Laars Mini-Therm JVS Installation And Operation Instructions Manual

Installation and Operation Instructions Document 1254

JVH

Installation and

Operation Instructions for

M ini -T herM

Residential

Gas-Fired

Hydronic Boilers

Models JVH, JVS

JVS

Sizes 50-225

U.S. Patent No. 1,609,692

Canada Patent No. 383,318

Vent damper is optional in some provinces of Canada..

These instructions are to be stored next to the boiler for reference purposes.

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water boiler 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 ni d’autres vapeurs ou liquides inflammables dans le voisinage 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 dansle bâtiment où vous vous trouvez.

• 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.

Page 2

TABLE OF CONTENTS

SECTION 1.

General Information

1A. Introduction ....................................................3

1B. Warranty ........................................................3

1C. Heater Identification .......................................

4

SECTION 2.

Boiler Assembly & Placement

2A. Field Assembly ..............................................

4

2B. Boiler Placement ...........................................

5

2C. Flooring ..........................................................

5

2D. Dimensional Information ................................6

2E. Clearance / Closet Installations .....................8

SECTION 3.

Air and Venting

3A. Combustion Air Supply ..................................9

3B. Venting .........................................................

10

3C. Vertical Venting - Category I ........................

11

3D-1 Horizontal Venting - Category III ..................

12

3D-2 Venting Connections ....................................

12

3D-3 Vent Terminations ........................................13

3E. Common Venting System ............................13

SECTION 4.

Gas Connections

4A. Gas Supply and Piping ................................13

4B. Special Precautions for LP .........................

15

SECTION 5.

Water Connections

5A. Water Piping ................................................

15

5B. By-pass Piping .............................................

17

5C. Adjusting the bypass ...................................

17

5D. Alternate Auto-Bypass Operation ................

17

5E. Flow Requirements ......................................18

5F. Chilled Water Systems ................................18

5G. Oxygen Permeable Systems .......................18

5H. Anti-Freeze ..................................................18

LAARS Heating Systems

SECTION 6.

6A. Electrical Wiring ...........................................

20

6B. Outdoor Reset .............................................

20

SECTION 7.

7A. Filling the System ........................................23

SECTION 8.

Operating Procedures

8A. System Start-up ...........................................23

8B. Sequence of Operation ................................23

8C. Operating Instructions, JVH .........................

25

8D. Operating Instructions, JVS .........................26

8E. Operating Temperature Control ...................

27

SECTION 9.

9A. Maintenance ................................................28

9B. Electrical Troubleshooting ...........................29

SECTION 10. Replacement Parts

10A. Glossary of Terms ........................................32

10B. Parts List JVH ..............................................34

10C. Parts List JVS ..............................................36

Mini-Therm JV

SECTION 1.

General Information

1A. Introduction

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

Model JV low pressure, copper tube hydronic boilers.

These boilers are available in two configurations; the

JVH has a hot surface pilot ignition system and the

JVS has an electronic intermittent ignition device

(I.I.D.). Look for the model designation on the rating plate, which can be found on top of the boiler.

All application and installation procedures should be reviewed completely before proceeding with the installation. Consult the Laars factory, or local factory representative, with any problems or questions regarding this equipment. Experience has shown that most operating problems are caused by improper installation.

WARNING

This hydronic boiler must be installed in accordance with the procedures detailed in this manual, or the Laars warranty will be voided. The installation must conform to the requirements of the local jurisdiction having authority, and, in the

United States, to the latest edition of the National

Fuel Gas Code, ANSI Z223.1. In Canada, the installation must conform with the latest edition of

CAN/CGA B149.1 OR .2 installation codes for gas burning appliances, and/or local codes.

Any modifications to the boiler, its gas controls, gas orifices, wiring or draft inducer assembly may void the warranty. If field conditions require modifications, consult the factory representative before initiating such modifications.

ATTENTION

L' eau chaude chaudière doit être installé en conformité avec les procédures détaillées dans ce manuel, ou le Laars garantie sera annulée.

L'installation doit être conforme aux exigences de la juridiction locale ayant l'autorité, et, aux

ÉTATS-UNIS , à la dernière édition du National gaz carburant Code, ANSI Z223.1. Au Canada, l'installation doit être conforme à la plus récente

édition de la norme CAN/CGA B149.1 ou .2 codes d'installation gaz pour appareils de combustion et/ ou codes locaux.

Page 3

1B. Warranty

The Laars Model JV boilers are covered by a limited warranty. The owner should fill out the warranty registration card and return it to Laars.

All warranty claims must be made to an authorized

Laars representative or directly to the factory. Claims must include the boiler serial number and model (this information can be found on the rating plate), installation date, and name of the installer. Shipping costs are not included in the warranty coverage.

Some accessory items are shipped in separate packages. Verify receipt of all packages listed on the packing slip. Inspect everything for damage immediately upon delivery, and advise the carrier of any shortages or damage. Any such claims should be filed with the carrier. The carrier, not the shipper, is responsible for shortages and damage to the shipment whether visible or concealed.

The warranty does not cover damage caused by improper assembly installation, operation or field modification.

Page 4 LAARS Heating Systems

1C. Heater Identification

Consult the rating plate on the boiler. The following example simplifies the heater identification:

1 2

J V

3 4 5 6 7 8

MODEL

J V

IGNIT

SYST

S

H

SIZE

0 5 0

0 7 5

1 0 0

1 2 5

1 6 0

2 2 5

FUEL

N

P

FIRING

SYST

C

D

K

Table 1. Boiler Model Identification.

JVH

1 st and

2 nd

C haraCters

(s eries

n ame

)

JV = m ini

-t herm

3 rd

C haraCter

(i gnition

s ystem

) s = s park

i gnition h = h ot

s urfaCe

p ilot

4 th thru

6 th

C haraCters

(s ize

) i nput

mBtu / h

7 th

C haraCter

( fuel

) n = n atural

g as p = p ropane

g as

8 th

C haraCter

(f iring

s ystem

)

C = o n

/ o ff

9 th

C haraCter

(C onstruCtion

o ption

) s = s tandard

10 th

C haraCter

(a ltitude in

f eet

) s = (0 - 2,000) n atural or

(0 - 5,000) p ropane h = (2,001 - 5,000) n atural i = (5,001 - 8,000) n atural and

p ropane

J = (8,001 - 10,000 n atural and

p ropane

11 th

C haraCter

(C ountry

) u = usa & C anada

12 th

C haraCter

(r eVision

)

2 = s eCond

r eVision

9 10

CONST

OPTION

S

P

I

J

ALTITUDE

S

H

I

J

11

U

12

2

COUNTRY

U

REVISION

2

JVS

1 st and

2 nd

C haraCters

(s eries

n ame

)

JV = m ini

-t herm

3 rd

C haraCter

(i gnition

s ystem

) s = s park

i gnition h = h ot

s urfaCe

p ilot

4 th thru

6 th

C haraCters

(s ize

) i nput

mBtu / h

7 th

C haraCter

( fuel

) n = n atural

g as p = p ropane

g as

8 th

C haraCter

(f iring

s ystem

)

D = on

/ off

(JVs 050-75) k = two

stage

(JVs 100-225)

9 th

C haraCter

(C onstruCtion

o ption

) i = (s tandard

)

J = p ump

(050-125 only

)

10 th

C haraCter

(a ltitude in

f eet

) s = (0 - 2,000) n atural or

(0 - 5,000) p ropane h = (2,001 - 5,000) n atural i = (5,001 - 8,000) n atural and

p ropane

J = (8,001 - 10,000 n atural and

p ropane

11 th

C haraCter

(C ountry

) u = usa & C anada

12 th

C haraCter

(r eVision

)

2 = s eCond

r eVision

SECTION 2.

Boiler Assembly and Placement

2A. Field Assembly

These boilers are available in two configurations; the

JVH has a hot surface ignition pilot and integral draft fan, and the JVS has an electronic intermittent ignition device (I.I.D.). Look for the model designation on the rating plate, which can be found on top of the boiler in the right rear corner.

The Laars automatic vent dampers are standard on all JVS models. The Laars side wall power venters can be used on JVS models. Special instructions for their installation are included in the vent damper and power venter package. Read them carefully before installation.

Mini-Therm JV Page 5

Vent Damper (JVS only):

1. Mini-Therm JVS boilers have built-in draft diverter for natural draft operation.

2. Find the vent damper box which is located in the boiler package.

3. Install the vent damper directly to the top of the draft diverter outlet with the damper operator facing to the front of the boiler, and with the flow direction arrow pointing upward. Use the vent damper wire harness provided with the boiler to connect the vent damper to the boiler. The bracket end of the harness should be connected to the vent damper actuator.

4. For Model JVS only: Install the metal plug provided with the vent damper onto the damper plate hole.

5. Do not modify the automatic vent damper device.

It is very important that no other vents are closed.

Provide at least six inches clearance between the automatic vent damper and combustible construction, and be sure to allow access for servicing the damper.

Temperature/Pressure Gauge: Install the temp/ pressure gauge provided in the parts box.

2B. Boiler Placement

1. The boiler must be placed to provide clearances on all sides for maintenance and inspection. There must also be minimum distances maintained from combustible surfaces. Avoid locations which can be damaged by water or moisture.

2. A minimum of 15" (381mm) access must be available in front of the boiler for burner tray removal. Consult local codes for clearances to hot water pipes and accessories.

3. If the boiler is to be installed in a garage, all burners and burner ignition devices must have a minimum 18" (457mm) clearance above the floor.

4. Boilers can be installed in a closet as long as the minimum clearances shown in Table 2 are observed. Special attention should be paid to clearances between the front of the boiler and the closet door when it is closed (see Figure 1) .

WARNING

This boiler is intended for indoor installation only.

Do not install this boiler in a location subject to negative pressure, or improper operation will occur.

Avertissement

Cette chaudière est destiné pour une installation intérieure uniquement. Ne pas installer cette chaudière dans un endroit soumis à pression négative, ou fonctionnement incorrect se produira

2C. Flooring

JVS model boilers can only be installed on noncombustible flooring.

JVH model boilers are designed and certified for installation on a combustible floor.

All boilers must be installed on a level floor and must NEVER be installed on carpeting.

NEVER store objects on or around the boiler.

Noncombustible flooring is defined as flooring material and surface finish not capable of being ignited and burning and with no combustible materials against the underside. Acceptable materials are those consisting entirely of a combination of steel, iron, brick, tile, concrete, slate, glass or plaster.

The JVS model boilers can be installed on a combustible floor if a noncombustible base assembly, available from Laars, is used.

See the JVS

Parts List at the back of this manual for the appropriate

Noncombustible Base Kit part number.

Figure 4. Typical Combustible Floor Installation.

As an alternative to the Laars Noncombustible Base

Kit, in the United States the National Fuel Gas

Code allows a heater to be placed on a combustible surface when there is a platform under the heater made of hollow masonry no less than 4 inches (102 millimeters [mm]) thick, covered with sheet metal at least 24 gauge thick and extending beyond the full

Caution

Do not force motor operation when operator is fastened to the damper by moving the damper blade, turning the shaft or by turning the position indicator.

Attention

Ne pas tourner le registre manuellement avec ou sans courant électrique ou le moteur sera endommagé.

Page 6 JVH

2D. JVH Dimensional Information

LAARS Heating Systems

Dimensions in

C B 7

180

6

152

2.4

61

25

635

24

610

50

75

100

125

160

225

Size A B C

in.

mm in.

mm in.

mm

13-3/8

13-3/8

16-7/8

16-7/8

20-3/8

25-5/8

340

340

429

429

518

651

3-1/8

2-1/4

5-3/4

5-1/2

7-1/4

10

79

57

146

140

184

254

2-7/8

2

2-7/8

2

2

2

73

51

73

51

51

51

JVH Dimensions

Water

Connection

Gas

Connection

1-1/4

1-1/4

1-1/4

1-1/4

1-1/4

1-1/4

1/2

1/2

1/2

1/2

1/2

3/4

7

180

9 -1/4

240

C B

2D. JVS Dimensional Information

Dimensions in

7

180

6

152

2.4

61

25

635

Page 7

24

610

7

180

9 -1/4

240

Size A B C D E V

Water

Conn

Gas

Conn in. mm in. mm in. mm in. mm in. mm in. mm 1-1/4 1/2

50 13-3/8 340 27-3/4 710 23-5/8 600 21-3/4 550 26-1/2 670 4 10 1-1/4 1/2

75 13-3/8 340 27-3/4 710 24-1/8 610 21-3/4 550 27-1/2 700 5 13

100 16-7/8 430 28-3/4 730 24-1/8 610 22-3/4 580 27-1/2 700 5 13

125 16-7/8 430 28-3/4 730 23-5/8 600 22-3/4 580 27-1/2 700 6 15

1-1/4

1-1/4

1-1/4

1/2

1/2

1/2

160 20-3/8 518 28-3/4 730 23-5/8 600 22-3/4 580 27-1/2 700 6 15

225 25-5/8 651 31-1/2 800 23-1/4 590 23-3/4 630 27-1/2 700 7 18

1-1/4 1/2

1-1/4 3/4

JVS Dimensions

Page 8 LAARS Heating Systems width and depth of the heater by at least 12 inches

(305mm) in all directions. The masonry must be laid with ends unsealed, and joints matched to provide free circulation of air from side to side through the masonry (see Figure 4). If the boiler is installed in a carpeted alcove, the entire floor of the alcove must be covered by a noncombustible platform.

2E. Clearance / Closet Installations

All Mini-Therm JV's can be installed in a closet as long as the minimum clearances are observed.

See Table 2JVH and Figure 1JVH for clearances required for the Mini-Therm JVH.

See Table 2JVS and Figure 1JVS for clearances required for the Mini-Therm JVS

Special attention should be paid to clearances between the front of the boiler and the closet door when it is closed.

Consult the American National Standard Z21.13 for more information concerning closet installations. In

Canada, refer to the latest edition of CSA-B149.1.

Boiler Sizes

Clearances

Left side

Right side

Rear

Front

Flue (using B-vent)

Top

50 - 225 in cm

2 5

5 15

2 5

4 10

6 15

23 58

Boiler Sizes

Clearances

Left side

Right side

Rear

Front

Flue

Top

50 - 125 in cm

6 15

6 15

6 15

4 10

6 15

23 58

160 - 225 in cm

6 15

6 15

6 15

4 10

6 15

36 91

Table 2JVH Minimum Boiler Clearances Table 2JVS Minimum Boiler Clearances

Note: Clearances listed are manufacturer’s tested values. These are given as minimum values. Where local and national codes apply, and values are different than those listed use the greater value to ensure safe operation.

Minimum Boiler Clearances from Combustible Surfaces.

Dégagements Minimaux à Assurer Entre Ics Parois de L’appareil et leo Constructions Combustibles

A 2

(51)

2

(51)

TOP

VIEW

Air

Openings

6

(152)

MIN

6

(152)

5

(127)

B

SIDE

VIEW

Figure 1JVH. Closet Installation.

Dimensions in inches (mm).

6 15

4*

10

6 15

Dimensions in inches cm .

*6" for models JV160 to JV225.

Figure 1JVS Closet Installation

6 15

Mini-Therm JV Page 9

SECTION 3.

Air and Venting

3A. Combustion Air Supply

The boiler location must provide sufficient air supply for proper combustion, and ventilation of the surrounding area as outlined in the latest edition of U.S. ANSI standard Z223.1 or in Canada, CAN/

CGA-B149.1 or .2, and any local codes that may be applicable.

In general, these requirements specify that the boiler rooms which represent confined spaces should be provided with two permanent air supply openings; one within 12 inches (305mm) of the ceiling, the other within 12 inches (305mm) of the floor.

NOTE: In Canada, follow Canadian Standard,

CAN/CGA-B149 or local codes.

Outside Air Supply: When combustion air is supplied directly through an outside wall, each opening should have a minimum free area of one square inch per 4,000 BTU/h (6 sq. cm per 1.2 kW) input of the total input rating of all appliances in the enclosed area.

Inside Air Supply: When combustion is supplied from inside the building, each opening should have a minimum free area of one square inch per 1,000

BTU/h (6 sq. cm per 0.3 kW) input of the total input rating of all appliances in the enclosed area. These openings should never be less than 100 square inches

(645 sq. cm).

Boiler Size

50

75

100

125

160

225

25

32

40

60

Outside Air Area sq. in sq. cm

15

20

97

129

161

206

258

387

Inside Air Area sq. in.

sq. cm

100

100

645

645

100

125

160

225

645

807

1032

1452

*Area indicated is for one of two openings: one at floor level and one at the ceiling, so the total net free area would be double the figures shown. For special conditions, refer to

NFPA54 ANSI Z223.1. In Canada, refer to the National

Standard CAN1-B149.1 or .2, which differs from this table.

NOTE: Check with louver manufacturers for Net Free Area of

Louvers. Correct for screen resistance to the Net Free Area if a screen is used.

Table 5. Minimum Recommended

Air Supply to Boiler Room

Exhaust Fans or Vents: Any equipment which exhausts air from the boiler room can deplete the combustion air supply or reverse the natural draft action of venting system. This could cause flue products to accumulate in the boiler room. Additional air must be supplied to compensate for such exhaust.

The information in Table 5 is not applicable in installations where exhaust fans or blowers of any type are used. Such installations must be designed by qualified engineers.

If a blower or fan is used to supply air to the boiler room, the installer should make sure it does not create drafts which could cause nuisance shutdowns. If a blower is necessary to provide adequate combustion air to the boiler, a suitable switch or equivalent must

CHIMNEY

CHIMNEY

LINER

THIMBLE

CLEANOUT

1/4"

PER FT.

(20mm PER M)

SLOPE

VENT

SYSTEM

BOILER

Figure 2. Chimney Venting.

LINER

THIMBLE

CLEANOUT

1/4"

PER FT.

(20mm PER M)

SLOPE

VENT

SYSTEM

12" (305mm)

BOILER

Figure 3. Vertical Venting.

Page 10 LAARS Heating Systems

10 (3.0) OR

LESS MORE THAN 10

(3.0)

RIDGE

2 (0.6) MIN.

WALL OR

PARAPET

CHIMNEY

10 (3.0)

OR LESS

2 (0.6)

MIN.

CHIMNEY

Figure 4. Vertical Vent Termination.

3 (0.9)

MIN.

3 (0.9)

MIN.

3 (0.9)

MIN.

TERMINATION

10 FT. (3.0m)

OR LESS FROM RIDGE,

WALL OR PARAPET

NOTE: NO HEIGHT

ABOVE PARAPET

REQUIRED WHEN

FROM WALLS OR

PARAPET IS MORE

THAN 10 FT. (3.0m)

WALL OR

PARAPET

CHIMNEY

RIDGE

MORE THAN 10

(3.0)

10 (3.0)

3 (0.9)

MIN.

Dimensions in feet (m).

2 (0.6)

MIN.

CHIMNEY be wired into the boiler control circuit to prevent the boiler from firing unless the blower is operating.

The boiler must be completely isolated and protected from any source of corrosive chemical fumes such as those emitted by trichloroethylene, perchloroethylene, chlorine, etc.

3B. Venting

Vent Categories: Mini-Therm JVS is a natural draft appliance for Category I venting only. JVH is a fan-assisted product that can be vented vertically in a properly-designed Category I system, or can be vented horizontally as a Category III appliance, per this installation manual.

WARNING

This boiler must be vented in accordance with

Part 7, Venting of Equipment, of the latest edition of the National Fuel Gas code, ANSI Z223.1 and all applicable local building codes. In Canada, follow CAN/CGA B149 Installation codes.

Improper venting of this appliance can result in excessive levels of carbon monoxide which can result in severe personal injury or death!

AVERTISSEMENT

Cette chaudière doit être ventilé, conformément aux dispositions de la partie 7, de la ventilation de l'équipement, de la dernière édition du National gaz carburant code, ANSI Z223.1 et tous les codes du bâtiment locaux. Au Canada, CAN/

CGA B149 codes d'installation. Une mauvaise ventilation de cet appareil peut entraîner des niveaux excessifs de monoxyde de carbone qui peut entraîner de graves blessures ou la mort!

The boiler vent collar must be fastened directly to an unobstructed vent pipe with rustproof sheet metal screws no longer than 1/2” (13mm) and located to prevent interference with the inducer damper.

Do not weld the vent pipe to the boiler collar. The weight of the stack must not rest on the boiler. The boiler top must be easily removable for normal boiler service and inspection.

IMPORTANT

Only JVH (induced draft) models may be side-wall vented per Section 3D without the addition of a properly sized and installed power venter.

JVS must be connected only using Category Type

I methods and materials per Section 3C. JVH may be connected per Category I or III (See Section 3D) methods and materials. See fuel gas code for more information regarding your venting application.

IMPORTANT

Seulement JVH (induits projet) modèles peut être paroi ventilé par chapitre 3D sans l'addition de la bonne taille et de puissance installée venter. JVS doivent être connectés uniquement en utilisant

Type de catégorie I méthodes et matériaux par

Section 3C. JVH peut être connecté par catégorie

I ou III (voir section 3D) Les méthodes et les matériaux. Voir gaz combustible code pour plus d'informations concernant votre application d'aération.

Avoid terminating boiler vents near air conditioning or air supply fans. The fans can pick up exhaust flue products from the boiler and return them to the building, creating a possible health hazard.

Avoid oversized vent pipe or extremely long runs

Mini-Therm JV of the pipe, which may cause excessive cooling and condensation.

3C. Vertical Venting - Category I

(JVS and JVH)

All venting must comply with fuel gas code and be installed by a licensed professional.

The Mini-Therm JVS or JVH series boiler can be vented into a masonry chimney, (see Figure 2) provided several conditions are met:

1. The chimney must have an appropriate tile lining that is clean, properly constructed and properly sized.

2. The chimney passage way shall be examined to ascertain that it is clear and free of obstructions.

WARNING

Do not store any chemical, cleaners, or other corrosive material near combustion air openings or in the room. Avoid locating dryer vents in the vicinity of combustion air openings. Failure to prevent corrosive materials from mixing with combustion air can result in reduced boiler life and unsafe boiler operation.

AVERTISSEMENT

N’entrepposer aucun produit chimique, produit nettoyant ou produit corrosif à proximité des bouches d’air de combustion ou dans la pièce.

Éviter de placer des tuyaux de ventilation pour sécheuse à proximité des bouches d’air de combustion. Le fait de laisser des maitières corrosives se mélanger à l’air de combustion risque de réduire le cycle de vie de l’appareil de chauffage et de compromettre son fonctionnement.

Page 11

3. If a chimney rebuild is required, it shall conform to nationally recognized standards (see National

Building Code or ANSI/NFPA 211).

4. The boiler must not be connected to a fireplace, wood stove or other solid fuel burning equipment.

5. When the boiler and a hot water heater are to be connected to the same chimney, they must have their own vent connector and enter the chimney at least 6” (152mm) apart.

IMPORTANT NOTE : Always provide a minimum clearance of 6” (152mm) between Type C (single wall) vent pipe and any combustible materials.

WARNING

Single wall vent pipe must NEVER pass through interior walls or through floors or ceilings! Failure to comply with this warning could result in a fire causing property damage, personal injury, or death!

AVERTISSEMENT

Paroi simple tuyau d'évent doit jamais passer par l'intérieur les murs ou par planchers ou plafonds

! Le non-respect de cet avertissement peut provoquer un incendie causant des dommages matériels ou corporels, ou de mort!

When installing the vent system, all applicable national and local codes must be followed! The use of thimbles, firestops and other protective devices, when penetrating combustible or noncombustible construction, must be in accordance with all applicable national and local codes.

VENT

TERMINAL

4 (1.2)

MIN.

12 (3.7)

MIN.

4 (1.2)

MIN.

VENT TERMINAL

3 (0.9)

MIN.

Dimensions in feet (m).

Figure 6. Horizontal Vent Termination.

VENT TERMINAL

CAULK JOINTS

ANCHORED

FASTENER

SEAL ENTIRE

CIRCUMFERENCE

OF JOINT

LESS THAN

10

(3.0)

FORCED

AIR INLET

6 (1.8) MIN.

GRADE

THIMBLE

SHEET METAL

SCREWS

VENT TERMINAL DETAIL

CAULK JOINTS

ANCHORED

FASTENER

EXHAUST

HOOD

Page 12 LAARS Heating Systems

Vertical vents of the induced draft JVH boilers must be installed in accordance with the code requirement for Category 1, Fan Assisted Appliances. Follow the requirements as indicated in the latest edition of ANSI

Z223.1/NFPA 54, sizing of Category I Venting System and Appendix G, or in Canada, follow the instruction of CAN/CGA-B149 installation code.

An unused lined chimney can be used as a raceway for single wall vent pipe, (see Figure 3) . Never run vent pipe through a flue that has another appliance attached to it.

3D-1. Horizontal Venting - Category III

(JVH only)

When venting is horizontal, or cannot meet the requirements of Category I, it can develop positive pressure and must be installed in accordance with this section and the specific vent manufacturer’s instructions. Common venting is not allowed in

Category III systems.

BOILER VENTING

DETAIL

OUTSIDE WALL

VENT

SYSTEM

SHEET METAL

SCREWS

THIMBLE

BOILER

* 12" (305mm)

MIN.

CAULK ENTIRE

JOINT, INCLUDING

THE SCREWS

VENT TERMINAL

HOOD

Figure 5. Horizontal Venting.

*WHEN HORIZONTAL RUN

EXCEEDS 5 FT. (1.5m)

3D-2. Vent Connections (JVH only)

The vent system must be gas tight . All seams and joints must be sealed with silicone sealant or adhesive tape having a minimum temperature rating of 400°F

(204ºC) .

Use at least three corrosion resistant screws at each slip joint, when required.

For best results, horizontal vent systems should be as short and straight as possible. Material of vent connectors shall be as follows:

Description

High Temperature

RTV

Manufacturer

Dow Corning

2" (51mm) wide

Aluminum foil tape

- adhesively backed

Venture

2" (51mm) wide

Aluminum foil tape 3M

- adhesively backed

Vent Sealing Materials.

Product

Trade Mate

Product

#3243

Product #433

Materials

In U.S.A.: UL type 304, 316 or 294-C stainless steel or equal 26 gauge minimum.

In Canada: Use "BH-Type" vent material certified to ULD-S636 Class I

(more than 135 ° C, but not more than 245 ° C flue gas temperature), made of AL29-4C stainless steel or equal.

Vent Length

Up to a maximum of 55' (17m) of equivalent pipe run

(including required elbows).

Do not use plastic venting of any kind.

The boiler vent collar must be fastened to the vent pipe with rustproof metal screws no longer than 1/2”

(13mm) and sealed with high temperature (500ºF /

260ºC) silicone sealant. For larger diameter vent pipes, use a sealed reducer fastened directly to the boiler collar and seal all joints as indicated in Figure 5 .

Allow the sealant to cure for 24 hours before operating the boiler.

The entire vent system must not exceed the size specified in Table 6.

The following criteria must be observed:

1. Attach a vertical pipe at least 12” (305mm) high to the boiler outlet before the horizontal run if run exceeds 5 feet (see Figure 5 ).

2. Support the vent run at 3’ (.9m) intervals with overhead hangers.

Size

50 - 160

225

225 in.

Diameter mm

4 102

4

6

102

152

No. of

Elbows

4

2

4

Horizontal Run Length ft.

m

35 10.7

10

35

3.0

10.7

For each elbow eliminated, add 5’ (1.5m) of allowable vent.

Table 6. Horizontal Venting Configuration.

3. Pitch down the vent run, toward the vent terminal

(hood), 1/4” per foot (20mm per meter).

4. Do not locate any joint screws at the bottom of the vent run.

3D-3. Vent Termination (JVH only)

The side wall vent terminal (hood), Laars Part

Mini-Therm JV

Number D2004300 (4”) or D2000401 (6”), must be used when the boiler is vented through a side wall.

It provides a means of installing vent pipe through the building wall, and must be located in accordance with ANSI Z223.1/NFPA 54, or in Canada CAN/

CGA-B149 and local applicable codes,

(see Figure 6 ) .

Locate the vent terminal so that it cannot be blocked by snow. Most codes requires termination of at least 12” (305mm) above grade, but the installer must follow local codes.

3E. Common Venting System

WARNING

Operation of appliances with a blocked common vent may lead to serious injury or death. Safety devices must be implemented to prevent blocked common vent operation. If safe operation of all appliances connected to a common vent cannot be assured, including prevention of spillage of flue gasses into living spaces, common venting should not be applied, and appliances should each be vented separately.

AVERTISSEMENT

Le fonctionnement des appareils avec un système d’évacuation bloqué peut provoquer des blessures graves, voire la mort. Des dispositifs de sécurité doivent être installés pour éviter le blocage des systèmes d’évacuation. Si le fonctionnement de tous les appareils connectés

à un système d’évacuation commun ne peut pas être assuré, y compris la prévention de la dispersion des gaz toxiques dans les espaces habités, on ne devrait pas installer un système d’évacuation commun et chaque appareil devrait

être ventilé séparément.

When an existing boiler is removed from a common venting system, the common venting system is likely to be too large for proper venting of the appliances remaining connected to it.

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 unused 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 or other deficiencies which could cause an unsafe condition.

Page 13

3. Insofar as it 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 gas burning appliance not connected to the common venting system. Turn bathroom exhausts, so they will operate at maximum speed.

Do not operate a summer exhaust fan. Close fireplace dampers.

4. Place in operation the appliance being inspected. Follow the lighting instructions.

Adjust thermostat so appliance will operate continuously.

5. Test for spillage at the burner opening after five minutes of main burner operation.

6. After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas burning appliance to their previous conditions of use.

7. Any improper operation of the common venting system should be corrected so the installation conforms with the National Fuel Gas Code,

ANSI Z223.1. When re-sizing any portion of the common venting system, the common venting system should be re-sized to approach the minimum size as determined using the appropriate tables in Appendix G in the National

Fuel Gas Code, ANSI Z223.1.

SECTION 4.

Gas Connections

4A Gas Supply and Piping

WARNING

The Mini-Therm JVS and JVH boilers are designed for use with either natural gas or LP gas. Check the rating plate to be sure that the boiler is designed to use the type of gas being supplied. DO NOT ATTEMPT TO CONVERT

THIS HEATER FOR USE WITH ANY OTHER

TYPE OF FUEL.

AVERTISSEMENT

Les appareils de chauffage à faibles sont conçus pour être utillsés avec du gaz naturel ou du gaz de pétrole liquéfié (GPL). Vérifiez l’information inscrite sur la plaque signalétique du pour vous assurer que l’appareil est conçu pour le type de gaz fourni. NE PAS ESSAYER DE CONVERTIR

CET APPAREIL À UN AUTRE TYPE DE GAZ.\

Page 14

1. Gas piping installation must be in accordance with the latest edition of ANSI Z223.1 and all local codes. In Canada, the installation must be in accordance with CSA-B149.1 and all local codes that apply.

2. Check the gas supply to be sure that it is the same as the gas indicated on the boiler’s plate.

Mini-Therm JVS and JVH boilers, as shipped from the factory, are certified to operate within the altitude range indicated on the rating plate.

If a field conversion to a different altitude range or different gas should be necessary, conversion parts are available. Contact a Laars representative or the factory for the correct part numbers to order for conversions

Caution

Permanent damage to the gas valve will occur if the following procedures are not followed.

Attention

Vous endommagerez la soupape de gaz si vous ne respectez pas les procédures suivantes.

3. Use the figures in Table 7 to size the gas inlet piping from the gas meter to the heater. Check all local codes for compliance before installing the heater.

0-50

0-15m

Boiler Size

Distance

From Gas

Meter

50 75 100 125 160 225

Pipe Size

1/2 3/4 3/4 3/4 1 1

Supply Pressure

Natural Gas

LP Gas

Minimum Maximum

5.5 Inches WC 10.5 Inches WC

(1.3 kPa) (2.5 kPa)

10.0 Inches WC 13.0 Inches WC

(2.4 kPa) (3.1 kPa)

Table 8. Gas Supply Pressure Requirements.

50-100'

15-30m

3/4 3/4 3/4 1 1 1-1/4

100-200'

30-60m

3/4 1 1 1 1-1/4 1-1/4

* Note: These figures are for Natural Gas (.65 Sp. Gr.), and are based on 1/2" water column pressure drop. Check supply pressure with a manometer, and local code requirements for variations. For LPG, reduce pipe diameter one size, but main tain a 1/2" minimum diameter. A 'normal' number of Tees and elbows have been taken into allowance.

Table 7. Natural Gas Pipe Size Requirements*

Gas Supply

Inlet

Tee

Fitting

3 in.

(76mm) Min.

LAARS Heating Systems

Nipple

To Equipment

Inlet

Cap

Figure 7. Typical design for a sediment trap/drip leg.

TO BOILER

HORIZONTAL

DROP

RISER

TO BOILER

3" (76mm)

MIN.

Figure 8. Gas Supply Piping.

SEDIMENT TRAP

OR DRIP LEG SEDIMENT TRAP

OR DRIP LEG

3" (76mm)

MIN.

Mini-Therm JV

4. A sediment trap (drip leg) must be installed ahead of the gas controls (see Figure 8) . Fit the trap with a threaded cap which can be removed for cleaning.

5. Install a manual gas shutoff valve for service and safety. Do not use a restrictive gas cock. Flexible gas connectors, if used, must be CSA rated for the total input rating of the boiler.

6. Disconnect the boiler and its individual shutoff valve from the gas supply system during pressure testing of the system at pressures higher than 1/2 pounds per square inch (psi) (3.45 kilopascals

[kPa]). If the test pressure is equal to or less than

1/2 psi (3.45 kPa), close the manual shutoff valve on the heater during the piping pressure test.

7. If the gas supply pressure is less than required, check for undersized pipe between the meter and the boiler, a restrictive fitting, or an undersized gas meter. Gas supply pressures to the heater are listed in Table 5.

NOTE: The maximum inlet gas pressure must not exceed the specified value. The minimum value listed is for the purpose of input adjustment. Refer to Table 8.

NOTE : The boiler and all other gas appliances sharing the boiler gas supply line must be firing at maximum capacity to properly measure the inlet supply pressure. Low gas pressure could be an indication of an undersize gas meter and/or obstructed gas supply line.

8. The correct high fire burner manifold gas pressure is stamped on the rating plate. The regulator is pre-set at the factory, and normally requires no further adjustment. For two-stage units (JVS 100-225) be sure unit is able to fire at both high and low fire.

9. Before operating the boiler, the complete gas supply system and all connections must be tested for leaks using a leak detector solution. Do not use an open flame.

Caution

Some leak test solutions (including soap and water) may cause corrosion or stress cracking.

Rinse the piping with water after testing.

Attention

Certaines solultions d’essai d’étanchéité (y compris l’eau et le savon) peuvent causer de la corrosion ou de la fissuration. Rincez les tuyaux à l’eau apprès l’essai d’étanchéité.

Page 15

4B Special Precautions for LP Gas

LP Gas is heavier than air and can therefore more readily collect or “pool” in enclosed areas if provision for proper ventilation is not made. Be sure to pay special attention to proper ventilation for LP gas.

Locate boilers a safe distance from LP gas cylinders and filling equipment. In the United States, consult the “National Fuel Gas Code” (NFPA 54 / ANSI

Z223.1, latest edition) or in Canada, the Propane

Installation Code (CSA-B149.1), any local codes and fire protection authorities about specific installation restrictions in your area.

SECTION 5.

Water Connections

5A. Water Piping

Figure 9 shows ‘typical’ plumbing installations. Be sure to provide unions and isolation valves at the boiler inlet and outlet so it can be isolated for service.

Check local codes for specific plumbing requirements before beginning the installation.

An ASME pressure relief valve is supplied on all JV boilers, and is pre-set at 30 PSI. The valve outlet piping must discharge to a drain. Under no circumstances should the relief valve piping be a closed circuit.

A pressure reducing valve (automatic feed) must be used to maintain system at constant proper pressure

(see Figure 9) . Supply properly installed purge valves to eliminate air from each circuit.

A drain valve is supplied with the boiler, and can be found in the plastic bag shipped with each boiler. This valve is to be installed on the lower right side of the boiler and is used for draining the unit. To drain the boiler completely, open the drain valve and remove the two drain plugs located on the lower left side of the boiler.

Be sure to include air vent devices located at the highest point in the system to eliminate trapped air, and an air elimination device near the outlet side of the

JV boiler. Manual vent valves are recommended.

Hot water piping should be supported by suitable hangers or floor stands, NOT by the boiler. Due to expansion and contraction of copper pipe, consideration should be given to the type of hangers used. Rigid hangers could transmit noise through the system caused by the piping sliding in the hangers.

It is recommended that padding be used when rigid hangers are installed.

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

A properly sized expansion tank must be included in the system.

Page 16 LAARS Heating Systems

Multi-Zone

Pump

System

JV

Single Circuit System

Multi-Zone

Valve System

JV

JV

Primary

Secondary

Multi-Zone

Pump System

JV

JV

Primary/Secondary Multi-Zone Valve System

Low Temperature Installation

KEY: PUMP CHECK VALVE

Figure 9. Typical Plumbing Installations.

VALVE

JV

Primary/Secondary Multi-Zone Valve System

ZONE VALVE UNION AUTO AIR BLEEDER

Mini-Therm JV Page 17

Size Flow Rate

15°F 8°C

Headloss gpm

50 5.3 l/s

0.3

ft

0.3

20°F

Flow Rate m gpm l/s

0.1

4 0.3

11°C ft

Headloss

0.2 m

0.1

75

100

125

160

225

8

10.7

13.3

17

24

0.5

0.7

0.8

1.1

1.5

0.6

1.3

2.2

2.5

5

0.2

0.4

0.7

0.8

1.5

6

8

10

12.8

18

0.4

0.5

0.6

0.8

1.1

0.3

0.7

1.3

1.8

3.1

0.1

0.2

0.4

0.5

0.9

25°F 14°C

Flow Rate Headloss gpm

3.2

4.8

6.4

8

10.2 l/s

0.2

0.3

0.4

0.5

0.6

ft

0.1

0.2

0.5

0.8

1.2 m

0

0.1

0.2

0.2

0.4

14.4 0.9

1.9 0.6

gpm = Water Flow in gallons per minute. l/s = Water flow in liters per second.

ft = Pressure drop (headloss) through the boiler in feet of water. m = Pressure drop (headloss) through the boiler in meters of water.

Notes: 1. Shaded area is the recommended flow and temperature rise.

2. Temperature rise and associated flow rates are based on high fire operation at the Normal Input Rate from the rating plate.

Table 9. Temperature Rise °F °C .

5B By-pass Piping

The following information and suggestions are made on by-pass piping as it affects the temperature rise at the boiler. A boiler temperature rise must be taken on all JV boiler installations. If the temperature rise exceeds 30°F (17°C) at full rate, it is an indication that the boiler is not receiving adequate water flow. Check the pump for any obstruction, replace the pump with a larger size where necessary, or install a system by-pass as indicated in Figures 9 and 10.

A full sized, 1¼" bypass with balancing valves is strongly recommended for all systems, and required when: 1) the boiler is installed without primarysecondary piping in a multiple zone system; 2) when the return water temperature can be expected to be lower than 120°F (44°C); or 3) whenever the system piping on the outlet side of the boiler may allow reduced flow through the heat exchanger, causing excessive temperature rise (see Section 5.2).

Note: Laars strongly recommends a primary/ secondary piping system for all installations, especially sizes 125, 160 and 225. In this system, a circulator is dedicated to pumping the boiler only. This circulator should be sized for the boiler head loss and flow rate.

All precautions must be taken by the installer to insure that a maximum temperature rise through the boiler does not exceed 30°F (17°C). The temperature rise on boilers installed in multi-zone systems using zone valves must be taken when the zone of the longest length and/or the zone of the highest head loss is open.

A full size, 1¼" diameter by-pass with balancing valve must be installed if a return water temperature below 120°F (44°C) is expected under operating conditions regardless of boiler size. This may be expected in many systems, including infloor radiant and snow melt systems.

5C Adjusting the bypass:

Refer to Figure 10 . Provide a means of measuring temperature on the inlet pipe to the boiler such as using a strap on or infrared thermometer. Starting with both balancing valves fully open, start the boiler.

Adjust the balancing valve on the return to the system slowly to provide 120°F (44°C) water at the inlet to the boiler, leaving the bypass balancing valve fully open. As the system warms up, this valve may need to be adjusted open. In rare cases, this valve will have to be kept fully open, and the bypass balancing valve adjusted toward closed to prevent heated bypass water from satisfying the call for heat when the system is up to temperature.

5D Alternate Auto-Bypass Operation

Use of the Laars thermostatic union, p/n 2400-030, can provide automatic bypass operation in primary

- secondary piped systems (but cannot be used when primary - secondary piping is not used). The thermostatic union is installed on the outlet piping, after the bypass assembly. It can be used in place of a balancing valve. It opens fully at 140°F (see Figure

10) . Contact the factory for more information.

Page 18 LAARS Heating Systems

From

System

Balancing

Valve

In

(Return)

Out

(Supply)

To

System

Balancing Valve or optional thermostatic union, Laars P/N

2400-030. (Primary/

Secondary only)

Left Side View

A full size by-pass must be installed.

Figure 10. By-pass Piping.

Drip

Leg

5E Flow Requirements

All high recovery, low volume water boilers must have adequate flow for efficient operation. Pump selection is critical to this goal, and pumps should be selected to provide for system design water temperature rise.

Table 9 details temperature rise and water flow (GPM) for the Mini-Therm boilers.

Damage from improper flow is not warranteed.

Failure to insure proper water flow through the heat exchanger of the boiler will void the Laars warranty.

Flow can be verified by measuring the difference in water temperatures between the boiler inlet and outlet. For example: For a JV-100 installation, the inlet water temperature is 160°F (71°C), and the outlet temperature is 180°F (82°C) at Normal Input Rate from the rating plate. That means there is a 20° (11°C) temperature rise through the boiler. According to

Table 9, that would indicate a flow rate of 8 GPM

(0.5L/S). Temperature rise must be measured with the longest (highest head) zone calling for heat alone.

Other factors to be considered before selecting a pump are pipe size, the number of fittings throughout the system, smoothness of the interior surface of the pipe, the quantity of water flowing through the pipe, whether a glycol solution is being used, and the total length of piping in the system. Table 10 provides example pump selection criteria using Type L copper piping, one zone valve and up to eight elbows for single zone systems. Consult the factory or a qualified system designer if you have more fittings or different size or type of pipe.

1/2" Pipe

Size Pump

H.P.

3/4" Pipe

Pump

H.P.

1" Pipe

Pump

H.P.

1-1/4" Pipe

Pump

H.P.

1/25 1/12 1/25 1/12 1/6 1/25 1/12 1/6 1/25 1/12 1/6

50 50 99 390 680

75

* * * * * * *

*

35 160 300 460 640

* * * * *

100

125

160

225

* *

77 150 260 330 620

* * * *

* *

27 80 140 170 360 600

* * *

* * *

25 72 57 160 330 190 480

*

* * * * * * *

110

*

69 330

*A circulator and/or primary/secondary piping are required. Consult factory.

1. Chart is based on 30°F (17°C) maximum temperature rise.

2. Calculations are based on Type L copper tubing with one zone valve and eight elbows.

3. Typical circulating pumps: 1 /

25

HP=Taco 007, B&G LR-20 or

SLC-25, Grundfos UP15-42F, or equivalent. 1

12, Grundfos UP26-42F, or equivalent.

Grundfos UP43-75, or equivalent.

1 /

6

/

12

HP=B&G LR-

HP=B&G series HV,

Table 10. Maximum Suggested Circuit Length in Feet.

5F Chilled Water Systems

If the boiler is installed in conjunction with refrigeration systems, it shall be installed so that the chilled medium is piped in parallel with the heating boiler with appropriate valves to prevent the chilled medium from entering the heating boiler.

When boiler piping is connected to heating coils, which are in close proximity to refrigerated air circulation, there must be flow control valves or other automatic methods to prevent gravity circulation of the boiler water during the cooling cycle.

5G Oxygen Permeable Systems

The JV boiler must not be direct connected to a heating system utilizing oxygen permeable tubing.

Provide a water-to-water heat exchanger between systems to prevent corrosion of ferrous metals such as the boiler’s piping wet walls, etc. Air elimination devices are not sufficient protection, and corrosion damage is not covered under the limited warranty.

5H Anti-Freeze

Non-toxic HVAC anti-freeze may be added to the hydronic system provided the concentration does not exceed 50%, and the anti-freeze contains an anti foamant and rust inhibitor. Follow the anti-freeze manufacturer’s recommendations for yearly or biannual replacement of system anti-freeze. Never use automotive anti-freeze in a boiler system.

Mini-Therm JV Page 19

The preferred piping configuration for JV boilers is always using primary/secondary piping.

There are some applications that are acceptable without primary/secondary piping, see below.

To

System

Pump

Tempering

Valve

Isolation Valve

LOW TEMP SYSTEMS

To

System Pump

JV

From

System

Tempering

Valve

Pump Isolation

Primary/Secondary

Valve

System Loop with Tempering Valve and Pump with Boiler Loop with Tempering Valve and Pump

Isolation

Valve

Auto

By-Pass

Valve

From

System

Pump Isolation

Valve

Primary/Secondary Piping with Automatic By-Pass

JV

To

System

Pump

Balancing

Valve

Balancing

Valve

Isolation Valve

JV

To

System Pump

Balancing

Valve

Isolation

Valve

Balancing

Valve

JV

From

System

Pump Isolation

Valve

Primary/Secondary Piping with Field Balancing

(for Fixed Low Return Temperatures)

To

System Pump

Variable Speed

Control

Isolation Valve

JV

From

System

To

System

Pump Isolation

Valve

Primary/Secondary Piping with By-Pass

(for Fixed Low Return Temperatures)

Laars

Thermostatic

Union

PN 2400-030

Isolation

Valve

Pump

Balancing

Valve

JV

120°+

From

System

Pump Isolation

Valve

Primary/Secondary Piping with Variable Speed Injection

To

System

Pump

From

System

Pump Isolation

Valve

Primary/Secondary Piping with Laars

Thermostatic Union as an Automatic Bypass

Tempering

Valve

NON-LOW TEMPERATURE SYSTEMS

(120°F+ Return Temps)

Isolation Valve

To

System Pump

JV

Isolation

Valve

JV

From

System Pump

Tempering Valve with System Loop

Valve and Boiler Loop Pump

Isolation

From

System

Pump Isolation

Valve

Simple Primary/Secondary Piping - Hydronic - Not Low Temp pressure (typically at the inlet of pump).

NOTE: Ball valves should not be used as balancing valves. Only use for shutoff apps.

Page 20

SECTION 6.

6A. Electrical Wiring

Follow these instructions to make the necessary initial electrical connections.

1. Remove the two screws attaching the front cover of the control box.

2. There are wires coiled in the area on the right side of the control box, supplied with wire nuts: black wires and white wires.

3. Follow the schematic in Figures 10A and 10B .

Remove the wire nut from the two sets of wires, and connect the hot lead from the 115V power supply, and the neutral lead to the white wires.

4. Attach the leads from the wall thermostat to the terminal strip, located on the left side of the control box.

5. Check the boiler wiring and pump for correct voltage, frequency and phase. If the pump circuit is other than 115V, be sure there is an appropriate transformer or relay installed. The pump relay is suitable for pumps of 1/3 HP or less (max 5A).

6. For systems with multiple zone pumps or valves

(see Figure 11).

A means of disconnecting the electrical supply must be provided within sight of the boiler. The pump and boiler must be wired as shown to insure that the pump is running whenever the boiler is firing.

Flow Switch: If the system includes a flow switch, it should be wired in series with the high-limit switch.

The boiler will not fire unless the pump is running and the flow switch is closed.

Field installed safety devices and operating controllers, such as valve end switches, relays, timers, can be connected to the boiler through the wall thermostat circuit. Do not exceed a draw of 40VA on the transformer secondary. A 2-Amp fuse is here to protect the transformer.

6B. Outdoor Reset.

To comply with Federal Law, the

Mini-Therm JV automatically sets water temperature based on outdoor temperature. A sensor (E2347400) supplied must be located outdoors yet out of direct sunlight. If not connected, the boiler may not be fully functional. Connect the sensor to the terminals labeled

"COM" and "OUT" located on the left side of the control box, using outdoor rated min 24 gauge wire.

LAARS Heating Systems

WARNING

The boiler must be electrically grounded in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements, with the latest edition of the national

Electrical Code, ANSI/NFPA 70, in the U.S. and with the latest edition of CSA C22.1 Canadian Electrical

Code, Part 1, in Canada. Do not rely on the gas or water piping to ground the metal parts of the boiler.

Plastic pipe or dielectric unions may isolate the boiler electrically. Service and maintenance personnel who work on or around the boiler may be standing on wet floors and could be electrocuted by an ungrounded boiler.

AVERTISSEMENT

La chaudière doit être mis à la terre conformément aux prescriptions de l'autorité ayant juridiction ou, en l'absence de telles exigences, avec la dernière

édition du national Electrical Code, ANSI/NFPA

70, aux ÉTATS-UNIS et à la dernière édition de la norme CSA C22.1 Code électrique canadien, partie

1, au Canada. Ne pas compter sur le gaz ou l'eau tuyauterie à la masse des pièces métalliques de la chaudière. Tuyau en plastique ou diélectrique les syndicats peuvent isoler la chaudière électrique.

Mini-Therm JV

HOT CHAUD 115/60HZ (220V50Hz OPTIONAL) POWER SUPPLY GROUNDING CONDUCTOR CABLE DE MISE A LA TERRE

THE BOILER WILL NOT OPERA TE W DAMPER. THE VENT DAMPER WIRE HARNESS MUST BE INSERTED INTO THE VENT DAMPER RECEPTACL SUPPLIED WITH VENT DAMPER JUMPER PLUG. DO NOT REMOVE JU PAS SANS LE VOLET MOTORISÉ AUTOMATIQUE. LE F AISCEAU DE CÂBLES DU VOLET MOTORISÉ DOIT ÊTRE INSÉRÉ DANS LA PRISE DU VOL SONT MUNIS D’UN CAVAL IER DE VOLET MOTORISÉ. NE PAS RETIR ER LE CAVALLIER À MOINS Q UE LE VOLET MOTORISÉ NE SOIT INST ALLÉ

Boiler Pump

TRANSFORMER 24V 115V

NOTE: 1.

FIELD WIRING

BOILER SENSOR

CONTROLLER SV9501, SV9601

FLAME ROLL OUT

HI LIMIT

PILOT HSI

Page 21

Page 22

HOT CHAUD 115/60Hz (220V/50Hz OPTIONAL) POWER SUPPLY GROUNDING CONDUCTOR CABLE DE MISE

THE BOILER WILL NOT OPERATE W DAMPER. THE VENT DAMPER WIRE HARNESS MUST BE INSERTED INTO THE VENT DAMPER RECEP SUPPLIED WITH VENT DAMPER JUMPER PLUG. DO NOT REMOVE JU PAS SANS LE VOLET MOTORISÉ AUTOMATIQUE. LE F AISCEAU DE CÂBLES DU VOLET MOTORISÉ DOIT ÊTRE INSÉRÉ DANS LA PRISE DU VOL SONT MUNIS D’UN CAVAL IER DE VOLET MOTORISÉ. NE PAS RETIR ER LE CAVALLIER À MOINS Q UE LE VOLET MOTORISÉ NE SOIT INST ALLÉ

Pompe À Chaleur (Fourni

NOTE: 1.

BOX DIVIDER

1 2 3 4

FIELD WIRING

IGNITION CONTROL

LAARS Heating Systems

Vent Safety

Mini-Therm JV

JVH

110 VAC

R

TEMP CONTROL

CONTROL

RLY

CONTROL

RLY

BK

R

BL

BOILER

PUMP

BR

INDUCER

FAN

TRANSFORMER

110V

FUSE

R

24V

TEMP CONTROL

4 2

GAS VALVE

1 3

TEMP

CONTROL

1

HI LIMIT

N

FAN

PROVING

ROLLOUT

SW

GAS

VALVE

4

GND

Figure 12A. JVH Ladder Diagram

JVH PILOT

1.25

(32) 0.16

(4)

110 VAC

BK

TEMP

CONTROL

R

BK

R

FUSE

2A

R

P

JVS

TRANSFORMER

PUMP

5A MAX

Page 23

N

TEMP CONTROL

4 2

DAMPER

HI LIMIT

BL

TEMP

CONTROL

1

POWER VENTER

BK

BLOCKED

VENT

BK

ROLLOUT

SW

BK

GND

MAIN BURNER

FLAME PATTERN

IGNITION CONTROL

6 5

BR

MV

Y

C

O

PV

TEMP CONTROL

3

BK

GAS VALVE

MV

MV/PV

PV

H 2nd STAGE ONLY

Figure 12B. JVS Ladder Diagram

1.25

(32)

JVS PILOT

0.10 TO 0.35

(3 to 9)

MINIMUM FLAME

LENGTH

0.50

(13)

Figure 13. Main Burner/Pilot Flame Pattern.

Dimensions in inches (mm).

MINIMUM FLAME

LENGTH

0.50

(13)

Page 24 LAARS Heating Systems

COM

HEAT

Wiring with Taco

Zone Valves

COM

HEAT

COM

HEAT

Wiring with

Honeywell

Zone Valves

Wiring with Multiple

Zone Pumps

Figure 11. Multiple Zone Wiring.

Mini-Therm JV

SECTION 7.

7A Filling the System

It is crucial to the efficient operation of the system that all air be removed from the circuit. For this reason, an air scoop and vent should be located close to the boiler outlet, and there should be a minimum distance between cold water feed and system purge valve.

1. When the system has been completely installed, close all air vents and open the makeup water valve. Allow the circuit to fill slowly.

2. If a make-up water pump is employed, adjust the pressure to provide a minimum of 12 psi (83kPa) at the highest point in the circuit. If a pressure regulator is also installed in the line, adjust it to the same pressure.

3. Close all valves. Purge one circuit at a time as follows: a. Open one circuit drain valve and let water drain out for at least 5 minutes. Be certain there are no air bubbles visible in the water stream before closing the drain valve.

b. Repeat this procedure for each circuit.

4. Open all valves after all circuits have been purged.

5. Run the system circulating pump for a minimum of 30 minutes with the boiler shut off.

6. Open all strainers in the system, and check for debris.

7. Recheck all air vents as described in Step 3.

8. Inspect the liquid level in the expansion tank, with the system full of water, and under normal operating pressure, to ensure proper water level in the expansion tank.

9. Start up boiler according to the procedures described in Section 2 and operate the system, including the pump, boiler, and radiation units, for one hour.

10. Recheck the water level in the expansion tank. If it exceeds 1/2 of the volume of the tank, open the tank drain and reduce the water level.

11. Shut down the entire system, and vent all radiation units and high points in the system.

12. Close the water makeup valve and check the strainer in the pressure reducing valve for sediment or debris. Reopen the water makeup valve.

13. Verify system pressure with the boiler pressure gauge before beginning regular operation.

14. Within 3 days of start-up, recheck and bleed all air vents and the expansion tank using these instructions.

Page 25

SECTION 8.

Operating Procedures

Before placing the boiler in operation, check and reset the safety shutoff devices. Once the boiler is connected to the gas and water piping and after all the requirements in previous pages have been met, follow these procedures:

8A. System Start-up

1. Verify that the pump system is operating properly: a. Shut off the manual gas valve located outside the boiler.

b. Raise the wall thermostat high enough to call for heat.

c. The pump should come on immediately. If it does not, test the electrical circuits.

2. Pilot and Main Burner Lighting: a. The JV boiler does not require manual lighting. The pilot is controlled by the automatic ignition system.

b. Different models of the JV boiler utilize various gas valves. Although the gas valves may have different control knobs, they are all similar in operation.

c. Understand and follow the operating instructions that are applicable to the type of ignition system installed on the boiler.

3. The pilot and main burners will automatically ignite when there is a call for heat.

8B. Sequence of Operation

1. Wall thermostat will call for heat.

2. Pump relay will turn on the circulating pump.

3. If water temperature is below the limit setting, the inducer motor relay will turn on the draft inducer (JVH).

4. Pressure switch will sense the fan (JVH only) operation and send 24 volts to the flame rollout switch.

5. In normal conditions, the flame rollout switch will be in a closed position. 24 volts will be sent to the gas valve/controller, the igniter will glow/spark and the pilot valve will open, lighting the pilot.

6. After pilot is proven to be lit, the main gas valve will open, the main burners will ignite and continue until either the primary control, hi-limit or wall thermostat opens.

7. When the wall thermostat is satisfied, the burners will shut off. The relays will turn off the draft inducer (JVH only) and the circulating pump.

When the room temperature falls below the wall thermostat setting, the cycle will repeat.

Page 26 LAARS Heating Systems

8C. Operating Instructions

Mini-Therm JVH

Mini-Therm JV Page 27

8D. Operating Instructions

Mini-Therm JVS

Mini-Therm JVi Page 31

Page 28

8.E Operating Temperature Control

Control Access Panel

Note: The Dip switch panel and LED panel can be found under the Control Access Panel after removing the bolts.

When a call for HEAT and/or DHW is present the boiler pump will turn on. Post purge can be selected via dip switch #5, Pump Post Purge Inactive (Off) /Active

3 min. (On). In the On position the pump will continue to run for 3 min after the last call has been satisfied.

When the dip switch is Off there is no post purge of the pump, the pump turns off immediately after the last call is removed. Laars strongly recommends using a pump post purge. During WWSD and a call for HEAT is present the pump will remain off.

Pump Exercising The control exercises the boiler pump every 3 days of inactivity. While the control is exercising the pump all LEDs will turn off and the power LED will flash for 10 seconds.

Staging (where applicable – factory setting ):

Dip #1 is used to select the number of stages: 2-Stage

(Off) / Single Stage (On).

For 2-stage operation, the first stage is cycled on

Proportional error and the second stage is cycled based on PI according to a fixed algorithm. No user adjustment is necessary.

Note: All stages are turned off when the water outlet temperature reaches the Maximum setting that is elected via dip switch #4, Boiler Maximum 210°F (Off) / 190°F

(On). Commercial boilers have dip switch #2 set for

‘Off’ to allow setpoint control. Utilize dial to set desired outlet temp.

Auto Boiler Target Setpoint: Space Heating:

The boiler target temperature is automatically determined from Space Heating and DHW requirements. Space heating is based on outdoor reset.

When both a Heat Call and a DHW Call are present at the same time, the control operates to provide the higher boiler target temperature.

Heating Curve (Outdoor Temperature Reset)

The control uses a linear heating curve to calculate a target setpoint. The following data are used to calculate the target setpoint from the outdoor temperature.

1. The heating curve or reset ratio (RR) is set by the potentiometer with a range of 0.4 to 3.6.

2. The room temperature is fixed at 70 deg F.

LAARS Heating Systems

3. Boiler target = 70 deg F + RR X

Outdoor

Temp F

(70 deg F - outdoor temp)

Heating Curve=Reset Ratio (RR)=

1.0

2.0

Boiler Target F

3.0

10

20

30

40

-30

-20

-10

0

50

60

70

170

160

150

140

130

130

210

190

170

150

130

WWSD OFF

210

190

160

130

Reset Ratio Calculation:

Boiler Target = 70 deg F + RR X

(70 deg F - outdoor temp)

DHW Operation The boiler target for DHW calls is fixed at 180 deg F.

Note: There is no control of a DHW pump, so the boiler pump runs with the call for DHW.

Limiting The boiler target is limited to a minimum and a maximum target to ensure that the water temperature does not exceed the limits.

1. Target Min - The boiler target minimum is the point at which the stages will start to turn on to maintain a minimum water temperature. The Boiler

Minimum water temperature is 130 deg F, regardless of other calculated targets. To ensure that the water temperature is greater than the Boiler Minimum water temperature the target is increased to allow the stages to cycle on by the Boiler Minimum water temperature,

Boiler Minimum target is set to Boiler Minimum + differential/2.

2. Target Max - The boiler target maximum is the point at which the stages will start to turn off to maintain a maximum water temperature. The Boiler

AND INSULATION switch #4: Boiler Maximum 210°F (Off) / 190°F (On).

To ensure that the water temperature is less than the

Boiler Maximum water temperature the target is decreased to allow the stages to cycle off by the Boiler

Maximum water temperature, Boiler Maximum target is set to Boiler Maximum - differential/2.

Auto Differential The control automatically adjusts differential to prevent short cycling and maximize the lifetime of components.

WWSD Operation Warm Weather Shutdown -

WWSD feature is selected via dip switch #3, WWSD

Inactive (Off) / Active 70°F (On). WWSD point is fixed at 70 deg F. Control exits WWSD when the outdoor temp falls to 65 F. When there is a call for

Mini-Therm JV

HEAT and the control is in WWSD the HEAT call will be ignored. When there is a call for DHW and the control is in WWSD the DHW call will be satisfied.

WWSD LED turns on when control detects WWSD.

Summary of Dip Switch Settings:

#1 Two Stage (Off) / Single Stage (On)

#2 (Off) / Outdoor Reset (On) (Note: Outdoor

Reset is required for residential operation)

#3 WWSD Inactive (Off) / Active 70°F (On)

#4 Boiler Maximum 210°F (Off) / 190°F (On)

#5 Pump Post Purge Inactive (Off) / Active 3 min.

(On)

LEDs State Description

1. Power

2. Heat – On = call for heat; Flashes for Boiler sensor error

3. DHW – On = call for DHW; Flashes for outdoor sensor error

4. WWSD – On = Outdoor Reset AND WWSD

Active AND control in WWSD; Flashes for outdoor sensor error, operation continues with fixed boiler target of 140°F.

Summary of Input Sensors:

1. Outdoor sensor - monitors the outside air temperature for outdoor reset mode

2. Boiler outlet sensor -monitors the water temperature of the boiler outlet supply

3. System Supply sensor - monitors the water temperature of the system supply

The boiler outlet sensor is required at all times. If the boiler outlet sensor has any fault then the control will flash an error and turns all stages off. The system supply sensor is optional and utilizes primary

/ secondary piping. If the system supply sensor has a fault then the control flashes an error message and operates using the boiler outlet sensor (system supply

= boiler outlet).

SECTION 9.

9A. Maintenance

1. Lubricate the water circulating pump per the instructions on the pump.

2. If a strainer is employed in a pressure reducing valve or the piping, clean it every six months.

3. At start-up, and periodically thereafter, the burner and pilot flames should be observed. If the flame has the appearance of “sooting” tips, check for debris near the orifices and call the service technician.

4. Ensure proper operation of the mechanical damper, mounted in the flue collar, by observing the damper handle. Be sure the handle swings

Page 29 when the draft inducer starts (depending on the boiler size, swing may be as little as 30°).

Remove any obstructions and clean around the pivot rod (handle) holes.

5. Inspect the venting system for obstruction, leakage or corrosion at least once a year.

6. Keep the boiler area clear and free from combustible materials, gasoline, and other flammable vapors and liquids.

7. Be sure that all combustion air and ventilation openings are unobstructed.

8. Upon completion of the installation, inspect the external surfaces of the heat exchanger for fouling based on the following schedule:

24 hours - 7 days - 30 days - 90 days

Once every six months thereafter.

9. If the boiler is not going to be used for long periods of time in locations where freezing occurs, it should be completely drained of all water. To accomplish this, there is a drain valve on the right side of the boiler which can be opened. This will drain the right side of the boiler. There are two plugs located on the left side of the heater which must be removed to drain that side. Both sides must be drained.

10. The gas and electric controls on the boiler are engineered for long life and dependable operation, but the safety of the equipment depends on their proper functioning. It is strongly recommended that the basic items listed below be inspected by a qualified service technician every year. a. Water temperature controls.

b. Pilot safety system.

c. Automatic gas valves.

d. Fan proving switch.

e. Inducer/Blower assembly.

f. Mechanical flue damper operation.

WARNING

The Warranty does not cover damage caused by lack of required maintenance, lack of water flow, or improper operating practices.

AVERTISSEMENT

La garantie ne couvre pas les dommages causés par l'absence d'entretien, absence de débit d'eau, ou pratiques de fonctionnement irrégulières

Fouling on the external surfaces of the heat exchanger is caused by incomplete combustion, and is a sign of venting and/or combustion air problems. The heat

Page 30 LAARS Heating Systems exchanger can be inspected by using a flashlight and placing a mirror under the burners. An alternate method is to remove the venting and top panel to inspect the exchanger from above. The vent system should be inspected at the same time. If cleaning is required: a. Shut off all power to the boiler.

b. Remove the venting top, flue collector, draft inducer assembly, and heat exchanger baffles.

c. Remove the burner tray.

d. Use a hand-operated spray bottle filled with water, and a wire brush to clean soot and loose scale from the underside of the heat exchanger. DO NOT USE COMPRESSED

AIR, HIGH PRESSURE WATER, OR A

GARDEN HOSE.

e. Clean any fallen debris from the bottom of the unit.

f. Check to make sure the burner ports and pilot assembly are free of debris before returning the burner tray to its original position.

g. Reassemble the boiler in reverse order, making sure to replace the heat exchanger baffles.

9B. Electrical Troubleshooting

1. Remove the control box cover on the front of the boiler.

2. Verify that 115 volts is reaching the boiler by testing across the black wire and the white wire on the transformer.

3. Verify 24 volts transformer output by placing the meter leads on the yellow and red wires. If

24 volts is not evident, replace the transformer.

Perform the following series of tests with one meter lead attached to the yellow wire on the transformer.

4. Place the second lead on the “HEAT” connection on the terminal board. Turn the wall thermostat high enough to call for heat. If the meter fails to register 24 volts, the thermostat or its circuit may be defective.

5. Place the second lead on the purple wire terminal on the hi-limit switch. If no voltage across the switch, check for defective hi-limit, open circuit due to excessive water temperature, or a low temperature setting.

6. For JVH only, place the second lead on the blue wire terminal on the fan proving switch. If voltage is present, skip to step 8. If voltage isn’t present, connections or the draft inducer/motor could be defective.

7. Verify the voltage across the roll-out safety switch.

8. If it is determined that there is voltage to the gas valve, the pilot is lit and the pilot sensor is properly positioned, and the thermostat is set high enough to call for heat, the gas valve or the pilot assembly may be defective.

9. See Section 8E for LED fault codes on temperature controller.

Caution

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

Étiquette

de mise en garde tous les fils avant le débranchement lors de l'entretien. Les erreurs de câblage peut causer le mauvais et dangereux.

Vérifier le fonctionnement correct après l'entretien

WARNING

Follow local regulations with respect to installation of carbon monoxide (CO) detectors and manufacturer’s maintenance schedule of the boiler.

AVERTISSEMENT

Conformez-vous aux réglementations locales pour ce qui est de l'installation de détecteur de monoxyde de carbone (CO) et du programme de maintenance du fabricant de la chaudière.

6

7

Mini-Therm JV

#

1

2

3

4

5

8

9

10

11

12

Page 31

Symptom

Pump not operating

Pilot outage

Flame roll-out on start-up

Flame has lazy yellow tip

Not enough heat

Pump noisy

Boiler pounding or knocking

Boiler condensing

Pump cavities or low water pressure at boiler gauge or bubbles in system at high temperature

Pressure relief valve opens

Pilot is lit but main burners will not come on

Boiler short cycles

Cause Remedy

No power . . . . .

Pump defective . . . . .

Incorrectly wired . . . . .

Inlet gas pressure too low . . . . .

Inlet gas pressure to high causing an unstable blowing pilot. . . . .

Damaged pilot. . . .

Pressure should be regulated within limits shown above.

Dirty pilot. . . .

Replace.

Blow dust or lint out of pilot.

Plugged or undersized pilot. . . . Replace pilot orifice.

Blocked outlet

Pilot out of position (delayed ignition) . . . .

Blocked heat exchanger or flue

. . . . .

Check circuit breakers and power source. Replace. Recheck wiring diagrams.

Consult gas utility company. Inlet gas pressure to boiler should be 5.5" (1.4 kPa) to 9.0" (2.2 kPa) water column on natural gas. 10.0" (2.5k Pa) to 14.0" (3.4 kPa) on propane gas.

Check flue damper operation.

Correct pilot position.

Clean and correct as necessary.

Refractory tile out of place . . . . .

Correct or replace tile as necessary.

Low primary air . . . .

Inadequate gas supply . . . . .

Correct manifold pressure according to rating plate. Correct orifice size if necessary (see parts list). Clean burner ports if dirty.

Gas meter too small. Gas line from meter to boiler too small.

Low manifold gas pressure . . . . . Gas pressure on boiler manifold, with Modusnap valve wide open. Should be adjusted to 4.0" (1.0 kPa) W.C. natural gas

9.0" (2.2 kPa) W.C. propane.,

Boiler size inadequate . . . . .

Replace with boiler of higher input.

Air in volute . . . . .

Bleed air from volute. Check pump alignment.

Worn coupling or bearings . . . . .

Replace worn parts.

Too low water flow through boiler

. . . . .

Low water temperature . . . . .

Check temperature rise between inlet and outlet boiler piping. 15°F (8°C) to 25°F (14°C) temperature rise is recommended. If temperature rise is over 25°F (14°C), increase pipe size or pump capacity or locate obstruction.

Check for stuck closed zone valves. Check for zone pumps not operating. Check for closed valve in system.

Flue product moisture will condense at the start-up until the boiler water temperature reaches the normal operating conditions.

Defective fill valves or pressure regulator .

Replace.

Oversized expansion tank . . . . .

Replace.

Expansion tank piped incorrectly

. . . . .

Re-pipe expansion tank to suction size of pump at high temperature.

Waterlogged expansion tank . . . . Drain 2/3 of the water from the expansion tank.

Boiler off on hi-limit control . . . . .

Check for low water flow or hi-limit setting.

Boiler incorrectly wired . . . . .

On single or multiple zone systems with zone valves, room thermostat should be wired to T-T terminals. For multiple zone systems with ozone pumps, thermostats for extra zones should be wired to R&A terminals.

Check continuity through thermostat circuit with Broken wire in thermostat circuit or defective thermostat . . .

Heat anticipator in room thermostat set too low . . . . .

Increase setting (1.0 is usually satisfactory)

Low water flow through boiler . . Increase size of pump or increase piping size.

Hi-limit switch may be set too low . . . .

Increase setting to at least 20°F (11°C) over outlet water temperature.

Page 32 LAARS Heating Systems

START

• TURN GAS SUPPLY OFF

• SET THERMOSTAT TO

CALL FOR HEAT

SV9501/SV9601 IS

POWERED

(24 VAC NOMINAL)

Troubleshooting Honeywell SV9501/SV9601

Hot Surface Pilot System (JVH only)

NO

CHECK:

• LINE VOLTAGE POWER

• LOW VOLTAGE TRANSFORMER

• LIMIT CONTROLLER

• THERMOSTAT

• WIRING

• FAN PROVING SWITCH

ON COMBUSTION AIR BLOWER

YES

NO

UNPLUG IGNITER

MEASURE VOLTAGE AT

TWO BOTTOM TERMINAL OF

SV9501/SV9601

(24 VAC NOMINAL)

IGNITER WARMS UP

AND GLOWS RED

YES

NO

REPLACE

SV9501/

SV9601

PILOT VALVE

OPENS

NO

REPLACE IGNITER

REPLACE SV9501/SV9601

YES

TURN GAS ON.

PILOT BURNER LIGHTS?

YES

MAIN VALVE OPENS?

YES

NO

NO

MEASURE VOLTAGE TO

SV9501/SV9601.

VOLTAGE MUST BE AT LEAST

19.5 VAC.

YES

YES

NO

REPLACE IGNITER

REPLACE IGNITER SENSOR AND

RETAIN: RESTART TROUBLE-SHOOTING

SEQUENCE. DOES MAIN VALVE OPEN?

NO

CHECK

TRANS-FOR -

MER, LINE

VOLT SUP -

PLY

REPLACE

SV9501/

SV9601.

SAVE OLD

IGNIT -

ER-SENSOR

FOR

SERVICE.

SYSTEM OK

NO

DISCARD OLD IGNITER SENSOR

Mini-Therm JV Page 33

SECTION 10. Replacement Parts

10A Glossary of Terms

Air Vent

A device used to purge air from the Circuit. Should be located at the highest point in the Circuit.

Branch

The section(s) of supply and return piping, including the heat distribution units connected directly to the trunk. Also referred to as a “zone”.

By-Pass

A section of pipe (including an adjustable valve) that diverts part of the water flow from undersized piping to the boiler. Adjusted to maintain minimum flow requirement (GPM) through the boiler.

Circuit

Entire water circulation piping, beginning and ending at the boiler (Series Loop System).

Expansion Tank (Compression Tank)

Installed in the circuit to accommodate excess water produced by heat expansion.

Heat Distribution Units

Transfers heat from the water supplied by the boiler to the area to be heated through the use of baseboard, convector, radiator, finned tube. Also known as

“radiation”.

Isolation Valve

Used to isolate the boiler from the circuit. It minimizes the amount of water drained from the system.

Primary-Secondary Piping

Two or more interconnecting circulating loops, each with its own pump. Primary =System Circuit;

Secondary=Boiler Circuit.

Reverse-Return Piping

Balanced, equal flow (first in, last out) piping. Utilized with multiple boilers and/or radiation. Applied with single system pumps, or primary-secondary pump.

System Purge Valve

A device used to purge air from the circuit. Should be located as close as possible to the cold water feed, but not immediately after the cold water feed.

Trunk

The section of piping which connects the boiler return and supply with the branch(es). Also known as a

“main” or “header”. Should be same size as boiler inlet/outlet connections.

Zone Pump

Circulators installed in branch piping that divert hot water coming from the boiler into various areas

(zones) of a building.

Zone Valve

Diverts hot water from the boiler into various areas

(zones) of a building.

Page 34

10B Parts List JVH

Mini-Therm JVH

Description JVH-50

Gas System

1 Pilots

Pilot Assembly (Nat.), Hot Surface

Pilot Assembly (LP), Hot Surface

2 Burner with Pilot Bracket

3 Main Burner

4 Main Gas Valves

Gas Valve, Hot Surface, (Nat.) SV9600H

Gas Valve, Hot Surface, (LP) SV9500H

5 Gas Orifices

(0-2000 FT.) Nat., Orifices

(2001-5000 FT.) Nat., Orifices

(5001-8000 FT.) Nat., Orifices

(8001-10,000 FT.) Nat., Orifices

(0-5000 FT.) LP, Orifices

(5001-8000 FT.) LP, Orifices

(8001-10,000 FT.) LP, Orifices

6 Gas Manifold

Electrical System

7 Controller, Tekra

8 Transformerll5/24V(50VA)

9 Switch, Air Pressure (0-5000 FT.)

Switch, Air Pressure (5001-10000 FT.)

10 Blower/Motor, Induced Draft

11 Switch, Roll-out Safety

12 Switch, Limit

13 Ignition Control

Wire Harness (not shown)

Fuse, 5-Pack, 4-Amp (not shown)

Temp Sensor (not shown)

Outdoor Sensor (not shown)

Water System

14 Heat Exchanger

15 Gauge, Temperature/Pressure

16 Gauge, Temperature

17 Valve, Pressure Relief 30 PSI

18A Well, Immersion, 1/2" NPT

18B Well, Immersion, 3/4" NPT

19 Valve, Drain 1/2' NPT

RW2001800

RW2001900

L0056500

L0052500

R0384700

R0384800

L0032200

L0050700

L0032600

L0050300

L0032900

L0032800

L0032700

L0052601

RE2344300

E2074400

E2074501

E2074504

R2069600

E2103200

R0061300

E2102800

E2347500

RE0084401

E2347600

E2347400

R0402007

A2000400

2400-392

R0061400

E0025902

E2345700

70-270

Jacket and Fire Box Components

20 Base Weldment

21 Front Panel

20400701

11028301

22 Jacket 11027901

23 Cover, top rear

24 Cover, top front

25 Access Panel, heat exchanger plug

26 Cover, piping jacket top

27 Flue Collector Weldment

28 Burner Tray Weldment

29 Control Box Weldment

30 Control Box Cover

31 Burner Cover

32 Tile Cover

33 Heat Exchanger Baffle

34 Front Refractory

35 Rear Refractory

36 Orifice Plates

Orifice Plate, Nat. (0-5000 FT.)

Orifice Plate, Nat. (5001-10,000 FT.)

Orifice Plate, LP (0-5000 FT.)

Orifice Plate, LP (5001-10,000 FT.)

37 Flue Outlet

38 Bracket, pressure switch

11028501

11028401

10535900

11047601

20403901

20403001

20608500

11045901

20403304

10469504

10485307

T2007704

T2007804

20404605

20404605

20404606

20404604

D2004201

11028200

JVH-75 JVH-100

Size

JVH-125

LAARS Heating Systems

JVH-160 JVH-225

R0402008

A2000400

2400-392

R0061400

E0025902

E2345700

70-270

20400702

11028301

11027901

11028502

11028402

10535901

11047602

20403902

20403002

20608500

11045901

20403305

10469505

10485305

T2007705

T2007805

20404607

20404606

20404608

20404606

D2004201

11028200

RW2001800

RW2001900

L0056500

L0052500

R0384700

R0384800

L0032200

L0050700

L0032600

L0050300

L0032900

L0032800

L0032700

L0052602

RW2001800

RW2001900

L0056500

L0052500

R0384700

R0384800

L0032200

L0050700

L0032600

L0050300

L0032900

L0032800

L0032700

L0052603

RW2001800

RW2001900

L0056500

L0052500

R0384700

R0384800

L0032200

L0050700

L0032600

L0050300

L0032900

L0032800

L0032700

L0052604

RE2344300

E2074400

E2074501

E2074504

R2069600

E2103200

R0061300

E2102800

E2347500

RE0084401

E2347600

E2347400

RE2344300

E2074400

E2074501

E2074504

R2069600

E2103200

R0061300

E2102800

E2347500

RE0084401

E2347600

E2347400

RE2344300

E2074400

E2074502

E2074505

R2069600

E2103200

R0061300

E2102800

E2347500

RE0084401

E2347600

E2347400

R0402009

A2000400

2400-392

R0061400

E0025902

E2345700

70-270

20400703

11028303

11027903

11028503

11028403

10535900

11047601

20403903

20403003

20608500

11045901

20403306

10469506

10485306

T2007706

T2007806

20404609

20404608

20404610

20404612

D2004201

11028200

R0402010

A2000400

2400-392

R0061400

E0025902

E2345700

70-270

20400704

11028303

11027903

11028504

11028404

10535901

11047602

20403904

20403004

20608500

11045901

20403304

10469504

10485307

T2007704

T2007804

20404605

20404605

20404606

20404604

D2004201

11028200

R0402011

A2000400

2400-392

R0061400

E0025902

E2345700

70-270

20400705

11028306

11027905

11028505

11028405

10535901

11047602

20403905

20403005

20608500

11045901

20403305

10469505

10485305

T2007705

T2007805

20404607

20404606

20404608

20404606

D2004201

11028200

RW2001800

RW2001900

L0056500

L0052500

R0384700

R0384800

L0050700

L0032600

L0050300

L0050300

L0032900

L0032800

L0032800

L0052605

RW2001800

RW2001900

L0056500

L0052500

RV2001900

R0384800

L0050700

L0032600

L0050300

L0050300

L0032900

L0032800

L0032800

L0052606

RE2344300

E2074400

E2074502

E2074505

R2069600

E2103200

R0061300

E2102800

E2347500

RE0084401

E2347600

E2347400

RE2344300

E2074400

E2074503

E2074506

R2069600

E2103200

R0061300

E2102800

E2347500

RE0084401

E2347600

E2347400

R0402012

A2000400

2400-392

R0061400

E0025902

E2345700

70-270

20400706

11028306

11027906

11028506

11028406

10535901

11047602

20403906

20403006

20608500

11045901

20403306

10469506

10485306

T2007706

T2007806

20404609

20404608

20404610

20404612

D2004201

11028200

Mini-Therm JVi Page 31

24

23

26

25

21

22

13

8

7

12

16

30

11

4

29

15

37

31

10

36

18A

(right side)

5 6

32

33

18B

(left side)

38

34

2

28

3

1

Figure 14A. JVH Parts Identification.

20

ITEMS14, 39

AND INSULATION

NOT SHOWN

17

14

19

27

9

25

32

35

Page 35

Page 36

10C Parts List JVS

Mini-Therm JVS

Description JVS-50

Gas System

1 Pilots

Pilot Assembly (Nat.)

Pilot Assembly (LP)

2 Main Gas Valves

Gas Valve, Natural

Gas Valve, LP

3 Gas Manifold

3 Burner, Main

4 Burner W/Pilot Bracket

Burner/Air Shutter (LP) (not shown) L0055900

Gas Orifices (not shown)

Gas Orifice (Nat.)

Gas Orifice (LP)

R0061600

W0039600

R0385100

V0077500

L0052601

L0052500

L0056500

L0032200

L0032900

Electrical System

5 Controller

6 Transformer 115/24V (40VA)

7 Ignition Control

8 Limit Switch

9 Blocked Vent SafetySwitch

10 Roll-out Safety Switch

Wiring Harness (not shown)

Hi-Tension Lead (not shown)

Fuse, 5-Pack, 4-Amp (not shown)

Temp Sensor (not shown)

Outdoor Sensor (not shown)

RE2344300

R0021300

E2102800

R0061300

R2061100

E2103200

E2347700

10449514

RE0084401

E2347600

E2347400

Water System

11 Heat Exchanger

12 Pressure Relief Valve, 30PSI

13A Well, Immersion, 1/2" NPT

13B Well, Immersion, 3/4" NPT

14 Drain Valve 1/2" NPT (not shown)

R0402001

R0061400

E0025902

E2345700

70-216

Temp/Pressure Gauge (not shown) R0060600

Jacket and Fire Box Components

15 Draft Diverter

16 Rear Panel

17 Jacket

18 Top

19 Cover, Piping, Top

20 Flue Collector

21 Access Panel HX, (L&R)

22 Base, Control Box

23 Cover, Control Box

24 Burner Cover

25 Heat Exchanger Baffle

26 Tile Cover

27 Refractory, Front

28 Refractory, Rear

29 Base Assembly

11020101

11020201

11020301

11020401

11047603

20034901

10535900

20608500

11045901

10500601

10485301

10469501

T0022001

T0021701

10467101

Non-Combustible Base Kit (optional) 10466701

Vent Damper Components

Vent Damper Assembly (not shown) E2071501

Vent Damper Harness (not shown) E0099100

JVS-75

R0061600

W0039600

R0385100

V0077500

L0052602

L0052500

L0056500

L0055900

L0032200

L0032900

RE2344300

R0021300

E2102800

R0061300

R2061100

E2103200

E2347700

10449514

RE0084401

E2347600

E2347400

E2071502

E0099100

R0402002

R0061400

E0025902

E2345700

70-216

R0060600

11020102

11020201

11020301

11020401

11047604

20034902

10535900

20608500

11045901

10500601

10485308

10469502

T0022002

T0021702

10467102

10466701

JVS-100

Size

JVS-125

LAARS Heating Systems

JVS-160 JVS-225

R0402003

R0061400

E0025902

E2345700

70-216

R0060600

11020103

11020203

11020303

11020403

11047603

20034903

10535900

11045700

11045800

10500602

10485309

10469503

T0022003

T0021703

10467103

10466702

E2071502

E0099100

R0061600

W0039600

R0407700

V0079100

L0052603

L0052500

L0056500

L0055900

L0032200

L0032900

R0061600

W0039600

R0407700

V0079100

L0052604

L0052500

L0056500

L0055900

L0032200

L0032900

R0061600

W0039600

R0407700

V0079100

L0052603

L0052500

L0056500

L0055900

L0032200

L0032900

R0061600

W0039600

R0407700

V0079100

L0052604

L0052500

L0056500

L0055900

L0032200

L0032900

RE2344300

R0021300

E2102800

R0061300

R2061100

E2103200

E2347700

10449514

RE0084401

E2347600

E2347400

RE2344300

R0021300

E2102800

R0061300

R2061100

E2103200

E2347700

10449514

RE0084401

E2347600

E2347400

RE2344300

R0021300

E2102800

R0061300

R2061100

E2103200

E2347700

10449515

RE0084401

E2347600

E2347400

RE2344300

R0021300

E2102800

R0061300

R2061100

E2103200

E2347700

10449516

RE0084401

E2347600

E2347400

R0402004

R0061400

E0025902

E2345700

70-216

R0060600

11020104

11020203

11020303

11020404

11047604

20034904

10535900

11045700

11045800

10500602

10485311

10469504

T0022004

T0021704

10467104

10466702

E2071503

E0099101

R0402005

R0061400

E0025902

E2345700

70-216

R0060600

11020105

11020205

11020305

11020405

11047604

20034905

10535900

11045700

11045800

10494105

10485310

10469505

T0022605

T0021705

10467105

10466703

E2071503

E0099101

R0402006

R0061400

E0025902

E2345700

70-216

R0060600

11020106

11020206

11020306

11020406

11047606

20034906

10535900

11045700

11045800

10494106

10485306

10469506

T0022606

T0021706

10467106

10466704

E2071504

E0099101

Mini-Therm JVS

19

18

9

24

5

22

23

8

7

17

20

6

13B

(on left side)

13A

26

2

12

25

27 29

4

3

1

Figure 14B. JVS Parts Identification.

14

11

15

16

21

26

28

Page 37

Page 38 LAARS Heating Systems

800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors)

20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 (Applications Engineering)

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 1208 Document 1254