Mini-TherM - Columbia Heating

Mini-TherM - Columbia Heating
Installation and Operation Instructions
Document 1254
Installation and
Operation Instructions for
Mini-Therm
Residential
Gas-Fired
Hydronic Boilers
Models JVH, JVS
JVS
JVH
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
H2355800-
• 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
LAARS Heating Systems
TABLE OF CONTENTS
SECTION 1.
General Information
1A.
1B.
1C. Introduction.....................................................3
Warranty.........................................................3
Heater Identification........................................4
SECTION 2.
Boiler Assembly & Placement
2A.
2B.
2C.
2D.
2E.
Field Assembly...............................................4
Boiler Placement............................................5
Flooring...........................................................5
Dimensional Information................................. 6
Clearance / Closet Installations...................... 8
SECTION 3.
Air and Venting
3A.
3B.
3C.
3D-1
3D-2
3D-3
3E.
Combustion Air Supply................................... 9
Venting..........................................................10
Vertical Venting - Category I......................... 11
Horizontal Venting - Category III................... 12
Venting Connections.....................................12
Vent Terminations.........................................13
Common Venting System............................. 13
SECTION 4.
Gas Connections
4A.
4B.
Gas Supply and Piping................................. 13
Special Precautions for LP .......................... 15
SECTION 5.
Water Connections
5A.
5B.
5C.
5D.
5E.
5F.
5G.
5H.
Water Piping.................................................15
By-pass Piping..............................................17
Adjusting the bypass.................................... 17
Alternate Auto-Bypass Operation................. 17
Flow Requirements.......................................18
Chilled Water Systems.................................18
Oxygen Permeable Systems........................ 18
Anti-Freeze...................................................18
SECTION 6.
6A.
6B.
Electrical Wiring............................................20
Outdoor Reset..............................................20
SECTION 7.
7A.
Filling the System.........................................23
SECTION 8.
Operating Procedures
8A.
8B.
8C.
8D.
8E.
System Start-up............................................23
Sequence of Operation................................. 23
Operating Instructions, JVH.......................... 25
Operating Instructions, JVS.......................... 26
Operating Temperature Control.................... 27
SECTION 9.
9A.
9B.
Maintenance.................................................28
Electrical Troubleshooting............................ 29
SECTION 10. Replacement Parts
10A.
10B.
10C.
Glossary of Terms.........................................32
Parts List JVH...............................................34
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
MODEL
J
V
3
IGNIT
SYST
S
H
4
5
6
SIZE
0
0
1
1
1
2
5
7
0
2
6
2
7
FUEL
0
5
0
5
0
5
N
P
8
9
FIRING
SYST
CONST
OPTION
C
D
K
S
P
I
J
10
11
12
U
2
ALTITUDE
COUNTRY
REVISION
S
H
I
J
U
2
Table 1. Boiler Model Identification.
JVH
JVS
1st and 2nd Characters (Series Name)
JV = Mini-Therm
3rd Character (Ignition System)
S = Spark Ignition
H = Hot Surface Pilot
4th thru 6th Characters (Size)
Input MBTU / H
7th Character (fuel)
N = Natural Gas
P = Propane Gas
8th Character (Firing System)
C = On / Off
9th Character (Construction Option)
S = Standard
10th Character (Altitude in Feet)
S = (0 - 2,000) Natural or (0 - 5,000) Propane
H = (2,001 - 5,000) Natural
I = (5,001 - 8,000) Natural and Propane
J = (8,001 - 10,000 Natural and Propane
11th Character (Country)
U = USA & Canada
12th Character (Revision)
2 = Second Revision
1st and 2nd Characters (Series Name)
JV = Mini-Therm
3rd Character (Ignition System)
S = Spark Ignition
H = Hot Surface Pilot
4th thru 6th Characters (Size)
Input MBTU / H
7th Character (fuel)
N = Natural Gas
P = Propane Gas
8th Character (Firing System)
d = on / off (JVS 050-75)
K = two-stage (JVS 100-225)
9th Character (Construction Option)
I = (Standard)
J = Pump (050-125 only)
10th Character (Altitude in Feet)
S = (0 - 2,000) Natural or (0 - 5,000) Propane
H = (2,001 - 5,000) Natural
I = (5,001 - 8,000) Natural and Propane
J = (8,001 - 10,000 Natural and Propane
11th Character (Country)
U = USA & Canada
12th Character (Revision)
2 = Second Revision
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.
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.
2B. Boiler Placement
1. T
he 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
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
LAARS Heating Systems
2D. JVH Dimensional Information
Dimensions in inches
mm
C
B
7
180
6
152
2.4
61
25
635
24
610
Size
50
75
100
125
160
225
A
B
in.
mm
in.
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
C
mm
in.
79 2-7/8
2
57
146 2-7/8
2
140
2
184
2
254
Water
Gas
mm Connection Connection
73
51
73
51
51
51
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
JVH Dimensions
7
180
9 -1/4
240
Mini-Therm JV
JVS
Page 7
2D. JVS Dimensional Information
24
610
Dimensions in inches
mm
7
180
Size
A
B
C
D
E
V
9 -1/4
240
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
1-1/4
1/2
100
16-7/8
430
28-3/4
730
24-1/8
610
22-3/4
580
27-1/2
700
5
13
1-1/4
1/2
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
1/2
160
20-3/8
518
28-3/4
730
23-5/8
600
22-3/4
580
27-1/2
700
6
15
1-1/4
1/2
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
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
Boiler Sizes
50
-
225
Clearances
in
cm
Left side
2
5
Right side
5
15
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
50
-
125
160
-
225
Clearances
in
cm
in
cm
Left side
6
15
6
15
Right side
6
15
6
15
Rear
2
5
Rear
6
15
6
15
Front
4
10
Front
4
10
4
10
Flue (using B-vent)
6
15
Flue
6
15
6
15
Top
23
58
Top
23
58
36
91
Table 2JVH Minimum Boiler Clearances
Table 2JVS Minimum Boiler Clearances
Note: C
learances 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
2
(51)
A
2
(51)
6 15
TOP
VIEW
6 15
4*
10
5
(127)
6
(152)
Air
Openings
6
(152)
MIN
6 15
B
SIDE
VIEW
*6" for models JV160 to JV225.
Figure 1JVS Closet Installation
Dimensions in
inches (mm).
Figure 1JVH. Closet Installation.
Dimensions in inches cm.
Mini-Therm JV
Page 9
Section 3.
Air and Venting
Boiler Size
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).
CHIMNEY
LINER
THIMBLE
Figure 2. Chimney Venting.
Inside Air Area
sq. in.
sq. cm
100
645
100
645
100
645
125
807
160
1032
225
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
1/4"
PER FT.
(20mm PER M)
SLOPE
VENT
SYSTEM
CLEANOUT
50
75
100
125
160
225
Outside Air Area
sq. in
sq. cm
15
97
20
129
25
161
32
206
40
258
60
387
BOILER
LINER
1/4"
PER FT.
(20mm PER M)
SLOPE
THIMBLE
CLEANOUT
Figure 3. Vertical Venting.
VENT
SYSTEM
12" (305mm)
BOILER
Page 10
LAARS Heating Systems
10 (3.0) OR
LESS
2 (0.6) MIN.
WALL OR
PARAPET
CHIMNEY
10 (3.0)
OR LESS
2 (0.6)
MIN.
RIDGE
CHIMNEY
MORE THAN 10
(3.0)
3 (0.9)
MIN.
3 (0.9)
MIN.
TERMINATION
10 FT. (3.0m)
OR LESS FROM RIDGE,
WALL OR PARAPET
3 (0.9)
MIN.
WALL OR
PARAPET
NOTE: NO HEIGHT
ABOVE PARAPET
REQUIRED WHEN
FROM WALLS OR
PARAPET IS MORE
THAN 10 FT. (3.0m)
Dimensions in feet (m).
CHIMNEY
MORE THAN 10
(3.0)
10 (3.0)
RIDGE
2 (0.6)
MIN.
3 (0.9)
MIN.
CHIMNEY
Figure 4. Vertical Vent Termination.
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
Page 11
of the pipe, which may cause excessive cooling and
condensation.
3.
3C.Vertical Venting - Category I
(JVS and JVH)
4.
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.
If a chimney rebuild is required, it shall conform
to nationally recognized standards (see National
Building Code or ANSI/NFPA 211).
The boiler must not be connected to a fireplace,
wood stove or other solid fuel burning
equipment.
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.
5.
IMPORTANT NOTE: Always provide a minimum
clearance of 6” (152mm) between Type C (single wall)
vent pipe and any combustible materials.
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.
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!
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.
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.
SEAL ENTIRE
CIRCUMFERENCE
OF JOINT
VENT TERMINAL
CAULK JOINTS
ANCHORED
FASTENER
VENT TERMINAL
3 (0.9)
MIN.
4 (1.2)
MIN.
VENT
TERMINAL
4 (1.2)
MIN.
Figure 6. Horizontal Vent Termination.
ANCHORED
FASTENER
LESS THAN
10
(3.0)
EXHAUST
HOOD
6 (1.8) MIN.
12 (3.7)
MIN.
Dimensions in
feet (m).
CAULK JOINTS
A
DE
GR
FORCED
AIR INLET
THIMBLE
SHEET METAL
SCREWS
VENT TERMINAL DETAIL
Page 12
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. H
orizontal 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
VENT TERMINAL
HOOD
*
12" (305mm)
MIN.
CAULK ENTIRE
JOINT, INCLUDING
THE SCREWS
*WHEN HORIZONTAL RUN
EXCEEDS 5 FT. (1.5m)
Figure 5. Horizontal Venting.
LAARS Heating Systems
For best results, horizontal vent systems should
be as short and straight as possible. Material of vent
connectors shall be as follows:
Description
Manufacturer
Product
High Temperature
RTV
Dow Corning
Trade Mate
2" (51mm) wide
Aluminum foil tape
- adhesively backed
Venture
Product
#3243
2" (51mm) wide
Aluminum foil tape
- adhesively backed
3M
Product #433
Vent Sealing Materials.
Materials
Vent Length
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.
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.
2.
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.
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).
Support the vent run at 3’ (.9m) intervals with
overhead hangers.
Diameter
Size
50 - 160
225
225
in.
mm
No. of
Elbows
4
4
6
102
102
152
4
2
4
Horizontal Run Length
ft.
m
35
10
35
10.7
3.0
10.7
For each elbow eliminated, add 5’ (1.5m) of allowable vent.
Table 6. Horizontal Venting Configuration.
3.
4.
Pitch down the vent run, toward the vent terminal
(hood), 1/4” per foot (20mm per meter).
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
Page 13
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.
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.
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.
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.
2.
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.
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
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.
75
100
125
160
1/2
3/4
3/4
(1.3 kPa)
LP Gas
(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
Gas Supply
Inlet
To Equipment
Inlet
Tee
Fitting
Nipple
225
Cap
Pipe Size
0-50
0-15m
3 in.
(76mm) Min.
Boiler Size
50
Minimum
Maximum
5.5 Inches WC 10.5 Inches WC
Table 7. Natural Gas Pipe Size Requirements*
Attention
Vous endommagerez la soupape de gaz
si vous ne respectez pas les procédures
suivantes.
Distance
From Gas
Meter
Supply Pressure
Natural Gas
*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 maintain a 1/2" minimum diameter. A 'normal' number of Tees and
elbows have been taken into allowance.
Caution
Permanent damage to the gas valve will occur
if the following procedures are not followed.
3.
LAARS Heating Systems
Figure 7. Typical design for a sediment trap/drip leg.
3/4
1
1
TO BOILER
DROP
HORIZONTAL
RISER
TO BOILER
3" (76mm)
MIN.
SEDIMENT TRAP
OR DRIP LEG
Figure 8. Gas Supply Piping.
3" (76mm)
MIN.
SEDIMENT TRAP
OR DRIP LEG
Mini-Therm JV
4.
5.
6.
7.
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.
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.
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.
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
JV
Single Circuit System
Multi-Zone
Pump
System
LAARS Heating Systems
Multi-Zone
Valve System
Primary
Secondary
Multi-Zone
Pump System
JV
JV
PUMP
JV
JV
Primary/Secondary Multi-Zone Valve System
Low Temperature Installation
KEY:
JV
CHECK VALVE
Figure 9. Typical Plumbing Installations.
VALVE
Primary/Secondary Multi-Zone Valve System
ZONE VALVE
UNION
AUTO AIR BLEEDER
Mini-Therm JV
15°F 8°C
Page 17
Size
50
75
Flow Rate
20°F 11°C
Headloss
gpm
l/s
ft
5.3
0.3
0.3
Flow Rate
gpm
m
l/s
0.14 0.3
25°F 14°C
Headloss
Flow Rate
Headloss
ft
m
gpm
l/s
ft
m
0.2
0.1
3.2
0.2
0.1
0
8
0.5
0.6
0.2
6
0.4
0.3
0.1
4.8
0.3
0.2
0.1
100
10.7
0.7
1.3
0.4
8
0.5
0.7
0.2
6.4
0.4
0.5
0.2
125
13.3
0.8
2.2
0.710 0.6
1.3
0.4
8
0.5
0.8
0.2
160
17
1.1
2.5
0.8
12.8
0.8
1.8
0.5
10.2
0.6
1.2
0.4
225
24
1.55 1.5
18
1.1
3.1
0.9
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
single zone systems. Consult the factory or a qualified
system designer if you have more fittings or different
size or type of pipe.
To
System
From
System
LAARS Heating Systems
Balancing
Valve
Balancing Valve
or optional thermostatic union, Laars P/N
2400-030. (Primary/
Secondary only)
1/2" Pipe
Size Pump
H.P.
100
125
160
Out
(Supply)
225
Drip
Leg
Left Side View
A full size by-pass must be installed.
1" Pipe
1-1/4" Pipe
Pump
H.P.
Pump
H.P.
Pump
H.P.
1/25 1/12 1/251/12 1/6 1/25 1/12 1/6 1/25 1/12 1/6
99 390 680 *** * ***
* 35 160 300 460 640 * * ***
** 77 150 260 330 620 * ***
** 27 80 140 170 360 600 ***
** * 25 72 57 160 330 190 480 *
** ** ***110* 69 330
50 50
75
In
(Return)
3/4" Pipe
*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 HP=B&G LR12, Grundfos UP26-42F, or equivalent. 1/6 HP=B&G series HV,
Grundfos UP43-75, or equivalent.
Table 10. Maximum Suggested Circuit Length in Feet.
Figure 10. By-pass Piping.
5F Chilled Water Systems
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
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.
5HAnti-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.
LOW TEMP SYSTEMS
Pump
Tempering
Valve
Isolation Valve
To
System
To
System
Isolation
Valve
Pump
JV
Tempering
Valve
From
System
Pump Isolation
Valve
Primary/Secondary
System Loop with Tempering Valve and Pump with Boiler Loop
with Tempering Valve and Pump
From
System
Pump Isolation
Valve
Primary/Secondary Piping with Automatic By-Pass
Balancing
Valve
Isolation Valve
To
System
Pump
Balancing
Valve
To
System
Balancing
Valve
Balancing
Valve
Pump Isolation
Valve
From
System
Primary/Secondary Piping with Field Balancing
(for Fixed Low Return Temperatures)
To
System
Isolation
Valve
Pump
JV
Variable Speed
Control
JV
Auto
By-Pass
Valve
From
System
Pump Isolation
Valve
Primary/Secondary Piping with By-Pass
(for Fixed Low Return Temperatures)
Laars
Thermostatic
Union
PN 2400-030
Isolation Valve
To
System
Pump
JV
Isolation
Valve
Pump
JV
Balancing
Valve
JV
120°+
Pump Isolation
Valve
From
System
Primary/Secondary Piping with Variable Speed Injection
From
System
Pump Isolation
Valve
Primary/Secondary Piping with Laars
Thermostatic Union as an Automatic Bypass
NON-LOW TEMPERATURE SYSTEMS
(120°F+ Return Temps)
Tempering
Valve
To
System
Isolation
Valve
Isolation Valve
To
System
Pump
Pump
JV
From
System
Pump Isolation
Valve
Tempering Valve with System Loop
and Boiler Loop Pump
JV
Pump
From
System
Isolation
Valve
Simple Primary/Secondary Piping - Hydronic - Not Low Temp
Figure 11. Typical Plumbing Diagrams.
NOTE: All closed loop systems should include air elimination, expansion tank and feed water inlet. Place at point of lowest pressure (typically
at the inlet of pump).
NOTE: All closed
loop systems should include air elimination, expansion tank and feed water inlet. Place at point of lowest
NOTE: Ball valves should not be used as balancing valves. Only use for shutoff apps.
pressure (typically at the inlet of pump).
NOTE: Ball valves should not be used as balancing valves. Only use for shutoff apps.
Page 20
LAARS Heating Systems
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.
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.
A
B
C
D
4
BK
BK-NOIR
W-BLANC
R-ROUGE
Y-JAUNE
BL-BLEU
BR-BRUN
O-ORANGE
P-MAUVE
G-VERT
Y
4
HI
FAN
FLAME
LIMIT PROVING ROLL
OUT
O
BK-BLACK
W-WHITE
R-RED
Y-YELLOW
BL-BLUE
BR-BROWN
O-ORANGE
P-PURPLE
G-GREEN
THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE
PROPRIETARY TO LAARS HEATING SYSTEMS CO.AND SHALL NOT BE
REPRODUCED, TRANSFERRED TO OTHER DOCUMENTS, USED OR
DISCLOSED TO OTHERS FOR MANUFACTURING OR ANY OTHER
PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED IN WRITING
BY LAARS HEATING SYSTEMS CO.
P
PILOT
HSI
1
2
2.0
CURVE
DHW CALL
WWSD
INDUCER FAN
SWITCHED 120 VAC TO PUMP
120 VAC L
HEAT CALL
HEAT CALL
POWER
FIELD
WIRING
0.4
3.6
UNLESS OTHERWISE SPECIFIED:
TOLERANCES ARE:
DECIMALS .X .1 FRACTIONS 1/8"
DECIMALS .XX .03
DECIMALS .XXX .010
ANGLES 1
BR
BOX
DIVIDER
W
Y
COM CALL
DHW CALL
OUT
COM
SYS
OFF ON
BOILER
SENSOR
3
4
BK
R
TRANSFORMER
24V
115V
(220V OPT)
3
N/A
FINISH
N/A
MATERIAL: JVH
Figure 10A. Wiring Diagram,
BL
BK
R
Y
FUSE
GAS VALVE/
3 1 CONTROLLER
4 2 SV9501, SV9601
R
BOILER
SENSOR
BL
R
R
NOTE:
1. 4-PIN MOLEX AS VIEWED FROM REAR OF BOARD.
3
FAN
W
W
2
APPR
ENGR
DRAFT
ECN
12-032N-01
ENGR APPR
CJ 5-23-12
B
S
SOFTWARE DWG. NO:
1
SHEET 1 OF 1
E23446
WIRE DIAGRAM JVH
HOT SURFACE IGN. NAT/LP
SCALE: NONE
INTENDED SIZE:
TITLE:
LA CHAUDIÈRE NE FONCTIONNERA
PAS SANS LE VOLET MOTORISÉ
AUTOMATIQUE. LE F AISCEAU DE
CÂBLES DU VOLET MOTORISÉ DOIT
ÊTRE INSÉRÉ DANS LA PRISE DU
VOLET MOTORISÉ
AU CANADA: CERTAINS APPAREILS
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
IN CANADA: SOME UNITS ARE
SUPPLIED WITH VENT DAMPER
JUMPER PLUG. DO NOT REMOVE
JUMPER UNLESS VENT DAMPER
IS TO BE INSTALLED.
THE BOILER WILL NOT OPERA TE
WITHOUT THE AUTOMA TIC VENT
DAMPER. THE VENT DAMPER WIRE
HARNESS MUST BE INSERTED INTO
THE VENT DAMPER RECEPTACLE.
GROUNDING
CONDUCTOR
CABLE DE MISE
A LA TERRE
NEUTRAL
NEUTRE
Boiler
Pump 5A Max
(Field Supplied)
Pompe À Chaleur
(Fourni Lors De
L'Installation)
PM 9-20-11
CHECK
1
HOT CHAUD
115/60HZ (220V50Hz OPTIONAL)
POWER SUPPLY
MOUNTED 4-PIN MOLEX
INDUCED DRAFT
MODEL JVH
APPROVALS
DRAFT
PM 5-23-12
REVISIONS
CHANGE: ADDED NOTES AND UPDATED WIRES TO BOARD
A
REV.
DO NOT SCALE DRAWING.
THIRD ANGLE PROJECTION.
DIMENSIONS ARE IN INCHES.
2
REV.
A
APPR
Mini-Therm JV
Page 21
B
C
D
R
Y
P
PV
C
MV
BK
O
Y
BR
Gas Valve
HW VR8304
BK
Blocked
Vent
Safety
Switch
BK
(2-STAGE ONLY)
BK
Roll-Out
Switch
Limiteur
De Retour
De Falmme
Power Venter Receptacle
See Doc. 1077
Prise De Ventilation
À Air Pulsé (Voir Manuel)
Y
High Limit
Limite
Supérieure
9 SPARK
8 MV
7 TH-W
6 24V
5 24 V (GR)
4 GND
3 PV
2 MV/PV
1 MV
TEMPERATURE
SENSOR
SPARK
BL
BK
R
2
4
BK
Y
Y
Y
Y
R
CURVE
DHW CALL
WWSD
Pilot Burner
with Spark
Electrode Sensor
Veilleuse À
Capteur
D'Électrode À Étincelles
INDUCER FAN
SWITCHED 120 VAC TO PUMP
120 VAC L
HEAT CALL
HEAT CALL
POWER
FIELD
WIRING
0.4
2.0
COM CALL
DHW CALL
OUT
COM
SYS
OFF ON
BOILER
SENSOR
1
3
3.6
NOTE:
1. 4-PIN MOLEX AS VIEWED
FROM REAR OF BOARD.
W
W
Boiler Pump 5A Max
(Field Supplied)
Pompe À Chaleur
(Fourni Lors De L'Installation)
LA CHAUDIÈRE NE FONCTIONNERA
PAS SANS LE VOLET MOTORISÉ
AUTOMATIQUE. LE F AISCEAU DE
CÂBLES DU VOLET MOTORISÉ DOIT
ÊTRE INSÉRÉ DANS LA PRISE DU
VOLET MOTORISÉ
AU CANADA: CERTAINS APPAREILS
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
IN CANADA: SOME UNITS ARE
SUPPLIED WITH VENT DAMPER
JUMPER PLUG. DO NOT REMOVE
JUMPER UNLESS VENT DAMPER
IS TO BE INSTALLED.
THE BOILER WILL NOT OPERATE
WITHOUT THE AUTOMA TIC VENT
DAMPER. THE VENT DAMPER WIRE
HARNESS MUST BE INSERTED INTO
THE VENT DAMPER RECEPTACLE.
GROUNDING
CONDUCTOR
CABLE DE MISE
A LA TERRE
NEUTRAL
NEUTRE
HOT CHAUD
115/60Hz (220V/50Hz OPTIONAL)
POWER SUPPLY
DO NOT SCALE DRAWING.
BK-NOIR
W-BLANC
R-ROUGE
Y-JAUNE
BL-BLEU
BR-BRUN
O-ORANGE
P-MAUVE
G-VERT
UNLESS OTHERWISE SPECIFIED:
TOLERANCES ARE:
BK-BLACK
W-WHITE
R-RED
Y-YELLOW
BL-BLUE
BR-BROWN
O-ORANGE
P-PURPLE
G-GREEN
BOX
DIVIDER
Figure 10B. Wiring Diagram, JVS
REMOTE FLAME SENSOR
IGNITION
CONTROL
BL
R
(2-STAGE ONLY)
FUSE
Soupape De Gaz
HW VR8304
H
JUMPER
CAVALIER
R
R
Vent Damper Receptacle
Prise Du Faisceau De
Câbles De Volet Motorisé
R
1234
TRANSFORMER
24V
115V
(220V OPT)
BK
Page 22
LAARS Heating Systems
Mini-Therm JV
Page 23
JVH
110 VAC
R
JVS
N
TEMP CONTROL
CONTROL
RLY
CONTROL
RLY
BK
BL
BOILER
PUMP
BR
INDUCER
FAN
N
110 VAC
TEMP
CONTROL
PUMP
5A MAX
R
BK
TRANSFORMER
110V
TRANSFORMER
BK
R
R
GND
GND
24V
FUSE
2A
TEMP CONTROL
FUSE
R
4
2
GAS VALVE
1
TEMP CONTROL
R
4
2
DAMPER
TEMP
CONTROL
HI LIMIT
BL
3
1
TEMP
CONTROL
1
P
HI LIMIT
FAN
PROVING
ROLLOUT
SW
GAS
VALVE
POWER VENTER
BK
4
BLOCKED
VENT
BK
ROLLOUT
SW
BK
IGNITION CONTROL
6
Figure 12A. JVH Ladder Diagram
MV
C
PV
5
BR
GAS VALVE
Y
MV
O
MV/PV
PV
TEMP CONTROL
3
BK
H
2nd STAGE ONLY
Figure 12B. JVS Ladder Diagram
JVH PILOT
1.25
(32)
JVS PILOT
0.16
(4)
MAIN BURNER
FLAME PATTERN
Figure 13. Main Burner/Pilot Flame Pattern.
0.10 TO 0.35
(3 to 9)
MINIMUM FLAME
LENGTH
MINIMUM FLAME
LENGTH
0.50
(13)
1.25
(32)
Dimensions in
inches (mm).
0.50
(13)
Page 24
LAARS Heating Systems
COM
HEAT
Wiring
with Taco
Zone Valves
COM
HEAT
Wiring with
Honeywell
Zone Valves
COM
HEAT
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.
2.
3.
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.
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.
The pilot and main burners will automatically
ignite when there is a call for heat.
8B. Sequence of Operation
1.
2.
3.
4.
5.
6.
7.
Wall thermostat will call for heat.
Pump relay will turn on the circulating pump.
If water temperature is below the limit setting,
the inducer motor relay will turn on the draft
inducer (JVH).
Pressure switch will sense the fan (JVH only)
operation and send 24 volts to the flame rollout
switch.
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.
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.
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
Page 28
8.E Operating Temperature Control
LAARS Heating Systems
3. Boiler target = 70 deg F + RR X
Outdoor
Temp F
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.
(70 deg F - outdoor temp)
Heating Curve=Reset Ratio (RR)=
1.0
2.0
3.0
Boiler Target F
170
160
210
150
210
140
130
190
170
150
190
160
130
130
130
-30
-20
-10
0
10
20
30
40
50
60
70
WWSD OFF
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
14, 39
maintain a maximumITEMS
water
temperature. The Boiler
AND INSULATION
Maximum water temperature
is set by setting dip
NOT SHOWN
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.
2.
3.
4.
Lubricate the water circulating pump per the
instructions on the pump.
If a strainer is employed in a pressure reducing
valve or the piping, clean it every six months.
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.
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
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.
LAARS Heating Systems
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.
ee Section 8E for LED fault codes on
S
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
9B. Electrical Troubleshooting
1.
2.
3.
4.
Remove the control box cover on the front of the
boiler.
Verify that 115 volts is reaching the boiler by
testing across the black wire and the white wire
on the transformer.
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.
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
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.
Mini-Therm JV
Page 31
#
Symptom
Cause
Remedy
1
Pump not operating
No power . . . . .
Pump defective . . . . .
Incorrectly wired . . . . .
Check circuit breakers and power source. Replace. Recheck
wiring diagrams.
2
Pilot outage
Inlet gas pressure too low . . . . .
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.
Inlet gas pressure to high
causing an unstable blowing
pilot. . . . .
Pressure should be regulated within limits shown above.
Damaged pilot. . . .
Replace.
Dirty pilot. . . .
Blow dust or lint out of pilot.
Plugged or undersized pilot. . . .
Replace pilot orifice.
Blocked outlet
Check flue damper operation.
Pilot out of position (delayed
ignition) . . . .
Correct pilot position.
Blocked heat exchanger or flue
.....
Clean and correct as necessary.
3
Flame roll-out on start-up
Refractory tile out of place . . . . .
Correct or replace tile as necessary.
4
Flame has lazy yellow tip
Low primary air . . . .
Correct manifold pressure according to rating plate. Correct
orifice size if necessary (see parts list). Clean burner ports
if dirty.
5
Not enough heat
Inadequate gas supply . . . . .
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.
6
Pump noisy
7
Boiler pounding or knocking
Too low water flow through boiler
.....
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.
8
Boiler condensing
Low water temperature . . . . .
Flue product moisture will condense at the start-up until
the boiler water temperature reaches the normal operating
conditions.
9
Pump cavities or low water
pressure at boiler gauge or
bubbles in system at high
temperature
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.
10
Pressure relief valve opens
Waterlogged expansion tank . . . .
Drain 2/3 of the water from the expansion
tank.
11
Pilot is lit but main burners
will not come on
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.
Broken wire in thermostat circuit
or defective thermostat . . .
Check continuity through thermostat circuit with
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.
12
Boiler short cycles
Page 32
LAARS Heating Systems
Troubleshooting Honeywell SV9501/SV9601
Hot Surface Pilot System (JVH only)
START
• TURN GAS SUPPLY OFF
• SET THERMOSTAT TO
CALL FOR HEAT
SV9501/SV9601 IS
POWERED
(24 VAC NOMINAL)
NO
YES
IGNITER WARMS UP
AND GLOWS RED
PILOT VALVE
OPENS
NO
CHECK:
• LINE VOLTAGE POWER
• LOW VOLTAGE TRANSFORMER
• LIMIT CONTROLLER
• THERMOSTAT
• WIRING
• FAN PROVING SWITCH
ON COMBUSTION AIR BLOWER
UNPLUG IGNITER
MEASURE VOLTAGE AT
TWO BOTTOM TERMINAL OF
SV9501/SV9601
(24 VAC NOMINAL)
NO
REPLACE
SV9501/
SV9601
NO
CHECK
TRANS-FORMER, LINE
VOLT SUPPLY
YES
REPLACE IGNITER
NO
REPLACE SV9501/SV9601
YES
TURN GAS ON.
PILOT BURNER LIGHTS?
NO
MEASURE VOLTAGE TO
SV9501/SV9601.
VOLTAGE MUST BE AT LEAST
19.5 VAC.
YES
YES
REPLACE IGNITER
MAIN VALVE OPENS?
NO
YES
SYSTEM OK
REPLACE IGNITER SENSOR AND
RETAIN: RESTART TROUBLE-SHOOTING
SEQUENCE. DOES MAIN VALVE OPEN?
YES
NO
DISCARD OLD IGNITER SENSOR
NO
REPLACE
SV9501/
SV9601.
SAVE OLD
IGNITER-SENSOR
FOR
SERVICE.
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
LAARS Heating Systems
10B Parts List JVH
Mini-Therm JVH
Description
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)
14
15
16
17
18A
18B
19
Water System
Heat Exchanger
Gauge, Temperature/Pressure
Gauge, Temperature
Valve, Pressure Relief 30 PSI
Well, Immersion, 1/2" NPT
Well, Immersion, 3/4" NPT
Valve, Drain 1/2' NPT
Jacket and Fire Box Components
Base Weldment
Front Panel
Jacket
Cover, top rear
Cover, top front
Access Panel, heat exchanger plug
Cover, piping jacket top
Flue Collector Weldment
Burner Tray Weldment
Control Box Weldment
Control Box Cover
Burner Cover
Tile Cover
Heat Exchanger Baffle
Front Refractory
Rear Refractory
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
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
JVH-50
JVH-75
JVH-100
RW2001800
RW2001900
L0056500
L0052500
RW2001800
RW2001900
L0056500
L0052500
RW2001800
RW2001900
L0056500
L0052500
R0384700
R0384800
R0384700
R0384800
L0032200
L0050700
L0032600
L0050300
L0032900
L0032800
L0032700
L0052601
Size
JVH-125
JVH-160
JVH-225
RW2001800
RW2001900
L0056500
L0052500
RW2001800
RW2001900
L0056500
L0052500
RW2001800
RW2001900
L0056500
L0052500
R0384700
R0384800
R0384700
R0384800
R0384700
R0384800
RV2001900
R0384800
L0032200
L0050700
L0032600
L0050300
L0032900
L0032800
L0032700
L0052602
L0032200
L0050700
L0032600
L0050300
L0032900
L0032800
L0032700
L0052603
L0032200
L0050700
L0032600
L0050300
L0032900
L0032800
L0032700
L0052604
L0050700
L0032600
L0050300
L0050300
L0032900
L0032800
L0032800
L0052605
L0050700
L0032600
L0050300
L0050300
L0032900
L0032800
L0032800
L0052606
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
E2074501
E2074504
R2069600
E2103200
R0061300
E2102800
E2347500
RE0084401
E2347600
E2347400
RE2344300
E2074400
E2074502
E2074505
R2069600
E2103200
R0061300
E2102800
E2347500
RE0084401
E2347600
E2347400
RE2344300
E2074400
E2074502
E2074505
R2069600
E2103200
R0061300
E2102800
E2347500
RE0084401
E2347600
E2347400
RE2344300
E2074400
E2074503
E2074506
R2069600
E2103200
R0061300
E2102800
E2347500
RE0084401
E2347600
E2347400
R0402007
A2000400
2400-392
R0061400
E0025902
E2345700
70-270
R0402008
A2000400
2400-392
R0061400
E0025902
E2345700
70-270
R0402009
A2000400
2400-392
R0061400
E0025902
E2345700
70-270
R0402010
A2000400
2400-392
R0061400
E0025902
E2345700
70-270
R0402011
A2000400
2400-392
R0061400
E0025902
E2345700
70-270
R0402012
A2000400
2400-392
R0061400
E0025902
E2345700
70-270
20400701
11028301
11027901
11028501
11028401
10535900
11047601
20403901
20403001
20608500
11045901
20403304
10469504
10485307
T2007704
T2007804
20400702
11028301
11027901
11028502
11028402
10535901
11047602
20403902
20403002
20608500
11045901
20403305
10469505
10485305
T2007705
T2007805
20400703
11028303
11027903
11028503
11028403
10535900
11047601
20403903
20403003
20608500
11045901
20403306
10469506
10485306
T2007706
T2007806
20400704
11028303
11027903
11028504
11028404
10535901
11047602
20403904
20403004
20608500
11045901
20403304
10469504
10485307
T2007704
T2007804
20400705
11028306
11027905
11028505
11028405
10535901
11047602
20403905
20403005
20608500
11045901
20403305
10469505
10485305
T2007705
T2007805
20400706
11028306
11027906
11028506
11028406
10535901
11047602
20403906
20403006
20608500
11045901
20403306
10469506
10485306
T2007706
T2007806
20404605
20404605
20404606
20404604
D2004201
11028200
20404607
20404606
20404608
20404606
D2004201
11028200
20404609
20404608
20404610
20404612
D2004201
11028200
20404605
20404605
20404606
20404604
D2004201
11028200
20404607
20404606
20404608
20404606
D2004201
11028200
20404609
20404608
20404610
20404612
D2004201
11028200
Therm JVi
Page 31
Page 35
26
23
24
25
22
21
13
8
25
7
12
16
15
29
30
27
9
37
36
32
10
31
35
38
18B
(left side)
33
32
4
17
18A
14
(right side)
11
34
5
6
2
1
28
19
20
3
Figure 14A. JVH Parts Identification.
ITEMS 14, 39
AND INSULATION
NOT SHOWN
Page 36
LAARS Heating Systems
10C Parts List JVS
Mini-Therm JVS
Description
JVS-50
JVS-75
JVS-100
R0061600
W0039600
R0061600
W0039600
R0061600
W0039600
R0385100
V0077500
L0052601
L0052500
L0056500
L0055900
R0385100
V0077500
L0052602
L0052500
L0056500
L0055900
L0032200
L0032900
JVS-160
JVS-225
R0061600
W0039600
R0061600
W0039600
R0061600
W0039600
R0407700
V0079100
L0052603
L0052500
L0056500
L0055900
R0407700
V0079100
L0052604
L0052500
L0056500
L0055900
R0407700
V0079100
L0052603
L0052500
L0056500
L0055900
R0407700
V0079100
L0052604
L0052500
L0056500
L0055900
L0032200
L0032900
L0032200
L0032900
L0032200
L0032900
L0032200
L0032900
L0032200
L0032900
Electrical System
Controller
Transformer 115/24V (40VA)
Ignition Control
Limit Switch
Blocked Vent SafetySwitch
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
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
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
Water System
Heat Exchanger
Pressure Relief Valve, 30PSI
Well, Immersion, 1/2" NPT
Well, Immersion, 3/4" NPT
Drain Valve 1/2" NPT (not shown)
Temp/Pressure Gauge (not shown)
R0402001
R0061400
E0025902
E2345700
70-216
R0060600
R0402002
R0061400
E0025902
E2345700
70-216
R0060600
R0402003
R0061400
E0025902
E2345700
70-216
R0060600
R0402004
R0061400
E0025902
E2345700
70-216
R0060600
R0402005
R0061400
E0025902
E2345700
70-216
R0060600
R0402006
R0061400
E0025902
E2345700
70-216
R0060600
Jacket and Fire Box Components
Draft Diverter
Rear Panel
Jacket
Top
Cover, Piping, Top
Flue Collector
Access Panel HX, (L&R)
Base, Control Box
Cover, Control Box
Burner Cover
Heat Exchanger Baffle
Tile Cover
Refractory, Front
Refractory, Rear
Base Assembly
Non-Combustible Base Kit (optional)
11020101
11020201
11020301
11020401
11047603
20034901
10535900
20608500
11045901
10500601
10485301
10469501
T0022001
T0021701
10467101
10466701
11020102
11020201
11020301
11020401
11047604
20034902
10535900
20608500
11045901
10500601
10485308
10469502
T0022002
T0021702
10467102
10466701
11020103
11020203
11020303
11020403
11047603
20034903
10535900
11045700
11045800
10500602
10485309
10469503
T0022003
T0021703
10467103
10466702
11020104
11020203
11020303
11020404
11047604
20034904
10535900
11045700
11045800
10500602
10485311
10469504
T0022004
T0021704
10467104
10466702
11020105
11020205
11020305
11020405
11047604
20034905
10535900
11045700
11045800
10494105
10485310
10469505
T0022605
T0021705
10467105
10466703
11020106
11020206
11020306
11020406
11047606
20034906
10535900
11045700
11045800
10494106
10485306
10469506
T0022606
T0021706
10467106
10466704
Vent Damper Components
Vent Damper Assembly (not shown)
Vent Damper Harness (not shown)
E2071501
E0099100
E2071502
E0099100
E2071502
E0099100
E2071503
E0099101
E2071503
E0099101
E2071504
E0099101
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)
Gas Orifices (not shown)
Gas Orifice (Nat.)
Gas Orifice (LP)
5
6
7
8
9
10
11
12
13A
13B
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Size
JVS-125
Mini-Therm JVS
Page 37
19
18
9
15
20
7
5
17
8
16
22
23
21
6
26
28
13B
12
(on left side)
25
13A
26
11
2
24
27
29
4
3
1
Figure 14B. JVS Parts Identification.
14
LAARS Heating Systems
H2355800-
Page 38
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
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