NTI Lx150-800 User manual

Trinity Lx
Model Numbers: Lx150-800
Version Date: 2010-07-01
INSTALLATION AND OPERATION INSTRUCTIONS FOR
TRINITY LX SERIES BOILERS AND WATER HEATERS
This manual to be read in conjunction with the following documents which
provide specific instructions for controller setup, plumbing and wiring:
Appendix A - Controller and Touchscreen Display Instructions
Appendix B - Boiler Applications: Plumbing and Wiring
Appendix C - Water Heater Applications: Plumbing and Wiring
TABLE OF CONTENTS
1.0
INTRODUCTION................................................................................................................3
2.0
SPECIFICATIONS ..............................................................................................................6
3.0
APPLIANCE LOCATION...................................................................................................7
4.0
GENERAL VENTING.......................................................................................................12
5.
0 VENT/AIR-INTAKE TERMINATION CLEARANCES..................................................24
6.0
CONDENSATE DRAIN....................................................................................................28
7.0
INSTALLING GAS PIPING..............................................................................................29
8.0
LIGHTING THE APPLIANCE .........................................................................................31
9.0
GAS VALVE AND BURNER SET-UP ............................................................................33
10.0
WIRING SCHEMATICS...................................................................................................39
11.0
INSTALLATION CHECKLIST........................................................................................43
12.0
ANNUAL MAINTENANCE AND INSPECTION...........................................................45
13.0
PARTS LIST ......................................................................................................................47
14.0
TROUBLESHOOTING .....................................................................................................57
HAZARD SYMBOLS AND DEFINITIONS
Danger Sign: I
ndicates a hazardous situation which, if not avoided, will
result in serious injury or death.
Warning Sign: I
ndicates a hazardous situation which, if not avoided,
could result in serious injury or death.
Caution Sign plus Safety Alert Symbol: I
ndicates a hazardous situation
which, if not avoided, could result in minor or moderate injury.
Caution Sign without Safety Alert Symbol: Indicates a
hazardous
situation which, if not avoided, could result in property damage.
Notice Sign: I
ndicates a hazardous situation which, if not avoided,
could result in property damage.
This Appliance must be installed by a licensed and trained Heating
Technician or the Warranty is Void. Failure to properly install this
unit may result in property damage, serious injury to occupants, or possibly death.
®
NEW
FEATURES
Second Central Heat Input
Internal Lead-Lag Control
System Sensor
Modulation Sensor Alternatives
Warm Weather Shutdown
BONUS
Night Time Setback
(Time of Day)
Lx800 Only
Lx
8
00

Trinity Lx │Installation and Operation Instructions Lx Series
2
Read Before Proceeding
If you do not follow these instructions exactly, a fire or explosion may result causing
property damage, serious injury or death.
FOR YOUR SAFETY, READ BEFORE OPERATING_
A) This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the
burner. Do not try to light the burner by hand.
B) BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electric switch.
• Do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
C) Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or
turn by hand, don't try to repair it, call a qualified service technician. Force or attempted repair may result
in a fire or explosion.
D) Do not use this appliance if any part has been under water. Immediately call a qualified service technician
to inspect the appliance and to replace any part of the control system and any gas control which has
been under water.
OPERATING INSTRUCTIONS_
1. STOP! Read the safety information above very carefully.
2. Set the thermostat to lowest setting. Turn off all electric power to the appliance.
3. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the
burner. Do not try to light the burner by hand.
4. Turn the manual gas valve to the OFF position. Remove front access panel.
5. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas,
STOP! Follow “B” in the safety information above. If you don't smell gas, go to the next step.
6. Turn the manual gas valve ON. Wait an additional five (5) minutes smelling for gas.
7. Replace the front access panel.
8. Set thermostat to highest setting. Turn on all electric power to the appliance.
9. Ignition sequence is automatic. Combustion will occur after a brief fan purge.
10. If ignition does not occur, follow the instructions “To Turn Off Gas To Appliance” and call your service
technician or gas supplier.
TO TURN OFF GAS TO THE APPLIANCE_
1. STOP! Read the safety information above very carefully.
2. Turn off all electric power to the appliance
3. Turn the manual gas valve to the OFF position
Crystalline Silica - Certain components confined in the combustion chamber may
contain this potential carcinogen. Improper installation, adjustment, alteration, service or
maintenance can cause property damage, serious injury (exposure to hazardous materials) or death. Refer to
Section 12.0 for information on handling instructions and recommended personal protective equipment.
Installation and service must be performed by a qualified installer, service agency or the gas supplier (who must
read and follow the supplied instructions before installing, servicing, or removing this appliance. This appliance
contains materials that have been identified as carcinogenic, or possibly carcinogenic, to humans).
Void Warranty - This Appliance must have water flowing through it whenever the
burner is on or it will damage the unit and void the warranty. Failure to follow these
instructions may result in serious injury or death.

Lx Series Installation and Operation Instructions │Trinity Lx
3
1.0 INTRODUCTION
Installation and Operation Instructions – These instructions apply to the installation
and operation of Trinity Lx150-800 units and covers instructions that are common-to-
both boiler and water heater applications. Troubleshooting instructions for the controller and display are
covered in Appendix A. Appliance-specific plumbing and wiring instructions for Boilers and Water Heaters
are covered in Appendix B and C, respectively.
Terminology – The following terms in the instruction manuals are used to differentiate between which
instructions are common-to-both and which are appliance-specific. The term "APPLIANCE" applies to both
kinds of water heating appliances (boilers and water heaters) and is used when conveying instructions which
are common-to-both. The term "BOILER" or "WATER HEATER" is used when conveying instructions
which are appliance-specific or specific to one or the other, but not both.
Table 1-1 Instruction Manuals
Appliance Model No. Common-to-Both
(Trinity Lx Series) Appliance-Specific (Application Based)
Boiler Lx150-800 Installation and Operation
Instructions
Appendix A
Controller and
Touchscreen Display
Instructions
Appendix B
Boiler Applications:
Plumbing and
Wiring Instructions
n/a
Water
Heater Lx200-800 Installation
and Operation
Instructions
Appendix A
Controller and
Touchscreen Display
Instructions
Appendix B
Boiler Applications:
Plumbing and Wiring
Instructions
Appendix C Water
Heating Applications:
Plumbing and Wiring
Instructions
Notes
1
The conversion kit is required to convert the Appliance so it will safely operate with Propane Gas (Lx150-400).
2
Do not convert the Lx800 to Propane (LP). Operate with Natural Gas only.
General Installation Requirements
The installation of your NTI Trinity Lx gas appliance must conform to the requirements of this manual, your
local authority, and the National Fuel Gas Code ANSI Z223.1 and or CAN/CGA B149 Installation Codes.
Where required by the Authority, the installation must conform to the standard for “Controls and Safety Devices
for Automatically Fired Boilers ANSI/ASME CSD-1.
This document pertains to the correct installation and operation of NTI Trinity boiler models Lx150, Lx150E,
Lx200, Lx300, Lx400 and Lx800. The instructions detailed in this document supersede any and all previous
instructions provided by NTI, written or otherwise. Each unit is provided with various manuals and a Natural to
LP Conversion Kit for applicable models. Refer to notes and list of Instruction Manuals in Table 1-1.
The Lx800 is not approved for operation with Propane (LP Gas). Failure to comply with
these instructions will result in property damage, serious injury or death.
Read and understand this entire document prior to proceeding with the installation of the
Trinity Lx. Failure to follow the instructions outlined in this document will result in
property damage, serious injury or death.
User Responsibilities
This appliance must be installed and serviced by a qualified installer or service technician. This appliance must
be serviced and inspected annually when operating in normal residential applications. Demanding applications
or extreme conditions (i.e. commercial) may require more frequent service and inspection. As the User/Owner of
this equipment, you are responsible for ensuring the maintenance is performed at the required intervals.
Failure to have the appliance properly serviced and inspected on a regular basis by a
qualified service technician may result in property damage, serious injury or death.
Failure to keep the Vent and Combustion Air Intake clear of ice, snow, and other debris
may result in property damage, serious injury, or death.

Trinity Lx │Installation and Operation Instructions Lx Series
4
Installer Responsibilities
A qualified installer is a licensed person who has appropriate training and a working knowledge of the applicable
codes, regulations, tools, equipment and methods necessary to install a boiler or water heater. The Installer
assumes all responsibility for a safe installation and that it meets the requirements of the Trinity instruction
manuals, as well as National and local codes. It is also the installer’s responsibility to inform the User/Owner of
their obligation with respect to the description under “User Responsibilities”. Failure to follow this warning
could result in fire, serious injury, or death.
ATTENTION: LIQUEFIED PETROLEUM (LP) PROPANE
The Trinity Lx is factory set to operate with Natural Gas. BEFORE OPERATING WITH PROPANE,
the specified LP Conversion Kit must be installed to convert the appliance so it will operate safely with
LP Propane. The Lx800 operates with Natural Gas only, DO NOT convert to Propane. Listed below
are the NTI applicable models and their corresponding Natural to LP Propane Conversion Kit number.
Liquefied Petroleum (LP) propane gas is heavier than air; therefore, it is imperative that your Trinity
Lx appliance is not installed in a pit or similar location that will permit heavier than air gas to collect.
Local Codes may require appliances fueled with LP gas be provided with an approved means of
removing unburned gases from the room. Check your local codes for this requirement.
Natural to LP Propane Conversion Kit _
NTI Series Model Number Kit Number
Trinity Lx 150, 150E, 200, 300 82650-1
Trinity Lx 400 83017-1
Failure to use the appropriate Natural to LP Conversion Kit when operating the Trinity Lx
with Propane will result in extremely dangerous burner operation leading to property
damage, serious injury or death. Refer to section titled ATTENTION: LIQUEFIED PETROLEUM (LP)
PROPANE for applicable models and corresponding conversion kit numbers.
Appliance Vent / Air-Intake Piping
The Trinity Lx is a “Direct Vent” appliance requiring a “Special Venting System”. Vent
and Combustion-Air Intake piping must be piped to the outdoors, using the vent material
and rules outlined in these instructions. Failure to follow instructions will result in serious injury or death.
New Features
Second Central Heat Input - The Trinity Lx can be used as a stand alone unit with a lone heat input or with two
heat inputs. To configure units for two heat inputs refer to "Second Central Heat Input vs Multiple Boiler
Application Settings" in Appendix A and "Stand Alone Boiler Applications" in Appendix B.
Internal Lead-Lag Control - The Trinity Lx controller has the internal capacity to stage or lead-lag up to 8
boilers or water heaters configured in a cascade by "daisy chaining" the controller units together. Refer to
"Second Central Heat Input vs Multiple Boiler Application Settings" in Appendix A for controller setup and
Appendix B or C for application specific plumbing and wiring instructions.
Modbus Address - In Lead Lag installations, each controller’s Modbus Address must be
assigned by the installer. Refer to "System Identification & Access" in Appendix A.
System Sensor - Each LX is provided with an optional system water temperature sensor that allows the system
supply or return temperature to be regulated directly. Refer to "Low Voltage Connections" in Appendix B. Not
used for Water Heater Applications.
Modulation Sensor Alternatives - New LX models provide increased accuracy and control of a unit’s water
temperature by allowing installers to select the desired modulation sensor for a given demand. Refer to
"Modulation Sensor" in Appendix B or C.
Warm Weather Shutdown - When enabled, this feature will "prevent" Central Heat operation when the outdoor
temperature exceeds the WWSD setpoint and "permit" Central Heat operation if the outdoor temperature drops
below the WWSD setpoint by 4
o
F. For set up details refer to the "Warm Weather Shutdown Configuration" in
Appendix A - Controller and Touchscreen Display. Not used for water heater applications.

Lx Series Installation and Operation Instructions │Trinity Lx
5
IN THE STATE OF MASSACHUSETTS ONLY
(a) For all horizontally vented gas fueled equipment installed in every dwelling, building or structure used in
whole or in part for residential purposes, including those owned and operated by the Commonwealth and
where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the
venting, including but not limited to decks and porches, the following requirements shall be satisfied:
1. INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall
horizontal vented gas fueled equipment, the installing plumber or gas fitter shall observe that a hard wired
carbon monoxide detector with an alarm and battery back-up is installed on the floor level where the gas
equipment is to be installed and on each additional level of the dwelling, building or structure served by
the equipment. It shall be the responsibility of the property owner to secure the services of qualified
licensed professionals for the 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 detector with alarm and battery back-up may be installed on
the next adjacent floor level.
b. In the event that the requirements of this subdivision can not be met at the time of completion of
installation, the owner shall have a period of 30 days to comply with the above requirements;
provided, however, that during said 30 day period a battery operated carbon monoxide detector with
an alarm shall be installed.
2. APPROVED CARBON MONOXIDE DETECTORS Each carbon monoxide detector as required in
accordance with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS
certified.
3. SIGNAGE A metal or plastic identification 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 the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no
less than one-half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL
OBSTRUCTIONS” (plate included with appliance).
4. INSPECTION The state or local gas inspector of the side wall horizontally vented gas fueled equipment
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 through 4.
(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current
edition of NFPA 54 as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure
separate from the dwelling, building or structure used in whole or in part for residential purposes.
(c) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT VENTING SYSTEM PROVIDED:
When the manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting
system design or venting system components with the equipment, the instructions provided by the
manufacturer for installation of the equipment and the venting system shall include:
1. Detailed instructions for installation of the venting system design or the venting system components; and
2. A complete parts list for the venting system design or venting system.
(d) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED:
When the manufacturer of a Product Approved side wall horizontally vented gas fueled equipment does not
provide the parts for venting the flue gases, but identifies “special venting systems”, the following requirements
shall be satisfied by the manufacturer.

Trinity Lx │Installation and Operation Instructions Lx Series
6
2.0 SPECIFICATIONS
Table 2-1 Specifications
DESCRIPTION Lx150 Lx150E Lx200 Lx300 Lx400 Lx800
CSA Input Modulation
1
btu/hr [kw] 25,000-150,000
2
[7.3-44.0]
25,000-150,000
[7.3-44.0] 25,000-199,000 [7.3-58.3] 55,000-275,000 [16.1-80.5] 75,000-399,000 [21.9-117] 160,000-800,000 [46.9-234]
DOE Heating Capacity
1, 3
btu/hr [kw] 136,000
[39.8] 139,000 [40.7] 182,000 [53.3] 251,000 [73.5] 374,000 [109.6] 749,000 [219.5]
Net I=B=R Rating
1,3
btu/hr [kw] 118,000 [34.8] 121,000 [35.4] 158,000 [46.3] 213,000 [62.4] 325,000 [95.2] 650,000 [190.5]
DOE AFUE
3
% 95.1 97.0 95.1 95.1 94.0
6
94.0
6
Recovery Rating @
100
o
F Rise, gal/hr - - 224 310 450 902
Water Connections - NPT, in. 1
4
1 1 1-1/4 1-1/4 2
Gas Connection - NPT, in. 1/2 1/2 1/2 1/2 3/4 1
Vent/Air-Intake Pipe Dia.
respectively, in. [mm]
5
3
7
or 4
[ 76 or 102] 3
7
or 4
[ 76 or 102] 3
7
or 4
[ 76 or 102] 4 or 6
[102 or 152] 4 or 6 [102 or 152] 4 or 6
8
[102 or 152]
Vent/Air-Intake,
Max. Length, ft. [m] 105
7
[32] 105
7
[32] 105
7
[32] 100
[30.5] 100 [30.5] 100
9
[30.5]
Dimensions H x W x D
in. [mm] 29.5x17x18.5 [749x432x470] 29.5x17x18.5 [749x432x470]
29.5x17x18.5
[749x432x470] 36x17x21.5 [915x432x546] 36x17x24 [915x432x610] 37x17x63.5 [938 x 432 x 613]
Approx. Appliance Weight
with Water, lbs [kg] 100 [45.3] 125 [56.7] 125 [56.7] 180 [31.7] 225 [102] 450 [104]
Electrical Rating 120V / 1 Phase / 60 Hz / 12A
Notes:
1
Listed Input and Output ratings are at minimum vent lengths at Sea Level. Numbers will be lower with longer venting
and/or altitudes greater then 2000 feet [610 m].
2
The maximum output when operating on LP-Gas is limited to 145,000 Btu/hr [42.5 kW].
3
Based on rating plate input capacities, using standard test procedures prescribed by the U.S. Department of Energy.
Ratings have been confirmed by AHRI (GAMA), excluding Lx400 and Lx800.
4
Units sold in Canada are 3/4” NPT.
5
Trinity Lx require a special venting system, use only vent materials and methods detailed in these instructions.
6
Steady-State Efficiency Rating.
7
Models Lx150-200, when using 3" venting on LP, max. equivalent length = 50 feet.
8
Only 6” exhaust vent is permissible for the Lx800. Air intake pipe can be 4” or 6”.
9
Model Lx800 operates with Natural Gas only.
Wall mounted units requires two people to lift the appliance into place or property damage
and personal injury may result.
High Altitude Operation
The Trinity is designed to operate at its maximum listed capacity in installations less than or equal to 2000 ft
[610 m] above Sea Level. Since the density of air decreases as elevation increases, maximum specified capacity
should be de-rated for elevations above 2000 ft [610 m] in accordance with Table 2-2.
Table 2-2 De-rate % for High Altitudes
Elevations 2000 ft [610 m] 3000 ft [914 m] 4000 ft [1219 m] 4500 ft [1372 m] 5000 ft [1524 m]
In Canada
1
de-rate by 5% de-rate by 5% de-rate by 5% de-rate by 5% de-rate % may vary
In USA
2
- de-rate by 4% de-rate by 8% - de-rate by 12%
Notes:
1
Canada: Altitudes between 2000-4500 ft [610-1372 m], de-rate by 5%. Consult local authorities for de-rating capacities
for altitudes above 4500 ft [1372 m].
2
USA: De-rate capacity by 4% for every 1000 ft [305 m] over 2000 ft [610 m].
Combustion – At elevations above 2000 feet, the combustion of the appliance must be
checked with a calibrated combustion analyzer to ensure safe and reliable operation. It is
the Installers responsibility to check the combustion and to adjust the combustion in accordance to
Section 9.0. Failure to follow these instructions may result in property damage, serious injury, or death.

Lx Series Installation and Operation Instructions │Trinity Lx
7
3.0 APPLIANCE LOCATION
In all cases, the Trinity Lx must be installed indoors in a dry location where the ambient temperature must be
maintained above freezing and below 100°F [38°C]. Gas components must be protected from dripping, spraying
water, or rain during operation and servicing. Consider the proximity of system piping, gas and electrical supply,
condensate disposal drain, and proximity to vent termination when determining the best appliance location.
Water or flood damaged components must be replaced immediately with new factory-
approved components as failure to do so may result in fire, serious injury, or death.
Floor Mounting
The Trinity Lx can be mounted directly on combustible flooring, with the exception of carpeting. Installing the
appliance on carpeting is not permissible. Ensure the appliance is mounted above any anticipated flood level.
Models Lx150-400 come equipped with stationary, low profile legs. The Lx800 has factory supplied/field
installed leveling legs. Once the unit is removed from the pallet, thread the leveling legs into the allocated
threaded inserts in the bottom of the unit.
Appliance Area Ventilation Air Openings
If appliance area clearances are less then the recommended clearances specified in Table 3-1, the appliance area
must be ventilated. Each ventilation air opening must meet the minimum requirements of 1 in
2
per 1000 Btu/hr,
but not less then 100 in
2
. The lower ventilation opening must be located within 6” of the floor while the upper
opening must be located 6” from the top of the space. The Lx800 has an optional Indoor Combustion Air Kit
that can be installed in lieu of direct vent air intake piping. Note that the Indoor Combustion Air option is not to
be used in conjunction with closet or alcove installations. See "Mechanical Room Installations" below.
If the "Appliance Area" does not meet all of the recommended clearances listed in Table
3-1, it is considered a Closet or Alcove. In US / Canada, closet and alcove installations
require approved CPVC vent pipe, fittings, cements, and primers. See Table 4-3 for a list of approved materials.
Closet Installations
For closet installations, it is necessary to provide two ventilation air openings as shown in Figure 3-1(a), (b) and
(c), each providing a minimum area equal to 1 in
2
per 1000 Btu/hr, but not less then 100 in
2
and within 6” of the
top and bottom of the closet door. See Table 3-1for minimum recommended clearances.
Alcove Installations
Alcove installations have the same minimum clearances as closet installations, except the front must be
completely open to the room at a distance no greater then 18” [457 mm] from the front of the appliance and the
room is at least three (3) times the size of the alcove. Provided these conditions are met, the appliance requires
no extra ventilation air openings to the space. See Table 3-1for minimum recommended clearances.
Residential Garage Installations
When installed in a residential garage, mount the appliance a minimum of 18” [457 mm] above the floor. Locate
or protect the appliance so it cannot be damaged by a moving vehicle. Check with your local authorities for
other possible regulations pertaining to the installation of an appliance in a garage.
Mechanical Room Installations (Commercial)
The Trinity Lx800 is certified for use as a Direct Vent System, where flue gas and combustion air piping are
connected directly to the appliance. In addition, it is the only Lx model certified for use with an Indoor
Combustion Air System where flue gas piping is connected directly to the appliance, but combustion air is
drawn directly from the room. Room supplied combustion air systems are subject to additional codes
requirements such as pre-ignition interlocks with motorized dampers or auxiliary proving circuits when
operating in rooms with mechanical exhaust fans. See Table 4-1 for combustion air contamination sources to
avoid, Table 4-5 for a list of design considerations and installation guidelines, and Figure 4-13 for Kit details.
Wall Mounting Installations (Optional)
Lx150-400 models are shipped with wall mounting brackets to provide installers with the option of wall
mounting the appliance. Lx800 is not available as a wall mountable unit. Refer to Figures 3-3(a) and 3-3(b) for
instructions and illustrations on wall mounting applicable models. Note that Water Heaters require "Mandatory
Wall Mounting Protection". Refer to Section 1.0 in Appendix C, "Water Heater Applications: Plumbing &
Wiring Instructions" for further details.

Trinity Lx │Installation and Operation Instructions Lx Series
8
Figure 3-1(a) Lx150-200 Models
Closet Installation, Minimum Clearances
Figure 3-1(b) Lx300-400 Models
Closet Installation, Minimum Clearances
Closet/alcove installations in US and Canada require approved CPVC vent and air-inlet
pipe, fittings, cements and primers (Table 4-3). Failure to comply may result in damage or
serious injury.
Ventilation Air Openings
are not required if the
appliance area meets
the listed Recommended
Clearances in Table 3-1.
Top 12” [305 mm]
6” [152 mm] max. above vent opening
Front 6” [152 mm] - Boilers
Front 36” [915 mm] - Water Heaters Left Side 12” [305 mm]
Right Side 12” [305 mm]
6” [152 mm] max. below vent opening
Ventilation Air Opening
1 in
2
per 1000 Btu/hr, min. 100 in
2
Ventilation Air Opening
1 in
2
per 1000 Btu/hr, min. 100 in
2
Removable Surface or Closet Door
Piping must be CPVC
1” [25 mm] clearance for
hot water and vent pipes
Ventilation Air Openings
are not required if the
appliance area meets
the listed Recommended
Clearances in Table 3-1.
Top 12” [305 mm]
Removable Surface or Closet Door
Ventilation Air Opening
1 in
2
per 1000 Btu/hr, min. 100 in
2
Ventilation Air Opening
1 in
2
per 1000 Btu/hr, min. 100 in
2
6” [152 mm] max. above vent opening
6” [152 mm] max. below vent opening
Right Side 4” [102 mm]
Left Side 12” [305 mm]
Front 6” [152 mm] - Boilers
Front 36” [915 mm] - Water Heaters
Piping must be CPVC
1” [25 mm] clearance for
hot water and vent pipes

Lx Series Installation and Operation Instructions │Trinity Lx
9
Figure 3-1(c) Lx800 Model
Closet Installation, Minimum Clearances
Table 3-1 Minimum Clearances for Installation and Service Dimensions - inches [mm]
Model No. Clearances Front Top Left Side Right Side Rear Flue Pipe
Minimum 24 [610]
1,3
12 [305] 12 [305] 4 [102] 0 1 [25]
Trinity Lx150-200 Recommended 24 [610] 24 [610] 24 [610]
2
4 [102] 0 1 [25]
Minimum 24 [610]
1,3
12 [305] 12 [305] 12 [305] 0 1 [25]
Trinity Lx300-400 Recommended 24 [610] 24 [610] 24 [610]
2
12 [305] 0 1 [25]
Minimum 24 [610]
1,3
12 [305] 24 [610] 4 [102] 14 [356] 1 [25]
Trinity Lx800
4
Recommended 24 [610] 24 [610] 30 [762] 24 [610] 18 [458] 1 [25]
Notes:
1
6” if surface is removable allowing 24” [610 mm] clearance (i.e. closet installation). See Ventilation Air Opening
dimensions in Figure 3-1.
2
Clearances can be as low as 12” [305 mm] if the right side has a clearance of 24” [610 mm].
3
Water Heaters require a minimum clearance of 36” [915 mm] in front for burner access (Lx200-800).
4
For the Lx800, ensure rear of unit is accessible for wiring and flue gas testing.
Front 24” [610 mm] - Boilers
Front 36”
[915 mm]
-
Water Heaters
Left Side 24”
[610 mm]
Right Side
4” [102 mm]
6” [152 mm]
max. below
vent opening
Top
12”
[305 mm]
1” [25 mm]
clearance for
hot water and
vent pipes
6” [152 mm]
max. above
vent opening
Removable Surface
or Closet Door
Ventilation Air Opening
1 in
2
per 1000 Btu/hr,
min. 100 in
2
Ventilation Air Opening
1 in
2
per 1000 Btu/hr,
min. 100 in
2
Ventilation Air Openings
-
Openings are not required if
the appliance area meets the
Recommended Clearances in
Table 3-1.
Rear 14”
[356 mm]
Access
- Ensure rear of unit is
accessible for wiring and flue
gas testing
. See Table 3
-
1.

Trinity Lx │Installation and Operation Instructions Lx Series
10

Figure 3-2(a) Lx150-200 Models
Wall Mounting Installations
 Remove the upper wall mount bracket from the
back of the appliance.
Failure to follow instructions
may
result in fire, serious injury, or death.
This unit requires two people to lift it
or damage and injury may result.
 Secure the upper wall mount bracket to a solid
wall using field supplied lag screws (anchors
when mounting on a concrete wall) that are
adequate to support the weight of the
appliance. Ensure the bracket is mounted in
the level position. Refer to Table 2-1
Specifications for appliance weight.
 Mount the appliance to the bracket by aligning
the slots in the back of the appliance with the
hooks protruding from the wall bracket. The
top of the slots must rest at the bottom of the
groove in the hooks of the wall mount bracket.
 Pull the bottom of the unit away from the wall
to allow the installation of the lower wall
mount bracket (included with appliance). The
bracket will snap into place using the slots
provided in the bottom of the unit (ensure the
snaps lock into place, once installed the bracket
should not be easily removed).
Water Heaters require "Mandatory Wall Mounting Protection". Refer to Section 1.0 in
Appendix C, "Water Heater Applications: Plumbing & Wiring Instructions".









Ensure that the top of each
slot rests on the bottom of the
grooves in the wall bracket.

Lx Series Installation and Operation Instructions │Trinity Lx
11
Figure 3-2(b) Lx300-400 Models
Wall Mounting Installations
 While leaving the upper bracket intact (A),
remove the wall mount bracket attached to the
Failure to follow instructions
may
result in fire, serious injury, or death.
This unit requires two people to lift
it
or damage and injury may result.
bottom-back of the appliance (B). Save the
mounting hardware for Step 4.
 Secure the wall mount bracket, removed from
the bottom of the boiler in Step 1, to a solid
wall using field supplied lag screws (anchors
when mounting to a concrete wall) that are
adequate to support the weight of the appliance
(refer to Table 2-1 Specifications). Ensure the
wall mount bracket is mounted level and flush
to the wall with mounting holes on the bottom,
flange pointed upward and angled away from
the wall.
 Mount the appliance to the wall by aligning the
upper bracket (A) with the wall mount bracket
(B). Slide the upper bracket down over the
wall mount bracket until it hooks.
 Once the appliance is resting securely on the
upper bracket, secure the bottom bracket to the
underside of the appliance using the mounting
hardware removed in Step 1; then, anchor the
bottom bracket to the wall as shown.
Water Heaters require "Mandatory Wall Mounting Protection". Refer to Section 1.0 in
Appendix C, "Water Heater Applications: Plumbing & Wiring Instructions".






Ensure that the
upper bracket
on the back of
the appliance
(A) slides down
over the wall
mount bracket
(B) and rests
securely on it.



A
B
B



B
A

Trinity Lx │Installation and Operation Instructions Lx Series
12
4.0 GENERAL VENTING
The Trinity Lx is a “Direct Vent” appliance requiring a “Special Venting System” designed for pressurized
venting. Both the Vent and Air-Intake piping must be piped to the outdoors, using the vent material and rules
outlined in this section. Under no conditions may this unit vent gases into a masonry chimney, unless it is
vacant, and utilizes the approved venting material and rules described in this section. Installations must comply
with the National Fuel Gas Code, ANSI Z223.1 (U.S.) or CSA B149.1 (Canada) and local requirements.
Vent and Air-Intake to be piped separately. The Trinity Lx cannot share a common vent or
air-intake with multiple appliances. Failure to comply will result in serious injury or death.
Combustion Air-Intake Contamination
Be careful not to locate the Air-Intake termination in an area where contaminants can be drawn in and used for
combustion. Combustion air containing dust, debris or air-borne contaminants will drastically increase the
required maintenance and may cause a corrosive reaction in the Heat Exchanger which could result in premature
failure, fire, serious injury, or death. See Table 4-1 for a list of areas to avoid when terminating air-intake piping:
Table 4-1 Corrosive Products and Contaminant Sources
Products to Avoid Contaminated Sources to Avoid
Antistatic fabric softeners, bleaches, detergents, cleaners Laundry facilities
Perchloroethylene (PCE), hydrocarbon based cleaners Dry cleaning facilities
Chemical fertilizer, herbicides/pesticides, dust, methane gas Farms or areas with livestock and manure
Paint or varnish removers, cements or glues, sawdust Wood working or furniture refinishing shops
Water chlorination chemicals (chloride, fluoride) Swimming pools, hot tubs
Solvents, cutting oils, fiberglass, cleaning solvents Auto body or metal working shops
Refrigerant charge with CFC or HCFC Refrigerant repair shops
Permanent wave solutions Beauty shops
Fixer, hydrochloric acid (muriatic acid), bromide, iodine Photo labs, chemical / plastics processing plants
Cement powder, crack fill dust, cellulose, fiber based insulation Concrete plant or construction site
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this
or any other appliance. Failure to follow instructions may result in serious injury or death.
Flammable Solvents and Plastic Piping
Due to the extremely flammable characteristics of most glues, cements, solvents and primers used in the process
of joining plastic vent and air-inlet pipe, explosive solvent vapors must be evacuated from the vent and air-intake
prior to start-up. Avoid using excess cement or primer that may lead to pooling inside the pipe assembly. Freshly
assembled piping assembly should be allowed to cure for a minimum of 8 hours before applying power to the gas
fired appliance. Refer to Mandatory Pre-commissioning Procedure for Plastic Venting in this section.
Flammable Cements and Primers – It is the installers’ responsibility to familiarize
themselves with the hazards associated with explosive solvents and to take all precautions
to reduce these risks. Failure to follow these instructions can cause explosions, property damage, injury or death.
Near Appliance Vent/Air-Intake Piping
Each Trinity Lx is equipped with a short piece of approved CPVC vent pipe. Insert one end into the appliance
flue outlet adapter and cement the other to field venting (see Table 4-3 for approved venting material). The
CPVC vent pipe should extend fully into the appliance flue outlet adapter (see Table 4-2). DO NOT insert PVC
pipe directly into the flue outlet connection as it can deform from the clamping force of the gear clamp. Ensure
that the venting system does not apply a load or strain on the appliance flue outlet adapter. The manufacturer
recommends using two elbows to create a “swing joint” to reduce potential strain on vent piping and cemented
joints. See Figures 4-1 through 4-3 for illustrations.
Gasket Seating - Improper seating can cause leakage and eventual failure of the sealing
gasket. Failure to follow these instructions may result in serious injury or death.

Lx Series Installation and Operation Instructions │Trinity Lx
13
Figure 4-1(a) Lx150-200 Model Figure 4-1(b) Lx150-200 Model
Near Appliance Venting (CPVC) Near Appliance Venting (PVC)
Figure 4-2(a) Lx300-400 Models Figure 4-2(b) Lx300-400 Models
Near Appliance Venting (CPVC) Near Appliance Venting (PVC)


Air-Inlet - check with applicable local codes for acceptable pipe material.
In Canada, the first 3 ft(915 mm) of vent piping must be readily accessible for inspection.
Flue Outlet
Stainless Steel Adapter
(factory supplied)
Exhaust Vent
3” CPVC
Swing Joint
to attain slope in
horizontal runs
Air Inlet
3” Pipe *
Coupling
3” Removable
(field supplied)
Air
-
Inlet
4” Pipe *
Swing Joint
to attain slope in
horizontal runs
Exhaust Vent
4”/6” PVC
Flue Outlet
Stainless Steel Adapter
(factory supplied)
Coupling
4” Removable
(factory supplied)
supplied)
90
o
elbow typical, or tee and
drain cap option for easy cleanouts
Air Inlet
3” Pipe *
Coupling
3” Removable
(field supplied)
Swing Joint
to attain slope in
horizontal runs
Exhaust Vent
- 3” PVC,
(check local codes and
Table 4-3)
Coupling 3” PVC
Flue Outlet
Stainless Steel
Adapter (factory
supplied)
Transition Piece
3” CPVC, minimum 5”
long (factory supplied)
Mandatory Vent
Pipe
Transition Piece
See Table 4
-
2.
Air
-
Inlet
4” Pipe *
Swing Joint
to attain slope in
horizontal runs
Coupling
4”/6”x4” PVC
Flue Outlet
Stainless Steel Adapter
(factory supplied)
Coupling
4” Removable
(factory supplied)
supplied)
Exhaust Vent
4”/6” PVC (check local
codes and Table 4-3)
Trans
ition Piece
4” CPVC, minimum 4”
long (factory supplied)
90
o
elbow typical, or tee and
drain cap option for easy cleanouts
Mandatory Vent
Pipe
Transition Piece
See Table 4
-
2.

Trinity Lx │Installation and Operation Instructions Lx Series
14
Figure 4-3(a) Lx800 Figure 4-3(b) Lx800
Near Appliance Venting (CPVC) Near Appliance Venting (PVC)


Air-Inlet - check with applicable local codes for acceptable pipe material.
Exhaust venting must be supported to reduce strain on piping joints. Failure to
follow these instructions may result in result in damage, serious injury or death.
In Canada, the first 3 ft(915 mm) of vent piping must be readily accessible for inspection.
Table 4-2 Mandatory Vent Pipe Transition Piece
Model No. CPVC Vent Pipe Size CPVC Transition Vent Pipe Length Full Insertion Depth
Trinity Lx150-200 3” Minimum 5” [127 mm] 2-7/8” [73 mm]
Trinity Lx300-400 4” Minimum 4” [100 mm] 1-7/8” [48 mm]
Trinity Lx800 6” Minimum 6” [152 mm] 2-1/2” [63 mm]
Vent/Air-Intake Pipe Material
Table 4-3 Acceptable Vent and Air-Intake Pipe Material
Installation Standards
Items
1
Materials
2, 3
United States Canada
4
PVC - DWV ANSI/ASTM D2265
PVC Schedule 40 ANSI/ASTM D1785
Vent Pipe and
Fittings CPVC Schedule 40 ANSI/ASTM F441
PVC ANSI/ASTM D2564
Pipe Cement CPVC ANSI/ASTM F493
Primers PVC / CPVC ANSI/ASTM F656
All venting material in
Canada must be
ULC S636 approved.
See Note 4 below for
appropriate temperature
applications.
All Vent and Air-Intake
materials installed on gas
fired appliances in CAN/US
must meet the Standards
listed in Table 4-3. Failure
to comply could result in
fire, serious injury or death.
Notes:
1
Refer to Table 4-4 for Allowable Vent and Air-Intake Pipe Sizes and Lengths.
2
Closet/alcove installations in US and Canada require approved CPVC vent pipe, fittings, cements, and primers.
3
The Air-Intake does not require high temperature pipe material. Check applicable local codes for acceptable materials.
4
ULC S636 PVC is approved for flue gas temperatures up to 149
o
F (65
o
C) and must only be used for low temperature
applications. High temperature applications requiring appliance supply water temperatures greater than 140
o
F (60
o
C)
must use ULC S636 approved CPVC.
5
Air-Inlet - check with applicable local codes for acceptable pipe material.
A
ir
-
Inlet
4” Pipe *
Exhaust Vent
6” CPVC
Swing Joint
to attain slope in
horizontal runs
Flue Outlet
6”
stainless steel
elbow (factory
supplied)
Air-
Inlet Adapter
4” stainless steel
(factory supplied )
90
o
elbow typical, or tee
and drain cap option for
easy cleanouts
Air-
Inlet Adapter
4” stainless steel
(factory supplied
)
90
o
elbow typical, or tee
and drain cap option for
easy cleanouts
Flue Outlet
6”
stainless steel
elbow (factory
supplied)
Exhaust Vent
6” PVC (check
local codes
and Table 4-3)
Coupling
6
”
PVC, length 4”
Air
-
Inlet
4/6” Pipe *
Transition
6” CPVC
Swing Joint
to attain slope in
horizontal runs
Mandatory Vent
Pipe
Transition
P
iece
6” CPVC (factory supplied). See Table 4-2.

Lx Series Installation and Operation Instructions │Trinity Lx
15
Mandatory Pre-commissioning Procedure for Plastic Venting
Do not apply power to the appliance prior to Step 4 in the Mandatory Pre-commissioning
Procedure for Plastic Venting.
1) Working with the power turned off to the appliance, completely install the vent and air intake system,
securely cementing joints together. If possible, allow primers/cements to cure for 8 hours before firing the
burner. If curing time is less than 8 hours, proceed with Steps 2 through 6.
2) Maintain the appliance gas supply shut-off valve in the off position.
3) Disconnect electrical leads to the Hot Surface or Spark Igniter. Ensure the cables are placed in a fashion
where they will not arc to ground or other conductor.
Spark Igniter Cable - Maintain a minimum 2” separation between spark igniter circuit and
conductors. Failure to follow instructions may result in component failure, injury or death.
4) Turn power on to the appliance and apply a heat demand.
5) Allow for 3 complete trials for ignition, consisting of pre and post purge of the combustion blower, until an
ignition lockout occurs. Repeat the process two more times (i.e. 9 complete ignition sequences in total).
6) Turn power off and reconnect the electrical leads to the Igniter.
Vent/Air-Intake Pipe Length Determination
Use Table 4-4 to determine the maximum pipe length that can be used. The table calculates sweep, 90º elbows,
and 45º elbows at 5 equivalent feet [1.52 m] each. Allowable equivalent pipe lengths for vent and air-intake pipes
are shown separately for Natural Gas and LP. Length calculations need not include the three 90°elbows of the
exterior vent piping (two outlet, one inlet).
Example:An Lx200 can be installed with 105 equivalent feet [32 m] of air-intake piping and 105 equivalent feet
[32 m] of vent piping when operating with Natural Gas. When operating with Propane Gas (LP), the maximum
vent length in equivalent feet is limited to 50’ (3” pipe). Maximum equivalent feet may vary depending on model
number and vent pipe size (.i.e. 30’ with 4” pipe and 65’ with 6” pipe). Note, the Lx800 operates on Natural Gas
only; therefore, no pipe lengths are specified for Propane. See Table 4-4 for more details.
The length of one vent pipe (intake or exhaust) may not exceed the length of the other
vent pipe by more than 20 equivalent feet (6.1 m).
Table 4-4 Allowable Vent and Air-Intake Pipe Size and Lengths
Number of Elbows (90’s or 45’s) and Equivalent Feet [Meters]
Model No. Pipe
Size Gas Length ft. [m]
1
2
3
4
5
6
7
8
9
3” LP 50
[15.2] 45 [13.7] 40 [12.2] 35 [10.7] 30 [9.1] 25 [7.6] 20 [6.1] 15 [4.6] 10 [3.0] 5 [1.5]
3” NG 105
[32] 100 [30.5] 95 [28.9] 90 [27.4] 85 [25.9]
80
[24.4]
75
[22.9] 70 [21.3] 65 [19.8] 60 [18.3]
Trinity Lx150
Trinity Lx150E
Trinity Lx200 4” NG
& LP 105 [32] 100 [30.5] 95 [28.9] 90 [27.4] 85 [25.9]
80
[24.4]
75
[22.9] 70 [21.3] 65 [19.8] 60 [18.3]
Trinity Lx300
Trinity Lx400 4”/6”
NG
& LP 100 [30.5] 95 [28.9] 90 [27.4] 85 [25.9] 80 [24.4] 75 [22.9] 70 [21.3] 65 [19.8] 60 [18.3] 55 [16.8]
Trinity Lx800 4”/6”
1
NG
2
100
[30.5] 95 [28.9] 90 [27.4] 85 [25.9] 80 [24.4] 75 [22.9] 70 [21.3] 65 [19.8]
60
[18.3]
55
[16.8]
Notes
1
Only 6” exhaust vent is permissible for the Lx800. Air intake pipe can be 4” or 6” (6” is recommended).
2
Model Lx800 operates with Natural Gas only.
Venting Options
Venting systems include direct vent (two-pipe), concentric vent, and indoor combustion air for side-wall or roof
terminations. Options are model dependent. See Figures 4-4 to 4-8 for Options and Figures 4-12 to 4-14 for Kits.
PVC In Canada - Safety authorities in some jurisdictions are not allowing PVC venting
materials with appliances of any kind, even if System 636 certified. Check with the local
safety inspector to verify compliance prior to installing a PVC Concentric Vent Kit with a Trinity Lx appliance.
Venting Options - Due to potential moisture loading (build-up) along the exterior wall,
sidewall venting may not be the preferred venting option. See Figs 4-4(b), 4-5(b), 4-8 (b).

Trinity Lx │Installation and Operation Instructions Lx Series
16
Optional Termination Kits
NTI does not stock System 636 PVC Concentric Vent Termination Kits as they are readily available from IPEX
via Canadian wholesalers. Canadian customers wanting more information on System 636 Concentric Vent Kits
or wholesaler locations can contact IPEX directly at 1-866-473-9462 (toll free in Canada) or www.ipexinc.com.
Concentric Vent Termination Kit - United States (Lx150-200)
•Use NTI part number 82666 (York part number 1CT0303). Kits no longer approved for use in Canada.
•Optional for Trinity models Lx150-200 only (not for use with Lx300-800 models).
•Instructions included with vent terminal contain more detailed assembly and installation instructions.
•Clearance requirements in this manual supersede those of the instructions included with the vent terminal.
•Terminal MUST be cemented together during installation.
Concentric Vent Termination Kit – Canada (Lx150-200)
•Use IPEX part number 196006 (Concentric Kit) and 196051 (Vent Screen), certified to ULC S636. Use of
this material is subject to approval by local authorities. Kit 82666/1CT0303 no longer approved for Canada.
•Optional for Trinity models Lx150-200 only (not for use with Lx300-800 models).
•Instructions included with termination kits contain more detailed assembly and installation instructions.
•Clearance requirements in this manual supersede those of the instructions included with the vent terminal.
Side Wall Termination Kit (Lx300-800)
•Use NTI part number 83236 (4” kit connections. 6” venting must reduce down to 4” at interior trim piece).
•Side-wall terminations only. See Figures 4-6(b) and 4-7(b).
•Instructions included with vent terminal contain more detailed assembly and installation instructions.
Indoor Combustion Air Kit (Lx800 only)
•Use NTI part number 84093.
•Direct vent exhaust termination can be side-wall or roof mounted. See Figure 4-8(a) and (b).
•Air-intake termination via the Indoor Combustion Air Kit certified with this product.
•Kit includes assembly instructions, interlock connection instructions to unit, mounting hardware, and air filter.
•Additional code requirements for room supplied combustion air are summarized in Table 4-5.
If an Indoor Combustion Air Kit is installed in lieu of a direct vent air-intake, additional
code requirements for room supplied combustion air must be followed to provide the unit
with adequate air for complete combustion at high fire and to prove air flow during equipment operation. Failure
to follow instructions in this manual will result in serious injury or death. See Table 4-5 (Lx800 only).
Concentric
Venting Options
Figure 4-4(a) Lx150-200 Figure 4-4(b) Lx150-200
Concentric Side Wall Termination (Optional Kit) Concentric Roof Termination (Optional Kit)

Lx Series Installation and Operation Instructions │Trinity Lx
17
Two
-
Pipe
Venting Option
s
Figure 4-5(a) Lx150-200 Figure 4-5(b) All Models
Two-Pipe Side Wall Termination Two-Pipe Roof Termination
Figure 4-6(a) Lx300-400 Figure 4-6(b) Lx300-400
Two-Pipe Side Wall Termination Two-Pipe Side Wall Termination (Optional Kit)
Typical for all models.
Lx200 unit
shown for
illustration purposes.

Trinity Lx │Installation and Operation Instructions Lx Series
18
Figure 4-7(a) Lx800 Figure 4-7(b) Lx800
Two-Pipe Side Wall Termination Two-Pipe Side Wall Termination (Optional Kit)
Indoor Combustion Air Options
Figure 4-8(a) Lx800 Only Figure 4-8(b) Lx800 Only
Side Wall Vent / Indoor Combustion Air (Optional Kit) Roof Vent / Indoor Combustion Air (Optional Kit)

Lx Series Installation and Operation Instructions │Trinity Lx
19
Indoor Combustion Air Requirements (Lx800 Only)
Drawing combustion air from the room can result in competition for combustion air with other fuel burning
appliances, ventilation air systems or exhaust sources. See Table 4.5 for a list of design considerations and
installation guidelines. Check with applicable codes and authorities regarding specific application requirements.
MERV Filter – The Indoor Combustion Air Kit comes with a 2” MERV 7 filter which is
mandatory for appliance operation. Do not operate the unit using indoor combustion air
without the filter installed. Failure to comply may result in property damage, serious injury or death.
Mandatory Interlocks - Required between motorized dampers and burner ignition controls to ensure adequate
supply or make-up air is provided. The Lx800 comes equipped with auxiliary proving capability. Simply remove
the jumper on the Low Voltage barrier labeled Aux. Proof (T2-7,8) and replace with field supplied end switch
incorporated with motorized damper and/or louver controls.
Wall Openings - Outdoor opening for louvers/grilles must be sized so that the minimum unobstructed area will
provide adequate air flow at high fire, known as the FREE AREA and is expressed in square inches/Btuh. Free
Area (FA) is determined by taking the area of the wall opening less any obstructions. Common louver free areas
range from 35% to 60% of the wall opening, meaning 65% to 40% is obstructed by the frame and blades.
Table 4-5 Indoor Combustion Air Guidelines
Parameters Method / Type Requirements NFPA 54 Part 9.3 /
CSA B149 Part 8.0 Comments
Ventilation applicable codes
Supply Air
1
Combustion Air five methods (below)
locate combustion air openings lower
than ventilation air openings see "Combustion Air Methods"; see "Air Competition"
Indoor Air by volume infiltration or air changes/hour see "Air Competition"
Outdoor Air by opening area 1 or 2 permanent openings see "Outdoor Opening"
Comb Indoor/Outdoor see indoor/outdoor air calculate each method separately see "Indoor Air" / "Outdoor Air"
Engineered Air adequate air approved engineered design
Combustion
Air Methods
Mechanical Air outdoor air supplied
@
0.35cfm/1000Btuh interlocks mandatory subject to approval by authority
having jurisdiction
Exhaust Fans provide make-up air supply = exhaust + combustion air
Other Appliances
2
adequate air for all supply = collective combustion air
Air
Competition Building Ventilation additional air supply = ventilation
+ combustion air
fuel burning appliances must not
share combustion air with other
appliances or compete for air
with exhaust sources
Damper interlock
3
on driven member
Interlocks Fan interlock
4
with appliance burner
combustion air must be proven prior
to igniting appliance burner interlocks required by ASME CSD-1, Part CG-260
Fixed fully open position
Automatically adjustable interlocks required
Louvers,
Grilles, &
Dampers Manually adjustable not permitted
opening must be sized to provide the
Required Free Area see "Outdoor Opening"
Opening Free Area
5
unrestricted flow
Outdoor
Opening Opening Nominal gross dimensions Opening FA must be > Required FA for Combustion Air. see "Free Area, Required"
Free Area,
Required Calculate Required FA for Combustion Air 1 sq. in./4000 Btuh Required FA for Lx800 = (1/4000) x 800,000 Btuh = 200 sq. in. see "Free Area, Opening Size"
and/or "Free Area, Duct Area"
Known FA, specified Opening FA Nominal larger than Opening FA.
Nominal,
Opening
Size Unknown FA, assumed wood
25%; metal 75%
Nominal=Required FA/Assumed FA
N = 200 sq. in. / 75% = 276 sq. in.
select louver/grille/damper with
Opening FA = Required FA
Vertical ducts 1/4000 vertical duct area = FA
Free Area,
Duct Area Horizontal ducts 1/2000 horizontal duct area = FA / 2 combustion air ducts, minimum dimension = 3”
Notes:
1
Placing ventilation and combustion air openings too close to each other may result in short circuiting of air flow.
2
Combustion air for each appliance must be calculated separately. The outdoor opening size can be a single opening
large enough for the collective total of each appliance in the room or a separate opening for each appliance.
3
Louvers/dampers must be fixed open or interlocked with fuel burning equipment to prove air flow during operation.
4
Screens/grilles over air openings create air flow resistance decreasing the effective area of unrestricted flow. "Free Area"
(FA) is the minimum unobstructed area needed for adequate air flow at high fire expressed in square inches/Btuh.
5
Each appliance must be interlocked with the mechanical air supply system in the boiler room to prevent burner
operation when the fan is not operating.

Trinity Lx │Installation and Operation Instructions Lx Series
20
Labeling and Identification – Roof Top Terminations
Figure 4-9(a) All Models Figure 4-9(b) Lx150-200
Two-Pipe Roof Top Termination Concentric Vent Roof Top Termination
Two-pipe terminations typically penetrate the roof
surface. An alternative is to use an existing chimney
as a chase way. See Figure 4-17 for more details.
To prevent water leakage, install adequate roof
weather seal flashing (not included) around roof
penetration as shown.
Labeling and Identification – Concentric Vent Side Wall Terminations
Figure 4-10(a) Lx150-200 Figure 4-10(b) Lx150-200
Concentric Vent Side Wall Termination Concentric Vent Detail
Insert vent screen between the end of the appliance
exhaust vent and the end cap as shown. The End Cap
Insert vent screen between the end of the appliance
exhaust vent and the end cap as shown. The End Cap
must be secured to the vent pipe via cement or
stainless steel screws.
Warning Plate
From
appliance
exhaust
To appliance
air-inlet
connection
Exhaust Vent
Outlet (center)
Gas Vent Directly Below
Keep Free of Obstructions
Concentric
“Y” Fitting
Combustion
Air-Inlet
(perimeter)
Support
(field
supplied)
To appliance
air-inlet
connection
From
appliance
exhaust
Air
-
Inlet
Roof weather
seal flashing
(field supplied)
24” [610 mm]
from terminal
end cap vanes
Exhaust Vent
Exhaust
Vent
Air
-
Inlet
Chimney
Cap
Existing
Chimney
(used as a
chase way)
Flashing
Exhaust
Vent
Combustion
Air Inlet
End Cap
Vanes (typical)
End Cap
Exterior Wall