Laars NTH, NTV Installation Manual
Installation and Operation Instructions Document 1330E
Installation and Operation
Instructions for
®
with Touchscreen Display
Modulating Boilers and
Volume Water Heaters
Outdoor models
NTH & NTV
Sizes 150 – 850 MBTU/h
Indoor models
NTH Sizes 285 – 850 MBTU/h
NTV Sizes 150 – 850 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.
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.
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion
ou pour éviter tout dommage matériel, toute
blessure ou la mort.
Ne pas entreposer ni utiliser d’essence ni
d’autres vapeurs ou liquides inammables dans
le voisinage de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d’allumer d’appareils.
• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones dansle bâtiment où vous
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.
AVERTISSEMENT
H2374100E
Table of Contents
LAARS Heating Systems
SECTION 1
General Information
1.A Introduction .......................................................1
1.B Warranty ...........................................................1
1.C ModelIdentication ...........................................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 V ent 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
6A.2
6A.3
6A.4
6A.5
6A.6 Recognized Chemicals ...................................29
Connections
Boiler Cold W
Condensate Drain ...........................................29
Freeze Protection ...........................................29
Boiler Suggested Piping Schematics .........29-35
....................................................28
ater Make-Up ............................28
SECTION 6B
Water Connections - Water Heater
6B.1 Heater Water Quality ......................................36
6B.2
6B.3
6B.4
6B.5
6B.6
6B.7
Piping Requirements ......................................36
Cold W
Condensate Drain ...........................................37
Freeze Protection ...........................................37
Heater Suggested Piping Schematics ............37
Heater Suggested Pumps ..............................37
ater Make-Up ......................................36
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
i
NEOT
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
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 VericationProcessforSafety-Related
Parameters ....................................................49
8.E Checking Individual Parameters ....................50
8.F Setting the Date and Time..............................51
8.G The Conguration Menu
8.G.1 SystemIdentication&Access ...................53
8.G.2ACH-CentralHeatConguration...............53
2B Setting Up 4-20 mA Set Point ..................53
8.G.3 OutdoorResetConguration ......................54
8.G.4 DHW-DomesticHotWaterConguration .54
8.G.5 WarmWeatherShutdownConguration ....54
8.G.6 DemandPriorityConguration ...................55
8.G.7 ModulationConguration ............................55
8.G.8 Pump Connections .....................................55
8.G.9 StatisticsConguration ...............................56
8.G.10 High Limits ................................................56
8.G.11 Stack Limits ................................................56
8.G.12 Anti-CondensationConguration ..............56
8.G.13 FrostProtectionConguration ..................56
8.G.14 SystemConguration ...............................56
8.G.15 FanConguration .....................................57
8.G.16 SensorConguration ................................57
About Lead Lag
8.G.17LeadLagFollowerConguration ..............60
8.G.18LeadLagLeaderConguration ................62
8.H Congurefora
Building Automation System ..........................65
TheCongurationSub-Menus(ALL18) .......53
.............................. ................58
8.I Combustion Setup
8.J Adjusting CO2 ...............................................68
............................52
...................................66
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 and Alert Histories .......78
1 1.B T roubleshooting 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
ii
LAARS Heating Systems
NEOT
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
SECTION 1
GENERAL INFORMATION
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
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.
NOTE: Throughout the content of this manual,
the NeoTherm will be referred to as a ‘unit’.
NeoTherm = unit
Page 1
1.C Model Identication
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, Heater only
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 (conguration 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 - ST ANDARD (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)
3 N T
REVISION
3 - THIRD
Page 2
1.D Safety Notes
LAARS Heating Systems
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 modications to the
boiler, its gas controls, or wiring may void the warranty. If
eld conditions require modications, consult the factory
representative before initiating such modications.
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 conguration can cause fuel buildup and
explosion. Improper user operation may result in
property loss, severe physical injury, or death.
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 shuto valve. Do not shut o the power
switch. Contact your heating contractor, gas company,
or factory representative.
DANGER
The inlet gas pressure to the appliance must not
exceed 13” W.C. (3.2kPa).
WARNING
:
Cancer and Reproductive Harm
www.P65Warnings.ca.gov
As required by the State of California Proposition 65.
Note: The unit is protected against over-pressurization.
A pressure relief valve is included with each unit.
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.
NEOT
Electrical Shock Hazard
Edition, or 2) CSA STD. C22.1 “Canadian Electrical Code
HERM
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
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
- Part 1.” This appliance must be electrically grounded in
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
WARNING
disconnect.
accordance with these codes.
Page 3
Page 4
1.E Model Overview
LAARS Heating Systems
These units are oered in both Indoor and Outdoor
models for all sizes. The physical appearance of the
indoor and outdoor units is drastically dierent because
the outdoor model oers 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.
ON / OFF
SWITCH
Both also have the Rating Plate on the outside panel
to the right. See Figure 8 on page 8
The only component (interior) dierence 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.
THE TOUCH SCREEN ON
OUTDOOR UNIT IS LOCATED
BEHIND FRONT PANEL
2 SCREWS
FASTEN FRONT
PANEL INTO
PLACE
INDOOR OUTDOOR
Figure 1. All models open from the front
DOOR LATCHES
(RELEASE BOTH
LA TCHES T O
OPEN)
DOOR
HANDLE
(PULL TO OPEN)
NEOT
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
Page 5
EXHAUST VENT CONNECTION
GAS CONNECTION
TOUCHSCREEN
HEAT EXCHANGER
AIR/ GAS
BLOWER
VENTURI
PRESSURE RELIEF VALVE
WATER INLET
WATER OUTLET
AIR INLET CONNECTION
AIR PRESSURE SWITCH
ON / OFF SWITCH
DRAIN VALVE
GAS VALVE
AIR TRANSITION
CONDENSATE TRAP
Figure 2. Location of Components, Sizes 150-210
EXHAUST VENT CONNECTION
AIR INLET CONNECTION
GAS CONNECTION
TOUCHSCREEN
HEAT EXCHANGER
GAS VALVE
AIR/ GAS
BLOWER
WATER INLET
WATER OUTLET
PRESSURE RELIEF VALVE
AIR PRESSURE SWITCH
ON / OFF SWITCH
DRAIN VALVE
CONDENSATE TRAP
VENTURI
AIR TRANSITION
Figure 3. Location of Components, Size 285
Page 6
LAARS Heating Systems
EXHAUST VENT CONNECTION
PRESSURE RELIEF VALVE
GAS CONNECTION
TOUCHSCREEN
HEAT EXCHANGER
MANUAL SHUTOFF
GAS VALVE
AIR/ GAS
BLOWER
VENTURI
WATER INLET
WATER OUTLET
AIR INLET CONNECTION
ON / OFF SWITCH
DRAIN VALVE
CONDENSATE TRAP
GAS VALVE
Figure 4. Location of Components, Indoor Size 399
EXHAUST VENT CONNECTION
PRESSURE RELIEF VALVE
GAS CONNECTION
TOUCHSCREEN
HEAT EXCHANGER
MANUAL SHUTOFF
GAS VALVE
VENTURI
GAS VALVE
GAS PRESSURE
SWITCH
WATER INLET
WATER OUTLET
AIR INLET CONNECTION
AIR PRESSURE SWITCH
ON / OFF SWITCH
DRAIN VALVE
CONDENSATE TRAP
AIR/ GAS BLOWER
Figure 5. Location of Components, Indoor Size 500
NEOT
HERM
EXHAUST VENT CONNECTION
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
Page 7
GAS CONNECTION
PRESSURE RELIEF VALVE
TOUCHSCREEN
MANUAL SHUTOFF
GAS VALVE
HEAT EXCHANGER
GAS VALVE
MANUAL SHUTOFF
GAS VALVE
Figure 6. Location of Components, Size 600
WATER INLET
WATER OUTLET
AIR INLET CONNECTION
AIR PRESSURE SWITCH
ON / OFF SWITCH
DRAIN VALVE
CONDENSATE TRAP
AIR/ GAS BLOWER
VENTURI
GAS CONNECTION
PRESSURE RELIEF
VALVE
AIR INLET
TOUCHSCREEN
GAS VALVE
VENTURI
AIR/ GAS BLOWER
HEAT EXCHANGER
WATER INLET
EXHAUST VENT
CONNECTION
WATER OUTLET
ON / OFF SWITCH
DRAIN VALVE
MANUAL SHUTOFF
GAS VALVE
CONDENSATE TRAP
Figure 7. Location of Components, Sizes 750 and 850
Page 8
LAARS Heating Systems
CONNECTION
WATER OUTLET
AIR INLET
RATING PLATE
Indoor 150 MBH
For piping dimensions/
locations for all Indoor units,
See Table 1 on page 10
GAS
PRV
EXHAUST
VENT
W
ATER INLET
CONDENSATE
TRAP OUTLET
(Trap is built-in)
AIR INLET
RATING PLATE
Indoor 850 MBH
For piping dimensiona/locations for all
Indoor units, See Table 1 on page 10
GAS CONNECTION
PRV
WATER OUTLET
W
ATER INLET
EXHAUST
VENT
CONDENSATE
TRAP OUTLET
(Trap is built-in)
GAS
CONNECTION
Figure 8. Connection piping is on the BACK for ALL Outdoor Sizes
NEOT
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
EXHAUST
VENT
RATING PLATE
AIR INLET
FILTER BOX
Page 9
Outdoor 150 MBH
For piping dimensions/
locations for all outdoor units,
See Table 2 on page 12
RATING PLATE
WATER OUTLET
WATER INLET
CONDENSA
TRAP OUTLET
(Trap is built-in)
CONNECTION
PRV must be added to this pipe
*
during installation.
TE
GAS
EXHAUST
VENT
GAS
CONNECTION
*
Outdoor 850 MBH
For piping dimensions/locations for all
Outdoor units, See Table 2 on page 12
Figure 9. Connection piping is on the BACK for ALL Outdoor Sizes
POWER SUPPLY
FOR PUMP
(if ordered with
WATER OUTLET
W
ATER INLET
AIR INLET
FILTER BOX
CONDENSATE
TRAP OUTLET
(Trap is built-in)
PRV must be added to this pipe
*
during installation.
a pump)
*
Page 10
L
SUGGESTED SERVICE CLEARANCE
38
1
/
2
(98)
8
3
/
4
(22)
7
1
/
2
(19)
25 (64)
LAARS Heating Systems
1.F Dimensions, Indoor Models
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 8 10¾ 28 7½ 19 14¼ 36 19½ 49 7½ 19 15¼ 39 13 33
199/210 20½ 52 5¼ 14 18¼ 46 3¼ 8 17¾ 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 5 13 19½ 50 4¼ 11 15 38 20 51 3 8 19 48 26 66 18¾ 48 8¼ 21
750 35½ 90 6 15 19½ 50 5¼ 13 19 48 40½ 103 3¼ 8 19 48 30¾ 78 18¾ 48 8¼ 21
850 39¾ 101 6 15 19½ 50 5¼ 13 19 48 44¾ 114 3½ 9 19 48 35 89 18¾ 48 8¼ 21
Table 1. Dimension Drawing, Indoor Sizes 150-850
SIZE in cm in cm in cm
L
AIR INLET VENT
(length)
150 19½ 49 3 7.6 3 7.6
199/210
285 26¾ 68 4 11 4 11
399 31½ 80 4 11 4 11
500 37¾ 96 4 11 4 11
600 37¾ 96 4 11 4 11
750 51 130 4 11 6 17
850 55¼ 140 4 11 6 17
26¾ 68 3 7.6
3 7.6
Table 1. (dimensions continued)
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.
For Water Connection Pipe Sizes, See “Table 14.
Water Connection Pipe Sizes” on page 28
NEOT
L
SUGGESTED SERVICE CLEARANCE
38
1
/
2
(98)
8
3
/
4
(22)
7
1
/
2
(19)
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
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
dierent model sizes.
Page 11
See “Table 3. Suggested
Service Clearances” on
page 16
ALL Models
Page 12
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 3 7.6
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 3 7.6
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 4 11
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 4 11
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 4 11
600
33-1/2" 85 3.0" 8 5" 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 4 11
750
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 51-1/4" 130 57-3/4" 146.7 6 17
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 6 17
E
F
VENT
ABCDGJK
L (Length)
T (Total Length)
1.G Dimensions, Outdoor Models
Table 2. Dimension Drawing, OUTDOOR Sizes 150-850
LAARS Heating Systems
For Water Connection Pipe Sizes, See “Table 14.
Water Connection Pipe Sizes” on page 28
12 (31)
VENT
K
TOP VIEW
12 (31)
SUGGESTED SERVICE CLEARANCE
See “Table 3. Suggested Service Clearances” on page 16
8 (21)
(33)
13
12
(31)
1
38
/
(98)
2
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.
26 (66)
25 (64)
ALL Model Sizes
285 - 500 MBH
WATER
OUTLET
WATER
INLET
G
AIR FILTER
BOX
9 (23)
E
J
GAS INLET
A
L
Total length
T
1
/
5
(9)
2
F
RIGHT SIDE VIEW
CONDENSATE
TRAP OUTLET
D
B
BACK VIEW
C
NEOT
F
8
21
13
33
8
21
13
33
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 3 7.6
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 3 7.6
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 4 11
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 4 11
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 4 11
600
33-1/2" 85 3.0" 8 5" 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 4 11
750
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 51-1/4" 130 57-3/4" 146.7 6 17
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 6 17
E
F
VENT
A
BCDGJ
K
L (Length)
T (Total Length)
5-3/4"
14.6
55-3/4" 141.5 61-1/4" 155.5 6 17
VENT
K
L (Length)
T (Total Length)
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
Table 2. (dimensions ontinued)
Page 13
Ø
WATER
OUTLET
AIR FILTER
BOX
BACK VIEWS of the Outdoor Models
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 dierent
piping layouts. Table 2 gives the exact dimensions for all of the
dierent model sizes.
600 MBH
WATER
OUTLET
WATER
INLET
B
GAS INLET
A
G
E
A
150 - 210 MBH
750 - 850 MBH
KNOCK-OUTS FOR
POWER TO
ALL OPTIONAL
EQUIPMENT
WATER
INLET
CONDENSATE
TRAP OUTLET
GAS INLET
D
B
GAS INLET
WATER
OUTLET
WATER
INLET
J
C
B
A
G
AIR FILTER
BOX
CONDENSATE
TRAP OUTLET
F
D
C
E
J
G
E
J
AIR FILTER
BOX
CONDENSATE
TRAP OUTLET
C
D
F
Page 14
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.
Doc ument Bag
(all documents in one bag)
Term inal Block Jumper
(the Terminal Block Jumper is in the document bag)
Sen sor 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 I ntake Terminal Assembly
(elbow and a screen)
Vent Pipe
Exh aust Terminal Assembly
(end pipe and a screen),
Tem p/Pressure Gauge Kit
(a bushing, an NPT Tee, and the gauge in a small box)
Figure 10. Standard Installation Components
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.
80/105
Flow Switch Kit
150
199/210
285 399 500 600 7
(ow switch, 2 wires, and an NPT tee)
1 1 1 1
Exhaust Adapter Assembly
Grid Screen, Venting
2 2 2
Vent Adapter, 6” PVC to 6” Stainless Steel
NPT Pipe (for ow switch)
1 1 1 1
Grommets for ow switch wires
2 2 2 2
Figure 11. Additional Components, depending on model size.
50/850
1 1
1
Optional Indoor Pump Kit
NEOT
EXPLODED VIEW
4
3
2
HARNESS
D
C
2
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
AIR FILTER
OUTLET
WATER
WATER
INLET
BOX
GAS INLET
CONDENSATE
TRAP OUTLET
J
A
C
G
E
VENT
K
8
(21)
13
(33)
9 (23)
38
1
/
2
(98)
TOP VIEW
SUGGESTED SERVICE CLEARANCE
12 (31)
12
(31)
12
(31)
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
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.
Outdoor Pump Kit
Page 15
Vent Pipe Extender,
Pipe Adapter,
Bird Screen,
PRV,
NPT Pipe Tee
Figure 12. Additional components for
outdoor models.
EXPLODED VIEW
HARNESS
FLOW
SIDE PANEL
11
1/
4
6
1/
”
2
ASSEMBLED
VIEW
TOP PANEL
FLOW
SIDE PANEL
WATER INLET
”
11
1/
”
4
Figure 13. Outdoor Pump Kit
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.
Page 16
LAARS Heating Systems
SECTION 2
LOCATING THE UNIT
2.A General Information
The ‘Indoor’ unit is designed and CSA-certied
for indoor installations only.
The ‘Outdoor’ unit is designed and CSA-certied 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 certied 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 sucient 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.
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”.
INDOOR OUTDOOR
UNIT SURFACE INCHES CM INCHES CM
Left Side 1 2.5 12 31
Right Side 12 31 12 31
Top (for ue) 24 61 48 122
Back 6 15 12* 31
Closet, Front 1 2.5 1 2.5
Front 24 61 24 61
Vent Per Vent Manufacturer
Certied 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
*
Table 3. Suggested Service Clearances
INTAKE / EXHAUST
STANDARD MAX EQUIV. OPTIONAL MAX EQUIV.
SIZE VENT FT. M VENT 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
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 with ANSI/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 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 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 certication.
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.
*
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.
4” 40 6.1 6” 100 30
*
For any combination of vent and intake lengths up to 40 equivalent
Table 4. Vent / Air Pipe Sizes and Length
NEOT
ALLOWABLE SINGLE WALL STAINLESS STEEL VENT SUPPLIERS AND PART NUMBERS
Safe-T Vent EZ Seal FasNSeal Z Flex
2SVSAxx (OD)
2SVSTTAxx (ID)
Horizontal Termination (bir d screen
Horizontal Termination
(bird screen)
IASPPxx (2" - 4")
IASSSxx (5" - 12")
IASSSxx (5" - 12")
xPPS-VTML (5"-8")
Trade Name / Model
Trade Name / Model
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
SECTION 3
VENTING AND COMBUSTION AIR
3.A General Venting
This product requires a special venting system. Refer to
venting supplier’s instructions for complete parts list and
method of installation. The manufacturers and product
lines listed on the following tables have been tested and
authorized to safely operate with this unit. Suppliers
of stainless steel and polypropylene venting that are
not listed on these tables are not permitted for use with
these category III/ IV products.
MFR MODEL NUMBER (ABBREVIATED)
Selkirk
Example Components
90° Elbow 9x14 FSELB90xx 2SVEExx90
Pipe 9x07 FSVLxxxx 2SVEPxxxx
Boiler Adapter 5x01BOI FSAAUx
9x92 FSBSx 2SVSTPXxx
Vertical Termination (rain cap) 5X00CI FSRCx 2SVSRCxx
Inlet Air Termination 9xTERM FSAIHXX* 2SVSTEXxx90
Adapter, SS to CPVC FSA-xxFNSM-xPVCF
Adapter SS to PP FSAAUx-xPP 2ZDCPVCx**
Table 5. Allowable Single Wall Stainless Steel Vent Suppliers and Part Numbers
Do not mix venting suppliers and models in venting
systems. Failure to comply could result in personal
injury, property damage, or death.
Installations must comply with applicable national, state
and local codes.
DuraVent
*4", 6" & 7" only **up to 6"
NovaFlex
Page 17
ALLOWABLE POLYPROPYLENE VENT MANUFACTURERS / TRADE NAMES
MFR MODEL NUMBER (ABBREVIATED)
CentroTherm DuraVent
Example Components
Single Wall Pipe ISVLxxxx xPPS-x 83x002 ZDPx
Elbow ISELxxxx xPPS-E90L 83x08 2ZDEx87
PVC Adapter ISAGLxxxx
Vertical Termination
Air Inlet 2ZDESx
InnoFlue PolyPro
xPPS-ADL (to 4")
xPPS-xxPVCM-xPPF (>4")
xPPS-BG (2" - 6")
IASPPxx (2" - 4")
xPPS-VKL (<5")
Table 6. Allowable Polypropylene Vent Manufacturers / Trade Names
NOTES:
1. “x”, “xx”, and “xxxx” refer to variations in nominal size. See manufacturer’s catalog for a particular application.
3.B Combustion Air
These 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.
These units 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.
Combustion Air From Room In the United States,
the most common requirements specify that the space
shall communicate with the outdoors in accordance
Selkirk
PolyFlue
83x040 2ZDCPVCx
83x050 2ZDESx
83x050 2ZDESx
NovaFlex
Z-Dens
Page 18
HORIZONTAL INTAKE AND EXHAUST PVC VENT TERMINAL KITS
Size
2” PVC
3” PVC
4” PVC
6” PVC
Standard
Concentric
CA006000
Flush Mount
CA010100
Standard
CA005900
Concentric
239-44069-01
Flush Mount
CA010101
Standard
Flush Mount
CA010102
Standard
80
incl.
opt.
opt.
opt.
opt.
opt.
105
incl.
opt.
opt.
opt.
opt.
opt.
150
incl.
opt.
opt.
199/210
incl.
opt.
opt.
285
opt.
opt.
opt.
incl.
opt.
n/a
399
n/a
n/a
n/a
incl.
opt.
n/a
500
n/a
n/a
n/a
incl.
opt.
n/a
600
n/a
n/a
n/a
incl.
opt.
opt.
750
n/a
n/a
n/a
incl.
n/a
opt.
850
n/a
n/a
n/a
incl.
n/a
opt.
incl.
opt.
opt.
LAARS Heating Systems
with method 1 or 2, which follow. Where ducts are used,
they 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” (300mm) of the top and one commencing
within 12” (300mm) 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,
HORIZONTAL INTAKE AND EXHAUST PVC VENT TERMINAL KITS
2” PVC 3” PVC 4” PVC 6” PVC
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.
Method 2: One permanent opening, commencing
within 12” (300mm) 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.
Size
Concentric vent terminal = 10 ft. pipe length
incl.
Standard
opt.
Concentric
CA006000
opt.
Flush Mount
CA010100
Standard
CA005900
Concentric
239-44069-01
Flush Mount
CA010101
Standard
Flush Mount
CA010102
Standard
Table 7. PVC Vent Terminal Kits
PRO TECH (FasNSeal) HEAT FAB (Saf-T-Vent) Z FLEX (Z-Vent)
SIZE Boiler Flue Intake Air Boiler Intermediate Flue Intake Air Boiler Flue Intake Air
Adapter Termination Termination Adapter Adapter Termination Termination Adapter Termination Termination
399-600 F303759 FSBS4 FSAIH04 KB285600 9454BUREZ-1* 9492 9414TERM 2SVSLA04 2SVSTP04
FSRC4(R.C) 303888 5400CI 2SVSRCX04
750-850 F303759 FSBS6 FSAIH04
303888
Figure 14. Approved Stainless Terminations and Adapters
INSTALLATION STANDARDS
MATERIAL UNITED STATES CANADA
ABS ANSI/ASTM D1527
PVC, sch 40 ANSI/ASTM D1785 or D2665 Air pipe material must be chosen
CPVC, sch 40 ANSI/ASTM F441
Single wall galv. steel 26 gauge
based upon the intended application of the boiler.
2SVSTEX0490
Figure 15. Required Combustion Air Pipe Material
NEOT
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.
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 a horizontal wall
terminal, kit, See Table 7.
See Table 4 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 Figure 17)
Use ABS, PVC, CPVC or galvanized pipe for the
combustion air intake. (See Table 4.) The pipe should
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. Maximum linear pipe length
allowed is shown in Table 4. Subtract 5 allowable linear
ft. (1.5m) for every elbow used.
The connection for the intake air pipe is at the top of the
unit.
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.
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
3.C Venting
This unit is a Category IV appliance and may be
installed with PVC and CPVC that complies with ANSI/
ASTM D1785 F441, polypropylene that complies with
ULC-S636 Class IIb, or a stainless steel venting system
that complies with UL 1738 Standard. (See Table 6)
The unit’s vent can terminate through the roof, or
through an outside wall.
When using PVC/CPVC for vent material, venting
must be connected to the CPVC section included with
sizes 80-850. The CPVC vent section included with
the unit may be broken by CPVC ttings if necessary,
but never reduced in total length. See Table 4 to
select the appropriate vent pipe diameter. When using
polypropylene, all vent material must be produced by
the same manufacturer, and have a ULC-S636 rating.
All installations should be done following the vent
supplier’s recommended installation techniques.
If manufacturer’s instructions are not available
for the material used, follow the manufacturers
recommendations.
Route vent pipe to the heater as directly as possible.
Please see Table 4 on page 16 for proper diameter vs.
length allowed.
Page 19
WARNING
Failure to use polypropylene CPVC or stainless steel
venting for the rst 20” (285-600) / 30” (199 / 210)
of vent material or for any part of the venting that is
installed inside a closet may lead to property damage,
personal injury or death. The proper length of this
material is supplied with boiler. Boilers in the U.S. may
use pipe included with the boiler.
Failure to use the appropriate vent material,
installation techniques, glues/sealants could lead to
vent failure causing property damage, personal injury
or death.
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel® (polyphenolsulfone) in non-metallic
venting systems is prohibited and that covering nonmetallic vent pipe and ttings with thermal insulation is
prohibited.
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.
NOTE: The ue temperature of the unit 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 unit is installed
in an application where the ambient temperature
is elevated, and/or installed in a closet/alcove,
polypropylene, CPVC or stainless steel material is
required. If the system temperatures are unknown
at the time of installation, Class IIB or higher
venting material is recommended.
NOTE: 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 unit and drain
out thru the condensate trap. Horizontal portions of
the venting system must be supported to prevent
sagging and may not have any low sections that
could trap condensate. Seal all joints and provide
adequate hangers as required in the venting system
manufacturer’s Installation Instructions. The unit must
not support the weight of the vent pipe.
Page 20
INSTALLATION STANDARDS
MATERIAL UNITED STATES CANADA
Stainless Steel UL 1738 Venting must be ULC-S636 certied for use as
PVC, sch 40 ANSI/ASTM D1785 venting material. The venting material class must be
CPVC, sch 40 ANSI/ASTM F441 chosen based upon the maximum ue gas temperature
Polypropylene
ULC-S636 and the intended application of the boiler.
LAARS Heating Systems
Figure 16. Required Exhaust Vent Material
Venting Requirements Unique to Canada
These 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.
As a result, two items listed in the Installation Kit (Figure
10 and Figure 11) are not included with these units for
Canada (underlined):
In Canada, refer to CAN/CSA B199.1
*
*
Figure 17. Combustion Air and Vent Through Roof
REMARQUE : Acheminer le tube d’évent à l’appareil de
chauage le plus directement possible. Veuillez voir le
tableau 4 à la page 13 pour le bon diamètre vs. longueur
autorisée. Le tuyau d’évacuation doit pitch vers le haut,
vers la borne d’évent, pas moins de 1/4 “ par pied,
de sorte que les condensats courir vers l’ et appareil
écouler thru le réservoir des condensats. Portions
horizontales du système d’aération doit être soutenu
pour empêcher l’aaissement et peut ne pas avoir de
faibles sections qui pourraient piéger des condensats
IMPORTANT NOTE ABOUT COMMON VENTING: A
single vent that is shared by multiple units MUST be
engineered by a competent venting specialist, and
involves the selection of draft inducing equipment,
hardware and controls to properly balance ue gas
pressures. Do not common vent units unless the
vent system meets this requirement. These units
are never permitted to share a vent with Category I
appliances.
A exhaust vent terminal (not included)
B. air intake terminal
C. temperature/pressure gauge kit
D. circulator pump/wire harness (units with pump)
E. CPVC exhaust pipe section (80-500) (not incl.)
F. outdoor/system sensor kit
G. ow switch kit (399-850)
H. alternate size vent/terminal screens
J. exhaust vent adapter CPVC/ST ST (750-850)
It is the responsibility of the appropriately licensed
technician installing this unit 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
IMPORTANT! 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 unit: within
NEOT
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
Page 21
2 feet of the ue connection. There is no ue gas
sampling port internal to the unit, so one must be
installed in the vent system external to the unit. 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,
the manufacturer 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 by other means to ensure
the vent system remains sealed. (See Figure 18)
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 unit and not
collect anywhere in the vent system - including in the
ue gas sampling port.
An exhaust vent terminal must be installed. If an
exhaust vent terminal is not available with the certied
vent system, the manufacturer suggests the use of a
coupler tting from the certied vent system into which
the vent terminal screen, included with the unit and
shown in the Unpacking section, be installed. Be sure to
install and terminate both vent and combustion air pipes
per the Venting and Combustion Air section of the unit’s
instructions.
3.D Locating Vent and Combustion Air
Terminals
Side Wall Vent Terminal
The appropriate 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 points listed on the following page when installing
the terminal.
1. Figure 20 shows the requirements for mechanical
vent terminal clearances for the U.S. and Canada.
The outdoor models must be installed at least 10
ft (the vent pipe) from any door or window that
can be opened. The exhaust vent shall not be
under any overhang or roof. Use only the vent
components included with the boiler.
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.
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.
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
oers greater protection from wind related operating
issues.
Side Wall Combustion Air Terminal
The side wall combustion air terminal, or concentric
terminal must be used when the heater takes air from
a side wall. (See page 18 ) Contact manufacturer
for AL29-4C termination ttings. Consider the following
when installing the terminal. (See Figure 20 through
Figure 19.)
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 (2.1m) 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
(30cm) above grade, but the installer may
Figure 18. Test Port - ULC-S636 system
Page 22
determine it should be higher, depending upon
local conditions.
4. For concentric vent, follow instructions
included with vent kit.
5. Multiple vent kits should be installed such that the
horizontal distance between the outlet group and
the inlet group is 36” (90cm). (Figure 21.)
6. The vent outlet for models 199-285 must be no
lower than the center of the air inlet, and must be
at least 12” (30cm) away from the air inlet. Vent
outlets for models 399-850 must be at least 12”
above the top of the air inlet, and must be at least
36” (90cm) horizontally from the air inlet. (page
24.)
Vertical Vent Terminal
When the unit is vented through the roof, the vent must
extend at least 3 feet (0.9m) above the point at which
it penetrates the roof. It must extend at least 2 feet
(0.6m) higher than any portion of a building within a
horizontal distance of 10 feet (3.0m), and high enough
above the roof line to prevent blockage from snow.
The vent terminal included with the unit 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” (30cm) below the vent
terminal. (See Figure 17.)
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. (Figure 17.) The
opening on the end of the terminal must be at least 12”
(30cm) 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” (30cm) below
the vent terminal.
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
(begininning on 2nd page following):
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
LAARS Heating Systems
Figure 19. Multiple Side-Wall Terminals,
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 hard-wired 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
subdivision 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.”
NEOT
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
*When vent terminal is less than 10 feet (3m) horizontally
from a forced air inlet, the terminal must be at least 3 feet
(0.9m) above the air inlet. (US only)
Page 23
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 (30cm); 36 inches (91 cm)
opened Other than Direct vent: 4 ft (1.2m) below or to NT 80 only - 12 inches (30 cm)
side of opening; 1 ft (30cm) above opening
C= Clearance to permanently closed window See note 4 See note 5
D= Vertical clearance to ventilated sot located
above the terminal within a horizontal See note 4 See note 5
distance of 2 feet (61cm) from the center
line of the terminal
E= Clearance to unventilated sot 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: 12” (30cm) 80-285; 36” (91cm)
inlet to building or the combustion air inlet 399-850. Other than Direct vent: 4 ft (1.2m) below 36 inches (91 cm)
to any other appliance or to side of opening; 1 ft (30cm) above opening NT 80 only - 12 inches (30 cm)
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) (see note 3)
or balcony
Notes:
1. In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code.
2. In accordance with the current CAN/CSA-B149.1 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: Terminal must be placed such that it remains a minimum 12” above expected snow line. Local codes may have more
specic requirements, and must be consulted.
Figure 20. Combustion Air and Vent Through Side Wall
Page 24
150-285
Figure 21. Minimum Venting Distance
LAARS Heating Systems
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.
NEOT
HERM
Commercial Boilers and Water Heaters, 150 to 850 MBTU/h
Page 25
3.E Common Vent Test
NOTE: This section does not describe a method for
common venting these high eciency condensing units. It
describes what must be done when a unit is removed from
a common vent system. These units require special vent
systems and fans for common vent. Contact the factory if
you have questions about common venting these units.
NOTE: 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 and other deciencies which
could cause an unsafe condition.
3. Insofar as it is practical, close all building doors and
windows and all doors between the space in which the
appliances remaining connected to the common venting
system are located and other spaces of the building. Turn
on clothes dryers and any appliance 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 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
5 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
doors, windows, exhaust fans, replace dampers and any
other gas burning appliance to their previous conditions of
use.
7. Any improper operation of the common venting
system should be corrected so 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.
REMARQUE : Lorsqu’une chaudière existante est
supprimée d’un système de ventilation commun, le
système de ventilation commun est susceptible d’être
trop grande pour garantir une aération correcte des
appareils restant connecté à elle. Lors de la dépose
d’une chaudière existante, les étapes suivantes
doivent être suivies avec chaque appareil reste
connecté à la système de ventilation commun mis en
opération, alors que les autres appareils connectés
restants à la politique commune de système d’aération
ne sont pas en opération.
1.
Joint les ouvertures inutilisées dans le système de
ventilation commun.
Inspecter visuellement le système de ventilation
2.
à la taille correcte et espacement horizontal et
déterminer il n’y a pas de blocage ou de restriction,
de
fuite, de corrosion et d’autres lacunes que pourrait
causer une condition dangereuse
3.
Dans la mesure où cela est pratique, fermer
tous les bâtiments de portes et fenêtres et toutes
les portes entre l’espace dans lequel les appareils
connectés restants à la système de ventilation
commun
Allumer les sécheuses et tout appareil non connecté
au système de ventilation commun. Mettez sous
tension tous les ventilateurs d’échappement d’air, tels
que les hottes de cuisine et salle de bains exhausts,
an qu’ils fonctionnent à la vitesse maximum. Ne pas
faire fonctionner un ventilateur d’échappement d’été.
Fermer cheminée amortisseurs.
4.
inspecté. Suivez les instructions d’éclairage. Réglez
le thermostat de sorte que l’appareil fonctionnera en
continu.
5.
Test pour les pertes sur les projets d’ouverture de
secours de capot après 5 minutes de fonctionnement
du brûleur principal. Utilisez la amme d’une
allumette ou une bougie allumée, ou de la fumée
d’une cigarette, un cigare ou une pipe.
6.
reste connecté au système de ventilation commun
correctement évents lorsque testé comme décrit
ci-dessus, le retour des portes, des fenêtres,
ventilateurs d’échappement, amortisseurs de
cheminée et tout autre appareil de combustion du
gaz à leurs conditions d’utilisation précédente.
Tout fonctionnement incorrect du système de
7.
ventilation commun devrait être corrigée de sorte
que l’installation est conforme aux code de gaz
combustible National, ANSI Z223.1/NFPA 54 et/
ou CSA B149.1, Codes d’installation. Lors du
redimensionnement de toute portion de la système
de ventilation commun, le système de ventilation
commun doit être redimensionné à l’approche de la
taille minimale, déterminée en utilisant les tableaux
appropriés et des lignes directrices dans le National
sont situés et d’autres espaces du bâtiment.
Place dans le fonctionnement de l’appareil
Après qu’il a été déterminé que chaque appareil
Code de gaz combustible, ANSI Z223.1 NFPA 54 et/
ou CSA B149.1, Codes d’installation.
Page 26
LAARS Heating Systems
SECTION 4
GAS SUPPLY AND PIPING
All Installations must conform to the National Fuel
Gas Code ANSI Z223.1/NFPA54, and/or local codes.
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. Gas piping should
be supported by suitable hangers or oor stands, not
the appliance.
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. The unit 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. (3.2kPa). The minimum inlet gas
pressure is 4” W.C. (1.0kPa).
3. Refer to Table 8 to size the piping.
4. Run gas supply line in accordance with all
applicable codes.
5. Locate and install manual shuto 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 action of liqueed
petroleum gas.
8. The appliance and its individual shuto 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 (3.45kPa).
9. The unit must be isolated from the gas supply
system by closing its individual manual shuto
valve during any pressure testing of the gas
supply piping system at test pressures equal to or
less than 1/2 PSIG (3.45kPa).
10. The appliance and its gas connection must be
leak tested before placing it in operation.
11. Purge all air from gas lines.
WARNING:
Open ame can cause gas to ignite and result in
property damage, severe injury, or loss of life.
NOTE: This 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 units are equipped with low and high gas
pressure switches that are integrally vent limited. These types
of devices do not require venting to atmosphere.
NATURAL GAS
REQUIRED
SIZE
150 150
199/210 199/210
285 285
399 399
500 500
600 600
750 750
850 850
CU FT
/
TO SIZE PIPING:
HR.
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 9. Align total length (pipe and ttings) on left
side column of Table 10 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 8. To Size Your Piping
EQUIVALENT LENGTHS OF STRAIGHT PIPE FOR TYPICAL SCH 40 FITTINGS
NOMINAL PIPE SIZE
FITTING 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
LINEAR FEET
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
T able 9. Equivalent Lengths of Straight Pipe, SCH 40
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
T able 10. Nominal Pipe Size @ 0.30” W.C. Press Drop
SCHED 40 METAL PIPE CAPACITY FOR 1.50 SPECIFIC GRAVITY
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.
T able 1 1. Nominal Pipe Size @ 0.11” W.C. and 0.5” Press Drop
UNDILUTED PROPANE
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