Laars NTH1000 User manual

Installation and Operation Instructions Document 1255B
H2352900B
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 qualied installer, service agency, or gas
supplier.
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualied 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.
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 inammables 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 qualié ou
par le fournisseur de gaz.
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

NeoTherm LC Boilers and Water Heaters
Section 1
GENERAL INFORMATION....................................... 1
1.1 Introduction............................................... 1
1.2 About the Touch Screen ........................... 1
1.3 Safety Notes ............................................. 3
1.4 ModelIdentication/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
  fromOutsideWallorRoofTermination ..... 8
Section 3
VENTING AND COMBUSTION AIR......................... 9
3.1 CombustionAir ......................................... 9
 3.1.1 CombustionAirFromRoom ..................... 9
 3.1.2 DuctedCombustionAir........................... 10
3.2 Venting.....................................................11
 3.2.1 CommonVenting .....................................11
 3.2.3 VentingRequirementsUniquetoCanada11
3.3 LocatingtheVentandCombustionAir
  Terminals ................................................ 12
 3.3.1 SideWallVentTerminal .......................... 12
 3.3.2 SideWallCombustionAirTerminal......... 14
 3.3.3 VerticalVentTerminal ............................. 15
 3.3.4 VerticalCombustionAirTerminal ............ 15
 3.3.5 InstallationsintheCommonwealthof
Massachusetts........................................ 15
3.4 CommonVentTest ................................. 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 NeoThermLCBoilerFlowandHead
  Requirements ......................................... 20
5.2 NeoThermLCWaterHeaterFlowand ......
  HeadRequirements................................ 19
Section 6
WATER CONNECTIONS ....................................... 20
Section 6A - NTH Systems..................................... 20
6A.1 NTHSystemPiping:HotSupply
Connections............................................ 20
6A.2 NTH Cold Water Make-Up...................... 20
6A.3 NTH Freeze Protection........................... 21
6A.4 NTHSuggestedPipingSchematics ....... 21
6A.5 Condensate Trap .................................... 21
Section 6B - NTV Systems..................................... 27
6B.1 NTV Water Quality.................................. 27
6B.2 NTVPipingRequirements ...................... 27
6B.3 NTV Cold Water Make-Up ...................... 28
6B.4 NTV Freeze Protection ........................... 28
6B.5 NTVSuggestedPipingSchematics........ 28
6B.6 NTVSuggestedPumps .......................... 29
6B.7 Condensate Trap .................................... 29
Section 7
ELECTRICAL CONNECTIONS.............................. 30
7.1 Main Power............................................. 30
7.2 PumpConnections ................................. 30
7.3 24VACTransformerwithIntegral
Circuit Breaker........................................ 32
7.4 Signal Connections................................. 32
7.5 Optional Field Connections .................... 32
7.6 LadderDiagrams .................................... 33
  WiringDiagrams ..................................... 34
Section 8
USING THE TOUCH SCREEN AND GAUGES...... 36
8.1 The Touch Screen and Gauges on the Front
  oftheNeoThermLC ............................... 36
8.2 Using the Touch Screen.......................... 36
8.3 WhileOperating–CheckingLead/Lag
  OperatingInformation............................. 38
8.4 CheckingLead/LagMaster..................... 38
8.5 While Operating - Checking Individual
  Parameters ............................................. 39
8.6 Checking Individual Details .................... 40
8.7 ConguringParametersonIndividual
Controllers .............................................. 40
8.8 VericationProcessforSafety-Related
  Parameters ............................................. 41
Table of Contents
i

LAARS Heating Systems
Section 9 –
SETUP AND CONFIGURATION ............................ 44
9.1 ReviewofLead/LagControlSystem ...... 44
 9.1.1 AboutLead/LagOperation ..................... 44
 9.1.2 Lead/LagModulationCycle .................... 45
 9.1.3 NTHLead/LagwithIndirect
  DomesticHotWater................................ 46
9.2 ConnectionTerminals ............................. 46
9.3 NeoThermLCSystemCongurations .. 46-54
9.4 Installation Jobs...................................... 55
 A NoteforSystemsUsingCommon
Venting.................................................... 55
 B NamingtheControllers........................... 55
 C MakeOneControltheLead/Lag
Master..................................................... 56
 D DisabletheLead/LagMasterFunction
  ontheLead/LagSlaves.......................... 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 SettheParametersUsedbythe
  Lead/LagSystem.................................... 64
  Aboutthe“TimeofDay”Function........... 68
 J InstalltheSystemSensorandAdjust
the Setpoint ............................................ 68
 K SettheLead/LagOutdoorResetand
  WarmWeatherShutdown....................... 68
  About“OutdoorReset” ........................... 69
 L BuildingAutomationorMultipleBoiler
  ControlThermostatDemand ................. 70
 M BuildingAutomationorMultipleBoiler
  4-20mASetpointControl ....................... 70
 N BuildingAutomationorMultipleBoiler
  4-20mAModulationControl .................... 71
 O CombustionSetupProcedure ................ 71
 P SettingtheDateandTimeonthe
  SystemDisplay....................................... 76
9.5 SetupforDomesticHotWaterona
  Lead/LagSystem.................................... 77
Setup Type 1 ........................................... 77
Setup Type 2 ........................................... 78
Setup Type 3 ........................................... 79
9.6 Gateway Connections to a
  BuildingAutomationSystem................... 80
9.7 Setup for High Altitude Operation -
NT 1700 Only.......................................... 80
9.8 InstallerParameters .......................... 81-87
Section 10 -
INITIAL STARTUP INSTRUCTIONS ...................... 88
10.1 FillingtheBoilerSystem ......................... 88
10.2 Initial Operation ...................................... 89
10.2.1 Initial Burner Operation........................... 89
 10.2.2 CombustionSetupProcedure ................ 89
10.3 ShuttingDowntheNeoThermLC........... 89
10.4 RestartingtheNeoThermLC.................. 89
Section 11
MAINTENANCE ..................................................... 90
11.1 SystemMaintenance .............................. 90
11.2 Maintenance Notes................................. 90
11.2.1 Burner ..................................................... 90
 11.2.2 ModulatingGasValve/Venturi................ 90
11.2.3 Controllers .............................................. 91
 11.2.4 IgnitorAssembly ..................................... 91
 11.2.5 FlameSensor ......................................... 91
 11.2.6 TransformerwithIntegral
Circuit Breaker........................................ 91
11.2.7 Blower..................................................... 92
11.2.8 Heat Exchanger Coils ............................. 92
11.2.9 Gas Pressure Switches (optional) .......... 92
11.2.10Natural/PropaneGasConversion......... 93
11.2.11 Condensate Trap .................................. 93
 11.2.12 Battery(Date&TimeBack-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 DiagnosticTestsandInput/Output
Indicators ...............................................113
12.5 Lead/LagSlaveDiagnostics ..................114
12.6 Statistics ................................................114
12.7 Analysis .................................................114
12.8 Control Snapshot...................................115
12.9 Operating Sequence..............................115
Section 13
REPLACEMENT PARTS.......................................118
13.1 GeneralInformation...............................118
13.2 Parts List................................................118
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.
Pressure and
temperature
gauge
Touch Screen Display
(behind the plastic cover
which slides downward)
Power switch
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 modications to the boiler,
its gas controls, or wiring may void the warranty.
If eld conditions require modications, consult
the factory representative before initiating such
modications.
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 .
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.
Primary
burner
Primary
controller
Gas
valve
Gas
valve
Secondary
controller
Secondary
burner
Touch
Screen
Boiler 1
Fig. 1 – Control Arrangement in a Single-Boiler
Installation

LAARS Heating Systems
Page 2
• 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
Slave 4
Boiler 2
Slave 3
Slave 2
Lead Lag
Master and
Slave 1 Slave 6
Boiler 3
Slave 5
Slave 8
Boiler 4
Slave 7
Addr
1
Addr
2
Addr
3
Addr
4
Addr
5
Addr
6
Addr
7
Addr
8
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.”
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
Congure button. This will take you to all of
the conguration options for that individual
controller/burner.
Press here to
see current
Lead/ Lag
performance
Press here
for individual
controller/
burner pairs
Press here
for Lead/ Lag
setup
Press here for
system 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:
• 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 Conguration”
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.
1.3 Safety Notes
WARNING
Fire or Explosion Hazard
Improper conguration can cause fuel buildup and
explosion. Improper user operation may result in
property loss, severe physical injury, or death.
Any changes to safety-related conguration
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
requirements take precedence over the general
instructions contained herein.
WARNING
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.
WARNING
Electrical Shock Hazard
Electrical shock can cause severe injury, death or
property damage. Disconnect the power supply
before beginning installation or changing the
wiring to prevent electrical shock or damage to the
equipment. It may be necessary to turn off more than
one power supply disconnect.
All electrical wiring is to be done in accordance with
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.
1.4 ModelIdentication
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
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
FUEL
N - NATURAL
P - PROPANE
OPTIONS CODE
J- CSD1
X - STANDARD
PUMP OPTIONS
X - NO PUMP
REVISION
1 - FIRST
7

LAARS Heating Systems
Page 4
1.6 Appliance Overview
Pressure and
temperature
gauge
Blower 1
(under bezel)
Automatic
gas valves
Manual
gas valve
Blower 2
Touchscreen
Protective Cover
(slides downward)
Power switch Ducted air inlet
Electrical box
PRV and
ow switch
Outlet
temperature
sensors
Inlet
temperature
sensors
Condensate
trap
Leveling feet
Model 1000
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
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.
*

NeoTherm Boilers and Water Heaters
Page 5
Model 1700
Pressure and
temperature
gauge
Blower 1
(behind bezel)
Automatic
gas valves
Manual
gas valve
(on back)
Blower 2
Touchscreen
Protective Cover
(slides downward)
Power switch Ducted air inlet Electrical box
PRV and
ow switch
Outlet
temperature
sensors
Inlet
temperature
sensors
Condensate
trap
Leveling feet
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.
*
*

LAARS Heating Systems
Page 6
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).