NTI Lx400, Lx200, Lx300, Lx150E, Lx500 Installation And Operation Instructions Manual

Visit us

online

Trinity Lx

Model Numbers: Lx150 - 800
Version Date: 2016-01-27

INSTALLATION AND OPERATION INSTRUCTIONS FOR
TRINITY Lx BOILER

TABLE OF CONTENTS

HAZARD SYMBOLS AND DEFINITIONS

Danger Sign: Indicates a hazardous situation which, if not avoided, will
result in serious injury or death.

Warning Sign: Indicates a hazardous situation which, if not avoided,
could result in serious injury or death.

Caution Sign plus Safety Alert Symbol: Indicates 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: Indicates a hazardous situation which, if not avoided,
could result in property damage.

This Boiler 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.

H

NTI # 86573

2

Trinity Lx │Installation and Operation Instructions Lx Series

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 boiler 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 boiler 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 boiler if any part has been under water. Immediately call a qualified service technician
to inspect the boiler 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 boiler.

3. This boiler 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 boiler.

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 Boiler” and call your service

technician or gas supplier.

TO TURN OFF GAS TO THE BOILER_

1. STOP! Read the safety information above very carefully.

2. Turn off all electric power to the boiler

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 15.0 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 boiler. This boiler
contains materials that have been identified as carcinogenic, or possibly carcinogenic, to humans).

Void Warranty - This Boiler 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

Energy Saving Feature - This boiler is equipped with a feature that saves energy by

reducing the boiler water temperature as the heating load decreases. This feature is
equipped with an override which is provided primarily to permit the use of an external energy management
system that serves the same function. THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST ONE
OF THE FOLLOWING CONDITIONS IS TRUE :

 An external energy management system is installed that reduces the boiler water temperature as the heating

load decreases.

 This boiler is not used for any space heating.
 This boiler is part of a modular or multiple boiler system having a total input of 300,000 BTU/hr or greater.
 This boiler is equipped with a tankless coil.

1.0 INTRODUCTION
General Installation Requirements

The installation of your NTI Trinity Lx boiler 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, Lx500, Lx600, Lx700 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 the
following:

1. Installation and Operating Instructions,

2. Appendix A – Controller and Touchscreen Display Instructions,

3. Trinity User’s Manual, and

4. Natural Gas to LP Conversion Kit*
* The conversion kit is required to convert the boiler so it will safely operate with Propane Gas.

Models Lx600-800 are not approved for operation with Propane (LP Gas). Operating
these models with Propane 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 boiler must be installed and serviced by a qualified installer or service technician. This boiler 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 (see
Section 15 – Annual Maintenance and Inspection).

Failure to have the boiler 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-inlet clear of ice, snow, and other
debris may result in property damage, serious injury, or death.

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. The Installer assumes all
responsibility for a safe installation and that it meets the requirements of the boiler instruction manuals, as well
as National and local installation 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.

4

Trinity Lx │Installation and Operation Instructions Lx Series

Failure to use the appropriate Natural to LP Conversion Kit and Orifice 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 conversion kit and LP
orifice numbers.

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 and Orifice must be installed to convert the boiler so it will operate safely with
LP Propane. The correct kit and LP orifice is listed below (Each kit comes with conversion instructions).

Liquefied Petroleum (LP) propane gas is heavier than air; therefore, it is imperative that your Trinity Lx boiler
is not installed in a pit or similar location that will permit heavier than air gas to collect. Local Codes may
require boilers 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_
Model Number Kit Number LP Orifice
Lx150-200 82650-1 52 (5.2mm)
Lx300 82650-1 62 (6.2mm)
Lx400 83017-1 62 (6.2mm)
Lx500 84386-1 No Orifice

Boiler Vent / Air-Inlet Piping

The Trinity Lx is certified as a “Category IV” boiler, and requires a “Special Venting

System” designed for pressurized venting. The exhaust gases must be piped directly to

the outdoors using the vent materials and rules outlined in these instructions. Failure to
follow these instructions will result in serious injury or death.

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 cannot 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 boiler or equipment. The sign shall read, in print size no less than one­half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”
(plate included with boiler).

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:

1. The referenced “special venting system” instructions shall be included with the boiler or equipment installation

instructions; and

2. The “special venting system” shall be Product Approved by the Board, and the instructions for that system shall

include a parts list and detailed installation instructions.

(e) A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment,

all venting instructions, all parts list for venting instructions, and/or all venting design instructions shall remain with
the boiler or equipment at the completion of the installation.

Lx Series Installation and Operation Instructions │Trinity Lx

6

DESCRIPTION

Lx150

Lx150E

Lx200

Lx300

Lx400

Lx500

Lx600

Lx700
Lx800

Gas Connection
(inches, NPT)

½” (Female)

¾” (Female)

1” (Male)

Water Connections
(inches, NPT)

1” (Female)

1-1/4” (Female)

2” (Female)

Exhaust Vent
Connection (inches)

3

4

6

Air-inlet Connection
(inches)

3

4

Cabinet Height
(inches)

29.5

36

43

37

Cabinet Width
(inches)

17

Cabinet Depth
(inches)

18.5

21.5

24

32.5

47.5

63.5

Approximate Weight
with water (lbs)

100

125

180

225

320

380

475

Water Content
(gallons)

1

1.2

2.1

2.4

3.3 4 5.2

Electrical Rating

120V / 1 Phase / 60 Hz / 12A

Notes:

1

Water connections for Lx150 units sold in Canada are 3/4” NPT and Copper union.

DESCRIPTION

Lx150(E)

Lx200

Lx300

Lx400

Lx500

Lx600

Lx700

Lx800

CSA Input
Modulation (MBH)

1

25 – 150

2

25 - 199

55 - 275

75 - 399

100 - 500

120 - 600

160 - 700

160 - 800

DOE Heating
Capacity (MBH)

1,3

136

181

251

375

470

564

658

752

Net I=B=R Rating
(MBH)

1,3

118

157

218

326

409

490

572

654

DOE AFUE (%)

3

93.5

93.7 - - - -

-

Combustion
Efficiency (%)

3

- - -

95

Thermal Efficiency
(%)

3

- - -

94

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 than 2000 feet [610 m].

2

The maximum input when operating on LP-Gas is limited to 145 MBH for model Lx150.

3

Based on standard test procedures prescribed by the U.S. Department of Energy. Ratings have been confirmed by AHRI.

Trinity Lx │Installation and Operation Instructions Lx Series

2.0 INTRODUCTION

Table 2-1 General Specifications

Table 2-2 Boiler Performance Specifications

7

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 10%

de-rate by 10%

de-rate by 10%

de-rate by 10%

de-rate % may vary

In USA 2

-

de-rate by 12%

de-rate by 16%

de-rate by 18%

de-rate by 20%

Notes:

1

Canada: Altitudes between 2000-4500 ft [610-1372 m], de-rate by 10%. 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], if altitude is over 2000 ft [610 m].

Lx Series Installation and Operation Instructions │Trinity Lx

High Altitude Operation

The Trinity Lx 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 2-3.

Table 2-3 De-rate % for High Altitudes

Combustion – At elevations above 2000 feet, the combustion of the boiler 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.

8

Trinity Lx │Installation and Operation Instructions Lx Series

3.0 BOILER 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 boiler location.

Floor Mounting

The Trinity Lx can be mounted directly on combustible flooring, with the exception of carpeting. Installing the
boiler on carpeting is not permissible. Ensure the boiler is mounted above any anticipated flood level. Models
Lx150-Lx400 come equipped with stationary, low profile legs. Models Lx500-Lx800 include 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.

Boiler Area Ventilation Air Openings

Direct Vent – If boiler area clearances are less than the recommended clearances specified in Table 3-1, the

boiler area must be ventilated. (Exception: if the boiler area/room has a volume of 150 ft3 or greater,
ventilation of the boiler room is not required). Each ventilation air opening must meet the minimum
requirements of 1 in2 per 1000 Btu/hr, but not less than 100 in2. 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.

Indoor Combustion Air – When using Indoor Combustion Air in lieu of Direct Vent air-inlet piping (an option

for models Lx500-800), provisions for combustion and ventilation air, in accordance with section “Air for
Combustion and Ventilation,” of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 (U.S.), or Clause 8.2,

8.3 or 8.4 of Natural Gas and Propane Installation Code, CAN/CSA B149.1 (Canada), or applicable
provisions of the local building codes, must be adhered to.

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 in2 per 1000 Btu/hr, but not less than 100 in2 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 than 18” [457 mm] from the front of the boiler and the
room is at least three (3) times the size of the alcove. Provided these conditions are met, the boiler 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 boiler a minimum of 18” [457 mm] above the floor. Locate or
protect the boiler so it cannot be damaged by a moving vehicle. Check with your local authorities for other
possible regulations pertaining to the installation of a boiler in a garage.

Wall Mounting Installations (Optional)

Lx150-400 models are shipped with wall mounting brackets to provide installers with the option of wall
mounting the boiler. Lx500-800 models are 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.

Water or flood damaged components must be replaced immediately with new factory­approved components as failure to do so may result in fire, serious injury, or death.

If the "Boiler Area" does not meet the recommended clearances listed in Table 3-1, and
if the boiler area has a volume less than 150 ft3, it is considered a Closet or Alcove. PVC
vent pipe and fittings shall not be used within the closet or alcove; only approved CPVC,
Polypropylene or Stainless Steel vent pipe and fittings can be used. See Table 4-3 for a
list of approved materials.

9

Figure 3-1(a) Closet Installation, Minimum Clearances (Lx150-200)

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 in2 per 1000 Btu/hr, min. 100 in2

Ventilation Air Opening
1 in2 per 1000 Btu/hr, min. 100 in2

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]

Piping must be CPVC

1” [25 mm] clearance for

hot water and vent pipes

Removable Surface or Closet Door

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]

Left Side 12” [305 mm]

Right Side 12” [305 mm]

6” [152 mm] max. below vent opening

Ventilation Air Opening
1 in2 per 1000 Btu/hr, min. 100 in2

Ventilation Air Opening
1 in2 per 1000 Btu/hr, min. 100 in2

Piping must be CPVC

1” [25 mm] clearance for

hot water and vent pipes

Lx Series Installation and Operation Instructions │Trinity Lx

Figure 3-1(b) Closet Installation, Minimum Clearances (Lx300-400)

Closet/alcove installations in US and Canada require approved CPVC vent and air-inlet
pipe, fittings, cements and primers (Table 4-3).

10

Figure 3-1(c) Closet Installation, Minimum Clearances (Lx500-800)

Model No.

Clearances

Dimensions - inches

Front

Top

Left Side

Right Side

Rear

Flue Pipe

Lx150-200

Minimum

24 1

12

12 4 0

1

Recommended

24 24

24 2 4 0

1

Lx300-400

Minimum

24 1

12

12

12 0 1

Recommended

24 24

24 2

12 0 1

Lx500-800 3

Minimum

24 1

12

24 4 14

1

Recommended

24

24

30

24

18

1

Notes:

1

6” if surface is removable allowing 24” clearance (i.e. closet installation). See Ventilation Air Opening dimensions in
Figure 3-1.

2

Clearances can be as low as 12” if the right side has a clearance of 24”.

3

For models Lx500-800, ensure rear of unit is accessible for wiring and flue gas testing.

Front 6” [152 mm]

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 in2 per 1000 Btu/hr,
min. 100 in2

Ventilation Air Opening
1 in2 per 1000 Btu/hr,
min. 100 in2

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.

Model Lx800

shown

Trinity Lx │Installation and Operation Instructions Lx Series

Table 3-1 Minimum Clearances for Installation and Service

11



Figure 3-2(a) Wall Mounting Installations (Lx150-200)

 Remove the upper wall mount bracket from the

back of the boiler.

Failure to follow instructions may
result in fire, serious injury, or death.

 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 boiler.
Ensure the bracket is mounted in the level
position. Refer to Table 2-1 Specifications for
boiler weight.

This unit requires two people to lift it
or damage and injury may result.

 Mount the boiler to the bracket by aligning the

slots in the back of the boiler 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 boiler). 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).







Ensure that the top of each
slot rests on the bottom of the
grooves in the wall bracket.

Bottom Bracket is in

Lx Installation Kit Box

Lx Series Installation and Operation Instructions │Trinity Lx

12

Figure 3-2(b) Wall Mounting Installations (Lx300-400)

 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.

bottom-back of the boiler (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 boiler
(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.

This unit requires two people to lift it
or damage and injury may result.

 Mount the boiler 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 boiler is resting securely on the upper

bracket, secure the bottom bracket to the
underside of the boiler using the mounting
hardware removed in Step 1; then, anchor the
bottom bracket to the wall as shown.



B

A

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

Bottom Bracket is in

Lx Installation Kit Box





B



Trinity Lx │Installation and Operation Instructions Lx Series

13

Lx Series Installation and Operation Instructions │Trinity Lx

4.0 GENERAL VENTING

The Trinity Lx is certified as a “Category IV” boiler requiring a “Special Venting System” designed for
pressurized venting. The Exhaust Vent must be piped to the outdoors, using the vent materials 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.

Removing an Existing Boiler from Common Venting System

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.

Steps to Removing an Existing Boiler

1. Seal any unused openings in the common venting system.

2. Visually inspect the venting system for proper size and horizontal pitch. Verify that there is no blockage,

restriction, leakage, corrosion or other deficiencies which could cause an unsafe condition.

3. Insofar as is practical, close fireplace dampers, 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.

4. Place in operation the boiler being inspected. Follow the lighting instructions. Adjust thermostat so boiler

will operate continuously.

5. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame 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, fireplace dampers and
any other gas burning appliance to their previous condition of use.

7. Any improper operation of the common venting system should be corrected so the installation conforms with

the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and Propane
Installation Code. 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 in Part 11 of the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and Propane
Installation Code.

Vent and Air-inlet are to be piped separately. The Trinity Lx cannot share a common vent
or air-inlet with multiple appliances. Failure to comply will result in serious injury or
death.

Do not install the Trinity Lx into a common venting system with any other appliances.
Failure to comply with this warning will cause flue gas spillage and leech carbon
monoxide emissions into the surrounding air resulting in serious injury or death.

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 remaining appliances
connected to it. Instructions have been provided on how to remove the existing boiler
and how to resize the remaining venting system. Failure to follow these instructions may
result in property damage, serious injury or death.

14

Figure 4-1 Installation of Optional Air Filter Kit (P/N 84093)

Remove factory appliance

air-inlet adapter; keep screws
from installation of filter kit

Secure filter kit using factory

screws removed in step 1.
Reuse the factory gasket.

Secure the filter in place

with the brackets and knurled
screws provided in the filter kit.

Trinity Lx │Installation and Operation Instructions Lx Series

Direct Vent Installation (Mandatory for models Lx150-400)

When installed as a Direct Vent boiler the combustion air-inlet must also be piped directly to the outdoors using
the methods described in this section and in accordance with the National Fuel Gas Code, ANSI Z223.1 (U.S.) or
CSA B149.1 (Canada) and local requirements.

Indoor Combustion Air (Optional for models Lx500-800)

When the installation uses Indoor Combustion Air (i.e. piping is not directly connecting the boiler air-inlet fitting
to the outdoors), provisions for combustion and ventilation air, in accordance with section “Air for Combustion

and Ventilation,” of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 (U.S.), or Clause 8.2, 8.3 or 8.4 of
Natural Gas and Propane Installation Code, CAN/CSA B149.1 (Canada), or applicable provisions of the local

building codes, must be adhered to.

Air Filter Kit (P/N 84093) – When using indoor combustion air (non-Direct Vent), it is highly recommended to

use the optional Air Filter Kit (P/N 84093) to limit the amount of dust that enters the combustion system. The
Filter Kit can be installed on boiler models Lx500-800, as illustrated in Figure 4-1 (comprehensive
installation instructions are provided with the Filter Kit).

The boiler shall be located so as not to interfere with proper circulation of combustion,
ventilation, and dilution air.

Make up air requirements for the operation of exhaust fans, kitchen ventilation systems,
clothes dryers, and fireplaces shall be considered in determining the adequacy of a space
to provide combustion air requirements. Failure to ensure adequate make up air to all
appliances may result in personal injury or death.

Controller RPM Adjustments – To avoid the potential boiler lockouts due to wind and
static pressure differences, the Lightoff and Minimum Modulation RPM Rates must be
adjusted as per Figures 4-11 and 4-21 in Appendix A when using indoor combustion air.

Venting Limitation – When using the Air Filter Kit on models Lx500-600, the maximum
equivalent exhaust vent length is limited to 30 ft. with 4” piping, or 90 ft. with 6” piping;
see warning below Table 4-5.

Lx Series Installation and Operation Instructions │Trinity Lx

15

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

Combustion Air-inlet Contamination

Be careful not to locate the Air-inlet 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

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.

It is BEST PRACTICE to pipe the combustion air-inlet directly to the outdoors (Direct
Vent installation) to avoid contamination often contained in indoor air.

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.

Mandatory Pre-commissioning Procedure for Plastic Venting (PVC or CPVC)

Do not apply power to the boiler prior to Step 4 in the Mandatory Pre-commissioning
Procedure for Plastic Venting.

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.

1) Working with the power turned off to the boiler, completely install the vent and air-inlet 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 boiler 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. Refer to warning regarding Spark Igniter Cable.

4) Turn power on to the boiler 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.

16

Model No.

CPVC Vent Pipe Size

CPVC Transition Vent Pipe Length

Full Insertion Depth

Lx150-200

3”

Minimum 5” [127 mm]

2-7/8” [73 mm]

Lx300-600

4”

Minimum 4” [100 mm]

1-7/8” [48 mm]

Lx700-800

6”

Minimum 6” [152 mm]

2-1/2” [63 mm]

Model No.

Vent Material

Venting Brand

Adapter Part No.

1,2

Lx150-200

Polypropylene

DuraVent – PolyPro

300150

Centrotherm - InnoFlue

ISANY0303

Stainless Steel

DuraVent – FasNSeal

300715

Lx300-600

Polypropylene

DuraVent – PolyPro

300151

Centrotherm - InnoFlue

ISAA0404

Stainless Steel

DuraVent – FasNSeal

303631

Lx700-800

Polypropylene

DuraVent – PolyPro

810004281

Centrotherm - InnoFlue

ISAA0606

Stainless Steel

DuraVent – FasNSeal

810005231

Notes:

1

Listed boiler adapters are only approved for use with the respective venting brand; i.e. a PolyPro boiler adapter shall not

be used with InnoFlue venting.

2

PolyPro and FasNSeal boiler adapters are available from DuraVent (1-800-835-4429 or www.duravent.com); InnoFlue

boiler adapters are available from Centrotherm Eco Systems (1-877-434-3432 or www.centrotherm.us.com).

Trinity Lx │Installation and Operation Instructions Lx Series

Near Boiler Vent/Air-inlet Piping

Each Trinity Lx is equipped with a short piece of approved CPVC vent pipe (see Table 4-2 CPVC Vent Pipe
Transition Piece). Insert one end into the boiler flue outlet adapter and cement the other to field venting (see
Table 4-4 for approved venting material). The CPVC vent pipe should extend fully into the boiler flue outlet
adapter (see Table 4-2). Ensure that the venting system does not apply a load or strain on the boiler 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 4-2 through 4-5.

Table 4-2 CPVC Vent Pipe Transition Piece (used when venting with PVC)

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.

PVC Exhaust Venting – DO NOT insert PVC pipe directly into the boiler exhaust
adapter, as it can deform from the clamping force of the gear clamp. Failure to follow
these instructions may result in gasket failure and/or the dislodging of the exhaust pipe
from the boiler adapter, resulting in property damage, serious injury or death.

Polypropylene or Stainless Steel Venting – When using Polypropylene or Stainless Steel
piping, the appropriate boiler adapters must be used to transition the boiler vent
connections to accept the respective Polypropylene or Stainless Steel venting. See Table
4-3 for a list of approved adapters. Failure to use the correct adapter will result in flue gas
leakage resulting in property damage, serious injury or death.

Table 4-3 Boiler Adapters for Polypropylene and Stainless Steel Venting

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.

17

Figure 4-2(a) Near Boiler Venting (CPVC)

Figure 4-2(b) Near Boiler Venting (PVC)

Models Lx150-200

Models Lx150-200

Figure 4-3(a) Near Boiler Venting (CPVC)

Figure 4-3(b) Near Boiler Venting (PVC)

Models Lx300-400

Models Lx300-400

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
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

Exhaust Vent

4”/6” CPVC

Flue Outlet

Stainless Steel Adapter
(factory supplied)

Coupling
4” Removable
(factory supplied)

90o elbow typical, or tee and
drain cap option for easy cleanouts

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)

Exhaust Vent

4”/6” PVC (check local
codes and Table 4-3)

Transition Piece

4” CPVC, minimum 4”

long (factory supplied)

90o elbow typical, or tee and
drain cap option for easy cleanouts

Mandatory Vent Pipe
Transition Piece
See Table 4-2.

Lx Series Installation and Operation Instructions │Trinity Lx



Air-Inlet - check with applicable local codes for acceptable pipe material.

18

Figure 4-4(a) Near Boiler Venting (CPVC/PVC)

Models Lx500-600

Figure 4-5(a) Near Boiler Venting (CPVC)

Figure 4-5(b) Near Boiler Venting (PVC)

Models Lx700-800

Models Lx700-800

Air-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)

90o elbow typical, or tee
and drain cap option for
easy cleanouts

Air-Inlet Adapter

4” stainless steel
(factory supplied)

90o 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 Piece

6” CPVC (factory supplied). See Table 4-2.

Air-Inlet

4” Pipe *

Exhaust Vent

4” CPVC

Swing Joint
to attain slope in
horizontal runs

Flue Outlet 4”

stainless steel
(factory supplied)

Air-Inlet Adapter

4” stainless steel
(factory supplied)

90o elbow typical, or tee
and drain cap option for
easy cleanouts

Exhaust Vent

4” PVC (check

local codes
and Table 4-3)

Mandatory Vent Pipe
Transition Piece

4” CPVC (factory supplied).

See Table 4-2.

Transition

4” CPVC

OR

Trinity Lx │Installation and Operation Instructions Lx Series



Air-Inlet - check with applicable local codes for acceptable pipe material.

19

Items 1

Materials

2, 3

Installation Standards

All Vent and Air-inlet
materials installed on gas
fired appliances in CAN/US
must meet the Standards
listed in Table 4-4. Failure
to comply could result in
fire, serious injury or death.

United States

Canada 4

Vent Piping

and Fittings

PVC - DWV

ANSI/ASTM D2265

All venting material in

Canada must be

ULC S636 approved.

See Note 4 below for

appropriate temperature

applications.

PVC Schedule 40

ANSI/ASTM D1785

CPVC Schedule 40

ANSI/ASTM F441

AL29-4C

UL-1738

Polypropylene (PP)

-

Pipe Cement
PVC

ANSI/ASTM D2564

CPVC

ANSI/ASTM F493

Primers

PVC / CPVC

ANSI/ASTM F656

Notes:

1

Refer to Table 4-5 for Allowable Vent and Air-inlet Pipe Sizes and Lengths.

2

PVC venting (exhaust and air-intake) is not permitted within the Closet/alcove of a Closet/alcove installation.

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 149oF (65oC) and must only be used for low temperature
applications. High temperature applications requiring boiler supply water temperatures greater than 140oF (60oC) must
use ULC S636 CPVC, PP or AL29-4C.

Lx Series Installation and Operation Instructions │Trinity Lx

Vent/Air-inlet Pipe Material

Table 4-4 Acceptable Vent and Air-inlet Pipe Material

The use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenolsulfone) in the exhaust venting system is prohibited. Failure to follow these
instructions may result in property damage, personal injury or death.

Covering non-metallic vent pipe and fittings with thermal insulation is prohibited. Failure
to follow these instructions may result in property damage, personal injury or death.

20

Model

Pipe Size

Gas

Length

ft.

Number of Elbows (90’s or 45’s) and Equivalent Feet

1 2 3 4 5 6 7 8 9

Lx150-200

3”

LP

50

45

40

35

30

25

20

15

10

5

3”

NG

105

100

95

90

85

80

75

70

65

60

4”

NG

& LP

105

100

95

90

85

80

75

70

65

60

Lx300-400

4” or 6”

NG

& LP

100

95

90

85

80

75

70

65

60

55

Lx500

4” or 6” 3

NG & LP

100

95

90

85

80

75

70

65

60

55

Lx600

4”or 6” 3

NG 2

100

95

90

85

80

75

70

65

60

55

Lx700-800

6” 1

NG 2

100

95

90

85

80

75

70

65

60

55

Notes:

1

Only 6” exhaust vent is permissible for models Lx700-800. Air-inlet pipe can be 4” or 6” (6” is highly recommended).

2

Models Lx600-800 operate with Natural Gas only.

3

Models Lx500-600 are limited to 30 ft. of 4” or 90 ft. of 6” exhaust venting when using the Air Filter Kit (P/N 84093).

Trinity Lx │Installation and Operation Instructions Lx Series

Vent and Air-inlet Pipe Length Determination

Use Table 4-5 to determine the maximum pipe length that can be used. The table calculates sweep, 90º elbows,
and 45º elbows at 5 equivalent feet each. Note: models Lx150-200 have limitations when operating with
Propane Gas (LP).

Example: An Lx200 can be installed with 105 equivalent feet of air-inlet piping and 105 equivalent feet of

exhaust vent piping when operating with Natural Gas. When operating with Propane Gas (LP), the maximum
length of each the exhaust vent and air-inlet pipe is limited to 50 equivalent feet (3” diameter pipe).

Table 4-5 Allowable Vent and Air-Intake Pipe Size and Lengths

The length of one vent pipe (air-inlet or exhaust) may not exceed the length of the other
vent pipe by more than 20 equivalent feet.

Air Filter Kit venting restrictions - Models Lx500-600 are limited to 30 equivalent feet
of 4” (or 90 equivalent feet of 6”) exhaust vent when using the optional Air Filter Kit.
When transitioning from 4” to 6”, the 4” venting used must be counted 3 times to convert
to an equivalent length in 6”.

Example: An application uses one 90º elbow and 5 feet of 4” venting before converting to 6”; therefore, the 4”

venting has an equivalent length of 30’ [(5’+5’) x 3] of 6” venting; thus allowing an additional 60’ equivalent
of 6” venting (Note: Example is only true with Lx500-600 models using the optional Indoor Combustion Air

Kit).

21

Description

Vent

Size

Supplier P/N

Figure

Vent Material
Compatibility

Vent Option

Roof

Wall

IPEX Low Profile
(Flush Mount)

7

3”

196985 (NTI P/N 84357)

4-9

PVC/CPVC

7





4”

196986 (NTI P/N 84358)

IPEX Concentric
(Wall/Roof)

5,6,7,8

3”

196116 (NTI P/N 82666)

4-9(b), 4-10(b)

PVC/CPVC7





197117

4”

196021 (NTI P/N 84355)

197021

DuraVent - PolyPro
Concentric (Wall)

3”

3PPS-HK

4-9(d)

PVC/CPVC/PP





4”

4PPS-HK

DuraVent - PolyPro
Concentric (Roof)

3”

3PPS-VK

4-10(c)

PVC/CPVC/PP





4”

4PPS-VK

Centrotherm – InnoFlue

(Flush Mount)

3”

ISLPT0303

4-9

PVC/CPVC/PP





Centrotherm – InnoFlue
Concentric (Wall)

9

3”

ICWS3513 & ICTC0335

4-9(d)

PVC/CPVC/PP





ICWT352 & ICTC0335

4”

ICWS4639 & ICTC0446

Centrotherm – InnoFlue
Concentric (Roof)

9

3”

ICRT3539 & ICTC0335

4-10(c)

PVC/CPVC/PP





4”

ICRT4679 & ICTC0446

Notes:

1

Instructions included with termination kits contain detailed assembly and installation instructions.

2

All factory termination kits are ULC S636 approved.

3

Clearance requirements in this manual supersede those of the instructions included with the vent terminal.

4

Piping MUST be secured to the vent terminal during installation.

5

IPEX Concentric Terminal MUST be cemented together and to the vent pipes during installation.

6

Vent Screens provided with boiler may be used with the IPEX Concentric Vent Kits; otherwise use IPEX vent screens

(3 in. vent screen P/N 196051 – each sold separately).

7

IPEX Low Profile and Concentric kits (excluding P/N 197009) are constructed out of ULC S636 approved PVC; check

with your local authority for the acceptance of PVC as a venting material prior to use.

8

IPEX Concentric kits can be shortened to fit the requirements of the installation; see instructions included with the kit

for more details.

9

Centrotherm Concentric termination kits must use the applicable “Twin pipe to concentric adapter,” part number

ICTC0335 or ICTC0446.

10

3” Vent Termination Kits may only be used with models Lx150-200.

Lx Series Installation and Operation Instructions │Trinity Lx

Termination Options – Direct Vent Installation

The venting system of the Trinity Lx may be terminated using field supplied piping to construct a “Two-Pipe”
termination, see Figures 4-6(b), 4-7(a), 4-7(b) and 4-8(a); alternatively the venting may be terminated using a
factory kit selected from Table 4-6.

Kits certified with the Trinity Lx are listed in Table 4-6 and available from IPEX, DuraVent, Centrotherm and/or
NTI. For more information on System 636 Vent Kits or wholesaler locations contact IPEX directly USA: 1-800­463-9572 or www.IPEXamerica.com │ CAN: 1-866-473-9462 or www.ipexinc.com. For more information on
PolyPro Vent Kits or wholesaler locations contact DuraVent directly 1-800-835-4429 or www.duravent.com. For
more information on InnoFlue Vent Kits or wholesaler locations contact Centrotherm directly at 1-877-434-3432
or www.centrotherm.us.com.

Table 4-6 Optional Vent Termination Kits

Models Lx300-800 are not approved for use with any of the 3” vent termination kits; only
4” vent termination kits, listed in Table 4-6, are acceptable.

PVC In Canada - Authorities in some jurisdictions may not allow the use of any PVC
venting materials with condensing boilers; check with the local safety inspector to verify
compliance prior to installing a PVC Concentric Vent Kit with a Trinity Lx.

22

Figure 4-6(a) Concentric Sidewall Termination

Figure 4-6(b) Two-Pipe Sidewall Termination

(Lx200 Illustrated)

(Lx200 Illustrated)

Figure 4-7(a) Two-Pipe Sidewall Termination

Figure 4-7(b) Two-Pipe Sidewall Termination

(Lx800 Illustrated)

(Lx400 Illustrated)

Trinity Lx │Installation and Operation Instructions Lx Series

Sidewall Termination - Due to potential moisture loading (build-up) along the exterior

wall, sidewall venting may not be the preferred venting option. Refer to Figures 4-8 and
4-10 for roof top venting options.

Sidewall Termination Examples – Direct Vent Installation

23

Figure 4-8(a) Two-Pipe Roof Termination

Figure 4-8(b) Concentric Roof Termination

(Lx200 Illustrated)

(Lx200 Illustrated)

Lx Series Installation and Operation Instructions │Trinity Lx

Extra precaution must be taken to adequately support the weight of the Vent/Air-inlet
piping in applications using roof-top terminations. Failure to follow these instructions
may result in venting or boiler component failure resulting in flue gas spillage leading to
property damage, serious injury or death.

Roof Termination Examples – Direct Vent Installation

24

Figure 4-9(a)

Figure 4-9(b)

Two-Pipe Termination (Sidewall)

IPEX Concentric Termination (Sidewall)

Refer to documentation included with termination kit for
complete installation instructions.

Figure 4-9(c)

Figure 4-9(d)

Low Profile Termination (Sidewall)

PolyPro / InnoFlue Termination (Sidewall)

Refer to documentation included with termination kit for
complete installation instructions.

Min. 12”

above grade
or snow level

Exhaust

Air-inlet

Exhaust

Air-inlet around

perimeter

Min. 12”

above grade
or snow level

Exhaust center

Air-inlet bottom

Exhaust

Air-inlet

Gas Vent Directly Below

Keep Free of Obstructions

Refer to documentation included with termination kit for
complete installation instructions.

Exhaust

Air-inlet

Min. 12”

above grade
or snow level

Vertical

Min. 18”

Horizontal
4-12” or greater
than 36”

Exhaust

Air-inlet

Vent Screen

Vent pipe piece to
retain vent screen

Gas Vent Directly Below

Keep Free of Obstructions

Exhaust

Air-inlet

Min. 12”

above grade
or snow level

Air-inlet around
perimeter (1-2”
from wall)

Exhaust through
center

Vent Screen

Vent pipe piece to
retain vent screen

Trinity Lx │Installation and Operation Instructions Lx Series

Sidewall Termination Details – Direct Vent Installation

25

Figure 4-10(a)

Figure 4-10(b)

Two-Pipe Termination (Roof)

IPEX Concentric Termination (Roof)

Figure 4-10(c)

Figure 4-10(d)

PolyPro / InnoFlue Termination (Roof)

Exhaust only Termination (Roof)

Min. 12”

above grade
or snow level

Vent Screen

Vent pipe piece to
retain vent screen

Exhaust

Air-inlet

Vertical

Min. 18”

Horizontal

4-12” or greater

than 36”

Flashing

Min. 12”

above grade
or snow level

Vent Screen

Vent pipe piece to
retain vent screen

Exhaust center

Air-inlet around

perimeter

Flashing

Refer to documentation included with termination kit for
complete installation instructions.

Refer to documentation included with termination kit for
complete installation instructions.

Min. 12”

above grade

or snow level

Flashing

Exhaust

Air-inlet

Figure illustrates two options for exhaust termination only;
neither vent pipe illustrated is for combustion air-inlet.

Min. 12”

above grade
or snow level

Flashing

Vent pipe piece to
retain vent screen

Vent Screen

Exhaust
Option 1

Exhaust
Option 2

Lx Series Installation and Operation Instructions │Trinity Lx

Roof Termination Details – Direct Vent Installation

26

Trinity Lx │Installation and Operation Instructions Lx Series

Venting Rules and Guidelines

1. Prevailing Winds: Ensure the vent is located where it will not be exposed to normal prevailing winds.

2. Combustion Air-inlet Contamination: Air for combustion must be drawn from an area free of dust and

contaminants. Combustion air containing chemicals such as chloride, fluoride, bromine or iodine or dust and
debris will cause corrosion damage of the heat exchanger voiding your NTI warranty. Refer to Table 4-1 for
a list of corrosive products and contaminants sources to avoid.

3. Vertical Separation: The exhaust must be a minimum of 18 in. above the air inlet, and the air inlet must

always be a minimum of 12 in. plus snow allowance above any surface that will support snow. (Two feet
plus snow allowance is highly recommended). Consult your weather office for the maximum typical
snowfall for your region.
Example: New Brunswick Canada - typical maximum snowfall is 19 in., thus the inlet must be (12”+19”) =
31 in. above grade and exhaust must be (31”+18”) = 49” above grade.

4. Horizontal Separation: The horizontal distance between the inlet and exhaust must be a minimum of 4”

[102 mm] center to center.

5. Wall Flashing: Under normal operating conditions this boiler will produce a plume of white gases, and

should be taken into consideration when selecting an adequate location. A 36 in. diameter stainless, plastic,
or vinyl shield can be used to flash the exterior of the residence.

6. Flue Gas Hazard: Position the vent termination where vapors cannot make accidental contact with people

and pets or damage nearby shrubs and plants.

7. Elbow Extensions: Elbows on outside of wall must be no more than ½ in. away from the wall.

8. Vent Sloping: All indoor exhaust piping must be on a slope back to the boiler a minimum of ¼ in. per

linear foot of vent. For applications where excessive condensation is possible ½ in. per linear foot is
recommended.

9. Vent Supports: Where required Vent and Air-inlet piping shall be secured to the wall for more rigidity. All

interior vent pipe shall be supported a minimum of every 36 in..

10. Roof Exhaust: In all roof applications the discharge must point away from the pitch of the roof.

11. Roof Flashing: Install adequate flashing where the pipe enters the roof, to prevent water leakage.

12. Rain Cap: Install and seal a rain cap over existing chimney openings, in vacant chimney applications.

13. Venting Below Grade: For installations that exit the wall below grade refer to Figure 4-11.

14. Vent Screens: Install factory supplied vent screens on the outside of the last elbow for both the inlet and

exhaust vent terminal elbows. Install the screen into the female opening of the elbow, and then cut a small
piece of pipe to sandwich the screen into the elbow. NOTE: ensure the small piece of pipe cut, does not
extend past the end of the elbow. Two screens are provided in the package. See Figures 4-9 and 4-10.

15. Condensate Hazard: Do not locate vent over public walkways, driveways or parking lots. Condensate

could drip and freeze resulting in a slip hazard or damage to vehicles and machinery.

16. Warning Plate: For Sidewall Venting, install the warning plate “Gas Vent Directly Below”, directly above

(within 4 ft. vertically) the location of the air-inlet pipe, so it is visible from at least 8 ft away. See Figure 4-

9.

17. Wall Thickness: Direct vent terminations are designed to work with any standard wall thickness.

Installation guidelines for min/max wall thickness are as follows: Min. = 1 in., Max. = 60 in..

18. Venting Options: Due to potential moisture loading (build-up) along the exterior wall, sidewall venting

may not be the preferred venting option. Refer to Figures 4-8 and 4-10 for roof top venting options.

The vent for this boiler shall not terminate over public walkways; or near soffit vents or
crawl space vents or other area where condensate of vapor could create a nuisance or
hazard or cause property damage; or where condensate or vapor could cause damage or
could be detrimental to the operation of regulators, relief valves, or other equipment.

27

Figure 4-11 Venting Below Grade

For installations that exit the wall below grade:

1. Excavate site to a point below where the pipes

are to exit as shown.

2. Ensure the wall is fully sealed where the pipes

penetrate.

3. The Vent/Air-inlet piping MUST be secured to

the side of the building above grade, as shown,
to provide rigidity.

4. Optional mounting bracket P/N. 82075 for

securing the exhaust pipes (only applicable for 3
in. PVC/CPVC venting).

5. Ensure that the Vent/Air-inlet clearances are

maintained, see Section 5.0 for details.

Figure 4-12 Outdoor Venting

Vent piping outside the building is permitted under
the following conditions:

1. The maximum length outside the building is 20 ft.

Note that outdoor length must be included in the
overall vent length calculation.

2. All normal termination clearances are maintained.

3. The pipe is supported every 24 in..

4. The exhaust and inlet are sloped back to the boiler

½ in. elevation for every linear foot.

Figure 4-13 Existing Chimney Chase Way

It is permissible to use an existing chimney as a chase
way to run the Vent/Air-inlet piping as long as:

1. The chimney is not being used by any other

boiler.

2. Flue gases do not enter the vacant chimney.

3. Only Trinity Lx certified venting materials are

used, see Table 4-4.

4. Vent lengths are within the maximums specified.

5. The top of the chimney is capped and the

Vent/Air-inlet pipes are flashed to prevent
leakage into the vacant chimney.

Exhaust

Air-inlet

Wall Brackets

Supports every
24 in. [610 mm]

12 in. [305 mm] plus snow

allowance above grade

Air-Inlet

Maximum of 20 ft.
[6.1 m] is permitted
for piping outside a
building.

Exhaust
Vent

Gas Vent Directly Below

Keep Free of Obstructions

Air-Inlet

Existing
Chimney
(used as a
chase way)

Chimney
Cap

Exhaust Vent

Exhaust Vent Min.
18 in. above air­inlet

Air-Inlet
Min. 12 in. above
roof and snow level

Lx Series Installation and Operation Instructions │Trinity Lx

Under no circumstances may an existing chimney or chase-way be used to vent or
provide combustion intake air to a Trinity Lx. Failure to follow these instructions will
result in fire, property damage, serious injury or death.

28

Clearances to Air-Inlet Termination

Canada 1

USA 2

Min. Distance

Min. Distance

A

Above grade/roofline and snow level 8

12 in.

305 mm

12 in.

305 mm

B

Above roof line - Concentric Vent

6, 11, 13

24 in.

610 mm

24 in.

610 mm

C

To exhaust vent from any other boiler

36 in.

915 mm

12 in.

305 mm

Clearances to Exhaust Vent Termination

Min. Distance

Min. Distance

A

Above grade/roofline and snow level 8

12 in.

305 mm

12 in.

305 mm

D

Minimum vertical separation above air inlet 9

18 in.

457 mm

18 in.

457 mm

E

Minimum horizontal separation from air inlet 3

4 in.

102 mm

4 in.

102 mm

F

Window or door that may be opened, or other building opening

36 in.

915 mm

12 in.

305 mm

G

To combustion air inlet of any other appliance

36 in.

915 mm

12 in.

305 mm

H

Non-mechanical air supply inlet to building

36 in.

915 mm

12 in.

305 mm

I

Mechanical air supply inlet to building 4

6 ft.

1.83 m

3 ft.

915 mm

J

Soffit, overhang, eave or parapet

24 in.

610 mm

24 in.

610 mm

K

Soffit vent or vent opening in an overhang, eave or parapet

6 ft.

1.83 m

6 ft.

1.83 m

L

Outside corner 10

- - -

-

M

Inside corner of an L-shaped structure (including walls and fences)

36 in.

915 mm

36 in.

915 mm

N

Service regulator / vent outlet

36 in.

915 mm

36 in.

915 mm

P

Each side of center line above or below meter / regulator assembly 5

36 in.

915 mm

36 in.

915 mm

Q

Above a paved sidewalk, driveway, or parking lot on public property if adjacent 12

7 ft.

2.13 m

7 ft.

2.13 m

R

Above a public walkway

X X X

X

S

Above a sidewalk or paved driveway that is located between two single family
dwellings and services both dwellings

X X X

X

T

Under a concrete veranda, porch, deck, or balcony 7

24 in.

610 mm

24 in.

610 mm

U

Above, under or near exterior stairs

X X X

X

V

Into a canopy or carport

X X X

X

Notes:

1 - Canadian installations must comply with the current CSA B149.1 Natural Gas and Propane Installation Code and local

building codes.
2 - US installations must comply with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code and local building codes.
3 - Horizontal separation center-to-center (c.c.) 4”-12” (102-305 mm).

4 - For US installations, an exhaust vent must be 3 ft above a mechanical air supply inlet if within 10 ft. [3 m] horizontally.
5 - Horizontal clearance must be observed up to a height of 15 ft. [4.6 m] above/below the meter, regulator, or relief devices.
6 - Concentric Vent must protrude from the roof precisely 24” [610 mm] measuring from the terminal end-cap vanes.
7 - Permitted if veranda, porch, deck, or balcony is made of concrete and a minimum of two sides are fully open beneath.
8 - 24” is the recommended snow level allowance above grade/roofline or any surface that will support snow, debris, or ice

(i.e. for roof venting clearances - roofline and snow level). If living in a snowfall region, consult your local weather
office for the maximum typical snowfall for your area.

9 - Note that the vent must maintain a minimum vertical distance above the air-inlet. Example: Vent height = 18” (457

mm) above air inlet + 12” (305 mm) for air inlet above grade/roof line and snow level = 30” (762 mm) above grade and

snow level.
10 - Clearances to an outside corner to be in accordance with local installation codes.
11 - In Canada, concentric vent materials are subject to approval by local inspectors. See Termination Kits in Section 4.0.
12 - Above public walkways, driveways or parking lots if adjacent to it and condensate cannot drip, freeze, or create a hazard.

13 - Contact the manufacturer for special exemptions relating to multiple boiler installations using concentric vents.

Trinity Lx │Installation and Operation Instructions Lx Series

5.0 VENT AND AIR-INTAKE TERMINATION CLEARANCES

The instructions detailed in this section are a combination of Trinity Lx specific and National Gas Code
restrictions. Compliance alone doesn’t insure a satisfactory installation as good common sense must also be
applied. Failure to follow these instructions may result in fire, property damage, serious injury or death.

Table 5-1 Termination Clearances Quick Reference Table

The quick reference table below is to be read in conjunction with the numbered notes as
indicated, Figures 5-1 through 5-6, and the Venting Rules and Guidelines in Section 4.0.

29

Lx Series Installation and Operation Instructions │Trinity Lx

Figure 5-1 Termination Clearances Quick Reference Diagram

30

Figure 5-2 Sidewall Termination Clearances (See Table 5-1)

G – Letter represents a specific Termination Position. Refer to Table 5-1 for corresponding termination clearances.

Concentric Vent
Termination

Q

Two-Pipe
Termination

F

Clearance “Q”
Adjacent to Public
Walkway or Driveway
Minimum 7ft. [2.13 m]

G

Clearances “F” and “G”
Canada – Minimum 3 ft. [915 mm]
The US – Minimum 1 ft. [305 mm]

Trinity Lx │Installation and Operation Instructions Lx Series

31

Figure 6-1 All Models

Condensate Drain Piping

Drain Vent

Do not block or install piping into
the top branch of the condensate
drain tee.

Drain Pipe
Connection to the bottom of the

condensate drain tee must be made
using 1/2” Schedule 40 PVC pipe.
Secure using appropriate PVC
cement. All piping must be below
the level where the condensate
leaves the boiler.

Floor Drain

Check with your local authorities
regarding disposal of condensate
(regulation may require the use of a
neutralizer).

Lx Series Installation and Operation Instructions │Trinity Lx

6.0 CONDENSATE DRAIN

This unit produces liquid condensate in the heat exchanger and venting system as a product of combustion.
Steps must be taken to ensure that condensate does not collect in the venting system; therefore, all exhaust
piping must slope back to the boiler a minimum 1/4” per linear foot of vent. Condensate must be drained from
the unit into a household drain.

condensate must be neutralized prior to entering a drain).
The following are important notes that must be taken into consideration when constructing the condensate drain

system (See Figure 6-1 for further details):

 DO NOT install condensate lines outside. A frozen or blocked drain will cause the condensate to fill the

combustion chamber. This will result in a no heat condition, as the unit will shut down, and damage to the
flame sensor, and components can occur.

 NEVER use copper, steel, or galvanized piping in the construction of the condensate disposal system as

condensate is very corrosive and will corrode most metallic drains and sewer pipes.

 When a condensate pump is used or required, select a pump that is designed for residential furnaces.

the boiler must be inspected for component damage, e.g. the internal insulation at the front and back of the
chamber. Failure to follow these instructions may result in fire, property damage, serious injury or death.

Check with your municipality, or local gas company to determine if the disposal of
combustion condensate is permitted in your area (e.g. in the State of Massachusetts the

If the combustion chamber has been flooded due to the condensate drain backing up, or
for any other reason, the combustion chamber door must be removed and the inside of

32

Model Number

LP Conversion Kit Number

LP Orifice

Lx150-200

82650-1

52 (5.2 mm)

Lx300

82650-1

62 (6.2 mm)

Lx400

83017-1

62 (6.2 mm)

Lx500

84386-1

No Orifice

1

Notes:

1

No LP orifice is used with model Lx500, see conversion kit instructions for

information on adjusting the throttle screw convert boiler to LP.

2

Models Lx600-800 cannot be operated with LP – Propane. Use Natural Gas

only.

Trinity Lx │Installation and Operation Instructions Lx Series

7.0 INSTALLING GAS PIPING

Conversion Kit (see Table 7-1) must be installed prior to installing the gas piping to the boiler. Failure to
properly convert the unit to operate with Propane may result in property damage, serious injury or death.

Codes as they may require appliances fueled with LP gas to be provided with an approved means of removing
unburned gases from the room. Failure to follow these instructions may result in serious injury or death.

Table 7-1 Natural Gas to LP Propane Conversion Kit

The Trinity Lx is factory equipped to operate with Natural Gas, the installation of a
conversion kit is required prior to operating with Propane Gas. The Natural to LP

Liquefied Petroleum (LP) propane gas is heavier than air. Do not install the boiler in a pit
or similar location that will permit heavier than air gas to collect. Check with Local

Installation

Refer to the current National Fuel Gas Code ANSI Z223.1/NFPA 54 or CAN/CGA B149.1 installation codes,
and local codes for gas piping requirements and sizing. Pipe size running to the unit depends on:

 Length of pipe.
 Number of fittings.
 Type of gas.
 Maximum input requirement of all gas appliances in the residence.

Ensure that:

 The gas line connection to the boiler does not apply any weight to the gas valve. NTI recommends using

approved flexible gas piping (if acceptable by local codes) to connect the boiler to the gas supply (See
Figure 7-1 for details).

 You plan the installation so that the piping does not interfere with the vent pipe, or the removal of the valve,

burner, and serviceable components.

 The boiler shall be installed such that the gas ignition system components are protected from water

(dripping, spraying, rain etc.) during installation and servicing.

 The gas piping is large enough for all the appliances in the home. No appreciable drop in line pressure

should occur when any unit (or combination of units) lights or runs. Use common gas-line sizing practices.

 Always use a pipe-threading compound that is resistant to propane (LP) gas solvent action. Apply sparingly

to all male threads, starting at two threads from the end. Over doping or applying dope to the female end,
can result in a blocked gas line.

 DO NOT TIGHTEN FITTINGS WITHOUT SUPPORTING THE GAS VALVE as damage to the gas valve

or combustion blower can occur.

 Install a manual “Equipment Shut-Off Valve” as shown in Figure 7-1. Valve must be listed by a nationally

recognized testing lab.

 The gas line piping can safely be removed from the boiler for servicing, by strategically placing the gas line

shutoff and union; see example in Figure 7-1.

 All gas piping, including gas components in the boiler, are checked for leaks using a “Bubble Test”, prior to

operating the boiler.

33

Figure 7-1 Gas Line Connection (Typical)

Model Lx200 Illustrated

Manual Shutoff Valve

Union

Drip Leg

Rigid Gas Line Piping

Use only rigid gas line piping within the
appliance cabinet. Rigid piping must
protrude beyond the outside of the
cabinet wall.

Flexible Gas Line Piping

Recommended to eliminate strain
on the appliance gas components
(only use if acceptable by local
codes).

Manual Shutoff Valve - Should
overheating occur or the gas
supply fail to shut off, turn off the
manual gas control valve to the
appliance.

Lx Series Installation and Operation Instructions │Trinity Lx

Strain on the gas valve and fittings may result in vibration, premature component failure
and leakage and may result in a fire, explosion, property damage, serious injury or death.

Flexible gas piping cannot be used within the boiler cabinet and cannot pass through the
cabinet wall, use rigid piping as shown in Figure 7-1. Failure to follow these instructions
may result in fire, property damage, serious injury or death.

Do not use an open flame to test for gas leaks. Failure to follow these instructions may
result in fire, property damage, serious injury or death .

When performing a pressure test on the gas line piping, be sure the boiler is disconnected
or isolated if the test pressure is expected to exceed 1/2 PSI (14” w.c.), as damage to the
valve could occur resulting in fire, property damage, serious injury or death.

34

Trinity Lx │Installation and Operation Instructions Lx Series

8.0 LIGHTING THE BOILER

Before Start-up refer to Mandatory Pre-commissioning Procedure for Plastic Venting
in Section 4.0. Failure to follow these instructions can result in explosions, injury or death.

Prior to turning the gas supply on and lighting the boiler, ensure all aspects of the

installation are complete and in conformance with the instructions provided in this
manual, including the Vent/Air-Intake, Condensate Drain, and System Water Piping. Failure to precisely follow
these instructions will cause a fire or explosion resulting in property damage, serious injury or death.

A) This boiler 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 boiler 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 boiler.

• 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 boiler if any part has been under water. Immediately call a qualified service technician
to inspect the boiler and to replace any part of the control system and any gas control which has been
under water.

1. STOP! Read the safety information above very carefully.

2. Set the thermostat to lowest setting. Turn off all electric power to the boiler.

3. This boiler 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 boiler.

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 Boiler” and call your service

technician or gas supplier.

1. STOP! Read the safety information above very carefully.

2. Turn off all electric power to the boiler.

3. Turn the manual gas valve to the OFF position.

Do not store or use gasoline or other flammable vapors & liquids in the vicinity of this or
any other appliance. Failure to follow instructions could result in explosion causing
property damage, serious injury or death.

If you do not follow these instructions exactly, a fire or explosion may result causing
property damage, serious injury or death.

Should overheating occur or the gas supply fail to shut off, turn off the manual gas
control valve to the boiler. Failure to follow instructions could result in explosion
causing property damage, serious injury or death.

FOR YOUR SAFETY, READ BEFORE OPERATING_

OPERATING INSTRUCTIONS_

TO TURN OFF GAS TO THE BOILER_

35

Lx Series Installation and Operation Instructions │Trinity Lx

The initial lighting of the boiler must be performed by a licensed Gas Technician.
Failure to follow instructions may result in property damage, serious injury or death.

 Ensure the boiler is wired in accordance with this manual.
 Ensure the gas shut-off valve is turned on, and that the gas system has been fully tested for leaks.
 Ensure the system is completely filled with water, and that ALL the air is purged out.

Allow primers/cements to cure for 8 hours prior to Start-up. If curing time is less than 8
hours, first perform Steps 2 through 6 of Mandatory Pre-commissioning Procedure for
Plastic Venting in Section 4.0. Failure to follow these instructions can result in explosion,
serious injury or death.

Initial Start-Up

1. Turn on power to the Trinity Lx and turn-up the Thermostat(s). The boiler should run through a purge, and

combustion should occur. (The control system has a built in ignition retry, allowing the system to try at least
three times, before locking-out.)

2. With the unit operating at full capacity, verify that the gas line pressure is 5.5-10.5 inches w.c. for Natural

gas, and 9-13 inches w.c. for Propane (See Section 9.0 for details).

3. Using an appropriate Oxygen or Carbon Dioxide analyzer, take a sample of the flue gas. The sample must

fall within the acceptable ranges for Carbon Dioxide, which is 8.8% - 9.8% for Natural gas, and 9.8%-10.8%
for propane (See Section 9.0 for details).

4. Perform at least three lights in succession to ensure proper operation.

5. After the three successive lights, unplug the flame probe, and allow the unit to cycle again. Ensure that it

tries to light, and locks out on safety reset. Once you have successfully activated the flame safety system,
replace the wire on the flame sensor, and reconfirm proper lighting.

If the unit fails to light consistently and smoothly, contact NTI for technical assistance at
1-800-688-2575. Never allow the boiler to operate if the ignition or operation of the
burner is rough or erratic. Failure to follow these instructions may result in serious injury
or death.

The flame probe uses a single electrode located in the burner door at the 6 O’clock
position. DO NOT remove the wire from the dual electrode located in the burner door at

the 3 O’clock position; this device is used for spark igniting and delivers a high voltage

potential which would result in an EXTREME ELECTRICAL SHOCK possibly causing
serious injury or death.

Re-lighting Unit

1. Stop and read these instructions very carefully.

2. Set the thermostat to the lowest setting, and then turn off all power to the boiler.

3. This boiler does not have a pilot. It is equipped with an ignition device that automatically lights the burner.

Do not try to light the burner by hand.

4. Turn the gas shut-off valve to the off position, and then remove the front cover.

5. Wait five (5) minutes to clear out any gas. Then check for gas, including near the floor. If you smell gas

“Stop” and follow “B” above. If you don’t detect any gas proceed to the next step.

6. Turn the gas shut-off valve to the on position, wait an addition five (5) minutes and check for gas.

7. Replace the front cover.

8. Set the thermostat to the highest setting, and then turn on all power to the boiler.

9. Ignition sequence is automatic, combustion will occur after a brief fan purge. Ignition will retry 3 times.

10. If ignition does not occur, “Turn off the gas and electricity to the boiler” and contact a professional service

technician, or gas supplier.

Turning Off The Boiler

1. Set the thermostat to the lowest setting, and then turn off all power to the boiler.

2. Turn the gas shut-off valve to the off position.

36

Gas

Line Pressure (inches wc)

CO2 (%) 1

CO (ppm)

Max.

Nominal/Desired

Min.

Max.

Min.

Max.

Natural

7

4 2

10.5

8.8

9.8

175

Propane

11 8 13

9.8

10.8

175

Notes:

1

It is permissible to have higher CO2 values with the burner operating at the minimum modulation rate.

2

The minimum permissible line pressure when operating with Natural Gas is 5.5 inches wc for model Lx500.

Modulation
Rates (rpm)

Lx150

Lx150E

Lx200

Lx300

Lx400

Lx500

Lx600

Lx700

Lx800

Minimum

1150

925

925

1250

1550

1400

1050

1250

1250

Maximum

5850

4450

5950

5850

7250

6400

4350

4300

5300

Trinity Lx │Installation and Operation Instructions Lx Series

9.0 GAS VALVE AND BURNER SET-UP

Gas Line Pressure

The boiler gas valve is equipped with a line pressure test port; see Figures 9-1 through 9-4. Use the following
procedure to measure the gas line pressure to the boiler to ensure if falls within the range given in Table 9-1:

1. Turn the supply of gas to the boiler off.

2. Open the bleed screw of the line pressure test port approximately 1-1/2 turns (Lx150-500 models). This

port is directly connected to the gas line feeding the boiler. For Lx600-800 models, replace 1/8” NPT plug
in the inlet flange of the gas valve with a hose barb fitting suitable for manometer tubing used. See Figures
9-1 through 9-5.

3. Force 1/4 ID tubing over the housing of the line pressure test port; install the other end of the tubing to an

appropriate line pressure test gauge or manometer. Ensure both ends of the tubing make a tight connection.

4. Open the supply of gas to the boiler and check for gas leaks.

5. Observe the line pressure under static conditions and compare it to Table 9-1. The pressure will be greatest

under static conditions.

6. With all other gas appliances in the applications running, operate the burner to the maximum firing rate (see

Table 9-2) and compare the observed line pressure with Table 9-1. The pressure will be lowest during the
maximum flow of gas.

7. Adjust the gas line pressure to ensure the parameters in Table 9-1 are attained under all conditions. If

possible adjust the line pressure to the "Nominal/Desired" value listed in Table 9-1, while the unit is
operating at the maximum modulation rate, see Table 9-2.

8. Continue observing the gas line pressure until the completion of the combustion analyses, incase

adjustments need to be made.

9. Upon completion of the line pressure testing, return the bleed screw of the Line Pressure Test Port to the

closed position. For the Lx600-800 models, replace the installed hose barb fitting with the factory 1/8” NPT
plug; use NG/LP approved thread sealant.

Table 9-1 Line Pressure and Combustion Parameters

The Trinity Lx gas valve must be set-up by a licensed Gas Technician. Improper set-up
may result in incorrect operation, damage to components or property, injury or death.

The line pressure is a function of the gas supply and is affected solely by field provided
parameters such as line size and regulator settings. Under no circumstances can the boiler
gas valve influence or be used to adjust the gas line pressure.

Failure to close the bleed screw of the Line Pressure Test Port will cause a severe leakage
of gas, resulting in a fire or explosion causing property damage, serious injury or death.

Table 9-2 Minimum and Maximum Modulation Rates

Carbon Monoxide - Never leave the boiler operating if emitting Carbon Monoxide (CO)

concentrations in excess of 175ppm. Failure to comply may result in injury of death.
Manifold Pressure - DO NOT adjust or measure the Manifold Pressure of the boiler.

Correct manifold pressure is factory set. Field adjustment could result in improper burner
operation resulting in fire, explosion, property damage or death.

37

Figure 9-1 Gas Valve and Venturi Assembly (Lx150-300)

Lx150 Orientation Illustrated

Figure 9-2 Gas Valve and Venturi Assembly (Lx150-300)

Lx150E/Lx200 Orientation Illustrated

Orifice Location
(See Kit 82650-1)

Gas Valve

Air-inlet

Manifold Pressure
Test Port

Line Pressure
Test Port

Throttle/Input
Adjustment Screw

Venturi

Gas In

Orifice Location
(See Kit 82650-1)

Throttle/Input Adjustment
Screw

Line Pressure
Test Port

Gas In

Lx150E/Lx200

Orientation Illustrated

Lx300 Assembly Orientation

Rotated Clockwise 90

o

Venturi

Air-inlet

Manifold Pressure
Test Port

Gas Valve

Lx Series Installation and Operation Instructions │Trinity Lx

38

Figure 9-3 Gas Valve and Venturi Assembly (Lx400)

Figure 9-4 Gas Valve and Venturi Assembly (Lx500)

Throttle/Input
Adjustment Screw

Venturi

Air Inlet

Line Pressure
Test Port

Gas In

Gas Valve

Orifice Location
(See Kit 83017-1)

Manifold Pressure
Test Port

Gas In

Gas Valve

Throttle/Input
Adjustment Screw

Manifold Pressure
Test Port

Line Pressure
Test Port

Trinity Lx │Installation and Operation Instructions Lx Series

39

Figure 9-5 Gas Valve and Venturi Assembly (Lx600-800)

Throttle/Input
Adjustment Screw

Manifold Pressure
Test Port (outlet
flange)

Gas Valve

Venturi

Manual Gas
Shutoff Valve

Air-inlet

Gas In

Line Pressure
Test Port
(inlet flange)

Remove cover to
make adjustments
to the throttle/input
screw

Gas Valve
Regulator
Sensing
Tube

Lx Series Installation and Operation Instructions │Trinity Lx

Adjustment

Input Screw Adjustments - The boiler is equipped with a Throttle/Input Adjustment Screw, located on the Gas

Valve and Venturi Assembly. The Throttle screw is used to adjust the flow of gas leaving the gas valve,
entering the Venturi and hence entering the combustion air stream. By turning the adjustment screw in,
clockwise, the flow of gas is reduced and the combustion becomes leaner, thus reducing the concentration of
CO2 in the flue gases. To increase the CO2 the Throttle screw must be adjusted out, counterclockwise, thus
increasing the flow of gas from the gas valve to the combustion air stream. See Figure 9-6 for screw direction.

Lx150-300 Adjustments - The throttle screw for models Lx150-300 is a multiple turn valve. Typical adjustment

required for Natural Gas is 0-1 full turns in or out from the factory setting. Typical adjustment for LP Gas is
0-3 full turns in or out from the factory setting upon inserting the LP orifice as per the applicable Propane
conversion instructions. See Figures 9-1 and 9-2 for throttle screw location.

Lx400 Adjustments - The throttle screw for the Lx400 is a geared valve with a 4:1 ratio. Adjusting the throttle

screw 4 complete turns will return the valve to the original location, 2 turns from fully open will completely
close the valve. Typical adjustment required is 0-1/4 turn in or out from the factory setting. See Figure 9-3 for
throttle screw location.

Lx500 Adjustments – The throttle screw for the Lx500 is a multiple turn valve. Typical adjustment required for

Natural Gas is 0-1 full turns in or out from the factory setting. To adjust combustion for Propane Gas, turn
the throttle screw all the way in (clockwise until it stops), then turn the throttle screw out (counterclockwise)
4-1/2 turns and set with a combustion analyzer. See Figure 9-4 for throttle screw location.

Lx600-800 Adjustments - Remove the cap and adjust the input screw by turning it clockwise to decrease gas

flow and counter-clockwise to increase gas flow. Typical adjustment required is 0-1/8 turns in or out. See
Figure 9-5 for throttle screw location.

40

Figure 9-6 Throttle/Input Adjustment Screw (All Models)

Decrease Gas - Turn Clockwise

Increase Gas - Turn Counter Clockwise

IF FOR ANY REASON THE INPUT SCREW IS ADJUSTED, A "COMBUSTION ANALYZER"
MUST BE USED TO ENSURE SAFE AND PROPER OPERATION OF THE GAS VALVE.

Trinity Lx │Installation and Operation Instructions Lx Series

Adjustments to the Throttle screw may only be made by a qualified gas technician, while
using a calibrated combustion analyzer capable of measuring CO2 and CO. Failure to

Combustion Calibration - To calibrate burner operation, perform the following procedure using a calibrated

combustion analyzer capable of measuring CO2 and CO from Natural and Propane Gas burning appliances:

1. Operate the unit at the maximum modulation rate, see Table 9-2.

2. Ensure the gas line pressure is maintained within tolerance, see Table 9-1.

3. While at the maximum modulation rate, measure the CO2 and CO; adjust as necessary, using the Throttle

Screw, to be within the limits listed in Table 9-1.

4. Operate the unit at the minimum modulation rate (Table 9-2). Ensure the combustion remains smooth and

CO2 and CO remain within the limits (Table 9-1). If not, do not adjust further, contact NTI for assistance.

Flue Gas Analysis and Adjustment

Each Trinity Lx is factory set to operate with Natural Gas, for boilers field converted to operate with Propane
Gas, a flue gas analysis and adjustment is mandatory. See Table 7-1 and propane conversion instructions.

Lx500 to operate with Propane Gas requires field calibration of the throttle/input screw; see “Lx500

Adjustments” in Section 9.0 and Propane conversion instructions. Models Lx600-800 only operate with Natural

Gas; conversion to Propane is not an option. Failure to follow these instructions will result in property damage,
personal injury or death.

Analysis - Trinity Lx flue gas test ports are located in the flue outlet adapter assembly. Test port access is either

from inside the boiler cabinet (Lx150, Lx150E & Lx200; Figure 9-7) or from outside the boiler cabinet
(Lx300-800; Figures 9-8 through 9-10). Remove the test port plug, perform flue gas analysis, and adjust
throttle/input screw as required until CO2 and CO levels are within acceptable limits, see Table 9-1 Line
Pressure and Combustion Parameters. Once flue gas sampling completed, re-install test port plug. For model
with a threaded plug, seal threads with Teflon tape before reinstalling plug.

follow these instructions may result in serious injury or death.
Adjustments to the Throttle screw may only be performed if the gas line pressure is

maintained above minimum levels throughout the duration of the test; see Table 9-1.
Failure to follow these instructions may result in serious injury or death.

Models Lx150-400 require the installation of an LP orifice prior to operating with
Propane Gas, see Propane conversion instructions for more details. To convert the

Failure to perform the flue gas analysis and adjustment detailed in this section may result
in erratic and unreliable burner operation, leading to reduced efficiency, increased fuel
consumption, reduced component life, heat exchanger combustion deposits, and general
unsafe operation. Failure to follow these instructions may result in serious injury or
death.

Failure to re-install the test port plug will result in damage to the unit, property damage,
fire, explosion, serious injury or death.

41

Figure 9-7 Flue Gas Sampling Using Test Port (Lx150-200)

Figure 9-8 Flue Gas Sampling Using Test Port (Lx300-400)

Test Port

Combustion

Analyzer

FLUE GAS TEST PORT PLUG - Remove test

port plug to perform flue gas analysis. Re-install
plug once sampling completed to prevent flue gas
leakage during appliance operation. Failure to
comply with these instructions will result in serious
injury or death.

Combustion

Analyzer

Test Port

FLUE GAS TEST PORT PLUG - Remove test

port plug to perform flue gas analysis. Re-install
plug once sampling completed to prevent flue gas
leakage during appliance operation. Failure to
comply with these instructions will result in serious
injury or death.

Lx Series Installation and Operation Instructions │Trinity Lx

42

Figure 9-9 Flue Gas Sampling Using Test Port (Lx500-600)

Figure 9-10 Flue Gas Sampling Using Test Port (Lx700-800)

Test Port

Combustion

Analyzer

FLUE GAS TEST PORT PLUG - Remove test

port plug to perform flue gas analysis. Re-install
plug once sampling completed to prevent flue gas
leakage during appliance operation. Failure to
comply with these instructions will result in serious
injury or death.

Combustion

Analyzer

Test Port

FLUE GAS TEST PORT PLUG

Remove test port plug to perform
flue gas analysis. Re-install plug
once sampling completed to prevent
flue gas leakage during appliance
operation. Failure to comply with
these instructions will result in
serious injury or death.

Trinity Lx │Installation and Operation Instructions Lx Series

43

Table 10-1 Boiler System Cleansers and Corrosion Inhibitors

Application

Fernox Product

NTI Part #

Description

Boiler Water Treatment

F1 Protector

83448

Corrosion inhibitor.

Cleanser for new and old systems

F3 Cleaner

83449

Removes flux, grease and carbon residue.

Cleanser for Retrofits

DS-40 System Cleaner

83450

Removes heavy limescale and sludge deposits.

 PH – between 7.5 and 9.5.

 Iron – less than 0.5mg/l.

 Chloride – less than 125mg/l.

 Copper – less than 0.1mg/l.

 Conductivity – 100 to 300µS/cm (at 25ºC); [TDS 50 to 150ppm or Total Hardness 3 to 9grains/USgal.]

Lx Series Installation and Operation Instructions │Trinity Lx

10.0 BOILER AND HEATING SYSTEM PIPING

The heat exchanger of the Trinity boiler is designed to attain the highest level of heat transfer in a compact
design. To accomplish this, the heating water flows through a series of fin shaped tubes, designed to maximize
the heat transfer area. To maintain the efficient and reliable operation of the heat exchanger, and to avoid heat
exchanger failure, it is critical to ensure the rules and guidelines in this section are followed.

Failure to follow the instructions provided in this section will void the NTI warranty and
may result in property damage, fire, serious injury or death.

Boiler System Preparation

Prior to connecting plumbing to the boiler, flush the entire system to ensure it is free of sediment, flux, solder,
scale, debris or other impurities that may be harmful to the system and boiler. During the assembly of the
heating system, it is important to keep the inside of the piping free of any debris including construction and
copper dust, sand and dirt.

For retrofits, all system piping including radiators, must be cleansed of all build-up including sludge and scale.
All systems, old and new, must be cleansed to remove flux, grease and carbon residue. NTI recommends
cleansing the boiler system with “Fernox F3 Cleaner”. For retrofit applications with heavy limescale and sludge
deposits, a heavier duty cleaner may be required; NTI recommends the use of “Fernox DS-40 System Cleaner”.
For information on performing the cleansing, follow the instructions included with the Fernox DS-40 System
Cleaner. See Table 10-1 for a list of recommended boiler cleansing products.

Failure to rid the heating system of the contaminants listed above will void your NTI
warranty and may result in premature heat exchanger failure and property damage.

Boiler Water

Pressure - The Trinity boilers are intended solely for use in pressurized closed loop heating systems operating

with a minimum pressure of 15 PSI at the boiler outlet. To obtain the minimum system design pressure,
follow the piping diagrams illustrated in this section.

Oxygen Elimination - This boiler may only be installed in a pressurized closed-loop heating system, free of air

(oxygen) and other impurities. To avoid the presence of oxygen, ensure all of the air is removed from the
system during commissioning via strategically placed adequately sized air-removal devices, located
throughout the heating system. See figures in this section detailing the location of the primary air-removal
device required for the boiler. Immediately repair any leaks in the system plumbing to avoid the addition of
make-up water; make-up water provides a source of oxygen and minerals that may lead to heat exchanger
failure. Failure to follow these instructions will result in poor performance, unnecessary wear of system
components and premature failure.

The Trinity Lx is not approved for operation in an “open system”, thus it cannot be used
for direct potable water heating or process heating of any kind.

Water Chemistry – The installer of the Trinity Lx boiler must consider the condition of the water in the heating

system. Ensure the condition of the boiler water falls within the following parameters:

44

Table 10-2 Pressure Relief Valve Specifications

Boiler
Model

Maximum Pressure Relief Valve Setting

/ Boiler MAWP (psi)

Minimum Pressure Relief

Valve Capacity (MBH)

Lx150

30

150

Lx150E

145

150

Lx200

145

200

Lx300

160

300

Lx400

145

400

Lx500

160

500

Lx600

160

600

Lx700

160

700

Lx800

160

800

Notes:

1

Lx150 models sold in US have a MAWP = 145 psi.

Trinity Lx │Installation and Operation Instructions Lx Series

Treatment - Boiler water that falls outside of the conditions listed above must be treated with a corrosion

inhibitor. Each Trinity Lx boiler is provided with at least 1 bottle of “Fernox F1” corrosion inhibitor (Lx500­800 come with 2 bottles), adequate to treat a 26.4 gallon (100 liter) heating system to a minimum required
concentration of 0.5%. Systems with greater volume will require more inhibitor. For information on
performing the treatment, follow the instructions included with the Fernox F1 Protector. See Table 10-1 for a
list of recommended boiler system cleansers and corrosion inhibitors.

Anti-freeze - For systems requiring freeze protection, use only inhibited propylene glycol, specially formulated

for hydronic heating systems; use of other types of antifreeze may be harmful to the system and will void the
warranty. Note: the use of glycol may reduce the usable output capacity of the boiler, thus requiring the unit
to be “de-rated” by limiting the maximum operating capacity and/or the maximum water temperature. NTI
recommends against exceeding 35% concentration of glycol.

Near Boiler Plumbing

Pressure Relief Valve - A Pressure Relief Valve is factory supplied with each unit and must be field installed at

the boiler outlet in the vertical position, as shown in Figures 10-1(a) and (b), with the drain pipe outlet exiting
the side of the pressure relief valve horizontally and elbowing down. Lx150-400 models come with a 30 psi
relief valve, while Lx500-800 models come with a 50 psi relief valve. The maximum allowable working
pressure (MAWP) varies with boiler model, see Table 10-2; alternate relief valves may be used, so long as
they are ASME certified and meet the requirements for the respective boiler.

Pressure Gauge – Trinity Lx units come with a factory supplied Pressure Gauge. The pressure gauge must be

installed at the boiler outlet, prior to any circulators, and in the vicinity of the pressure relief valve. See
Figures 10-1(a) and (b).

To maintain protection, the level of corrosion inhibitor must be monitored periodically
for the correct concentration.

DO NOT use inhibited glycol with non-compatible boiler inhibitors. Non-compatible
inhibitors may counteract each other rendering them ineffective.

If installed with the incorrect orientation (horizontally with drain pipe out the bottom) the
relief valve may not function properly resulting in property damage or personal injury.

Ensure the discharge of the pressure relief is piped to a location where the steam or water
will not cause property damage or serious injury.

45

Figure 10-1(a) Near Boiler Piping (Lx150-400)

Figure 10-1(b) Near Boiler Piping (Lx500-800)

Pressure Relief
Valve discharge
to floor drain

Outlet

To Boiler and
system plumbing.
Refer to piping
diagrams.

Mandatory Safety
Flow Switch

Pressure Gauge

Pressure Relief Valve

Inlet

Pressure Relief
Valve discharge
to floor drain

Near Boiler
tees and
fittings

Safety Flow Switch

Pressure Relief Valve

Pressure Gauge

Trim-able paddle

Outlet

Inlet

Lx Series Installation and Operation Instructions │Trinity Lx

46

Factory Supplied Components

Field Supplied Components

 Pressure Relief Valve 1

 Boiler Loop Circulator (Pump B in Figure 10-2 or Pump C in Figure 10-3)

 Pressure Gauge

 DHW Loop Circulator (Pump A in Figure 10-2 and Figure 10-3, for

applications utilizing Indirect Fired Water Heater only)

 Flow Switch (Lx500-800 only)

 Central Heat (CH) Loop Circulator(s)

(CH Circulator - Pump C in Figure 10-2; Zone Circulators in Figure 10-3)

 Central Air Removal Devices (i.e. Micro Bubbler or Air-Scoop)

 Pressure Regulating “Fill Valve”

 Backflow Preventor

 Expansion Tank

Notes:

1

Refer to Table 10-2 for a list minimum Pressure Relief Valve specifications.

Trinity Lx │Installation and Operation Instructions Lx Series

Low Water Cutoff (LWCO) / Safety Flow Switch – Trinity Lx150-400 boilers are provided with a factory

installed Water Pressure Switch; in the event the pressure drops below 10 psi, the burner is inhibited from
firing. Where required by the Authority having jurisdiction, an external LWCO, or Safety Flow Switch, may
have to be installed; see Figures 10-1(a) and (b) for Safety Flow Switch installation.

Boiler System Plumbing

The Trinity Lx boiler uses a low mass heat exchanger that requires a minimum rate of forced water circulation
any time the burner is operating (See Table 10-4 for minimum flow rates). To ensure the minimum flow rate is
attained, the boiler must be installed in a “Primary/Secondary” plumbing configuration utilizing “Closely Spaced
Tees” to de-couple the Boiler-Primary loop from the System-Secondary loop(s) (see Figures 10-2 and 10-3 for
examples). As well as a Primary/Secondary Loop Configuration utilizing closely spaced tees, a properly installed
system will as a minimum include the major components in Table 10-3.

Table 10-3 System Major Component Checklist

When using a Safety Flow Switch, it must be installed on the boiler outlet fitting (see
Figure 10-1) in accordance with the instructions provided with the flow switch. Install
the flow switch in a 1” diameter line for models Lx150-200, and a 1-1/4” diameter line
for models Lx300-400.

Models Lx500-800 come equipped with a factory installed flow switch installed in a 2”
diameter line. The flow switch is pre-plumbed with a Nema 4 rated enclosure and
prewired via liquid-tight conduit. According to ASME CSD-1, a flow switch must be
used in lieu of a Low Water Cut Off (LWCO) for a water tube boiler.

When external safety devices are used, such as a LWCO, Flow Switch, or a Temperature
Limiting Switch, they must be wired as per the instructions provided in this manual.
Refer to Section 12.0 for wiring instructions.

Circulating Pumps – Trinity Lx150-400 boilers are equipped with three 120VAC pump outputs, while the

Lx500-800 is equipped with 3 pump contacts (relays):

1. PUMP A “DHW Pump” - operates during a Domestic Hot Water demand

2. PUMP B “Boiler Pump” - operates during any demand

3. PUMP C “CH Pump” - operates during a Central Heat demand (CH1 or CH2)
Ensure pumps are oriented as per the manufacturers’ instructions. Wiring of these circulators will depend on the

system configuration chosen; see Figures 10-2 and 10-3. For further wiring details see Section 12.0.

Circulators responsible for forcing the water flow rate through the boiler must be sized
according to Table 10-4, see Figures 10-2 and 10-3 for details.

Failure to ensure the minimum water flow rate through the boiler when the burner is on
will not only reduce the operating efficiency of the boiler, but may also cause premature
failure, overheating and void the warranty. Failure to follow instructions may result in
fire, property damage, serious injury or death.

Lx Series Installation and Operation Instructions │Trinity Lx

47

Model

Restriction

Head Loss

Minimum

Pipe Size

Min. Flow

(GPM)

Max Temp.

Rise

Minimum Primary Loop Pump Size

B&G

Grundfos

Taco

Armstrong

150

8' at 7 GPM

1"

6

45F

NRF-36

UPS 15-58

1

0011

Astro 50

150E

4' at 7 GPM

1"

6

45F

NRF-22

1

UPS 15-58

1

0011

Astro 30

200

7' at 10 GPM

1-1/4"

8

45F

NRF-36

UPS 26-99

0011

Astro 50

300

7' at 14 GPM

1-1/4"

11

45F

NRF-36

UPS 26-99

0011

1

E7

400

10' at 20 GPM

1-1/2"

16

45F

NRF-36

UPS 26-99

0011

1

E8

500

12' at 25 GPM

2"

20

45F

PL-36

1

UP 43-100

2400-20

1, 3

E8

1

600

10' at 30 GPM

2"

24

45F

PL-55 5

UPS 26-150

2400-45 4

E15 1

700

9' at 35 GPM

2"

28

45F

PL-55 5

UPS 26-150

1

2400-45 4

E15 1

800

11' at 40 GPM

2"

32

45F

PL-55

5

UP 43-110 2

2400-45 4

E15 1

Notes:

1

NOT recommended for DHW indirect circulator when installed as per Figure 10-3, recommend higher head circulator.

2

Grundfos UPS 32-160 can be used in place of UP 43-110; Grundfos UPS 26-150 can be used in place of UPS 43-100.

3

Taco 2400-40 NOT recommended.

4

Taco 2400-60 NOT recommended.

5

B&G PL-75 and PL-130 NOT recommended.

Table 10-4 Minimum Circulator and Pipe Sizes

Air Removal – The boiler and system plumbing layout must be configured to promote the removal of air from

the water. Air vents and bleeders must be strategically placed throughout the system to aid in purging the air
from the system during commissioning of the boiler. The system must also employ the use of a strategically
located air removal device, such as an air scoop or micro-bubbler, designed to remove the air from the water
as it flows through the system.

Follow the installation instructions included with the air removal device when placing it
in the system; air removal devices generally work better when placed higher in the
system. Always locate air removal devices in areas of the system that have a guaranteed
positive pressure, e.g., in close proximity to the water fill and expansion tank.

Trinity boilers are equipped with an automatic air removal device to aid in the purging of
air from the boiler during the initial fill. This device is NOT intended, nor is it sufficient
to remove the air from the system plumbing, even if the air makes it back to the boiler.

Expansion Tank – The expansion tank must be sized in accordance with the water volume of the system as well

as the firing rate of the boiler. It is important to locate the expansion tank, and make-up water fill, on the
inlet side of any circulator in the system, as doing so will guarantee the lowest pressure in the system will be
at least equal to the tank and make-up water pressure. See examples in Figures 10-2 and 10-3.

A strategically located air removal device must be installed in the system.

Ensure the expansion tank cannot become isolated from the boiler anytime the system is
operating. Failure to follow these instructions may result in discharge of the Pressure
Relief Valve may result in property damage or personal injury.

The installation of flow checks, motorized valves or other shutoff devices (other than for

the purpose of servicing) are not permitted between the location of the “Closely Spaced

Tees” and the expansion tank; see Figures 10-2 and 10-3.

48

Lx150

10’ at 6 GPM

Lx500

18’ at 20 GPM

Lx150E

14’ at 6 GPM

Lx600

18’ at 24 GPM

Lx200

14’ at 8 GPM

Lx700

15’ at 28 GPM

Lx300

12’ at 11 GPM

Lx800

12’ at 32 GPM

Lx400

9’ at 16 GPM

Trinity Lx │Installation and Operation Instructions Lx Series

Indirect Fired Water Heater – When installed as per Figure 10-3, the indirect fired water heater is in series

with the boiler during a demand for DHW. Therefore when using this configuration it is important to use an
Indirect Fired Water Heater that has minimal head loss. Indirect fired water heater head loss must not exceed
those specified in Table 10-5, when installed as per Figure 10-3.

Table 10-5 Maximum Indirect Fired Water Heater Head Loss (Boiler Side) at Minimum Flow

Figure 10-2: Single System Circulator Configuration - Often used in applications zoned with “Zone Valves”.

During a demand for central heat, the boiler energizes the System Circulator via the Central Heating (CH)
pump output (PUMP C). The System Circulator must be sized to provide adequate circulation throughout the
heating system. During a Domestic Hot Water (DHW) demand, the boiler de-energizes the System
Circulator (PUMP C) and energizes the DHW Circulator (Pump A). With this configuration the Boiler
Circulator is the only pump that causes flow through the boiler and it is powered during any demand via the
boiler pump output (PUMP B). This circulator must be sized according to Table 10-4.

Figure 10-3: Multiple System Circulator Configuration - Often used in applications with “Zone Circulators”.

This configuration requires the installation of a check valve located at each circulator. During a central
heating demand the boiler energizes the Central Heat Circulator via the Central Heat pump out (PUMP C).
During a Domestic Hot Water (DHW) demand, the boiler de-energizes PUMP C and energizes the DHW
Circulator (Pump A). Both Pump A and C, used in this configuration, are responsible for water flow through
the boiler and must be sized according to Table 10-4. Pump output, PUMP B is not used in this
configuration.

The piping configuration described above requires the Central Heating system and DHW
system to be de-coupled from the “Primary Loop” via closely spaced tees (Figure 10-3).

Figures 10-2 and 10-3 illustrate typical piping systems. These piping schematics do not
illustrate all of the required concepts and components required to have a proper
installation. Concepts not shown include: prevention of thermal-siphoning (heat traps),
isolation valves, drain and purge valves, etc. It is the responsibility of the installing
contractor and system designer to determine which system best meets the need of the
installation and to consider all aspects of a proper system design. Contractor
modifications to these instructions may be required, based upon existing piping and
system design.

49

Lx Series Installation and Operation Instructions │Trinity Lx

Figure 10-2 Primary / Secondary Plumbing

(Single System Circulator Configuration)

50

Trinity Lx │Installation and Operation Instructions Lx Series

Figure 10-3 Primary / Secondary Plumbing

(Multiple System Circulator Configuration)

51

# of

Units

Lx150/150E

Lx200

Lx300

Lx400

Lx500

Lx600

Lx700

Lx800

2

1-1/2"

2"

2”

2-1/2"

2-1/2”

3”

3”

3"

3

2"

2"

2-1/2”

3"

3”

3”

4”

4"

4

2"

2-1/2"

2-1/2”

3"

4”

4”

4”

4" 5 2-1/2"

2-1/2"

3”

4"

4”

4”

4”

5" 6 2-1/2"

3"

3”

4"

4”

4”

5”

5" 7 2-1/2"

3"

4”

4"

4”

5”

5”

5" 8 2-1/2"

3"

4”

4"

5”

5”

5”

5"

Lx Series Installation and Operation Instructions │Trinity Lx

11.0 LEAD LAG INSTRUCTIONS
Multiple Boiler Applications

The Lx controller has the internal capacity to stage or Lead-Lag up to 8 boilers configured in a cascade. This
Lead-Lag capability allows a designated “Master” boiler to communicate with and effectively control each
boiler in a multiple boiler system. This function is accomplished by “Daisy Chaining” a 3-wire cable between
each of the boilers and enabling the Master parameter in the boiler of your choice. The boiler with the Master
parameter enabled becomes the single point of contact for Central Heating, Domestic Hot Water and Outdoor
Reset settings and control. Use the instructions detailed in this section to set-up and install the cascade boiler
system; reference Appendix A – Controller and Touchscreen Display Instructions for details on more advanced
settings and for assistance with navigating the touchscreen display.

Lead Lag Instructions - Common

Plumbing – install as many as 8 Lx boilers in parallel in a primary/secondary plumbing configuration as

illustrated in Figure 11-1. Size common piping as per Table 11-1.

Boiler Pump – each boiler must have its own circulator (see Figure 11-1) which is controlled by its PUMP B

output; see Field Wiring Figures and Tables 12-1(a) and 12-1(b). The Boiler Pump must be sized according
to Table 10-4.

Communication Wiring – using 3-wire cable, daisy-chain terminals LL DATA +, LL DATA – and SENSOR

COM of each boiler in parallel; see Field Wiring Tables 12-2(a) and 12-2(b) and Figure 12-2.

System Sensor (Optional) – install a system sensor (NTI P/N: 84010) on the outlet (supply) pipe feeding the

heating system, see Figure 11-1. Wire the system sensor to SENSOR COM and SYSTEM (OD / SYS SENSOR
for Lx500-800 models) of the Master Boiler; see Field Wiring Tables 12-2(a) and 12-2(b) and Figure 12-2.
The system sensor automatically becomes the modulation sensor for the boiler system, i.e. the control attempts
to achieve setpoint temperature at the location of the sensor. If a system sensor is NOT used, at the Master
boiler set the applicable sensor input to Unconfigured as follows:

Configure – Sensor Configuration – S10 (J10-7) sensor [S5 (J8-11) sensor for Lx500-800 models]
Outdoor Sensor (Optional) – wire the outdoor sensor to SENSOR COM and OD SENSOR (OD / SYS SENSOR

for Lx500-800 models) of any one of the boilers in the cascade (for Lx500-800 models, outdoor sensor must
be connected to a non-Master boiler); see Field Wiring Tables 12-2(a) and 12-2(b) and Figure 12-2. Note:
only one outdoor sensor is needed for the multiple boiler system.

Modbus Address – assign a unique MB2 Modbus Address to each boiler in the cascade. Access the MB2

Modbus Address setting via the System Identification & Access menu as follows:

Configure – System Identification & Access – MB2 Modbus Address

Master Enable – choose one (and only one) boiler in the cascade to be the Master, this boiler will receive all

control wiring and will be used for setting control parameters (see steps below). On this one boiler, set Master
enable equal to Enabled via the Lead Lag Master Configuration menu, accessed as follows:

Configure – Lead Lag Master Configuration – Master enable

Table 11-1 Minimum Pipe Sizes for Multiple Boiler Applications

52

Master

Boiler

Trinity Lx │Installation and Operation Instructions Lx Series

Multiple Boiler Lead-Lag Plumbing Configuration

Figure 11-1 All Models

53

Lx Series Installation and Operation Instructions │Trinity Lx

Lead Lag Instructions – Central Heating

Central Heat Demand Switch (Room Thermostat) – connect to R (24VAC) and CH2 (LL) of the Master Boiler;

see Field Wiring Tables 12-2(a) and 12-2(b) and Figure 12-2. Switch must be an isolated end switch (dry
contact).

Central Heat Setpoint – at the Master boiler only, set the CH setpoint via the Lead Lag Master Configuration

menu, accessed as follows:

Configure – Lead Lag Master Configuration – CH setpoint

Outdoor Reset Settings – at the Master boiler only, set the Outdoor reset parameters via the Lead Lag Master

Configuration menu, accessed as follows:

Configure – Lead Lag Master Configuration – Advanced Settings – Outdoor reset

CH Pump – one boiler in the cascade can be chosen to operate the Central Heating pump via its PUMP C output;

see Field Wiring Figures and Tables 12-1(a) and 12-1(b). From the respective boiler display, check the box
next to Use for Lead Lag Master demands for the CH Pump to ensure proper pump behavior. Menu access to
the CH Pump parameters is as follows:

Configure – Pump Configuration – Central Heat pump – Use for Lead Lag Master demands

Sensor Configuration (Lx500-800 models only) – at the Master boiler only, set the Outdoor temperature source

equal to Unconfigured, via the Sensor Configuration menu as follows:

Configure – Sensor Configuration – Outdoor temperature source

Lead Lag Instructions – Domestic Hot Water

Tank Thermostat – connect to SENSOR COM and DHW of the Master Boiler; see Field Wiring Tables 12-2(a)

and 12-2(b) and Figure 12-2. Switch must be an isolated end switch (dry contact).

DHW Setpoint – at the Master boiler only, set the DHW setpoint via the Lead Lag Master Configuration menu,

accessed as follows:

Configure – Lead Lag Master Configuration – DHW setpoint

DHW switch (Lead Lag) – at the Master boiler only, set DHW switch equal to DHW (S6) sensor shorted via the

Lead Lag Master Configuration menu, accessed as follows:

Configure – Lead Lag Master Configuration – Advanced Settings – Domestic Hot Water – DHW switch

DHW enable (Local) – at the Master boiler only, set DHW enable equal to Disabled via the Domestic Hot Water

Configuration menu, accessed as follows:

Configure – Domestic Hot Water Configuration – DHW enable

DHW Pump – one boiler in the cascade can be chosen to operate the DHW pump via its PUMP A output; see

Field Wiring Figures and Tables 12-1(a) and 12-1(b). From the respective boiler display, check the box next

to Use for Lead Lag Master demands for the DHW Pump to ensure proper pump behavior. Menu access to the
DHW Pump parameters is as follows:

Configure – Pump Configuration – DHW pump – Use for Lead Lag Master demands

Tank Sensor – when operating in a cascade system, the boiler controls do not support the
use of a tank sensor; a tank thermostat (switch) must be used.

54

Trinity Lx │Installation and Operation Instructions Lx Series

12.0 FIELD WIRING

All wiring must be in accordance with the Canadian Electrical code, CSA C22.2 and any applicable local codes.
Ensure that the wiring complies with this manual. The boiler must be electrically grounded in accordance with
the National Electrical Code ANSI/NFPA 70, local codes, and/or the Canadian Electrical Code CSA C22.1.

Avoid Shocks - To Avoid Electrical Shock, turn off electrical power to the boiler prior to
opening any electrical box within the unit. Ensure the power remains off while any
wiring connections are being made. Failure to follow these instructions may result in
component failure, serious injury or death.

Field Wiring - Wire grommets must be used to secure wiring and prevent chafing when
passing wiring through the cabinet wall. Failure to follow instructions may damage unit.

Line Voltage Connections

Electrical rating for the Trinity Lx is 120V / 1 Phase / 60 Hz / 12A. The Trinity Lx line voltage junction box is
located in the lower right corner of the boiler cabinet on models Lx150-200 and can be accessed by removing the
front door of the boiler, followed by the removal of the line voltage junction box cover. On Lx300-400 models,
the line voltage junction box is located at the top of the boiler cabinet on the right hand side and can be accessed
by removing the top front cover of the boiler. On Lx500-800 models, the line voltage junction box is located at
the back of the boiler cabinet on the power switch side. Remove the top back cover of the boiler to access the
three holes / knockouts needed for routing field wiring into the line voltage junction box. Line voltage field
connections are to be installed in accordance with Figures and Tables 12-1(a) and 12-1(b).

Fuses (120VAC) – The Trinity Lx is equipped with either one or two 7 Amp fuses to protect 120VAC system

components. The fast-acting fuses are located on the front of the control panel box and can be easily
accessed from the outside of the control panel.

Lx150-400 Control Panel:

 Fuse A: Protects the blower, spark generator and PUMP B output circuits.
 Fuse B: Protects PUMP A and PUMP C output circuits.

Lx500-800 Control Panel:

 Fuse A: Protects the 120VAC circuits within the boiler.

Pump Relays (Lx500-800) – In lieu of the 120VAC pump outputs, the Lx500-800 incorporates three non-

powered isolation relay contacts for switching high capacity pumps. Contact Secondary Maximum rating is

1.5HP @ 120V, 3.0HP @ 240V, or 30A. Refer to Figure 12-2(b) for Field Wiring requirements.

Wire Protection - When passing any wiring through the cabinet of the boiler, the
installer must use wire grommets suitable for securing the wiring and preventing chafing.
Failure to follow instructions may result in component failure, serious injury or death.

Power Supply - The Trinity Lx is designed to be powered using a single phase 120VAC
power supply that is fused (or protected via a circuit breaker) to allow a maximum of 15
Amps. Failure to follow instructions may result in component failure, serious injury or
death.

Labeling - Label all wires prior to disconnecting them when servicing controls. Wiring
errors can cause improper and dangerous operation. Failure to follow instructions may
result in property damage or personal injury.

Continuity - Before connecting the line voltage wiring, perform a continuity check
between all wires and ground to make sure that there are no electrical leaks that could
blow a fuse or damage electrical components. Also check the polarity of the line and
neutral wires. Line must measure 120VAC to ground; neutral must measure zero.
Failure to follow instructions may damage the unit.

Max Load – Lx150-400 circulator outputs are each limited to operating a circulator with
a maximum current load of 3 Amps or a maximum 1/6 hp motor. See Table 12-1.

55

Table 12-1(a) Line Voltage Field Connections (Lx150-400)

Connection

Location

Description

L1

(120VAC)

1

Location for connecting line voltage of the power supply. Note; most installation codes
require the installation of a service switch to break line voltage to the boiler.

PUMP A

2

120VAC output to the DHW circulator; powered during a demand for DHW.

PUMP B

3

120VAC output to the Boiler circulator; powered during all demands; DHW, local Central
Heat (CH1) and Lead-Lag Central Heat [CH2 (LL)]. This output is not used for all
plumbing configurations, see Section 10.0.

PUMP C

4

120VAC output to the Central Heating circulator; powered during a demand for local
Central Heat (CH1) or Lead-Lag Central Heat [CH2 (LL)].

L2

(Neutral)

5

Location for connecting neutral of the power supply and all circulators.

6

Ground

7

Location for connecting earth ground and for grounding all of the circulators.

8

No Conn.

9

This terminal is used only for factory wiring, do not add or remove wires from this
location.

LINE

NEUTRAL

GND

PUMP A

PUMP B

PUMP C

SERVICE SWITCH

(field supplied)

Green

Green

Green

Black

White

White

Black

White

Black

120VAC SUPPLY

Lx Series Installation and Operation Instructions │Trinity Lx

Figure 12-1(a) Line Voltage Field Wiring (Lx150-400)

56

Table 12-1(b) Line Voltage Field Connections (Lx500-800)

Connection

Location

Description

L1 (120VAC)

1

Location for connecting line voltage of the power supply. Note, most installation codes
require the installation of a service switch to break line voltage to the boiler.

L2

(Neutral)

2

Location for connecting neutral of the power supply.

Ground

3

Location for connecting earth ground.

Non-Powered

Dry Contacts

PUMP A

4

Dry Contacts for DHW circulator; Coil A powered during a demand for DHW, closing
Pump A relay contacts.

5

PUMP B

6

Dry Contacts for Boiler circulator; Coil B powered during all demands; DHW, local
Central Heat (CH1) and Lead-Lag Central Heat [CH2 (LL)], closing Pump B relay
contacts. This output is not used for all plumbing configurations, see Section 2.0.

7

PUMP C

8

Dry Contacts for Central Heating circulator; Coil C powered during a demand for local
Central Heat (CH1) or Lead-Lag Central Heat [CH2 (LL)], closing Pump C relay contacts.

9

Trinity Lx │Installation and Operation Instructions Lx Series

Figure 12-1(b) Line Voltage Wiring (Lx500-800)

57

Connection

Location

Description

COM
(24VAC)

1

24VAC Common – Neutral for the 24VAC power supply from the boiler. COM can be
used in conjunction with terminal R to provide a power source for a digital thermostat.

R
(24VAC)

2

24VAC Hot - Power supply for inputs LIM, CH1, and CH2 (LL).

3

LIM

4

External Limit – Input requiring 24VAC from terminal R to permit the burner to operate.
Comes factory equipped with a jumper to the R terminal. For installations requiring the
use of an additional safety switch, such as a LWCO, Flow Switch, or auxiliary temperature
limit, remove the factory installed jumper and install the normally open isolated contacts of
the additional limit in its place.

CH1

5

Local Central Heat Demand – Input requiring 24VAC from terminal R to initiate a
“local” CH call. Switch is made using an isolated end switch (dry contact) via thermostat,

zone controller or other device. Typically used as the lone heat input or as the high
temperature input in dual CH temperature systems.

CH2 (LL)

6

Lead-Lag Central Heat Demand – Input requiring 24VAC from terminal R to initiate a
“lead-lag” CH call. Switch is made using an isolated end switch (dry contact) via

thermostat, zone controller or other device. Typically used as a lead-lag input for cascaded
boilers or as the low temperature input in dual CH temperature systems.

Sensor

DHW

7

DHW Tank Demand – Input requiring closure of terminals 7 and 10 to initiate a demand

for DHW. Switch made via isolated end switch (dry contact) from a thermostat (Aquastat)
located in an Indirect Fired Water Heater. Or optional Tank Sensor (P/N 84632), see
Appendix A. (NOTICE: tank sensor cannot be used for cascade boiler arrangements).

OD
SENSOR

8

Outdoor Temperature Sensor – A wall mountable OD Sensor is included with each

boiler. When connected to terminals 8 and 10, the control will indicate the outdoor
temperature and adjust the boiler temperature set point during a Central Heat demand.

SYSTEM

9

System Water Temperature – An optional strap-on System Sensor is available from NTI

(P/N 84010). When connected to terminals 9 and 10, the control will indicate a “CH” or
“Lead-Lag” temperature. The control can be set to use the System Sensor as the

Modulation Sensor for a CH1 or Lead Lag demand; see Appendix A.

SENSOR
COM

10

System Common – Common port for field inputs DHW, OD Sensor, System Sensor and

Communication terminals.

4 -20mA

11

External Modulation Control – Using a 4-20mA signal, an external control can be used
to directly modulate the burner firing rate or adjust the active set point. This can be useful
for applications using external staging controls or Building Automation Systems.

12

Communications

LL DATA+

13

Lead-Lag – Connects internally to the controller’s MB2, Modbus communication port.

Terminals 13, 14 and 10 (common) can be "daisy-chained" to multiple boilers (up to 8 in
total) for the purpose of staging.

LL DATA–

14

BMS D+

15

Building Management System (BMS) – Connects internally to the display’s COM2,
Modbus communication port. Terminals 15, 16 and 10 (common) can be connected to a
Gateway for communication to a BMS or other device.

BMS D–

16

ALARM

17

Normally Open Alarm Contacts – Contacts close during a lockout or other alarm
condition. May be connected to a BMS, maximum capacity of 0.63Amps at 24VAC.

18

Lx Series Installation and Operation Instructions │Trinity Lx

Low Voltage Connections

The Trinity Lx low voltage junction box is located in the lower left corner of the boiler cabinet on Lx150-200
models and can be accessed by removing the front door of the boiler, followed by the removal of the low voltage
junction box cover. On Lx300-400 models, the low voltage junction box is located at the top of the boiler
cabinet on the left hand side and can be accessed by removing the top front cover of the boiler. On Lx500-800
models, the low voltage junction box is located at the back of the boiler cabinet and can be accessed by
removing the top back cover of the boiler. Each boiler is provided with one hole and two knockouts for routing
field wiring into the low voltage junction box. Low voltage field connections identified in Tables 12-2(a) and
12-2(b) are to be read in conjunction with Figure 12-2.

Table 12-2(a) Low Voltage Field Connections (Lx150-400)

58

Connection

Location

Description

COM (24VAC)

1

24VAC Common – Neutral for the 24VAC power supply from the boiler. COM can be
used in conjunction with terminal R to provide a power source for a digital thermostat.

R1/R2 (24VAC)

2

24VAC Hot - Power supply for inputs EXT. LIM, CH1, and CH2 (LL).

3

EXT. LIM

4

External Limit – Input requiring 24VAC from terminals R1/R2 to permit the burner to
operate. Comes factory equipped with a jumper to the R2 terminal. For installations
requiring the use of an additional safety switch, such as a LWCO or auxiliary temperature
limit, remove the factory installed jumper and install the normally open isolated contacts of
the field supplied additional limit in place of jumper.

GAS LO PR.

5

Gas Low Pressure Switch (Optional) – Comes factory equipped with a jumper. For
applications requiring a Low Gas Pressure Switch, remove jumper and connect normally
open isolated contacts of the Gas Low Pressure Switch. Switch must be installed external to
unit (24VAC circuit). For preapproved High Gas Pressure Switch, see Note 1 below.

6

AUX. PROOF

7

Auxiliary Proof – Comes factory equipped with a jumper. For applications using Indoor
Combustion Air, remove jumper and replace with field supplied end switch incorporated
with motorized damper/louver control.

8

CH1

9

Local Central Heat Demand – Input requiring 24VAC from terminal R to initiate a

“local” CH call. Switch is made using an isolated end switch (dry contact) via thermostat,

zone controller or other device. Typically used as the lone heat input or as the high
temperature input in dual CH temperature systems.

CH2 (LL)

10

Lead-Lag Central Heat Demand – Input requiring 24VAC from terminal R to initiate a
“lead-lag” CH call. Switch is made using an isolated end switch (dry contact) via

thermostat, zone controller or other device. Typically used as a lead-lag input for cascaded
boilers or as the low temperature input in dual CH temperature systems.

Sensor

DHW

11

DHW Tank Demand – Input requiring closure of terminals 11 and 14 to initiate a demand

for DHW. Switch made via isolated end switch (dry contact) from a thermostat (aquastat)
located in an Indirect Fired Water Heater. Or optional Tank Sensor (P/N 84632), see
Appendix A. (NOTICE: tank sensor cannot be used for cascade boiler arrangements).

OD / SYS
SENSOR

12

Outdoor Temperature Sensor – A wall mountable OD Sensor is included with each

boiler. When connected to terminals 12 and 14, the control will indicate the outdoor
temperature and adjust the boiler temperature set point during a Central Heat demand.

System Water Temperature – An optional strap-on System Sensor is available from NTI

(P/N 84010). When connected to terminals 12 and 14, the control will indicate a “Lead­Lag” temperature. By default, the System Sensor becomes the Modulation Sensor for a
Lead Lag demand.

NOTICE: only one sensor can be connected to terminal 12 (System OR Outdoor Sensor);
see instructions in Appendix A.

TOD

13

Time of Day (Night Time Setback) – Input requiring closure of terminals 13 and 14 to
initiate TOD setback setting. Switch is made using an isolated end switch (dry contact)
using a timer, BAS or other device. [TOD applicable to and available on Lx500-800 only]

SENSOR
COM

14

System Common – Common port for field inputs DHW, OD Sensor and System Sensor.

4 -20mA (– / +)

15

External Modulation Control – Using a 4-20mA signal, an external control can be used
to directly modulate the burner firing rate or adjust the active set point. This can be useful
for applications using external staging controls or Building Automation Systems.

16

Communications

LL DATA+

17

Lead-Lag – Connects internally to the controller’s MB2, Modbus communication port.

Terminals 17, 18 and 14 (common) can be "daisy-chained" to multiple boilers (up to 8 in
total) for the purpose of staging.

LL DATA–

18

BMS D+

19

Building Management System (BMS) – Connects internally to the display’s COM2,
Modbus communication port. Terminals 19, 20 and 14 (common) can be connected to a
Gateway for communication to a BMS or other device.

BMS D–

20

ALARM (A&B)

21

Normally Open Alarm Contacts – Contacts close during a lockout or other alarm
condition. May be connected to a BMS, maximum capacity of 0.63Amps at 24VAC.

22

Notes

1

For applications requiring a High Gas Pressure Switch, see supplemental instructions included with NTI High Gas

Pressure Switch Kit, P/N 84094. Note that this is the only High Gas Pressure Switch that has been tested with the unit
and preapproved for field installation within the boiler cabinet.

Trinity Lx │Installation and Operation Instructions Lx Series

Table 12-2(b) Low Voltage Field Connections (Lx500-800)

59

Lx Series Installation and Operation Instructions │Trinity Lx

Low Voltage Terminals - Terminals 2 and 3 (R) have 24VAC potential from the internal

transformer. Do not connect power from these terminals to any other terminal other than
terminals 4, 5 and 6 [LIM, CH1, and CH2 (LL)]. Failure to follow these instructions may
damage the unit.

Fuse (24VAC) - Trinity Lx150-400 models are equipped with a “blade style” 2 Amp
fuse to protect the internal transformer located within the slide-out control panel box.

Figure 12-2 Low Voltage Field Wiring (All Models)

Lx150-400 Illustrated

60

Figure 13-1(a) Connection Diagram (Lx150-400)

Trinity Lx │Installation and Operation Instructions Lx Series

13.0 WIRING SCHEMATICS

61

Figure 13-1(b) Ladder/Logic Diagram (Lx150-400)

Lx Series Installation and Operation Instructions │Trinity Lx

62

Figure 13-2(a) Connection Diagram (Lx500-800)

Trinity Lx │Installation and Operation Instructions Lx Series

63

Figure 13-2(b) Ladder/Logic Diagram (Lx500-800)

Lx Series Installation and Operation Instructions │Trinity Lx

64

Trinity Lx │Installation and Operation Instructions Lx Series

14.0 INSTALLATION CHECKLIST
Installation

 1. If operating on Propane Gas, convert boiler using appropriate Kit number. See Table 7-1.
 2. Locate the boiler in accordance with Section 3.0 of this manual.
 3. Install the Vent/Air-inlet piping in accordance with Sections 4.0 and 5.0 of this manual. Ensure all joints

are secured and cemented properly. Perform the Mandatory Pre-commissioning Procedure for Plastic
Venting in Section 4.0.

 4. Connect the condensate drain in accordance with Section 6.0 of this manual.
 5. Connect the gas supply in accordance with Section 7.0 of this manual.

 6. Install the plumbing in accordance with the appropriate this Manual. Flush/cleanse the internals of the

heating system. Treat system water with Fernox F1 Protector. See Table 10-1.

 7. Connect field wiring in accordance with Section 12.0 of this manual.
 8. Advise home/building owner of their responsibilities with respect to maintaining the boiler.

The building owner is responsible for keeping the Vent/Air-inlet termination free of snow,
ice, or other potential blockages and for scheduling routine maintenance on the boiler (see
Section 15.0). Failure to properly maintain the boiler may result in serious injury or death.

Start-up

Allow primers/cements to cure for 8 hours prior to Start-up. If curing time is less than 8
hours, first perform Steps 2 through 6 of Mandatory Pre-commissioning Procedure for
Plastic Venting in Section 4.0. Failure to follow these instructions can result in explosion,

 1. Turn gas shut-off valve to the ON position.
 2. Turn Power on to boiler.
 3. Set Controller to the desired settings.
 4. Turn thermostat up, Ignition will occur.

Operational Checklist

 1. System is free of gas leaks.
 2. System is free of water leaks.
 3. Water pressure is maintained above 15 PSI.
 4. All air is purged from the heating system piping.
 5. Ensure proper water flow rate; unit must not kettle, bang, hiss or flash the water to steam.
 6. Ensure gas line pressure is in accordance with Section 9.0.
 7. System is free of combustion leaks.
 8. Unit must operate smoothly.
 9. Ensure the flue gas combustion readings are within the tolerances listed in Table 9-1.
 10. Each ignition must be smooth.
 11. Verify that all condensate lines are clean and drain freely.

Before Leaving

 1. Remove line pressure gauge from gas valve, tighten bleed screw, test screw for leaks. See Section 9.0.
 2. Install plug into the flue gas test port and test for leaks, see Section 9.0.
 3. Allow the boiler to complete at least one heating cycle, or to operate for at least 15 minutes.
 4. Always verify proper operation after servicing.

Instructions to Installing Contractor

 1. Ensure that the customer receives the Warranty Documentation included with the installation manual.
 2. Leave the manual with the customer so they know when to call for annual maintenance and inspection.

serious injury or death.

This boiler must have water flowing through it whenever the burner is firing. Failure to
comply may damage the unit, void the warranty, and cause serious injury or death.

Allowing the boiler to operate with a dirty combustion chamber will adversely affect its
operation and void the warranty. Failure to clean the heat exchanger on a frequency that
matches the need of the application may result in fire, property damage, or death.

65

Lx Series Installation and Operation Instructions │Trinity Lx

15.0 ANNUAL MAINTENANCE AND INSPECTION

This unit must be inspected at the beginning of every heating season by a Qualified Technician.

Annual Inspection Checklist

 1. Lighting is smooth and consistent, and the combustion fan is noise & vibration free.
 2. The condensate freely flows from the unit, and is cleaned of sediment.
 3. Relief Valve and air vents are not weeping.
 4. Low water cut off is flushed (if applicable)
 5. Examine all venting for evidence of leaks. Ensure vent screens are cleaned and clear of debris.
 6. Check the burner plate for signs of leaking.
 7. The combustion chamber must be inspected and cleaned.
 8. Listen for water flow noises indicating a drop in boiler water flow rate.

The hydronic system may need to be flushed to eliminate hard water scale
(Use Fernox DS-40 Descaler, NTI PN: 83450; see Table 10-1).

Combustion Chamber Cleaning Procedure

Units operating with LP Gas or in an industrial environment will have to be cleaned a minimum of once per year.
Other applications will require the combustion chamber to be cleaned after the first year of operation, with
subsequent cleanings scheduled based on the condition of the combustion chamber at the time. Unless a step is
identified as model specific, the following combustion chamber cleaning procedure is the same for all models.

Crystalline Silica - Read carefully the warnings and handling instructions pertaining to
Refractory Ceramic Fibers before commencing any service work in the combustion
chamber. Take all necessary precautions and use recommended personal protective

Cleaning Checklist

 1. Initiate a post-purge cycle to clear any gas from the combustion chamber, then turn gas valve off.
 2. Danger Explosion Hazard (Lx300-800): To disconnect the fuel-air metallic tubing between the blower

and the high-vent pressure switch, loosen the compression fitting at the high-vent pressure switch with a
1/2" wrench. At the blower end, support the brass fitting body with a 1/2" wrench to keep it from rotating
while loosening the compression fitting nut with a 9/16" wrench. Remove tubing assembly from blower.

 3. Access the combustion chamber by removing the aluminum burner door assembly of the boiler.
 4. Remove (or cover) the insulation disc located in the back of the combustion chamber to avoid damaging

it during the cleaning process. The disc is held in place with a 2.5mm "Allen-head" screw.

 5. Use a vacuum with a high efficiency filter to remove any loose debris or dust.
 6. Wet the inside of the combustion chamber with water. Use a garden hose with a trigger nozzle to direct

pressurized water through the gaps between the heat exchanger tubes. The water should pass in-between
the heat exchanger tubes and exit via the condensate drain. This process may require the use of some dry
rags or plastic to protect electrical components from being damaged by dripping or spraying water.

 7. Use a nylon or other non-metallic brush to loosen the incrustations and any other contaminates that have

remained stuck on and in-between the tubes.

 8. Repeat steps 6 and 7 until the heat exchanger is clean and water from the condensate drain runs clear.
 9. Re-install the insulation disc to the back of the combustion chamber (see Table 16-1, Item 31 for part #).
 10. Inspect the insulation disc located on the back-side of the burner door. Replace if damaged (see Table 16-

1, Item 33 for part # by applicable model).

 11. Re-install the burner door, gas-supply and Air-inlet pipe, check for gas leaks.
 12. Lx300-800: Reconnect the fuel-air metallic tubing between the blower and the high-vent pressure switch.

Ensure the brass fitting body at the blower remains stationary and does not rotate during reconnection.

 13. Perform the Operational Check List detailed in Section 14.0.

Chamber Cleaning Procedure for instructions on connecting and disconnecting the metallic tubing. Failure to
follow these instructions will result in serious injury or death.

equipment as required.

Explosion Hazard (Lx300-800) - The fuel-air metallic tubing connecting the blower and
the high-vent pressure switch contains a mixture of fuel and air. Refer to Combustion

Replace any gaskets or insulation discs that show any signs of damage and do not re-use.
Failure to follow these instructions may result in fire, property damage or death.

66

Reduce the Risk of Exposure

Precautions and Recommended Personal Protective Equipment

Avoid contact with skin and eyes

 Wear long-sleeved clothing, gloves, and safety goggles or glasses.

Avoid breathing in silica dust

 Wear a respirator with a N95-rated filter efficiency or better. 1
 Use water to reduce airborne dust levels when cleaning the combustion chamber.
 Do not dry sweep silica dust. Pre-wet or use a vacuum with a high efficiency filter.

Avoid transferring contamination

 When installing or removing RFCs, place the material in a sealable plastic bag.
 Remove contaminated clothing after use. Store in sealable container until cleaned.
 Wash contaminated clothing separately from other laundry.

First Aid Measures

If irritation persists after implementing first aid measures consult a physician.

 Skin - Wash with soap and water.
 Eyes - Do not rub eyes; flush with water immediately.
 Inhalation – Breathe in fresh air; drink water, sneeze or cough to clear irritated

passage ways.

Notes:

1

Respirator recommendations based on CCOHS and OSHA requirements at the time this document was written. Consult

your local regulatory authority regarding current requirements for respirators, personal protective equipment, handling,
and disposal of RCFs.

For more information on Refractory Ceramic Fibers, the risks, recommended handling procedures and
acceptable disposal practices contact the organization(s) listed below:

Canada (CCOHS): Telephone directory listing
under Government Blue Pages Canada—Health and
Safety—Canadian Centre for Occupational Health
and Safety; or website http://www.ccohs.ca.

United States (OSHA): Telephone directory listing
under United States Government—Department of
Labor—Occupational Safety and Health
Administration; or website http://www.osha.gov.

Trinity Lx │Installation and Operation Instructions Lx Series

Refractory Ceramic Fibers (RFC)

chamber. The insulating material on the inside of the burner door and at the back of the combustion chamber
contains Refractory Ceramic Fibers and should not be handled without personal protective equipment.

(cristobalite), a respirable silica dust. Repeated airborne exposure to crystalline silica dust may result in chronic
lung infections, acute respiratory illness, or death. Crystalline silica is listed as a (potential) occupational
carcinogen by the following regulatory organizations: International Agency for Research on Cancer (IARC),
Canadian Centre for Occupational Health and Safety (CCOHS), Occupational Safety and Health Administration
(OSHA), and National Institute for Occupational Safety and Health (NIOSH). Failure to comply with handling
instructions in Table 15-1 may result in serious injury or death.

maintenance can cause property damage, serious injury (exposure to hazardous materials) or death. Refer to
Table 15-1 for handling instruction 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 boiler. This boiler contains materials that have
been identified as carcinogenic, or possibly carcinogenic, to humans).

Table 15-1 Handling Instructions for Refractory Ceramic Fibers (RCF)

Personal Protective Equipment Recommended - Read the following warnings and

handling instructions carefully before commencing any service work in the combustion

Potential Carcinogen - Use of Refractory Ceramic Fibers in high temperature
applications (above 1000oC) can result in the formation of Crystalline Silica

Crystalline Silica - Certain components confined in the combustion chamber may
contain this potential carcinogen. Improper installation, adjustment, alteration, service or

67

Figure 16-1 Cabinet, Vent and Air-inlet Parts (Lx150-200)

44

41

43

45

40

38

39

50

49

48

46

47

72

73

75

66

53

55

64

37

Lx Series Installation and Operation Instructions │Trinity Lx

16.0 PARTS LIST

For a list of parts that corresponds to the item numbers in the bubbles, refer to Table 16-1. Note that that some
item numbers may appear more than once in the parts list depending on which model number is being referenced.

Building Owners - Replacement parts are available from your stocking wholesaler. Contact your local Installer
or Wholesaler for assistance with parts.

Wholesalers - Contact NY Thermal Inc. directly when ordering replacement parts, 1-506-657-6000.
Installers - Contact NY Thermal Inc. directly if technical assistance required, 1-800-688-2575.

Residential Models (Lx150-400)

68

Figure 16-2 Heat Exchanger, Gas Valve, Blower and Burner Assembly (Lx150-200)

Figure 16-3 Electrical Housing, Controller, and Display Module (Lx150-400)

56

58

57

52

70

59

62

71

61

63

69

58

60

67

81

68

51

54

65

58

10

11

5 6 7 8 20

19

18

17 9 15

4

14

16 3 29

36

11

34

32

33

31

28

30

27

23

25

21

26

1 2 22

24

13

105

12

Trinity Lx │Installation and Operation Instructions Lx Series

69

Figure 16-4 Cabinet, Vent and Air-Intake Parts (Lx300-400)

44

42

39

50

49

46

47

72

73

75

48

37

76

78

77

45

41

Lx Series Installation and Operation Instructions │Trinity Lx

70

Figure 16-5 Heat Exchanger, Gas Valve, Blower and Burner Assembly (Lx300-400)

10 2 36

3

5

6

11

34

33

31

28

24

25

19

18

17

15

4

35

13

13

14

4

1

20

26

32

30

29

79

8

7

9

105

Reverse

Angle View

16

114

106

Trinity Lx │Installation and Operation Instructions Lx Series

71

Figure 16-6 Cabinet, Vent and Air-inlet Parts (Lx500-800)

76

77

73

72

95

95

95

95

78

101

101

42

98

49

48

96

96

47

46

47

74

100

99

104

75

104

97

41

41

Lx700-800

(Elbow)

Lx500-600

(c/w Tabs)

44

Lx500-600

Flue Adapter

41

Lx Series Installation and Operation Instructions │Trinity Lx

Commercial Models (Lx500-800)

72

Figure 16-7 Heat Exchanger, Gas Valve, Blower and Burner Assembly (Lx500)

5

36

11

10

11

32

34

31

33

14

87

89

86

88

20

19

25

15

24

26

93

29

28

4

2

1

80

Reverse

Angle View

3

114

115

18

92

91

106

30

9

Trinity Lx │Installation and Operation Instructions Lx Series

73

Figure 16-8 Heat Exchanger, Gas Valve, Blower and Burner Assembly (Lx600-800)

80

1

6 2 4 5 7

9

36

11

10

11

32

34

31

33

14

14

89

90

86

89

20

19

25

15

24

30

85

26

93

13

13

92

91

83

29

14

18

84

87

3

88

94

86

82

94

86

90

89

9

14

13

14

13

87

89

89

Lx700-800

Gas Train

Lx600

Gas Train

28

Reverse

Angle View

44

106

89

114

Lx Series Installation and Operation Instructions │Trinity Lx

74

Figure 16-9 Electrical Housing, Controller, and Display Module (Lx500-800)

Item

Part #

Models

Description

1

82657

150

Premix burner 135.8 (Lx100-150; not Lx150E)

1

82658

150E, 200

Premix burner, 200.6 (Lx150E, Lx200)

1

84207

300

Premix burner, (Lx300)

1

83338

400, 500

Premix burner (Lx400-500)

1

84383

600

Premix burner (Lx600)

1

84134

700, 800

Premix burner (Lx700-800)

2

82761

150–500

Premix Burner Gasket (Lx150-500)

2

84133

600–800

Premix Burner Gasket (Lx600-800)

3

82771

150, 150E, 200

Extended Air Tube (Lx100-200)

3

83195

300–500

Extended Air Tube (Lx300-500)

3

84132

600, 700, 800

Conical Air-Gas Inlet Pipe / Stabilor (Lx600-800)

4

82766

150–500

Blower Gasket (Lx150-500)

4

84026

600–800

Blower Gasket (Lx600-800)

5

82052

150

EBM Blower RG130 (Lx100-150, not Lx150E)

5

82661

150E, 200, 300

EBM Blower RG148/1200-3633 (Lx150E-300)

5

82994

400

EBM Blower RG148/Enhanced (Lx400)

5

84322

500

EBM Blower NRG137 (Lx500)

5

84006

600–800

EBM Blower G1G170 (Lx600-800)

6

82054-2

150, 150E, 200, 300

CVI Venturi Gasket (Lx150-300)

6

83106

400

O-ring, Venturi to Blower (Lx400)

6

84084

600–800

O-ring, Venturi to Blower (Lx600-800)

7

82054-1

150, 150E, 200

CVI Venturi 01 (Lx150-200)

51

52

57

56

81

71

70

68

69

60

61

59

62

63

58

65

54

103

58

102

102

102

70

58

58

58

Trinity Lx │Installation and Operation Instructions Lx Series

Table 16-1 Parts List: Trinity Lx

75

Item

Part #

Models

Description

7

81994

300

CVI Venturi 51 (Lx300)

7

82990

400

CVI Venturi (Lx400)

7

84013

600–800

CVI Venturi (Lx600-800)

8

82650

150, 150E, 200

CVI 5.20mm Orifice #45.900.444.107B (Lx150-200)

8

84157

300

CVI 6.20mm Orifice (Lx300)

8

82993

400 (NG)

Gas Valve Orifice, 8.0mm, NG (Lx400)

8

83017

400 (LP)

Gas Valve Orifice, 6.2mm, LP (Lx400)

9

82054

150–300

Gas Valve (CVI) VK8115F1134B (Valve Only) (Lx150-300)

9

82989

400

Gas Valve VR8615VB 1044B (Lx400)

9

84318

500

Gas Valve GB-ND 057 (Lx500)

9

84012

600–800

Gas Valve V8730C 1023B (Lx600-800)

10

83870

150–500

Ignition Electrode, Dual – c/w gasket (Lx150-500)

10

84154

600–800

Ignition Electrode, Dual (Lx600-800)

11

82774

All Models

Flame Probe Gasket (Lx Series)

12

82600

150, 150E, 200, 300

Gas Valve Regulator Vent Adapter (Lx150-300)

13

83883

150, 150E, 200, 300

CVI Gas Valve Inlet O-ring Gasket (Lx150-300)

13

83194

400

Gas Valve Connector O-ring, Large (Lx400)

13

84138

600–800

Gas Valve Inlet O-ring (Lx600-800)

14

82065

150, 150E, 200, 300

Gas Valve (CV1) 1/2" NPT elbow #45.900.400-132B (Lx150-300)

14

82991

400

Gas Valve Adapter 45900400-138B, 3/4" NPT (Lx400)

14

84321

500

Gas Valve Adapter 253-517, 3/4” NPT, c/w screws and O-ring (Lx500)

14

84035

600–800

Gas Valve Adapter, 1" NPT (Lx600-800)

15

83606

All Models

Outlet Sensor, Dual (Lx Series)

16

83223-1

150, 150E, 200, 300, 400

Low Water Pressure Switch, 1/4" NPT (Lx150-400)

17

83462

150, 150E, 200

Street Tee, Brass, 1/4" (Lx150-200)

17

82698

300, 400

1/4" NPT Brass Tee (Lx300-400)

18

83007

All Models

1/4"x 1/8" Bushing Brass (Lx Series)

19

82539

All Models

Automatic Air Vent 1/8" (Lx Series)

20

83608

150, 150E, 200, 300, 400

Flue Sensor, Dual (Lx150-400)

20

84039

500–800

Flue Sensor, Dual (Lx Commercial)

21

82765

150, 150E, 200

Composite Flue Outlet Gasket (Lx150-200)

22

82763

150, 150E, 200

Composite Flue Box (Lx150-200)

23

82764

150, 150E, 200

Trinity Flue Box to Heat Exchanger Gasket (Lx150-200)

24

83605

All Models

Inlet Sensor, Single (Lx Series)

25

83706

150, 150E, 200, 300, 400

Plug, Brass, 1/4" NPT (Lx150-400)

25

84075

500–800

Plug, Brass, 1/2" NPT (Lx Commercial)

26

83395

150 (CAN)

Heat Exchanger (CAN - Lx100-150, not Lx150E) – Canada Only

26

83012

150 (US)

Heat Exchanger-ASME (US - Lx100-150, not Lx150E) – US Only

26

83396

150E, 200

Heat Exchanger-ASME (Lx150E-200)

26

84022

300

Heat Exchanger-ASME (Lx300)

26

82926

400

Heat Exchanger-ASME (Lx400)

26

84311

500

Heat Exchanger-ASME (Lx500)

26

84312

600

Heat Exchanger-ASME (Lx600)

26

84005

700, 800

Heat Exchanger-ASME (Lx700-800)

27

83042

150, 150E, 200

Y-Drain Fitting 5/8", White (Lx150-200)

28

83721

All Models

Tee, PVC, 1/2", Sch.40, White (Lx Series)

29

83720

All Models

Elbow, Street, PVC, 1/2", Sch.40, White (Lx Series)

30

83715

150, 150E, 200

Condensate Drain Tube (Lx150-200)

30

83907

300, 400

Condensate Drain Tube (Lx300-400)

30

84313

500, 600

Condensate Drain Tube (Lx500-600)

Lx Series Installation and Operation Instructions │Trinity Lx

76

Item

Part #

Models

Description

30

83996

700, 800

Condensate Drain Tube (Lx700-800)

31

83112

All Models

Trinity Divider Plate Insulation c/w Washer & Screw (Lx Series)

32

82770

150–500

Burner Door Viton Gasket (Lx150-500)

32

84136

600–800

Burner Door Viton Gasket (Lx600-800)

33

83808

150, 150E, 200, 500

Burner Door Ceramic Disc (Lx150-200,500)

33

83950

300, 400

Burner Door Ceramic Disc (Lx300-400)

33

84137

600–800

Burner Door Ceramic Disc (Lx600-800)

34

83885

150, 150E, 200, 500

Cast Alum Burner Door (Lx150-200,500)

34

83949

300, 400

Cast Alum Burner Door (Lx300-400)

34

84135

600–800

Cast Alum Burner Door (Lx600-800)

35

83934

300, 400

Nipple, 1/4" x 6", Brass 113-B6 (Lx300-400)

36

82762

150–500

Flame Rod (Lx150-500)

36

84155

600–800

Flame Rod (Lx600-800)

37

82099

150, 150E, 200, 300

1-1/2" MJ Coupling (Lx150-300)

37

83951

400

2" Gear Clamp Assembly (Lx400)

38

83425

150, 150E, 200

Elbow, Street 90, PVC Sys 15,1-1/2" (Lx150-200)

39

83426-1

150 (US)

1-1/2" PVC Pipe, Sys 15, 1.75" Long (Lx150 US)

39

83426-2

150E, 200

1-1/2" PVC Pipe, Sys 15, 4.5" Long (Lx150E-200)

39(a)

84208

300

1-1/2" Air Metering Assembly (Lx300)

39(b)

84209

300

2” PVC Air Inlet Assembly (Lx300)

39

83952

400

Air Inlet Assembly (Lx400)

40

83425-1

150, 150E, 200

Air Metering Elbow (Lx150-200)

41

83712

150, 150E, 200

Flue Outlet Adapter (Trinity Lx 3” PVC), c/w plug (Lx150-200)

41

83213

300, 400

Flue Outlet Adapter (Lx300-600)

41

84387

500, 600

Flue Outlet Adapter c/w Tabs (Lx500-600)

41

84052

700, 800

Flue Outlet Adapter (Lx700-800)

42

82882

300, 400

Coupling, Rubber , 4", Fernco (Lx300-400)

42

84051

500–800

Air Inlet Adapter SS (Lx Commercial)

43

83477

150, 150E, 200

Bushing, PVC Sch. 40, 3"x1.5" (Lx150-200)

44

83712-1

150, 150E, 200

3/8" Stainless Steel Plug (Lx150-200)

44

84054

300–800

Exhaust Test Plug (Lx300-800)

45

83873

150, 150E, 200

TiS Wall Mount Bracket 2 (Lx150-200)

45

83953

300, 400

Wall Mounting Clip (Lx300-400)

46

83505

150, 150E, 200, 300

Grommet, Vinyl, 1/2" IPS (Lx150-300)

46

83923

400

Grommet, Vinyl, 3/4" IPS (Lx400)

46

83506

600–800

Grommet, Vinyl, 1" IPS (1030) (Lx600-800)

47

83506

150, 150E, 200

Grommet, Vinyl, 1-3/8" OD

47

83924

300, 400

Grommet, Vinyl, 2" OD (Lx300-400)

47

84097

500–800

Grommet, Vinyl, 2 1/2" IPS (3125) (Lx Commercial)

48

83874

150, 150E, 200

TiS Air Switch Support Clip II (Lx150-200)

48

83954

300, 400

Air Switch Bracket (Lx300-400)

48

84139

600–800

Air Switch Bracket (Lx600-800)

49

82662

All Models

Air Switch Huba 604.E021180 set @ .15" w.c. (Lx Series)

50

83875

150, 150E, 200

TiS Wall Stand-Off - Bottom (Lx150-200)

50

83955

300, 400

Wall Mounting Support, Bottom (Lx300-400)

51

83508

All Models (pre 6/1/12)

Display Molding (Models manufactured before June 1, 2012)

51

84622

All Models (post 6/1/12)

Display Molding (Models manufactured after June 1, 2012)

52

83592

200 (pre 6/1/12)

Display S7999C, White (Lx200 manufactured before June 1, 2012)

52

83592-Lx

150, 300-800 (pre 6/1/12)

Display Upgrade kit (Models manufactured before June 1, 2012)

52

84653

All Models (post 6/1/12)

Display S7999D, Black (Models manufactured after June 1, 2012)

Trinity Lx │Installation and Operation Instructions Lx Series

77

Item

Part #

Models

Description

53

83876

150, 150E, 200

Electrical J-box Cover R1, Left (Lx100-200)

54

83872

All Models

Barrier Strip, Line Voltage (Lx Series)

55

83877

150, 150E, 200

Electrical J-box, Line Voltage (Lx150-200)

56

83707

All Models

Ignition Coil Q652B1006/B (Lx Series)

57

83724

All Models

Spark Igniter Wire, 12" (Lx Series)

58

82250

All Models

SNAP BUSHING, 1" (Lx Series)

59

83592-1

All Models

Power Supply – Touch Screen (Lx Series)

60

83190

150, 150E, 200, 300, 400

Transformer, 24V, 40VA (Lx150-400)

60

84047

500–800

Transformer, 24V, 75VA (Lx Commercial)

61

83589

150, 150E, 200, 300, 400

ICP Honeywell Sola Controller R7910B1015/B (Lx150-400)

61

84034

500–800

ICP Honeywell Sola Controller R7910A1001 (Lx Commercial)

62

83878

150, 150E, 200, 300, 400

Drawer Cover (Lx150-400)

62

84140

500–800

Control Panel Cover (Lx Commercial)

63

83879

150, 150E, 200, 300, 400

Drawer (Lx150-400)

63

84141

500–800

Control Panel (Lx Commercial)

64

83880

150, 150E, 200

Electrical J-box, Low Voltage (Lx150-200)

65

83871

150, 150E, 200, 300, 400

Barrier Strip, Low Voltage (Lx150-400)

65

84065

500–800

Barrier Strip, Low Voltage (Lx Commercial)

66

83876-1

150, 150E, 200

Lx150-200 Electrical J-box Cover R1 (Right) (Lx150-200)

67

83517

150, 150E, 200, 300, 400

Fuse, Matrix/Lx, 2 Amp (Lx150-400)

68

84192

All Models

Fuse Holder, 20 Amp at 250VAC Max (Lx Series)

69

83837

All Models

Fuse, Littlefuse 7A, 250VAC, Fast Blow (Lx Series)

70

83882

All Models

Touch Screen Display Support (Lx Series)

71

81027-1

All Models

Outdoor Sensor, 10K (Lx Series)

72

83886

150, 150E, 200

Front Cover (Lx150-200)

72

83956

300, 400

Front Cover (Lx300-400)

72

84372

500

Front Cover (Lx500)

72

84142

600–800

Front Cover (Lx600-800)

73

83887

150, 150E, 200

Right Side (Lx150-200)

73

84210

300

Right Side (Lx300)

73

83957

400

Right Side R1 (Lx400)

73

84373

500

Right Side (Lx500)

73

84374

600

Right Side (Lx600)

73

84143

700, 800

Right Side (Lx800)

74

83888

150 (CAN)

Left Side (Lx150 CAN)

74

83888-1

150 (US)

Left Side (Lx150 US, not 150E)

74

83888-2

150E, 200

Left Side (Lx150E-200)

74

84211

300

Left Side (Lx300)

74

83958

400

Left Side (Lx400)

74

84375

500

Left Side (Lx500)

74

84376

600

Left Side (Lx600)

74

84144

700, 800

Left Side (Lx700-800)

75

83889

150, 150E, 200

Front Top (Lx150-200)

75

84212

300

Front Top (Lx300)

75

82959

400

Front Top (Lx400)

75

84377

500

Top (Lx500)

75

84378

600

Top (Lx600)

75

84145

700, 800

Front Top (Lx700-800)

76

83890

150, 150E, 200

Top Panel Back R1 (Lx150-200)

76

83960

300, 400

Rear Top (Lx300-400)

Lx Series Installation and Operation Instructions │Trinity Lx

78

Item

Part #

Models

Description

76

84146

700, 800

Rear Top (Lx700-800)

77

83961

300, 400

Fuel-Air Metallic Tubing with Ends (Lx400)

77

84379

500

Fuel-Air Metallic Tubing with Ends (Lx500)

77

84147

600–800

Fuel-Air Metallic Tubing with Ends (Lx600-800)

78

83915

300, 400

High-Vent Pressure Switch, AFS460-367 (Lx300-400)

78

84380

500

High -Vent Pressure Switch, ANA124-406 (Lx500)

78

84053

600–800

High -Vent Pressure Switch, ANA124-381 (Lx600-800)

79

83962

400

Gas Valve Orifice O-ring, Large (Lx400)

80

84057

500–800

Coupling, 2”, Brass (Lx Commercial)

81

84010

All Models

System Sensor, Pipe Sensor TSA00A4 (Lx Series)

82

84087

600–800

Gasket, Cork (Lx600-800)

83

84045

600–800

Cross, Brass, M5 Thread To Barb (Lx600-800)

84

84148

600–800

Air Metering Tube (Lx600-800)

85

84044

600–800

Elbow, Brass, M5 to Barb (Lx600-800)

86

84388

500

Nipple, 3/4" x 5", Black Iron (Lx500)

86

84061

700, 800

Nipple, 1" x 6", Black Iron (Lx700-800)

87

84389

500

Elbow, 3/4", 90 deg., Street, Black Iron (Lx500)

87

84063

600–800

Elbow, 1", 90 deg., Street, Black Iron (Lx600-800)

88

84347

500

Manual Shutoff Valve, 3/4" NPT (Lx500)

88

84025

600–800

Manual Shutoff Valve, 1" NPT (Lx600-800)

89

84390

500

Nipple, 3/4" x 2-1/2", Black Iron (Lx500)

89

84351

600

Nipple, 1" x Close, Black Iron (Lx600)

89

84062

700, 800

Nipple, 1" x 3-1/2", Black Iron (Lx700-800)

90

84064

700, 800

Elbow, 1", 90 deg., Black Iron (Lx700-800)

91

84102

500–800

Flow switch, FS8-W, Paddles – 2-1/2” (Lx Commercial)

92

84099

500–800

Bushing, 2" x 1", Brass (Lx Commercial)

93

84058

500–800

Tee, 2" x 2" x 2", Brass (Lx Commercial)

94

84381

600

Gas Valve Regulator Sensing Tube (Lx600)

94

84149

700, 800

Gas Valve Regulator Sensing Tube (Lx700-800)

95

84095

500–800

Plug, 7/8" Black Dome (Lx Commercial)

96

84069

600–800

Clamp, U-bolt, 1" IPS (Lx600-800)

97

84072

500–800

Leg Leveler, 3/8-16 x 1/5" (Lx Commercial)

98

84073

500–800

Leg Leveler Hex Base Cap (Lx Commercial)

99

84150

500–800

Flow Switch Wiring Conduit (Lx Commercial)

100

83923

500–800

Grommet, Vinyl, 3/4" IPS (1020) (Lx Commercial)

101

84346

500

Grommet, Vinyl (3375), Air-inlet (Lx500)

101

84011

600–800

Gasket, Air-inlet 3/16" (Lx600-800)

102

84056

500–800

Relay, Omron (Lx Commercial)

103

84043

500–800

Rocker Switch, Black (Lx Commercial)

104

84130

500–800

Flow Switch Wiring Conduit Fitting (Lx Commercial)

105

82064

150-300

Gas Valve Harness, CVI (Lx150-300)

105

83016

400

Gas Valve Harness (Lx400)

105

84319

500

Gas Valve Harness, Dungs (Lx500)

106

84392

300–800

Thermal Fuse, Heat Exchanger Exterior (Lx300-800)

114

84993

300-800

M5 Reset Safety Switch (Lx300-800)

Trinity Lx │Installation and Operation Instructions Lx Series

79

Lx Series Installation and Operation Instructions │Trinity Lx

17.0 TROUBLESHOOTING

Servicing the Boiler

 Disconnect or shut off all energy sources to the boiler: 120VAC power, water and gas.
 Identify and mark wires before disconnecting or removing them.
 Never bypass electrical fuses or limit devices except temporarily for testing.
 Use proper personal protective equipment (PPE) i.e. eye protection, safety footwear.

These procedures should only be performed by qualified service personnel, when abnormal operation of the
boiler is suspected. The boiler incorporates a sophisticated microprocessor based control which normally
responds appropriately to varying conditions. If the boiler operation appears to be incorrect, or it is not
responding at all to a demand for heat, the following is suggested to determine and correct the problem.

Check 120VAC and 24VAC at the Boiler

First, verify the following:

 There is 120V being supplied to the boiler:

o The circuit breaker in the electrical panel supplying power to the boiler is not tripped.
o The service switch (if applicable) is in the ON position.

 There is a heat call from the thermostat:

o Verify 24VAC to thermostat.
o The thermostat is placed at a sufficiently high setting to create a call for heat to the boiler.

To check for the presence of 120VAC and 24VAC at the boiler follow this procedure:

 Remove the boiler front cover.
 120VAC

o Remove the Line Voltage junction box cover. First remove the #10 pan-head Phillips screw securing the

cover to the junction box. Lift the cover to release it from the boiler base and withdraw the cover from
the boiler cabinet. This will expose the Line Voltage barrier strip.

o With an AC voltmeter set on the appropriate scale, measure the voltage across the L1 and L2 terminals

(terminals 1 and 5).

o If 120VAC is not detected, check the electrical service as suggested above. If the service is verified,

inspect the circuit wiring from the panel to the boiler for broken or disconnected conductors.

 24VAC (only check if 120VAC supply is verified).

o Remove the Low Voltage junction box cover. First remove the #10 pan-head Phillips screw securing the

cover to the junction box. Lift the cover to release it from the boiler base and withdraw the cover from
the boiler cabinet. This will expose the Low Voltage barrier strip.

o With an AC voltmeter set on the appropriate scale, measure the voltage across the R and C terminals

(terminals 3 and 1).

o If 24VAC is not detected, check Fuse "C" (see below).

Observe the following precautions when servicing the boiler. Failure to comply with
these may result in fire, property damage, serious injury or death.

Before undertaking any troubleshooting procedures it is highly recommended to have
available a digital multimeter(s) capable of measuring AC and DC volts, Amperes,
Resistance (ohms) and Continuity.

80

Figure 17-1(a) Lx150-400

Figure 17-1(b) Lx500-800

Control Panel Fuse Locations

Control Panel Fuse Location

Fuse “C” ATO
2A 32V Auto
Blade Type

Fuse “A” 3AG
7A 250V
Fast-Acting

Fuse “B” 3AG
7A 250V
Fast-Acting

Fuse “A” 3AG
7A 250V
Fast-Acting

Trinity Lx │Installation and Operation Instructions Lx Series

Fuses

There are three (3) fuses associated with the Trinity Lx150-400 controller but only one (1) with the Lx500-800
controller. Check these fuses before replacing the controller or any other electrical component; if the fuse is
blown, it will prevent the protected device(s) from functioning.

To check, and if necessary replace, the fuses:

 Remove all 120VAC power from the boiler. Be careful to check that the unit is not powered from more than

one source e.g. a UPS (uninterruptible power supply).

 Remove the front cover.
 On models Lx150-400 the control panel is located below the heat exchanger. Fuses "A" and "B" are

accessible by removing the spring-loaded knurled knob of their respective holders. Push the knob toward
the panel, and twist approximately 1/4 turn counter-clockwise.

 To access Fuse "C", remove the two #10 pan-head Phillips screws and lift the top cover from the panel. The

auto blade type fuse is installed in an "inline" style fuse holder.

 On models Lx500-800, the control panel is located above the heat exchanger toward the back of the unit.

Fuse "A" is accessible by removing the spring-loaded knurled knob from its holder. Push the knob toward
the panel, and twist approximately 1/4 turn counter-clockwise.

After inspecting and if necessary replacing fuses, replace the panel cover and front cover. Restore power to the
boiler and confirm proper operation.

Only replace fuses with identical parts, see Figures 17-1(a) and (b). Failure to follow
this warning may result in component failure, fire, property damage, serious injury or
death.

81

Figure 17-2 Touch-screen Display Electrical Disconnects

Power Supply Connector (2 by 2)

Communication Connector (4 by 1)

Red

Black

Blue

Blue (White on bottom)

Red

Red

Green

Green

Black

White

Red

Black

Lx Series Installation and Operation Instructions │Trinity Lx

User Interface (Touch-screen Display)

A blank screen does not necessarily indicate a problem; the display may be configured to automatically blank the
screen after a pre-set interval. Simply touch the screen to activate it. Confirm that 120V power is being supplied
to the boiler. If the screen does not become active, perform the following procedure:

Blank Screen

1. Remove the front cover from the boiler.

2. Remove the control panel cover and check Fuse “C” (Auto Blade Type); if faulty check for shorts in the

thermostat wiring, correct, then replace fuse (see Figure 17-1).

3. Ensure the “2 by 2” Molex connector, located behind the display at the top, is connected and that the wires

are fully inserted (see Figure 17-2). Verify that 24VAC is present between the Blue and Red wires; if not
trace wiring back to 24VAC transformer; correct wiring and/or replace transformer [see applicable Figure
13-1(a) or 13-2(a)].

4. Remove the display assembly from the control panel and check the 24VAC wiring connection on the back of

the display; Blue to terminal 7 [24VAC (COM)], Red to terminal 8 [24VAC].

System Disconnected

If the Touch-screen Display is not blank, but is displaying “System Disconnected!” in the middle of the screen,
ensure the 4 by 1 Molex connector, located behind the display at the top, is connected and that the wires are fully
inserted (see Figure 17-2). If the connector appears to be fine, check the wiring connections on the back of the
touch-screen display; Green, Red and Black go to terminals 1, 2 and 3 respectfully.

DO NOT drop the plastic housing or allow it to swing down freely, it may be damaged
by forceful impact.

82

Table 17-1 Troubleshooting Chart

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

Display shows “System

Disconnected” constantly

Communication wire disconnected

See, “System Disconnected!” above.

Faulty Sola controller

If 24VAC present at controller terminals J8 1 & 2,
check Power LED on controller. Verify that
connector J8 is securely plugged into the
controller. Recycle power to boiler, if controller
does not operate, replace the controller.

Burner not operating

Heat demand satisfied; no call for
heat

Check Demand and Set points via Touchscreen.
Check thermostat and DHW aquastat (if
applicable) setting.

Boiler outlet temperature exceeds
“Setpoint - On Hysteresis”

Check outlet temperature, setpoint and hysteresis
settings via Touchscreen.

Hold delay or Lockout

Check Summary page on Touchscreen for code.

Burner switch off

Check Summary page, if Demand indicates

“Burner switch off” go to diagnostics burner test

page and switch on.

Lockout 2 – Waiting for
safety data verification

Safety parameter(s) has been
adjusted

Changing settings that are considered safety

parameters require “Safety data verification”.

Refer to Appendix A.

Lockout 9 – Flame bias out of
range

4-20mA input being overdriven.

If using 4-20mA input, check to ensure current is
not greater than 21mA.

Control malfunction

Cycle power, if problem returns replace control.

Hold 27 – Flame rod shorted
to ground detected

A flame circuit shorted to ground
may show up as a flame circuit
timeout. Zero-ohm shorts can
display as Hold 27.

Check to ensure condensate drain is not blocked.
Check to ensure no voltage applied to R & T
terminals. If using 4-20mA input, check to ensure
current is not greater than 21mA.

Hold 61 – Anti short-cycle

Demand off

Check demand. Delay is to prevent rapid cycling
of burner.

Hold 62 – Fan speed not
proved

Normal Operation (Drive to
Lightoff)

Hold 62 is momentarily displayed prior to burner
ignition during the Drive to Lightoff.

Blown fuse

Check Fuse "A", blown fuse prevents blower
from operating.

Wiring defect

Inspect blower wiring, ensure connectors at Sola
controller and blower are securely attached.

- Faulty Sola controller

- Faulty Blower

If Hold 62 persists for 15 seconds or more, while
the blower is running, check "Fan speed"
indicated on display. If "LOW RPM", "HIGH
RPM", “0” or rapidly changing RPM value is
displayed, try connecting another Sola controller.

If problem remains, replace blower.

Trinity Lx │Installation and Operation Instructions Lx Series

Summary and Diagnostics Display – The Trinity Lx controller and Touchscreen display provides detailed

operational and diagnostic information for aid in troubleshooting. When power is applied to the boiler the
initial page displayed is the Summary page. Information presented on the Summary page includes Demand
source, Burner state, status of sensors and pumps, and so forth. Any current Alert or Lockout condition is also
displayed. Accessible from the Summary page are the Diagnostics pages. Refer to the controller manual for
more information.

Lockout and Alert History – The controller maintains a record of the fifteen (15) most recent events for both

Lockouts and Alerts. To display the logs, touch the History button on the Summary page (refer to Section 7.0
in Appendix A - Controller and Touchscreen Display Instructions). In any situation where malfunction is
suspected, always check the Alerts and Lockouts history. Entries recorded in the history provide useful
information for determining the cause of the malfunction.

83

Table 17-1 Troubleshooting Chart

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

Hold 63 – LCI OFF (Limit
control input)

Replacement control incorrectly
configured.

LCI must be set to “enable” on all Lx models,
excluding Lx150/150E units with a serial number
of 49351 or lower and Lx200/400 units with a
serial number of 48251 or lower. See instructions
included with replacement controller.

Lockout or Hold 65 –
Interrupted Air Switch OFF

No problem, normal operation

Hold 65 will normally be displayed momentarily
during the drive to light-off.

Blown fuse

Check Fuse "A", blown fuse prevents blower
from operating.

Faulty blower

If Fuse “A” is good and blower remains off, check

120VAC supply to blower, if present replace
blower. If blower is on proceed to next step.

Blocked venting

Check for blockage of the exhaust vent.

Blocked air inlet

Check for blockage of the air inlet.

Disconnected, damaged or blocked
tubing

Inspect the clear vinyl tubing connecting the air
switch + and – ports to the air metering elbow.
Condensation or other foreign matter may be
obstructing the tubing, preventing the switch from
sensing differential pressure caused by air flow
through the metering elbow.

Incorrect air switch setting

Contact NTI technical support.

Faulty air proving switch

If venting and air inlet are clear, temporarily
jumper the air switch. If the unit lights and
operates smoothly – replace air switch. If the unit
fails to light or lights but runs rough or abruptly
shuts down – check boiler internals for blockage.

WARNING Only jumper the air switch for

diagnosing purposes.

Tripped High Vent Pressure Switch
(Lx300-400 only)

The high vent pressure switch will trip when the
combustion chamber is blocked. Clean
combustion chamber and reset switch.

Tripped Thermal Fuse
(Lx300-400 only)

Check Thermal Fuse on the back of the heat
exchanger (accessed from the rear of the cabinet).
If tripped contact NTI.

Tripped Door Reset Safety Switch
(Lx300-800 only)

The Door Reset Safety Switch will trip with the
combustion chamber gets dirty or the door
insulation fails. Clean the combustion chamber,
inspect the door insulation and reset the switch.

Incorrect air switch wiring

Check that the red and orange wires are connected
to quick connect tabs 3 and 1 respectively.

Hold 66 – Interrupted air
switch ON (and blower is off)

Incorrect air switch setting

Contact NTI technical support.

Incorrect air switch wiring

Check that the red and orange wires are connected
to quick connect tabs 3 and 1 respectively.

Faulty air switch

Disconnect red and orange wires from air switch
and check for open circuit between terminals 1 &

3. If continuity detected, replace air switch.

Hold 66 – Interrupted air
switch ON (and blower is on)

- Blower problem

- Faulty controller

Check low voltage wiring from blower to
controller. Check VDC signal from red–green
and black-green; if not 28-32VDC and 0 VDC
respectfully – replace controller. If signal is
correct – replace blower.

Lx Series Installation and Operation Instructions │Trinity Lx

84

Table 17-1 Troubleshooting Chart

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

Lockout or Hold 67 – ILK
OFF

Insufficient water pressure (Lx150­400 only)

Ensure at least 15PSI at boiler outlet. Refer to
Supplementary Documentation section 2.0 System
Piping.

External Limit Tripped

Indication that an external limit (wired to “LIM”)

is open. Not a problem with boiler, check
external limit.

Insufficient flow for Flow Switch
(Lx500-800 only)

Check plumbing, ensure circulator is operating.

Tripped Thermal Fuse (Lx500-800
only)

Check Thermal Fuse on the back of the heat
exchanger (accessed from the rear of the cabinet).
If tripped contact NTI.

Tripped High Vent Pressure Switch
(Lx500-800 only)

The high vent pressure switch will trip when the
combustion chamber is blocked or venting is too
restrictive. Check venting and clean combustion
chamber.

Lockout or Hold 79 – Outlet
High Limit

CH or DHW settings

Check if CH and/or DHW setpoint temperature
plus off hysteresis exceed “High limit” setpoint –
factory setting = 210°F (99°C).

CH or DHW pump problem

See "Inoperative CH or DHW pump" below.

Incorrect “Outlet high limit” setting

Increase “Outlet high limit” setting; maximum

setting = 210°F (99°C).

Incorrect “Outlet high limit

response” setting (Lx150-400 boiler

applications only)

Unless deemed unacceptable by local installation
codes, the “Outlet high limit response” should be
set to “recycle and hold” to prevent lockout.

Lockout or Hold 81 – Delta T
limit
OR
Boiler making banging or
hissing sounds

Insufficient water flow

 Check Fuse "A"
 Check boiler pump.
 Ensure plumbing is correct. Refer to

Supplementary Documentation section 2.0
System Piping. Check that water pressure is at
least 15PSI.

 Boilers Only - Boiler heat transfer surfaces

may be fouled with scale or magnetite. Clean
with Fernox DS-40 Descaler and Cleanser. See
Table 10-1.

Lockout 82 – Stack limit

Dirty heat exchanger

Inspect and if required clean the combustion
chamber and/or heat exchanger. Refer to Section

14.0 Annual Maintenance and Inspection and
Section 10.0 System Piping.

Incorrect “Stack limit setpoint”

Unless installed in Canada with PVC exhaust

venting, set “Stack limit setpoint” to maximum

setting of 220ºF (104ºC). In Canada PVC exhaust
venting is limited to 149ºF (65ºC).

Faulty sensor

Check resistance of stack sensor and compare to
thermistor resistance chart, see Table 17-2.

Lockout or Hold 85 –
Inlet/Outlet Inversion Limit

Pump flowing in the wrong
direction

Ensure water circulation is flowing into the boiler
at the fitting closest to the wall.

Incorrect factory sensor wiring

Disconnect flue sensor cable; screen should
display “Hold 95 – Stack sensor fault”; if not
contact NTI.

Lockout or Hold 88 – Outlet
T Rise limit

Insufficient water flow

See Lockout or Hold 81.

Trinity Lx │Installation and Operation Instructions Lx Series

85

Table 17-1 Troubleshooting Chart

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

Hold 91– Inlet sensor fault

Sensor disconnected

 Verify that 2-position Molex connector on

wiring harness is securely attached to mating
connector on inlet sensor.

 Inspect sensor wiring.

Faulty sensor

Check resistance of sensor and compare to
thermistor resistance chart, see Table 17-2.

Hold 92 – Outlet sensor fault

Sensor disconnected

 Verify that 4-position Molex connector on

wiring harness is securely attached to mating
connector on outlet sensor.

 Inspect sensor wiring.

Faulty sensor

Check resistance of sensor and compare to
thermistor resistance chart, see Table 17-2.

Hold 95 – Stack sensor fault

Sensor disconnected

 Verify that 4-position Molex connector on

wiring harness is securely attached to mating
connector on stack sensor.

 Inspect sensor wiring.

Faulty sensor

Check resistance of sensor and compare to
thermistor resistance chart, see Table 17-2.

Lockout 109 – Ignition failure
occurred
(Lx500-800 only)

Or

Hold 110 – Ignition failure
occurred, failure to prove
flame after 3 ignition attempts
(Lx150-400 only)

Spark cable disconnected

Ensure that the high voltage spark cable is
securely connected to the spark generator and the
igniter electrode. Check that the green ground

wire is securely attached to the ¼” quick connect

tab on the igniter electrode.

Insufficient gas line pressure

Ensure the manual gas shutoff valve is open.
Refer to manual section 9.0 GAS VALVE AND
BURNER SETUP.

Flame rod disconnected

Verify that the flame rod signal wire is securely
attached to the flame rod, which is located bottom
center of the burner door.

No 120VAC to Spark Generator

Check wiring from controller to spark generator.
With an AC voltmeter measure voltage across J5­6 and ground (the controller chassis is connected
to the 120VAC supply ground) during trial for
ignition.

Faulty Spark Generator

During trial for ignition check for arc on spark
electrode via the observation port located next to
the spark electrode in the burner door. If the spark
generator is receiving 120VAC and no spark is
observed, replace the spark generator.

No 24VAC to Gas Valve

Check the wiring harness for loose or interrupted
connections of the gas valve wiring. With an AC
voltmeter, measure the voltage from controller
terminals J5-2 to J4-10. There should be 24VAC
present during trial for ignition.

Faulty Gas Valve

The gas valve emits an audible click when it
switches on or off. If the controller is providing
24VAC to the gas valve, and the wiring is intact,
it should be possible to detect if the valve is
responding.

Lockout 113 – Flame circuit
timeout

A flame circuit shorted to ground
may show up as a flame circuit
timeout. High resistance shorts can
display as Lockout 113.

Check to ensure condensate drain is not blocked.
Check to ensure no voltage applied to R & CH
terminals. If using 4-20mA input, check to ensure
current is not greater than 21mA.

Lx Series Installation and Operation Instructions │Trinity Lx

86

Table 17-1 Troubleshooting Chart

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

Lockout 122 – Lightoff rate
proving failed

Blower is not turning on

See “Blower not operating” below.

Missing or incorrect blower
feedback signal

See Hold 62 above.

Blower is always on

See “Blower operating at high speed while burner
is off” below.

Alert 128 - Modulation rate
was limited due to IAS was
open (Air switch open while
burner firing)

Blocked venting

Check for blockage of the exhaust vent.

Blocked air inlet

Check for blockage of the air inlet.

Lockout 173 - Pilot relay
feedback incorrect

Lockout 174 – Safety relay
feedback incorrect

External Electrical Noise

Look for sources of electrical noise, i.e. a large
motor or multiple pieces of equipment starting at
the same time.

Failing Limit Switch in ILK circuit

Check operation of internal LWCO, and/or
external limit (i.e. devise connected between “R”
and “LIM”); replace as necessary

Hardware failure of Sola controller

Reset power, If problem persists replace Sola
controller.

Alert 206 – Lead Lag header
temperature was invalid

System Sensor not connected

If desired, install System Sensor and wire to
sensor input connections “SYSTEM” and
“SENSOR COM”. Otherwise ignore Alert 206

Alert 233 – Lead Lag outdoor
temperature was invalid

See Alert 248

Alert 248 – CH outdoor
temperature was invalid

Outdoor sensor not connected

The Trinity Lx is factory set with Outdoor Reset
enabled. Connect outdoor sensor or disable
Outdoor Reset.

Outdoor sensor wiring

Check wiring of outdoor sensor. Wires should
connect to Low Voltage barrier terminals 11 & 12.

Faulty sensor

Check sensor. Should be free of ice and snow.
Check resistance of sensor and compare to
thermistor resistance chart, see Table 17-2.

Alert 311 – Run was
terminated due to interrupted
air flow switch was off

Blocked venting

Check for blockage of the exhaust vent.

Blocked air inlet

Check for blockage of the air inlet.

Disconnected, damaged or blocked
tubing

Inspect the clear vinyl tubing connecting the air
switch + and – ports to the air metering elbow.
Condensation or other foreign matter may be
obstructing the tubing, preventing the switch from
sensing differential pressure caused by air flow
through the metering elbow.

Incorrect air switch setting

Contact NTI technical support.

Blown fuse

Check Fuse "A".

Inoperative CH and/or DHW
pump

Blown fuse

Check Fuse "B".

Faulty controller

If Fuse “B” not blown, and controller is operating,

navigate to pump diagnostic on display. Manually
switch pump on, check for 120VAC at pump
connection terminal on line voltage barrier strip. If
120VAC not detected, replace controller.

Faulty pump

If 120VAC supplied to pump, and pump does not
operate, replace pump.

Trinity Lx │Installation and Operation Instructions Lx Series

87

Table 17-1 Troubleshooting Chart

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

Blower operating at high
speed while burner off

Blower signal cable disconnected

 Verify that the 5-position Molex connector on

the wiring harness is securely connected to its
mating connector on the blower.

 Check that the 4-position Molex connector on

wiring harness is securely connected to its
mating connector on the controller.

Blower operating at high
speed while burner off

No 24VAC to controller

 Check Power LED on controller.
 Check Fuse "C".
 With an AC voltmeter measure voltage at

terminals J8 1 & 2, 24VAC should be present.

Blower not operating

Blower power disconnected

Verify that the 3-position Molex connector on the
wiring harness is securely connected to its mating
connector on the blower.

Blown fuse

Check Fuse "A" using the procedure described
above. Fuse "A" protects the blower as well as the
ignition spark generator and boiler pump.

Faulty blower

Measure voltage across pins 1 & 2 (black and
white wires) of 3-position connector on wiring
harness. If 120VAC detected, replace power
connector and remove 5-position signal connector.
Blower should rotate at high speed. If blower does
not rotate, replace blower.

Table 17-2 Thermistor Resistance vs. Temperature

Temp °F (°C)

Resistance Ohms (Ω)

Temp °F (°C)

Resistance Ohms (Ω)

-22 (-30)

176,133

122 (50)

3,603

-4 (-20)

96,761

131 (55)

2,986

14 (-10)

55,218

140 (60)

2,488

32 (0)

32,650

149 (65)

2,083

41 (5)

25,390

158 (70)

1,752

50 (10)

19,900

167 (75)

1,481

59 (15)

15,710

176 (80)

1,258

68 (20)

12,490

185 (85)

1,072

77 (25)

10,000

194 (90)

918

86 (30)

8,057

203 (95)

789

95 (35)

6,531

212 (100)

680

104 (40)

5,327

230 (110)

506

113 (45)

4,369 - -

Table 17-3 Hold and Lockout Codes

Code

Description

Note

0

None

Hold / No lockout

1

Unconfigured safety data

Lockout

2

Waiting for safety data verification

Lockout

3

Internal fault: Hardware fault

Hold

4

Internal fault: Safety Relay key feedback error

Hold

5

Internal fault: Unstable power (DCDC) output

Hold

6

Internal fault: Invalid processor clock

Hold

7

Internal fault: Safety relay drive error

Hold

Lx Series Installation and Operation Instructions │Trinity Lx

88

Table 17-3 Hold and Lockout Codes

Code

Description

Note

8

Internal fault: Zero crossing not detected

Hold

9

Internal fault: Flame bias out of range

Hold

10

Internal fault: Invalid Burner control state

Lockout

11

Internal fault: Invalid Burner control state flag

Lockout

12

Internal fault: Safety relay drive cap short

Hold

13

Internal fault: PII shorted to ILK

Hold / Lockout

14

Internal fault: HFS shorted to LCI

Hold / Lockout

15

Internal fault: Safety relay test failed due to feedback ON

Lockout

16

Internal fault: Safety relay test failed due to safety relay OFF

Lockout

17

Internal fault: Safety relay test failed due to safety relay not OFF

Lockout

18

Internal fault: Safety relay test failed due to feedback not ON

Lockout

19

Internal fault: Safety RAM write

Lockout

20

Internal fault: Flame ripple and overflow

Hold

21

Internal fault: Flame number of sample mismatch

Hold

22

Internal fault: Flame bias out of range

Hold

23

Internal fault: Bias changed since heating cycle starts

Hold

24

Internal fault: Spark voltage stuck low or high

Hold

25

Internal fault: Spark voltage changed too much during flame sensing time

Hold

26

Internal fault: Static flame ripple

Hold

27

Internal fault: Flame rod shorted to ground detected

Hold

28

Internal fault: A/D linearity test fails

Hold

29

Internal fault: Flame bias cannot be set in range

Hold

30

Internal fault: Flame bias shorted to adjacent pin

Hold

31

Internal fault: SLO electronics unknown error

Hold

32

Internal fault: Safety Key 0

Lockout

33

Internal fault: Safety Key 1

Lockout

34

Internal fault: Safety Key 2

Lockout

35

Internal fault: Safety Key 3

Lockout

36

Internal fault: Safety Key 4

Lockout

37

Internal fault: Safety Key 5

Lockout

38

Internal fault: Safety Key 6

Lockout

39

Internal fault: Safety Key 7

Lockout

40

Internal fault: Safety Key 8

Lockout

41

Internal fault: Safety Key 9

Lockout

42

Internal fault: Safety Key 10

Lockout

43

Internal fault: Safety Key 11

Lockout

44

Internal fault: Safety Key 12

Lockout

45

Internal fault: Safety Key 13

Lockout

46

Internal fault: Safety Key 14

Lockout

47

Flame rod to ground leakage

Hold

48

Static flame (not flickering)

Hold

49

24VAC voltage low/high

Hold

50

Modulation fault

Hold

51

Pump fault

Hold

52

Motor tachometer fault

Hold

53

AC inputs phase reversed

Lockout

54

Safety GVT model ID doesn’t match application’s model ID

Lockout

55

Application configuration data block CRC errors

Lockout

56-57

RESERVED

Trinity Lx │Installation and Operation Instructions Lx Series

89

Table 17-3 Hold and Lockout Codes

Code

Description

Note

58

Internal fault: HFS shorted to IAS

Lockout

59

Internal fault: Mux pin shorted

Lockout

60

Internal fault: HFS shorted to LFS

Lockout

61

Anti short cycle

Hold

62

Fan speed not proved

Hold

63

LCI OFF

Hold

64

PII OFF

N/A

65

Interrupted Airflow Switch OFF

Hold

66

Interrupted Airflow Switch ON

Hold

67

ILK OFF

Hold

68

ILK ON

N/A

69

Pilot test hold

Hold

70

Wait for leakage test completion

Hold

71

Input power frequency mismatch

Lockout

72-77

RESERVED

78

Demand lost in run

Hold

79

Outlet high limit

Hold

80

DHW high limit

Disabled

81

Delta T limit

Hold / Lockout

82

Stack limit

Lockout

83

Delta T exchanger/outlet limit

Disabled

84

Delta T inlet/exchanger limit

Disabled

85

Inlet/Outlet inversion limit (See Table 17-1)

Hold

86

Exchanger/outlet inversion limit

Disabled

87

Inlet/exchanger inversion limit

Disabled

88

Outlet T-Rise limit (See Table 17-1)

Lockout

89

Exchanger T-rise limit

Disabled

90

Heat exchanger high limit

Disabled

91

Inlet sensor fault

Hold

92

Outlet sensor fault

Hold

93

DHW sensor fault

Hold

94

Header sensor fault

Hold

95

Stack sensor fault

Hold

96

Outdoor sensor fault

Hold

97

Internal fault: A2D mismatch

Lockout

98

Internal fault: Exceeded VSNSR voltage tolerance

Lockout

99

Internal fault: Exceeded 28V voltage tolerance

Lockout

100

Pressure sensor fault

Hold

101

Exchanger sensor fault

Disabled

102-104

RESERVED

105

Flame detected out of sequence

Hold / Lockout

106

Flame lost in MFEP

Lockout

107

Flame lost early in run

Lockout

108

Flame lost in run

Lockout

109

Ignition failed

Lockout

110

Ignition failure occurred

Hold

111

Flame current lower than WEAK threshold

Hold

112

Pilot test flame timeout

Lockout

113

Flame circuit timeout

Lockout

Lx Series Installation and Operation Instructions │Trinity Lx

90

Table 17-3 Hold and Lockout Codes

Code

Description

Note

114-115

RESERVED

116

Wait for OK to Run

Disabled

117

Flap valve condensate fault

Disabled

118

Controller interaction system fault

Hold

119

Controller interaction communications fault

Hold

120

Flap valve backflow fault

Disabled

121

Flap valve fault

Disabled

122

Light off rate proving failed

Lockout

123

Purge rate proving failed

Lockout

124

High fire switch OFF

Hold

125

High fire switch stuck ON

Hold

126

Low fire switch OFF

Hold

127

Low fire switch stuck ON

Hold

128

Fan speed failed during pre-purge

Hold / Lockout

129

Fan speed failed during pre-ignition

Hold / Lockout

130

Fan speed failed during ignition

Hold / Lockout

131

Fan movement detected during standby

Hold

132

Fan speed failed during run

Hold

133-135

RESERVED

136

Interrupted Airflow Switch failed to close

Hold

137

ILK failed to close

Hold

138

Flame too low

Lockout

139-142

RESERVED

143

Internal fault: Flame bias out of range 1

Lockout

144

Internal fault: Flame bias out of range 2

Lockout

145

Internal fault: Flame bias out of range 3

Lockout

146

Internal fault: Flame bias out of range 4

Lockout

147

Internal fault: Flame bias out of range 5

Lockout

148

Internal fault: Flame bias out of range 6

Lockout

149

Flame detected

Hold / Lockout

150

Flame not detected

Hold

151

High fire switch ON

Hold / Lockout

152

Combustion pressure ON

Hold / Lockout

153

Combustion pressure OFF

Hold / Lockout

154

Purge fan switch ON

Hold / Lockout

155

Purge fan switch OFF

Hold / Lockout

156

Combustion pressure and Flame ON

Hold / Lockout

157

Combustion pressure and Flame OFF

Lockout

158

Main valve ON

Lockout

159

Main valve OFF

Lockout

160

Ignition ON

Lockout

161

Ignition OFF

Lockout

162

Pilot valve ON

Lockout

163

Pilot valve OFF

Lockout

164

Block intake ON

Lockout

165

Block intake OFF

Lockout

166-168

RESERVED

169

Safety opto bad in test state

Lockout

170

Safety relay opto feedback incorrect

Lockout

Trinity Lx │Installation and Operation Instructions Lx Series

91

Table 17-3 Hold and Lockout Codes

Code

Description

Note

171

Safety relay feedback incorrect in run

Lockout

172

Main relay feedback incorrect

Lockout

173

Pilot relay feedback incorrect

Lockout

174

Safety relay feedback incorrect

Lockout

175

Safety relay open

Lockout

176

Main relay ON at safe start check

Lockout

177

Pilot relay ON at safe start check

Lockout

178

Safety relay ON at safe start check

Lockout

179-180

RESERVED

181

Invalid Blocked condensate enable setting

Disabled

182

Invalid J7-1 configuration, both LFS and Blocked condensate

Disabled

183

Invalid J7-2 configuration, both HFS and Flap valve

Disabled

184

Invalid BLOWER/HSI output setting

Lockout

185

Invalid Delta T limit enable setting

Lockout

186

Invalid Delta T limit response setting

Lockout

187

Invalid DHW high limit enable setting

Lockout

188

Invalid DHW high limit response setting

Lockout

189

Invalid Flame sensor type setting

Lockout

190

Invalid interrupted air switch enable setting

Lockout

191

Invalid interrupted air switch start check enable setting

Lockout

192

Invalid Igniter on during setting

Lockout

193

Invalid Ignite failure delay setting

Lockout

194

Invalid Ignite failure response setting

Lockout

195

Invalid Ignite failure retries setting

Lockout

196

Invalid Ignition source setting

Lockout

197

Invalid Interlock open response setting

Lockout

198

Invalid Interlock start check setting

Lockout

199

Invalid LCI enable setting

Lockout

200

Invalid light off rate setting

Lockout

201

Invalid Light off rate proving setting

Lockout

202

Invalid Main Flame Establishing Period time setting

Lockout

203

Invalid MFEP flame failure response setting

Lockout

204

Invalid NTC sensor type setting

Lockout

205

Invalid Outlet high limit response setting

Lockout

206

Invalid Pilot Flame Establishing Period setting

Lockout

207

Invalid PII enable setting

Lockout

208

Invalid pilot test hold setting

Lockout

209

Invalid Pilot type setting

Lockout

210

Invalid Post-purge time setting

Lockout

211

Invalid Power up with lockout setting

Lockout

212

Invalid Pre-ignition time setting

Lockout

213

Invalid Pre-purge rate setting

Lockout

214

Invalid Pre-purge time setting

Lockout

215

Invalid Purge rate proving setting

Lockout

216

Invalid Run flame failure response setting

Lockout

217

Invalid Run stabilization time setting

Lockout

218

Invalid Stack limit enable setting

Lockout

219

Invalid Stack limit response setting

Lockout

220

Unconfigured Delta T limit set point setting

Lockout

Lx Series Installation and Operation Instructions │Trinity Lx

92

Table 17-3 Hold and Lockout Codes

Code

Description

Note

221

Unconfigured DHW high limit set point setting

Lockout

222

Unconfigured Outlet high limit set point setting

Lockout

223

Unconfigured Stack limit set point setting

Lockout

224

Invalid DHW demand source setting

Lockout

225

Invalid Flame threshold setting

Lockout

226

Invalid Outlet high limit set point setting

Lockout

227

Invalid DHW high limit set point setting

Lockout

228

Invalid Stack limit set point setting

Lockout

229

Invalid Modulation output setting

Lockout

230

Invalid CH demand source setting

Lockout

231

Invalid Delta T limit delay setting

Lockout

232

Invalid Pressure sensor type setting

Lockout

233

Invalid IAS closed response setting

Lockout

234

Invalid Outlet high limit enable setting

Lockout

235

Invalid Outlet connector type setting

Lockout

236

Invalid Inlet connector type setting

Lockout

237

Invalid DHW connector type setting

Lockout

238

Invalid Stack connector type setting

Lockout

239

Invalid Header connector type setting

Lockout

240

Invalid Outdoor connector type setting

Lockout

241

Exchanger sensor not allowed with stack connector setting

Lockout

242

Invalid DHW auto detect configuration

Lockout

243

Invalid UV with spark interference not compatible with Igniter on throughout

Lockout

244

Internal fault: Safety relay test invalid state

Lockout

245

Invalid Outlet connector type setting for T-rise

Lockout

246

4-20mA cannot be used for both modulation and setpoint control

Lockout

247

Invalid ILK bounce detection enable

Lockout

248

Invalid forced recycle interval

Lockout

249

STAT cannot be demand source when Remote Stat is enabled

Lockout

250

Invalid Fan speed error response

Lockout

251

Lead drop-stage on error setting does not match drop method configuration

Lockout

252

Invalid Line frequency setting

Lockout

253

Lead Lag modulation sensor not valid with setpoint source

Lockout

254

Lead Lag modulation sensor not valid with local setpoint source

Lockout

255

Lead Lag modulation sensor not valid with local modulation source

Lockout

256

Selected Controller interaction enable setting is not allowed

Lockout

257

Controller interaction enable does not match neighbor stack fault setting

Lockout

258

Controller ID must be non-zero if controller interaction is enabled

Lockout

259

Modulation output must be fan if controller interaction is enabled

Lockout

260

Asymmetrical paired (no flap) is set but flap switch input is energized

Lockout

261

Neighbor burner control blower fault detected

Lockout

262

Blower fault detected during flap test

Lockout

263

Invalid DHW demand temperature setting

Lockout

264

Invalid preferred outlet high limit setting

Lockout

265

Invalid preferred lightoff rate setting

Lockout

266

Invalid preferred stack limit rate setting

Lockout

Trinity Lx │Installation and Operation Instructions Lx Series

93

Table 17-4 Alert Codes

Code

Description

0

None (No alert)

1

Alert PCB was restored from factory defaults

2

Safety configuration parameters were restored from factory defaults

3

Configuration parameters were restored from factory defaults

4

Invalid Factory Invisibility PCB was detected

5

Invalid Factory Range PCB was detected

6

Invalid range PCB record has been dropped

7

EEPROM lockout history was initialized

8

Switched application annunciation data blocks

9

Switched application configuration data blocks

10

Configuration was restored from factory defaults

11

Backup configuration settings was restored from active configuration

12

Annunciation configuration was restored from factory defaults

13

Annunciation configuration was restored from backup

14

Safety group verification table was restored from factory defaults

15

Safety group verification table was updated

16

Invalid Parameter PCB was detected

17

Invalid Range PCB was detected

18

Alarm silence time exceeded maximum

19

Invalid safety group verification table was detected

20

Backdoor password could not be determined

21

Invalid safety group verification table was not accepted

22

CRC errors were found in application configuration data blocks

23

Backup Alert PCB was restored from active one

24

RESERVED

25

Lead Lag operation switch was turned OFF

26

Lead Lag operation switch was turned ON

27

Safety processor was reset

28

Application processor was reset

29

Burner switch was turned OFF

30

Burner switch was turned ON

31

Program Module (PM) was inserted into socket

32

Program Module (PM) was removed from socket

33

Alert PCB was configured

34

Parameter PCB was configured

35

Range PCB was configured

36

Program Module (PM) incompatible with product was inserted into socket

37

Program Module application parameter revision differs from application processor

38

Program Module safety parameter revision differs from safety processor

39

PCB incompatible with product contained in Program Module

40

Parameter PCB in Program Module is too large for product

41

Range PCB in Program Module was too large for product

42

Alert PCB in Program Module was too large for product

43

IAS start check was forced on due to IAS enabled

44

Low voltage was detected in safety processor

45

High line frequency occurred

46

Low line frequency occurred

47

Invalid subsystem reset request occurred

48

Write large enumerated Modbus register value was not allowed

Lx Series Installation and Operation Instructions │Trinity Lx

94

Table 17-4 Alert Codes

Code

Description

49

Maximum cycle count was reached

50

Maximum hours count was reached

51

Illegal Modbus write was attempted

52

Modbus write attempt was rejected (NOT ALLOWED)

53

Illegal Modbus read was attempted

54

Safety processor brown-out reset occurred

55

Application processor watchdog reset occurred

56

Application processor brown-out reset occurred

57

Safety processor watchdog reset occurred

58

Alarm was reset by the user at the control

59

Burner control firing rate was > absolute max rate

60

Burner control firing rate was < absolute min rate

61

Burner control firing rate was invalid, % vs. RPM

62

Burner control was firing with no fan request

63

Burner control rate (non-firing) was > absolute max rate

64

Burner control rate (non-firing) was < absolute min rate

65

Burner control rate (non-firing) was absent

66

Burner control rate (non-firing) was invalid, % vs. RPM

67

Fan off cycle rate was invalid, % vs. RPM

68

Set point was over ridden due to sensor fault

69

Modulation was over ridden due to sensor fault

70

No demand source was set due to demand priority conflicts

71

CH 4-20mA signal was invalid.

72

Flame strength rate differential was invalid

73

Flame strength step rate was invalid

74

Periodic forced recycle

75

Absolute max fan speed was out of range

76

Absolute min fan speed was out of range

77

Fan gain down was invalid

78

Fan gain up was invalid

79

Fan minimum duty cycle was invalid

80

Fan pulses per revolution was invalid

81

Fan PWM frequency was invalid

82-83

RESERVED

84

Lead Lag CH 4-20mA water temperature setting was invalid

85

No Lead Lag add stage error threshold was configured

86

No Lead Lag add stage detection time was configured

87

No Lead Lag drop stage error threshold was configured

88

No Lead Lag drop stage detection time was configured

89

Lead Lag all boiler off threshold was invalid

90

Modulation output type was invalid

91

Firing rate control parameter was invalid

92

Forced rate was out of range vs. min/max modulation

93

Forced rate was invalid, % vs. RPM

94

Slow start ramp value was invalid

95

Slow start degrees value was invalid

96

Slow start was ended due to outlet sensor fault

97

Slow start was end due to reference set point fault

98

CH max modulation rate was invalid, % vs. RPM

Trinity Lx │Installation and Operation Instructions Lx Series

95

Table 17-4 Alert Codes

Code

Description

99

CH max modulation rate was > absolute max rate

100

CH modulation range (max minus min) was too small (< 4% or 40 RPM)

101

DHW max modulation rate was invalid, % vs. RPM

102

DHW max modulation rate was > absolute max rate

103

DHW modulation range (max minus min) was too small (< 4% or 40 RPM)

104

Min modulation rate was < absolute min rate

105

Min modulation rate was invalid, % vs. RPM

106

Manual rate was invalid, % vs. RPM

107

Slow start enabled, but forced rate was invalid

108

Analog output hysteresis was invalid

109

Analog modulation output type was invalid

110

IAS open rate differential was invalid

111

IAS open step rate was invalid

112

Mix max modulation rate was invalid, % vs. RPM

113

Mix max modulation rate was > absolute max or < absolute min rates

114

Mix modulation range (max minus min) was too small (< 4% or 40 RPM)

115

Fan was limited to its minimum duty cycle

116

Manual rate was > CH max modulation rate

117

Manual rate was > DHW max modulation rate

118

Manual rate was < min modulation rate

119

Manual rate in Standby was > absolute max rate

120

Modulation commanded rate was > CH max modulation rate

121

Modulation commanded rate was > DHW max modulation rate

122

Modulation commanded rate was < min modulation rate

123

Modulation rate was limited due to outlet limit

124

Modulation rate was limited due to Delta-T limit

125

Modulation rate was limited due to stack limit

126

Modulation rate was limited due to anti-condensation

127

Fan Speed out of range in RUN

128

Modulation rate was limited due to IAS was open

129

Slow start ramp setting of zero will result in no modulation rate change

130

No forced rate was configured for slow start ramp

131

CH demand source was invalid

132

CH P-gain was invalid

133

CH I-gain was invalid

134

CH D-gain was invalid

135

CH OFF hysteresis was invalid

136

CH ON hysteresis was invalid

137

CH sensor type was invalid

138

CH hysteresis step time was invalid

139

CH remote control parameter was invalid

140

CH ODR not allowed with remote control

146

CH control was suspended due to fault

147

CH header temperature was invalid

148

CH outlet temperature was invalid

149

CH steam pressure was invalid

151

Minimum water temperature parameter was greater than setpoint

152

Minimum water temperature parameter was greater than time of day setpoint

155

CH modulation rate source parameter was invalid

Lx Series Installation and Operation Instructions │Trinity Lx

96

Table 17-4 Alert Codes

Code

Description

157

DHW demand source was invalid

158

DHW P-gain was invalid

159

DHW I-gain was invalid

160

DHW D-gain was invalid

161

DHW OFF hysteresis was invalid

162

DHW ON hysteresis was invalid

163

DHW hysteresis step time was invalid

164

DHW sensor type was invalid

165

Inlet sensor type was invalid for DHW

166

Outlet sensor type was invalid for DHW

167

DHW storage OFF hysteresis was invalid

168

DHW storage ON hysteresis was invalid

169

DHW modulation sensor type was invalid

170

DHW modulation sensor was not compatible for Auto mode

171

DHW control was suspended due to fault

172

DHW temperature was invalid

173

DHW inlet temperature was invalid

174

DHW outlet temperature was invalid

175

DHW high limit must be disabled for Auto mode

176

DHW sensor type was not compatible for Auto mode

177

DHW priority source setting was invalid

178

DHW priority method setting was invalid

179

CH S5 (J8-11) sensor was invalid

180

CH Inlet temperature was invalid

181

CH S10 (J10-7) sensor was invalid

182

Lead Lag CH setpoint source was invalid

183

Lead Lag P-gain was invalid

184

Lead Lag I-gain was invalid

185

Lead Lag D-gain was invalid

186

Lead Lag OFF hysteresis was invalid

187

Lead Lag ON hysteresis was invalid

188

Lead Lag slave enable was invalid

189

Lead Lag hysteresis step time was invalid

190

No Lead Lag Modbus port was assigned

191

Lead Lag base load common setting was invalid

192

Lead Lag DHW demand switch setting was invalid

193

Lead Lag Mix demand switch setting was invalid

194

Lead Lag modulation sensor setting was invalid

195

Lead Lag backup modulation sensor setting was invalid

196

Lead Lag slave mode setting was invalid

197

Lead Lag rate allocation setting was invalid

198

Lead selection setting was invalid

199

Lag selection setting was invalid

200

Lead Lag slave return setting was invalid

201

Lead Lag add stage method setting was invalid

202

STAT may not be a Lead Lag CH demand source when Remote Stat is enabled

203

Lead Lag base load rate setting was invalid

204

Lead Lag master was suspended due to fault

205

Lead Lag slave was suspended due to fault

Trinity Lx │Installation and Operation Instructions Lx Series

97

Table 17-4 Alert Codes

Code

Description

206

Lead Lag header temperature was invalid

207

Lead Lag was suspended due to no enabled Program Module installed

208

Lead Lag slave session has timed out

209

Too many Lead Lag slaves were detected

210

Lead Lag slave was discovered

211

Incompatible Lead Lag slave was discovered

212

No base load rate was set for Lead Lag slave

213

Lead Lag slave unable to fire before demand to fire delay expired

214

Adding Lead Lag slave aborted due to add requirement change

215

No Lead Lag slaves available to service demand

216

No Lead Lag active service was set due to demand priority conflicts

217

No Lead Lag add stage method was specified

218

No Lead Lag drop stage method was specified

219

Using backup Lead Lag header sensor due to sensor failure

220

Lead Lag frost protection rate was invalid

221

Lead Lag drop stage method setting was invalid

222

CH frost protection temperature was invalid

223

CH frost protection inlet temperature was invalid

224

DHW frost protection temperature was invalid

225

No anticondensation setpoint was configured for frost protection

226

RESERVED

227

DHW priority override time was not derated due to invalid outdoor temperature

228

Warm weather shutdown was not checked due to invalid outdoor temperature

229

Lead Lag slave communication timeout

230

RESERVED

231

LL set point was invalid

232

LL time of day set point was invalid

233

LL outdoor temperature was invalid

234

LL ODR time of day set point was invalid

235

LL ODR time of day set point exceeded normal set point

236

LL max outdoor set point was invalid

237

LL min outdoor set point was invalid

238

LL min water set point was invalid

239

LL outdoor temperature range was too small (minimum 12 C / 22 F)

240

LL water temperature range was too small (minimum 12 C / 22 F)

241

Lead Lag DHW setpoint was invalid

243

Lead Lag CH demand switch was invalid

244

Lead Lag ODR min water temperature was invalid

245

RESERVED

246

CH set point was invalid

247

CH time of day set point was invalid

248

CH outdoor temperature was invalid

249

CH ODR time of day setpoint was invalid

250

CH ODR time of day set point exceeds normal set point

251

CH max outdoor set point was invalid

252

CH min outdoor setp oint was invalid

253

CH min water set point was invalid

254

CH outdoor temperature range was too small (minimum 12 C / 22 F)

255

CH water temperature range was too small (minimum 12 C / 22 F)

Lx Series Installation and Operation Instructions │Trinity Lx

98

Table 17-4 Alert Codes

Code

Description

259

CH ODR min water temperature was invalid

260

RESERVED

261

DHW set point was invalid

262

DHW time of day set point was invalid

263

DHW storage setpoint was invalid

264

STAT may not be a DHW demand source when Remote Stat is enabled

265

No DHW anticondensation setpoint was configured

266

No CH anticondensation setpoint was configured

267

STAT may not be a CH demand source when Remote Stat is enabled

268

CH 4mA water temperature setting was invalid

269

CH 20mA water temperature setting was invalid

270

Steam 4mA water temperature setting was invalid

271

Steam 20mA water temperature setting was invalid

272

Abnormal Recycle: Pressure sensor fault

273

Abnormal Recycle: Safety relay drive test failed

274

Abnormal Recycle: Demand off during Pilot Flame Establishing Period

275

Abnormal Recycle: LCI off during Drive to Purge Rate

276

Abnormal Recycle: LCI off during Measured Purge Time

277

Abnormal Recycle: LCI off during Drive to Light off Rate

278

Abnormal Recycle: LCI off during Pre-Ignition test

279

Abnormal Recycle: LCI off during Pre-Ignition time

280

Abnormal Recycle: LCI off during Main Flame Establishing Period

281

Abnormal Recycle: LCI off during Ignition period

282

Abnormal Recycle: Demand off during Drive to Purge Rate

283

Abnormal Recycle: Demand off during Measured Purge Time

284

Abnormal Recycle: Demand off during Drive to Light off Rate

285

Abnormal Recycle: Demand off during Pre-Ignition test

286

Abnormal Recycle: Demand off during Pre-Ignition time

287

Abnormal Recycle: Flame was on during Safe Start check

288

Abnormal Recycle: Flame was on during Drive to Purge Rate

289

Abnormal Recycle: Flame was on during Measured Purge Time

290

Abnormal Recycle: Flame was on during Drive to Light off Rate

291

Abnormal Recycle: Flame was not on at end of Ignition period

292

Abnormal Recycle: Flame was lost during Main Flame Establishing Period

293

Abnormal Recycle: Flame was lost early in Run

294

Abnormal Recycle: Flame was lost during Run

295

Abnormal Recycle: Leakage test failed

296

Abnormal Recycle: Interrupted air flow switch was off during Drive to Purge Rate

297

Abnormal Recycle: Interrupted air flow switch was off during Measured Purge Time

298

Abnormal Recycle: Interrupted air flow switch was off during Drive to Light off Rate

299

Abnormal Recycle: Interrupted air flow switch was off during Pre-Ignition test

300

Abnormal Recycle: Interrupted air flow switch was off during Pre-Ignition time

301

Abnormal Recycle: Interrupted air flow switch was off during Main Flame Establishing Period

302

Abnormal Recycle: Ignition failed due to interrupted air flow switch was off

303

Abnormal Recycle: ILK off during Drive to Purge Rate

304

Abnormal Recycle: ILK off during Measured Purge Time

305

Abnormal Recycle: ILK off during Drive to Light off Rate

306

Abnormal Recycle: ILK off during Pre-Ignition test

307

Abnormal Recycle: ILK off during Pre-Ignition time

Trinity Lx │Installation and Operation Instructions Lx Series

99

Table 17-4 Alert Codes

Code

Description

308

Abnormal Recycle: ILK off during Main Flame Establishing Period

309

Abnormal Recycle: ILK off during Ignition period

310

Run was terminated due to ILK was off

311

Run was terminated due to interrupted air flow switch was off

312

Stuck reset switch

313

Run was terminated due to fan failure

314

Abnormal Recycle: Fan failed during Drive to Purge Rate

315

Abnormal Recycle: Fan failed during Measured Purge Time

316

Abnormal Recycle: Fan failed during Drive to Light off Rate

317

Abnormal Recycle: Fan failed during Pre-Ignition test

318

Abnormal Recycle: Fan failed during Pre-Ignition time

319

Abnormal Recycle: Fan failed during Ignition period

320

Abnormal Recycle: Fan failed during Main Flame Establishing Period

321

Abnormal Recycle: Main Valve off after 10 seconds of RUN

322

Abnormal Recycle: Pilot Valve off after 10 seconds of RUN

323

Abnormal Recycle: Safety Relay off after 10 seconds of RUN

324

Abnormal Recycle: Hardware flame bias

325

Abnormal Recycle: Hardware static flame

326

Abnormal Recycle: Hardware flame current invalid

327

Abnormal Recycle: Hardware flame rod short

328

Abnormal Recycle: Hardware invalid power

329

Abnormal Recycle: Hardware invalid AC line

330

Abnormal Recycle: Hardware SLO flame ripple

331

Abnormal Recycle: Hardware SLO flame sample

332

Abnormal Recycle: Hardware SLO flame bias range

333

Abnormal Recycle: Hardware SLO flame bias heat

334

Abnormal Recycle: Hardware SLO spark stuck

335

Abnormal Recycle: Hardware SLO spark changed

336

Abnormal Recycle: Hardware SLO static flame

337

Abnormal Recycle: Hardware SLO rod shorted

338

Abnormal Recycle: Hardware SLO AD linearity

339

Abnormal Recycle: Hardware SLO bias not set

340

Abnormal Recycle: Hardware SLO bias shorted

341

Abnormal Recycle: Hardware SLO electronics

342

Abnormal Recycle: Hardware processor clock

343

Abnormal Recycle: Hardware AC phase

344

Abnormal Recycle: Hardware A2D mismatch

345

Abnormal Recycle: Hardware VSNSR A2D

346

Abnormal Recycle: Hardware 28V A2D

347

Abnormal Recycle: Hardware HFS IAS shorted

348

Abnormal Recycle: Hardware PII INTLK shorted

349

Abnormal Recycle: Hardware HFS LCI shorted

350

Abnormal Recycle: Hardware HFS LFS shorted

351

Abnormal Recycle: Invalid zero crossing

352

Abnormal Recycle: fault stack sensor

353

Abnormal Recycle: stack limit

354

Abnormal Recycle: delta T limit

355

Abnormal Recycle: fault outlet sensor

356

Abnormal Recycle: outlet high limit

Lx Series Installation and Operation Instructions │Trinity Lx

100

Table 17-4 Alert Codes

Code

Description

357

Abnormal Recycle: fault DHW sensor

358

Abnormal Recycle: DHW high limit

359

Abnormal Recycle: fault inlet sensor

360

Abnormal Recycle: Check Parameters Failed

361

Internal error: No factory parameters were detected in control

362

Internal error: PID iteration frequency was invalid

363

Internal error: Demand-Rate interval time was invalid

364

Internal error: Factory calibration parameter for modulation was invalid

365

Internal error: CH PID P-scaler was invalid

366

Internal error: CH PID I-scaler was invalid

367

Internal error: CH PID D-scaler was invalid

368

Internal error: DHW PID P-scaler was invalid

369

Internal error: DHW PID I-scaler was invalid

370

Internal error: DHW PID D-scaler was invalid

371

Internal error: Lead Lag master PID P-scaler was invalid

372

Internal error: Lead Lag master PID I-scaler was invalid

373

Internal error: Lead Lag master PID D-scaler was invalid

374

Abnormal Recycle: Hardware flame bias high

375

Abnormal Recycle: Hardware flame bias low

376

Abnormal Recycle: Hardware flame bias delta high

377

Abnormal Recycle: Hardware flame bias delta low

378

Abnormal Recycle: Hardware flame bias dynamic high

379

Abnormal Recycle: Hardware flame bias dynamic low

380

Abnormal Recycle: Fan Speed Not Proven

381

Abnormal Recycle: Fan Speed Range Low

382

Abnormal Recycle: Fan Speed Range High

383

Abnormal Recycle: Pre-Ignition test failed, recycle

384-388

RESERVED

389

Abnormal Recycle: AC power frequency Mismatch

390-447

RESERVED

448

Flame too low

449

Modulation rate was limited due to flame strength

450

RESERVED

451

Circulator control was invalid

452

Circulator P-gain was invalid

453

Circulator I-gain was invalid

454

Circulator temperature was invalid

455

Circulator outlet temperature was invalid

456

Circulator inlet temperature was invalid

457

Circulator outlet temperature was invalid

458

Circulator sensor choice was invalid

459

Circulator PID setpoint was invalid

460

LCI demand lost in run

461

Demand lost in run

462

STAT demand lost in run

463

Demand lost in run due to no flame

464

LCI lost in Combustion Pressure Establishing Period

465

LCI lost in Combustion Pressure Stabilizing Period

466

RESERVED

Trinity Lx │Installation and Operation Instructions Lx Series