Slant/Fin LYNX LX-85 Installation And Operating Instructions Manual

This manual must be left with owner and should be hung
on or adjacent to the boiler for reference.

LYNX

DIRECT-VENT SEALED COMBUSTION CONDENSING BOILER
HOT WATER MODEL LX-85

GAS-FIRED BOILER FOR NATURAL AND L.P. PROPANE GASES

INSTALLATION AND OPERATING INSTRUCTIONS

TABLE OF CONTENTS

Dimensions, Rating and Orifice Sizes........................................2

Identification of Parts..................................................................3

Installation Requirements ...........................................................4

Additional Installation Requirements for Massachusetts............5

Contamination Prevention...........................................................5

Venting Application .....................................................................5

Boiler Room Air Supply and Ventilation......................................5

Flue gas Venting Requirements..................................................6

Vent Material ..............................................................................6

Air Intake Material ......................................................................6

Vent and Air Intake Restrictions .................................................7

Non-Direct Vent Installation ........................................................8

Sidewall Venting, Non-Direct Vent ..............................................8

Vent Termination Location and Clearance ..................................8

Non-Direct Vent Vertical Venting.................................................8

Direct Vent Installation................................................................8

Sidewall Venting, Direct Vent ......................................................8

Vent/Air Intake Termination Installation.....................................14

Direct Vent, Venting and Air Intake through a Roof ..................15

Venting and Air Intake Regular Inspection ...............................16

Condensate Removal System..................................................16

Gas Piping ................................................................................16

Electrical Wiring ........................................................................17

Wiring Diagram.........................................................................18

Multi Zoning ..............................................................................20

Water Piping .............................................................................23

Operating Instructions...............................................................29

Boiler Control Display...............................................................29

Boiler Control............................................................................29

Sequence of Operation.............................................................35

Gas Input Rate Adjustment ......................................................36

Safety Check ...........................................................................38

Care and Maintenance .............................................................41

General Troubleshooting Guide ................................................42

Conversion to Propane.............................................................43

READ ALL OF THE FOLLOWING

WARNINGS AND STATEMENTS

INSTALLATION INSTRUCTIONS

Installation location ONLY as permitted in paragraph
entitled "LIQUEFIED PETROLEUM (L.P.) PROPANE
GAS-FIRED BOILER LOCATION" on page 4 of this
instruction book.
The above warning does not apply to NATURAL
gas fired boilers.

The installation must conform to the requirements of
the authority having jurisdiction or, in the absence of
such requirements, to the National Fuel Gas Code,
ANSI Z223.1-latest edition. The installation must also
conform to the additional requirements in this Slant/Fin
Instruction Book.

In addition where required by the authority having juris­diction, the installation must conform to American
Society of Mechanical Engineers Safety Code for
Controls and Safety Devices for Automatically Fired
Boilers, No. CSD-1.

IMPORTANT

BEFORE READING THE

WARNING

LIQUEFIED PETROLEUM (L.P.)

PROPANE GAS-FIRED BOILERS

WARNING

The venting system of this boiler is under positive pres­sure. Leakage from this system can be hazardous and if
not avoided can result in death or serious injury. In addi­tion to the recommendations within this manual and the
User’s Information Manua
flue collector to the outdoor discharge, must be carefully
checked annually by a qualified service agency.

Heating Contractor

Address

Phone Number

Printed in U.S.A. 1008 Part No. 84-5736 Publication No. LX-40 Rev. C

l, the venting system, from the

WARNING

This boiler, gas piping and accessories must be
installed, connected, serviced and repaired by a
trained, experienced service technician, familiar with all
precautions required for gas-fired equipment and
licensed or otherwise qualified, in compliance with the
authority having jurisdiction.

Boiler Model Number

Boiler Serial Number

Installation Date

2

Lynx Model LX-85

RATINGS AND DIMENSIONS

WATER INLET (RETURN) - 1" NPT (MALE)

WATER OUTLET (SUPPLY) - 1" NPT (MALE)

5 3/8

2 1/2

23

17 3/4

REAR VIEW

Figure 1. Dimensions data

2 5/8

36 3/4

6 7/8

1 1/2

3 3/8

27 7/8

16 1/4 7

23 3/4

SIDE VIEW

VENT CONNECTION

AIR INTAKE
CONNECTION

12 3/8

33 7/8

GAS SHUTOFF
VALVE
1/2" NPT
(FEMALE)

4 3/4

8 5/8

41

23 5/8

FRONT VIEW

SPECIFICATIONS FOR LX-85 BOILER

Fuel Rate Input: 85,000 BTUH maximum

25,000 BTUH minimum

Boiler Water Volume: .75 gallon (6.25 lbs)

Water Piping Connections: 1" NPT (male)

Gas Piping Connection: 1/2" NPT (female)

Vent Connection: 3" nominal I.D. pipe (PVC, CPVC or stainless steel)

Air Intake Connection: 3" nominal I.D. pipe (PVC, CPVC or stainless steel)

Weight of Boiler (uncrated): 105 lbs.

Gas orifice size: Natural Gas - No orifice used *

Propane - 0.190" diameter **, ID Code: C

*Note: No orifice changes are required for high altitude installations.
**See page 43 for conversion procedure to propane.

Figure 2. Lynx Boiler

Lynx Model LX-85

FIELD WIRING ENTRANCES

FIELD WIRING TERMINALS

LOCATION AND IDENTIFICATION OF PARTS

SPARK ELECTRODE
(IGNITOR)

WINDOW
(SIGHT GLASS)

GAS VALVE

FLUE SENSOR

WATER OUTLET
(SUPPLY)

3

AIR INTAKE CONNECTION

GAS SUPPLY VALVE

TEMPERATURE DISPLAY

MODE DISPLAY

POWER SWITCH

PRESSURE GAUGE

TOP (EXTERIOR)

VENT CONNECTION

VENTURI

HEAT EXCHANGER

FLUE COLLECTOR

WATER INLET
(RETURN)

COMBUSTION
BLOWER

BOILER DRAIN
VALVE

FRONT (INTERIOR)

FLUE SAMPLE PORT

BOILER CONTROL

SEDIMENT TRAP

WATER

COMBUSTION BLOWER

HEAT EXCHANGER
ENCLOSURE
FRONT COVER

CONDENSATE TRAP

RIGHT SIDE (INTERIOR)

SUPPLY SENSOR

WATER HIGH LIMIT

WATER
RETURN SENSOR

CONDENSATE
DRAIN TEE

Figure 3. Location and identification of par ts

4

Lynx Model LX-85

INSTALLATION REQUIREMENTS

The installation must conform to the requirements of the
authority having jurisdiction or, in the absence of such
requirements, to the National Fuel Gas Code, ANSI Z223.1­latest edition.

This installation must also conform to the additional require­ments in this Slant/Fin Instruction Book.

NATURAL GAS-FIRED BOILER LOCATION

Provide a level, solid foundation for the boiler. Location
should be as near as possible to chimney or outside wall so
that the flue pipe from boiler is short and direct. (See Appen­dix A for vent terminal location restrictions.) The
location should also be such that all boiler components are
protected from water (dripping, spraying, rain, etc.) during
appliance operation and service (circulator replacement,
control replacement, etc.).

WARNING
LIQUEFIED PETROLEUM (L.P.) PROPANE GAS-FIRED
BOILER LOCATION

REQUIRES SPECIAL ATTENTION
Liquefied Petroleum (L.P.) propane gas is heavier than air.
Therefore, propane boilers, piping, valves should NOT be
installed in locations where propane leaking from defective
equipment and piping will "pool" in a basement or other
space below the leak.

A spark or flame from the boiler or other source may ignite
the accumulated propane gas causing an explosion or fire.
Provide a level, solid foundation for the boiler. Location
should be as near the chimney as possible so that the flue
pipe from boiler to chimney is short and direct.

The UNIFORM MECHANICAL CODE ma y be in effect in
your geographic area.

The following precautions are cited by the 1994 UNIFORM
MECHANICAL CODE, section 304.6:

"LPG Appliances. Liquefied petroleum gas-burning
appliances shall not be installed in a pit, basement or
similar location where heavier-than-air-gas might collect.
Appliances so fueled shall not be installed in an above­grade under-floor space or basement unless such loca­tion is provided with an approved means for removal of

unburned gas."
Consult Chapter 5 of the 1994 UNIFORM MECHANICAL
CODE for design criteria of the "approved" means for
removal of unburned gas.

MINIMUM CLEARANCES FROM COMBUSTIBLE
CONSTRUCTIONS

A. Minimum clearances to the exterior surfaces of the boiler

shall be as follows:
MINIMUM ALCOVE AND CLOSET CLEARANCE

For Combustible Recommended
Surface
Front 6" 18"
Rear 0" 0"
Left Side 0" 5"
Right Side 0" 5"
Top 5" 18"
Flue Connector:

Enclosed — 2" 6"
Uninclosed — 1" 6"

B. Provide accessibility clearance of 8" on sides requiring

servicing and 18" on sides used for passage.

C. All minimum clearances shown above must be met. This

may result in increased values of some minimum clear­ances in order to maintain the minimum clearances of
others.

D. Clearance from hot water pipes shall be 1 inch**.

** At points where hot water pipes emerge from a floor, wall or ceiling,

the clearance at the opening through the finished floor boards or wall
or ceiling boards may be not less than 1/2 inch. Each such opening
shall be covered with a plate of uncombustible material.

Construction for Service

1"*

5"

6"

BOILER FOUNDATION

A. Provide a solid, level foundation capable of supporting

the weight of the boiler filled with water, and extending at
least 2" past the jacket on all sides. See dimensions of
boilers, page 2.

B. Boiler can be installed on both combustible and

non-combustible floors, but must NOT be installed on or
above carpeting.

C. If boiler is to be located over buried conduit containing

electric wires or telephone cables, consult local codes or
the National Board of Fire Underwriters for specific
requirements.

* 2" FOR ENCLOSED

Figure 4. Lynx boiler min. clearances for combustible
construction.

SAFETY

KEEP THE BOILER AREA CLEAR AND FREE FROM
COMBUSTIBLE MATERIALS, GASOLINE AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.

Lynx Model LX-85

5

CONTAMINATION PREVENTION

The combustion air supply must not be susceptible to contamination
sources, whether the combustion air comes from the interior or exterior of
the building. Contaminated air can cause corrosion or other damage to the
heat exchanger and components of the boiler, causing failure of these
parts or unsafe operation.

Below is a list of products and areas which may cause
contaminated combustion air:

PRODUCTS TO AVOID

• Spray cans containing chloro/fluorocarbons

• Permanent wave solutions

• Chlorinated waxes/cleaners

• Chlorine-based swimming pool chemicals

• Calcium chloride used for thawing

• Sodium chloride used for water softening

• Refrigerant leaks

• Paint or varnish removers

• Hydrochloric acid/muriatic acid

• Cements and glues

• Antistatic fabric softeners used in clothes dryers

• Chlorine-type bleaches, detergents, and cleaning
solvents found in household laundry rooms

• Adhesives used to fasten building products and other
similar products

AREAS LIKELY TO HAVE CONTAMINANTS

• Dry cleaning/laundry areas and establishments

• Swimming pools

• Metal fabrication plants

• Beauty shops

• Refrigeration repair shops

• Photo processing plants

• Auto body shops

• Plastic manufacturing plants

• Furniture refinishing areas and establishments

• New building construction

• Remodeling areas

• Garages with workshops

VENTING APPLICATION

The Lynx LX-85 is a sealed combustion type boiler, it may be installed
and vented either as a direct vent boiler which all air for combustion is
obtained directly from outside or as a non-direct vent boiler which air for
combustion is taken from inside the boiler room.

The Lynx LX-85 boiler must be vented by 3" diameter PVC/CPVC sched­ule 40 pipe, or the proper 3” diameter
stainless steel venting system (see “vent material” on page 6) through the
roof or sidewall. An optional adapter is available for connecting stainless
steel venting to the boiler vent outlet.
See the Lynx LX-85 Parts List, publication # LX-10PL.

BOILER ROOM AIR SUPPLY AND VENTILATION

An ample supply of air is required for combustion and ventilation. When
buildings are insulated, caulked and weather-stripped, now or later on,
direct openings to outside may be required and should be provided. If the
boiler is not near an outside wall, air may be ducted to it from outside wall
openings.

Provisions for combustion and ventilation air must be made in accordance
with section 5.3, Air for Combustion and Ventilation, of the National Fuel
Gas Code, ANSI Z223.1-latest edition, or applicable provisions of the local
building codes. The following recommendation applies to buildings of
energy-saving construction, fully caulked and weatherstripped.

INSTALLATION IN ENCLOSED BOILER ROOM REQUIRES TWOUNOBSTRUCT­ED OPENINGS FOR PASSAGE OF AIR INTO THE BOILER

ROOM.

ADDITIONAL REQUIREMENTS FOR THE COMMONWEALTH
OF MASSACHUSETTS

When the Lynx-85 is installed and used in the Commonwealth of Massa­chusetts, the following additional
code 248 CMR MUST be met:

(1). Exisiting chimneys shall be permitted to have their use continued
when a gas conversion burner is installed, and shall be equipped with a
manual reset device that will automatically shut off gas to the burner in the
event of a sustained back-draft.

(2)(a). For all side wall horizontally vented gas fueld equipment installed in
every dwelling, building or structure used in whole or part for residential
purposes, including those owned or operated by the Commonwealth and
where the side wall exhaust vent termination is less than seven (7) feet
above finsihed 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 fueled equipment, the
installing plumber or gasfitter 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. In addition, the
installing plumber or gasfitter shall observe that a battery operated or hard
wired carbon monoxide detector with an alarm is installed on each addi­tional level of the dwelling, building or structure served by the side wall hor­izontal vented gas fueled 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 fueld 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 th event that the requirements of this subdivision can not be met at
the time of completion of installation, the owner shall have a period of thirty
(30) days to comply with the above requirements; provided, however, that
during said thirty (30) day period, a battery operated carbon monoxide
detector with an alarm shall be installed.

2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon
monoxide detector as required in accordance with the above provisions
shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.

3. SIGNAGE. A metal or plastic identification plate shall be permanently
mounted to the exterior of the building at a minimum height of eight (8) feet
above grade directly in line with the exhaust vent terminal for the horizon­tally vented gas fueled heating appliance or equipment. The sign shall
read, in print size no less that one-half (1/2) inch in size, “GAS VENT

DIRECTLY BELOW, KEEP CLEAR OF ALL OBSTR UCTIONS”.

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 part for residential purposes.

requirements pursuant to Massachusetts

6

Lynx Model LX-85

A. NON-DIRECT VENT INSTALLATION

1. Air drawn horizontally from outdoors DIRECTLY through
an outside wall; one louvered opening near the floor and

one louvered opening near the ceiling, each opening with a
minimum FREE air passage area of 1 square inch per 4000
Btuh of total appliances’ input.

2. Air drawn horizontally through HORIZONTAL DUCTS; one
opening near the floor and one opening near the ceiling, each
opening with a minimum FREE air passage area of 1 square
inch per 2000 Btuh of total appliances’ input.

3. Air drawn VERTICALLY from outdoors; one opening at the
floor and one opening at the ceiling, each opening with a min­imum FREE air passage area of 1 square inch per 4000
Btuh of total appliances’ input.

4. Air drawn from inside the building; one opening near the
floor and one opening near the ceiling, each opening with a
minimum FREE air passage area of 1 square inch per 1000
Btuh of total appliances’ input.

IF BOILERS ARE INSTALLED ADJACENT TO OTHER FUEL
BURNING EQUIPMENT, THE AREA OF FREE OPENINGS
MUST BE APPROPRIATELY INCREASED TO ACCOMMODATE
THE ADDITIONAL LOAD.

B. DIRECT VENT INSTALLATION

Adequate air supply should be provided to prevent overheating of
the boiler controls and boiler room. Openings for passage of air
into the boiler room for direct-vent installation must be at least

1

⁄2 of
the openings required for the non-direct vent as
mentioned above.

If additional non-direct vent appliances are installed in the same
space and adequate air openings are provided for them, there are
no additional air openings required for the Lynx LX-85.

For both direct and non-direct installation, the following must be
considered:

- Openings must never be reduced or closed. If doors or

windows are used for air supply, they must be
locked open.

- Protect against closure of openings by snow and debris.

Inspect frequently.

- No mechanical draft exhaust or supply fans are to be

used in or near the boiler area.

- Boiler area must never be under negative pressure. The

flow of combustion and ventilating air to the boiler must
not be obstructed.

VENT AND AIR INTAKE MATERIALS

The vent piping for direct or non-direct vent installation must be
3” diameter PVC/CPVC schedule 40 pipe, or UL listed single
wall 3” diameter AL29-4C* stainless steel material. The air
intake piping for direct vent installation must be 3" diameter
PVC/CPVC schedule 40 pipe. The following manufacturers’
systems are approved for use within a specified minimum and
maximum equivalent vent length in this manual.

Manufacturer

Heat-Fab. Inc. Saf-T Vent Not Required

ProTech System, FasNSeal Not Required
Inc.

Flex-L StaR-34 GE-IS806
International, Inc.

Z-Flex, Inc. Z-Vent GE, RTV 106

N/A PVC pipe, PVC primer

N/A CPVC pipe, CPVC primer

*AL29-4C is a registered Trademark of Allegheny Ludlum Corp

Type/System

EZ Seal

Schedule 40 and cement

Schedule 40 and cement

Sealant

When joining the various components of the listed stainless
steel vent systems, the manufacturers’ instructions should be
closely followed to insure proper sealing. Use sealant specified
by vent system manufacturer for sealing of pipe and fittings, if
required. When joining the PVC/CPVC pipe and fittings, follow
the instructions provided in this manual. All connections must be
liquid and pressure tight. DO NOT use galvanized flue pipe or
any plastic-type materials other than PVC/CPVC Schedule 40.

The vent and air intake connections on the boiler are designed to
accommodate either PVC/CPVC Schedule 40 pipe or the listed
stainless steel vent systems (by inserting the optional adapter
specified in the Lynx LX-85 Parts List, publication # LX-10PL, for
stainless steel venting). Built-in sealing rings are provided, so no
additional sealant is required. The application of liquid soap to the
outer end of the vent pipe (or adapter, if used) will aid in installing
it. Make sure the pipes are round and burr-free, and push down
into the appropriate step of the connector or adapter, until snug.
(See Figure 5).

FLUE GAS VENTING REQUIREMENTS

The Lynx LX-85 series boiler is a high efficiency, mechanically
forced draft boiler and, therefore, requires different venting
arrangements than natural draft, lower efficiency boilers.

THE FOLLOWING INSTRUCTIONS MUST BE CAREFULLY
READ AND FOLLOWED IN ORDER TO AVOID ANY HAZ­ARDOUS CONDITIONS DUE TO IMPROPER INSTALLATION
OF THE AIR INTAKE AND FLUE GAS VENTING SYSTEM.

The vent piping installation MUST be in accordance with these
instructions and with ANSI Z223.1-latest edition NATIONAL FUEL
GAS CODE, Part 7, Venting of Equipment. Other local codes may
also apply and must be followed. Where there is a conflict
between these requirements, the more stringent case shall apply.
The use of a vent damper is NOT permitted on this boiler series.

AIR INTAKE PIPE
(PVC OR CPVC)

VENT PIPE
(PVC OR CPVC)

CHECK EDGE
FOR BURRS

FLUE AND AIR INTAKE
CONNECTOR

Figure 5. Vent and Air Intake Pipe installation into Boiler
vent and air intake connections.

Lynx Model LX-85

PVC/CPVC PIPE GENERAL ASSEMBLY METHOD

The following are the recommended methods for cutting,
cleaning and connecting PVC and CPVC pipe, for both the
vent and air intake piping system:

1. When laying out the piping system, work from the boiler

vent and air intake adapter to the point of outside
termination.

2. Cut the PVC/CPVC pipe to the required lengths, and

pre-assemble the entire system, before sealing.
Disassembly after sealing, to make any corrections, will not
be possible.

3. Once the pre-assembled PVC/CPVC pipe vent and air

intake system is verified to be of the proper length pipe and
fitting orientation, begin disassembling and preparing the
pipes and fittings for the sealing process. This can be done
section by section, or the complete vent and air intake
system can be disassembled. It is recommended to mark
the various parts, before complete disassembly, to
eliminate the possibility of errors during re-assembly.

4. De-burr the inside and outside of every PVC/CPVC pipe, to

ensure that they engage fully into the fittings, and flow is
not compromised. A small chamfer on the outside of each
pipe can particularly aid in the final assembly process.

5. Wipe or knock out any debris from inside the PVC or

CPVC pipe, which may have accumulated there from the
cutting process or storage. Debris can cause operational
problems with the boiler combustion components.

6. Thoroughly clean the outside ends of each pipe, and the

inside of each fitting. The surfaces must be dry for the
sealing agents to work properly. Handle the prepared pipe
lengths away from the cleaned ends, and handle the
cleaned fittings, from the outside, to avoid contamination.

7. Re-assembly of the PVC or CPVC pipe should be done in

sections, to avoid the primer and cement drying before the
parts are engaged.

8. For each joint, first apply a coat of primer to the outside

sealing surface of the pipe and the inside sealing surface of
each fitting. Use only the primer type that is specified for
either the PVC or CPVC pipe that is bing utilized.

9. Before the primer dries, apply a coat of cement over it. A

second coat of cement can be applied, if necessary, but
must be done quickly and in a manner that avoids
unnecessary build-up that would cause obstruction inside
the system. Use only the cement type that is specified for
either the PVC or CPVC pipe that is being utilized.

10. Before the cement dries, insert the pipe into the fitting. A

slight twisting motion while pushing the pipe into the fitting
will aid in distributing the cement evenly and ensuring the
parts fully engage.

11. Quickly wipe the excess cement from the outside areas of

the joint. Discard any rags used to avoid later getting the
cement on hands, clothes and equipment.

VENT AND AIR INTAKE RESTRICTIONS

1. Maximum allowed equivalent vent and air intake length for

all of the approved vent and air intake materials is 100
equivalent feet.

2. Equivalent of vent or air intake length is sum of the

straight pipe lengths and equivalent length of elbows as
shown in the table on this page.

7

Figure 6.

3. The vent termination is in addition to the allowed
equivalent lengths.

4. Minimum vent length is 2 feet of straight pipe, plus one
90˚ elbow that is required.

5. Vent length restriction is for both direct and non-direct
vent installations.

EXAMPLE: Boiler model LX-85 is to be installed. The
combustion air is provided by air intake piping directly to the
boiler (direct-vent installation). The vent piping will be PVC
and installation location will require the use of 4 elbows for
the vent to run the termination. The air intake piping will also
be PVC, and also will require the use of 4 elbows.

In this case, the maximum straight pipe vent length that can
be utilized with the 4 elbows would be: 100’ - (4’ x 5’) = 80’.
Since the air intake pipe also is PVC and requires the use of
4 elbows, the maximum straight pipe air intake length that
can be utilized is also 80 feet.

If the air for combustion were taken from the boiler room
(non-direct vent installation), still the maximum straight vent
length would be 80 feet.

Equivalent Length of Various 90-Degree Elbows

Manufacturer

Heat-Fab, Inc. Saf-T Standard 3

Heat-Fab, Inc. Saf-T, tight radius elbow 6
ProTech System, Inc. FasNseal 6

Flex-L International, Inc. StaR-34 6
Z-Flex, Inc. Z-Vent 6

N/A PVC, Schedule 40 5
N/A CPVC, Schedule 40 5

Type/System

elbow

Equivalent

Length (Feet)

8

Lynx Model LX-85

6. The LX-85 boiler is equipped with a built-in condensation
drain and trap. The trap must be filled with water. DO NOT
operate the boiler without filling the trap with water to
prevent flue gas discharge into space. The drain must
dispose of possibly large quantities of condensate, which
may require a neutralizing system. Refer to the “Condensate
Drainage” section of this manual. No additional condensa­tion drain and trap is required on the vent piping system
itself.

7. The horizontal vent pipe must be sloped upward from the
boiler at a pitch of at least 1/4” per 1 foot of run, so that
the condensate from the vent system runs to the boiler
vent adapter pipe, then out the built-in condensation drain
and trap.

8. The horizontal vent and air intake pipes must be supported

with pipe straps, at intervals no greater than 5 feet, when
PVC/CPVC pipe is utilized. This support spacing applies
also to stainless steel vent pipe, unless the manufacturer’s
instructions permit otherwise. The vertical vent and air
intake pipes also must be supported, wherever the building
construction provides allowance for it, such as ceiling or
roof passage openings where a firestop and support or
braces can be affixed.

9. Minimum clearances of vent pipes from combustible

constructions must be maintained (see Page 4). No
clearance is required between the vent and air intake pipes
of this boiler.

10. Common venting with other appliances or another Lynx

boiler is not allowed.

VENT TERMINATION LOCATION AND CLEARANCES

1. The venting system shall terminate at least 3 feet above
any forced air inlet located within 10 feet.

2. The venting system shall terminate at least 4 feet below,
4 feet horizontally from, or 1 foot above any door, window
or gravity air inlet into any building. The bottom of the vent
terminal or air intake terminal shall be at least 12 inches
above grade or the normal snow level whichever is
greater.

3. Through the wall vents shall not terminate over public
walkways or over areas where condensate or vapor could
create a nuisance or hazard or could be detrimental to
the operation of regulators, relief valves or other equip­ment. Minimum clearance of 4 feet horizontal distance is
maintained, from electric meters, gas meters, regulators
and relief equipment.

4. Vent termination must not be located in any confined
space (i.e. window wells, alcoves, narrow alleys) or under
any overhang or deck. Vent termination should not allow
flue gas discharge towards neighbor’s windows or where
personal injury or property damages can occur.

B. NON-DIRECT VENT - VERTICAL VENTING

Figure 9 shows typical venting through the roof. The vent pipe
must pass through the ceiling, floor and the roof vertically
through a 6" minimum diameter cutout. A fire stop is required
for each ceiling and floor penetration. For roof passage, an
appropriate UL listed roof flashing must be used.

11. DO NOT install a vent damper or similar devices in vent
system or on the boiler.

12. DO NOT insulate venting system.

VENTING INSTALLATION

Only the approved PVC/CPVC and stainless steel materials
listed on page 6 may be used for the venting system installa­tion. If stainless steel vent systems are used, follow the manu­facturer’s instructions, in conjunction with these instructions.

I. NON-DIRECT VENT INSTALLATION

The air for combustion is taken from the ambient air
surrounding the boiler; therefore, ample supply of air is required
for combustion and ventilation (see page 6.)

DO NOT use this installation method if the surrounding of the
boiler is contaminated. See page 5 for the list of harmful
contaminants and their sources, to avoid.

A. NON-DIRECT VENT SIDEWALL VENTING

Figures 7 and 8 show typical horizontal sidewall venting. For
combustible wall passage of vent piping, a UL listed thimble
or flashing and sealing boot must be used, providing the wall
thickness from 3" minimum up to 12" maximum. The vent
piping must terminate with a screened tee or elbow termination
facing down.

CAUTION: Flue gasses exiting from the vent terminal will
condense. Building materials in the area of the vent terminal
should be protected from discoloration and degradation.

An existing chimney (see Figure 10) may be used as a chase
for vertical venting. Other appliances CANNOT be vented into
the same chimney or vent pipe with in the chimney.

The vertical vent piping must terminate with a screened tee,
combination of 45˚ elbow and a 90˚ screened elbow termina­tion or a rain cap termination.

II. DIRECT VENT INSTALLATION

Air intake piping from outside to the boiler air intake connector
provides the air for combustion. The boiler surrounding may be
contaminated (See page 5). Piping the air intake to the outside
can prevent contaminants from the boiler surrounding from
entering the combustion air supply.

A. SIDEWALL DIRECT VENTING

Figures 11 and 12 show typical sidewall direct venting, using a
Slant/Fin vent/air intake termination. There are 2 different mod­els of vent/air intake termination available. One is designed
specifically for PVC/CPVC venting, and the other is designed
specifically for stainless steel venting systems. Only these 2
models of vent/air intake termination are approved for this
method of installation. Refer to the Slant/Fin Lynx LX-85 Parts
List (publication number LX-10PL) for the appropriate model for
the vent material to be used.

CAUTION: Flue gasses existing from the vent terminal will con­dense. Building materials in the area of the terminal should be
protected from discoloration and degradation, in addition to the
requirements of the vent termination location and clearances
stated in this manual.

Lynx Model LX-85

LYNX MODEL LX-85 NON-DIRECT VENT, SIDEWALL VENTING

All joints must be liquid and pressure tight. Use 3” dia. PVC/CPVC schedule 40 pipe or U/L listed single wall 3" dia.

9

AL29-4C S.S.*. venting materials (See page 6).

90˚ ELBOW

AIR INTAKE
(DO NOT BL0CK)

SLOPE UP 1/4 IN.
PER FOOT MIN.

FROM BOILER TO
VENT TERMINATION

3 IN. DIA.
PVC/CVPC
PIPE FOR
VENT

6" MIN.
9" MAX.

TERMINATION 90˚ ELBOW
WITH SCREEN

A U/L LISTED FLASHING
AND SEALING BOOT MUST
BE USED ON COMBUS TIBLE
WALLS.

OUTSIDE WALL

Figure 7. Non-direct vent, side wall venting - utilizing PVC/CPVC pipe f or venting.

6" MIN.
9" MAX.

OUTSIDE VENT TERMINATION
ELBOW WITH SCREEN

A U/L LISTED WALL THIMBLE
MUST BE USED ON COMBUSTIBLE
WALLS. S/F P/N 440695
(ADJUSTABLE 5 IN. TO 8 IN.)
MAY BE USED. ABOVE THIMBLE
MUST BE USED WITH HEAT-FAB
SLIP JOINT CONNECTOR

STANDARD
90

?

ELBOW

AIR INTAKE
(DO NOT BL0CK)

SLOPE UP 1/4 IN.
PER FOOT MIN.

FROM BOILER TO
VENT TERMINATION

3 INCH. DIA.
STAINLESS
STEEL VENTING
MATERIAL FOR
VENT

ADAPTOR

SNOW LINE

(SEE DEFINITION)

12" MIN

12" MIN

S/F P/N 440695 (ADJUSTABLE

Figure 8. Non-direct vent, side wall venting - utilizing stainless steel vent materials f or venting.

** Definition of Snow Line: Knowledge of local conditions will reveal the maximum height that repeated snowfalls accumulate to.
The height should be used as the SNOW LINE.

AL 29-4C IS A REGISTERED TRADEMARK OF ALLEGHENY LUDLUM CORP.

*

OUTSIDE WALL

SNOW LINE

(SEE DEFINITION)

10

Lynx Model LX-85

LYNX MODEL LX-85 NON-DIRECT VENT, VENTING THROUGH A ROOF

All joints must be liquid and pressure tight. Use 3” dia. PVC/CPVC schedule 40 pipe or U/L listed single wall 3" dia.

AL29-4C S.S.*. venting materials (See page 6).

90° TERMINATION

ALTERNATE VERTICAL TERMINATION

*

45° ELBOW

ELBOW WITH SCREEN

RAIN CAP TERMINATION MAY BE USED

*

FIRESTOP AND
SUPPORT

90° ELBOW

AIR INTAKE
(DO NOT BLOCK)

SLOPE UP 1/4 IN.

PER FOOT MIN.

10 FT MIN.

VENT TERMINATION
TEE WITH SCREEN

1 FT MIN.

FLASHING AND
STORM COLLAR

NIM "2

2" MIN

3 IN. DIA. PVC/CPVC
PIPE OR STAINLESS STEEL
VENTING MATERIAL FOR VENT

FIRESTOP AND
SUPPORT

96044 N/P F/S

ELBATSUJDA( 5

Figure 9. Lynx model LX-85 - non-direct vent, venting through the roof

AL 29-4C IS A REGISTERED TRADEMARK OF ALLEGHENY LUDLUM CORP.

*

USE ADAPTOR IF
STAINLESS STEEL
IS USED

3 IN. DIA. PVC/CPVC
PIPE OR STAINLESS STEEL
VENTING MATERI AL FOR VENT

Lynx Model LX-85

LYNX MODEL LX-85 NON - DIRECT VENT, UTILIZING AN EXISTING

All joints must be liquid and pressure tight. Use 3” dia. PVC/CPVC schedule 40 pipe or U/L listed single wall 3" dia.

*

CHIMNEY AS A CHASE

AL29-4C S.S.*. venting materials (See page 6).

ALTERNATE VERTICAL TERMINATION

*

45° ELBOW

RAIN CAP TERMINATION MAY BE USED

10 FT MIN.

CHIMNEY
TOP PLATE

90° TERMINATION
ELBOW WITH SCREEN

VENT TERMINATION
TEE WITH SCREEN

1 FT MIN.

11

SLOPE UP 1/4 IN.

PER FOOT MIN.

90° ELBOW

AIR INTAKE
(DO NOT BLOCK)

SEAL CHIMNEY OPENING

WITH MORTAR OR COVER PLATE

USE ADAPTOR IF
STAINLESS STEEL
IS USED

(

ELBATSUJ

596044 N/P F/S

DA

Figure 10. Lynx model LX-85 - non-direct vent, utilizing an existing chimney as a chase.

AL 29-4C IS A REGISTERED TRADEMARK OF ALLEGHENY LUDLUM CORP.

*

3 INCH DIA. PVC/CPVC
PIPE OR STAINLESS STEEL
VENTING MATERIAL FOR
VENT

3 INCH DIA. PVC/CPVC
PIPE OR ST AINLESS STEEL
VENTING MATERIAL FOR
VENT

12

Lynx Model LX-85

LYNX MODEL LX-85 - DIRECT VENT, SIDEWALL VENTING

All joints must be liquid and pressure tight. Use 3” dia. PVC/CPVC schedule 40 pipe or U/L listed single wall 3" dia.

AL29-4C S.S.*. venting materials (See page 6).

3 - 16" THICK WALL

3" DIA PVC/CPVC PIPE FOR AIR INTAKE

90° ELBOW

3" DIA PVC/CPVC PIPE FOR VENT

SLANT/FIN VENT/AIR INTAKE
TERMINATION KIT PART # 84 0802 000

12" MIN

AIR INTAKE LOUVERS

3" DIA PVC/CPVC COUPLING WTH SCREEN

SNOW LINE **
(SEE DEFINITION)

OUTSIDE WALL

Figure 11. Direct vent, sidewall venting illustration; utilizing PVC/CPVC pipe for venting

3 - 12" THICK WALL

3" DIA PVC/CPVC PIPE FOR AIR INTAKE

90° ELBOW

3" DIA STAINLESS STEEL
PIPE FOR VENT

ADAPTOR

SLANT/FIN VENT/AIR INTAKE
TERMINATION KIT PART # 84 0804 000

12" MIN

AIR INTAKE LOUVERS

3" DIA STRAIGHT SCREENED VENT TERMINATION

SNOW LINE **
(SEE DEFINITION)

OUTSIDE WALL

Figure 12. Direct vent, sidewall venting illustration; utilizing stainless steel vent materials f or venting.

** Definition of Snow Line: Knowledge of local conditions will reveal the maximum height that repeated snowfalls accumulate to.
The height should be used as the SNOW LINE.

AL 29-4C IS A REGISTERED TRADEMARK OF ALLEGHENY LUDLUM CORP.

*

Lynx Model LX-85

13

3" DIA PVC/CPVC PIPE FOR VENT

OUTSIDE TERMINATION PLATE

3" DIA PVC/CPVC COUPLING WITH SCREEN

INSIDE TERMINATION PLATE

3" DIA PVC/CPVC
PIPE FOR AIR INTAKE

SCREW

WALL
(3"-16" THICK)

3" DIA PVC/CPVC
PIPE FOR VENT

SCREW

STOP FOR AIR/VE NT
OUTSIDE TERMINAL

Figure 13a. Vent/Air intake termination; utilizing PVC/CPVC pipe for venting.

4" GALV. PIPE
(WALL THIMBLE - FOR
COMBUTIBLE WALLS
ONLY)

3" DIA AL29-4C S.S. VENT PIPE (SLIP JOINT CONNECTOR )

INSIDE TERMINATION PLATE

3" DIA PVC/CPVC
PIPE FOR AIR INTAKE

3" DIA AL29-4C S.S.

(SLIP JOINT CONNECTOR)

WALL
(3"-12" THICK)

FLUE
GAS

VENT PIPE

SCREW

3" DIA PVC/CPVC
PIPE FOR AIR INTAKE

INSIDE TERMINATION PLATE

AIR

SEAL HERE

OUTSIDE TERMINATION PLATE

3" DIA PVC/CPVC
COUPLING WITH SCREEN

FLUE
GAS

LOUVERS

3" DIA PVC/CPVC
PIPE FOR A IR INTAKE

AIR

WALL
(3"-16" THICK)

INSIDE TERMINATION
PLATE

WALL
(3"-12" THICK)

SCREW

STRAIGHT SCREENED TERMINATION

OUTSIDE TERMINATION PLATE

STRAIGHT SCREENED
TERMINATION

Figure 13b. Vent/Air intake termination; utilizing stainless steel venting materials.

SEAL HERE

LOUVERS

OUTSIDE TERMINATION PLATE

14

Lynx Model LX-85

VENT/AIR INTAKE TERMINATION FOR PVC/CPVC
VENTING INSTALLATION

This termination is designed specifically for 3” diameter PVC or
CPVC Schedule 40 pipe to be used as the vent and air intake
piping material, only. It can be used on a combustible wall,
provided the 1” minimum clearance of the vent pipe to any
combustible surface is maintained.

1. Termination must be installed horizontally.

2. Refer to Figure 13a for installation details.

3. Wall thickness should be 3” to 12” thick.

4. Follow instruction for “vent termination location and

clearances” explained on page 8.

5. Cut a rectangular opening with the following dimensions in

the wall.
Height: 5
Width: 12

1

⁄4”

3

⁄4”

6. From outside of the wall, install outside termination plate

using 4 screws. Make sure the louvers are at right side.
Seal the plate perimeter with silicon.

7. Apply a bead of silicon around the outer surface of the out

side termination plate air intake collar, about 1/2” from the
edge. This will seal the air intake pipe to the air intake
collar, in step #9.

8. From inside, install the inside termination plate, using 4

screws. Make sure that the holes for the vent and air intake
pipe visually line up with the vent passage hole and air
intake collar on the outside termination plate.

9. Cut the PVC or CPVC air intake pipe to the proper

dimension to fit onto the air intake collar of the terminal.
Slide the air intake pipe through the inside termination
plate and onto the air intake collar, where the sealant was
pre-applied in Step #7.

10. Cut the PVC or CPVC vent pipe so that it will extend out

at least 2" from the outside termination plate and 2" from
inside termination plate.

11. Cement a 3” diameter PVC or CPVC coupling onto the

PVC or CPVC vent pipe, and install the stainless steel
screen (supplied with the boiler) into the coupling.

VENT/AIR INTAKE TERMINATION FOR STAINLESS STEEL
VENTING INSTALLATION

This termination is designed specifically for the 3” diameter
stainless steel venting systems approved to be used as the
vent, and 3” diameter PVC or CPVC schedule 40 pipe to be
used as the air intake piping material, only. It can be used on a
combustible wall, provided a length of 4” diameter galvanized
pipe is installed as a thimble around the vent pipe, for the wall
passage.

1. Termination must be installed horizontally.

2. Refer to Figure 13b for installation details.

3. Wall thickness should be 3” to 12” thick.

4. Follow instruction for “vent termination location and
clearances” explained on page 8.

5. Cut a rectangular opening with the following dimensions in
the wall.
Height: 5
Width: 12

1

⁄4”

3

⁄4”

6. From outside of the wall, install outside termination plate
using 4 screws. Make sure the louvers are at right side.
Seal the plate perimeter with silicon.

7. Apply a bead of silicon around the outer surface of the
outside termination plate air intake collar, about 1/2” from
the edge. This will seal the air intake pipe to the air intake
collar, in step #11.

8. For combustible wall a 4” galvanized pipe must be used as
a wall thimble.The length of the 4” galvanized pipe should
be approximately 1” shorter than the wall thickness.

9. From inside the building, fit galvanized pipe over 4” collar of
the outside plate.

10. From inside, install inside termination plate using 4 screws.
Make sure the 4” collar on the plate, penetrated into the
galvanized pipe.

11. Cut the PVC or CPVC air intake pipe to the proper
dimension to fit onto the air intake collar of the terminal.
Slide the air intake pipe through the inside termination
plate and onto the air intake collar, where the sealant was
pre-applied in Step #7.

12. From outside the wall, insert the bare end of the PVC or
CPVC vent pipe through the outside and inside terminal
plates, until the coupling is flush with the outside wall plate.

13. From inside, proceed with the air intake and vent pipe
installation. Follow the proper PVC/CPVC assembly
practices specified on page 7 and venting system
restrictions specified on page 7 of this manual.

12. Assemble and seal straight screened termination to the slip
joint connector.

13. From outside of the building, insert vent pipe (slip joint
connector and termination assembly) through the 3” holes
of the outside and inside termination plate.

14. From inside, proceed with air intake and vent pipe
installation. Follow vent manufacturer’s instructions and
restrictions specified on page 7 of this manual.