agency in accordance with the manufacturer's
instructions and all applicable codes and requirements
of the authority having jurisdiction. If the
information in these instructions is not followed
exactly, a fi re, an explosion or production of
carbon monoxide may result causing property
damage, personal injury or loss of life. The
qualifi ed service agency is responsible for the
proper and complete installation of this kit. The
installation is not proper and complete until the
operation of the converted appliance is checked as
specifi ed in the manufacturer's instruction supplied
with the kit. Installation must conform to local codes
and the latest edition of the National Fuel Gas Code,
ANSI Z223.1 and CAN-B149.1. Failure to follow
instructions could result in serious injury or property
damage. The qualifi ed agency performing this work
assumes responsibility for gas conversion.
MFTHW
MFTHW
MFTHW
Table A. Gas Conversion Parts
120
140
199
FT1856 FT1859
FT1083N FT1083P
FT1780 FT1802
A VERTISSEMENT
Ce conversion doit être installé par un organisme de
service conformément aux instructions du fabricant
et tous les codes et les exigences de l’autorité
compétente. Si les informations contenues dans ces
instructions n’est pas suivi à la lettre, un incendie,
une explosion ou de la production de monoxyde
de carbone mais résultat causant des dommages
matériels, des blessures ou des pertes de vie. Le
service est responsable pour la bonne et complète
l’installation de ce kit. L’installation n’est pas correcte
et complète jusqu’à ce que le fonctionnement de
l’appareil converti est vérifi ée comme spécifi é dans le
manuel d’instruction fourni avec le kit.L'installation doit
être conforme aux codes locaux et la dernière édition
du National Code de gaz combustible, ANSI Z223.1 et
peut-B149.1. Non-respect des instructions peut entraîner
des blessures graves ou des dommages matériels.
L'organisme qualifié effectuant ce travail suppose la
responsabilité de conversion au gaz.
Orifi ce
Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583
Headquarters: 20 Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com Litho in U.S.A. © Laars Heating Systems 1607 Document 4296B
pg 1 of 4
Page 40
Page 38
Customer Service and Product Support:
800.900.9276 • Fax 800.559.1583
Headquarters:
20
Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
Document 4296B
M
ascot FT, Heating Only, Gas Conversion Kit
BLOWER
GAS
VALVE
GAS
VALVE
COMBUSTION
TEST PORT
COMBUSTION
TEST PORT
COVER
BLOWER
COVER
GAS
INLET PIPE
GAS
INLET PIPE
( MFTHW
80/100120/140
) ( MFTHW
199
)
Figure A
( MFTHW
80/100/120/140
) ( MFTHW
199
)
BRASS FITTINGS
NOZZLE
BRASS FITTINGS
PACKING
PACKING
ORIFICE
3.
Using a Phillips screwdriver, remove the 4 screws on the front cover. See Figure A.
4.
Locate the Gas Inlet Pipe at the top of the unit as is shown in Figure A, and loosen the Brass Fittings at both ends
of the Gas Inlet Pipe.
5.
Completely un-thread the Brass Fittings at the blower end of the Gas Inlet Pipe, and then carefully swing the Gas
Inlet Pipe to the left, just enough so that it is out of the way . See Figure B.
6.
Remove the existing Natural Gas Nozzle (or Orifi ce). Save the Packing for re-use.
7.
Replace the old Nozzle (or Orifi ce) with the new one for LP (propane). Re-use the Packing from previous.
8.
Return the Gas Inlet Pipe to its original position and tighten both of the Brass Fittings.
Figure B
Flat Side
Inward
LAARS Heating Systems
4.13 Natural Gas to Propane Conversion (continued)
Page 41
Mascot FT, Heating Only, Boiler
Document 4296B
M
ascot FT, Heating Only, Gas Conversion Kit
ONLY.
Manifold pressure Propane Gas (LP) Natural Gas (NG)
MFTHW 80/100
-0.102˝ WC -0.102˝ WC
0.00˝ WC 0.00˝ WC
MFTHW 120/140
-0.216˝WC -0.216˝WC
0.00˝ WC 0.00˝ WC
CO2 value
Propane Gas (LP) Natural Gas (NG)
2˝ VENT 3˝ VENT 2˝ VENT 3˝ VENT
MFTHW 80/100
120/140/175/199
9.5~11% 8.5~10.5%
9~10.5 % 8~10%
Refer to the below table.
Manifold pressure Propane Gas (LP) Natural Gas (NG)
MFTHW 80/100
-0.102˝ WC -0.102˝ WC
0.00˝ WC 0.00˝ WC
MFTHW 120/140
-0.216˝WC -0.216˝WC
0.00˝ WC 0.00˝ WC
MFTHW 175
-0.169˝ WC -0.129˝ WC
-0.015˝ WC -0.015˝ WC
MFTHW 199
-0.173WC -0.134˝ WC
-0.015˝ WC -0.015˝ WC
CO2 value
Propane Gas (LP) Natural Gas (NG)
2˝ VENT 3˝ VENT 2˝ VENT 3˝ VENT
MFTHW 80/100
120/140/175/199
9.5~11% 8.5~10.5%
9~10.5 % 8~10%
Refer to the below table.
4.13 Natural Gas to Propane Conversion (continued)
Page 39
ON OFF
MIN Fire Normal Operation
MAX Fire Normal Operation
NG Natural LP Propane
REFERENCE
MBH 80 100 120 140 N/A 199
Per Table B, set DIP Switch
9.
10.
11.
12.
3” Vent Size
ON OFF ON OFF ON
OFF ON ON OFF OFF
OFF OFF OFF ON ON
DO
NOT
Table B DIP Switch Settings
CHANGE
Turn ON the GAS and WATER supply to the Mascot FT.
Turn ON the Mascot FT.
Connect a manometer to the manifold pressure port. For dual port manometers, use the positive pressure
side. Check for proper manifold gas pressure. Refer to Table C.
2” Vent Size
5 to OFF
for LP Propane.
ON
ON
ON
Figure C
Manifold Pressure Port Manifold Pressure Port
13.
Figure D
The gas valve on
the smaller models is
mounted vertically.
Gas Valve for 80 to 140 MBH
Table C
Establish a call for heat. You may need to disconnect the outdoor reset if you are making this gas
conversion during warm weather.
Headquarters: 20 Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com Litho in U.S.A. © Laars Heating Systems 1607 Document 4296B
Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583
Gas Valve for
199 MBH
pg 3 of 4
Page 42
Page 40
Document 4296B
M
ascot FT, Heating Only, Gas Conversion Kit
CO2 value
Propane Gas (LP) Natural Gas (NG)
2˝ VENT 3˝ VENT 2˝ VENT 3˝ VENT
MFTHW 80/100
120/140/175/199
9.5~11% 8.5~10.5%
9~10.5 % 8~10%
LAARS Heating Systems
4.13 Natural Gas to Propane Conversion (continued)
All sizes
Table D
Setup your combustion analyser and place the sensor into the combustion test port
14.
Per Table B for Max Fire
15.
WAIT for your combustion analyser to stabilize. This may take up to 3 minutes depending on your
16.
combustion analyser. Then measure the CO
combustion readings Do NOT adjust CO2 at MAX Fire. ONLY in MIN Fire, so...
Per Table B for MIN Fire, change dip switch 6 to OFF and 7 to ON. The unit will cycle down to MIN Fire.
17.
WAIT for your combustion analyser to stabilize. Then measure the CO
18.
acceptable MIN fi re combustion readings
Open the Gas Valve Adjustment Port by removing the cap screw with a 4mm Allen wrench.
19.
Then use the 4 mm Allen wrench to make a minor adjustment (1/8 turn) to either increase or decrease CO2.
20.
It may be necessary to go back and forth between HI Fire and LOW Fire several times (and making
21.
adjustments only at LOW Fire), before CO2 at both are within acceptable levels. Be sure to put the
adjustment port cap screw back onto the valve when done.
,
change dip switch 6 to ON and 7 to OFF. The unit will cycle up to MAX fi re.
for MAX fi re. Refer to Table C for acceptable MAX fi re
2
for MIN fi re. Refer to Table D for
2
Once the CO2 and manifold pressure measurements for both MIN and MAX Fire are acceptable per Table
22.
C, set DIP switches 6 and 7 to the OFF position for Nominal Fire (normal operation).
Write in the correct conversion date and the technicians name to the included gas conversion sticker. See
23.
Figure E. Then apply that sticker adjacent to the rating plate.
Put the boiler cover back on and assemble/tighten the 4 screws that hold the cover in place.
24.
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)___________________________________
_____________________________________________
Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583
Headquarters: 20 Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com Litho in U.S.A. © Laars Heating Systems 1607 Document 4296B
Figure E (Conversion label)
pg 4 of 4
Page 43
Mascot FT, Heating Only, Boiler
4.14 Plumbing Guidelines
Page 41
External Plumbing and Water Connection
Guidelines
- Ensure pipe material meets local codes and
industry standards.
- The pipe end must be clean and free of debris.
- Do not apply torch heat within 12˝ of the bottom
connections of the unit.
- The size of the DHW pipe should be 3/4˝
diameter and central heating water pipe should
be 1˝ diameter.
- Isolation valves(Shutoff valve) will be used.
- All piping should be insulated.
Applicable Backow Preventer
- Apply a backow preventer valve in the DHW
supply inlet (water Inlet) to the unit as required by
local codes.
CAUTION
Use at least the MINIMUM pipe size for the entire
boiler loop piping (connecting boiler to and from
the primary/secondary connection). Use only
primary/secondary piping as shown.
Failure to follow these guidelines could result in
system problems.
CH pipe minimum size : 1˝
DWH pipe minimum size : 3/4˝
Page 44
Page 42
Do not exceed 12" apart
PRIMARY LOOP
SECONDARY LOOP (SPACE HEATING)
CH SUPPLY
(SPACE HEATING)
PRIMARY/SECONDARY
CONNECTION
CH RETURN
Circulation pump
Pressure relief valve
Expansion tank
Air separator
(Closed type)
Isolation valve
Check valve
Gate valve
4.14 Plumbing Guidelines
Diaphragm type Expansion tank
LAARS Heating Systems
- The air in a diaphragm-type expansion tank is
separated from the water by a exible rubber
membrane. When the tank is installed in and
connected to the piping of the system, water
enters the other side of the tank chamber and
presses down on the diaphragm.
- You should always install an ‘Automatic Air Vent
on the top of the air separator to remove
residual air from the system.
- Automatic air vent has been installed on the
inside of the Kiturami boiler.
- The installation of additional air vent is optional.
- If the boiler is installed in a closed water supply
system, such as one having a backow preventer
in the cold water supply line, it will control thermal
expansion.
Figure 9. Plumbing Diagram using a Diaphragm Type Expansion Tank
Page 45
Mascot FT, Heating Only, Boiler
Do not exceed 12" apart
PRIMARY LOOP
SECONDARY LOOP (SPACE HEATING)
CH SUPPLY
(SPACE HEATING)
PRIMARY/SECONDARY
CONNECTION
ZONE 1
ZONE 2
ZONE 3
FLOOR HEATING
CH RETURN
Circulation pump
Pressure relief valve
Expansion tank
Air separator
(Closed type)
Isolation valve
Check valve
Gate valve
4.14 Plumbing Guidelines
Zoning with circulation pump
- Each heating zone of a pump based system has its own circulator pump which runs when the zone needs it.
- Each zone thermostat goes to a controller which controls the pumps.
Page 43
Figure 10. Plumbing Diagram using zones and circulation pumps
Page 46
Page 44
LAARS Heating Systems
4.14 Plumbing Guidelines
Zoning with zone valve
- In a valve based system, there is one circulator pump at the boiler and each heating zone has a zone
valve which opens when the zone.
- Each thermostat is wired directly to the corresponding zone valve. Contacts in the zone valves provide a
proper signal to the boiler when the valve is opened.
Gate valve
Expansion tank
(Closed type)
Air separator
Circulation pump
Check valve
Isolation valve
Pressure relief valve
PRIMARY LOOP
(SPACE HEATING)
FLOOR HEATING
ZONE 3
ZONE 2
CH SUPPLY
CH RETURN
Do not exceed 12" apart
ZONE 1
SECONDARY LOOP (SPACE HEATING)
Figure 11. Plumbing Diagram using zones and zone valves
Page 47
Mascot FT, Heating Only, Boiler
CH
SUPPLY
CH RETURN
DHW Pump
Indirect DHW Tank
DHW Pump
Pressure relief valve
Indirect DHW Tank
Isolation Valve
2-way valve
Mixing Valve
4.14 Plumbing Guidelines
Indirect Water Heating
- Installer is responsible for all equipment and detailing required by local codes.
- The minimum pipe size of CH piping should be 1˝ in diameter.
Page 45
Figure 12. Plumbing Diagram using indirect tank
Page 48
Page 46
4.15PressureReliefValve
External pressure relief valves must be installed.
Observe the following. Failure to comply with the
guidelines on installing the pressure relief valve and
discharge piping can result in personal injury , death
or substantial property damage.
WARNING
Do not operate this appliance before the
pressure relief valve supplied is installed with
sufcient relieving capacity in accordance
with the ASME Rating Plate on the boiler.
LAARS Heating Systems
This boiler is provided with 30 psi safety relief valve
that complies with the ANSI/ASME Boiler and Pressure
Vessel Code, Section IV (“Heating Boilers).(Model :
CASE ACME F-82)
This safety relief valve (30 psi) is shipped loose for eld
installation.
An approved ASME HV Pressure Relief Valve must be
installed on the DHW supply line as close to the unit
as possible. V alve size 3/4”, maximum 150 psi. Not
included with boiler.
For safety, the relief valve(s) must be installed into it’ s
designed location and not be removed or plugged.
Failure to comply with the guidelines on installing the
pressure relief valves and discharge piping can result in
personal injury , death or substantial property damage.
Direct the discharge piping of the pressure relief valve
so that hot water will not splash on anyone or any
nearby equipment. Attach the discharge line to the
pressure relief valve and run the end of the line within
6-12″ (150-300mm) of the oor.
WARNING
DO NOT install a CH pipe line relief valve with a
pressure higher than 30psi and DHW pipe line relief
valve with a pressure higher than 150psi. This is the
maximum allowable relief valve setting for the boiler.
Pressure Relief Valve must be installed on the CH
supply line & DHW outlet line as close to the unit as
possible. (CH supply line: maximum 30psi, DHW
outlet line : maximum 150psi). No other valves should
be placed between the pressure relief valve and the
appliance.
This appliance has a high-temperature shut off switch
built in as a standard safety feature .Therefore a
“pressure only” relief valve is required.
Test the operation of the valve after lling and
pressurizing system by lifting the lever. Make sure the
valve discharges freely . If the valve fails to operate
correctly , replace it with a new relief valve. Ensure that
the discharge capacity of the pressure relief valve is
equal to or greater than the maximum pressure rating
of the boiler.
Ensure that the maximum BTU/H rating on the
pressure relief valve is equal to or greater than the
maximum input BTU/H rating of the boiler.
3/4” 30psi Relief Valve
Page 49
Mascot FT, Heating Only, Boiler
4.16DisposalofCondensate
High efciency gas condensing Boilers create
condensation when operating. Condensation has
acidic (pH) of approximately 4-5.
Condensate must be drained in accordance with all
local regulations. Follow your local code with regards
to the disposal of condensation.
One of 4 disposal methods must be followed
1.tooordrain
2. to neutralizer (optional kit)
3. to laundry tub
4.tocondensatepump(eldsupplied)
If a neutralizer is installed, periodic replacement of the
lime stone (or neutralizing agent) will be required. The
rate of depletion of the lime stone varies upon usage
of the boiler. During the rst year of operation, please
check the neutralizer every few months for depletion.
Apply only corrosion-resistant materials for the
condensate drain lines such as 1/2˝ PVC, CPVC,
Polypropylene pipe or included plastic hose.
Condensate
Trap
Page 47
Condensate
drain pipe
For Category II and IV boilers, be installed so as to
prevent accumulation of condensate; and
For Category II and IV boilers, where necessary , have
means provided for drainage of condensate.
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.
Condensate is mildly acidic (pH=5), and may harm
some oor drains and/or pipes, particularly those
that are metal. Ensure that the drain, drainpipe, and
anything that will come in contact with the condensate
can withstand the acidity, or neutralize the condensate
before disposal. Damage caused by failure to install
a neutralizer kit or to adequately treat condensate
will not be the manufacturer’s responsibility.
Contact Laars to order
NeutralizerKit#A2123601
_________________________________________
NOTICE
AVIS
CAUTION
2 3
4
1
Figure 13. Various condensate disposal methods
Page 50
Page 48
LAARS Heating Systems
4.17 Electrical Wiring Connections
WARNING
Install wiring and electrically ground boiler in accordance with authority having jurisdiction or, in the
absence of such requirements, follow the National Electrical Code, NFPA 70, and/or CSA C22.1
Electrical Code-Part 1 in Canada.
ELECTRICAL SHOCK HAZARD — For your safety, turn off electrical power supply at service
entrance panel before making any electrical connections to avoid possible electric shock hazard.
Failure to do so can cause severe personal injury or death.
This appliance must be electrically grounded. Ensure the electrical receptacle that the boiler will be plugged
into, is properly grounded; if wiring directly.
Do not attach the ground wire to either the gas or the water piping as plastic pipe or dielectric unions may
isolate the Boiler electrically.
The wiring diagrams contained in this manual are for reference purposes only.
Refer to these diagrams and diagrams from external controls used with this appliance. Read, understand,
and follow all wiring instructions.
Do not disconnect the power supply when the unit is in normal operation. Damage caused by freezing is not
covered under the warranty.
Manual(Rocker) switch maximum allowable current for each circulator is 16 amps at 125VAC.
( Housing : Nylon #66 UL 94V-2 , Rocker : Nylon #66 UL 94V-2, Terminal : Copper Alloy )
Terminal block (External power connector) : DFT-20A-10P (20 amps at 300VAC)
Manual Switch
Figure 14. Electrical Connections
External Power Connections
Low Voltage Connections
( O/S : Outdoor sensor connector )
DHW and CH pump terminals for external pump are live 120V limited to 2.0 A. They operate respective to an
external call (e.g T-T) for heat.
Page 51
Mascot FT, Heating Only, Boiler
Document 4296B
M
ascot FT, Heating Only, Gas Conversion Kit
Figure C
Table B DIP Switch Settings
MBH 80 100 120 140 N/A 199
9.
Per Table B, set DIP Switch
5 to OFF
for LP Propane.
10.
Turn ON the GAS and WATER supply to the Mascot FT.
11.
Turn ON the Mascot FT.
ON OFF
MIN Fire Normal Operation
MAX Fire Normal Operation
NG Natural LP Propane
3” Vent Size
2” Vent Size
ON OFF ON OFF ON
ON
OFF ON ON OFF OFF
ON
OFF OFF OFF ON ON
ON
DO
NOT
CHANGE
REFERENCE
ONLY.
4.18 DIP Switches
DIP switches 6 and 7 have to be set in the OFF position when the boiler is running normally.
DIP switches 1, 2, and 3 are system switches and are factory set to the boiler model and size
and should not be touched.
Page 49
System Control Setting
Maximum ame detecting voltage 2.4V
Pre-purge time Tp Maximum 10s, minimum 1s
Safety Time (igniting time) Ts 1.5s
Igniting interval time 10s
Post-purge time Tip 120S (1st : 60s + 2nd 60s)
Over-heating 1,2,3 protection detection time <2s
High & Low Water Level detection time <5s
High & Low Water Level Recover time <5s
Temperature sensor anomaly detection time <3s
APS sensor detection time <3s
Page 52
Page 50
4.19ControlBoard,ElectricalDiagram
Control Board
LAARS Heating Systems
Page 53
Mascot FT, Heating Only, Boiler
4.20 Ladder Diagram
Page 51
Page 54
Page 52
4.21 Electrical Connections
Connector
#, Location, Type PIN Label
LAARS Heating Systems
Description HT SELV
CN9
65001WS-12
CN6
LW6A4-03
CN1
SMW250-05D
CN4
LWD1140-06D
CN8
SMW250-04D
CN11
LWD 1140-16
1
2 L Power Supply Line HT (120V~)
3 CP1 Central Heating Pump HT (120V~)
4 IT Ignitor HT (120V~)
5 HEAT/CP2 CH Pump HT (120V~)
6 GV Gas Valve HT (120V~)
7
8 N Power Supply Neutral HT (120V~)
9-12
1
3 HT (120V~)
1
2 RS485 - SELV (5V)
3 - 4 RS485 + SELV (5V)
5 RS485 - SELV (5V)
1
2 GND SELV (30V)
3 VDD SELV (14V)
4 Fan power(start coil) SELV (30V)
5 Fan power(end coil) SELV (30V)
6 Fan speed feedback signal SELV (14V)
1
2 ISP /Reset port SELV (5V)
3 ISP TOOL0 Data port SELV (5V)
4 VCC SELV (5V)
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
-
N
CP3 DHW Pump connection
RS-485
FAN
MCU ISP
HWL AC 24V Input Heat Demand SELV (12V~)
LWL Low Water Level Leakage Sensor SELV (12V~)
HD Central Heating Demand SELV (5V)
TH
APS Unuse -
EL Unuse -
BL Burner Limit SELV (14V)
HL Condensate Block SELV (14V)
CASE GROUND HT (120V~)
- -
AC Power COM Line HT (120V~)
HT (120V~)
RS485 + SELV (5V)
Unuse -
GND SELV (5V)
Connect to the Display
Control(Thermostat)
SELV (14V)
Page 55
Mascot FT, Heating Only, Boiler
4.21 Electrical Connections
Connector
Page 53
#, Location, Type PIN Label
CN7
LWD1140-14
1
8
2
9
3
10
4
11
5
12
6
13
7
14
F.S Flame Detect Sensor SELV (5V)
OP.S Operating water temperature sensor SELV (5V)
DH.S Exhaust temperature sensor SELV (5V)
I.S
BG.S
ST.S
SP.S CH over-heat temperature sensor SELV (5V)
Description HT SELV
CH Return temperature sensor
DHW temperature sensor or
Mechanical
aquastat connection
System temperature sensor
SELV (5V)
SELV (5V)
SELV (5V)
CN3
SMW250-06D
1
2 GND SELV (5V)
3 Voltage input SELV (5V)
4-6 FLUX1 Unuse -
APS
VCC SELV (5V)
Page 56
Page 54
LAARS Heating Systems
SECTION5.Control Display and Operation
The Control Display
E
The Control Display has a Control Dial (E), 4 buttons (A, B, C, D), and a Liquid
Crystal Display (with 72 back-lit segments). This section of this manual gives
instruction on how to navigate into the many functions of the Mascot FT and to
change temperature set points, set system variables and controller parameters.
5.1 Control Dial and Buttons
Status Light
(constant green
when operating
normally)
Buttons
A
B Modes Tap to return to menu
C
D
E
• Temperature Specications
Operating ambient Temperature Range : -10 to 60°C.
Operating Relative Humidity up to: 90% at 40°C.
Shipping & Storage Temperature Range of : -20 to 80°C.
Display Power
Heating
Water
Time / Date
Set
Scroll / Select
Turns Control Display ON/OFF
PRESS (Tap) PRESS and HOLD (5 seconds)
CH set-point change mode
(Maxium 82
Menu select or value
up(+)/down(-) or setting dial.
°C(180°F))
No Change To SET: Year/Month/Week/Day/Time/Min
Functionality
(If Display Power was On )
(If Display Power was Off ) Installer Mode
Status Display Mode
WARNING
Do not use this appliance if any part has been under
water. Immediately call a qualied service technician
to inspect the appliance and to replace any part of
the control system and any gas control that may have
been under water.
Page 57
Mascot FT, Heating Only, Boiler
Symbol Name Description
Service Reminder mode Service Reminder mode indication
Outside Temperature Mode Outside Temp setting indication
Page 55
5.2 LCD Overview
Anti-freeze mode Anti-freeze mode indication
Storage mode Storage mode indication
Information mode Information mode indication
Communication state Communication state indication
Time setting mode Time /Dispaly/Install mode indication
Fan operating mode Fan operating mode indication
Flame signal Flame Signal indication
CH pump mode CH pump mode indication
Storage pump mode Storage pump mode indication
Internal recirculation mode Internal recirculation mode indication
Celsius mode Indicated as Celsius temperature
Fahrenheit mode Indicated as Fahrenheit temperature
Heat demand mode Heat demand mode indication
DAY mode Current day mode indication
Cascade System connecting
mode
Cascade System operating mode
The LCD will illuminate when a user action is detected (a button is pressed) and will turn back off after 20 seconds.
Cascade System connecting mode
indication
Cascade System operating mode
indication
Page 58
Page 56
LAARS Heating Systems
5.3OperatingMode
Operating Mode
After the Power is turned on, and/or the Control Display is turned on , the Control Display
will go through a ‘Start Up’ checklist and briey show a sequence of diagnostic codes before
entering into the ‘Operating Mode. It will then display the following information.
B C
A D
Indicate Indicator
Current Operating Temperature Set-Point
If the Fan is operating
If a ame is detected
Celsius or Fahrenheit
Date and Time indicator
If Outside Temperature Sensor is operating
If there is a Demand for Central Heat (CH)
If CH pump state is
If Internal recirculation pump is operating
operating
E
or
If Communication state is activated
The Control Display can operate through user and service modes that have specic LCD output
and dedicated controls:
• Set-point change mode • Lock mode • Error mode • Status display mode
• Outside Temperature mode • Installer mode
* Control Display will not allow changing of button in case of lock mode activated.
Page 59
Mascot FT, Heating Only, Boiler
B C
Page 57
5.4SettingtheClock
A D
The P-950EH Control Display does NOT have a daily timer or programmable thermostat.
Setting the Clock
a. Press and hold the
then, press the dial E to Save.
b. Set the ‘MON’ (Month) by turning the dial E to the desired month number. Then press the dial E to Save.
c. Set the ‘DATE’ (1-31, Day of the Month) by turning the dial E. Then press the dial E to Save.
d. Set the ‘HOUR’ (1-24, Hour of the Day) by turning the dial
e. Set the ‘MIN’ (1-60, Minute of the Hour) by turning the dial
f. Set the ‘Day’ (Sun - Sat) by turning the dial E. Then press the dial E to Save.
‘Clock button’ for about 5 seconds. Set the ‘Year’ by turning the dial E. And
E
E. Then press the dial E to Save.
E. Then press the dial E to Save.
To Exit at any time, press and hold the
‘Clock button’ for about 5 seconds.
Page 60
Page 58
5.5CHSetPointChangeMode
CH Set point Change Mode
LAARS Heating Systems
B C
A D
TochangeCHSetpoint, press the C
CH Setpoint will ash.
Turn the E dial clockwise to increase, and counterclockwise to decrease CH setpoint, until
desired temperature is reached.
Press E dial to save changes and to Exit.
Indicate Indicator
Current CH Temperature Set-Point
Celsius or Fahrenheit
If Communication state is activated
If ame is detected
Date and Time indicator
If CH pump is operating
E
button. The CH Icon and current
or
If there currently a Demand for Central Heat (CH)
Default CH set-point is 180°F (82°C)
CH set-point range is 86°F ~180°F (30.0°C ~ 82.0°C)
Page 61
Mascot FT, Heating Only, Boiler
Status display mode
TochangeanyStatusParameter,
Page 59
5.6StatusDisplayMode
Press and Hold Button B
to get into the Status Display Mode.
Rotate Dial E until you nd the Parameter that you wish to change. Tap Dial E to enter that Parameter.
Adjust to the setting that you require and then press (tap) Dial E to save and to Exit.
B C
A D
Digital Display
O: ot Outdoor temperature Current outdoor sensor temperature
A: In 0-10 V display Current voltage of (0-10V input)
b: tt CH target temperature in cascade system
C: It CH return water temperature Current CH return water temperature
d: Fr FAN speed ( rpm) Current FAN speed ( RPM)
E: oP
F: Eh Exhaust gas temperature Current exhaust gas temperature
Status Display Parameter
CH supply temperature (Operating temperature)
E
Description
Current CH target temperature or Current
System target temperature in a cascade system
Current heating temperature
Indirect DHW tank temperature
H: dH
I: oH Overheat water temperature Current Overheat water temperature
1: PH
2: rh
L: rt
M:
CC
N: St
3: rH
4: It Cycle for ignition
5:IH
SELF Percentage of self units running. Percentage of self units running.
ALL
F1 – F
19
* If temperature sensor is not connected
then it will display with 0°F (0°C).
Time for supply power
Time for burner
operation
Burner Operation
Time
Capacity for all operating
cascade units
Capacity for individual boilers
System T emperature ( cascade
mode) * If system temperature
sensor is not connected then it will
display with 0°F (0°C).
Time for burner
operation
Cycle for ignition
Percentage of all cascade units running.
This screen shows the overal cascade power output. The
range of this value of boilers communicating with theMaster
x 100. For example, if 8 boilers are connected and
communicating, the maximum cascade power is 800%.
Range: 0-100%
Percentage of each cascade units running.
Ex. F1, F2, ….
Current System Temperature (cascade mode)
Current DHW tank temperature
Unit : 1000hour
Unit : 1hour
L: rt on display
on sub menu
Unit : 1,000hour
Cycle : 10 times the
displayed unit
Cycle : 10,000 times the
displayed unit
Page 62
Page 60
LAARS Heating Systems
5.7InstallerMode
Installer Mode. These changes are to be made only by a qualied technician.
B C
A D
TochangeanyoftheInstallerParameters,
Display Control.
Then, with the power OFF, Press and HOLD (more than 5 seconds) the Button B to get into the Installer Mode.
Rotate Dial E until you nd the Installer Parameter (full list on facing page) that you wish to change. Tap Dial E
to enter that Parameter.
Adjust to the setting that you require and then press (tap) Dial E to save and to Exit.
Finish by pressing button B
Index
Numbers
1: EH
2: cE
Error history up to 10 Check last 10 error codes (E0 - E9)
Delete Error history
Parameter Description
Select “ON” to delete error code history
Range: ON or OFF,Default OFF
E
Start by turning OFF the Power to the
3: In
4: OH
5:OL
6:cH
System initialize Select “ON” to reset to factory setting,Default OFF
When used with an outdoor sensor, sets the maximum outdoor design
temperature for the system design. Warm weather shut down will
Maximum Outdoor
Temperature
Minimum Outdoor
Temperature
Maximum Supply
temperature
disable the appliance if the programmed outdoor temperature is ex-
ceeded. Maximum outdoor temperature must be set at least 9°F above
the minimum outdoor temperature. Range: (Minimum Outdoor Tempera-
ture + 9°F) to 110°F , Default 68°F
Sets the minimum outdoor design temperature for the system. Minimum
outdoor temperature must be set at least 9°F below the maximum
outdoor temperature.
Range: -4°F to (Maximum Outdoor Temperature - 9°F), Default 5°F
Sets the maximum design supply temperature based on the minimum
outdoor design temperature. Maximum supply temperature must be set
at least 9oF above the minimum supply temperature. Range: (Minimum
Supply Temperature + 9°F) - 180°F , Default 180°F
Page 63
Mascot FT, Heating Only, Boiler
Page 61
5.7InstallerMode(continued)
Numbers
7: cL
8: OF
9: bt
10: bd
11: bI
12: FH
13: FL
14: dr
15:dI
16:Ft
17: bo
18: cb
19: db
20:PE
21: dH
22: dd
23: Pr
24: dP
25:St
26:FP
Index
Parameter Description
Minimum Supply
temperature
Warm Weather
Shutdown
Boost Function
Boost Degree
Boost Interval
Maximum Fan speed
Minimum Fan speed
Initialized burner
operation time
Initialized ignition cycle
CH Anti-Cycling time
Set differential
temperature to turn
burner “ON”
Heating capacity
DHW capacity
Heating Pump Post-
Purge Time,
T/T Satised
Indirect Storage Tank
Temperature Set Point
Indirect Storage Tank
Differential Set Point
DHW Pump Post Run
Time
DHW Priority Timer
Boiler Supply Indirect
Storage Tank
Temperature
System Freeze
Protection Mode
Sets the design supply water temperature based on the
maximum outdoor design temperature. Minimum supply
temperature must be set at least 9°F below the maximum
supply temperature. Range: 40°F to (Maximum Supply
T emperature - 9°F) , Default 86 °F
This warm weather temperature setting will shut down CH
Mode Range : 50 °F- 110°F, Default 68 °F
This function boosts CH temperature to the maximum if
set point is not reached within the set period of time.
Range: 0 - 120 min, Default 0
The boiler will add this temperature to the boiler target set
point based on outdoor reset curve. Range: 5-15°F
Default: 10°F
The boiler will index the temperature based on time
interval set on 11 bI. Range: 0-120 MIN
Default: 20 MIN
Adjusts Maximum Fan Speed
Range: -30 to +30,Default 00
Adjusts Minimum Fan Speed
Range: -30 to +30,Default 00
Select ON to Initialize burner operation time
Range: NO or YES,Default NO
Select ON to Initialize ignition cycles
Range: NO or YES,Default NO
This function delays burner operation during CH mode
Range: 0 - 20 min, Default 1
When set, the appliance will operate to heat CH water
when water temperature falls below a differential setting.
Example: If set point is 180°F and differential is 27°F, the
appliance will turn on when CH water temperature falls
below 153°F. Range: 5°F - 30°F, Default 30°F
Set Heating combustion rate Range: 50 - 100%,
Default 100
Set DHW combustion rate
Range: 50 - 100% , Default 100
Allows the user to set the appliance pump post purge time
once the thermostat is satised. Range: 1-5 minutes ,
Default 1
Sets Maximum Indirect storage tank Temperature
Range:95 - 180°F , Default 120 °F
DHW Differential Set Point
Range: 5°F-30°F, Default 7 °F
DHW Pump Post Run Time
Range: 0-10 Min , Default 1 Min
DHW Priority Timer
Range: 0 – 60 Min , Default 30 Min
Boiler Supply Indirect Tank Temperature
Range: 120 °F– 180 °F , Default 180 °F
System Freeze Protection Mode. This mode should be
turned OFF for snow melt application. NOTE: This mode
should be ON during normal operation. Range: ON/OFF
Page 64
Page 62
5.7InstallerMode(continued)
LAARS Heating Systems
Numbers
27: Cn
28: CP
29: Eh
30:Cr
31: Ct
32: Cd
33: HA
Index
Auto
Cr:Ct
AP:cP
Parameter Description
Cascade Number
Cascade Parameter
Common Vent
Automatic rotation
Cascade Rotation time
Cascade System
temperature
Cascade System
Temperature Differential
(burner ON)
High Elevation Mode
Internal CH Pump, CH
Pump and DHW Indirect
Pump Test Mode
Cascade Number
Range: 0 (Master), 1(slave 1), …., 19(slave 19)
“29: CP” has to be set with the total number of units in the
cascade before “28: Cn” can be set. Default 0
Number of units cascaded
Range: 1- 20 , Default 1
Common Vent
Range: ON / OFF, Default OFF
The rst unit to operate when there is a T/T call is the unit
that ran the least amount of time during the prior heat calls.
Cascade Rotation time
Range: 0-240 Hours, Default 48 Hours
Cascade System temperature:
Range: 9°F – 180°F, Default 180°F
Cascade System Temperature Differential (burner ON)
Range: 5°F-30°F, Default 10°F
High Elevation Mode ( 0-2, 2-5, 5-8, 8-10 ),
Default HA 0
This function sets the time to run both the Internal CH and
Internal DHW Storage pumps to purge air from the system.
Range: 1 – 30 minutes,Default 5
P1:oF or
34:AP
P1:on
P2:oF
or
P2:on
SS:Sd
35:SS
SS: br
FAH(°F)
36:UC
CEL(°C)
37: CM OFF
38: dM OFF
AquA
39: SA
SEnS
40: BP ON
Internal CH Pump and
CH Pump Test Mode
Internal CH Pump and
DHW Indirect Pump Test
Mode
Allows the user to set the
year of next service
reminder
Allows the user to set the
service reminder based
on BURNER RUN HOURS
Allows the user to
change the unit
CH Step Modulation
DHW Step Modulation
Select Aquastate
(contact) Type
Select DHW NTC
Sensor Type
Boiler Pump Allows to turn off boiler pump during DHW call.
Turn this function on to activate Internal CH and CH pump
testing. Only works in installation mode. Turns off when in
normal mode. Default OFF
Turn this function on to activate Internal CH and DHW
Indirect pump testing.
Only works in installation mode. Turns off when in normal
mode. Default OFF
Allows the user to set the year of next service reminder
XX / XX / XXXX (MONTH / DAY / YEAR)
Allows the user to set the service reminder based on
BURNER RUN HOURS
(0: OFF, 1~9000Hours) , Default 0
Allows the user to change the unit
Range: °F or °C
Allows the user to turn ON the step modulation, which
regulates burner output in six steps at one minute intervals.
Step modulation will start at the last modulation rate of the
boiler and work up one minute at a time.
Default: OFF (Selection: OFF or ON).
This mode is aquastate (contact) type.
This mode is NTC sensor type.
Page 65
Mascot FT, Heating Only, Boiler
Storage Mode / Indirect Water Heater
Page 63
5.8StorageMode
B C
A D
E
TochangeStorageModeTemp,First turn OFF the power to the Control Display.
Then Press and Hold Button B
Rota te Dial E until you nd 25:St Tap Dial E to enter Storage Mode. Storage Mode indicates that the
boiler is heating the water held in an indirect water heater. When Storage Mode is active, the display will
appear as shown.
Turn the E dial clockwise to increase, and counterclockwise to decrease setting.
Press E dial to save changes and to Exit.
Indicate Indicator
Current CH set-point of temperature
Celsius or Fahrenheit
If ame detected
to get into the Installer Mode.
or
Storage mode indication
If there is a Demand for Central Heat (CH)
Page 66
Page 64
5.9OutdoorResetAdjustment
Outdoor Reset varies the control setpoint based on
the outdoor temperature. The reset function works
as shown in Figure ‘CH Outdoor Reset’. When the
outdoor air temperature reaches 4:OH “high outdoor
temperature setpoint”, the control point setting is
adjusted to
When the outdoor air temperature reaches
outdoor temperature setpoint” the control setpoint is
adjusted to
Default outdoor reset setpoint is 100°F (38°C)
The Outdoor Temperature Mode Icon on the display
will ash if an Outdoor Sensor or 0-10 Volt is not
connected to the appliance.
See Figure15 to set your Outdoor Reset. To check
the CH Target Temperature while using Outdoor
Temperature Mode,
7:cL “low boiler temperature setpoint”.
5:OL “low
6:cH “high boiler temperature”.
LAARS Heating Systems
Operating condition
(warm weather shutdown)
Figure15. Outdoor Reset
Press the
operational and the display panel is powered on.
Connect to terminal strip as outlined 4.17 Electrical Connections.
NOTE: 0 - 10VDC terminals may not be used for both outdoor reset and 0 - 10VDC temp
setpoint simultaneously.
button while the appliance is
5.10ExternalSetPointTemperatureControl
A signal from a building management system may be connected to the appliance to enable remote
control. This signal should be a 0-10 volt DC signal. When this input is enabled, a building control
system can be used to control the set point temperature of the appliance.
The control interprets the 0-10 volt signal as follows; when the signal is between 0 and 1.5 volts, the
appliance will be in standby mode, not ring.
When the signal rises above 1.5 volts, the appliance will ignite. As the signal continues to rise
towards its maximum of 10 volts, the appliance will increase in set point temperature. Adjust 6:cH
and 7:cL to set MIN and MAX boiler water temperatures respectively.
Connect a building management system or other auxiliary control signal to the terminals marked
for this purpose on the appliance terminal block (shown in Piping Diagrams, this manual). Caution
should be used to ensure that the 0-10 VOLT + connection does not become connected to ground.
Connect to terminal strip as outlined 4.17 Electrical Connections.
NOTE: 0 - 10VDC terminals may not be used for both outdoor reset and 0 - 10VDC temp
setpoint simultaneously.
Page 67
Mascot FT, Heating Only, Boiler
Error mode
The Control Display will show the following information when an Error is presented.
Indicate Indicator
Page 65
5.11ErrorMode
Flashing
Error ‘ Er : ’ sign Segment
Error Code
If Communication state is activated
NOTE: When communication between the Control Display and the main controller is lost, the
will not be displayed.
Er:11
Page 68
Page 66
SECTION6.Error Codes
6.1 ErrorCodes
LAARS Heating Systems
Error
Code
10
11
16
20
28
32
33
Error Code
Description
Flame has
Extinguished 8 (Eight)
Times
Ignition has Failed 10
(Ten) Times
Operating
Temperature Sensor
detects Water
Temperature Greater
than 203°F (95°C)
Condensate – Closed
is Normal, Open is
Fault (Condensate
Drain Trap)
Overheat Sensor Open
or Short
DHW Sensor Open or
Short
CH Temperature
Sensor Open or Short
Possible Remedies
Press the Power button to clear the Error Code.
If Error happens again:
1. Monitor the gas pressure to the appliance while in operation. Ensure pressure is
between 3.5 and 14” WC.
2. Check gas valve wire. Ensure connection is secure.
3. Check ame detection sensor. Ensure connections are secure. Normal operating
settings are more than 2.5DC before ignition, less than 2.5DC after ignition.
4. Check vent terminations. Ensure there are no blockages.
5. Assure that the ame is stable when lit.
6. If the problem persists, replace the main control.
Press the Power button to clear the Error Code.
If Error happens again:
1. Monitor the gas pressure to the appliance while in operation. Ensure pressure is
between 3.5 and 14” WC.
2. Check gas valve wire. Ensure connection is secure.
3. Check ame detection sensor. Ensure connections are secure. Normal operating
settings are more than 2.5DC before ignition, less than 2.5DC after ignition.
4. Check igniter transformer for proper connection.
5. Clean the spark igniter with steel wool to remove oxides. Ensure proper separation (3-4 mm).
6. Replace the spark igniter if damaged.
7. Assure that the ame is stable when lit.
8. If the problem persists, replace the main control.
Press the Power button to clear the Error Code.
If Error happens again:
1. Check if dip switch Max Fire setting is ON. Switches 6 and 7 should be OFF for
normal operation.
2. Check if CH inlet pipe is blocked. Ensure there is enough water owing to the
appliance.
3. Check Operating Temperature sensor at CH heat exchanger outlet. If resistance is
zero, replace the sensor.
4. If the problem persists, replace the main control
Press the Power button to clear the Error Code.
1. Check Condensate and main controller connections. Ensure all are secure.
2. Check Condensate sensor resistance. If resistance is zero, replace the switch.
3. Check Condensate hose. Ensure it is connected and in good condition.
4. Check condensate line and termination for blockages.
5. Check Vent Pipe for blockages.
6. If the problem persists, replace the main control.
This Error Code will go away when CH temperature decreases.
If Error happens again:
1. Check overheat temperature sensor. Ensure connections are secure.
2. Check overheat sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, replace the main control.
This Error Code will go away when outlet DHW temperature decreases.
If Error happens again:
1. Check DHW outlet temperature sensor. Ensure connections are secure.
2. Check sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, replace the main control.
This Error Code will go away when CH temperature decreases.
If Error happens again:
1. Check CH temperature sensor. Ensure connections are secure.
2. Check CH sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, replace the main control.
Recover
methods
Hard
Lock
Hard
Lock
Hard
Lock
Hard
Lock
Soft Lock
Soft Lock
Soft Lock
Page 69
Mascot FT, Heating Only, Boiler
SECTION6.Error Codes (continued)
Page 67
Error
Code
35
37 Abnormal Supply Frequency
38
40
41
42 Jumped Wire Disconnected
43
44
45
61
Error Code Description Possible Remedies
Venting (Exhaust) Sensor
Open or Short
Error Appears When Control
Stores Data, but Data is not
Saved
Gas Leakage is Detected for
Greater than 5 seconds, or
three times within 10 minutes
Fan Speed too High with
Flame On
Burner Overheat Switch
Open
Air Pressure Sensor (APS)
Fault
Air Pressure Sensor (APS)
Open
Fan Speed Feedback Signal
Abnormal
This Error Code will go away when exhaust temperature decreases.
If Error happens again:
1. Check Venting (exhaust) temperature sensor. Ensure connections are secure.
2. Check sensor resistance. If resistance is zero, replace the sensor.
3. Check vent pipes for blockage.
4. If the problem persists, replace the main control
Supply frequency is too high to operate. This Error Code will go away when
supply frequency returns to normal operating range.
If Error happens again:
1. Ensure appliance is properly wired to a power source meeting the
requirements on the rating plate.
2. If problem persists, replace the main control.
Press the Power button to clear the Error Code.
Replace the main control.
IMPORTANT: If you smell gas, STOP! Follow the instructions on page 2, this
manual, and call a qualied service technician or the fuel gas utility.
Press the Power button to clear the Error Code.
If Error happens again:
1. Check the appliance cover. Ensure it is secure.
2. Check gas connections for leakage with a soapy solution. Fix any leaks.
3. Check condition of the burner assembly.
4. If the problem persists, replace the main control.
Press the Power button to clear the Error Code.
If Error happens again:
1. Check the vent connections for blockages.
2. Check the burner assembly.
3. Check fan operation. If fan appears to be operating normally but RPMs are too
high, replace the fan.
4. If the problem persists, replace the main control.
Press the Power button to clear the Error Code.
If Error happens again:
1. Ensure the jumped wire is properly connected.
2. If the problem persists, replace the main control.
Press the Power button to clear the Error Code.
If Error happens again:
1. Check burner overheat switch connections. Ensure connections are secure.
2. Check switch resistance. If resistance is zero, replace the switch.
3. If the problem persists, replace the main control.
Press the power button to reset
If error happens again:
1. Check the vent pipe for blockages.
2. Check the vent pipe for blockages.
3. If error do not clear, replace the APS
4. If the problem persists, replace the main control.
Check the aps connection.
1.If APS is closed and connections are secure, check APS connection.
2. If the problem is not happen, replace the APS
3. If the problem persists, replace the main control.
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check the connections to the fan. Ensure all are secure.
2. If the fan does not rotate during the ignition sequence, check for AC8V~26.5V
power at the fan connection. If AC8V~26.5V power is present at the control,
replace the fan. If the blower does not have AC8V~26.5V power, check power at
the control. If AC8V~26.5V power is not present at the control, replace the control.
3. If the problem persists, replace the main control.
Recover
methods
Soft Lock
Soft Lock
Hard Lock
Hard Lock
Hard Lock
Soft Lock
Hard Lock
Hard Lock
Soft Lock
Soft Lock
Page 70
Page 68
SECTION6.Error Codes (continued)
LAARS Heating Systems
Error
Code
70
72
76
78 Cascade Error Please refer to Laars Document 1349 for Cascading the Mascot FT.
80
81 Low Water Level Circuit
85
94
Error Code Description Possible Remedies
Register, Ram, Rom, I/O
Port, AD Abnormal, Important
EPROM Data or Safe Data
Abnormal
Flame Signal Detected before
Ignition
Poor Communication
(Control Display)
Low Water Level Sensor
(Low Water Level Detected
Four (4) Consecutive times)
Freeze Protection
(Appliance has detected
water temperature below
34°F(1°C)
Exhaust Sensor detects Vent
Temperature is Greater than
190oF (88oC)
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Turn power OFF and ON at the main power switch internal to the appliance.
2. If the problem persists, replace the main control.
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check th e applianc e cover. Ensure it is secu re. Flame detec tion sens or can detec t
an external light source.
2. Check f lame detect ion sensor. Ensure co nnection s are secure. No rmal oper ating
settings are more than 2.5DC before ignition, less than 2.5DC after ignition.
3. If the problem persists, replace the main control.
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check connections from main control to display panel.
2. If the problem persists, replace the display and/or the main control.
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Ensure all valves are open to the appliance and there are no leaks.
2. Ensure all air has been purged from the system.
3. Check wiring connections to low water level sensor. Ensure all are secure.
4. Check low water level sensor resistance. If resistance is zero, replace the sensor.
5. If the problem persists, replace the main control.
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Ensure all valves are open to the appliance and there are no leaks.
2. Check wiring connections to low water level sensor. Ensure all are secure.
3. Check low water level sensor resistance. If resistance is zero, replace the sensor.
4. If the problem persists, replace the main control.
This Error Code will go away when the freezing condition is remedied.
If Error happens again:
1. Ensure appliance is located in a mechanical room protected from freezing conditions.
2. Ensure all valves are open to the appliance, there are no leaks.
2. Check wiring connections to low water level sensor. Ensure all are secure.
3. Check low water level sensor resistance. If resistance is zero, replace the sensor.
4. If the problem persists, replace the main control.
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check if dip swi tch Max Fire s etting is O N. Switche s 6 and 7 should b e OFF for
normal operation.
2. Check exhaust temperature sensor. Ensure connections are secure.
3. Check sensor resistance. If resistance is zero, replace the sensor.
4. Check exhaust vent for blockage.
5. If the problem persists, replace the control.
6. If the problem persists, replace the heat exchanger.
Recover
methods
Soft Lock
Soft Lock
Soft Lock
Soft Lock
Soft Lock
Soft Lock
Soft Lock
Page 71
Mascot FT, Heating Only, Boiler
6.2FaultTreeAnalysis
1. Flame detection
Page 69
Page 72
Page 70
6.2FaultTreeAnalysis
2. Gas Detection
LAARS Heating Systems
3. ‘Storage’, ‘DHW’, ‘OP’, ‘CH overheat’, ‘Exhaust heat’ Sensor detects
Error code contents
E28 DHW NTC open or short
E33 OP NTC open or short
E35 Exhaust NTC open or short
Page 73
Mascot FT, Heating Only, Boiler
Page 71
SECTION 7. Trouble Shooting
Question Answer
Make sure that the ON/OFF button on the Control Display has been turned
ON.
If the monitor on the Control Display is blank, make sure the power cord is
plugged and 4A fuses on the main controller in the units are good.
Burner dose not ignite
when the hot water is
opened.
Water is not hot enough.
Make sure that there is water supplied to the unit. The unit activates once
the inlet water ow is over 0 gpm.
Make sure the cold and hot water lines are not plumbed in reverse side.
Make sure that the cold water and gas supply lines are opened.
Make sure that the water lines are not frozen.
Check that the setting temperature on the unit is not too low
Make sure that the lter in the cold water supply line is not clogged with
debris.
Make sure that the gas supply type is correct.
Check the supply and manifold gas pressures are in accordance with
specications.
Make sure that the water ow sensor with three wires has been properly
connected on the top of heat exchanger.
7.1 Diagnostics
Water is too hot.
Hot water temperature
uctuates at the opened
tap.
The blower is still
operating after the
combustion stops.
Temperature Rise
too Quickly
Abnormal sounds come
from unit during operation.
Make sure that the setting temperature on the unit is not too hot.
Make sure that the lter in the cold water supply line is not clogged with
debris.
Make sure that the gas supply type is correct.
Make sure that the lter in the cold water supply line is clean.
Make sure that the gas supply type is correct.
Check the supply gas pressure is sufcient.
This is normal because the blower keeps operating for 1 minute to vent
(exhaust) the ue gas from the chamber once the combustion has
stopped.
Occurs when supply water temperature in heat exchanger rises faster
than 2°F per second during the rst two minutes the burner is on.
Automatically resets after a few minute delay or using manual reset on
Control Display. See message displayed TEMPERATURE SENSOR and
follow procedure for loose connections.
A leak of combustion gas between sealed chamber and exhaust tube
inside the unit. Call a qualied service technician for evaluation.
Improper venting termination, make sure that the venting termination
complies with specication.
Check the supply gas pressure is sufcient. Insufcient gas pressure will
cause unstable burner ame and noise.
Page 74
Page 72
LAARS Heating Systems
7.2 Suggested Corrective Actions
This controller is able to record information about the boiler’s condition at the time of the ve previous faults or
errors. Refer to the Section ‘5.10 Error Mode’ of this manual.
Display Condition Diagnostic Corrective Action(s)
Nothing shown
on display
Control Display
and blower
running at full
speed.
Nothing is shown
in display Control
Display and no
other boiler
components are
operating.
Control is not
receiving power.
Control is not
receiving 120V power.
Check wiring for short
circuit or incorrect
wiring.
Check transformer
connection to the
control per wiring
diagram. Check for
12V output of
transformer.
Check service switch
and/or circuit breaker
to boiler turned is on.
Is there 120 Volts at
the service switch?
Is the ON/OFF
POWER
SWITCH (inside boiler
case) turned on?
Check for 120 volts at
the line voltage
terminal block located
inside the boiler case.
Correct wiring per wiring diagram
including connection of transformer to
the control.
Replace transformer if it is receiving
120V, but not outputting 12Vac.
Turn on service switch to power boiler.
Troubleshoot and correct the power
supply to the manual switch.
Turn ON the manual power switch
inside the boiler case.
Correct wiring inside the boiler case
using the wiring diagram in this
manual.
Nothing is shown
on
Control Display,
but boiler is
operating.
Occurs when the
communication is lost
from the control to the
display.
Inspect the fuse.
Replace if necessary.
Check for loose
connections and
proper pin alignment/
engagement on the
Control's plug.
Cycle power off and on
using boiler power
switch and check for
operation.
Replace the fuse with proper part
found in the replacement part section
of this manual. If fuse blows again
recheck wiring per diagram.
Check for continuity on the wire
harness from the display to the control.
See repair parts section for proper
replacement part.
Replace with new display module. See
repair parts section for proper
replacement part.
Page 75
Mascot FT, Heating Only, Boiler
7.2 Suggested Corrective Actions (continued)
Fault Condition Diagnostic Corrective Action(s)
Occurs when a
temperature
TEMPERATURE
SENSOR
FLAME FAULT
sensor has
electrically
shorted
(SHORT) or has
become
disconnected
(OPEN).
Occurs when
ame is
detected when
there should be
no ame.
Reset using manual
reset screen on
Control Display.
(Power button)
Reset using manual
reset screen on
Control Display.
(Power button)
Page 73
Check all the temperature readings of
the boiler on the DIAGNOSTICS
- TEMPERATURES menu to determine
if any sensors are currently displayed
as SHORT or OPEN.
Check wire harness for loose
connections and pin engagement at
sensor Connection and Control
module.
If problem persists after checking items
above replace Control. Refer to repair
parts section for kit number.
Burner may be operating too hot due
to incorrect combustion. Inspect ame
and conduct combustion test.
Check for ame at burner via ame
current with burner off. Turn boiler off
and watch ame through observation
port. If ame continues after shutdown
replace gas valve.
Check wire harness for loose
connections and pin engagement at
blower.
Connections.
BLOWER FAULT
IGNITION
FAULT
GAS VALVE
FAULT
Blower unable
to reach
required speed
or does not
reach 0 RPM
when turned off.
Even if boiler
went through 8
ignitron
attempts, but
cannot detect
ame
The Control has
detected a
problem with it
gas valve
output circuit.
Reset using manual
reset screen on
Control Display.
(Power button)
Power off and on.
Reset using manual
reset screen on
Control Display.
(Power button)
Boiler in standby mode and blower not
running. If BLOWER SPEED is not 0
RPM then replace blower.
If blower does not rotate during ignition
sequence check for 120V power at
blower connection. If 120Vac power at
blower motor and it doesn't start
replace blower. Check power at
Control. If 120Vac is not present at
Control when boiler is powered replace
Control.
Dirty burner and/or heat exchanger will
cause high back pressure and poor
ignition.
Visual inspection of ue ways often will
not be able to diagnose condition.
Check incoming gas pressure with
boiler off and at Max re. Adjust within
limits on rating label.
Check for ue pipe and intake pipe
restrictions or blockage
Check burner fasteners and gaskets
Check air intake pipe and proper
propane orice
Check wire harness connections
between gas valve and Control.
If lockout re-occurs replace Control.
Page 76
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LAARS Heating Systems
SECTION 8. Maintenance
Regular Maintenance
- This Manual should be placed in a safe and dry
location near the Boiler. Maintenance instructions
should be carried out by the following guidelines.
Maintenance procedures [ Daily ]
- Check that the boiler casing is closed.
Check if there is any problem with the Boiler casing
and the two upper and lower screws are tightened
well. Boiler casing must be closed while it is
running.
WARNING
To prevent potential severe personal injury,
death or substantial property damage,
remove all contaminated materials.
If contaminants are found:
Remove products immediately from the area.
In order to check the status of Boiler, call
a qualied service technician to inspect
the Boiler for possible damage from acid
corrosion.
WARNING
DO NOT store combustible materials, gasoline
or any other ammable vapors or liquids near
the Boiler. Remove them immediately or store
them other places.
8.1 Annual startup & general maintenance
- Check the power source.
Make sure that the power cord is correctly
connected. The main power line is connected to
the manual switch box inside a Boiler. (Power line
through the strain relief in the bottom of the boiler
casing and x it.)
- Check the status of the Control Display
Check status of the power supply. Please check for
any debris on the button.
Maintenance procedures [ Monthly ]
- Check the vent pipe.
Visually inspect the ue gas vent piping for detecting
any signs of blockage, leakage or deterioration
of the piping. Please contact a qualied service
technician immediately if you nd any problem.
- Check the air inlet pipe.
Visually inspect the air inlet to be sure it is
unobstructed. Inspect entire length of air piping
for ensuring that piping is intact and all joints
are properly sealed. Call your qualied service
technician if you notice any problems.
- Check the relief valve.
Inspect the Boiler relief valve and the relief valve
discharge pipe for any signs of weeping or leakage.
If the relief valve often weeps, immediately contact
your qualied service technician for inspecting the
Boiler and system.
- Check the condensate outlet.
While the Boiler is running, check the discharge end
of the condensate drain tubing.
Make sure that no ue gas is escaping from the
condensate drain tubing.
If ue gas is continuously escaping, it is a serious
problem. Call your qualied service technician for
inspecting the Boiler and condensate line. Also, rell
the condensate trap if problem persists regularly.
- Check the vent terminal screen vent (rodent
screen).
If you encounter a problem of combustion
specications, visually inspect the terminal screen.
And then replace it with spare parts or clean the
screens.
Page 77
Mascot FT, Heating Only, Boiler
- Check the air vent
If the air vent valve seems to work freely without
leaking, replace cap “A” by twisting all the way on.
Loosen cap “A” one turn to allow vent to operate.
If vent does not operate correctly, replace the vent.
A
Maintenance procedures [Every 6 Months]
- Check the boiler piping (gas and water)
Visually inspect for leaks around internal water
piping. Also inspect external water piping,
circulators, relief valve and ttings. Immediately
call a qualied service technician to repair any
leaks. Leaks must be xed by a qualied service
technician immediately.
Failure to comply with this instruction could result in
severe personal injury, death or substantial property
damage.
Page 75
8.1 Annual startup & general maintenance
lever completely, the valve or discharge line may be
blocked. Shut down the Boiler immediately. Call your
qualied service technician to inspect the boiler and
system.
- Check the burner state
You can clean the exterior of burner. However, if you
need to clean the inside of the burner stage, you
should call an expert.
- Check the operate relief valve
WARNING
Leaks must be xed by a qualied service technician
immediately. Failure to comply with this instruction
could result in severe personal injury, death or
substantial property damage. This discharge line
must be installed by a qualied heating
installer or a service technician.
Before proceeding the procedures, verify that relief
valve outlet has been piped to a safe place of
discharge, avoiding any possibility of scalding from
hot water. If water ows freely, release the lever
and allow the valve to seat. Watch the end of the
relief valve discharge pipe to ensure that the valve
does not weep after the line has had time to drain.
If the valve weeps, lift the seat again to attempt
to clean the valve seat. If the valve continues to
weep, contact your qualied service technician for
inspecting the valve and system. If water does not
ow from the valve even though you have lifted the
Page 78
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LAARS Heating Systems
8.2 Flushing the Boiler
- Flushing the Boiler
Flushing the Heat Exchanger of boiler is a complicated procedure. Refer to the following instructions carefully
before attempting the procedure. If you do not understand about the procedure, contact an authorized technician or licensed professional. Keep in mind that improper maintenance can void your warranty.
1. Disconnect electric power to the boiler.
2. Close the shutoff valves on both hot water outlet
and cold water inlet lines. (V1 & V2)
3. Connect one hose “D1” to the valve “V3” and
V3
V4
V2
V1
place the free end in the bucket. Connect one
of the hoses “D3” to the circulation pump outlet
and the cold water inlet line at the valve “V4”.
Connect other hose “D2” to the circulation pump
inlet and place the free end in the bucket.
4. Pour the cleaning solution into the bucket.
Place the drain hose (D1) and the hose (D2) to the
pump inlet into the cleaning solution.
5. Open service valves (V3 & V4) on the hot water
outlet and cold water inlet lines.
6. Turn on the circulation pump (Operate the pump and
allow the cleaning solution to circulate through the
boiler for at least 1 hour at a rate of 4 gallons per
minute.)
7. Rinse the cleaning solution from the boiler as follows:
- Remove the free end of the drain hose (D1) from
the bucket.
- Close service valve, (V4), and open shut off valve,
(V2).
Do not open shut off valve, (V1).
- Allow water to ow through the boiler for 5 minutes.
- Close shut off valve (V2).
8. Disconnect all hoses.
D1
D2
D3
9. Remove the cold water inlet lter from the boiler and
clean out any residues.
10. Reinsert the lter and ensure the lter cap is
securely tightened.
11. Connect electrical power to the boiler.
Page 79
Mascot FT, Heating Only, Boiler
SECTION 9. Installation Check
Page 77
9.1 Quick View
Before Installing
- Make sure that there is enough space for
installing Water and gas line.
Verify vent/air termination is located as required.
- All models need for propane Conversion which
requires a separate gas conversion manual.
Install Water Piping
- Boiler loop piping must be sized to the minimums
listed in the Boiler manual. Using smaller piping
will cause performance problems.
Install Vent & Air Piping
- Slide the air inlet pipe and vent pipe into the
Boiler pipe connector.
- Make sure the terminations are placed as
required in the manual and that air intakes are at
least 12 inches above normal snow line.
- Refer to the material check list in this guide for a
list of items needed.
Install Condensate Piping / Tubing &
Components
- Fill out the material check list in this guide to
ensure you have the tubing or PVC pipe and all
components needed for the condensate piping.
- Connect internal components that are supplied
with the Boiler.
Install Gas Piping
- Install a union and shutoff valve.
Wire the Boiler
- Connect power wiring and control wiring per
boiler manual wiring diagram.(Section 4.19)
Start up, Adjust & Test
- Follow the Boiler manual instructions to clean
the system if needed, then ll and check water
chemistry.
9.2 Final Check Lists
Final check : Installation Conditions.
• Is the Boiler properly mounted on the wall?
• Is there space for a drain which is close to the
Boiler?
• Are there any combustible materials near the
Boiler and vent pipe?
• Is the air supply sufcient for proper operation of
the Boiler?
• Are the proper service clearances maintained?
• Is the distance between the Boiler and point of
vent termination minimized?
• Is the proper distance from windows, doors, and
other intake vents maintained?
Final check : Gas pipe installation
• Is the gas supply line equipped with a manual
shut off valve?
• Is the gas supply line a minimum of 3/4˝ inner
diameter?
• Is the gas supply line length and diameter
adequate to deliver the required BTU’s?
• Has the gas supply line pressure been
measured?
• Does the supply gas type match the type
indicated on the boiler rating plate?
Final check: Air/Vent pipe installation
• Has the Boiler been vented with 3˝ or 2” PVC,
CPVC, Polypropylene or BH Special
Gas Vent (S636 PVC, CPVC) for Category IV
appliances in accordance with this manual and/or
your local code?
• Is the vent termination at least 12˝ above the
exterior grade?
• Is the total vent length within the maximum vent
length restriction?
• Have you checked the air/vent piping for leaks?
• Have you properly supported the vent
termination?
• Are all vent runs properly supported?
• Is the vent sloped upward toward the vent
termination at a rate of 1/4˝ per foot (2% grade)?
Final check : Condensate drain installation
• Have you installed a condensate drain line from
the Boiler to a drain or laundry tub?
Final check : Setting the DIP switches
• Are all DIP switches correctly set on the main
board?
Page 80
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LAARS Heating Systems
9.2 Final Check Lists (continued)
Final check : Connecting the power supply
• Please check that the power is 120V AC.
• Have you checked the polarity of the electrical connection?
Final check : Pressure relief valve
• Have you installed an approved pressure relief valve on the boiler?
• Is the pressure relief valve of CH Plumbing at least 1˝ in diameter?
• Is the pressure relief valve of DHW Plumbing at least 3/4˝ in diameter?
• Have you installed the pressure relief valve on the hot water outlet pipe near the Boiler?
Final check : Burner ames
• The burner ame must be checked periodically for a constant proper blue color.
• If the ame does not appear normal, the burner may need to be cleaned.
• If the burner needs to be cleaned, it must be performed by a qualied service technician.
Sight Glass
Blue ame
Page 81
Mascot FT, Heating Only, Boiler
Page 79
Page 82
Page 80
Casing Parts (80 MBH to 140 MBH)
No Description Part Number
2
O-Ring P7 FT1601
B-4
Bolt(M4*8 TH) FT1614
B-6
Bolt(M4*10 FH) FT1544
B-7
Bolt(M4* 10 TH) FT1719
B-9
Bolt(M4*10 Flat) FT1545
B-11
Bolt(M4*12 TH) FT1534
B-14
Bolt(M4*20 TH) FT1546
B-15
Bolt(M4*16 TH) FT1547
7
Exhaust Vent Duct Ass’y FT1002
7-1
Stainless band FT1603
7-2
Packing FT1604
7-3
Exhaust vent duct FT1605
7-4
Exhaust testing cap FT1606
7-5
O-Ring P85 FT1607
7-6
Exhaust vent adaptor (inside) FT1608
7-7
O-Ring P75 FT1609
8
Air Inlet Duct Ass’y FT1010
8-1
Air Inlet Duct FT1611
8-2
Air Inlet adaptor (inside) FT1612
9
Air Vent FT1321
10
Air Vent adpator FT1548
11
Air vent rubber cap FT1013
12
Control Bracket FT1049
13
Air pressure switch FT1015
14
Ignition Transformer ST1006
15
Control sub-bracket FT1050
16
Bracket FT1051
17
PCB Control NGTB-900CP FT1052
18
Display Contol P-950EH FT1053
19
Power Switch FT1020
20
Condensate Blockage, Air Press Switch FT1022
21
Terminal Block (6P) FT1021
22
Terminal Block (12P) FT1618
23
Front Cover FT1054
24
Control Display cover / window FT1024
25
Bracket FT1055
Casing Ass’y (80,100K) FT1851
26
Casing Ass’y (120,140K) FT1056
27
Bracket(Down) FT1057
28
Wire adaptor FT1633
29
Pressure gauge FT1058
30
Condensate trap cover FT1059
LAARS Heating Systems
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Mascot FT, Heating Only, Boiler
Page 81
Page 84
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LAARS Heating Systems
Heat Exchanger Parts (80 MBH to 140 MBH)
No Description Part Number
2
O-Ring P7 FT1601
3
O-Ring P22 FT1514
4
0.3” Packing FT1060
5
3/4” Packing FT1646
6
1” Packing FT1691
N-1
M4 Nut FT1061
B-1
M3*6 PH FT1062
B-3
M4*8 PH FT1063
B-5
M4*8 TH FT1520
B-7
M4*10 TH FT1719
B-8
M4*10 TH FT1064
B-12
M4*14 PH FT1065
B-13
M4*14 PW FT1066
31
Exhaust Pipe FT1067
32
Exhaust sensor BK FT1529
33
Exhaust overheat sensor FT1307
34
Piping connector (down) FT1666
Heat Exchanger Ass'y (80,100K) FT1852
35
Heat Exchanger Ass'y (120,140K) FT1068
35-1
Burner Ass’y FT1309
35-2
Overheat sensor FT1310
35-3
Burner upper case FT1658
35-4
Ceramic Paper(TBD) FT1659
35-5
Burner FT1314
35-6
Burner case sealing O-ring FT1661
35-7
Ingiter FT1315
35-8
Ignitor Gasket FT1316
35-10
Refractory FT1665
38
Flame detector sensor Cover FT1069
39
Flame detector sensor FT1327
40
Flame detector sensor BK FT1669
Outlet Pipe (80,100K) FT1853
41
Outlet Pipe (100,140K) FT1070
42
CH return Pipe-1 FT1071
43
Pump FT1672
44
CH return sensor FT1635
45
CH return Pipe-2 FT1072
46
Condensate Trap Ass’y FT1073
47
Condensate Drain Hose FT1329
48
Clamp Φ23 FT1682
49
Condensate trap connector FT1330
Page 85
Mascot FT, Heating Only, Boiler
Page 83
Page 86
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LAARS Heating Systems
Blower Parts
(80 MBH to 140 MBH)
No Description Part Number
N-2
M5 Nut FT1074
B-2
M3*12 PH FT1075
B-5
M4*8 TH FT1520
B-6
M4*10 FH FT1544
B-8
M4*10 TH FT1064
B-10
M4*12 PH FT1076
B-16
M5*14 FT1077
50
Stainless Band (Φ60) FT1078
51
Intake Hose FT1533
52
Intake silicon adaptor FT1713
53
Fan Guide FT1079
54
Damper Packing FT1080
55
Damper Body FT1081
56
Fan rubber packing FT1082
Fan Assemby, FT 80 FT1862
Fan Assemby, FT 100 FT1863
57
Fan Assemby, FT 120 FT1864
Fan Assemby, FT 140 FT1405
Intake Orice, FT 80 FT1865
Intake Orice, FT 100 FT1866
57-2
Intake Orice, FT 120 FT1867
Intake Orice, FT 140 FT1535
57-3
Gas Mixer housing FT1409
57-4
Fan sealing O-Ring ST1038
Nozzle (natural / 80K) FT1854
Nozzle (natural / 100K) FT1855
58A
Nozzle (natural / 120K) FT1856
Nozzle (natural / 140K) FT1083N
Nozzle (LP / 80K) FT1857
Nozzle (LP / 100K) FT1858
58B
Nozzle (LP / 120K) FT1859
Nozzle (LP / 140K) FT1083P
59
1/2” Packing FT1421
Gas Pipe(upper / 80,100K) FT1860
60
Gas Pipe(upper / 120,140K) FT1084
61
Gas Valve Ass’y FT1413
61-1
Gas Valve outlet adaptor FT1728
61-2
Gas Valve O-Ring FT1727
61-3
Gas Valve FT1537
61-4
Gas valve inlet adaptor FT1538
61-5
Gas valve bracket FT1539
62
Gas Pipe (lower) FT1086
63
Gas Inlet adaptor FT1087
Page 87
Mascot FT, Heating Only, Boiler
Page 85
Page 88
Page 86
Casing Parts (199 MBH)
No Description Part Number
2
O-Ring P7 FT1601
B-4
M4*8 TH+ tapping FT1614
B-6
M4*10 FH+ M/S FT1544
B-7
M4*10 TH+ tapping FT1719
B-9
M4*10 FH FT1545
B-11
M4*12 TH+ M/S FT1534
B-15
M4*16 TH+ tapping FT1547
7
Exhaust Vent Duct Ass'y FT1002
7-1
Stainless band FT1603
7-2
Packing FT1604
7-3
Exhaust Vent Duct FT1605
7-4
Exhaust testing cap FT1606
7-5
O-Ring P85 FT1607
7-6
Duct adaptors (inside) FT1608
7-7
O-Ring P75 FT1609
8
Air Inlet Duct Ass’y FT1010
8-1
Air Inlet Duct FT1611
9
Air vent FT1321
10
Air vent adaptor FT1548
11
Air vent rubber cap FT1013
12
Air pressure sensor FT1015
13
Control bracket FT1751
14
Ignition transformer ST1006
15
Control sub bracket FT1752
16
Control Display (P-950EH) FT1620
17
Bracket FT1753
18
Condensate blockage, air press switch FT1022
20
power switch FT1020
21
Terminal block (10P) FT1021
22
Terminal block (12P) FT1618
23
Front cover FT1754
24
Control Display cover/window FT1024
25
Wire adaptor FT1633
26
Pressure gauge FT1058
25
Bracket (upper) FT1055
27
Intake/Exhaust sealing pad FT1771
29
Case Ass'y FT1755
30
Bracket (lower) FT1057
LAARS Heating Systems
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Mascot FT, Heating Only, Boiler
Page 87
Page 90
Page 88
Heat Exchanger Parts
(199 MBH)
No Description Part Number
2
O-Ring P7 FT1601
3
O-Ring P22 FT1644
4
0.3" Packing FT1060
5
3/4" Packing FT1646
6
1” Packing FT1691
B-1
M3*6 PH+ M/S FT1062
B-3
M4*8 PH+ tapping FT1063
B-4
M4*8 TH+ tapping FT1614
B-5
M4*8 TH+ M/S FT1520
B-7
M4*10 TH+ tapping FT1719
B-8
M4*10 TH+ M/S FT1064
B-11
M4*12 TH+ M/S FT1534
B-12
M4*14 PH+ tapping FT1065
31
Exhaust overheat sensor FT1307
32
Exhaust sensor Bracket FT1306
33
Exhaust pipe FT1756
34
Exhaust pipe packing (lower) FT1757
35
Heat exchanger ass'y FT1758
35-1
35-2
35-3
35-4
35-5
35-6
35-7
35-8
Burner Ass'y FT1759
Burner upper case FT1760
Burner packing FT1761
Burner FT1762
Ignitor FT1763
Ignitor gasket FT1316
overheat sensor FT1310
Burner down case FT1764
36
Temperature sensor FT1324
37
Low level sensor FT1325
38
Flame detector bracket FT1669
39
Flame detector sensor FT1327
40
Flame detector sensor cover FT1069
41
CH Outlet pipe FT1765
42
CH Return pipe 1 FT1766
43
Pump FT1767
44
CH return sensor FT1635
45
CH Return pipe 2 FT1768
46
Condensate trap ass'y FT1783
LAARS Heating Systems
Page 91
Mascot FT, Heating Only, Boiler
Page 89
Page 92
Page 90
Blower Parts (199 MBH)
No Description Part Number
N-2
M5 NUT FT1074
B-2
M3*12 PH+ tapping FT1075
B-5
M4*8 TH+ M/S FT1520
B-10
M4*12 PH+ M/S FT1076
47
Fan guide FT1769
48
Damper packing FT1770
49
Damper body FT1081
50
Fan rubber packing FT1082
51
Fan guide packing FT1772
52
Fan ass'y FT1405
52-1
Fan FT1406
52-2
Fan sealing O-Ring ST1038
52-3
AGM venturi FT1773
52-4
AGM O-Ring FT1774
52-5
AGM Body FT1775
53
Stainless band FT1603
54
Intake hose FT1776
55
Stainless band FT1777
56
Intake adaptor FT1713
57
Gas Valve ass'y FT1778
57-1
Gas valve outlet FT1728
57-2
Gas valve O-Ring FT1727
57-3
Gas valve FT1750
57-4
Gas valve inlet FT1538
57-5
Gas valve bracket FT1779
58
1/2" Packing FT1421
Nozzle (natural) FT1780
59
Nozzle (LP) FT1802
60
Gas pipe upper FT1781
61
Gas pipe lower FT1782
62
Gas inlet adaptor FT1087
LAARS Heating Systems
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Mascot FT, Heating Only, Boiler
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Mascot FT, Heating Only, Boiler
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Notes:
LAARS Heating Systems
All Manuals (Install &
Operate,
Service Manuals) can
be downloaded at
StartUp,and
www.laars.com
For LAARS Product
and Service VIDEOS
https://www.youtube.
com/user/LaarsHeating
Dimensions and specications subject to change without notice in accordance with our policy of continuous product improvement.
H2375000E
Customer Service and Product Support: 800.900.9276•Fax800.559.1583
Headquarters: 20IndustrialWay,Rochester,NH,USA03867•603.335.6300•Fax603.335.3355
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com Litho in U.S.A. © Laars Heating Systems 1609 Document 1342E
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