Laars MFTHW Installation And Operation Instructions Manual

Installation and Operation Instructions Document 1318

Installation and Operation

Instructions for

M

ASCOT

®

FT

Wall-Mounted, Modulating

Gas, Condensing, Combination Boiler

Model MFTCW

140,000 BTU/hr

•

Natural Gas (NG) - Factory Configuration

•

Propane Gas (LP) - Field-Convertible

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water boiler and heater installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death. Improper installation and/or operation will void the warranty.

WARNING

If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

Do not store or use gasoline or other flammable 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 fire department.

Installation and service must be performed by a qualified installer, service agency, or gas supplier.

AVERTISSEMENT

Assurez-vous de bien suivres les instructions données dans cette notice pour réduire au minimum le risque d’incendie ou d’explosion ou pour éviter tout dommage matériel, toute blessure ou la mort.

Ne pas entreposer ni utiliser d’essence ou ni d’autres vapeurs ou liquides inflammables dans le à proximité de cet appareil ou de tout autre appareil.

QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE

GAZ:

• Ne pas tenter d’allumer d’appareils.

• Ne touchez à aucun interrupteur. Ne pas vous servir des téléphones dans le bâtiment où vous vous trovez.

• Appelez immédiatement votre fournisseur de gaz depuis un voisin. Suivez les instructions du fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de gaz, appelez le sservice des incendies.

L’installation et l’entretien doivent être assurés par un installateur ou un service d’entretien qualifié ou par le fournisseur de gaz.

LAARS Heating Systems

SECTION 1

SECTION 2

TABLE OF CONTENTS

Product Accessories

1.1 Introduction ........................................................... 1

1.2 Included with the Appliance ................................... 1

4.17 DHW Flow Restrictors .........................................40

4.18 Electrical Wiring Connections ............................ 41

4.19 DIP Switches ...................................................... 42

4.20 Control Board, Electrical Diagram ...................... 44

4.21 Ladder Diagram ................................................. 45

4.22 Electrical Connections ........................................ 46

Product Characteristics

2.1 Model Nomenclature ............................................. 2

2.2 Specifications ........................................................ 3

2.3 Dimensions ........................................................... 4

2.4 Names of Components ......................................... 5

2.5 Product Flow and Characteristics ......................... 6

2.5.1 Central Heating Flow ....................................6

2.5.2 Domestic Hot Water Flow.............................7

SECTION 3

Safety Regulations

3.1 Safety Symbols ..................................................... 8

3.2 Safety Precautions and Proper Use .................... 10

SECTION 4

Installation

4.1 Location and Clearances .....................................12

4.2 Wall Mount Bracket ..............................................13

4.2.1 Installation Height and Location .................13

4.2.2 Hang the Boiler ..........................................13

4.3 Combustion Air .....................................................14

4.3.1 Combustion Air from Room ........................14

4.3.2 Ducted Combustion Air ..............................14

4.4 Venting (exhaust) .................................................16

4.5 General Location Guidelines ................................17

4.6 Locations for Vent Pipe Terminator ......................19

4.6.1 Direct Venting Clearances ..........................19

4.6.2 Non-Direct Venting Clearances ..................20

4.6.3 Venting Requirements in Massachusetts ...21

4.7 Air Supply and Vent Connections at the Appliance .22

4.7.1 Vent / Air Pipe Lengths ...............................22

4.7.2 Direct Venting .............................................22

4.7.3 Indoor Combustion Air ................................23

4.8 Vent / Air Pipe Termination ...................................23

4.9 Gas Supply and Piping .........................................25

4.10 Gas Supply Pressure ..........................................28

4.11 Gas Set Up and Adjustment ................................28

4.12 High Altitude Installations and Orifices ................29

4.13 Natural Gas to Propane Conversion ...................30

4.14 Plumbing Guideline .............................................34

4.15 Pressure Relief Valve ..........................................38

4.16 Disposal of Condensate ......................................39

SECTION 5

Control Display and Operation

5.1 Control Dial and Buttons .......................................48

5.2 LCD Overview .......................................................49

5.3 Operating Mode ..................................................50

5.4 Status Display Mode ...........................................51

5.5 DHW Set Point Change Mode ............................52

5.6 CH Set Point Change Mode ................................53

5.7 Storage Mode ......................................................53

5.8 Installer Mode ......................................................54

5.9 Outside Temperature (option) ..............................56

5.10 External Set Point Temperature Control ..............56

5.11 Error Mode ..........................................................57

SECTION 6

Error Codes

6.1 Error Codes ......................................................... 58

6.2 Fault Tree Analysis .............................................. 61

SECTION 7

Trouble Shooting

7.1 Diagnostics .......................................................... 63

7.2 Suggested Corrective Actions ............................. 65

SECTION 8

Maintenance

8.1 Annual Startup and General Maintenance .......... 66

8.2 Flushing the Boiler .............................................. 68

8.3 Draining and Cleaning ......................................... 69

SECTION 9

Installation Check

9.1 Quick View .......................................................... 70

9.2 Final Check Lists ................................................. 70

SECTION 10

Repair Part Diagram

10.1 Parts List and Illustrations ................................... 71

10.2 Notes: ................................................................... 72

Mascot FT Combination Boiler

SECTION 1

Product Accessories

1.1 Introduction

This manual provides information necessary for the installation, operation, and maintenance of the LAARS

Heating Systems Mascot FT. All application and installation procedures must be read and reviewed completely before proceeding with the installation. Consult the LAARS Heating

Systems factory, or your local factory representative, with any problems or questions regarding this equipment. Experience has shown that most operating problems are caused by improper installation.

All installations must be made in accordance with

1) American National Standard Z223.1/NFPA54-Latest

Edition “National Fuel Gas Code” or

1.2 Included with the Appliance

Item Description Qty

Page 1

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,

Combination Boiler

MFTCW140

1

Installation Instructions and

Users Manual

Installation and Operation Instructions Document 1318

Installation and Operation

Instructions for

MASCOT

®

FT

Wall-Mounted, Modulating

Gas, Condensing, Combination Boiler

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualifi ed in hot water boiler and heater installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in fl ue gases which could cause serious injury, property damage, or death. Improper installation and/or operation will void the warranty.

WARNING

If the information in this manual is not followed exactly, a fi re or explosion may result causing property damage, personal injury or loss of life.

Do not store or use gasoline or other 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 fi re department.

Installation and service must be performed by a qualifi ed installer, service agency, or gas supplier.

AVERTISSEMENT

Assurez-vous de bien suivres les instructions données dans cette notice pour réduire au minimum le risque d’incendie ou d’explosion d’autres vapeurs ou liquides infl ammables 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.

des téléphones dans le bâtiment où vous vous trovez.

gaz depuis un voisin. Suivez les instructions du fournisseur.

gaz, appelez le sservice des incendies.

L’installation et l’entretien doivent être assurés par un installateur ou un service d’entretien qualifi é ou par le fournisseur de gaz.

1

Condensate Hose

Wall Mount Bracket

1

1

2 types of Wall Anchors

4

Pressure Relief Valve

(CH LINE 3/4˝ 30psi)

Model: CASH ACME F-82

3” Mesh Screens

4.5 GPM Flow Restrictor

Dark Blue

*

*

A 3.2 GPM Flow Restrictor (white) has been factory installed. See Section 4.18

4

1

2

1

Page 2

1.2 Included with the Appliance (continued)

Items

Propane Conversion Orifice

Descriptions


Qty

1

O-Ring and Gasket Kit

1

Outdoor Sensor with screws and anchors

1

1/2” x 3/4” Bell Coupling for Gas Line

1

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 identifies the characteristics of your Mascot FT.

1

M

2 3 4

F T C

SERIES

Mascot FT

C - Combi

5 6 7 8

W 1 4 0

CONFIG

W - Wall Hung

SIZE

MBTU/h

1 4 0

9

FUEL

N - Natural

P - Propane

10

A

ALTITUDE

A - 0 -10,000 Feet

11

1

REVISION

1 - First

12

X

OPTIONS

X - Standard

13

N

PUMP

N - with Pump

Figure 1. Model Nomenclature


M ascot FT Gas Conversion Kit

2.2 Specifications

Page 3

Document 4288

MFTCW140

Gas Input Rate

Hot Water Capacity

MIN

Display back ON to continue with CO2 measurements.

Installation

45°F Rise

CO

2

value

MAX FIRE

MIN FIRE

Gas Supply Pressure

Vent Run

Table C

Manifold Pressure

NG

LP

Gas type

Manifold pressure

High fire

MFTCW140

MAX FIRE

Natural Gas (NG)

2˝ VENT

0.002” W.C 0.1” W.C

3˝ VENT

Indoor / Wall hung type

8 - 10%

9.5 - 11%

9 - 10.5 %

2˝(50ft) , 3˝(100ft) Schedule 40 CPVC, PP, PVC

-0.85±0.2"

-0.15” W.C

28,000 Btu/h

-0.5±0.2"

-0.216” W.C

CO should not exceed 200 ppm.

5.5 GPM

3.2 GPM

Propane Gas (LP)

2˝ VENT

3.5˝ WC to 10.5˝ WC

8.0˝ WC to 13˝ WC

-0.75±0.25"

-0.15” W.C

-0.4±0.25"

-0.216” W.C

0.079” W.C

Power Supply

Table D

Main Supply 120V 60Hz / 4A

19.

Maximum Power

Once the CO2 and manifold pressure measurements for both MIN and MAX Fire are correct, turn OFF the Control Display and set DIP switches 6 and 7 to the OFF position for

Single Orifice Premixed Fuel Modulation

Turn the Control Display back on when done.

20.

Write in the correct Conversion Date and the Technicians Name to the included gas

Dimensions

0.5 GPM conversion sticker. See Figure F. Then apply that sticker adjacent to the rating plate.

21.

Put the boiler cover back on and assemble/tighten the 4 screws that hold the cover in place.

Sub Heat Exchanger Water Capacity(DHW) Under 1 Gallon

NGTX-900CP / P-920C

Connection Sizes

Water Pressure

Cold Water Inlet / Hot Water

Outlet

Min 15 ~ Max 150 PSI en utilisant le kit numéro _____ par______________

Figure F (Conversion label)

1˝ NPT

1/2˝ NPT

Materials

Heat Exchanger

Cold Rolled Carbon Steel

Primary Heat Exchanger : Stainless Steel

Sub Heat Exchanger : Stainless Steel

Safety Devices

Flame Rod, Overheat Cut Off Device, Gas Valve Operation

Detector, Exhaust Temperature High Limit Switch, Water

Customer Service and Product Support:

20

Temperature High Limit Switch

www.Laars.com

pg 4 of 4

www.Laars.com

Page 4

2.3 Dimensions

Air Intake

Vent


G

H

E

F

C

D

A

B

Description

Air Intake collar

Vent Pipe Collar

‘CH’ Supply Adapter

‘CH’ Return Adapter

‘DHW’ Outlet Adapter

‘DHW’ Inlet Adapter

Gas Inlet Adapter

Condensate Line

Diameter

3"

3"

1" NPT

1” NPT

3/4” NPT

3/4” NPT

1/2” NPT

1/2" NPT


2.4 Names of Components

30

# Name of Component

1

Air Vent (air eliminator)

2


3

Air Intake Collar

4

Air Gas Mixing Pipe

5

Gas Valve

6

DHW Water Tank

7

Main PCB

8

Manual Power Switch (ON / OFF)

9

Recirculation Pump DHW / CH Primary Pump

10

'CH' Supply Connection

11

'CH' Return Connection

12

CH Pressure Gauge

13

DHW Outlet Connection

14

Gas Inlet Connection

15 DHW Inlet Connection (filter and flow restrictor)

Hydronic Supply Hydronic Return

# Name of Component

16

Condensate Connection

17

Condensate Trap

18

Air Pressure Switch (condensate)

19

Mixing Valve

20

Terminal Block

21

Control Panel and Display

22

Heat Exchanger

23

Ignition Trans

24

Flame Detecting Sensor

25

Burner Case

26

BLDC Fan

27

Vent Pipe

28

Air Pressure Switch

29 Vent Pipe Collar

30 Sight Glass

Page 5

Page 6

2.5 Product Flow Paths and Characteristics

2.5.1 Central Heating flow. Combination Boiler Heating Mode.

Water in the heating pipe is used for space heating.

Combustion

Air

Vent


Hydronic Supply Hydronic Return


2.5 Product Flow Paths and Characteristics

2.5.2 Domestic Hot Water flow. Combination Boiler Domestic Hot Water Mode.

Cold water passes through the exchanger and is heated via a mini indirect tank.

The domestic hot water (DHW) is provided on demand.

Combustion

Air

Vent

Page 7

Integral Mini

Indirect Tank

(DHW)

Water Outlet Water Inlet

Page 8

SECTION 3

.


3.1 Safety Symbols

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 definitions for these terms are as follow:

DANGER

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. This signal word is limited to the most extreme situations.

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It is also used to alert against unsafe practices and hazards involving only property damage.


WARNING

FOR YOUR SAFETY READ BEFORE

OPERATING

If you do not follow these instructions exactly, a fire 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 floor because some gas is heavier than air and will settle on the floor.

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 fire 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 qualified service technician. Force or attempted repair may result in a fire or explosion.

D. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

This appliance must be installed in accordance with local codes if any; if not, follow ANSI Z224.1/NFPA

54 or CAN/CSA B149.1, Natural Gas and Propane

Installation Code, as applicable.

This appliance is certified 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 9

DANGER

Vapors from flammable liquids will explode and catch on fire. These will cause death or severe burns.

Do not use or store flammable products such as gasoline, solvents or adhesives in the same room or area near the appliance.

Keep flammable 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 floor

Can spread from other rooms to the main burner by air currents

Do not install the appliance where flammable products will be stored.

Read and follow boiler warnings and instructions thoroughly. If owner’s manual is missing, contact the retailer or manufacturer.

This combination boiler must be installed by a qualified plumber, a licensed gas fitter, 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.

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 fire, overheating, flood, physical damage, or any other damaging condition that might affect the operation of the unit. Boiler must be checked by a qualified technician before resuming operation.

DO NOT use this Boiler if any part has been under water. Immediately call a qualified 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 qualified technician if the Boiler needs repair or maintenance.

Ask your gas supplier for a list of qualified service

providers.

DO NOT use spray paint, hair spray, or any other flammable 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 flow in or out of the vent system.

“Caution: While repairing control, all wires are labeled. You must connect the wires in accordance with the instruction.

Wiring errors can cause improper and dangerous

operation.

“Verify proper operation after servicing operation”

This consists of the gas ignition system components which are protected from water (dripping, spraying, rain, etc.) during operation and service (circulator replacement, condensate trap, control replacement, etc.).

After installing the heater, safety devices must be tested.

This boiler is equipped with a blocked vent shutoff system.

If the error code ‘41’ occurs, follow the instructions

below.

- First, turn off the manual gas valve.

- Make sure that there is no foreign object in the vent passage or rodent screen.

- If you do not find any problem, do the following.

- Turn off the error state by pressing the power button of control panel.

- If the error occurs repeatedly, call your service technician or gas supplier.

Page 10

SECTION 3

.


3.2 Safety Precautions and Proper Use


Before Operation

1. Check the Gas Type (NG/LP)

When using or moving the unit for the first 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 insufficient water or no water is in the heating pipes.

(valve: always open position)

open

4. Check the Gas Valve

Check that the manual gas shut-off valve that supplies the Mascot FT is opened.

5. Check the area around the appliance and remove any combustible or flammable materials. Remove laundry or any other items that are on or near the boiler or vent pipe.

When in Operation

CAUTION

1. Caution for Gas leak

Frequently check for a gas leak at the gas connection portion with soapy water.

Steps to take if you have a Gas leak.

1. Shut down the boiler as soon as gas fumes are detected.

2. Close the intermediate gas valve.

3. Open windows for ventilation.

4. Call a qualified service technician for immediate repair.

2. Caution for Ventilation

Make sure that there is sufficient inflow and outflow 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 flue or pipes. They become extremely hot during operation.


Page 11

WARNING

Do not use the appliance for any other purpose than for heating and hot water.

Do not store combustibles or flammable material such as gasoline near the appliance.

Do not store other items on or near this boiler.

Do not store combustible (flammable) materials such as papers.

Do not hang clothes on the vent pipe. This may start a fire.

Burn Protection

Be cautious when opening the hot water tap. The water is very hot. Especially, children or the elderly whose skin is liable to burn must not use the hot water without help of a guardian.

After repair of gas pipeline or gas regulator replacement, call A qualified contractor for inspection before starting it up.

Carbon monoxide poisoning

If vent pipe fumes enter the room, it could cause poisoning by carbon monoxide gas. Check that the vent pipes are properly connected. Open windows for ventilation. Call a qualified service technician for immediate repair.

Gas leakage test.

Gas supply line must be inspected regularly.

Do not shut off the Boiler.

When you leave home for a long time, do not shut off Boiler. The Boiler has a freeze protection function. The ceramic heater is installed inside of the heater’s internal pipe to protect the heater from freezing.

Do not wipe the appliance or control panel with wet cloth.

Electric shock may occur, or internal parts may fail due to the exposure to moisture.

Do not disassemble the Boiler.

If repair is required, call your local qualified technician.

Page 12

SECTION 4.

Installation

4.1 Location and Clearances

The Mascot FT must be mounted to a suitable wall by a qualified 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.

3

8

9

23

12

30

3

8

6

15


WARNING

Installations must comply with

• All the local, state, provincial, and national codes, laws, regulations and ordinances.

• National Fuel Gas Code, ANSI Z223.1 – The latest version.

• National Electrical Code.

• A National Standard of Canada CAN/CSA-B149.1

Check before placing the Combination boiler

• Always check the connected components which are near to the heater. The components are below.

Water piping position / Venting adapter / Gas supply piping / Electrical power / Condensate drain hose.

• Inspect area around Combination boiler. Remove any combustible materials, gasoline and other flammable liquids. Failure to keep Combination boiler area clear and free of combustible materials, gasoline and other flammable liquids and vapors can result in severe personal injury, death or substantial property damage.

• The Combination boiler which has gas control system components must be protected from any possible danger during operation and service.

• If new Combination boiler replaces an existing appliance, check and correct system problems, for example:

- Do not install if: System leaks causing oxygen corrosion or heat exchanger cracks from hard water deposits.

Provide clearances

• If the heater was installed in a narrow space or corner, please ensure that there is sufficient 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.

Figure 2. Locating the Appliance.

Minimum clearances to Combustibles.

For installation from

Non-Combustibles and

Combustibles

TOP of appliance

BACK of appliance

9 in

(23 cm)

5/8

in

(1.5 cm)

FRONT of appliance

SIDE of appliance

6 in

(15 cm)

3 in

(7 cm)

BOTTOM of appliance

12 in

(30 cm)

Table 1. Minimum Clearances to Combustibles and for Service.

Suggested

Service

Clearance

18 in

(46 cm)

5/8

in

(1.5 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.


4.2 Wall Mount Bracket

• 4.2.1 The installation height and location for your

Mascot FT depends on your installation scenario. With all clearances considered, and given adequate positioning for air supply and venting, you will need to determine the best position to mount the Wall Mount Bracket. The wall must be concrete, wood, or plywood over studs, and must be strong enough to hold the boiler!

• Start by familiarizing yourself to how the included Wall Mount Bracket hooks underneath the two Hangers that are attached to the back of the boiler. The ‘hooks’ of the Wall Mount Bracket will be 3” from the Top of the boiler once the boiler is hung.

Bolts (4)

• 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.

Anchors

(4)

Wall Mount

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.

Hangers (2)

(fastened to the back of unit)

Page 13

3" to Top

of Unit

Concrete,

Wood, or 5/8" Plywood

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 (field supplied).

Page 14


SECTION 4.

Installation

(continued)

4.3 Combustion Air

Mascot FT boilers must have provisions for combustion and ventilation air in accordance with the applicable requirements for Combustion Air Supply and Ventilation in the National Fuel Gas Code, ANSI Z223 1; or in

Canada, the Natural Gas and Propane Installation Code,

CSA B149.1. All applicable provisions of local building codes must also be adhered to.

A Mascot FT unit can take combustion air from the space in which it is installed, or the combustion air can be ducted directly to the unit. Ventilation air must be provided in either case.

4.3.1 Combustion Air from Room

In the United States, the most common requirements specify that the space shall communicate with the outdoors in accordance with method 1 or 2, which follow.

Where ducts are used, they shall be of the same 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 confined 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 field-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

ABS

PVC, sch 40

CPVC, sch 40

Polypropylene

Single wall galv. steel

UNITED STATES

ANSI/ASTM D1527

ANSI/ASTM D1785 or D2665

ANSI/ASTM F441

UL1738, ULC S636.

26 gauge

CANADA

Air pipe material must be chosen

CPVC, sch 40, ANSI/ASTM, Polypropylene based upon the intended application of the boiler.

Table 2. Required Combustion Air Pipe Material.


Page 15

NOTICE

The instructions for the installation of the venting system shall specify that the horizontal portions of the venting system shall be supported to prevent sagging; the methods of and intervals for support shall be specified. 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.

CAUTION

The Mascot FT is standard as a Natural Gas Boiler and must be converted if propane is the desired gas, unless specifically 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 flow.

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 backflow preventer in the cold water supply line will prevent thermal expansion backflow. 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.

AVIS

Les instructions d'installation du système d'évacuation doivent préciser que les sections horizontales doivent être supportées pour prévenir le fléchissement. Les méthodes et les intervalles de support doivent être spécifiés. 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.

Page 16


4.4 Venting (Exhaust)

NOTICE

DO NOT COMMON VENT MASCOT FT UNITS.

Mascot FT units are never permitted to share a vent with Category I appliances.

The flue temperature of the Mascot FT changes dramatically with changes in operating water temperature. Therefore, it is necessary to assess the application of the boiler to determine the required certified vent class. If the Mascot FT is installed in an application where the ambient temperature is elevated, and/or installed in a closet/alcove,

CPVC, polypropylene, or stainless steel material is required. If the system temperatures are unknown at the time of installation, stainless, polypropylene or

CPVC material is recommended.

The Mascot FT is a Category IV appliance and may be installed with PVC, CPVC or polypropylene that complies with ULC-S636, ANSI/ASTM D1785 F441

(see Table 3) or a stainless steel venting system that complies with UL 1738 Standard and ULC S636.

WARNING

Use of cellular core PVC (ASTM F891), cellular core

CPVC, or Radel® (polyphenolsulfone) in venting systems shall be prohibited.

WARNING

Failure to use the appropriate vent material, installation techniques, glues/sealants could lead to vent failure causing property damage, personal injury or death.

WARNING

All venting must be installed according to this manual and any other applicable local codes, including but not limited to, ANSI Z224.1/NFPA 54, CAN/CSA B149.1 and ULC-S636. Failure to follow this manual and applicable codes may lead to property damage, severe injury, or death.

AVIS

NE PAS ÉVENT COMMUNE MASCOTTE FT UNITÉS.

Mascotte FT unités ne sont jamais autorisés à partager un évent Catégorie I avec les appareils.

INSTALLATIONS IN CANADA require the use of venting material certified to ULCS636. All Gas vents connected to the Mascot FT, plastic, stainless steel or otherwise must be certified to this ULC standard. Appropriate selection of vent material is very important for proper performance and safe operation of the Mascot FT.

The flue temperature of the Mascot FT changes dramatically with changes in operating water temperature. Therefore, it is necessary to assess the application of the boiler to determine the required certified vent class. If the Mascot FT is installed in an application where the outlet water temperature exceeds 145°F, and/or installed in a closet, class IIB or higher vent material is required.

If the system temperatures are unknown at the time of installation, class IIB or higher venting material is recommended.

IN CANADA all venting used must meet the following requirements:

1. ULC-S636 certified and marked

2. The first 3 feet of venting must be accessible for visual inspection.

3. All components used in the vent system must be from a certified manufacturer.

4 . Vent system components must not be mixed with alternate manufacturers certified components and/or unlisted components.

5 . The venting must be installed according to the vent manufacturers installation instructions.

The unit’s vent can terminate through the roof, or

MATERIAL

Stainless Steel

PVC, sch 40

CPVC, sch 40

Polypropylene

VENTING INSTALLATION STANDARDS

UNITED STATES

UL 1738

ANSI/ASTM D1785

CANADA

Venting must be ULC-S636 certified for use as venting material. The venting material must be chosen

ANSI/ASTM F441

UL1738 or ULC-S636 based upon the intended application of the boiler.

Table 3. Required Exhaust Vent Material.


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.

Page 17

WARNING

Failure to vent this Boiler in accordance with these instructions could cause a fire, resulting in severe property damage, personal injury or death.

Do not interchange vent systems or materials unless it is specified.

The use of thermal insulation covering pipe and fittings 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.).

4.5 General Location Guideline

1. Vent system installation must be in accordance with Local codes or, in the absence of local codes, the National Fuel Gas Code, ANSI Z224.1 /NFPA

54 and/or CSA B149.1, Natural Gas and Propane

Installation Code.

2. The Boiler is designed to be installed as a Direct

Vent (sealed combustion) type. The air for combustion must be supplied directly from the outside to the burner. Also, the flue 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 specifically 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 18

4.6 Locations for Vent Pipe Terminator


* For clearances not specified in ANSI Z224.1 / NFPA 54 or CAN/CSA-B 149.1, please use clearances in accordance with local installation codes and the requirement of the gas supplier.

4.6.1 Direct Venting Clearances

C

D

G

H

I

A

B

E

F

J

K

Description

Clearance above grade, veranda, porch, deck, or balcony

Clearance to window or door that may be opening

Clearance to permanently closed window

Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet from the center line of the terminal

Clearance to unventilated soffit

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

Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance

US Direct Vent Installations

12 in (30 cm)

12 in (30 cm)

*

Canadian Direct Vent

Installations

12 in (30 cm)

36 in (91 cm)

*

*

*

*

*

*

* *

*

*

*

3 ft (91 cm) within a height 15 ft (457 cm) above the meter/ regulator assembly

3 ft (91 cm)

36 in (91 cm)

Clearance to a mechanical air supply inlet

12 in (30 cm)

3 ft (91 cm) above if within 10 ft (3 m) horizontally

*

6 ft (1.83 m)

7 ft (2.13 m)

L

M

Clearance above paved sidewalk or paved driveway located on public property

Clearance under veranda, porch, deck, or balcony

Table 4. Direct Vent Clearances

* 12 in (30 cm)


Page 19

4.6.2 Non-Direct Venting (Single Pipe) Clearances

Description

A

Clearance above grade, veranda, porch, deck, or balcony

B

C

Clearance to permanently closed window

D

Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet from the center line of the terminal

E

Clearance to unventilated soffit

F

Clearance to outside corner

G

Clearance to inside corner

H

Clearance to each side of center line extended above meter/ regulator assembly

J

I

Clearance to service regulator vent outlet

Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance

K

Clearance to window or door that may be opening

Clearance to a mechanical air supply inlet

L

Clearance above paved sidewalk or paved driveway located on public property

M

Clearance under veranda, porch, deck, or balcony

Table 5. Non-Direct Vent Clearances

*

US Non-Direct Canadian Non-Direct

12 in (30 cm) 12 in (30 cm)

*

48 in (120 cm) below or to side of opening;

12 in (30 cm) above opening

*

36 in (91 cm)

*

*

*

*

*

*

*

*

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

*

*

*

36 in (91 cm) within a height 15 ft (4.57 m) above the meter/ regulator assembly

36 in (91 cm)

36 in (91 cm)

6 ft (1.83 m)

7 ft (2.13 m)

12 in (30 cm)

Page 20


4.6.3 Venting Requirements in the

Commonwealth of Massachusetts

In Massachusetts the following items are required if the side-wall exhaust vent termination is less than seven (7) feet above finished 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 gasfitter shall observe that a hard-wired carbon monoxide detector with an alarm battery back-up is installed on the floor level where the gas appliance is to be installed. In addition, the installing plumber or gasfitter 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 qualified 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 floor 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 certified.

3. Signage. A metal or plastic identification 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 21

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.

NOTICE

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 deficiencies 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 overflows to the discharge opening. Use the flame 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 modified 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

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 flamme 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. Tout 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 modifiée, le système devrait

être modifié 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 22


4.7 Air Supply and Vent Connections at the Appliance

4.7.1 Vent / Air Pipe Lengths

Boiler model

MFTCW140

3˝ Combustion Air / Vent Pipe

Max Elbow Max

100´ (30M) 6

2˝ Combustion Air / Vent Pipe

Max Elbow Max

50´ (15M) 4

Table 6. Maximum Vent / Air Pipe Lengths for either 3” or 2 “ Pipes

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



• The thickness of the wall vents installed : Min 4˝ ~ Max 20˝

NOTE: When using a 2” vent pipe, DIP Switch 4 must be in the OFF position. Be sure to power

Off the Mascot FT before changing DIP switches.

For 3” Pipe vent, the default setting for DIP 4 is ON.

Refer to Section 4.19

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) field-supplied plastic vent piping must comply with CAN/CSA B149.1

(latest edition) and be certified 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 fittings. All plastic components and specified primers and glues of the certified 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 fitting.

- For 2” installations, install a field supplied 3” to

2” adaptor. Adaptor must be installed in vertical section of piping only.

3” pipe

2” pipe connected, using an adapter

3” to 2” adapter is NOT included.


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 specified by ANSI Z224.1/NFPA 54.

In Canada refer to CAN/CSA B-149.1

Model

Maximum Input (BTU/H)

Indoor make up air is provided, a minimum free area of 1 in2 per

1,000 BTU/H

MFTCW140

140,000

140 in2 13 1/4"

(W) x 13 1/4" (H)

NOTE: The Mascot FT needs fresh air for safe operation and must be installed so there are provisions for adequate combustion and ventilation air.

4.8 Vent / Air Pipe Termination

Note : For using pipe more than 1 elbow, 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


90-degree elbow


45-degree elbow

• The thickness of the wall vents installed : Min

4˝ ~ Max 20˝

Page 23

Vent Termination

1. Rodent Screen Installation

• Install Rodent Screen and Vent Terminal

(additional purchase), see Figure for appropriate configuration.

• 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)

Horizontal Vent Termination

• Direct Vent - Sidewall Terminations

Page 24

4.8 Vent Pipe Termination (cont)

Horizontal Vent Termination

(cont)

• Direct Vent - Optional Sidewall

Snorkel Terminations


Vertical Vent Termination

• Direct Vent - Vertical Terminations with Sloped Roof

Concentric Vent Termination

• Direct Vent - Optional Horizontal and Vertical Concentric Vent

Side wall Vent

(2"or 3")

Side wall Vent

(2"or 3")

Roof Vent

(2"or 3")


Page 25

4.9 Gas Supply and Piping

Gas piping should be supported by suitable hangers or floor stands, not the appliance.

Review the following instructions before proceeding with the installation.

1. Verify that the appliance is fitted 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 7 and Table 9 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 liquefied 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 flame 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 firing 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.

SCHED 40 METAL PIPE CAPACITY FOR 1.50 SPECIFIC GRAVITY

UNDILUTED PROPANE

NOMINAL PIPE SIZE

@

11" W.C. INLET AND 0.5" W.C. PRESSURE DROP

SIZE

1/2" 3/4" 1"

LENGTH MAXIMUM CAPACITY IN THOUSANDS OF BTU PER

HOUR

20

40

60

80

200 418 787

137 287 541

-

-

231 434

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.

Table 7. Nominal Pipe Size, Propane

SCH 40 METAL PIPE CAPACITY FOR 0.60 SPECIFIC GRAVITY NATURAL GAS

NOMINAL PIPE SIZE

@

0.30" W.C. PRESSURE DROP

LENGTH

3/4" 1"

FT CUBIC FEET OF GAS PER HOUR

20

40

60

80

190 350

130 245

105 195

90 170

100

Table 8. Nominal Pipe Size, Natural Gas

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

NOMINAL PIPE SIZE

FITTING

1/2" 3/4" 1"

LINEAR FEET

90° ELBOW

3.6 4.4 5.2

TEE

4.2 5.3 6.6

Table 9. Equivalent Pipe Lengths

Page 26

SECTION 4. Installation


4.9 Gas Supply and Piping

The gas connection fitting on the unit is 1/2˝ female NPT.

The supply line must be sized for the maximum output of the combination 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 Combination 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 recommended that an approved gas union fitting be installed in the supply line between the shut-off valve and the 1/2˝ female NPT connection on the

Combination boiler.

1) Install an approved gas line pipe to gas line connection under the Combination 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 combination 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 combination boiler until all connections have been completed, checked for leaks, and the heat exchanger is filled with water.

CLOSE POSTION

UNION FITTING

MANUAL SHUT OFF VALVE

Gas Line Valve Detail

GAS PIPE



Suggested Natural Gas (NG) Layout

Page 27

4.9 Gas Supply and Piping

Suggested Propane Gas (LP) Layout

Combination boiler must be installed downstream of the gas meter for adequate gas supply.

Combination boiler gas connection pipe not less than a 1/2”.

Page 28


4.10 Gas Supply Pressure

Refer to the illustration

*

.

Offset Adjustment.

Do Not Adjust without using a combustion analyzer to verify adjustment. Adjust ONLY when in MIN

Fire and when using a combustion analyzer.

See Section 4.13 for step by step details.

Gas Outlet Pressure Port

*

Inlet Gas Pressure port

*


CAUTION

The appliance and its individual shutoff 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 shutoff 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.

4.11 Gas Setup and Adjustment


WARNING

Installer is required to verify combustion settings as part of the installation process. CO should not exceed 200 ppm.

Standard Factory Setting is for MAX Fire. 9.0%

CO2 @ 0-2,000 ft altitude (Natural Gas).

CO

2

2

value

MIN FIRE

MIN FIRE

Table 10. CO2 Values

8 - 10%

8 - 10%

9 - 10.5 %

9 - 10.5 %

Manifold pressure

Manifold pressure

MAX FIRE

MAX FIRE

MIN FIRE

MIN FIRE



2˝ VENT 3˝ VENT

2˝ VENT

-0.15” W.C

-0.15” W.C

0” W.C

0” W.C

3˝ VENT

-0.216” W.C

-0.216” W.C

0.002” W.C

0.002” W.C



2˝ VENT 3˝ VENT

2˝ VENT

-0.15” W.C

-0.15” W.C

0.1” W.C

0.1” W.C

3˝ VENT

-0.216” W.C

-0.216” W.C

0.079” W.C

0.079” W.C

Table 11. Manifold Pressures

19.

Once the CO2 and manifold pressure measurements for both MIN and MAX Fire are correct,

19.

Once the CO2 and manifold pressure measurements for both MIN and MAX Fire are correct,

Nominal Fire (normal operation).

and set DIP switches 6 and 7 to the OFF position for



20.

Write in the correct Conversion Date and the Technicians Name to the included gas

Write in the correct Conversion Date and the Technicians Name to the included gas conversion sticker. See Figure F. Then apply that sticker adjacent to the rating plate.

21.


21.


This unit was converted on ____/____/___to _____gas with kit #____________by______________________

(name and company __________________________ accountable)_________________________________ accountable)_________________________________

___________________________________________

___________________________________________

Cette unité a été converti ____/____/____ten ______gaz

(nom et société_________________________________ en utilisant le kit numéro _____ par______________ responsable)___________________________________ responsable)___________________________________

_____________________________________________




800.900.9276 • Fax 800.559.1583

20

Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355

Headquarters:

20


www.Laars.com

• 905.238.0100 • Fax 905.366.0130

www.Laars.com

pg 4 of 4

www.Laars.com



4.12 High Altitude Installations and Orifices

The Mascot FT is shipped with a Natural Gas Nozzle

(Orifice) that is suitable for altitudes up to 3,000 ft. The

Mascot FT may be installed at elevations up to 10,000 ft, and it can be converted to use Propane Gas to operate at elevations up to 10,000 ft, but to achieve this, the Gas Line Nozzle must be changed out to suit the installation altitude and the desired gas.

To order the Gas Line Nozzle to suit your installation altitude and gas, please visit laars.com/support to get the contact info for your nearest Laars Sales

Representative.

Value

0-3000 ft

(0-914 m)

3,000-6,500 ft

(914-1,981 m)

6,500-10,000 ft

(1,981-3,048 m)

Nozzle (NAT)

6.5 mm

(0.256")

Factory Installed

7.1 mm

(0.280")

#S182100096

Nozzle (LP)

4.85 mm

(0.191")

Included in Box.

5.0 mm

(0.197")

#S182100097

5.1 mm

(0.201")

#S182100098

See Section 4.13

for instructions to change out the Gas Line Nozzle in the Mascot FT.

Gas Line Nozzle (Orifice)

Page 29

Page 30


Document 4288

Kit # R20770 H2373800-

The Laars Mascot FT 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:

NOTICE

The Natural Gas to Propane Conversion Kit (# R20770) 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 this Manual.

The Kit is supplied in a bag attached to the combination 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.

ON / OFF

WARNING

This conversion kit shall be installed by a qualifi ed service agency in accordance with the manufacturer’s instructions and all applicable codes and requirements of the authority having jurisdiction. The information in these instructions must be followed to minimize the risk of fi re or explosion or to prevent property damage, personal injury or death.

The qualifi ed service agency is responsible for the proper 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 instructions 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.

CAUTION

This combination boiler has already been set to burn natural gas, but can be converted to burn LP gas. Before placing the combination boiler into operation, verify that the type of gas

To convert from natural gas

Model

MFTCW140

Natural Gas (NG) Orifi ce

0.255˝ (6.5mm)

Table A. Gas Conversion Parts

to propane gas

Steps 1 thru 21

1.

Turn OFF the Mascot FT. The ON / OFF button is located at the bottom left of the Control Display.

2.

Turn

OFF the GAS and WATER supply to the

Mascot FT (valves are located on the plumbing pipes.)

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 left 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 Fitting on the right, and then carefully swing the Gas Inlet Pipe downward just enough so that it is out of the way. See Figure B.

6.

Remove the existing Natural Gas orifi ce. Save the packing for re-use. See Figure C.

7.

Replace the old Orifi ce with the new Orifi ce for LP

(propane) gas. Re-use the packing from previous.

8.

Return the Gas Inlet Pipe to its original position and tighten both of the Brass Fittings.

Propane Gas (LP) Orifi ce

0.191˝ (4.85mm)

Orifices (Gas Line Nozzles)


800.900.9276 • Fax 800.559.1583

20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355

20 Industrial Way, Rochester, NH 03867

• 603.335.6300 • Fax 603.335.3355

(Applications Engineering)

www.Laars.com

• 905.238.0100 • Fax 905.366.0130

www.Laars.com



M

ascot FT Gas Conversion Kit

Figure A

Document 4288

Page 31

Figure B

Orifice (Gas Line Nozzle)

Packing

Figure C

WARNING

AVERTISSEMENT

This conversion shall be installed by a qualifi ed 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


converted appliance is checked as specifi ed in the manufacturer's instruction supplied with the kit.

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 not proper and complete until the operation of the 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.

pg 2 of 4

www.Laars.com

Page 32


Document 4288

ON

MIN Fire

MAX Fire

NG Natural

3” Vent Size

Do Not Touch

Do Not Touch

Normal Operation

OFF

Normal Operation

Normal Operation

LP Propane

2” Vent Size

Normal Operation

Normal Operation

Do Not Touch

DIP Switch Settings

Table B

3

2

1

#

7

6

5

4

WARNING

Always make sure that the Control Display is turned

OFF before changing any DIP switch. Then turn Control


Figure D

9.

Turn ON the GAS and WATER supply to the Mascot FT.

10.

Per Table B, set DIP Switch

5 to OFF

for LP Propane.

11.

Per Table B

, change dip switches 6 and 7 to a minimum fi re state (MIN Fire)

12.

Turn ON the Mascot FT.

13.

Open the manifold pressure port by loosening the screw two turns as shown in Figure E.

14.

Connect a manometer to the manifold pressure port. For dual port manometers, use the positive pressure side.

15.

While operating the water heater, check CO2 measurement and refer to Table C

16.

Adjust the Cap Screw / Offset Adjustment (See Figure E) until you are within range of Table C.

17.

Turn OFF the Mascot FT.

18.

Repeat steps 11 thru 17 at MAX FIRE by changing DIP switches 6 and 7. BUT Do NOT ADJUST MAX FIRE.

If the MAX FIRE is too Low, then go back to MIN FIRE and adjust MIN FIRE to come up. Be sure to shut boiler OFF before moving DIP switches.

If the MAX FIRE is too High, then go back to MIN FIRE and adjust MIN FIRE to come down. Repeat this process between the MIN FIRE settings and MAX FIRE settings ( without adjusting at MAX FIRE) until both MAX and MIN are within allowable CO2 as per Table C.


800.900.9276 • Fax 800.559.1583

20



• 603.335.6300 • Fax 603.335.3355


Figure E

pg 3 of 4


Document 4288

Page 33

WARNING




CO

2

value

MFTCW140

MAX FIRE

MIN FIRE


2˝ VENT 3˝ VENT

8.5 - 10.5%

8 - 10%

Table C

NOTE: Installer is required to verify combustion settings as part of the installation process.

CO should not exceed 200 ppm.


2˝ VENT 3˝ VENT

9.5 - 11%

9 - 10.5 %

Manifold pressure

MFTCW140

MAX FIRE

MIN FIRE


2˝ VENT 3˝ VENT

-0.15” W.C

-0.216” W.C

0” W.C

0.002” W.C


2˝ VENT 3˝ VENT

-0.15” W.C

-0.216” W.C

0.1” W.C

0.079” W.C

Table D

19.

Once the CO2 and manifold pressure measurements for both MIN and MAX Fire are correct, turn OFF the Control Display and set DIP switches 6 and 7 to the OFF position for

Nominal Fire (normal operation).


20.

Write in the correct Conversion Date and the Technicians Name to the included gas conversion sticker. See Figure F. Then apply that sticker adjacent to the rating plate.

21.


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)___________________________________

_____________________________________________



800.900.9276 • Fax 800.559.1583

20



• 603.335.6300 • Fax 603.335.3355


www.Laars.com

pg 4 of 4

www.Laars.com

Page 34


4.14 Plumbing Guidelines

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 Backflow Preventer

- Apply a backflow 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˝

Expansion tank

(Diaphragm-type)

Automatic air vent

Air separator

Circulation pump

Check valve

Drain valve

Gate valve

Backflow preventer


DHW INLET

DHW OUTLET





Closed type Expansion tank

˝

- Apply 1˝ pipe to the expansion tank to allow air within the system for exhausting.

- Pitch any horizontal piping up towards tank 1 inch per 5 feet of piping.

- DO NOT install automatic air vents on closed type expansion tank systems.

Air must remain in the system and return to the tank to provide its air cushion.

- DO NOT use a closed type expansion tank in a system with the Laars Gas Combination Boiler.

(Automatic air vent has been installed on the boiler.)

- If the combination boiler is installed in a closed water supply system, such as one having a backflow preventer in the cold water supply line, it will control thermal expansion.

Page 35

Expansion tank

(Diaphragm-type)

Automatic air vent

Air separator

Circulation pump

Check valve

Drain valve

Gate valve

Backflow preventer


CH SUPPLY

PRIMARY LOOP

(SPACE HEATING)

DHW OUTLET

CH RETURN

Do not exceed 12" apart

SECONDARY LOOP (SPACE HEATING)

DHW INLET

Page 36



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..

Expansion tank

(Diaphragm-type)

Automatic air vent

Air separator

Circulation pump

Check valve

Drain valve

Gate valve

Backflow preventer


CH SUPPLY

PRIMARY LOOP

(SPACE HEATING)

DHW OUTLET


DHW INLET





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.

Page 37

Expansion tank

(Diaphragm-type)

Automatic air vent

Air separator

Circulation pump

Check valve

Drain valve

Gate valve

Backflow preventer


CH SUPPLY

PRIMARY LOOP

(SPACE HEATING)

DHW OUTLET

CH RETURN



ZONE 1

ZONE 2

ZONE 3

FLOOR HEATING

DHW INLET

Page 38


4.15 Pressure Relief Valve

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 sufficient relieving capacity in accordance with the ASME Rating Plate on the boiler.

This hot water 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 field installation.

An approved ASME HV Pressure Relief Valve must be installed on the DHW supply line as close to the unit as possible. Valve 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 floor.

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 combination boiler.

Test the operation of the valve after filling 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 combination 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 combination 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.

3/4” 30psi Relief Valve



4.16 Disposal of Condensate

High efficiency 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. to floor drain

2. to neutralizer (optional kit)

3. to laundry tub

4. to condensate pump (field supplied)

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 first 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.

NOTICE

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.

AVIS

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.

CAUTION

Condensate is mildly acidic (pH=5), and may harm some floor 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

Neutralizer Kit# A2123601

_________________________________________

Condensate

Trap

Condensate drain pipe

(View is as if side panel were removed)

1

2 3

Page 39

4

3

2

1

0

5

4

Page 40


4.17 DHW Flow Restrictors

A flow restrictor, rated at 3.2 GPM and white in color, is pre-installed into the Mascot FT at the DHW inlet adapter. An additional flow restrictor, rated at

4.5 GPM, is blue in color and is packaged with the

Product Accessories. See Section 1.

If 3.2 GPM is not sufficient for your installation, replace the factory installed white flow restrictor with the blue flow restrictor by following these instructions.

WARNING

If the appliance has been filled and operational, then the gas, water and power must be completely shut off, and the unit must be drained before proceeding with this instruction. See Section 8 of this installation book.

Failure to do so could result in substantial property damage, sever personal injury, or death.

To replace the Flow Restrictor.

1. Being sure that the unit of completely Off and drained, locate the DHW inlet adapter on the bottom of the appliance.

2. Pull the two pins to release the DHW inlet filter. See

Illustration. The flow restrictor is attached to the top of the filter assembly.


3. Remove the installed white flow restrictor and replace it with the blue flow restrictor included with the Product Accessories.

4. Reinstall the DHW inlet filter.

5. Re-insert the two pins.

6. Refill and restart your Mascot FT as per the

Installation Instructions.

6

Performance Graph

10

Un res tric ted

4.5 G

PM ( blue r estric tor)

3.2 GP

M (whi te restric tor)

20 30 40

Pressure (PSI)

50 60 70 80



4.18 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.

Page 41

This appliance must be electrically grounded. Ensure the electrical receptacle that the combination 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 Combination 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 Terminal Block

L N

0-10V

INPUT

T T O / S

0 - 10V

External Input

Thermostat

Connection

Outdoor Sensor

Page 42



4.19 DIP Switches


Document 4288

3

3

2

2

1 1

6

6

5

5

#

#

7

7

4

4

DIP Switch Settings

Table B

WARNING




Figure D

System Control Setting

9.

Turn

10.

ON the GAS and WATER supply to the Mascot FT.

Per Table B, set DIP Switch

5 to OFF

12.

Turn ON the Mascot FT.

for LP Propane.

2.4V

Maximum 10s, minimum 1s

11.

Per Table B

, change dip switches 6 and 7 to a minimum fi re state (MIN Fire)

3s

10s

13.

14.

15.

16.

17.

Open the manifold pressure port by loosening the screw two turns as shown in Figure E.

Connect a manometer to the manifold pressure port. For dual port manometers, use the positive pressure side.

Pump2 post circulating time (T1pv)

Adjust the Cap Screw / Offset Adjustment (See Figure E) until you are within range of Table C.

Turn OFF the Mascot FT.

<6s

18.

Repeat steps 11 thru 17 at MAX FIRE by changing DIP switches 6 and 7. BUT Do NOT ADJUST MAX FIRE.

If the MAX FIRE is too Low, then go back to MIN FIRE and adjust MIN FIRE to come up. Be sure to shut boiler OFF before moving DIP switches.

If the MAX FIRE is too High, then go back to MIN FIRE and adjust MIN FIRE to come down. Repeat this process between the MIN FIRE settings and MAX FIRE settings ( without adjusting at MAX FIRE) until both MAX and MIN are within allowable CO2 as per Table C.


800.900.9276 • Fax 800.559.1583

Headquarters:

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Figure E

pg 3 of 4


Notes:

Page 43

Page 44


4.20 Control Board, Electrical Diagram


Control Board

Color Designations (15-3.11 of ANSI Y14.15) Black (BK) Brown (BR) Red (R) Orange (O) Yellow (Y) Green (G) Blue (BL) Purple (P) Gray (GY) White (W)

CN8 MCU_WRITE

SW1 INSTALL CAPACITY

CN1 RS-485

CN5 RPM Meter

1 2 6 7

2 3

R BK

BK R

R W

W BK

8 2

5 4



4.21 Ladder Diagram

Air Pressure Sensor

F/B

level

Page 45

Page 46


4.22 Electrical Connections

Connector

#, Location, Type

CN9

65001WS-12

CN6

LW6A4-03

CN1

SMW250-5D

CN4

LWD1140-06D

CN8

SMW250-04D

CN11

LWD1140-16

PIN

4

5

1

2

3

6

7

8

7

15

8

5

13

6

14

3

11

4

12

1

8

2

10

3

4

1

2

5

6

3

4

1

2

2

3

9-12

1

3

1

16


HD

TH

APS

EL

BL

Label

Description

-

L

CP1

IT

L(HT)

GV

-

N

N

-

GROUND

Power Supply Line

Not Used

Igniter

Pump : CH

Gas Valve

Power Supply Neutral

AC Power COM Line

CP3/3Way 3 Way Valve

RS-485

FAN

MCU ISP

RS485 +

GND

RS485 -

Not Used

GND

VDD

Fan power(start coil)

Fan power(end coil)

Fan speed feedback signal

GND

ISP /Reset port

ISP TOOL0 Data port

VCC

HWL Not Used

LWL Low Water Level Leakage Sensor

Central Heating Demand

Connect to the Display

Control(Thermostat)

Jump

Jump

Burner Limit

HL Condensate Block

HT SELV

HT (120V~)

HT (120V~)

HT (120V~)

HT (120V~)

HT (120V~)

HT (120V~)

-

HT (120V~)

HT (120V~)

HT (120V~)

HT (120V~)

SELV (5V)

SELV (5V)

SELV (5V)

-

SELV (30V)

SELV (14V)

SELV (30V)

SELV (30V)

SELV (14V)

SELV (5V)

SELV (5V)

SELV (5V)

SELV (5V)

SELV (12V~)

SELV (12V~)

SELV (5V)

SELV (14V)

SELV (14V)

SELV (14V)

SELV (14V)

SELV (14V)



4.22 Electrical Connections

Connector

#, Location, Type PIN Label

CN7

LWD1140-14

CN14

SMW250-09D

CN3

SMW250-06D

CN5

SMW250-10D

8

1

2

4

5

6

2

3

9

1

6

13

7

4

11

5

12

9

3

10

1

8

2

3

4

5

6

7

14

1

2

F.S

OP.S

DH.S

I.S

BG.S

ST.S

SP.S

DHM

APS

SENSOR

FLUX1

RPM

Not Used

Description

Flame Detect Sensor

Operating water temperature sensor

DHW temperature sensor

Return temperature sensor

Venting (Exhaust) temperature sensor

Over-Heat temperature sensor

GND

DHM Stepper motor position

VDD

DHM Stepper motor coil X phase

DHM Stepper motor coil Y phase

VDD

DHM Stepper motor coil /X phase

DHM power IWM Stepper motor coil /Y phase

Unuse

VCC

GND

Voltage Input

VCC

Water Flow Sensor

GND

FAN RPM Check

GND

HT SELV

SELV (5V)

SELV (5V)

SELV (5V)

SELV (5V)

SELV (5V)

SELV (5V)

SELV (5V)

SELV (14V)

SELV (14V)

SELV (14V)

SELV (14V)

SELV (14V)

SELV (14V)

SELV (14V)

SELV (14V)

-

SELV (5V)

SELV (5V)

SELV (5V)

SELV (5V)

SELV (5V)

SELV (5V)

SELV (5V)

SELV (5V)

Page 47

Page 48

SECTION 5. Control Display and Operation

The Control Display


5.1 Control Dial and Buttons

Status Light

(constant green when operating normally)

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.

C

D

E

A

B

Buttons

Display Power

PRESS (Tap)

Turns Control Display

ON / OFF

Functionality

PRESS and HOLD (5 seconds)

Modes Tap to return to menu

Hot Water

Central Heat

Scroll / Select

DHW Set-Point LOW Range

95 - 120°F (35 - 49°C)

CH set-point mode

(boiler only)

Turn to scroll, tap to select

(clockwise or counterclockwise)

(If Display Power was On )

Status Display Mode

(If Display Power was Off )

Installer Mode

DHW Set-Point HIGH Range

121 - 140°F (49.5 - 60°C)

Toggle (°C / °F)

• Temperature Specifications

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.



CH

Heat

Anti-Freeze

Mode

Summer Mode

(warm weather shutdown)

Outside

Temp Mode or 0-10V

Domestic Hot Water Mode

Storage

Heating

Lock

Numeric Display

Page 49

5.2 LCD Overview

Communicating

Installer

Modes

Flame

Signal

Pump

CH mode

Anti-freeze mode

Storage Heating mode

Lock mode

Communication

Summer mode

Status and Installer mode

Flame signal

Pump icon

Numeric Display

DHW mode

Outside temp or 0-10 V mode

Central Heat mode icon can be adjusted

Anti-freeze mode icon

Stored Water Being Heated, can be adjusted

Buttons-locked mode icon

Communication icon

Only DHW Mode, can be adjusted (warm weather shutdown)

The Status Mode or the Installer Mode is Active (all parameters)

Flame Signal icon

Water pump operation (CH or DHW) icon

Number and character display, to display all parameters

Combination boiler Set Point, can be adjusted

Operating by outside temperature or 0-10V

The LCD will illuminate when a user action is detected (a button is pressed) and will turn back off after 20 seconds.

* NOTE: The display will not allow changes when the lock mode is activated.

To exit the Lock mode, press the button.

WARNING

Do not use this appliance if any part has been under water. Immediately call a qualified 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 50



5.3 Operating Mode

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 briefly show a sequence of diagnostic codes before entering into the ‘Operating Mode. It will then display the following information.

Indicate

Current Operating Temperature

Temperature sign Celsius or Fahrenheit letter

Display and Controller are communicating

If flame detected

If pump is operating

Outdoor sensor or 0-10V

Example

110°F

°C or °F



5.4 Status Display Mode

Page 51

Digital Display Status Display Parameter

O:ot Outdoor temperature

A: Li or A: GA Flow unit b: It CH Return Water Temperature

C: Fr d: Lc

E: oP

F: dH

Fan rpm

Lock mode

OP temperature

DHW temperature

H: Eh

I : St

J: oH

L: rt

1: PH

2: rh

3: rH

4: It

5: IH

Description

Current Outdoor temperature

Current flow value(Li: L/m, GA: GPM)

Current Return Water Sensor Temperature

Current fan rpm value

Lock mode ON/OFF

Current OP temperature

Current DHW temperature

Exhaust temperature

N/A

Current Exhaust temperature

Not Used (Default is 0)

Overheat temperature

Burner Operation Time

Burner operation time

Current Overheat temperature

Supply power time Supply power time x 100 hour

Burner operation time

Burner operation time x 1 hour

Burner operation time x 1,000 hour

Ignition cycles

Ignition cycles

Ignition cycles x 10 times

Ignition cycles x 10,000 times

1st Icon 2nd Icon

P: Ou

Displays output condition for internal primary pump and three way valve.

- Off

Not Used

Internal CH

Pump

3rd Icon

3 Way Valve

- On

To change any of the above listed Status Parameters,

Press and Hold Button B to get into the Status Display Mode.

Rotate Dial E until you find 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.

Page 52


DHW Set Point Change Modes

The display shows the following information when changing water heating temperature set points.

Changing between Celsius and Fahrenheit

When the button D is pressed (for more than 5 seconds), temperature unit will toggle between °C and °F.


5.5 DHW Set Point Change Mode

Indicate

Current DHW set-point temperature


If display is communicating with the main controller normally, the communication icon will be indicated.

When DHW set-point range is high : from 121°F (49.5°C) to 140°F (60.0°C)

When changing DHW setpoint, the DHW icon will flash

Example

120°F

°C or °F

H . 140°F

S24

* Default DHW set-point is 120°F (49°C)

• DHW 95-120°F (35 - 49°C) LOW range (Default)

-To change LOW range,

press the C Button. The DHW icon and current DHW LOW will flash (a flashing value means it can be changed).

-Turn dial E clockwise to increase and counterclockwise to decrease until desired temperature is reached.

-Press dial E to save setpoint changes.

• DHW 121 - 140°F (49.5 - 60°C) HIGH range

-To change HIGH range,

press and

HOLD

the C button for more than 5 seconds. The DHW icon and current DHW HIGH will flash (a flashing value means it can be changed).

-Turn dial E clockwise to increase and counterclockwise to decrease until desired temperature is reached.

-Press dial E to save setpoint changes and to Exit.

DANGER

Scalding may occur within 5 seconds at a setting of 140°F (60°C). Water temperatures over 125°F can cause severe burns, or death from scalding. Children, disabled, and elderly are at highest risk of being scalded. Read all instructions before setting temperature at appliance. Feel water before bathing or showering.



Changing between Celsius and Fahrenheit

When the button D is pressed (for more than

5 seconds), temperature unit will toggle between

°C and °F.

Page 53

5.6 CH Set Point Change Mode

Indicate




If flame detected

If pump is operating

When changing CH Setpoint, the CH Icon will flash

Example

110°F

°C or °F

Default CH set-point is 120°F (49°C)

CH set-point range is 86 - 180°F (30.0 ~ 82.0°C)

To change CH Setpoint,

current CH Setpoint will flash.

press the button D desired temperature is reached.

Press E dial to save changes and to Exit.

button. The CH Icon and

Turn the E dial clockwise to increase, and counterclockwise to decrease CH setpoint, until

5.7 Storage Mode

Indicate




If flame detected

Storage mode indication

Example

110°F

°C or °F

If Pump is operating

To change Storage Mode Temp,

First turn OFF the power to the Control Display.

Then Press and Hold Button B to get into the Installer Mode.

Rota te Dial E until you find 5:St Tap Dial E to enter Storage Mode. Storage Mode indicates that the boiler is heating the water held in the internal storage tank. 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.

Page 54



5.8 Installer Mode

These changes are to be made only by a qualified technician.

To c hange any of the Installer Parameters,

Start by turning OFF the Power to the Display Control.

Then, with the power OFF, Press and HOLD (more than 5 seconds) the Button B

Installer Mode. to get into the

Rotate Dial E until you find 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


Page 55


Index

1: EH

2: cE

3: In

4: Fu

5: St

6: OH

7: OL

8: FH

9: FL

10: dr

11: dI

Parameter

History entry

Clear Error History

System initialize

Flow unit

Heat storage function

Maximum Outdoor

Temperature

Minimum Outdoor

Temperature

Max fan

Min fan

Delete running time

Delete igniting times

5.8 Installer Mode

Description

History fault code (E0~E9)

Clearing of error History buffer

System initialize to default gallon / liter

Heat storage function On/Off

When used with an outdoor sensor, sets the maximum outdoor design temperature for the system design. Warm weather shut down will disable the appliance if the programmed outdoor temperature is exceeded. Maximum outdoor temperature must be set 9°F above the minimum outdoor temperature.

Range: (Minimum Outdoor Temperature + 9°F) to 110°F Default 68°F (20°C)

Sets the minimum outdoor design temperature for the system. Minimum outdoor temperature must be set 9°F below the maximum outdoor temperature.

Range: -4°F to (Maximum Outdoor Temperature - 9°F)

Adjusts Maximum Fan Speed

Range: -30 - +30

Adjusts Minimum Fan Speed

Range: -30 -+30

Delete running time

Delete igniting times

12: bt

Outside Unit Function

Delay Time (boost time)

When heating in the outside unit function for the first time, there will be a delay.

(0~120 min, Default 0)

13: Ft

14: bo

Delay time for heating burner operation

Setting temperature of burner ON.

Burner does not operate during the delay time when the burner is turned off due to the temperature during heating operation. (0~20 min, Default 1 min)

Heating temperature setting during heating operation –

Operate in burner ON temperature setting Range:

-12.7°C(9°F)~-2.7°C(27°F), Default 2.7°C(27°F)

15: OF

16:cH

17:cL

18:dH

19:cb

20:db

21:PP

22:Po

23:PF

24:SF

25:So

26:dt

27:PE

Setting for Heating

Maximum Temperature

Setting for Heating

Minimum Temperature

Range:[Minimum Temperature -12.7°C(9°F)]~82°C(180°F), Default 82°C(180°F)

Range: 30°C(86°F)~[Maximum Temperature-12.7°C(-9°F)],Default 30°C(86°F)

Setting for Hot Water

Maximum Temperature

49°C(120°F)~60°C(140°F), Default 60°C(140°F)

Heating Combustion Rate 50%~100%, Default 100%

Hot Water Combustion Rate 50%~100%, Default 100%

Pump Post-Purge Time (Heating Pump) 1min ~ 60min, Default 40min

(Heating Pump Repeat ON Time) 1 min ~60 min, Default 5 min

(Heating Pump Repeat Off Time) 0min ~60 min, Default 10 min

Pump on Time

Pump off Time

Heat storage off

Temperature

Heat storage on

Temperature.

Delay time when switching from DHW mode to CH mode

Internal CH Pump Post-

Purge Time,

T/T Satisfied

60°C(140°F)~75°C(167°F),Default(70°C)158°F

(off Temperature-Setting Temperature) -12.7°C(9°F)~2.2°C(36°F),

Default (-2.7°C) 27°F

Range: 0 – 2 minutes,Default 2min

Allows the user to set the appliance pump post purge time once the appliance CH setpoint and thermostat are satisfied. Range: 1-5 minutes,Default 1min

28: HA

High Altitude setting (Normal)0<1<2<4 (High)

29: AP

Internal CH Pump and

3-way valve Pump Test

Mode

Internal CH Pump and

3-way valve Pump Test

Mode

This function sets the time to run both the Internal CH and 3-way valve pumps to purge air from the system. Range: 1 – 30 minutes ,Default 5min

Turn this function on to activate Internal CH and 3-way valve pump testing.

Only works in installation mode. Turns off when in normal mode. Default OFF

The Full List of Installer Mode Parameters

Page 56


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 6:OH “high outdoor temperature setpoint”, the control point setting is adjusted to 17:cL “low boiler temperature setpoint”.

When the outdoor air temperature reaches 7:OL “low outdoor temperature setpoint” the control setpoint is adjusted to 16:cH “high boiler temperature”.

Default outdoor reset setpoint is 100°F (38°C)

The Outdoor Temperature Mode Icon on the display will flash if an Outdoor Sensor or 0-10 Volt is not connected to the appliance.

See Figure 43 to set your Outdoor Reset Curve.

To check the CH Target Temperature while using

Outdoor Temperature Mode,

Press the button while the appliance is operational and the display panel is powered on.

CH Outdoor Reset


5.9 Outdoor Reset Adjustment

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.

5.10 External Set Point Temperature Control

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 firing.

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 16:cH and 17: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 57

5.11 Error Mode

Indicate

Error ‘ Er : ’ will flash

Error Code


Example

Er:11

Er:11

NOTE: When communication between the Control Display and the main controller is lost, the will not be displayed.

Flashing

Page 58

SECTION 6. Error Codes


Error

Code

10

11

16

20

28

32

33

Error Code

Description

Possible Remedies

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

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 flame 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 flame is stable when lit.

6. If the problem persists, replace the main control.



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.


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 flame is stable when lit.




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 flowing 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


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.


This Error Code will go away when CH temperature decreases.


1. Check overheat temperature sensor. Ensure connections are secure.

2. Check overheat sensor resistance. If resistance is zero, replace the sensor.


This Error Code will go away when outlet DHW temperature decreases.


1. Check DHW outlet temperature sensor. Ensure connections are secure.

2. Check sensor resistance. If resistance is zero, replace the sensor.


This Error Code will go away when CH temperature decreases.


1. Check CH temperature sensor. Ensure connections are secure.

2. Check CH sensor resistance. If resistance is zero, replace the sensor.


Recover methods

Hard

Lock

Hard

Lock

Hard

Lock

Hard

Lock

Soft Lock

Soft Lock

Soft Lock



(continued)

Error

Code Error Code Description

35

36

37

38

40

41

42

43

44

45

61

Venting (Exhaust) Sensor

Open or Short

Abnormal Supply Voltage

Abnormal Supply Frequency

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

Jumped Wire Disconnected

Burner Overheat Switch

Open

Air Pressure Sensor (APS)

Fault

Air Pressure Sensor (APS)

Open

Fan Speed Feedback Signal

Abnormal

Possible Remedies

Recover methods

This Error Code will go away when exhaust temperature decreases.


1. Check Venting (exhaust) temperature sensor. Ensure connections are secure.


3. Check vent pipes for blockage.

4. If the problem persists, replace the main control

Supply voltage is too low to operate. This Error Code will go away when supply voltage returns to normal operating range.


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

Supply frequency is too high to operate. This Error Code will go away when supply frequency returns to normal operating range.


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.

Soft Lock

Soft Lock

Soft Lock


Replace the main control.

Hard Lock

IMPORTANT: If you smell gas, STOP! Follow the instructions on page 2, this manual, and call a qualified service technician or the fuel gas utility.



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.




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.




1. Ensure the jumped wire is properly connected.




1. Check burner overheat switch connections. Ensure connections are secure.

2. Check switch resistance. If resistance is zero, replace the switch.


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


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


This Error Code will go away when the condition is remedied.


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.


Hard Lock

Hard Lock

Soft Lock

Hard Lock

Hard Lock

Soft Lock

Soft Lock

Page 59

Page 60


(continued)


Error

Code

66

68

70

72

76

80

81

85

94

Error Code Description

Mixing Valve Initial Value

Error

(Mixing Valve Cannot Return to Initial Position)

Mixing Valve Operation Error

(Mixing Valve Stuck in Initial

Position)

Register, Ram, Rom, I/O

Port, AD Abnormal, Important

EPROM Data or Safe Data

Abnormal

Flame Signal Detected before

Ignition

Poor Communication

Low Water Level Sensor

(Low Water Level Detected

Four (4) Consecutive times)

Low Water Level Circuit

Freeze Protection

(Appliance has detected water temperature below

34°F(1°C)

Exhaust Sensor detects Vent

Temperature is Greater than

190oF (88oC)

Possible Remedies

Recover methods



1. Turn power OFF and ON at the main power switch internal to the appliance.

2. Check wiring connections to mixing valve. Ensure all are secure.

3. Replace mixing valve.





2. Check wiring connections to mixing valve. Ensure all are secure.

3. Replace mixing valve.








1. Check the appliance cover. Ensure it is secure. Flame detection sensor can detect an external light source.





1. Check connections from main control to display panel.

2. If the problem persists, replace the display and/or the main control.



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.




1. Ensure all valves are open to the appliance and there are no leaks.




This Error Code will go away when the freezing condition is remedied.


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.






1. Check if dip switch Max Fire setting is ON. Switches 6 and 7 should be OFF for normal operation.

2. Check exhaust temperature sensor. Ensure connections are secure.


4. Check exhaust vent for blockage.

5. If the problem persists, replace the control.

6. If the problem persists, replace the heat exchanger.

Soft Lock

Soft Lock

Soft Lock

Soft Lock

Soft Lock

Soft Lock

Soft Lock

Soft Lock

Soft Lock


6.2 Fault Tree Analysis

1. Flame detection

Page 61

Page 62

6.2 Fault Tree Analysis

2. Gas Detection


3. ‘Storage’, ‘DHW’, ‘OP’, ‘CH overheat’, ‘Exhaust heat’ Sensor detects

Error code

E32

E33

E35 contents

DHW NTC open or short

OP NTC open or short

Exhaust NTC open or short


SECTION 7. Trouble Shooting

Page 63

7.1 Diagnostics

Question

Burner dose not ignite when the hot water is opened.

Answer

Make sure that the ON/OFF button on the Control Panel has been turned ON.

If the monitor on the Control Panel is blank, make sure the power cord is plugged and 4A fuses on the main controller in the units are good.

Make sure that there is water supplied to the unit. The unit activates once the inlet water flow 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.

Water is not hot enough.

Water is too hot.

Check that the setting temperature on the unit is not too low

Make sure that the filter 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 specifications.

Make sure that the water flow sensor with three wires has been properly connected on the top of heat exchanger.

Make sure that the setting temperature on the unit is not too hot.

Make sure that the filter in the cold water supply line is not clogged with debris.


Make sure that the filter in the cold water supply line is clean.

Hot water temperature fluctuates at the opened tap.


Check the supply gas pressure is sufficient.

The blower is still operating after the combustion stops.

Temperature Rise too Quickly

Abnormal sounds come from unit during operation.

This is normal because the blower keeps operating for 1 minute to vent

(exhaust) the flue 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 first two minutes the burner is on.

Automatically resets after a few minute delay or using manual reset on control panel. 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 qualified service technician for evaluation.

Improper venting termination, make sure that the venting termination complies with specification.

Check the supply gas pressure is sufficient. Insufficient gas pressure will cause unstable burner flame and noise.

Page 64


7.2 Suggested Corrective Actions

This controller is able to record information about the boiler’s condition at the time of the five previous faults or errors. Refer to the Section ‘5.10 Error Mode’ of this manual.

Display

Nothing shown on display control panel and blower running at full speed.

Condition

Control is not receiving power.

Diagnostic

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.

Corrective Action(s)

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.

Nothing is shown in display control panel and no other boiler components are operating.

Control is not receiving 120V power.

Nothing is shown on control panel, but boiler is operating.

Occurs when the communication is lost from the control to the display.

Is there 120 Volts at the service switch?

Troubleshoot and correct the power supply to the manual 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.

Turn ON the manual power switch inside the boiler case.

Correct wiring inside the boiler case using the wiring diagram in this manual.

Inspect the fuse.

Replace if necessary.

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 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.

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.


SECTION 7. Trouble Shooting

Fault

TEMPERATURE

SENSOR

FLAME FAULT

BLOWER FAULT

IGNITION

FAULT

GAS VALVE

FAULT

7.2 Suggested Corrective Actions

(continued)

Condition

Occurs when a temperature sensor has electrically shorted

(SHORT) or has become disconnected

(OPEN).

Occurs when flame is detected when there should be no flame.

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 flame

The Control has detected a problem with it gas valve output circuit.

panel.

Diagnostic

Reset using manual reset screen on control panel. (Power button)

Reset using manual reset screen on control

(Power button)

Reset using manual reset screen on control panel.

(Power button)

Power off and on.

Reset using manual reset screen on control panel.

(Power button)

Corrective Action(s)

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 flame and conduct combustion test.

Check for flame at burner via flame current with burner off. Turn boiler off and watch flame through observation port. If flame continues after shutdown replace gas valve.

Check wire harness for loose connections and pin engagement at blower.

Connections.

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 flue ways often will not be able to diagnose condition.

Check incoming gas pressure with boiler off and at Max fire. Adjust within limits on rating label.

Check for flue pipe and intake pipe restrictions or blockage

Check burner fasteners and gaskets

Check air intake pipe and proper propane orifice

Check wire harness connections between gas valve and Control.

If lockout re-occurs replace Control.

Page 65

Page 66

SECTION 8. Maintenance


8.1 Annual startup & general maintenance

Regular Maintenance

- This Manual should be placed in a safe and dry location near the Combination 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 Combination boiler casing and the two upper and lower screws are tightened well. Combination 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 Combination boiler, call a qualified service technician to inspect the Combination boiler for possible damage from acid corrosion.

WARNING

DO NOT store combustible materials, gasoline or any other flammable vapors or liquids near the Water Heater. Remove them immediately or store them other places.

- 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 Combination boiler.

(Power line through the strain relief in the bottom of the combination boiler casing and fix it.)

- Check the status of the control panel

Check status of the power supply. Please check for any debris on the button.

Maintenance procedures [ Monthly ]

- Check the vent pipe.

Visually inspect the flue gas vent piping for detecting any signs of blockage, leakage or deterioration of the piping. Please contact a qualified service technician immediately if you find 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 qualified service technician if you notice any problems.

- Check the relief valve.

Inspect the Combination 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 qualified service technician for inspecting the Combination boiler and system.

- Check the condensate outlet.

While the Combination boiler is running, check the discharge end of the condensate drain tubing.

Make sure that no flue gas is escaping from the condensate drain tubing.

If flue gas is continuously escaping, it is a serious problem. Call your qualified service technician for inspecting the Combination boiler and condensate line. Also, refill the condensate trap if problem persists regularly.

- Check the vent terminal screen vent (rodent screen).

If you encounter a problem of combustion specifications, visually inspect the terminal screen.

And then replace it with spare parts or clean the screens.


SECTION 8. Maintenance

- 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.

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 fittings. Immediately call a qualified service technician to repair any leaks. Leaks must be fixed by a qualified service technician immediately.

Failure to comply with this instruction could result in severe personal injury, death or substantial property damage.

- Check the pressure relief valve

WARNING

Leaks must be fixed by a qualified 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 qualified heating installer or a service technician.

Before proceeding, verify that relief valve outlet has been piped to a safe place of discharge, avoiding any possibility of scalding from hot water. If water flows 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

Page 67

8.1 Annual startup & general maintenance

seat. If the valve continues to weep, contact your qualified service technician for inspecting the valve and system. If water does not flow from the valve even though you have lifted the lever completely, the valve or discharge line may be blocked. Shut down the Combination boiler immediately. Call your qualified service technician to inspect the combination 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 a qualified service technician.

Page 68


8.2 Flushing the Combination Boiler

Flushing the Heat Exchanger is a complicated procedure that should only be done by an authorized technician or licensed professional. Keep in mind that improper maintenance can void your warranty.

1. Disconnect electric power to the combination 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 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.

V3

V1

V4 V2

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 combination boiler for at least 1 hour at a rate of 4 gallons per minute.)

7. Rinse the cleaning solution from the combination 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 flow through the combination boiler for

5 minutes.

- Close shut off valve (V2).

D1

D2

8. Disconnect all hoses.

9. Remove the cold water inlet filter from the combination boiler and clean out any residues.

10. Reinsert the filter and ensure the filter cap is securely tightened.

11. Connect electrical power to the combination boiler.

D3


Page 69

8.3 Draining and Cleaning

1. Place a bucket under the appliance to collect the residual water inside the combination boiler.

2. Press Power button on the front control panel to turn OFF the electrical power to the combination boiler.

3. Turn off the gas valve.

4. Close water supply valve on the inlet to the appliance. If there is no valve, turn off main water valve.

5. Open the hot water faucets completely.

6. Remove the cold water inlet filter and 'CH' return filter. And then clean it with a toothbrush and clean running water.

7. To refill the combination boiler, follow the steps of “Draining the Combination Boiler ” in reverse.

Page 70

Section 9 – Installation Check

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.(page 34)

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 fill 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 sufficient 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?


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 flames

• The burner flame must be checked periodically for a constant proper blue color.

• If the flame does not appear normal, the burner may need to be cleaned.

• If the burner needs to be cleaned, it must be performed by a qualified service technician.

Page 71

Sight Glass

Blue flame

Page 72

SECTION 6. Parts List and Illustrations

16

15


16

15

18

19

20

23

25

26

28

KMC#

KMC#

H190200003

IOM Ref

IOM Ref

15

Kiturami Fire Tube Drawing Number List


Part Number

Description Common assemblies will use

FT1002

29

31

H160320029

S549100166

59

60

FT1222

FT1304

H130210023

65_4

FT1313 Burner

KMC#

H190200003

H190200002

S115900025

S264100065

S223100028

S122100010

S900140007

H850150050

S325100028

S489100248

H199990175

S317100009

IOM Ref

23

25

26

28

29

31

44

28

29

47

31

A1

55

33

35

57

36

59

39

38

20

23

40

25

26

A1

15

16

35

18

19

15

16

18

19

20


Part Number

Description Common assemblies will use drawing # of size first created

FT1002

FT1010

FT1014

FT1015

FT1016

FT1019

CASING

Exhaust Duct Ass'y

Air Intake Duct Ass’y

Control

Air pressure switch

Ignition transformer

Display Panel

FT1021 Terminal Block

FT1022

FT1024

Condensate Block APS

Display cover window

Page 73


Part Number

FT1027

Pressure gauge

Condensate trap cover

FT1100

FT1002

FT1010

FT1111

FT1014

FT1015

FT1114

FT1016

FT1019

FT1116

FT1021

FT1022

FT1120

FT1024

FT1025

FT1122

FT1027

FT1100

FT1218

FT1109

FT1111

FT1220

FT1112

FT1222

FT1115

Flow Restrictor

S419100040

S311200030

S549100155

S419100039

H160320029

S549100166

H140240002

S311200027

H130120199

S311400021

H130210023

CH Assembly A1

55

56

57

58

59

60

62

63

65

65_1

65_4

FT1218

FT1219

FT1220

FT1221

FT1222

FT1304

FT1306

FT1307

FT1309

FT1310

FT1313

CH return pipe

CH return sensor

3way valve

CH supply pipe

Pump

HEAT EXCHANGER ASSY

Exhaust Pipe

Exhaust sensor BK

Exhaust overheat sensor

Heat Exchanger Ass'y

Overheat sensor

DHW Assembly A2

Burner

Page 74

Heat Exchanger & Tank

68

69

70

65

63

62


60

65-1

65-4

65-6

65-7

65

71

72

74

75

76

77


Part Number

Description Common assemblies will use drawing # of size first created

KMC# IOM Ref

CASING

H190200003 15

FT1002

Exhaust Duct Ass'y

H190200002

S115900025

16

18

FT1010

FT1014


Control

S264100065 19

FT1015 Air pressure switch

S223100028 20

FT1016 Ignition transformer

S122100010 23

FT1019 Display Panel

S900140007 25

FT1021 Terminal Block

S264100062 26

FT1022 Condensate Block APS

H850150050 28

FT1024 Display cover window

S325100028 29

FT1025 Pressure gauge

S489100248

H199990175

31

A1

FT1027

FT1100

Condensate trap cover

CH Hydro block Ass'y

S419100042

33

FT1109 DHW Outlet Pipe

S514100107

S311200029

35

36

FT1111

FT1112

DHW nipple

Outlet sensor

S419100041

38

FT1114 DHW Inlet Pipe

S317100009

39

FT1115 Flow sensor

S193000001

40

FT1116 Mixing valve

S549100150

43

FT1119 Flor restrictor

S549100145

S549100141

44

45

FT1120

FT1121

DHW filter mash

DHW filter Cap


H199990176

A2

FT1200

S419100040

55

FT1218

S311200030

56

FT1219

S549100155

S419100039

H160320029

KMC#

S549100166

57

58

59

IOM Ref

60

FT1220

FT1221

FT1304

DHW connector

DHW hydro Block Ass'y

CH return pipe

CH return sensor

3way valve


FT1222

Part Number


HEAT EXCHANGER ASSY

Page 75

Igniter

S317100009

39

FT1115

S514100105

H199990176

S419100040

H160320029

S323100096

59

90

FT1222

FT1500

S531100247

S114200021

S531100297

S182100094

97

98

99

100

FT1507

FT1508

FT1509

FT1510

Wall Hung Bracket

Bird Screen 2"

Heat Exchanger Long Bolt

LPG Gas Nozzle 4.85mm

Page 76

Blower and Gas Valve

83-1

83

86-1

86-2

84

89

83

89

85

86-3

86-5

86-2

86-4

89

87


89

88

S554100041

65_7

FT1316

Ignitor

Burner gasket

S551100036

S419100042

S514100107

S311200029

S419100041

S317100009

S531100247

S549100150

S531100247

S549100141

S419100040

S311200030

S549100155

S419100039

H160320029

S549100166

H140240002

S311200027

H130120199

S311400021

H130210023

H190200002

S115900025

S122100010

75

76

31

39

40

43

44

45

33

35

36

38

16

18

19

20

23

25

26

28

55

56

57

58

59

60

62

63

65

65_1

65_4

FT1010

FT1014

FT1015

FT1016

FT1019

FT1021

FT1022

FT1024



FAN & GAS VALVE

CASING

FAN & GAS VALVE


Control

Air pressure switch

Ignition transformer

Gas valve BK

Gas pipe (down)

FT1027

FT1109

FT1111

FT1112

FT1114

FT1115

FT1116

FT1119

FT1120

FT1121

Packing

OPTIONAL ITEMS

DHW Outlet Pipe

DHW nipple

Outlet sensor

DHW Inlet Pipe

Flow sensor

Wall Hung Bracket

Flor restrictor

Wall Hung Bracket

DHW filter Cap

FT1218

FT1219

FT1220

FT1221

FT1222

FT1304

FT1306

FT1307

FT1309

FT1310

FT1313

CH return pipe

CH return sensor

3way valve

CH supply pipe

Pump

HEAT EXCHANGER ASSY

Exhaust Pipe

Exhaust sensor BK

Exhaust overheat sensor

Heat Exchanger Ass'y

Overheat sensor

Burner

Page 77

Notes:


Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement.


800.900.9276 • Fax 800.559.1583

Headquarters:

20


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 1503 Document 1318

Laars MFTHW Installation And Operation Instructions Manual

Installation and Operation Instructions Document 1318

Installation and Operation

Instructions for

ASCOT

Wall-Mounted, Modulating

Gas, Condensing, Combination Boiler

Model MFTCW

140,000 BTU/hr

•

Natural Gas (NG) - Factory Configuration

•

Propane Gas (LP) - Field-Convertible

SECTION 1

SECTION 2

Product Accessories

Product Characteristics

SECTION 3

Safety Regulations

SECTION 4

Installation

SECTION 5

Control Display and Operation

SECTION 6

Error Codes

SECTION 7

Trouble Shooting

SECTION 8

Maintenance

SECTION 9

Installation Check

SECTION 10

Repair Part Diagram

SECTION 1

Product Accessories

1.1 Introduction

1.2 Included with the Appliance

Item Description Qty

LAARS Wall Mounted,

Combination Boiler

MFTCW140

Installation Instructions and

Users Manual

Condensate Hose

Wall Mount Bracket

2 types of Wall Anchors

Pressure Relief Valve

(CH LINE 3/4˝ 30psi)

Model: CASH ACME F-82

3” Mesh Screens

4.5 GPM Flow Restrictor

Dark Blue

1.2 Included with the Appliance (continued)

Items

Propane Conversion Orifice

Descriptions

Qty

Outdoor Sensor with screws and anchors

1/2” x 3/4” Bell Coupling for Gas Line

Product Characteristics

2.1 Model Nomenclature

2.2 Specifications

Document 4288

MFTCW140

MFTCW140

20.

21.

2.3 Dimensions

2.4 Names of Components

2.5 Product Flow Paths and Characteristics

2.5.1 Central Heating flow. Combination Boiler Heating Mode.

2.5 Product Flow Paths and Characteristics

2.5.2 Domestic Hot Water flow. Combination Boiler Domestic Hot Water Mode.

Water Outlet Water Inlet

.

Safety Regulations

3.1 Safety Symbols

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.

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION