Bradford White Laars NEOTHERM NTH Series Owner's manual

Installation and Operation Instructions Document 1330E
H2374100E
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
®
with Touchscreen Display
Modulating Boilers and
Volume Water Heaters
Indoor models
NTH Sizes 285 – 850 MBTU/h
NTV Sizes 150 – 850 MBTU/h
Outdoor models
NTH & NTV Sizes 150 – 850 MBTU/h

LAARS Heating Systems
SECTION 1
General Information
1.A Introduction.......................................................1
1.B Warranty...........................................................1
1.C ModelIdentication...........................................1
1.D Safety ...............................................................2
1.E Appliance Overview.......................................4-9
1.F Dimensions, Indoor Models............................10
1.G Dimensions, Outdoor Models.........................12
1.H The Installation Kit..........................................14
SECTION 2
Locating the Appliance
2.A General Information........................................16
2.B Locating Appliance for Correct Vent Distance
from Outside Wall or Roof Termination...........16
SECTION 3
Venting and Combustion Air
3.A General Venting..............................................17
3.B Combustion Air...............................................17
3.C Venting............................................................19
3.D Locating Vent & Combustion Air Terminals.....21
3.E Common Vent Test.........................................25
SECTION 4
Gas Supply and Piping......................................26
SECTION 5
Pump Requirements
5.A Boiler Flow and
Head Requirements........................................27
5.B Water Heater
Flow and Head Requirements........................27
SECTION 6A
Water Connections - Boiler
6A.1 Boiler System Piping: Hot Supply
Connections....................................................28
6A.2 Boiler Cold Water Make-Up............................28
6A.3 Condensate Drain...........................................29
6A.4 Freeze Protection...........................................29
6A.5 Boiler Suggested Piping Schematics.........29-35
6A.6 Recognized Chemicals...................................29
SECTION 6B
Water Connections - Water Heater
6B.1 Heater Water Quality......................................36
6B.2 Piping Requirements......................................36
6B.3 Cold Water Make-Up......................................36
6B.4 Condensate Drain...........................................37
6B.5 Freeze Protection...........................................37
6B.6 Heater Suggested Piping Schematics............37
6B.7 Heater Suggested Pumps ..............................37
SECTION 7
Electrical and Wiring Diagrams
7.A Installation Warnings.......................................39
7B Main Power Connections................................39
7.B,1 Pump Connections and Operation..................39
7.B.2 Optional VARI-PRIMETM .................................39
7.C Hydronic Heating Using External Mod............41
7.D Optional Field Connections.............................41
7.E Lead Lag Connections....................................42
7.F Building Automation Systems Connections ....43
7.G System Wiring Diagram..................................44
7.H Ladder Diagram..............................................45
Table of Contents
i

NEOTHERM Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
ii
SECTION 9
First Start Up and Adjustment
9.A Filling the Boiler System.................................71
9.B First Operation................................................71
9.C Shutting Down the NeoTherm Unit.................72
9.D Restarting the NeoTherm Unit........................72
SECTION 10
Maintenance
10.A System Maintenance......................................73
10.B Appliance Maintenance and Component
Description......................................................73
10.C Battery Back Up for Date and Time................76
10.D Gas Conversion..............................................76
SECTION 11
Troubleshooting
11.A About Lockouts, Holds, and Alerts...................78
11.A.1 Responding to a Lockout, Hold, or Alert......78
11.A.2 Viewing the Lockout andAlert Histories.......78
11.B Troubleshooting Table.................................80-87
11.C Diagnostic Tests and Input/Output Indicators ..88
11.D Lead Lag Follower Diagnostics........................89
11.E Statistics...........................................................89
11.F Analysis............................................................89
11.G Control Snapshot.............................................89
11.H Operating Sequence........................................90
SECTION 12
Replacement Parts
12.A General Information.......................................91
12.B Parts List...................................................91-93
12.C Parts Illustrations....................................93-100
SECTION 8
Using the Touch Screen
8.A The Touch Screen ........................................47
8.B Using the Touch Screen ................................47
8.C Login (required for some parameters)...........48
8.D VericationProcessforSafety-Related
Parameters....................................................49
8.E Checking Individual Parameters....................50
8.F Setting the Date and Time..............................51
8.G The Conguration Menu ............................52
TheCongurationSub-Menus(ALL18) .......53
8.G.1 SystemIdentication&Access...................53
8.G.2ACH-CentralHeatConguration...............53
2B Setting Up 4-20 mA Set Point..................53
8.G.3 OutdoorResetConguration......................54
8.G.4 DHW-DomesticHotWaterConguration .54
8.G.5 WarmWeatherShutdownConguration ....54
8.G.6 DemandPriorityConguration ...................55
8.G.7 ModulationConguration............................55
8.G.8 Pump Connections .....................................55
8.G.9 StatisticsConguration...............................56
8.G.10 High Limits................................................56
8.G.11Stack Limits ................................................56
8.G.12 Anti-CondensationConguration..............56
8.G.13 FrostProtectionConguration ..................56
8.G.14 SystemConguration ...............................56
8.G.15 FanConguration .....................................57
8.G.16 SensorConguration ................................57
About Lead Lag
..............................................58
8.G.17LeadLagFollowerConguration..............60
8.G.18LeadLagLeaderConguration ................62
8.H Congurefora
Building Automation System..........................65
8.I Combustion Setup ...................................66
8.J Adjusting CO2 ...............................................68

LAARS Heating Systems

Page 1
NEOTHERM Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
SECTION 1
GENERAL INFORMATION
Consult the Rating Plate on the side of the unit. The
following information describes the model nomenclature
(number structure).
(1-2) Model Series Designation
N T = NeoTherm
(3) Usage
H = Hydronic
V = Volume Water
(4-6) Size
1 5 0 = 150,000 BTU/hr input
1 9 9 = 199,000 BTU/hr input, Heateronly
2 1 0 = 210,000 BTU/hr input, Boiler only
2 8 5 = 285,000 BTU/hr input
3 9 9 = 399,000 BTU/hr input
5 0 0 = 500,000 BTU/hr input
6 0 0 = 600,000 BTU/hr input
7 5 0 = 750,000 BTU/hr input
8 5 0 = 850,000 BTU/hr input
(7) Fuel
N = Natural Gas
P = LP Gas
(8) Options Code
X = Standard Unit
J = CSD-1, FM, GAP, IL Code (size 500-850 only)
C - STANDARD (Canada)
D - CSD-1 (Canada)
E - OUTDOOR
F - OUTDOOR (Canada)
G - CSD-1, OUTDOOR
H - CSD-1, OUTDOOR (Canada)
(9) Pump Options
N = Pump included (150-500 only)
X = No pump (conguration available for all sizes)
W = HLW w/ Pump (option for Heater only)
L = HLW w/out Pump (option for Heater only)
(10) Revision
3 = Third version
Model Nomenclature
1 2 3 4 5 6 7 8 9 10 11
SERIES
N T USAGE
H - HYDRONIC
V - VOLUME
WATER
SIZE
MBTU/h
1 5 0
1 9 9
2 1 0
2 8 5
3 9 9
5 0 0
6 0 0
7 5 0
8 5 0
FUEL
N - NATURAL
P - PROPANE
OPTIONS CODE
X - STANDARD
J - CSD-1, FM, GAP,
IL (500-850 only)
C - STANDARD (Canada)
D - CSD-1 (Canada)
E - OUTDOOR
F - OUTDOOR (Canada)
G - CSD-1, OUTDOOR
H - CSD-1, OUTDOOR
(Canada)
PUMP OPTIONS
N - PUMP INCL.
(150-500 only)
X - NO PUMP
W -HLW w/PUMP
(opt for Heater only)
L - HLW w/out
PUMP
(opt for Heater only)
REVISION
3 - THIRD
3N T
NOTE: Throughout the content of this manual,
the NeoTherm will be referred to as a ‘unit’.
NeoTherm = unit
LAARS Heating Systems NeoTherms are covered by a
limited warranty. The owner should complete the warranty
registration at 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), installation date, and
name of the installer. Shipping costs are not included in
the warranty coverage.
1.A Introduction
This manual provides information necessary for the
installation, operation, and maintenance of LAARS
Heating Systems NeoTherm boilers and water heaters.
Read it carefully before starting the installation.
All application and installation procedures should
be reviewed completely before proceeding with the
installation. Consult the LAARS Heating Systems
factory, or local factory representative, with any
problems or questions regarding this equipment.
Experience has shown that most operating problems
are caused by improper installation.
NeoTherm is protected against over pressurization. A
pressure relief valve is included with each NeoTherm.
Some NeoTherms may require that the PRV be
installed prior to lling the system. Refer to Figures 2-9
for PRV locations.
1.B Warranty
1.C Model Identication

Page 2
LAARS Heating Systems
WARNING:
As required by the State of California Proposition 65.
www.P65Warnings.ca.gov
Cancer and Reproductive Harm
1.D Safety Notes
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
These units must be installed in accordance with
the procedures detailed in this manual, or the
Manufacturer’s 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 these units 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.
NOTE: 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” or in Canada reference the B149.1 latest
edition and with the requirement of the local utility or
other authorities having jurisdiction. Such applicable
requirements take precedence over the general
instructions contained herein.All electrical wiring is to
be done in accordance with the 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.
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).
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 shuto󰀨 valve. Do not shut o󰀨 the power
switch. Contact your heating contractor, gas company,
or factory representative.
Note: The unit is protected against over-pressurization.
A pressure relief valve is included with each unit.
DANGER
The inlet gas pressure to the appliance must not
exceed 13” W.C. (3.2kPa).

Page 3
NEOTHERM Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
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 o󰀨 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.

Page 4
LAARS Heating Systems
Figure 1. All models open from the front
DOOR
HANDLE
(PULL TO OPEN)
INDOOR OUTDOOR
(RELEASE BOTH
LATCHES TO
OPEN)
DOOR LATCHES
2 SCREWS
FASTEN FRONT
PANEL INTO
PLACE
ON / OFF
SWITCH THE TOUCH SCREEN ON
OUTDOOR UNIT IS LOCATED
BEHIND FRONT PANEL
1.E Model Overview
These units are o󰀨ered in both Indoor and Outdoor
models for all sizes. The physical appearance of the
indoor and outdoor units is drastically di󰀨erent because
the outdoor model o󰀨ers a fully weathertight enclosure
that hides the touchscreen. Whereas the indoor model
is not fully weathertight and the touchscreen can be
accessed without having to open the unit. See Figure 1
through Figure 9.
Both the indoor and the outdoor models have the
On/O󰀨 switch on the outside of the unit.
Both also have the Rating Plate on the outside panel
to the right. See Figure 8 on page 8
The only component (interior) di󰀨erence between the
indoor and outdoor models is that all of the piping for the
outdoor model, with the exception of the exhaust vent, is
at the BACK of the unit. Figure 9 on page 9
The gas connection, the air inlet, and the water inlet and
outlet are all at the back of the unit. This is consistent for
all sizes.

Page 5
NEOTHERM Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
Figure 3. Location of Components, Size 285
EXHAUST VENT CONNECTION
AIR INLET CONNECTION
GAS CONNECTION
TOUCHSCREEN
HEAT EXCHANGER
GAS VALVE VENTURI
AIR/ GAS
BLOWER
WATER INLET
WATER OUTLET
PRESSURE RELIEF VALVE
AIR PRESSURE SWITCH
DRAIN VALVE
CONDENSATE TRAP
AIR TRANSITION
ON / OFF SWITCH
Figure 2. Location of Components, Sizes 150-210
EXHAUST VENT CONNECTION
GAS CONNECTION
AIR PRESSURE SWITCH
TOUCHSCREEN
HEAT EXCHANGER GAS VALVE
VENTURI
AIR/ GAS
BLOWER
PRESSURE RELIEF VALVE
WATER INLET
WATER OUTLET
AIR INLET CONNECTION
DRAIN VALVE
CONDENSATE TRAP
AIR TRANSITION
ON / OFF SWITCH

Page 6
LAARS Heating Systems
EXHAUST VENT CONNECTION
GAS CONNECTION
TOUCHSCREEN
HEAT EXCHANGER
MANUAL SHUTOFF
GAS VALVE
VENTURI
AIR/ GAS
BLOWER
PRESSURE RELIEF VALVE
WATER INLET
WATER OUTLET
AIR INLET CONNECTION
DRAIN VALVE
CONDENSATE TRAP
GAS VALVE
ON / OFF SWITCH
Figure 4. Location of Components, Indoor Size 399
Figure 5. Location of Components, Indoor Size 500
EXHAUST VENT CONNECTION
PRESSURE RELIEF VALVE
TOUCHSCREEN
HEAT EXCHANGER
MANUAL SHUTOFF
GAS VALVE
VENTURI
GAS VALVE
WATER INLET
WATER OUTLET
AIR INLET CONNECTION
DRAIN VALVE
CONDENSATE TRAP
GAS CONNECTION
AIR/ GAS BLOWER
GAS PRESSURE
SWITCH
AIR PRESSURE SWITCH
ON / OFF SWITCH