Bradford White Laars MINI-THERM JVH Owner's manual
Installation and Operation Instructions Document 1254D
Installation and
Operation Instructions for
MINI-THERM
Residential
Gas-Fired
Hydronic Boilers
Models JVH, JVS
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,
WARNING
If the information in this manual is not followed
exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
Do not store or use gasoline or other ammable
vapors and liquids in the vicinity of this or any
other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call the
re department.
Installation and service must be performed by
a qualied installer, service agency, or gas
supplier.
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 inammables 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 êtes.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions
du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur
de gaz, appelez le sservice des incendies.
L’installation et l’entretien doivent être assurés
par un installateur ou un service d’entretien
qualié ou par le fournisseur de gaz.
Vent damper is optional in some provinces of Canada..
Sizes 50-225
JVH
JVS
LAARS Heating Systems
TABLE OF CONTENTS
SECTION 1.
General Information
4
SECTION 2.
Boiler Assembly & Placement
4
5
5
SECTION 3.
Air and Venting
10
11
1Horizontal Venting - Category III12
2Venting Connections12
3Vent Terminations
SECTION 4.
Gas Connections
14
15
SECTION 5.
Water Connections
15
20
SECTION 6.
21
21
22-25
SECTION 7.
SECTION 8.
Operating Procedures
27
SECTION 9.
SECTION 10. Replacement Parts
MINI-THERM JV
SECTION 1.
General Information
1A. Introduction
This manual provides information necessary for
the installation, operation, and maintenance of the
Laars Mini-Therm model JV low pressure, copper
tube hydronic boilers. These boilers are available
in two congurations; 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
installation must conform to the requirements of
ATTENTION
1B. Warranty
The Laars Mini-Therm model JV boilers are covered
by a limited warranty. The owner should complete the
warranty registration online by going to www.Laars.
com. and select the 'Support' pull-down to nd the new
product warranty registration form.
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
led 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 eld
modication.
WARNING:
As required by the State of California Proposition 65.
www.P65Warnings.ca.gov.
Cancer and Reproductive Harm
LAARS Heating Systems
JVS
D
JVH
C
1C. Model Number and Nomenclature
The rating plate on the side of your Mini-Therm shows your Model Number. The original characteristics of
your unit can be identied using this nomenclature from your Model Number.
J V
SYST
S
H
0 5 0
0 7 5
1 0 0
1 2 5
1 6 0
2 2 5
N
P
SYST
C
D
S
I
J
S
H
I
J
2
U
VJ U 2
1 2 4 5 7 10 11 12
Table 1. Nomenclature.
SECTION 2.
Boiler Assembly and Placement
2A. Field Assembly
The Mini-Therm JV is available in two congurations.
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 right side of
the boiler, just above the drain.
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
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 ow
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 oor.
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 2).
2C. Flooring
JVS model boilers can only be installed on
noncombustible ooring.
JVH model boilers are designed and certied for
installation on a combustible oor.
All boilers must be installed on a level oor and
must NEVER be installed on carpeting.
NEVER store objects on or around the boiler.
Noncombustible ooring is dened as ooring
material and surface nish 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 oor 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 1. 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
WARNING
Avertissement
Caution
fastened to the damper by moving the damper
blade, turning the shaft or by turning the position
Attention
LAARS Heating Systems
inches
mm
Dimensions in
6
152
7
180
C B
25
635
2.4
61
24
610
7
180
9 -1/4
240
Size A B C Water
Connection Gas
Connection
in. mm in. mm in. mm
50
75
100
125
225
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
2D. JVH Dimensional Information
MINI-THERM JV
inches
mm
Dimensions in
6
152
7
180
C B
25
635
2.4
61
24
610
7
180
9 -1/4
240
Conn Gas
Conn
Size A B C D E V
mm mm mm mm mm mm
50 710 550 670 4 10
75 710 550 700 5
100 700 5
125 700 15
700 15
225 700 7
2D. JVS Dimensional Information
JVS Dimensions
LAARS Heating Systems
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.
Figure 2JVS. Closet Installation
Dimensions in inches cm
15
15
15
4*
10
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 1). If the boiler is installed in a
carpeted alcove, the entire oor 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 2JVH for
clearances required for the Mini-Therm JVH.
See Table 2JVS and Figure 2JVS for
clearances required for the Mini-Therm JVS
Figure 2JVH. Closet Installation.
SIDE
2
A2
5
Dimensions in
Air
Openings
B
Note:
Minimum Boiler Clearances from Combustible Surfaces.
Dégagements Minimaux à Assurer Entre Ics Parois de L’appareil et leo Constructions Combustibles
Boiler Sizes 50 - 225
Clearances in cm
2 5
Right side 5 15
Rear 2 5
Front 4 10
Flue 15
Top 58
Boiler Sizes 50 - 125
Clearances in cm in cm
15 15
Right side 15 15
Rear 15 15
Front 4 10 4 10
Flue 15 15
Top 58 91
Table 2JVS Minimum Boiler ClearancesTable 2JVH Minimum Boiler Clearances
MINI-THERM JV
Boiler Size Outside Air Area Inside Air Area
sq. in sq. cm sq. in. sq. cm
50 15 97 100 645
75 20 129 100 645
100 25 161 100 645
125 32 206 125 807
40 258 160 1032
225 60 387 225 1452
Table 3. 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 ue
products to accumulate in the boiler room. Additional
air must be supplied to compensate for such exhaust.
The information in Table 3 is not applicable in
installations where exhaust fans or blowers of any
type are used. Such installations must be designed by
qualied 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
Figure 3. Chimney Venting. Figure 4. Vertical Venting.
SECTION 3.
Air and Venting
3A. Combustion Air Supply
The boiler location must provide sucient 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 conned 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 oor.
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).
LAARS Heating Systems
air to the boiler, a suitable switch or equivalent must
be wired into the boiler control circuit to prevent the
boiler from ring 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: The Mini-Therm JVS is a natural
draft appliance for Category I venting only. The
Mini-Therm 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.
When venting as a Catagory I, 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.
When venting as a Category III horizontal, the
venting requires a stainless steel system that is in
compliance with the requirements of UL 1738 in
the United States or ULC–S636 in Canada and in
accordance with this section and with the venting
system manufacturer’s instructions. Plastic venting of
any kind is not permitted. The venting system must be
attached to the boiler vent collar, using the appropriate
Boiler Adapter. DO NOT ATTACH WITH SCREWS.
JVS must be connected only using Category Type
IMPORTANT
concernant votre demande de ventilation
RIDGE
RIDGE
Figure 5. Vertical Vent Termination.
WARNING
Improper venting of this appliance can result in
AVERTISSEMENT
aux dispositions de la partie 7, de la ventilation de
ventilation de cet appareil peut entraîner des
niveaux excessifs de monoxyde de carbone qui
MINI-THERM JV
Avoid terminating boiler vents near air conditioning
or air supply fans. The fans can pick up exhaust
ue products from the boiler and return them to the
building, creating a possible health hazard.
Avoid oversized vent pipe or extremely long runs
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 boilers can be
vented into a masonry chimney, (see Figures 3 and 4)
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.
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 replace,
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
WARNING
Do not store any chemical, cleaners, or other
corrosive material near combustion air openings
combustion air can result in reduced boiler life
AVERTISSEMENT
Éviter de placer des tuyaux de ventilation pour
WARNING
AVERTISSEMENT
provoquer un incendie causant des dommages
When installing the vent system, all applicable
Figure 6. Horizontal Vent Termination.
FORCED
GRADE
EXHAUST
HOOD
10
Dimensions in
LAARS Heating Systems
national and local codes must be followed! The use
of thimbles, restops and other protective devices,
when penetrating combustible or noncombustible
construction, must be in accordance with all applicable
national and local codes.
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 Annex F, 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 ue that has another appliance
attached to it.
3D-1. Horizontal Venting - Category III
(JVH only)
Category III horizontal venting requires a stainless
steel venting system that is in compliance with the
requirements of UL 1738 in the United States or
ULC–S636 in Canada and in accordance with this
section and with the venting system manufacturer’s
Instructions. Plastic venting of any kind is not
permitted. The venting system must be attached to the
boiler vent collar, using the appropriate Boiler Adapter.
DO NOT ATTACH WITH SCREWS.
Common venting is not allowed in Category III
systems unless designed and certied by a licensed
Professional Engineer.
3D-2 Venting Connections (JVH only)
Refer to venting supplier’s instructions for complete
parts list and method of installation. Table 1 lists
the manufacturers of products that comply with the
requirements of UL 1738 / ULC-S636 and the part
numbers of component parts. Do not mix venting
suppliers and models in venting systems. Failure
to comply could result in personal injury, property
damage, or death.
Installations must comply with applicable national,
state and local codes. The entire vent system must not
exceed the size specied in Table 2.
The following criteria must be observed:
1. If the horizontal run exceeds 5 ft (1.5 m) attach a
vertical section of not less than 12 in. (305 mm) to the
boiler vent collar using the appropriate adapter listed
above.
2. Support the vent runs with overhead hangers at
intervals specied in the vent system manufacturer’s
instructions.
3. Pitch the vent run down toward the vent terminal ¼
in. per foot (20mm per m).
The venting system must be attached to the boiler
vent collar, using the appropriate Boiler Adapter listed
above. DO NOT ATTACH WITH SCREWS.
All JVH models are to be vented with a 4” diameter
venting system of the equivalent length specied in
Table 4. The venting system of the JVH-225 may
be increased to 6” diameter to permit the longer
equivalent length indicated in Table 4. When installing
the 6” diameter system, install the Boiler Adapter to
the boiler ue collar and an Increaser or Increasers
to the Boiler Adapter to transition to the 6” diameter
system.
ALLOWABLE SINGLE WALL STAINLESS STEEL VENT SUPPLIERS AND PART NUMBERS
Example Components
DuraVent
Safe-
Boiler Adapter 5x01BOI FSAAUx
FSBSx
5X00CI FSRCx 2SVSRCxx
Inlet Air Termination FSAIHXX*
FSA--
FSAAUx-
*4", 6" & 7" only **up to 6"
Size
Diameter
mm
m
50 -
4
102
4
225 4
102
210
225 152 4
Horizontal Venting Configuration
Table 1. Allowable Single Wall Stainless Steel Vent Manufacturers and Part Numbers
MINI-THERM JV
Section 3D-3Vent Termination (JVH only)
The sidewall vent terminal and thimble are a part of
the vent system and must be selected from the chosen
vent system Model numbers listed with the other vent
system component parts in Section 3D-2. 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
applicable local codes (See Figure 6).
The location of the vent terminal should be chosen so
that exiting ue products don’t come in contact with
nearby shrubbery. In accordance with ANSI Z223.1/
NFPA 54, or CAN/CGA-B149, the terminal must
be located 12” above grade or the anticipated snow
level in areas where snow is expected. Follow any
additional local codes when choosing the location.
3E. Common Venting System
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 deciencies which could cause an unsafe
condition.
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
replace 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 ve
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,
replace 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/NFPA 54.
ALLOWABLE SINGLE WALL STAINLESS STEEL VENT SUPPLIERS AND PART NUMBERS
Example Components
DuraVent
Safe-
Boiler Adapter 5x01BOI FSAAUx
FSBSx
5X00CI FSRCx 2SVSRCxx
Inlet Air Termination FSAIHXX*
FSA--
FSAAUx-
*4", 6" & 7" only **up to 6"
Size
Diameter
mm
m
50 -
4
102
4
225 4
102
210
225 152 4
Horizontal Venting Configuration
Table 2. Horizontal Venting Conguration
WARNING
appliances connected to a common vent cannot
gasses into living spaces, common venting should
not be applied, and appliances should each be
AVERTISSEMENT
dispersion des gaz toxiques dans les espaces
LAARS Heating Systems
Figure 8. Gas Supply Piping.
RISER
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 certied to operate within
the altitude range indicated on the rating plate.
If a eld conversion to a dierent altitude range
or dierent gas should be necessary, conversion
parts are available. Contact a Laars representative
or the factory for the correct part numbers to
order for conversions
3. Use the gures in Table 6 to size the gas inlet piping
from the gas meter to the heater. Check all local
codes for compliance before installing the heater.
Boiler Size
Distance
From Gas
Meter 50 75 100 125 225
0-50
0-15m 1 1
1 1
1 1 1
*Note:
-
Table 6. Natural Gas Pipe Size Requirements*
Gas Supply
Inlet
Tee
Fitting
Cap
To Equipment
Inlet
Figure 9. Typical design for a sediment trap/drip leg.
Supply Pressure Minimum Maximum
Table 5. Gas Supply Pressure Requirements.
NOTE: The maximum inlet gas pressure must not
Table 5.
SECTION 4.
Gas Connections
4A Gas Supply and Piping
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.
Caution
Attention
Vous endommagerez la soupape de gaz
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 shuto 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 shuto
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 shuto 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 tting, or an undersized
gas meter. Gas supply pressures to the heater are
listed in Table 5.
NOTE
8. The correct high re 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 re at
both high and low re.
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 ame.
Caution
Attention
WARNING
The Mini-Therm JVS and JVH boilers are
boiler is designed to use the type of gas being
DO NOT ATTEMPT TO CONVERT
THIS HEATER FOR USE WITH ANY OTHER
TYPE OF FUEL.
AVERTISSEMENT
NE PAS ESSAYER DE CONVERTIR
CET APPAREIL À UN AUTRE TYPE DE GAZ.\ 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 lling 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-B149.2 ), any local codes and
re protection authorities about specic installation
restrictions in your area.
SECTION 5.
Water Connections
5A. Water Piping
Figure 10. 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 specic 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 the system at constant proper pressure
(see Figure 10). 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
LAARS Heating Systems
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 oor 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 oor stands, not the boiler.
A properly sized expansion tank must be included in
the system.
5B By-pass Piping
The following information and suggestions are made
on by-pass piping as it aects 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 ow. 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 10 and 11.
A full sized, 1¼" bypass with balancing valves is
strongly recommended for all systems, and required
when: 1) the boiler is installed without primary-
secondary 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 ow through the heat exchanger, causing
excessive temperature rise..
Note:
secondary piping system for all installations, especially
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 in-
oor radiant and snow melt systems.
5C Adjusting the bypass:
Refer to Figure 11. 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 11). Contact the factory for more
information.
Table 7. Temperature Rise °F °C.
l/s = Water ow in liters per second.
m = Pressure drop (headloss) through the boiler in meters of water.
15°F 8°C 20°F 11°C 25°F 14°C
gpm l/s ft mgpm l/s ft mgpm l/s ft m
0.30.1 4 0.30.10.20
0.5 0.2 0.4 0.1 0.3 0.1
0.70.40.50.20.40.2
0.8 0.7 10 0.6 0.4 0.5 0.2
1.10.80.80.50.60.4
225 24 1.5 5 1.5 1.1 0.9 0.9 0.6
MINI-THERM JV
Multi-Zone
Pump
System
Primary
Secondary
Multi-Zone
Pump System
Primary/Secondary Multi-Zone Valve System
Low Temperature Installation
JV JV
JV
JV
JV JV
Primary/Secondary Multi-Zone Valve System
Figure 10. Typical Plumbing Installations.
Multi-Zone
Valve System
Single Circuit System
LAARS Heating Systems
piping, one zone valve and up to eight elbows for
single zone systems. Consult the factory or a qualied
system designer if you have more ttings or dierent
size or type of pipe.
125
112
1
Table 8. Maximum Suggested Circuit Length in Feet.
* * * * * * *
75 * * * * * *
100 * * * * * *
125 * * * * *
* * * *
225 * * * * * * * 110 *
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 ow 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 sucient 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.
Figure 11. By-pass Piping.
Balancing Valve
or optional thermostat-
To
System
From
System
In
Out
Drip
Balancing
Valve
5E Flow Requirements
All high recovery, low volume water boilers must have
adequate ow for ecient operation. Pump selection
is critical to this goal, and pumps should be selected
to provide for system design water temperature rise.
Table 7 details temperature rise and water ow (GPM)
for the Mini-Therm boilers.
Damage from improper ow is not warranteed.
Failure to insure proper water ow through the heat
exchanger of the boiler will void the Laars warranty.
Flow can be veried by measuring the dierence
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 7, that would indicate a ow 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 ttings throughout
the system, smoothness of the interior surface of the
pipe, the quantity of water owing through the pipe,
whether a glycol solution is being used, and the total
length of piping in the system. Table 8 provides
example pump selection criteria using Type L copper
MINI-THERM JV
5 I Low Water Cut O (LWCO)
When this boiler is installed above radiation level,
it is required that a Low Water Cut-O (LWCO) be
installed unless this requirement is superceded by
Jurisdictional requirements. Specic instructions for
the installation are the following:
Locate the appropriate wiring diagram within this
manual. There are two diagrams, one for the JVH
Series and one for the JVS Series. These boilers are
available for operation on 115/60 Hz or 220/50 Hz
power. If this boiler is to be operated at 220/50 HZ
use only a 24 VAC LWCO device. Depending upon
the Voltage requirements of the chosen LWCO device
(24 VAC or 120 VAC) wire the power wires for the
device in the following manner: For 120 VAC LWCO
devices, wire the power wires in parallel with the
incoming supply power to the boiler. For 24 VAC
LWCO devices, wire the power wires in parallel with
the 24 VAC output from the boiler’s transformer.
On the appropriate wiring diagram, locate the HI
LIMIT. Connect the switch contact wires from the
LWCO device in series with the blue wire (JVH) or
Orange wire (JVS) to the HI LIMIT. Follow LWCO
device Manufacturer’s Wiring Instructions for
identication of power wires and switch contact wires.
Mechanically, install the LWCO device in a tee tting
in the supply piping above the highest point of the
boiler. Follow LWCO Manufacturer’s Instructions for
minimum pipe sizing.
Perform a test of the Low Water Cut O device
according to its Manufacturer’s Instructions before
leaving the boiler unattended.
Note: This boiler is a water tube boiler that requires
water ow through the heat exchanger for proper
operation. It does not have an operating water level
and must be full at all times. In accordance with ANSI/
ASME CSD-1 Section CW-210 and The National
Fuel Gas Code ANSI Z223.1/NFPA 54 Section 10.3.5
a water tube boiler shall have a water ow proving
device in lieu of a Low Water Cut O.
LAARS Heating Systems
Figure 12. Typical Plumbing Diagrams.
JV
From
System
To
System
NON-LOW TEMPERATURE SYSTEMS
(120°F+ Return Temps)
Simple Primary/Secondary Piping-Hydronic-Not Low Temp
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: Ball valves should not be used as balancing valves. Only use for shutoff apps.
LOW TEMP SYSTEMS
JV
120°+
From
System
To
System
Primary/Secondary Piping with Variable Speed Injection
Variable Speed
Control
Pump
Pump
Isolation Valve
Isolation
Valve
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.
From
System
To
System
Primary/Secondary Piping with Field Balancing
(for Fixed Low Return Temperatures)
JV
Pump
Isolation Valve
Isolation
Valve
Balancing
Valve
Balancing
Valve
Pump
From
System
To
System
Tempering Valve with System Loop
and Boiler Loop Pump
JV
Pump
Isolation Valve
Isolation
Valve
Tempering
Valve
Pump
From
System
To
System
Primary/Secondary
System Loop with Tempering Valve and Pump with Boiler Loop
with Tempering Valve and Pump
JV
Pump
Isolation Valve
Isolation
Valve
Tempering
Valve
Pump
Tempering
Valve
Isolation
Valve
Isolation
Valve
Pump
Pump
JV
From
System
To
System
Primary/Secondary Piping with By-Pass
(for Fixed Low Return Temperatures)
Pump
Isolation
Valve
Pump
Isolation
Valve
Balancing
Valve
Balancing
Valve
Primary/Secondary Piping with Automatic By-Pass
Pump
Pump Isolation
Valve
Isolation
Valve
Auto
By-Pass
Valve
From
System
To
System
JV
JV
From
System
To
System
Primary/Secondary Piping with Laars
Thermostatic Union as an Automatic Bypass
Pump
Isolation
Valve
Pump
Isolation
Valve
Laars
Thermostatic
Union
PN 2400-030
Balancing
Valve
5 J Typical Plumbing Diagrams
This manual suits for next models
14
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