Slant/Fin LX-90 Guide

Residential • Gas fired • Hot ater Boilers
User’s Information Manual
ynx Direct-Vent Sealed Combustion Condensing Boiler
Model X-90, X-120, X-150
FOR YOUR SAFETY:
• Before operating this boiler, READ this manual.
• DO NOT attempt to install, service or repair this boiler yourself. There are no user serviceable
parts. Contact a qualified service agency if your boiler needs repair or maintenance. Ask your gas supplier for a
list of qualified service agencies.
• A qualified service agency should inspect the venting system of this boiler on an annual basis.
__ DO NOT store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
__ WHAT TO DO IF YOU SME GAS
• DO NOT try to light any appliance.
• DO NOT touch any electrical switch
• DO NOT use any phone in your building.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier,
call the fire department.
__ Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
WARNING: If the information in this manual is
not followed exactly, a fire or explosion may
result causing property damage, personal
injury or loss of life.
Your gas boiler must be installed and serviced by a qualified service agency or
gas supplier. The lack of proper service can result in a dangerous condition.
This manual must be left with owner, hung on or
adjacent to the boiler. Owner should retain manual
for future reference.
Printed in U.S.A. 1111 Part No. 81-5002 Publication No. X1-UIM Rev.A

Lynx 2
WELCOME TO OUR VALUED CUSTOMER
Y u are n w the wner f a Slant/Fin Lynx gas-fired b iler,
an ther quality heating pr duct designed and manufactured
by an industry leader, t pr vide y ur family with many years
f reliable c mf rt and tr uble-free perf rmance.
The care and maintenance f y ur new b iler is imp rtant t
prevent a hazard us c nditi n which might result f rm lack
f pr per servicing. Theref re, y u sh uld perf rm regular
“ wner” inspecti ns as described in this manual (and rep rt
any c ncerns t a qualified service technician) as well as
have y ur b iler serviced by a qualified service technician at
least nce a year, preferably bef re the beginning f each
heating seas n.
LIGHTING INSTRUCTIONS
L cate, read and then f ll w the pr cedures n the lighting
instructi ns label attached t the b iler. F r reference, we
have repr duced th se instructi ns in this manual.
DO NOT use this boiler if any part has been
underwater. 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 underwater.
WARNING
Should overheating occur or the gas supply
fail to shut off, DO NOT turn off or disconnect
the electric supply to the circulator pump.
Instead, shut off the gas supply at a location
EXTERNA to the appliance.
WARNING
S ANT/FIN DOES NOT PERMIT THE USE OF
VENT DAMPERS ON YNX BOI ER. OTHER
DAMPERS OR DEVICES WITH SIMI AR PUR-
POSE ARE NOT
PERMITTED.
Keep the b iler area clean and free f all materials that can burn.
NEVER close or reduce openings that supply air f r the b iler fire and f r ventilati n.
Figure 1. Location and identification of parts.
"A" "B" "C" "D"
M
16 1/4
L6 5/8 3 3/8 2 16 1/4
L6 3/8 3 3/4 2 3/4 19
33
35
22
LEFT SIDE FRONT RIGHT SIDE
5
"D"
"A"
"B"
"C"
BOILER "A" "B" "C" "D"
MODEL
LX-90 6 3/4 3 3/8 2 3/4 16 1/4
LX-120 6 5/8 3 3/8 2 16 1/4
LX-150 6 3/8 3 3/4 2 3/4 19
3
FRONT RIGHT SIDE
5

Lynx
3
INSPECTION
Your boiler and heating system will last an indefinitely long
time at full efficiency, if it is inspected regularly and is kept
in good repair and adjustment. You, the user, should make
regular inspections, and report any problems to your
service agency. At regular intervals, you should have that
agency inspect the system and make repair adjustments as
necessary. What you and the service agency should do is
listed below. Contact your gas supplier for a list of qualified
service and repair agencies.
USER INSPECTION
The user should make the following inspections at least
once each month during the heating season and once just
before cold weather starts. ynx boiler may be installed
and vented either as direct-vent boiler, which all air for
combustion is obtained directly from outside through the
air intake piping or as non-direct-vent boiler, which all air
for combustion is taken from inside the boiler room. Typical
direct-vent installations are shown on Figures 2 and 3.
Non-direct-vent installation is shown on Figures 4, 5 and
6.
1. VENTING AND AIR INTAKE SYSTEM REGU AR
INSPECTION
Inspect the system regularly for condensation, corrosion,
sagging and/or physical damage. A qualified professional
should service the boiler annually and include such an
inspection at that time. The homeowner should look over the
system monthly for damage, water stains, any signs of rust,
other corrosions or separation of the vent and air intake
piping (if direct-vent).
Should an inspection turn up signs of condensation,
corrosion, sagging or damage, the boiler should be shut
down immediately and the condition should be corrected by
a qualified professional.
If the boiler is vented horizontally through the wall, the
outside termination, louvers and screen should be checked
for any debris blocking the opening and cleaned as
required.
Figure 2. Direct vent, sidewall venting illustration. Figure 3. Direct vent, venting and air intake
through a roof.

Lynx 4
Figure 4. Non-direct vent, sidewall venting.

Lynx
5
Figure 5. Non-direct vent, venting through the roof.
Figure 6. Non-direct vent, utilizing an existing chimney as a chase.

Lynx 6
2. CONDENSATE REMOVA SYSTEM
ynx boilers are 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. Periodic
inspection should be made of this assembly for deterio-
ration of the tubing and to insure that the trap is not
plugged. If it is plugged or appears to have excessive
sediment in it, it should be removed from the drain
assembly, straightened out to clear the obstruction,
reformed, filled with water and reinstalled as before.
(See Figure 7).
eave the top of the condensate drain tee open, to act
as a vacuum breaker. Do not allow any part of the
condensate removal system to be exposed to freezing
temperatures, or any other conditions that could cause
blockage.
If a neutralizing system is installed, the filter medium will
require periodic changing, to ensure it’s effectiveness.
Refer to the neutralizing unit’s manufacturers instruc-
tions, if available, or change the medium on an annual
basis.
3. PIPING INSPECTION
ook at all water piping. There should be no leaks or
signs of leaks at any pipe joints or around the boiler.
4. SYSTEM WATER PRESSURE INSPECTION
The boiler water pressure is indicated on the pressure
gage (See Figure 1 for location). The boiler water outlet
temperature is normally indicated on the temperature
display (See Figure 1 for location and Figure 9 for digits
illustration). For most installations, it should indicate
about 12 to 15 psi pressure when temperature is about
70 to 100F and from 15 psi to 25 psi when temperature
is up to 195˚F. FOR YOUR SYSTEM, there is one
correct pressure for each temperature. ASK YOUR
INSTA ER OR SERVICEPERSON TO EXP AIN AND
SHOW YOU. earn what normal pressure to look for. If
pressure increases from normal, the relief valve will
open to relieve the pressure. Call your service organiza-
tion if pressures are higher or lower than normal, and if
the relief valve spills water. Repair or adjustment is
needed.
5. UNUSUA NOISE
Stand near the boiler and look and listen. As the burner
start and shut off, there should be no unusual noise.
6. BOI ER ROOM AIR SUPP Y
Ample boiler room fresh air is required for combustion
(non-direct vent installation) and ventilation (direct-vent
installation).
Check air vents for continues positive supply of air as
required. Air needs are greatest in cold weather if boiler
installation is non-direct vent method. Air vents must be
open and free of obstruction.
Warning: The flow of combustion and ventilating air to the
boiler should not be obstructed.
Warning: If you find any problem during your inspection, call
for service immediately.
Figure 7. Condensate disposal system

Lynx
7
The combustion air supply must not be susceptible to
contaminants, which may 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 which must be avoided from
being stored or entering the boiler room or air supply
area:
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.
ANNUA SERVICE AND GENERA MAINTENANCE
A trained and qualified service technician should
perform inspection and general maintenance listed in
Installation and Operating Instructions (Publication No.
X1-40) before each heating season and at regular
intervals.
SAFETY AND OPERATING INSTRUCTIONS
Follow the lighting instructions in this manual. These
instructions are also attached to the boiler.
SAFETY INFORMATION
For Your Safety Read Before Operating
A. This appliance does not have a pilot. It is equipped with
an ignition device which automatically lights the burner.
Do not try to light the burner by hand.
B. BEFORE OPERATING smell all around the appliance
area for gas. Be sure to smell next to the floor because
some gas is heavier than air and will settle on the floor.
HAT 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 turn the gas supply shut off
valve. Never use tools. If the supply shut off will not turn
by hand, don’t try to repair it, call a qualified service
technician. Force or attempted repair may result in a
fire or explosion.
D. DO NOT use this appliance if any part has been under
water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the
control system and any gas control which has been
under water.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance is equipped with an ignition device
which automatically lights the burner. Do not try to light
the burner by hand.
5. Open the gas supply shut off valve, by turning the
handle to be parallel to the gas piping. (See Figure 8).
6. Wait five (5) minutes (longer for propane) to clear out
any gas, then smell for gas, including near the floor. If
you then smell gas, STOP! Follow “B” in the safety
information above on this page. If you don’t smell gas,
go to next step.
7. Turn on all electric power to the appliance.
8. Set thermostat to desired setting.
If the appliance will not operate, follow the instructions
“To Turn Off Gas to Appliance” and call your service
technician or gas supplier.
To Turn Off Gas to Appliance
1. Set thermostat to lowest setting.
2. Turn off all electric power to the appliance if service
is to be performed.
3. Close the gas supply shut off valve, by turning the
handle to be perpendicular to the gas piping.
(See Figure 8).
WARNING: If you do not follow these instructions exactly, a
fire or explosion may result causing property damage,
personal injury or loss of life.
GAS SUPPLY SHUTOFF VALVE
IN “OPEN” POSITION
GAS SUPPLY SHUTOFF VALVE
IN “CLOSED” POSITION
TURN 90˚
TO CLOSE
TURN 90˚
TO OPEN
Figure 8.

Lynx 8
Removing Jacket Front Panel
1. Turn black screws 1⁄4turn to open position.
2. Remove front panel.
To replace the panel, reverse procedure.
INTEGRATED BOI ER CONTRO
The integrated boiler control monitors the status of the
room thermostat, high limit switch, low water cutoff (if
installed), water inlet and outlet sensors, flue gas sensor
and flame sensor. It controls the operation of the circula-
tor, combustion blower, gas valve and spark ignitor. The
boiler control also determines the sequence of operation
and timing for pre and post purge periods, trial for ignition
and lock out.
The control display board provides information on boiler
operation on a mode and temperature display and can be
viewed, programmed and reset with specific push buttons.
Diagnostic information is also provided on the display, to
help determine the cause of boiler failure. (See Figure 9).
BOI ER CONTRO AND DISP AY FEATURES
(See Figure 9)
A. BOI ER OPERATION STATUS: “Mode Display”
shows status of boiler operation. (See Table 1).
B. VIEW AND CHANGING TEMPERATURES: Setting
boiler supply water temperature and water tank
temperatures (See Table 2).
Press “Select” button for viewing following different
modes on “Mode Display”
1. While “c” is blinking, boiler supply water
temperature for space heating may be set to
desired temperature. The setting range is between
90˚ to 185˚F.
2. While “d” is blinking, boiler supply water tempera-
ture for DHW may be set to desired temperature.
The setting range is between 104˚ to 185˚F.
3. While “t” is blinking, DHW tank temperature may be
set to desired temperature (if tank is equipped with
sensor). The setting range is between 104˚ to 185˚F.
4. View actual following temperatures on
“Temperature Display”, Press “Select” button
for selection:
a. Supply water temperature – Select #1 on
“Mode Display”.
b. Return water temperature – Select #2 on
“Mode Display”.
c. Domestic hot water tank temperature (if tank
equipped with sensor) – Select #3 on
“Mode Display”.
d. Flue gas temperature – Select #4 on
“Mode Display”.
e. Outside temperature (if outside sensor is used)
– Select #5 on “Mode Display”.
C. Display Board Pushbuttons:
1. Reset - Used to clear a ockout Error
(indicated with an “A” in the “Mode Display”)
2. Select - Used to scroll through the modes in the
“View and Changing Temperatures” and
“Viewing and Changing System Setting” menus.
3. Enter - Used to store values that are changed in
the “View and Changing Temperatures” and
“Viewing and Changing System Setting” menus.
4. Up - Used to increase values in the “View and
Changing Temperatures” and “Viewing and
Changing System Setting” menus.
5. Down - Used to decrease values in the “View and
Changing Temperatures” and “Viewing and
Changing System Setting” menus.
“MODE”
DISPLAY
“BURNER STATUS”
STEADY DOT = BURNER ON
BLINKING DOT = BURNER OFF
MODE
“TEMPERATURE”
DISPLAY
(3 DIGITS)
TEMPERATURE
“UP”
PUSH BUTTON
“DOWN”
PUSH BUTTON
“ENTER”
PUSH BUTTON
“SELECT”
PUSH BUTTON
“RESET”
PUSH BUTTON
RESET SELECT ENTER
Figure 9. Display Board

Lynx
9
Mode
Display Description & Temperature Display
Boiler is on stand-by mode.
Temperature display shows supply water Temp.
Space heating mode.
Temperature display shows supply water Temp.
Domestic hot water mode.
Temperature display shows supply waterTemp.
Frost protection mode.**
Temperature display shows supply water Temp.
ockout (Alarm) condition.
Temperature Display indicates the lockout code
Reset button must be pressed to resume normal operation.
Error Condition. *
Temperature display indicates the error code.
Warning Condition. ***
Temperature display indicates the error code.
ynx Boiler Display Board
“Boiler Operation Status”
Note:
Blinking dot on “Mode Display” indicates active heating control, burner off. Steady dot
indicates burner is on.
*: Error must be corrected to resume boiler operation. Pressing the “Reset” button is not
required.
**: The boiler circulator is energized, when boiler water temperature drops below 50˚F.
***: Error must be corrected to resume DHW operation. Space heating not affected.
Pressing the “Reset” button is not required.
Table 1

Lynx 10
Mode
Display Description & Temperature Display
Space heating supply water temperature could be
changed by pressing “Up/Down” button. Settable from
90˚F to 185˚F (steps of 1 F). The default valve is 176˚ F
Press “Enter” button to store. (see note 1)
Domestic hot water supply temperature could be changed
by pressing “Up/Down” button. Settable from
104˚F to 185˚F (steps of 1 F). The default valve is 176˚ F
Press “Enter” button to store.
(see note 2)
Domestic hot water tank temperature could be changed by
pressing “Up/Down” button. Settable from 104˚F to 160˚F
(steps of 1 F). The default valve is 140˚ F.
Press “Enter” button to store. (see note 3)
Temperature display shows actual
supply water temperature.
Temperature display shows actual
return water temperature.
Temperature display shows actual DHW tank temperature.
(if the water tank is equipped with sensor)
Temperature display shows actual flue gas temperature.
Temperature display shows actual outside temperature.
(boilers with outdoor sensor)
Table 2: Viewing and Changing Temperatures
Press “Select” button for viewing different modes on “Mode Display”
Notes:
1. For space heating mode “0” (boilers not utilizing outdoor sensor)
2. For DHW mode “2” (storage tank with Aquastat)
3. For DHW mode “1” (storage tank with sensor)
Table 2
Blinking
Blinking
Blinking

Lynx
11
DIAGNOSTIC ERROR CODES
WARNING:
If an operational problem has occurred, the boiler will
shut off and show an “A”, “E” or “H” in the mode display,
along with an error code in the temperature display.
Do not attempt performing any service under these
conditions, but do note the mode and temperature dis-
play indication, in case the problem clears itself. An “A”
indication error can be cleared by pressing the reset
button once, which will allow re-try of operation. Do not
repeatedly press the reset button in this case, or if an
“E” or “H” indication error is displayed. Call a trained,
experienced service technician to troubleshoot and cor-
rect the problem. The ynx Installation and Operating
Instructions, publication X1-40 contain a full trou-
bleshooting section for this. Turn off all electric power ot
the boiler before service.
A. OCKOUT ERRORS:
Indicated by an “A” in the mode display. The reset
button must be pressed to clear the error and retry
operation. The temperature display shows the error
code.
B. B OCKING ERRORS:
Indicated by an “E” in the mode display. Operation is
automatically restored, once the condition returns to
normal or is fixed. The temperature display shows
the error code. Pressing the “Reset” button is not
required.
C. WARNING ERRORS:
Indicated by an “H” in the mode display. Operation
of the space heating mode is not affected, and the
warning is displayed intermittently. Operation of the
DHW mode is automatically restored, once the
condition is fixed. The temperature display shows
the error code. Pressing the “Reset” button is
not required.
ERROR
CODE INDICATION
01 Ignition Failure - 3 unsuccessful ignition
attempts in a row
02 Flame Failure - 3 losses of flame signal
during one demand
03 Water High imit Open
04, 05, 09,
10, 12, 13,
14, 15, 16,
18, 32
Control Failure
19, 20 Flame Detected at Wrong Time
33 Fan Failure - RPM Error
ERROR
CODE INDICATION
01 Water Outlet Sensor Open
02 Water Inlet Sensor Open
03 Flue Gas Sensor Open
11 Water Outlet Sensor Shorted
12 Water Inlet Sensor Shorted
13 Flue Gas Sensor Shorted
19, 42,
45, 46,
47, 48
Control Failure
20 Flame Detected at Wrong Time
21 Polarity Error
22 Frequency Error
24 Earth Connection Faulty
30 Excess Flue Temperature
31 ow Water Cutoff Error
32 Excess Water Inlet Temperature
51 Reset Button Error
52 Boiler Model Selection Error
ERROR
CODE INDICATION
04 Domestic Hot Water Tank Sensor Open
14 Domestic Hot Water Tank Sensor Shorted

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©Slant/Fin Corp. 2011