LAARS NTV1700 User Manual
Installation and Operation Instructions Document 1255B
Installation and
Operation Instructions for
®
NEOTHERM
LC
Modulating Boiler Water Heater
Model NTH1000 Model NTV1000
1,000 MBTU/h 1,000 MBTU/h
Model NTH1700 Model NTV1700
1,700 MBTU/h 1,700 MBTU/h
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualied in hot water boiler and heater installation and maintenance. Improper installation and/or operation
could create carbon monoxide gas in ue gases which could cause serious injury, property damage, or
death. Improper installation and/or operation will void the warranty.
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.
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.
AVERTISSEMENT
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.
H2352900B
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
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 qualié ou
par le fournisseur de gaz.
NeoTherm LC Boilers and Water Heaters
Table of Contents
Section 1
GENERAL INFORMATION ....................................... 1
1.1 Introduction ............................................... 1
1.2 About the Touch Screen ........................... 1
1.3 Safety Notes ............................................. 3
1.4 ModelIdentication/Nomenclature ......... 3
1.5 Warranty ................................................... 4
1.6 Appliance Overview .................................. 4
1.7 Dimensions ............................................... 6
1.8 Unpacking ................................................. 6
Section 2
LOCATING THE APPLIANCE .................................. 8
2.1 Locating the Appliance ............................. 8
2.2 Correct Vent Distance
fromOutsideWallorRoofTermination ..... 8
Section 3
VENTING AND COMBUSTION AIR ......................... 9
3.1 CombustionAir ......................................... 9
3.1.1 CombustionAirFromRoom ..................... 9
3.1.2 DuctedCombustionAir ........................... 10
3.2 Venting .....................................................11
3.2.1 CommonVenting .....................................11
3.2.3 VentingRequirementsUniquetoCanada 11
3.3 LocatingtheVentandCombustionAir
Terminals ................................................ 12
3.3.1 SideWallVentTerminal .......................... 12
3.3.2 SideWallCombustionAirTerminal ......... 14
3.3.3 VerticalVentTerminal ............................. 15
3.3.4 VerticalCombustionAirTerminal ............ 15
3.3.5 InstallationsintheCommonwealthof
Massachusetts ........................................ 15
3.4 CommonVentTest ................................. 15
3.5 Outdoor Installation ................................ 16
3.6 Condensate Trap .................................... 16
Section 4
GAS SUPPLY AND PIPING ................................... 17
4.1 Gas Supply and Piping ........................... 17
Distance & Pipe Size, Tables .................. 18
Section 5
PUMP REQUIREMENTS ....................................... 19
5.1 NeoThermLCBoilerFlowandHead
Requirements ......................................... 20
5.2 NeoThermLCWaterHeaterFlowand ......
HeadRequirements ................................ 19
Section 6
WATER CONNECTIONS ....................................... 20
Section 6A - NTH Systems ..................................... 20
6A.1 NTHSystemPiping:HotSupply
Connections ............................................ 20
6A.2 NTH Cold Water Make-Up ...................... 20
6A.3 NTH Freeze Protection ........................... 21
6A.4 NTHSuggestedPipingSchematics ....... 21
6A.5 Condensate Trap .................................... 21
Section 6B - NTV Systems ..................................... 27
6B.1 NTV Water Quality .................................. 27
6B.2 NTVPipingRequirements ...................... 27
6B.3 NTV Cold Water Make-Up ...................... 28
6B.4 NTV Freeze Protection ........................... 28
6B.5 NTVSuggestedPipingSchematics ........ 28
6B.6 NTVSuggestedPumps .......................... 29
6B.7 Condensate Trap .................................... 29
Section 7
ELECTRICAL CONNECTIONS .............................. 30
7.1 Main Power ............................................. 30
7.2 PumpConnections ................................. 30
7.3 24VACTransformerwithIntegral
Circuit Breaker ........................................ 32
7.4 Signal Connections ................................. 32
7.5 Optional Field Connections .................... 32
7.6 LadderDiagrams .................................... 33
WiringDiagrams ..................................... 34
Section 8
USING THE TOUCH SCREEN AND GAUGES...... 36
8.1 The Touch Screen and Gauges on the Front
oftheNeoThermLC ............................... 36
8.2 Using the Touch Screen .......................... 36
8.3 WhileOperating–CheckingLead/Lag
OperatingInformation ............................. 38
8.4 CheckingLead/LagMaster ..................... 38
8.5 While Operating - Checking Individual
Parameters ............................................. 39
8.6 Checking Individual Details .................... 40
8.7 ConguringParametersonIndividual
Controllers .............................................. 40
8.8 VericationProcessforSafety-Related
Parameters ............................................. 41
i
Section 9 –
SETUP AND CONFIGURATION ............................ 44
9.1 ReviewofLead/LagControlSystem ...... 44
9.1.1 AboutLead/LagOperation ..................... 44
9.1.2 Lead/LagModulationCycle .................... 45
9.1.3 NTHLead/LagwithIndirect
DomesticHotWater ................................ 46
9.2 ConnectionTerminals ............................. 46
9.3 NeoThermLCSystemCongurations .. 46-54
9.4 Installation Jobs ...................................... 55
A NoteforSystemsUsingCommon
Venting .................................................... 55
B NamingtheControllers ........................... 55
C MakeOneControltheLead/Lag
Master ..................................................... 56
D DisabletheLead/LagMasterFunction
ontheLead/LagSlaves .......................... 57
E Set up the Modbus Control Addressing .. 58
F Set the Flap Valve IDs ............................ 59
G Disconnect Unused Operator
Interfaces ................................................ 63
H Connect the Modbus Wiring ................... 63
I SettheParametersUsedbythe
Lead/LagSystem .................................... 64
Aboutthe“TimeofDay”Function ........... 68
J InstalltheSystemSensorandAdjust
the Setpoint ............................................ 68
K SettheLead/LagOutdoorResetand
WarmWeatherShutdown ....................... 68
About“OutdoorReset” ........................... 69
L BuildingAutomationorMultipleBoiler
ControlThermostatDemand ................. 70
M BuildingAutomationorMultipleBoiler
4-20mASetpointControl ....................... 70
N BuildingAutomationorMultipleBoiler
4-20mAModulationControl .................... 71
O CombustionSetupProcedure ................ 71
P SettingtheDateandTimeonthe
SystemDisplay ....................................... 76
9.5 SetupforDomesticHotWaterona
Lead/LagSystem .................................... 77
Setup Type 1 ........................................... 77
Setup Type 2 ........................................... 78
Setup Type 3 ........................................... 79
9.6 Gateway Connections to a
BuildingAutomationSystem ................... 80
9.7 Setup for High Altitude Operation -
NT 1700 Only .......................................... 80
9.8 InstallerParameters .......................... 81-87
Section 10 -
INITIAL STARTUP INSTRUCTIONS ...................... 88
10.1 FillingtheBoilerSystem ......................... 88
10.2 Initial Operation ...................................... 89
LAARS Heating Systems
10.2.1 Initial Burner Operation ........................... 89
10.2.2 CombustionSetupProcedure ................ 89
10.3 ShuttingDowntheNeoThermLC ........... 89
10.4 RestartingtheNeoThermLC .................. 89
Section 11
MAINTENANCE ..................................................... 90
11.1 SystemMaintenance .............................. 90
11.2 Maintenance Notes ................................. 90
11.2.1 Burner ..................................................... 90
11.2.2 ModulatingGasValve/Venturi ................ 90
11.2.3 Controllers .............................................. 91
11.2.4 IgnitorAssembly ..................................... 91
11.2.5 FlameSensor ......................................... 91
11.2.6 TransformerwithIntegral
Circuit Breaker ........................................ 91
11.2.7 Blower ..................................................... 92
11.2.8 Heat Exchanger Coils ............................. 92
11.2.9 Gas Pressure Switches (optional) .......... 92
11.2.10Natural/PropaneGasConversion ......... 93
11.2.11 Condensate Trap .................................. 93
11.2.12 Battery(Date&TimeBack-Up) ............ 93
Section 12
TROUBLESHOOTING ........................................... 94
12.1 Potential Setup and Synchronization
Problems ................................................ 94
12.1.1 Controller Synchronization ..................... 94
12.1.2 Flap Valve Status Checks ....................... 95
12.2 About Lockouts, Holds, and Alerts .......... 95
12.2.1 Responding to a Lockout, Hold,
or Alert .................................................... 95
12.2.2 Viewing the Lockout and Alert
Histories .................................................. 96
12.3 Troubleshooting Tables (all codes)......98-112
12.4 DiagnosticTestsandInput/Output
Indicators ...............................................11 3
12.5 Lead/LagSlaveDiagnostics ..................11 4
12.6 Statistics ................................................11 4
12.7 Analysis .................................................11 4
12.8 Control Snapshot ...................................11 5
12.9 Operating Sequence ..............................11 5
Section 13
REPLACEMENT PARTS .......................................118
13.1 GeneralInformation ...............................11 8
13.2 Parts List ................................................11 8
13.3 Parts Illustrations .................................. 124
ii
LAARS Heating Systems
NeoTherm LC Boilers and Water Heaters
Page 1
Section 1
GENERAL INFORMATION
1.1 Introduction
This manual includes information which will help
you to install, operate, and maintain the NeoTherm
LC 1000 and 1700 systems. Please read this manual
completely before proceeding with the installation.
If you have any questions regarding this equipment,
please consult the LAARS Heating Systems factory,
or a local factory representative. Many operating
problems are caused by improper installation.
Touch Screen Display
(behind the plastic cover
which slides downward)
Pressure and
temperature
gauge
Power switch
If eld conditions require modications, consult
the factory representative before initiating such
modications.
1.2 About the NeoTherm LC
Touch Screen Display
The NeoTherm LC has an advanced control system
which can perform many functions. This is part
of the reason why the NeoTherm LC 1000 or 1700
can deliver such outstanding performance. You
can access the control system using the ‘Touch
Screen Display’ (see Section 8). There are several
“branches” in the control software, and many
different display screens. For clarity, throughout
this manual we have made a special effort to show
you how to reach each of the important setup and
operating functions. We have done this in two ways:
• In many cases, we have shown you the actual
touch screen display that you will see while
performing a function.
• Sometimes, instead of showing the screens, we
have just listed the series of choices you should
make in order to reach the section you want.
The arrangement of the control software is actually
quite logical, and after you have worked with it a bit,
you will not have any problems “nding your way
around.” We just want to give you some help with
the rst part of the process, when you are “getting
used to” the control system .
WARNING
NeoTherm LC units must be installed in
accordance with the procedures detailed in
this manual, or the LAARS Heating Systems
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/NFPA54. In Canada,
the installation must conform to the latest edition
of CSA B149.1 Natural Gas and Propane Gas
Installation Code, and/or local codes. Where
required by the authority having jurisdiction,
the installation of NeoTherm LC boilers must
conform to the Standard for Controls and Safety
Devices for Automatically Fired Boilers, ANSI/
ASME CSD-1. Any modications to the boiler,
its gas controls, or wiring may void the warranty.
Later in this manual, we will detail information on
the setup and operating procedures. There are a
couple of concepts you will need to understand right
from the start.
• Each boiler has two controllers (internal
electronic burner controllers) and two burners,
as shown in Fig. 1.
• A single Touch Screen is used to communicate
with these two controllers.
Boiler 1
Touch
Screen
Fig. 1 – Control Arrangement in a Single-Boiler
Installation
Primary
controller
Gas
valve
Gas
valve
Secondary
controller
Primary
burner
Secondary
burner
Page 2
LAARS Heating Systems
• Each controller and burner work together. Each
boiler includes two of these controller/burner
combinations.
Notice the different terms we are using here.
The term boiler refers to the whole appliance
– the complete NeoTherm LC 1000 or 1700.
Each boiler includes two separate controller/
burner pairs.
• NeoTherm LC 1000 and 1700 units are always
set up for “Lead/Lag” operation. The term
“Lead/Lag” means that, as the heating load
increases, the control system brings additional
burners on automatically.
Touch
Screen
Boiler 1
Addr1Addr2Addr3Addr4Addr5Addr6Addr7Addr
Lead Lag
Master and
Slave 1
Slave 2
Boiler 2
Slave 3
Slave 4
Boiler 3
Slave 5
Slave 6
Boiler 4
8
Slave 7
Slave 8
By changing this one value, you change the
setpoint used by the whole system. The action
of all of the controller/burner pairs will refer
back to that single value.
On the Touch Screen, from the ‘home’ screen
you can reach all of the Lead/Lag functions by
pressing the View Lead Lag button. See Fig. 3.
• INDIVIDUAL FUNCTIONS, Other functions
apply only to each separate controller/burner
pair. As an example, each controller/burner has
a name, and this can be changed.
The ‘home’ screen on the Touch Screen will
show icons for each of the controller/burner
pairs connected to the system. To reach one
of the functions for an individual controller/
burner, press the icon for that controller/
burner. On the following screen, press the
Congure button. This will take you to all of
the conguration options for that individual
controller/burner.
Fig. 2 – Lead/Lag Arrangement in a Multiple-
Boiler Installation
On a multiple-boiler installation, each of the
individual boilers is still set up as shown in Fig. 1
above, but the controller/burner pairs on all of the
boilers are arranged in a “daisy chain.”
Up to four boilers, with up to eight controller/burner
pairs, can be connected in this way. See Fig. 2.
In all NeoTherm LC multiple-boiler installations,
just one of the Touch Screens is active. It can
communicate with all of the controller/burner pairs
in the system, so it displays information from all of
the burners. A single system sensor provides the
control input for the system.
All NeoTherm LC’s that are set up as a single
boiler will still uses a Lead/Lag operation. If the
heating load becomes too great for the rst burner,
the control system automatically starts the second
burner.
To work with this control system, you will need
to understand the difference between two kinds of
control functions:
• SYSTEM FUNCTIONS, Some of the
functions control all of the controller/burner
pairs, working together as part of the Lead/
Lag system. As an example, the setpoint for a
whole multiple-boiler system is set by a single
value: “Central Heat Lead/Lag Setpoint.”
Press here for
system setup
Press here to
see current
Lead/ Lag
performance
Press here
for individual
controller/
burner pairs
Press here
for Lead/ Lag
setup
Fig. 3 – Going to Lead/Lag and Individual
Functions
Note – For individual functions, if you want to make
a change on all of the controller/burner pairs in the
system, you will have to go to each controller/burner
separately and repeat the change for each of them.
If there are eight controller/burners in the system,
and you want to make the same change on all of
them, go to each of the eight controller/burner pairs
separately.
As we go through the explanations in this manual,
we will point out whether a control function affects
the whole Lead/Lag system, or just an individual
controller/burner pair.
This has been just a quick introduction, but this
NeoTherm LC Boilers and Water Heaters
Page 3
manual includes two longer sections that will help
you to work with the control system:
requirements take precedence over the general
instructions contained herein.
• Section 8 – “Using the Touch Screen and the
Gauges.”
This section will explain how to “Navigate”
through the Touch Screen : how to enter and
change values, and so on.
• Section 9 – “Setup and Conguration”
The rst part of this section includes a more
complete explanation of the Lead/Lag system.
The rest of the section includes detailed setup
instructions.
If you are not familiar with the control system, the
installation and setup process will go much more
smoothly if you read through these three sections
before beginning work.
Carbon Monoxide Hazard
Improper adjustment of the burners may lead to poor
combustion quality, increasing the amount of carbon
monoxide produced. Excessive carbon monoxide
levels may lead to personal injury or death.
Electrical Shock Hazard
Electrical shock can cause severe injury, death or
property damage. Disconnect the power supply
before beginning installation or changing the
WARNING
WARNING
wiring to prevent electrical shock or damage to the
1.3 Safety Notes
equipment. It may be necessary to turn off more than
one power supply disconnect.
All electrical wiring is to be done in accordance with
WARNING
Fire or Explosion Hazard
Improper conguration can cause fuel buildup and
explosion. Improper user operation may result in
property loss, severe physical injury, or death.
local codes, or in the absence of local codes, with:
1) The National Electrical Code ANSI/NFPA No.
70 - latest Edition, or 2) CSA STD. C22.1 “Canadian
Electrical Code - Part 1.” This appliance must be
electrically grounded in accordance with these
codes.
Any changes to safety-related conguration
parameters must only be done by experienced and/or
licensed burner/boiler operators and mechanics.
If any odor of gas is detected, or if the gas burner
does not appear to be functioning in a normal
manner, close the main gas shutoff valve. Do not
shut off the power switch. Contact your heating
contractor, gas company, or factory representative.
The NeoTherm LC Appliance is protected against
over-pressurization. A pressure relief valve is
included with each NeoTherm LC.
The inlet gas pressure to the appliance must not
exceed 13” W.C. (3.2 kPa).
All installations must be made in accordance with
1) American National Standard Z223.1/NFPA54-
Latest Edition “National Fuel Gas Code” or 2) CSA
B149.1 “Natural Gas and Propane Installation Code”
and with the requirement of the local utility or other
authorities having jurisdiction. Such applicable
Model Nomenclature
1 2 3 4 5 6 8 9 10 11
N T H 1
SERIES
N T
USAGE
H - HYDRONIC
V - VOLUME
WATER
SIZE
MBTU/h
1 0 0 0
1 7 0 0
7
FUEL
N - NATURAL
P - PROPANE
1.4 ModelIdentication
Consult the rating plate on the unit. The following
information describes the model number structure.
(1-2) Model Series Designation
N T = NeoTherm LC
(3) Usage
H = Hydronic
V = Volume Water
(4-7) Size
1 0 0 0 = 1,000,000 BTU/hr input
1 7 0 0 = 1,700,000 BTU/hr input
(8) Fuel
N = Natural Gas
P = LP Gas
(9) Options Code
J = CSD1 Version
X = Standard Unit
(10) Pump Options
X = No pump
(11) Revision
1 = First version
OPTIONS CODE
J - CSD1
X - STANDARD
PUMP OPTIONS
X - NO PUMP
REVISION
1 - FIRST
Page 4
LAARS Heating Systems
1.5 Warranty
LAARS Heating Systems’ NeoTherm LC appliances
are covered by a limited warranty. The owner should
complete the warranty registration at:
http://www.Laars.com
All warranty claims must be made to an authorized
LAARS Heating Systems representative. Claims
must include the serial number and model. (This
information can be found on the rating plate.) The
1.6 Appliance Overview
Protective Cover
(slides downward)
Pressure and
temperature
gauge
Blower 1
(under bezel)
Touchscreen
*
Power switch
claim must also include the installation date and
name of the installer. Shipping costs are not included
in the warranty coverage.
Some accessory items may be 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.
Ducted air inlet
Electrical box
PRV and
ow switch
Automatic
gas valves
Manual
gas valve
Blower 2
Outlet
temperature
sensors
Inlet
temperature
sensors
Condensate
trap
Leveling feet
Model 1000
NeoTherm Boilers and Water Heaters
The Touchscreen does have an internal battery for
*
back-up of the date and time settings. To access the
battery, the front panel and the Touchscreen must be
removed so that the small plastic door on the back of the
touchscreen can be accessed.
The battery is a CR2032 ‘coin type’ battery and has
an expected shelf life of 10 years.
Page 5
Protective Cover
(slides downward)
Pressure and
temperature
gauge
Blower 1
(behind bezel)
Automatic
gas valves
Blower 2
Touchscreen
*
Power switch
Ducted air inlet
Electrical box
PRV and
ow switch
Outlet
temperature
sensors
Inlet
temperature
sensors
Manual
gas valve
(on back)
Model 1700
Condensate
trap
Leveling feet
Page 6
LAARS Heating Systems
Fig. 5 - Dimensions - NT 1000
1.7 Dimensions
The dimensions are shown in Fig. 5 and
Fig. 6.
1.8 Unpacking
The NeoTherm LC is shipped in a single crate. The
standard outdoor/system sensor kit is packed inside
the same crate.
1. Remove all packing and tie-down materials.
2. Check that the outdoor/system sensor kit is
included.
DANGER
• Water temperature over 125°F (52°C) can cause
severe burns instantly or death from scalds.
• Children, disabled and elderly are at highest risk of
being scalded.
• See instruction manual before
setting temperature at
heating appliance.
• Feel water before
bathing or showering.
• If this appliance is used
to produce water that
could scald if too hot,
such as domestic hot water
use, adjust the outlet
control (limit) or use temperature limiting valves
to obtain a maximum water temperature of 125°F
(52°C).
NeoTherm LC Boilers and Water Heaters
Page 7
Fig. 6 - Dimensions - NT 1700
Page 8
Section 2
LOCATING THE APPLIANCE
APPLIANCE SUGGESTED SERVICE ACCESS CLEARANCE
SURFACE INCHES CM
LAARS Heating Systems
2.1 Locating the Appliance
The NeoTherm LC may be installed indoors or
outdoors. The unit may only be installed outdoors
in a location which will never experience freezing
temperatures. Choose a location for the unit which
allows clearances on all sides for maintenance and
inspection. See Table 1. Always install the unit on a
rm, level surface. Level the unit using the leveling
feet.
The unit should not be located in an area where
leakage of any connections will result in damage to
the area adjacent to the appliance, or to lower oors
of the structure.
When this type of location is not available, install
a suitable drain pan, adequately drained, under the
appliance.
The appliance is design-certied by CSAInternational for installation on combustible ooring;
in basements; in closets, utility rooms or alcoves.
NeoTherm LC boilers must never be installed
on carpeting. The location for the appliance should
be chosen with regard to the vent pipe lengths and
external plumbing.
The unit shall be installed such that the gas ignition
system components are protected from water (dripping,
spraying, rain, etc.) during operation and service
(circulator replacement, control replacement, etc.).
When vented vertically, the NeoTherm LC must be
located as close as practical to the vertical section
of the vent. If the vent terminal and/or combustion
air terminal terminate through a wall, and there is
potential for snow accumulation in the local area,
both terminals should be installed at an appropriate
level above grade or the maximum expected snow
line.
The dimensions and requirements that are shown in
Table 1 should be met when choosing the locations
for the appliance.
2.2 Correct Vent Distance from
Outside Wall or Roof Termination
The forced draft combustion air blower in the
appliance has sufcient power to vent properly when
the guidelines in Table 2 are followed.
Front 24 60.9
Left Side 12 30.5
Right Side 18 45.7
Back 24 60.9
Top 24 60.9
APPLIANCE REQUIRED CLEARANCE TO COMBUSTIBLES
SURFACE INCHES CM
Front 2 5.1
Left Side 0 0
Right Side 0 0
Back 0 0
Top 8 20.3
Vent 1 2.6
Table 1 - Clearances
INTAKE / EXHAUST
STANDARD MAX EQUIV.
SIZE VENT FT. M
1000 6” 100 30
1700 8” 100 30
Installations in the U.S. require exhaust vent pipe that is PVC or
CPVC complying with ANSI/ASTM D1785 F441, polypropylene
complying with ULC-S636, or stainless steel complying with
UL1738. Installations in Canada require exhaust vent pipe that is
certied to ULC S636.
Intake (air) pipe must be PVC or CPVC that complies with ANSI/
ASTM D1785 F441, ABS that complies with ANSI/ASTM D1527,
stainless steel, or galvanized material.
Closet and alcove installations do not allow the use of PVC under
any circumstances
To calculate max equivalent length, measure the linear feet of the
pipe, and add 5 feet (1.5 m) for each elbow used.
Table 2 - Vent / Air Pipe Sizes
Note - When located on the same wall, the
NeoTherm LC combustion air intake terminal must
be installed a minimum of 12” below the exhaust
terminal. There must also be a minimum horizontal
distance from intake to the exhaust terminal of 36.”
For the concentric vent terminal kit (optional), follow
the installation instructions included with the kit.
NeoTherm LC Boilers and Water Heaters
Section 3
VENTING AND COMBUSTION AIR
3.1 Combustion Air
NeoTherm LC boilers and water heaters must
have provisions for combustion and ventilation
air in accordance with the applicable requirements
for Combustion Air Supply and Ventilation in the
National Fuel Gas Code, ANSI Z223 1; or in Canada,
the Natural Gas and Propane Installation Code, CSA
B149.1. All applicable provisions of local building
codes must also be adhered to.
A NeoTherm LC can take combustion air
from the space in which it is installed, or the
combustion air can be ducted directly to the unit.
Ventilation air must be provided in either case.
3.1.1 Combustion Air From Room
In the United States, the most common requirements
specify that the space shall communicate with the
outdoors in accordance with Method 1 or 2. (See the
following descriptions.) Where ducts are used, they
Page 9
shall be of the same cross-sectional area as the free
area of the openings to which they connect.
Method 1: Two permanent openings, one
commencing within 12” (300 mm) of the top and
one commencing within 12” (300 mm) of the
bottom, of the enclosure shall be provided. The
openings shall communicate directly, or by ducts,
with the outdoors or spaces that freely communicate
with the outdoors. When directly communicating
with the outdoors, or when communicating to the
outdoors through vertical ducts, each opening shall
have a minimum free area of 1 square inch per
4000 Btu/hr (550 square mm/kW) of total input
rating of all equipment in the enclosure. When
communicating to the outdoors through horizontal
ducts, each opening shall have a minimum free
area of not less than 1 square inch per 2000 Btu/
hr (1100 square mm/kW) of total input rating of all
equipment in the enclosure.
PVC CPVC Stainless Steel Polypropylene
Model Ducted Air Exhaust Ducted Air Exhaust Ducted Air Exhaust Ducted Air Exhaust
1,000 CA008100 CA008300 CA008100 CA008300 CA008200 D2004500 CA008500 CS008500
1,700 CA010700 CA010900 CA010700 CA010900 CA011000 CA011100 CA011000 CA011100
Table 3a - Horizontal Terminations for Indoor Use
PVC CPVC Stainless Steel Polypropylene
Model Ducted Air Exhaust Ducted Air Exhaust Ducted Air Exhaust Ducted Air Exhaust
1,000 CA008400 CA008300 CA008400 CA008300 CA008500 CA008500 CA008500 CA008500
1,700 CA010800 CA010900 CA010700 CA010900 CA011300 CA011200 CA011200 CA011200
Table 3b - Vertical Terminations for Indoor Use
Model Ducted Air Exhaust
1,000 CA008700 CA008900
1,700 CA010400 CA011500
Table 3c - Outdoor Terminations
Material United States Canada
ABS ANSI/ASTM D1527 The air pipe material must be chosen based upon
PVC, sch. 40 ANSI/ASTM D1785 or D2665
CPVC, sch. 40 ANSI/ASTM F441
Single wall galv. steel 26 gauge
Polypropylene ULC-S636 Class 2C
the intended application of the boiler, and must
be installed according to the vent manufacturer’s
installation instructions.
Table 4 - Required Combustion Air Pipe Material
Page 10
LAARS Heating Systems
Method 2: One permanent opening, commencing
within 12” (300 mm) of the top of the enclosure,
shall be permitted. The opening shall directly
communicate with the outdoors or shall
communicate through a vertical or horizontal duct
to the outdoors or spaces that directly communicate
with the outdoors and shall have a minimum free
area of 1 square inch per 3000 Btu/hr (734 square
mm/kW) of the total input rating of all equipment
located in the enclosure. This opening must not be
less than the sum of the areas of all vent connectors
in the conned space.
Other methods of introducing combustion and
ventilation air are acceptable, providing they
conform to the requirements in the applicable codes
listed above.
In Canada, consult local building and safety codes
or, in absence of such requirements, follow CAN/
CSA B149.
3.1.2 Ducted Combustion Air
The combustion air can be taken through the wall, or
through the roof. When taken from the wall, it must
be taken from out-of-doors by means of the LAARS
horizontal wall terminal, shown in Table 3a. See
Table 2 to select the appropriate diameter air pipe.
When taken from the roof, a eld-supplied rain cap
or an elbow arrangement must be used to prevent
entry of rain water. (See Fig. 7).
Use ABS, PVC, CPVC, polypropylene, stainless
steel, or galvanized pipe for the combustion air
intake. (See Table 4.) The intake must be sized per
Table 2. Route the intake to the boiler as directly
as possible. Seal all joints. Provide adequate
hangers. The unit must not support the weight of the
combustion air intake pipe. The maximum linear
pipe length allowed is 100 feet (39 m). Subtract 5
allowable linear ft. (1.5 m) for every elbow used.
When using polypropylene or stainless steel
materials in horizontal duct congurations, a single
elbow must be installed on the end of the air inlet
to act as an outdoor terminal. In vertical duct
applications, two elbows must be installed on the
end of the inlet to act as a vent terminal. In both
installation types, Laars part number CA008500 (for
Model 1,000) or CA011300 (for Model 1,700) can
then be installed into the elbow to prevent foreign
objects from entering the air inlet system. The
elbow(s) required to complete the vent terminal is
not included.
The connection for the intake air pipe is on the back
panel.
In addition to air needed for combustion, air shall
also be supplied for ventilation, including air
required for comfort and proper working conditions
for personnel. Refer to the applicable codes.
*
*
*
In Canada, refer to CAN/CSA B199.1
*
*
Fig. 7 - Combustion Air and Vent Through Roof
*
*
Material United States Canada
Stainless steel UL 1738 Venting must be ULC-S636 certied for use as
PVC*, sch 40 ANSI/ASTM D178
CPVC, sch 40 ANSI/ASTM F441
Polypropylene UL-S636 Class 2C
* PVC cannot be used for the rst 12 inches of vent material
Table 5 - Required Exhaust Vent Material
Installation Standards
venting material. The venting material class must
be chosen based upon the intended application
of the boiler, and must be installed according to
the maximum ue gas temperature and the vent
manufacturer’s instructions.
NeoTherm LC Boilers and Water Heaters
Page 11
3.2 Venting
WARNING
Selection of improper vent materials for installations
that are installed in closets, or will be operated
in high ambient temperature levels, may lead to
property damage, personal injury, or death.
WARNING
A 12” or 305 mm section (for Model 1000) or 36” or
915 mm section (for Model 1700) of CPVC must be
connected directly to the boiler before a PVC vent
system can be used. Connecting PVC directly to the
boiler’s ue collar may cause vent failure, leading to
property damage, personal injury, or death.
WARNING
Failure to use the appropriate vent material,
installation techniques, or glues and sealants could
lead to vent failure causing property damage,
personal injury or death.
WARNING
All venting must be installed according to this
manual and any other applicable local codes,
including but not limited to, ANSI Z223.1/NFPA 54,
CSA B149.1, CSAB149.2 and ULC-S636. Failure to
follow this manual and applicable codes may lead to
property damage, severe injury, or death.
The ue temperature of the NeoTherm LC
changes dramatically with changes in operating
water temperature. Therefore, it is necessary to
assess the application of the boiler to determine
the required certied vent class. If the NeoTherm
LC is installed in an application where the
ambient temperature is elevated, and/or installed
in a closet/alcove, CPVC, polypropylene, or
stainless steel material is required. If the system
temperatures are unknown at the time of
installation, class IIC or higher venting material
is recommended.
The NeoTherm LC is a Category IV appliance and
may be installed with PVC, CPVC that complies
with ANSI/ASTM D1785 F441, or polypropylene
that complies with ULC-S636 Class 2C, or a
stainless steel venting system that complies with the
UL 1738 Standard. (See Table 5.) The unit’s vent
can terminate through the roof, or through an outside
wall.
The use of polypropylene vent material has
been accepted by CSA for use with exhaust and
combustion. The polypropylene vent manufacturer
shall have ULCS636 Class 2C approval or higher
with a recognized listing agency for all components
used in the venting system. All components used
must be from the same manufacturer and designed
for use with exhaust temperatures of 195°F
(90°C) or higher. When installing polypropylene
vent systems, please, refer to the vent supplier’s
installation instructions for proper installation
techniques.
When using PVC/CPVC for the vent material, the
rst 12 inches or 305 mm (for Model 1000) or 36”
or 915 mm (for Model 1700) of the vent must be
connected to the CPVC section included with the
NeoTherm LC. The CPVC vent section included
with the NeoTherm LC may be broken by CPVC
ttings if necessary, but never reduced in total
length. See Table 2 to select the appropriate vent
pipe diameter.
When using polypropylene, all vent material must be
from the same manufacturer and UL-S636 rated.
All installations must be done following the vent
supplier’s recommended installation techniques.
If these are not available, refer to the Laars
recommendations for the material used.
The vent pipe must pitch upward, toward the
vent terminal, not less than 1/4” per foot, so that
condensate will run back to the NeoTherm LC to
drain. Route the vent pipe to the heater as directly as
possible. Seal all joints. Provide adequate hangers
as required in the venting system manufacturer’s
Installation Instructions. Horizontal portions of the
venting system must be supported to prevent sagging
and may not have any low sections that could trap
condensate. The unit must not support the weight of
the vent pipe. Please see Table 2 for proper diameter
vs. length allowed.
3.2.1 Common Venting
A single vent that is shared by multiple NeoTherm
LC’s must be engineered by a competent venting
specialist, and could involve the selection of draft
inducing equipment, hardware and controls to
properly balance ue gas pressures. Do not common
vent NeoTherm LC’s unless the vent system
meets this requirement. NeoTherm LC’s are
never permitted to share a vent with Category I
appliances.
3.2.2 Venting Requirements Unique to
Canada
NeoTherm LC boilers and water heaters are Vent
Category IV appliances. Per the requirements of
CAN/CSA-B149.1, only BH vent systems can be
connected to these units and such vent systems,
either ULC S636 certied stainless steel or other
ULC S636 certied BH vent (eg. plastics) must
be installed per the vent manufacturer’s certied
installation instructions.
Page 12
It is the responsibility of the appropriately licensed
technician installing this NeoTherm LC to use
ULC S636 certied vent material consistent with
the requirements as described in the Venting and
Combustion Air section.
Class I venting systems are suitable for gas-red
appliances producing ue gas temperature of more
than 135°C, but not more than 245°C.
Class II venting systems are suitable for gas-red
appliances producing ue gas temperatures of 135°C
or less.
Class II venting systems are further classied into
four temperature ratings as follows:
A Up to and including 65°C
B Up to and including 90°C
C Up to and including 110°C, and
D Up to and including 135°C
LAARS Heating Systems
Flue Gas Sampling Port -
It is also the responsibility of the installer to ensure
that a ue gas sampling port is installed in the
vent system. This ue gas sampling port must be
installed near the ue connection of the NeoTherm
LC: within 2 feet of the ue connection. There is
no ue gas sampling port internal to the NeoTherm
LC, so one must be installed in the vent system
external to the NeoTherm LC. A ue gas sampling
port available as a component of the ULC S636
certied vent system is preferred. However, if one
is not available with the certied vent system, Laars
suggests using a tee with the branch connection
sized to allow for insertion of a ue gas analyzer
probe. The branch connection must be resealable
with a cap or other means to ensure the vent system
remains sealed. (See Fig. 8.)
Consideration must be given to the placement
and orientation of the ue gas sampling port to
ensure that condensate is free to ow back into the
NeoTherm LC and not collect anywhere in the vent
system - including in the ue gas sampling port.
Exhaust Vent Terminal -
An exhaust vent terminal must be installed. If an
exhaust vent terminal is not available with the
certied vent system, Laars suggests the use of a
coupler tting from the certied vent system into
which the vent terminal screen can be installed.
Be sure to install and terminate both vent and
combustion air pipes per the instructions in this
section.
Fig. 8 - Test Port
3.3 Locating the Vent and Combustion
Air Terminals
3.3.1 Side Wall Vent Terminal
The appropriate Laars side wall vent terminal must
be used. The terminal must be located in accordance
with ANSI Z223.1/NFPA 54 and applicable
local codes. In Canada, the installation must be
in accordance with CSA B149.1 or .2 and local
applicable codes.
Consider the following when installing the terminal:
1. Figure 9 shows the requirements for
mechanical vent terminal clearances for the
U.S. and Canada.
2. Vent terminals for condensing appliances or
appliances with condensing vents are not
permitted to terminate above a public walkway,
or over an area where condensate or vapor
could create a nuisance or hazard.
3. Locate the vent terminal so that vent gases
cannot be drawn into air conditioning system
inlets.
4. Locate the vent terminal so that vent gases
cannot enter the building through doors,
windows, gravity inlets or other openings.
Whenever possible, avoid locations under
windows or near doors.
NeoTherm LC Boilers and Water Heaters
U.S. Installations (see note 1) Canadian Installations (see note 2)
A= Clearance above grade, veranda, porch, 12 inches (30 cm) 12 inches (30 cm)
deck, or balcony See note 6 See note 6
B= Clearance to window or door that may be Direct vent only: 12 inches (30 cm); 36 inches (91 cm)
opened Other than Direct vent: 4 ft (1.2m) below or to
side of opening; 1 ft (30 cm) above opening
C= Clearance to permanently closed window See note 4 See note 5
D= Vertical clearance to ventilated soft located
above the terminal within a horizontal See note 4 See note 5
distance of 2 feet (61 cm) from the center
line of the terminal
E= Clearance to unventilated soft See note 4 See note 5
F= Clearance to outside corner See note 4 See note 5
G= Clearance to inside corner See note 4 See note 5
H= Clearance to each side of center line 3 feet (91 cm) within a height 15 feet
extended above meter/regulator assembly See note 4 above the meter/regulator assembly
I= Clearance to service regulator vent outlet See note 4 3 feet (91 cm)
J= Clearance to nonmechanical air supply Direct vent only: 36” (91cm)
inlet to building or the combustion air inlet Other than Direct vent: 4 ft (1.2m) below 36 inches (91 cm)
to any other appliance or to side of opening; 1 ft (30 cm) above opening
K= Clearance to a mechanical air supply inlet 3 feet (91 cm) above if within 10 feet (3 m) 6 feet (1.83 m)
horizontally
L= Clearance above paved sidewalk or paved Vent termination not allowed in this location 7 ft (2.1 m)
driveway located on public property for category IV appliances. See note 5
M= Clearance under veranda, porch, deck, See note 4 12 inches (30 cm)
or balcony See note 5
Notes:
1. In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code.
2. In accordance with the current CAN/CSA-B149 Installation Codes.
3. Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor.
4. For clearances not specied in ANSI Z223.1 / NFPA 54, clearance is in accordance with local installation codes and the
requirements of the gas supplier.
5. For clearances not specied in CAN/CSA-B149, clearance is in accordance with local installation codes and the requirements of the
gas supplier.
6. IMPORTANT: All terminals must be placed so that they remain a minimum 12” above expected snow line. Local codes may have
more specic requirements, and must be consulted.
Page 13
Fig. 9 - Combustion Air and Vent Through Side Wall
*When vent terminal is less than 10 feet (3 m) horizontally
from a forced air inlet, the terminal must be at least 3 feet
(0.9 m) above the air inlet. (US only)
Page 14
IMPORTANT: All terminals must be placed so that they remain at least
12” above the expected snow line. Local codes may have more specific
requirements, and must be consulted. Refer to the NFPA54 National Fuel
Gas Code and your local codes for all required clearances for venting.
Fig. 10 - Multiple Side-Wall Terminals, Air and
Vent
5. Locate the vent terminal so that it cannot
be blocked by snow. The installer may
determine that a vent terminal must be
higher than the minimum shown in codes,
depending upon local conditions.
6. Locate the terminal so the vent exhaust does
not settle on building surfaces or other nearby
objects. Vent products may damage surfaces or
objects.
7. If the boiler or water heater uses ducted
combustion air from an intake terminal located
on the same wall, see Figures 10 and 11 for
proper spacing and orientation.
LAARS Heating Systems
If the vent termination is located in an area exposed
to high winds, an optional PVC tee (the same
diameter as the vent pipe) may be used. The tee’d
vent termination offers greater protection from wind
related operating issues.
3.3.2 Side Wall Combustion Air Terminal
The LAARS side wall combustion air terminal
must be used when the heater takes air from a side
wall. (See Table 3.) Contact Laars for AL29-4C
termination ttings. Consider the following when
installing the terminal. (See Figures 10 and 11).
1. Do not locate the air inlet terminal near a
source of corrosive chemical fumes (e.g.,
cleaning uid, chlorine compounds, etc.).
2. Locate the terminal so that it will not be subject
to damage by accident or vandalism. It must be
at least 7 feet ( 2.1 m) above a public walkway.
3. Locate the combustion air terminal so that it
cannot be blocked by snow. The National Fuel
Gas Code requires that it be at least 12 inches
(30 cm) above grade, but the installer may
determine it should be higher, depending upon
local conditions.
4. If the NeoTherm LC is side-wall vented to the
same wall, locate the vent terminal at least 1
foot (0.3 m) above the combustion air terminal.
5. Multiple vent kits should be installed such that
the horizontal distance between outlet group
and inlet group is 36” (90 cm). (See Figure
10.)
6. The vent outlet must be at least 12” above the
top of the air inlet, and must be at least 36” (90
cm) horizontally from the air inlet. (See Figure
10.)
Fig. 11 - Minimum Venting Distance
NeoTherm LC Boilers and Water Heaters
Page 15
3.3.3 Vertical Vent Terminal
When the unit is vented through the roof, the vent
must extend at least 3 feet (0.9 m) above the point
at which it penetrates the roof. It must extend at
least 2 feet (0.6 m) higher than any portion of a
building within a horizontal distance of 10 feet (3.0
m), and high enough above the roof line to prevent
blockage from snow. The vent terminal offered with
the NeoTherm LC can be used in both vertical and
horizontal applications. When the combustion air is
taken from the roof, the combustion air must terminate
at least 12” (30 cm) below the vent terminal.
3.3.4 Vertical Combustion Air Terminal
When combustion air is taken from the roof, a eld-
supplied rain cap or an elbow arrangement must be
used to prevent entry of rain water. The opening on
the end of the terminal must be at least 12” (30 cm)
above the point at which it penetrates the roof, and
high enough above the roof line to prevent blockage
from snow. When the vent terminates on the roof, the
combustion air must terminate at least 12” (30 cm)
below the vent terminal.
3.3.5 Installations in the Commonwealth
of Massachusetts
In Massachusetts the following items are required
if the side-wall exhaust vent termination is less than
seven (7) feet above nished grade in the area of
the venting, including but not limited to decks and
porches. (From Massachusetts Rules and regulations
248 CMR 5.08.)
1. Installation of Carbon Monoxide Detectors
At the time of installation of the side wall vented
gas fueled appliance, the installing plumber or
gas-tter shall observe that a hard-wired carbon
monoxide detector with an alarm battery back-up
is installed on the oor level where the gas appliance is to be installed. In addition, the installing
plumber or gastter shall observe that a battery
operated or hard-wired carbon monoxide detector with an alarm is installed on each additional
level of the dwelling, building or structure served
by the side-wall horizontally vented gas fueled
equipment. It shall be the responsibility of the
property owner to secure the services of qualied
licensed professionals for installation of hardwired carbon monoxide detectors.
a. In the event that the side-wall horizontally
vented gas fueled equipment is installed in a
crawl space or an attic, the hard-wired carbon
monoxide with alarm and battery back-up may
be installed on the next adjacent oor level.
b. In the event that the requirements of the sub-
division cannot be met at the time of completion
of installation, the owner shall have a period of
thirty (30) days to comply with the above requirements, provided, however, that during said
thirty (30) day period, a battery operated carbon
monoxide detector with an alarm be installed.
2. Approved Carbon Monoxide Detectors
Each carbon monoxide detector shall comply
with NFPA 720 and be ANSI/UL 2034 listed
and IAS certied.
3. Signage
A metal or plastic identication plate shall be
permanently mounted to the exterior of the
building at a minimum height of eight (8) feet
above grade directly in line with the exhaust
vent terminal for horizontally vented gas fueled
heating appliance or equipment. The sign shall
read, in print no less than one-half (1/2) inch in
size: “GAS VENT DIRECTLY BELOW, KEEP
CLEAR OF ALL OBSTRUCTIONS.”
4. Inspection
The state or local gas inspector of the side-wall
horizontally vented gas fueled appliance shall
not approve the installation unless, upon inspection, the inspector observes carbon monoxide
detectors and signage installed in accordance
with the provisions of 248 CMR 5.08(2)(a) 1-4.
3.4 Common Vent Test
Note -This section does not describe a method
for common venting NeoTherm LC’s. It describes
what must be done when a unit is removed from
a common vent system. NeoTherm LC’s require
special vent systems and fans for common vent.
Contact the factory if you have questions about
common venting NeoTherm LC’s.
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.
Page 16
LAARS Heating Systems
3. As much as possible, close all building doors
and windows. Also close 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 any clothes dryers or other appliances not
connected to the common venting system.
Turn on any exhaust fans, such as range hoods
and bathroom exhausts, so they will operate
at maximum speed. Do not operate a summer
exhaust fan. Close any replace dampers.
4. Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust the
thermostat so the appliance will operate
continuously.
5. Test for spillage at the draft hood relief opening
after ve minutes of main burner operation. Use
the ame of a match or candle, or smoke from a
cigarette, cigar or pipe.
6. After it has been determined that each appliance
remaining connected to the common venting
system properly vents when tested as outlined
above, return the doors, windows, exhaust fans,
replace dampers and any other gas burning
appliances to their previous conditions of use.
7. Any improper operation of the common venting
system should be corrected so that the installation conforms to the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 and/or CSA B149.1,
Installation Codes. When resizing any portion
of the common venting system, the common
venting system should be resized to approach the
minimum size as determined using the appropriate tables and guidelines in the National Fuel
Gas Code, ANSI Z223.1 NFPA 54 and/or CSA
B149.1, Installation Codes.
3.6 Condensate Drain Trap
A condensate drain trap is included with the
NeoTherm LC and is designed to drain the boiler of
condensate. The vent condensate should be drained
through a drain tee located in the vent line. This will
help prevent excessive condensate from entering
the boiler condensate trap and preventing the boiler
from operating.
Connect a 3/4” PVC pipe between the drain
connection and a oor drain (or condensate pump if
a oor drain is not accessible).
The condensate drain must be installed to prevent
the accumulation of condensate. When a condensate
pump is not used, the tubing must continuously
slope downward toward the drain with no spiraling.
Consult local codes for the disposal method.
Caution
Condensate is mildly acidic (pH=5), and may
harm some oor drains and/or pipes, particularly
those that are metal. Ensure that the drain,
drainpipe, and anything that will come in
contact with the condensate can withstand the
acidity, or neutralize the condensate before
disposal. Damage caused by failure to
install a neutralizer kit or to adequately treat
condensate will not be the manufacturer’s
responsibility.
3.5 Outdoor Installation
The NeoTherm LC may only be installed outdoors
in applications where the outdoor temperature
doesn’t drop below freezing. For proper operation
in outdoor installations, the boiler must be equipped
with the inlet air and exhaust terminal kits listed in
Table 3C. The bottom panel cover plate must be
removed. Additional instructions are supplied with
the terminal kits.
NeoTherm LC Boilers and Water Heaters
Section 4
GAS SUPPLY AND PIPING
4.1 Gas Supply and Piping
Gas piping should be supported by suitable hangers
or oor stands, not the appliance.
Installers should refer to local building and safety
codes or, in the absence of such requirements, follow
the National Fuel Gas Code, ANSI Z223.1 NFPA 54
and/or CSA B149.1, Installation Codes.
Review the following instructions before proceeding
with the installation.
1. Verify that the appliance is tted for the
proper type of gas by checking the rating
plate. NeoTherm LC will function properly
without the use of high altitude modication at
elevations up to 10,000 feet (3050 m).
2. The maximum inlet gas pressure must not
exceed 13” W.C. (3.2 kPa). The minimum inlet
gas pressure is 4” W.C. (1.0 kPa).
3. Refer to Tables 6A, 6B, 6C and 6D to size the
piping.
4. Run the gas supply line in accordance with all
applicable codes.
5. Locate and install manual shutoff valves in
accordance with state and local requirements.
6. A sediment trap must be provided upstream of
the gas controls.
7. All threaded joints should be coated with
piping compound resistant to the action of
liqueed petroleum gas.
8. The appliance and its individual shutoff valve
must be disconnected from the gas supply
piping during any pressure testing of that
system at test pressures in excess of 1/2 PSIG
(3.45 kPa).
9. The unit must be isolated from the gas supply
system by closing its individual manual shutoff
valve during any pressure testing of the gas
supply piping system at test pressures equal to
or less than 1/2 PSIG (3.45 kPa).
10. The appliance and its gas connection must be
leak tested before placing it in operation.
11. Purge all air from gas lines.
Page 17
WARNING
Open ame can cause gas to ignite and result in
property damage, severe injury, or loss of life.
Note - The NeoTherm LC appliance and all other
gas appliances sharing the gas supply line must
be ring at maximum capacity to properly measure
the inlet supply pressure. The pressure can be
measured at the supply pressure port on the gas
valve. Low gas pressure could be an indication of
an undersized gas meter, undersized gas supply
lines and/or an obstructed gas supply line. Some
NeoTherm LC’s are equipped with low and high gas
pressure switches that are integrally vent limited.
These types of devices do not require venting to
atmosphere.
Page 18
LAARS Heating Systems
NeoTherm LC
NATURAL GAS
REQUIRED
CU FT
SIZE / HR.
1000 1000
1700 1700
TO SIZE PIPING:
Measure linear distance from meter outlet
to last boiler. Add total input of all boilers
and divide by 1000 to obtain cu ft / hr
required. Add total equivalent length of
ttings used according to Table 6B. Align
total length (pipe and ttings) on left side
column of Table 6C with highest cubic feet
of gas required.
Notes:
Consult and conrm with Applicable Fuel
Gas Code before beginning work.
Verify gas inlet pressure is between 4 and
13 in W.C. before starting boiler.
Table 6A - Natural Gas Requirements
EQUIVALENT LENGTHS OF STRAIGHT PIPE FOR TYPICAL
FITTING 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
90° ELBOW 3.6 4.4 5.2 6.6 7.4 8.5
TEE 4.2 5.3 6.6 8.7 9.9 12
SCH 40 FITTINGS
NOMINAL PIPE SIZE
LINEAR FEET
Table 6B - Equivalent Pipe Lengths
SCH 40 METAL PIPE CAPACITY FOR 0.60 SPECIFIC GRAVITY
NATURAL GAS
NOMINAL PIPE SIZE @ 0.30” W.C. PRESSURE DROP
LENGTH 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
FT CUBIC FEET OF GAS PER HOUR
20 92 190 350 730 1100 2100
40 130 245 500 760 1450
60 105 195 400 610 1150
80 90 170 350 530 990
100 150 305 460 870
Table 6C - Pipe Capacity for Natural Gas
SCHED 40 METAL PIPE CAPACITY FOR 1.50 SPECIFIC
GRAVITY UNDILUTED PROPANE
NOMINAL PIPE SIZE @ 11” W.C. INLET AND 0.5” W.C.
PRESSURE DROP
SIZE 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
LENGTH MAXIMUM CAPACITY IN THOUSANDS OF BTU PER
HOUR
20 200 418 787 1616 2422 4664
40 137 287 541 1111 1664 3205
60 110 231 434 892 1337 2574
80 94 197 372 763 1144 2203
100 84 175 330 677 1014 1952
Notes:
1. Follow all local and national LP gas codes for line sizing and
equipment requirements.
2. Verify that inlet gas pressure remains between 4 and 13 inches
of water column before and during operation.
Source: ANSI Z223.1-80 National Fuel Gas Code.
Table 6D - Pipe Capacity for Propane
NeoTherm LC Boilers and Water Heaters
Section 5
PUMP REQUIREMENTS
5.1 NeoTherm LC Boiler Flow and Head Requirements
Temperature Rise in °F
20°F 25°F 30°F 35°F 40°F 45°F
Model
1,000 95 30 75 20 62 15 54 11 48 9 42 7
1,700 161 41 129 27 107 19 92 14 81 11 72 9
Model
1,000 359 9.0 283 6.0 234 4.5 204 3.3 182 2.7 159 2.1
1,700 609 12.3 488 8.1 405 5.7 348 4.3 306 3.3 272 2.7
Flow
GPM
Flow
LPM
H/L-Ft Flow
GPM
11.0°C 13.7°C 16.5°C 19.3°C 22.0°C 24.7°C
H/L-m Flow
LPM
H/L-Ft Flow
GPM
Temperature Rise in °C
H/L-m Flow
LPM
H/L-Ft Flow
GPM
H/L-m Flow
LPM
H/L-FtFlow
GPM
H/L-m Flow
LPM
H/L-FtFlow
GPM
H/L-m Flow
LPM
Table 7 - Water Flow Requirements
Page 19
H/L-Ft
H/L-m
5.2 NeoTherm LC Water Heater Flow and Head Requirements
Temperature Rise
20°F 11.0°C
Model
1,000 95 30 359 9.0
1,700 161 41 609 12.3
Notes Figures listed are for soft/normal water.
Maximum hardness of 10 grains per gallon allowed.
Flow GPM H/L-Ft Flow LPM H/L-m
Table 8 - NeoTherm LC Water Heater Flow Data
Page 20
Section 6 WATER CONNECTIONS
LAARS Heating Systems
Section 6 is divided into TWO parts.
Section 6A covers NTH units designed
for hydronic heating. Many installations
include indirect domestic hot water.
Section 6B covers NTV models, which are
designed exclusively for “volume water”
domestic hot water applications. Refer
to the proper section for instructions on
installing and piping your product. Refer
to Table 9 for the connection pipe sizes
required.
Section 6A - NTH Systems
6A.1 NTH System Piping:
Hot Supply Connections
Note -This appliance must be installed in a closed
pressure system with a minimum of 12 psi (82.7
kPa) static pressure at the boiler.
The hot water piping should be supported by suitable
hangers or oor stands. Do not support the piping
with this appliance. The hangers used should allow
for expansion and contraction of copper pipe. Rigid
hangers may transmit noise through the system
resulting from the piping sliding in the hangers. We
recommend that padding be used when rigid hangers
are installed. Maintain 1” (2.5 cm) clearance to
combustibles for all hot water pipes.
Pipe the discharge of the relief valve (full size) to a
drain or in a manner to prevent injury in the event
of pressure relief. Install an air purger, an air vent,
a diaphragm-type expansion tank, a hydronic ow
check in the system supply loop, and any other
devices required by local codes. The minimum ll
pressure must be 12 psig (82.7 kPa). Install shutoff
valves where required by code.
Suggested piping diagrams are shown in Figures
12 through 16. These diagrams are meant only as
guides. Components required by local codes must be
properly installed.
The NeoTherm LC’s efciency is higher with
lower return water temperatures. Therefore, to
get the best low return temperature with multiple
boilers, pipe as shown in Figures 15 and 16.
6A.2 NTH Cold Water Make-Up
1. Connect the cold water supply to the inlet
connection of an automatic ll valve.
2. Install a suitable back ow preventer between
the automatic ll valve and the cold water
supply.
3. Install shut off valves where required.
In some installations, a hot water heating boiler is
connected to heating coils located in an air handling
appliance where the coils may be exposed to
refrigerated air circulation. In these cases, the boiler
piping system must be equipped with ow control
valves or other automatic means to prevent gravity
circulation of the boiler water during the cooling
cycle.
A boiler installed above radiation level, or as
required by the authority having jurisdiction,
must be provided with a low water cutoff device
either as a part of the boiler or at the time of boiler
installation.
NTH PIPE SIZE, NTV PIPE SIZE,
SIZE INCHES SIZE INCHES
1000 2 1000 2
1700 2.5 1700 2.5
Table 9 - Water Connection Pipe Sizes
NeoTherm LC Boilers and Water Heaters
Page 21
6A.3 NTH Freeze Protection
WARNING
Glycol must not be used in domestic hot water
applications. Refer to Section 6B.4 for instructions
on freeze protection for NTV units (domestic hot
water).
NeoTherm LC’s may be installed indoors or
outdoors. If installed outdoors, the NTH unit
must never be installed in a location which may
experience freezing temperatures. If installed
indoors, and there is an event such as a power
outage, interruption of gas supply, failure of system
components, activation of safety devices, etc., this
may prevent a boiler from ring. Any time a boiler
is subjected to freezing conditions, and the boiler
is not able to re, and/or the water is not able to
circulate, there is a risk of freezing in the boiler
or in the pipes in the system. When water freezes,
it expands. This may result in bursting of pipes, or
damage to the boiler, and this could result in leaking
or ooding conditions.
Do not use automotive antifreeze. To help prevent
freezing, Laars recommends the use of inhibited
glycol concentrations between 20% and 35% glycol.
Typically, this concentration will serve as burst
protection for temperatures down to approximately
-5°F (-20°C). If temperatures are expected to be
lower than -5°F (-20°C), glycol concentrations up
to 50% can be used. When concentrations greater
than 35% are used, water ow rates must be
increased to maintain a 20°F to 25°F temperature
rise through the boiler.
Different glycol products may provide varying
degrees of protection. Glycol products must
be maintained properly in a heating system, or
they may become ineffective. Consult the glycol
specications, or the glycol manufacturer, for
information about specic products, maintenance
of solutions, and set up according to your particular
conditions.
The following manufacturers offer glycols,
inhibitors, and anti foamants that are suitable
for use in the NeoTherm LC. Please refer to the
manufacturers instructions for proper selection and
application.
6A.4 NTH Suggested Piping Schematics
Figures 12 through 16 (the next several pages) show
suggested piping congurations for NTH boilers.
These diagrams are only meant as guides. All
components or piping required by local code must
be installed.
6A.5 Condensate Drain Trap
A condensate drain trap is included with the
NeoTherm LC and is designed to drain the boiler
of condensate. The vent condensate should be
drained through a drain tee located in the vent line.
This will help prevent excessive condensate from
entering the boiler condensate trap and preventing
the boiler from operating.
Connect a 3/4” PVC pipe between the drain
connection and a oor drain (or condensate pump if
a oor drain is not accessible).
The condensate drain must be installed to prevent
the accumulation of condensate. When a condensate
pump is not used, the tubing must continuously
slope downward toward the drain with no spiraling.
Consult local codes for the disposal method.
Caution
Condensate is mildly acidic (pH=5), and may
harm some oor drains and/or pipes, particularly
those that are metal. Ensure that the drain,
drainpipe, and anything that will come in
contact with the condensate can withstand the
acidity, or neutralize the condensate before
disposal. Damage caused by failure to
install a neutralizer kit or to adequately treat
condensate will not be the manufacturer’s
responsibility.
• Sentinel Performance Solutions Group
• Hercules Chemical Company
• Dow Chemical Company
Page 22
Space heating zone circuit
Space heating zone circuits
LAARS Heating Systems
Low temp. radiant zone
Air vent
Water feed
controls
4 pipe dia. max.
System pump
4 pipe dia. max. 4 pipe dia. max. 4 pipe dia. max.
Note This drawing is a schematic
representation of a piping style,
and is not intended to be used
as a working installation drawing.
Local code requirements
must be met.
Fig. 12 - Hydronic Piping — Single Boiler, Multiple Temperature Zones
Zoning with circulators
NeoTherm LC Boilers and Water Heaters
Page 23
Air vent
Water feed
controls
Expansion tank
Note This drawing is a schematic
representation of a piping style,
and is not intended to be used
as a working installation drawing.
Local code requirements
must be met.
4 pipe dia. max.
4 pipe
dia. max.
Anti-scald
mixing valve
Domestic
hot water
out
Indirect DHW tank
Cold
water
Fig. 13 - Hydronic Piping — Single Boiler, Zoning with Circulators, Indirect DHW Tank with Zone Pumps
Indirect tank directly off of boiler
Page 24
Note This drawing is a schematic
representation of a piping style,
and is not intended to be used
as a working installation drawing.
Local code requirements
must be met.
LAARS Heating Systems
Air vent
Expansion tank
4 pipe dia. max.
Low temp. radiant zone
Water feed controls
Indirect DHW tank
Low temp. radiant zone
Anti-scald
mixing
valve
Domestic
hot water
out
Cold water
Fig. 14 - Hydronic Piping — Single Boiler with Low Temperature Zones and Indirect DHW Tank
Indirect tank directly off of boiler
NeoTherm LC Boilers and Water Heaters
Page 25
Note This drawing is a schematic
representation of a piping style,
and is not intended to be used
as a working installation drawing.
Local code requirements
must be met.
Space heating zone circuit
Air vent
Water feed controls
Expansion tank
4 pipe dia. max.
Space heating
zone circuits
Low temp. radiant zone
4 pipe dia. max. 4 pipe dia. max.
Common piping must be sized for the
combined water flow of all of the boilers.
Fig. 15 - Hydronic Piping — Multiple Boilers, Multiple Temperature Zones, Reverse Return
Zoning with circulators
Page 26
Space heating zone circuit
Air vent
Space heating zone circuits
High temp. space heating zone circuit
LAARS Heating Systems
Water feed
controls
Expansion tank
4 pipe dia. max.
Common piping must be sized for the
combined water flow of all the boilers.
Note This drawing is a schematic
representation of a piping style,
and is not intended to be used
as a working installation drawing.
Local code requirements
must be met.
4 pipe dia. max. 4 pipe dia. max.
Note Indirect pump
must be sized
for boiler and
indirect
Indirect
DHW tank
Anti-scald
mixing valve
Domestic
hot water
out
Cold
water
Note In this piping arrangement,
the boiler pump must turn off
during DHW operation.
Fig. 16 - Hydronic Piping — Multiple Boilers, Indirect DHW Off of One Boiler
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