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

Page 7
NEOTHERM Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
Figure 6. Location of Components, Size 600
EXHAUST VENT CONNECTION
GAS CONNECTION
PRESSURE RELIEF VALVE
TOUCHSCREEN
HEAT EXCHANGER
MANUAL SHUTOFF
GAS VALVE
VENTURI
AIR/ GAS BLOWER
AIR PRESSURE SWITCH
WATER INLET
WATER OUTLET
AIR INLET CONNECTION
DRAIN VALVE
CONDENSATE TRAP
GAS VALVE
MANUAL SHUTOFF
GAS VALVE
ON / OFF SWITCH
Figure 7. Location of Components, Sizes 750 and 850
WATER INLET
WATER OUTLET
AIR INLET
DRAIN VALVE
CONDENSATE TRAP
AIR/ GAS BLOWER
PRESSURE RELIEF
VALVE
TOUCHSCREEN
HEAT EXCHANGER
EXHAUST VENT
CONNECTION
VENTURI
GAS VALVE
GAS CONNECTION
MANUAL SHUTOFF
GAS VALVE
ON / OFF SWITCH

Page 8
PRV
LAARS Heating Systems
GAS CONNECTION
PRV
EXHAUST
VENT
WATER INLET
WATER OUTLET
AIR INLET
Indoor 850 MBH
RATING PLATE
For piping dimensiona/locations for all
Indoor units, See Table 1 on page 10 GAS
CONNECTION
CONDENSATE
TRAP OUTLET
(Trap is built-in)
RATING PLATE
Figure 8. Connection piping is on the BACK for ALL Outdoor Sizes
GAS
CONNECTION
EXHAUST
VENT
WATER INLET
WATER OUTLET
AIR INLET
CONDENSATE
TRAP OUTLET
(Trap is built-in)
Indoor 150 MBH
For piping dimensions/
locations for all Indoor units,
See Table 1 on page 10

Page 9
NEOTHERM Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
GAS
CONNECTION
EXHAUST
VENT
WATER INLET
WATER OUTLET*
POWER SUPPLY
FOR PUMP
(if ordered with
a pump)
AIR INLET
FILTER BOX
Outdoor 850 MBH
Figure 9. Connection piping is on the BACK for ALL Outdoor Sizes
*PRV must be added to this pipe
during installation.
RATING PLATE
For piping dimensions/locations for all
Outdoor units, See Table 2 on page 12
CONDENSATE
TRAP OUTLET
(Trap is built-in)
RATING PLATE
WATER INLET
WATER OUTLET*
AIR INLET
FILTER BOX
GAS
CONNECTION
*PRV must be added to this pipe
during installation.
EXHAUST
VENT
CONDENSATE
TRAP OUTLET
(Trap is built-in)
Outdoor 150 MBH
For piping dimensions/
locations for all outdoor units,
See Table 2 on page 12

Page 10
For Water Connection Pipe Sizes, See “Table 14.
Water Connection Pipe Sizes” on page 28
LAARS Heating Systems
Table 1. Dimension Drawing, Indoor Sizes 150-850
A B C D E F G J K M N
Size in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm
150 13¼ 34 5¼ 14 18¼ 46 3¼ 810¾ 28 7½ 19 14¼ 36 19½ 49 7½ 19 15¼ 39 13 33
199/210 20½ 52 5¼ 14 18¼ 46 3¼ 817¾ 45 7½ 19 14¼ 36 19½ 49 11¾ 30 15¼ 39 13 33
285 20¼ 52 7¼ 19 19½ 50 6¼ 16 11¼ 29 13½ 34 14 36 15 38 17 43 18¾ 48 13 33
399 25 64 5¼ 13 19½ 50 4¼ 11 14¾ 37 18½ 47 19¼ 49 16½ 42 21¾ 55 18¾ 48 13 33
500 30¼ 77 5¼ 13 19½ 50 4¼ 11 15¼ 38 20 51 20½ 52 19 48 26 66 18¾ 48 13 33
600 29¾ 76 513 19½ 50 4¼ 11 15 38 20 51 3819 48 26 66 18¾ 48 8¼ 21
750 35½ 90 615 19½ 50 5¼ 13 19 48 40½ 103 3¼ 819 48 30¾ 78 18¾ 48 8¼ 21
850 39¾ 101 615 19½ 50 5¼ 13 19 48 44¾ 114 3½ 919 48 35 89 18¾ 48 8¼ 21
LAIR INLET VENT
SIZE in cm in cm in cm
150 19½ 49 37.6 37.6
199/210 26¾ 68 37.6 37.6
285 26¾ 68 411 411
399 31½ 80 411 411
500 37¾ 96 411 411
600 37¾ 96 411 411
750 51 130 411 617
850 55¼ 140 411 617
1.F Dimensions, Indoor Models
(length)
L
SUGGESTED SERVICE CLEARANCE
38 1/2(98)
8 3/4
(22)
7 1/2
(19)
25 (64)
Dimensions are nominal and are shown
in inches, cm.
*Unit is shipped with adapters for the air
and vent that accept standard pipe of
the proper size and type.
Table 1. (dimensions continued)

Page 11
NEOTHERM Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
L
SUGGESTED SERVICE CLEARANCE
38 1/2(98)
8 3/4
(22)
7 1/2
(19)
25 (64)
All Indoor Units have a very
similiar component design with
piping dimensions/locations
that increase as the unit size
increases.
Water and gas piping is
always on the left side of the
unit. Table 1 gives the exact
dimensions for all of the
di󰀨erent model sizes.
ALL Models
See “Table 3. Suggested
Service Clearances” on
page 16

Page 12
For Water Connection Pipe Sizes, See “Table 14.
Water Connection Pipe Sizes” on page 28
AIR FILTER
OUTLET
WATER
WATER
INLET
BOX
GAS INLET CONDENSATE
TRAP OUTLET
D
B
J
A C
G
E
F
VENT K
8 (21)
13 (33)
9 (23)
38 1/2(98)
25 (64 )
26 (66 )
FRONT VIEW
RIGHT SIDE VIEW BACK VIEW
TOP VIEW
L5 1/2(9)
TTotal length
SUGGESTED SERVICE CLEARANCE
12 (31) 12
(31)
12 (31)
Dimensions are nominal and are shown
in inches, cm.
*Unit is shipped with adapters for the air
and vent that accept standard pipe of
the proper size and type.
LAARS Heating Systems
Table 2. Dimension Drawing, OUTDOOR Sizes 150-850
1.G Dimensions, Outdoor Models
285 - 500 MBH
26 (66)
25 (64)
SIZE in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm
150 6-1/4" 16 11" 28 13" 33 17-1/4" 43.8 23-1/2" 60 18" 45.7 27" 69 23-1/2" 60 5-1/4" 13 20" 60 25-1/2" 65 37.6
199 / 210 6-1/4" 16 11" 28 13" 33 17-1/4" 43.8 23-1/2" 60 18" 45.7 27" 69 24-1/2" 60 5-1/4" 13 27" 68.6 32-1/2" 82.5 37.6
285 6" 15.5 11" 28 5" 13 17-1/4" 43.8 24" 61 19" 48 28-1/4" 72 12" 30.5 7-1/4" 18.4 27" 68.6 32-1/2" 82.5 411
399 8" 15.5 19-1/2" 50 7-3/4" 20 17-1/4" 43.8 24" 61 19" 48 28-1/4" 72 12" 30.5 6" 15.2 31-1/4"" 80.5 37-3/4" 96 411
500 5" 13 17-3/4" 45 5" 13 8-1/4" 21 24" 61 19" 48 29-1/4" 74 12" 30.5 5.5" 14 38" 96.5 43-1/2" 110.5 411
600 33-1/2" 85 3.0" 85" 13 8-1/4" 21 24" 61 19" 48 29-1/4" 74 12" 30.5 5-3/4" 14.6 38" 96.5 43-1/2" 110.5 411
750 32-3/4" 83.2 3.0" 85-1/4" 13.4 17-1/4" 43.8 24" 61 19" 48 29-1/4" 74 12" 30.5 5-3/4" 14.6 51-1/4" 130 57-3/4" 146.7 617
850 32-3/4"
83.2
3.0"
8
5-1/4"
13.4
17-1/4"
43.8
24"
61
19"
48
29-1/4"
74
12"
30.5
5-3/4"
14.6
55-3/4" 141.5 61-1/4" 155.5 617
E
F
VENT
A
B
C
D
G
J
K
L (Length)
T (Total Length)
ALL Model Sizes
See “Table 3. Suggested Service Clearances” on page 16

Page 13
NEOTHERM Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
J
A
G
E
D B
F
BACK VIEW
C
AIR FILTER
WATER
OUTLET
WATER
INLET
BOX
GAS INLET
CONDENSATE
TRAP OUTLET
L
AIR FILTER
KNOCK-OUTS FOR
POWER TO
ALL OPTIONAL
EQUIPMENT
OUTLET
WATER
WATER
INLET
BOX
GAS INLET
CONDENSATE
TRAP OUTLET
D
F
B
J
E
G
A
C
VENT K 8 21
13 33
26 (66 )
FRONT VIEW RIGHT SIDE VIEW
BACK VIEW
TOP VIEW
L
AIR FILTER
OUTLET
WATER
WATER
INLET
BOX
GAS INLET
CONDENSATE
TRAP OUTLET
D
F
B
J
E
G
A
C
VENT K 8 21
13 33
26 (66 )
FRONT VIEW RIGHT SIDE VIEW
BACK VIEW
TOP VIEW
Table 2. (dimensions ontinued)
600 MBH
BACK VIEWS of the Outdoor Models
750 - 850 MBH
150 - 210 MBH
SIZE in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm
150 6-1/4" 16 11" 28 13" 33 17-1/4" 43.8 23-1/2" 60 18" 45.7 27" 69 23-1/2" 60 5-1/4" 13 20" 60 25-1/2" 65 37.6
199 / 210 6-1/4" 16 11" 28 13" 33 17-1/4" 43.8 23-1/2" 60 18" 45.7 27" 69 24-1/2" 60 5-1/4" 13 27" 68.6 32-1/2" 82.5 37.6
285 6" 15.5 11" 28 5" 13 17-1/4" 43.8 24" 61 19" 48 28-1/4" 72 12" 30.5 7-1/4" 18.4 27" 68.6 32-1/2" 82.5 411
399 8" 15.5 19-1/2" 50 7-3/4" 20 17-1/4" 43.8 24" 61 19" 48 28-1/4" 72 12" 30.5 6" 15.2 31-1/4"" 80.5 37-3/4" 96 411
500 5" 13 17-3/4" 45 5" 13 8-1/4" 21 24" 61 19" 48 29-1/4" 74 12" 30.5 5.5" 14 38" 96.5 43-1/2" 110.5 411
600 33-1/2" 85 3.0" 85" 13 8-1/4" 21 24" 61 19" 48 29-1/4" 74 12" 30.5 5-3/4" 14.6 38" 96.5 43-1/2" 110.5 411
750 32-3/4" 83.2 3.0" 85-1/4" 13.4 17-1/4" 43.8 24" 61 19" 48 29-1/4" 74 12" 30.5 5-3/4" 14.6 51-1/4" 130 57-3/4" 146.7 617
850 32-3/4"
83.2
3.0"
8
5-1/4"
13.4
17-1/4"
43.8
24"
61
19"
48
29-1/4"
74
12"
30.5
5-3/4"
14.6
55-3/4" 141.5 61-1/4" 155.5 617
E
F
VENT
A
B
C
D
G
J
K
L (Length)
T (Total Length)
SIZE in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm in cm
150 6-1/4" 16 11" 28 13" 33 17-1/4" 43.8 23-1/2" 60 18" 45.7 27" 69 23-1/2" 60 5-1/4" 13 20" 60 25-1/2" 65 37.6
199 / 210 6-1/4" 16 11" 28 13" 33 17-1/4" 43.8 23-1/2" 60 18" 45.7 27" 69 24-1/2" 60 5-1/4" 13 27" 68.6 32-1/2" 82.5 37.6
285 6" 15.5 11" 28 5" 13 17-1/4" 43.8 24" 61 19" 48 28-1/4" 72 12" 30.5 7-1/4" 18.4 27" 68.6 32-1/2" 82.5 411
399 8" 15.5 19-1/2" 50 7-3/4" 20 17-1/4" 43.8 24" 61 19" 48 28-1/4" 72 12" 30.5 6" 15.2 31-1/4"" 80.5 37-3/4" 96 411
500 5" 13 17-3/4" 45 5" 13 8-1/4" 21 24" 61 19" 48 29-1/4" 74 12" 30.5 5.5" 14 38" 96.5 43-1/2" 110.5 411
600 33-1/2" 85 3.0" 85" 13 8-1/4" 21 24" 61 19" 48 29-1/4" 74 12" 30.5 5-3/4" 14.6 38" 96.5 43-1/2" 110.5 411
750 32-3/4" 83.2 3.0" 85-1/4" 13.4 17-1/4" 43.8 24" 61 19" 48 29-1/4" 74 12" 30.5 5-3/4" 14.6 51-1/4" 130 57-3/4" 146.7 617
850 32-3/4"
83.2
3.0"
8
5-1/4"
13.4
17-1/4"
43.8
24"
61
19"
48
29-1/4"
74
12"
30.5
5-3/4"
14.6
55-3/4" 141.5 61-1/4" 155.5 617
E
F
VENT
A
B
C
D
G
J
K
L (Length)
T (Total Length)
Ø
The Outdoor versions have a greater component location
variance than the Indoor models. 4 Back Views are given to
show the piping dimensions/locations for all of the di󰀨erent
piping layouts. Table 2 gives the exact dimensions for all of the
di󰀨erent model sizes.

Page 14
LAARS Heating Systems
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.
Optional Indoor Pump Kit
1.H The Installation Kit (installation parts box).
The Indoor models are shipped in a single crate with the
Installation Kit (cardboard box). Check the contents of the
Installation Kit with the items listed in Figure 10 and Figure 11.
Additional parts may be packed inside the unit.
Figure 10. Standard Installation Components
Figure 11. Additional Components, depending on model size.
Document Bag
(all documents in one bag)
Terminal Block Jumper
(the Terminal Block Jumper is in the document bag)
Sensor Kits (Tank, Outdoor and System Sensors, all in the
same bag (2 boxes, a sensor, and a wire).
Volume Water Heaters will not have an Outdoor Sensor
Air Intake Terminal Assembly
(elbow and a screen)
Vent Pipe
Exhaust Terminal Assembly
(end pipe and a screen),
Temp/Pressure Gauge Kit
(a bushing, an NPT Tee, and the gauge in a small box)
80/105 150
199/210 285 399 500 600 750/850
Flow Switch Kit (ow switch, 2 wires, and an NPT tee)
1 1 1 1
Exhaust Adapter Assembly 1 1
Grid Screen, Venting
2 2 2
Vent Adapter, 6” PVC to 6” Stainless Steel 1
NPT Pipe (for ow switch)
1 1 1 1
Grommets for ow switch wires
2 2 2 2

Page 15
NEOTHERM Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
NOTE: The pump and outdoor housing will
typically be shipped inside the unit. Pump will
need to be piped and wired on site. A 62” long
wire harness is provided but a conduit will need
to be provided by the electrician at time of boiler
installation.
EXPLODED VIEW
ASSEMBLED
VIEW
50D4140/QTY. 20D4141/QTY. 15D4140/QTY. PART NO. DESCRIPTION ITEM NO.
BOM Table
444 F0024300 SCREW, #10-16 X 5/8", STL, HX WSHR HD, #3 PT 6
222 15D3116 SIDE PANEL, PUMP COVER, NTOD 5
111
15D3115 TOP PANEL, PUMP COVER, NTOD 4
111 50D7605 HARNESS, PUMP, NTOD 150-500 3
- - 2 A2115900 FLANGE, PUMP, 1-1/4" NPT, 3 7/16" BOLT PAT, BRASS
22 - - A2116000 FLANGE, PUMP, 1-1/2" NPT, BRASS, 3 7/16" BOLT PAT, BRASS
- 2 - A2116100 FLANGE, PUMP, 1-1/4" NPT, 3 5/32 BOLT PAT, BRASS
- 1 - A2120700 PUMP, CIRCULATOR ARMSTRONG
11 - - A2120800 PUMP, CIRCULATOR, ARMSTRONG E22.2B
- - 1 A2120600 PUMP, CIRCULATOR, ARMSTRONG E11.2LFB
PART NUMBER MODEL
15D4140 15D0701
20D4141 20D0701
50D4140 30D0701
50D4140 40D0701
50D4140 50D0304
50D4140 50D0704
D
C
B
A
B
C
D
1
2
3
4
4
3
2
THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE
PROPRIETARY TO LAARS HEATING SYSTEMS AND SHALL NOT BE
REPRODUCED, TRANSFERRED TO OTHER DOCUMENTS, USED OR
DISCLOSED TO OTHERS FOR MANUFACTURING OR ANY OTHER
PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED IN WRITING
BY LAARS HEATING SYSTEMS.
FMA56A
DWG NO.
50D4140
SH
1
REV
A
CJ 5/17/16
REVISIONS
REV.
CHANGE:
APPR
ENGR APPR
ECN
DRAFT
CHECK
REMOVED ITEM 2 A2116100 FROM 50D4140.
A
15-127N-05 XR 5/17/16
SCALE: NONE
INTENDED SIZE:
SOFTWARE
DWG. NO:
C
SHEET 1 OF 1
REV.
APPROVALS
DRAFT
ENGR
APPR
UNLESS OTHERWISE SPECIFIED:
DO NOT SCALE DRAWING.
THIRD ANGLE PROJECTION.
DIMENSIONS ARE IN INCHES.
TOLERANCES ARE:
MATERIAL:
FINISH
SEE PARTS LIST
NA
XR 4/14/16
S
CJ 4/14/16
DECIMALS .X .1
DECIMALS .XX
.03
DECIMALS .XXX
.010
ANGLES 1
TITLE:
FRACTIONS 1/8"
PUMP ASSEMBLY,
NTVOD 150-500
50D4140 A
PROJECT
0080
11 1/4 ”
11 1/4 ”
6 1/2 ”
HARNESS
EXPLODED VIEW
ASSEMBLED
VIEW
50D4140/QTY. 20D4141/QTY. 15D4140/QTY. PART NO. DESCRIPTION ITEM NO.
BOM Table
444 F0024300 SCREW, #10-16 X 5/8", STL, HX WSHR HD, #3 PT 6
222 15D3116 SIDE PANEL, PUMP COVER, NTOD 5
111 15D3115 TOP PANEL, PUMP COVER, NTOD 4
111 50D7605 HARNESS, PUMP, NTOD 150-500 3
- - 2 A2115900 FLANGE, PUMP, 1-1/4" NPT, 3 7/16" BOLT PAT, BRASS
22 - - A2116000 FLANGE, PUMP, 1-1/2" NPT, BRASS, 3 7/16" BOLT PAT, BRASS
- 2 - A2116100 FLANGE, PUMP, 1-1/4" NPT, 3 5/32 BOLT PAT, BRASS
- 1 - A2120700 PUMP, CIRCULATOR ARMSTRONG
11 - - A2120800 PUMP, CIRCULATOR, ARMSTRONG E22.2B
- - 1 A2120600 PUMP, CIRCULATOR, ARMSTRONG E11.2LFB
PART NUMBER MODEL
15D4140 15D0701
20D4141 20D0701
50D4140 30D0701
50D4140 40D0701
50D4140 50D0304
50D4140 50D0704
D
C
B
A
B
C
D
1
2
3
4
4
3
2
THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE
PROPRIETARY TO LAARS HEATING SYSTEMS AND SHALL NOT BE
REPRODUCED, TRANSFERRED TO OTHER DOCUMENTS, USED OR
DISCLOSED TO OTHERS FOR MANUFACTURING OR ANY OTHER
PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED IN WRITING
BY LAARS HEATING SYSTEMS.
FMA56A
DWG NO.
50D4140
SH
1
REV
A
CJ 5/17/16
REVISIONS
REV.
CHANGE:
APPR
ENGR APPR
ECN
DRAFT
CHECK
REMOVED ITEM 2 A2116100 FROM 50D4140.
A
15-127N-05 XR 5/17/16
SCALE: NONE
INTENDED SIZE:
SOFTWARE
DWG. NO:
C
SHEET 1 OF 1
REV.
APPROVALS
DRAFT
ENGR
APPR
UNLESS OTHERWISE SPECIFIED:
DO NOT SCALE DRAWING.
THIRD ANGLE PROJECTION.
DIMENSIONS ARE IN INCHES.
TOLERANCES ARE:
MATERIAL:
FINISH
SEE PARTS LIST
NA
XR 4/14/16
S
CJ 4/14/16
DECIMALS .X .1
DECIMALS .XX
.03
DECIMALS .XXX
.010
ANGLES 1
TITLE:
FRACTIONS 1/8"
PUMP ASSEMBLY,
NTVOD 150-500
50D4140 A
PROJECT
0080
11 1/4 ”
11 1/4 ”
6 1/2 ”
HARNESS
AIR FILTER
OUTLET
WATER
WATER
INLET
BOX
GAS INLET CONDENSATE
TRAP OUTLET
D
B
J
A C
G
E
F
VENT K
8 (21)
13 (33)
9 (23)
38 1/2(98)
25 (64 )
26 (66 )
FRONT VIEW RIGHT SIDE VIEW BACK VIEW
TOP VIEW
L5 1/2(9)
TTotal length
SUGGESTED SERVICE CLEARANCE
12 (31) 12
(31)
12 (31)
TOP PANEL
SIDE PANEL
SIDE PANEL
WATER INLET
FLOW
FLOW
Outdoor Pump Kit
Figure 13. Outdoor Pump Kit
Figure 12. Additional components for
outdoor models.
The OUTDOOR Model Installation Kits, in
addition to what is shown in Figure 10 and
Figure 11, will include:
Some Class IV venting
components are not included with
units shipped to Canada.
Vent Pipe Extender,
Pipe Adapter,
Bird Screen,
PRV,
NPT Pipe Tee

Page 16
LAARS Heating Systems
SECTION 2
LOCATING THE UNIT
2.A General Information
The ‘Indoor’ unit is designed and CSA-certied
for indoor installations only.
The ‘Outdoor’ unit is designed and CSA-certied for
outdoor installations only.
If installing in a location that may experience freezing
temperatures, precautions must be taken to prevent water
in the heat exchanger and condensate inside and outside
of the boiler from freezing. Damage due to freezing water
or condensate is not covered by the warranty.
The appliance should be located to provide clearances on
all sides for maintenance and inspection. It 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 such a location is
not available, it is recommended that a suitable drain pan,
adequately drained, be installed under the appliance.
Always install the unit on a rm, level surface.
The unit is design certied by CSA-International for
installation on combustible ooring; in basements; in
closets, utility rooms or alcoves. These units must never be
installed on carpeting. The location for the unit should be
chosen with regard to the vent pipe lengths and external
plumbing and on a level surface.
The Indoor units 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 unit 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 Outdoor units must be installed at least 10 ft (the vent
pipe) from any door or window. The exhaust vent shall
not be under any overhang or roof. Use only the vent
components included with the boiler.
The dimensions and requirements that are shown in Table
3 should be met when choosing the locations for the
appliance.
2.B Locating Appliance for Correct Vent
Distance from Outside Wall or
Roof Termination
The forced draft combustion air blower in the appliance
has su󰀩cient power to vent properly when the
guidelines in Table 4 are followed.
For concentric vent terminal kit (optional), follow
installation instructions included with the kit.
INDOOR OUTDOOR
UNIT SURFACE INCHES CM INCHES CM
Left Side 12.5 12 31
Right Side 12 31 12 31
Top (for ue) 24 61 48 122
Back 615 12*31*
Closet, Front 12.5 12.5
Front 24 61 24 61
Vent Per Vent Manufacturer
Certied by CSA for zero clearance to combustible materials on all sides.
*from lter box face. See “Table 2. Dimension Drawing, OUTDOOR
Sizes 150-850” on page 12
INTAKE / EXHAUST
STANDARD MAX EQUIV. OPTIONAL MAX EQUIV.
SIZE VENT FT. MVENT FT. M
150 3” 100 30 n/a — —
199/210 3” 100 30 n/a — —
285 4” 100 30 n/a — —
399 4” 100 30 n/a — —
500 4” 100 30 n/a — —
600*4” 40 6.1 6” 100 30
750 4” 40 6.1 6” 100 30
850 4” 40 6.1 6” 100 30
Combustion Intake and Vent must be the same size.
Installations in the U.S. require exhaust vent pipe that is a combination
of PVC & CPVC complying withANSI/ASTM D1785 F441 or stainless
steel complying with the stainless steel vent suppliers listed in Section 3.
Installations in Canada require exhaust vent pipe that is certied to
ULC S636.
Intake (air) pipe must be PVC or CPVC that complies withANSI/ASTM D1785
F441,ABS that complies withANSI/ASTM D1527 or galvanized material.
The installer must comply fully with the manufacturer’s installation
instructions, including use of minimum exhaust length CPVC, to main-
tain ANSI Z21.13 safety certication.
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 (1.5m) for each 90° elbow used. Add 2 1/2 feet (.76
meters) for each 45 elbow used.
*For any combination of vent and intake lengths up to 40 equivalent
feet, any even or uneven combination of length is allowed. For overall
lengths greater than 40 equivalent feet, the exhaust may be up to 20
feet greater than the intake length.
Table 3. Suggested Service Clearances
Table 4. Vent / Air Pipe Sizes and Length
NOTE: When located on the same wall, the
combustion air intake terminal must be installed a
minimum of 12” below the exhaust terminal.
Models 399-850 also require a minimum horizontal
distance from intake to exhaust terminal of 36”.