Lochinvar Sync Condensing Boiler 1.3 User manual

Installation & Operation Manual
Models: 1.0 - 1.3 - 1.5
This manual must only be used by
a qualified heating installer / service
technician. Read all instructions,
including this manual and the SYNC
Service Manual, before installing.
Perform steps in the order given.
Failure to comply could result in
severe personal injury, death, or
substantial property damage.
WARNING
Save this manual for future reference.
SYNC-I-O Rev I

2
Contents
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or
to important information concerning the life of the product.
DANGER
WARNING
CAUTION
CAUTION
NOTICE
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not
related to personal injury or property damage.
HAZARD DEFINITIONS .................................................... 2
PLEASE READ BEFORE PROCEEDING ........................ 3
THE SYNC -- HOW IT WORKS...................................... 4-5
RATINGS........................................................................... 6
1. DETERMINE BOILER LOCATION
Closet and Alcove Installations.......................................... 7
Provide Air Openings to Room .......................................... 9
Flooring and Foundation................................................... 9
Vent and Air Piping............................................................ 9
Prevent Combustion Air Contamination............................. 9
Using an Existing Vent System to Install a New Boiler ... 10
Corrosive Contaminants and Sources............................. 10
Removing a Boiler from Existing Common Vent.............. 11
Remove Boiler from Wood Pallet..................................... 11
Combustion and Ventilation Air Requirements........... 12-13
2. GENERAL VENTING
Direct Venting Options - Sdwl/Horz. Vent Opt. Rm Air.... 14
Direct Venting Options - Vert. Vent Opt. Rm Air...............15
Direct Venting Options - Vert. Vent, Horz. Air ................. 16
Install Vent and Combustion Air Piping ........................... 17
PVC / CPVC Vent Piping Materials............................ 17
PVC/CPVC Air Intake/Vent Connections......................... 18
Air Inlet Pipe Materials................................................ 18
Requirements for Installation in Canada.......................... 19
Installing Vent and Air Piping........................................... 19
Stainless Steel Vent and Air Piping................................. 20
Min./Max. Combustion Air & Vent Piping Lengths........... 21
Vent and Air Piping.......................................................... 21
3. SIDEWALL DIRECT VENTING
Vent/Air Termination - Sidewall................................... 22-25
Determine Location................................................ 22-24
Prepare Wall Penetrations.......................................... 24
Termination and Fittings............................................. 25
Multiple Vent/Air Terminations.................................... 25
4. VERTICAL DIRECT VENTING
Vent/Air Termination - Vertical.................................... 26-27
Determine Location..................................................... 26
Prepare Roof Penetrations......................................... 26
Termination and Fittings........................................ 26-27
Multiple Vent/Air Terminations.................................... 27
Room Air .......................................................................... 27
5. HYDRONIC PIPING
System Water Piping Methods......................................... 28
Low Water Cutoff Device................................................. 28
Chilled Water System....................................................... 28
Freeze Protection............................................................. 28
General Piping Information .............................................. 28
Circulator Sizing............................................................... 29
Near Boiler Piping Connections....................................... 29
Near Boiler Piping Components.................................. 31-33
6. GAS CONNECTIONS
Connecting Gas Supply Piping........................................ 34
Natural Gas...................................................................... 35
Pipe Sizing for Natural Gas........................................ 35
Natural Gas Supply Pressure Requirements ............. 35
Propane Gas.................................................................... 35
Pipe Sizing for Propane Gas...................................... 35
Propane Supply Pressure Requirements................... 35
Check Inlet Gas Supply .............................................. 36-37
Gas Pressure ................................................................... 37
Gas Valve Replacement .................................................. 37
7. FIELD WIRING
Line Voltage Connections................................................ 38
Low Voltage Connections ................................................ 39
Wiring of the Cascade...................................................... 40
8. CONDENSATE DISPOSAL
Condensate Drain............................................................ 42
9. STARTUP ............................................................... 43-48
10. OPERATING INFORMATION
General........................................................................ 49-51
Cascade...................................................................... 51-52
Sequence of Operation.................................................... 53
Status Screen.............................................................. 54-55
Main Screen..................................................................... 56
11. MAINTENANCE
Maintenance & Annual Startup.............................. 57-62
12. DIAGRAMS
Ladder Diagrams................................................... 63-64
Wiring Diagram........................................................... 65
Revision Notes.................................................. Back Cover

Installation & Operation Manual
Please read before proceeding
Installer – Read all instructions, including
this manual and the SYNC Service
Manual, before installing. Perform steps
in the order given.
User – This manual is for use only
by a qualified heating installer/
service technician. Refer to the User’s
Information Manual for your reference.
Have this boiler serviced/inspected by
a qualified service technician, at least
annually.
Failure to comply with the above could
result in severe personal injury, death or
substantial property damage.
Failure to adhere to the guidelines on this
page can result in severe personal injury,
death, or substantial property damage.
When servicing boiler –
• To avoid electric shock, disconnect electrical supply
before performing maintenance.
• To avoid severe burns, allow boiler to cool before
performing maintenance.
Boiler operation –
• Do not block flow of combustion or ventilation air to
the boiler.
• Should overheating occur or gas supply fail to shut off,
do not turn off or disconnect electrical supply to
circulator. Instead, shut off the gas supply at a location
external to the appliance.
• Do not use this boiler if any part has been under water.
The possible damage to a flooded appliance can be
extensive and present numerous safety hazards. Any
appliance that has been under water must be replaced.
Boiler water –
• Thoroughly flush the system (without boiler
connected) to remove sediment. The high-efficiency
heat exchanger can be damaged by build-up or
corrosion due to sediment.
• Do not use petroleum-based cleaning or sealing
compounds in the boiler system. Gaskets and seals in
the system may be damaged. This can result in
substantial property damage.
• Do not use “homemade cures” or “boiler patent
medicines”. Serious damage to the boiler, personnel,
and/or property may result.
• Continual fresh make-up water will reduce boiler life.
Mineral buildup in the heat exchanger reduces heat
transfer, overheats the stainless steel heat exchanger,
and causes failure. Addition of oxygen carried in by
makeup water can cause internal corrosion in system
components. Leaks in boiler or piping must be repaired
at once to prevent the need for makeup water.
Freeze protection fluids –
• NEVER use automotive antifreeze. Use only inhibited
propylene glycol solutions, which are specifically
formulated for hydronic systems. Ethylene glycol is
toxic and can attack gaskets and seals used in hydronic
systems.
When calling or writing about the boiler
– Please have the boiler model and serial
number from the boiler rating plate.
Consider piping and installation when
determining boiler location.
Any claims for damage or shortage in
shipment must be filed immediately
against the transportation company by
the consignee.
Factory warranty (shipped with unit) does
not apply to units improperly installed or
improperly operated.
3
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.
This appliance MUST NOT be installed in
any location where gasoline or flammable
vapors are likely to be present.
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 near by 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
NOTICE
WARNING
WARNING

Installation & Operation Manual
4
The SYNC - How it works...
1. Access cover - front
Provides access to the gas train and the heat exchanger.
2. Air intake adapter
Allows for the connection of the PVC air intake pipe to the
boiler.
3. Air pressure switches
The air pressure switches detect blocked flue/vent conditions.
4. Air shrouds (1.0 Model only)
The air shrouds control air and gas flow into the burners.
5. Automatic air vents
Designed to remove trapped air from the heat exchanger
coils.
6. Blowers
The blowers pull in air and gas through the venturis (item
35). Air and gas mix inside the blowers and are pushed into the
burners, where they burn inside the combustion chamber.
7. Boiler drain port
Location from which the heat exchangers can be drained.
8. Boiler inlet temperature sensors
These sensors monitor system return water temperature. If
selected as the controlling sensor, the control
module adjusts the boiler firing rate so the inlet temperature
matches the set point.
9. Boiler outlet temperature sensors
These sensors monitor boiler outlet water temperature. If
selected as the controlling sensor, the control
module adjusts boiler firing rate so the outlet temperature
matches the set point.
10. Burners (not shown)
Made with metal fiber and stainless steel construction,
the burners use pre-mixed air and gas and provide a
wide range of firing rates.
11. Condensate drain connection
Connects the condensate drain line to a 1/2" PVC union.
12. Control modules
The control modules respond to internal and external signals
and control the blowers, gas valves, and pumps to meet the
heating demand.
13. Electronic display
Digital controls with touch screen technology and full color
display.
14. Flame inspection windows
The quartz glass windows provide a view of the burner
surfaces and flames.
15. Flame sensors
Used by the control module to detect the presence of burner
flame.
16. Flap valves
Prevents recirculation of flue products when only one burner is
running.
17. Flue gas sensors
These sensors monitor the flue gas exit temperature. The
control modules will modulate and shut down the boiler if the
flue gas temperature gets too hot. This protects the flue pipe
from overheating.
18. Flue pipe adapter
Allows for the connection of the PVC vent pipe system to the
boiler.
19. Gas connection pipe
Threaded 1½" pipe connection. This pipe should be
connected to the incoming gas supply for the purpose of
delivering gas to the boiler.
20. Gas shutoff valves (inside unit)
Manual valves used to isolate the gas valves from the burners.
21. Gas shutoff valve (outside unit)
Manual valve used to isolate the gas valve from the gas supply.
22. Gas valves
The gas valves sense the negative pressure created by the
blowers, allowing gas to flow only if the gas valves are
powered and combustion air is flowing.
23. Heat exchanger access covers
Allows access to the combustion side of the heat
exchanger coils.
24. High gas pressure switches
Switches provided to detect excessive gas pressure.
25. High limits
Devices used to monitor the outlet water temperature. If the
temperature exceeds its setting, they will break the control
circuit, shutting the boiler down.
26. Ignition electrodes
Provides direct spark for igniting the burners.
27. Line voltage junction box
The junction box contains the connection points for the line
voltage power and all pumps.
28. Line voltage wiring connections (knockouts)
Conduit connection points for the high voltage junction box.
29. Low gas pressure switch
Switch provided to detect low gas pressure.
30. Low voltage connection board
The connection board is used to connect external low voltage
devices.
31. Low voltage wiring connections (knockouts)
Conduit connection points for the low voltage connection board.
32. Low water cutoff device (LWCO)
Device used to ensure adequate water is supplied to the boiler
and in the event of inadequate water levels, will ensure the boiler
will shut down.
33. Power switch
Turns 120 VAC ON/OFF to the boiler.
34. Pump relay boards
The pump relay boards are used to connect the boiler, system
and Hot Water Generator (HW) pumps.
35. Relief valve
Protects the heat exchangers from an over pressure condition.
The relief valve will be set at 50 PSI.
36. Reset switch
Reset switch for the low water cutoff. Hold for 10 seconds to
reset.
37. Stainless steel heat exchangers
Allows system water to flow through specially designed coils for
maximum heat transfer, while providing protection against flue
gas corrosion. The coils are encased in a jacket that contains the
combustion process.
38. Temperature and pressure gauge
Monitors the outlet temperature of the boiler as well as the
system water pressure.
39. Test switch
Test switch for the low water cutoff. Hold for 10 seconds to
test.
40. Top panel
Removable panel to gain access to the internal components.
41. Venturis
The venturis control air and gas flow into the burners.
42. Water inlets
Two 2" NPT water connections that return water from the
system to the heat exchangers.
43. Water outlets
A 2½" NPT water connection that supplies hot water to the
system.
44. O-temp switch (located underneath access cover)
Used to detect excessive temperatures on the upper coil of the heat
exchanger.

Installation & Operation Manual
22
43
8
9
7
41
33
36
39
37
24
32
2
22
4
1.0 Model Only
25
20
Left Side (inside unit) 6
23
5
26
14
24
15
29
Right Side (inside unit)
The SYNC - How it works... (continued)
5
Models 1.0 - 1.3 - 1.5
40
13
1
12
31
28
17
19
42
27
30
34
3
2
18
21
11 35
38
16
44
Front View Rear View

6
Installation & Operation Manual
Ratings
SYNC
I=B=R Rating
Model Number
Note: Change “N” to
“L” for L.P. gas models.
Input
MBH
(Note 4)
Min Max
Gross
Output
MBH
(Note 1)
Net
I=B=R
Ratings
Water,
MBH
(Note 2)
SBN1000 100 1000 941 818
SBN1300 130 1300 1237 1076
SBN1500 150 1500 1444 1256
Other Specifications
Appliance
Water
Content
Gallons
Outlet
Water Inlet Water Gas Connections
Air
Size
Vent
Size
(Note 3)
8.4 2½" (2) - 2" 1½" 6" 6"
10.0 2½" (2) - 2" 1½" 6" 6"
11.4 2½" (2) - 2" 1½" 6" 6"
Maximum allowed working pressure is located on the rating plate.
NOTICE
Notes:
1. The ratings are based on standard test procedures
prescribed by the United States Department of Energy.
2. Net I=B=R ratings are based on net installed radiation of
sufficient quantity for the requirements of the building
and nothing need be added for normal piping and
pickup. Ratings are based on a piping and pickup
allowance of 1.15.
3. SYNC boilers require special gas venting. Use only
the vent materials and methods specified in the SYNC
Installation and Operation Manual.
4. Standard SYNC boilers are equipped to operate from sea
level to 4,500 feet only with no adjustments. The boiler
will de-rate by 4% for each 1,000 feet above sea level up
to 4,500 feet.
5. High altitude SYNC boilers are equipped to operate
from 3,000 to 12,000 feet only with no field adjustments.
The boiler will de-rate by 2% for each 1,000 feet above
3,000 feet. High altitude models are manufactured with
a different control module for altitude operation, but
the operation given in this manual remains the same as
the standard boilers. A high altitude label (as shown in
FIG. A) is also affixed to the unit.
6. Ratings have been confirmed by the Hydronics Institute,
Section of AHRI.
UNIT EQUIPPED FOR
3,000 FT. TO 12,000 FT.
HIGH ALTITUDE
Figure A High Altitude Label Location

7
Installation & Operation Manual
Installation must comply with:
• Local, state, provincial, and national codes, laws,
regulations, and ordinances.
• National Fuel Gas Code, ANSI Z223.1 – latest edition.
• Standard for Controls and Safety Devices for Automatically
Fired Boilers, ANSI/ASME CSD-1, when required.
• National Electrical Code.
• For Canada only: B149.1 Installation Code, CSA C22.1
Canadian Electrical Code Part 1 and any local codes.
WARNING This appliance is certified as an indoor
appliance. Do not install the appliance
outdoors or locate where the appliance will
be exposed to freezing temperatures or to
temperatures that exceed 100°F (37.8°C).
Failure to install the appliance indoors
could result in severe personal injury,
death, or substantial property damage.
1 Determine boiler location
The SYNC gas manifold and controls
met safe lighting and other performance
criteria when the boiler underwent tests
specified in ANSI Z21.13 – latest edition.
Before locating the boiler, check:
1. Check for nearby connection to:
• System water piping
• Venting connections
• Gas supply piping
• Electrical power
2. Locate the appliance so that if water connections should
leak, water damage will not occur. When such locations
cannot be avoided, it is recommended that a suitable
drain pan, adequately drained, be installed under the
appliance. The pan must not restrict combustion air
flow. Under no circumstances is the manufacturer to be
held responsible for water damage in connection with
this appliance, or any of its components.
3. Check area around the boiler. Remove any combustible
materials, gasoline and other flammable liquids.
Closet and alcove installations
This appliance requires a special venting
system. Use only the vent materials, primer
and cement specified in this manual to
make the vent connections. Failure to
follow this warning could result in fire,
personal injury, or death.
For closet and alcove installations as
shown in FIG.’s 1-1 and 1-2, CPVC or
stainless steel vent material must be used
inside the structure. The ventilating air
openings shown in FIG.’s 1-1 and 1-2 are
required for this arrangement. Failure to
follow this warning could result in fire,
personal injury, or death.
WARNING
NOTICE
WARNING
Failure to keep boiler area clear and free
of combustible materials, gasoline, and
other flammable liquids and vapors can
result in severe personal injury, death, or
substantial property damage.
4. The SYNC must be installed so that gas control system
components are protected from dripping or spraying
water or rain during operation or service.
5. If a new boiler will replace an existing boiler, check for
and correct system problems, such as:
• System leaks causing oxygen corrosion or heat exchanger
cracks from hard water deposits.
• Incorrectly-sized expansion tank.
• Lack of freeze protection in boiler water causing system
and boiler to freeze and leak.
Provide clearances:
Clearances from combustible materials
1. Hot water pipes – at least 1/4" (6 mm) from combustible
materials.
2. Vent pipe – at least 1" (25 mm) from combustible
materials.
3. See FIG.’s 1-1 and 1-2 on page 8 for other clearance
minimums.
Clearances for service access
1. See FIG.’s 1-1 and 1-2 on page 8 for recommended
service clearances. If you do not provide the minimum
clearances shown, it may not be possible to service the
boiler without removing it from the space.
WARNING
A closet is any room the boiler is installed in which is less than
778 cubic feet for SB1000 models, 847 cubic feet for SB1300
models, and 914 cubic feet for SB1500 models.
An alcove is any room which meets the criteria for a closet
with the exception that it does not have a door.
Example: Room dimensions = 9 feet long, 9 feet wide, and
9 foot ceiling = 9 x 9 x 9 = 729 cubic feet. This would be
considered a closet for a SYNC Boiler.

Installation & Operation Manual
8
6
"
(152 40 MM)
24" (610 MM)
REAR
0"
LEFT
OPEN FRONT
13" (330 MM)
TOP
0"
RIGHT
1/4” (6 MM) MINIMUM CLEARANCE
A
ROUND HOT WATER PIPES
1” (25 MM) MINIMUM CLEARANCE
A
ROUND VENT PIPES
Figure 1-2 Alcove Installation - Minimum Required Clearances
6" (152 MM)
FRONT
4" (330 MM)
TOP
0"
LEFT
0"
RIGHT
24" (610 MM)
REAR
6" (152 MM)
VENTILATING*
AIR OPENING
VENTILATING*
AIR OPENING
CLOSED DOOR
*AREA OF EACH OPENING:
1 SQ. INCH PER 1000 BTU PER HOUR INPUT
WITH A MINIMUM OF 100 SQ. INCHES
1/4” (6 MM) MINIMUM CLEARANCE
A
ROUND HOT WATER PIPES
1” (25 MM) MINIMUM CLEARANCE
A
ROUND VENT PIPES
Figure 1-1 Closet Installation - Minimum Required Clearances
WARNING For closet installations, CPVC or
stainless steel material MUST BE
used in a closet structure due to
elevated temperatures. Failure to
follow this warning could result in
fire, personal injury, or death.
RECOMMENDED SERVICE
CLEARANCES:
Front - 30" (762 mm)
Top - 24" (610 mm)
Left Side - 24" (610 mm)
Rear - 24" (610 mm)
1 Determine boiler location
RECOMMENDED SERVICE
CLEARANCES:
Front - 30" (762 mm)
Top - 24" (610 mm)
Left Side - 24" (610 mm)
Rear - 24" (610 mm)
WARNING For alcove installations, CPVC or
stainless steel material MUST BE
used in an alcove structure due to
elevated temperatures. Failure to
follow this warning could result in
fire, personal injury, or death.

Installation & Operation Manual
9
1 Determine boiler location (continued)
Provide air openings to room:
The SYNC alone in boiler room
1. No air ventilation openings into the boiler room are
needed when clearances around the SYNC are at least
equal to the SERVICE clearances shown in FIG.’s 1-1
and 1-2. For spaces that do NOT supply this clearance,
provide two openings as shown in FIG. 1-1. Each
opening must provide one square inch free area per 1,000
Btu/hr of boiler input.
2. Combustion air openings are required when using the
Room Air Option on page 27 of this manual.
The SYNC in same space with other gas or oil-fired
appliances
1. Follow the National Fuel Gas Code (U.S.) or CSA B149.1
(Canada) to size/verify size of the combustion/ventilation
air openings into the space.
The space must be provided with
combustion/ventilation air openings
correctly sized for all other appliances
located in the same space as the SYNC.
Do not install the boiler in an attic.
Failure to comply with the above warnings
could result in severe personal injury,
death, or substantial property damage.
2. Size openings only on the basis of the other appliances in
the space. No additional air opening free area is needed
for the SYNC because it takes its combustion air from
outside (direct vent installation).
Do not install the boiler on carpeting even
if foundation is used. Fire can result,
causing severe personal injury, death, or
substantial property damage.
If flooding is possible, elevate the boiler sufficiently to prevent
water from reaching the boiler.
Flooring and foundation
Flooring
The SYNC is approved for installation on combustible
flooring, but must never be installed on carpeting.
Vent and air piping
The SYNC requires a special vent system, designed for
pressurized venting.
The boiler is to be used for either direct vent installation or
for installation using indoor combustion air. When room air
is considered, see Section 4, Vertical Direct Venting. Note
prevention of combustion air contamination below when
considering vent/air termination.
Vent and air must terminate near one another and may be
vented vertically through the roof or out a side wall, unless
otherwise specified. You may use any of the vent/air piping
methods covered in this manual. Do not attempt to install
the SYNC using any other means.
Be sure to locate the boiler such that the vent and air piping
can be routed through the building and properly terminated.
The vent/air piping lengths, routing and termination method
must all comply with the methods and limits given in this
manual.
Prevent combustion air contamination
Install air inlet piping for the SYNC as described in this
manual. Do not terminate vent/air in locations that can allow
contamination of combustion air. Refer to Table 1A, page
10 for products and areas which may cause contaminated
combustion air.
Ensure that the combustion air will not
contain any of the contaminants in Table
1A, page 10. Contaminated combustion
air will damage the boiler, resulting in
possible severe personal injury, death
or substantial property damage. Do not
pipe combustion air near a swimming
pool, for example. Also, avoid areas
subject to exhaust fumes from laundry
facilities. These areas will always contain
contaminants.
WARNING
WARNING
WARNING

Installation & Operation Manual
10
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
Table 1A Corrosive Contaminants and Sources
1 Determine boiler location
Failure to follow all instructions can result
in flue gas spillage and carbon monoxide
emissions, causing severe personal injury
or death.
WARNING
When using an existing vent system to
install a new boiler:
Check the following venting components before installing:
• Material - For materials listed for use with this appliance,
see Section 2 - General Venting, Table 2A. For stainless
steel venting, an adapter of the same manufacturer
(Table 2B) must be used at the flue collar connection.
• Size - To ensure proper pipe size is in place, see Table 2C.
Check to see that this size is used throughout the vent
system.
• Manufacturer - For a stainless steel application, you
must use only the listed manufacturers and their type
product listed in Table 2A for CAT IV positive pressure
venting with flue producing condensate.
• Supports - Non-combustible supports must be in place
allowing a minimum 1/4" rise per foot. The supports
should adequately prevent sagging and vertical slippage,
by distributing the vent system weight. For additional
information, consult the vent manufacturer’s
instructions for installation.
• Terminations - Carefully review Sections 2 through 4 to
ensure requirements for the location of the vent and air
terminations are met and orientation of these fit the
appropriate image from the Sidewall or Vertical
options listed in the General Venting Section. For
stainless steel vent, only use terminations listed in Table
2B for the manufacturer of the installed vent.
• Seal - With prior requirements met, the system should be
tested to the procedure listed in parts (c) through (f) of
the Removal of an Existing Boiler Section on page 11.
With stainless steel vent, seal and connect all pipe and
components as specified by the vent manufacturer used; with
PVC/CPVC vent, see the Installing Vent or Air Piping Section
on page 19.
WARNING If any of these conditions are not met,
the existing system must be updated or
replaced for that concern. Failure to
follow all instructions can result in flue gas
spillage and carbon monoxide emissions,
causing severe personal injury or death.

Installation & Operation Manual
1 Determine boiler location (continued)
11
When removing a boiler from existing
common vent system:
Do not install the SYNC into a common
vent with any other appliance. This
will cause flue gas spillage or appliance
malfunction, resulting in possible severe
personal injury, death, or substantial
property damage.
Failure to follow all instructions can result
in flue gas spillage and carbon monoxide
emissions, causing severe personal injury
or death.
a. Seal any unused openings in the common venting system.
b. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage
or restriction, leakage, corrosion, or other deficiencies,
which could cause an unsafe condition.
c. Test vent system – Insofar as is practical, close all building
doors and windows and all doors between the space
in which the appliances remaining connected to the
common venting system are located and other spaces of
the building. Turn on clothes dryers and any appliance
not connected to the common venting system. Turn on
any exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed. Do not
operate a summer exhaust fan. Close fireplace dampers.
d. Place in operation the appliance being inspected. Follow
the lighting instructions. Adjust thermostat so appliance
will operate continuously.
e. 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.
f. After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined herein, return
doors, windows, exhaust fans, fireplace dampers, and any
other gas-burning appliance to their previous conditions
of use.
g. 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 and/or CAN/CSA B149.1,
Natural Gas and Propane Installation Code.
DANGER
WARNING
Remove boiler from wood pallet
1. After removing the outer shipping carton from the boiler,
remove the parts package (packaged parts inside the jacket
of the boiler).
2. To remove the boiler from the pallet:
a. Remove the front door of the boiler.
b. Remove the two lag bolts from the wood pallet
inside the boiler (FIG. 1-3).
c. Detach the boiler from the lag bolts in the rear of
the unit, see FIG. 1-3.
Do not drop the boiler or bump the jacket
on the floor or pallet. Damage to the boiler
can result.
LAG BOLTS
(QTY. 3)
FRON
T
LAG BOLTS
(QTY. 3)
REAR
Figure 1-3 Boiler Mounted on Shipping Pallet
NOTICE
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.
Maintain minimum specified clearances for adequate operation.
All installations must allow sufficient space for servicing the
vent connections, water pipe connections, piping and other
auxiliary equipment, as well as the appliance. The clearance
labels on each appliance note the same service and combustible
clearance requirements as shown in this manual.
Multiple appliances may be installed in a modular boiler
installation. Multiple appliances may be installed side by side
with no clearance between adjacent appliances because this
appliance is approved for zero clearance from combustible
surfaces and no service access is required from the sides.
Consult the Venting section of this manual for specific
installation instructions for the appropriate type of venting
system that you will be using.

1 Determine boiler location
12
Installation & Operation Manual
Combustion and ventilation air
requirements for appliances drawing air
from the equipment room
Provisions for combustion and ventilation air must be in
accordance with Air for Combustion and Ventilation, of
the latest edition of the National Fuel Gas Code, ANSI
Z223.1, in Canada, the latest edition of CGA Standard B149
Installation Code for Gas Burning Appliances and Equipment,
or applicable provisions of the local building codes.
The equipment room MUST be provided with properly sized
openings to assure adequate combustion air and proper
ventilation.
Figure 1-4_Combustion Air Direct from Outside
Figure 1-5_Combustion Air Through Ducts
2. If combustion and ventilation air is taken from the
outdoors using a duct to deliver the air to the
equipment room, each of the two openings should be
sized based on a minimum free area of one square inch
per 2000 Btu/hr (11 cm2per kW) of input (see FIG. 1-5).
IF NECESSARY
FOR TIGHT
CONSTRUCTION
Figure 1-6_Combustion Air from Interior Space
1. If air is taken directly from outside the building
with no duct, provide two permanent openings to
the equipment room (see FIG. 1-4):
(a) Combustion air opening, with a minimum free
area of one square inch per 4000 Btu/hr input
(5.5 cm2per kW). This opening must be
located within 12" (30 cm) of the bottom of the
enclosure.
(b) Ventilation air opening, with a minimum free
area of one square inch per 4000 Btu/hr input
(5.5 cm2 per kW). This opening must be
located within 12" (30 cm) of the top of the
enclosure.
3. If air is taken from another interior space, each of the
two openings specified above should have a net free
area of one square inch for each 1000 Btu/hr (22 cm2
per kW) of input, but not less than 100 square inches
(645 cm2) (see FIG. 1-6).

13
Figure 1-7_Combustion Air from Outside - Single
Opening
4. If a single combustion air opening is provided to bring
combustion air in directly from the outdoors, the opening
must be sized based on a minimum free area of one
square inch per 3000 Btu/hr (7 cm2per kW). This
opening must be located within 12" (30 cm) of the top of
the enclosure (see FIG. 1-7).
TABLE - 1B
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
Model
Number
FIG. 1-4 FIG. 1-5 FIG. 1-6 FIG. 1-7
*Outside Air from
2 Openings Directly from
Outdoors
*Outside Air from
2 Ducts Delivered from
Outdoors
**Inside Air from
2 Ducts Delivered from
Interior Space
*Outside Air from
1 Opening Directly
from Outdoors, in2
Top
Opening, in2
Bottom
Opening, in2
Top
Opening, in2
Bottom
Opening, in2
Top
Opening, in2
Bottom
Opening, in2
1.0 250
(1613 cm2)
250
(1613 cm2)
500
(3226 cm2)
500
(3226 cm2)
1000
(6452 cm2)
1000
(6452 cm2)
333
(2149 cm2)
1.3 325
(2097 cm2)
325
(2097 cm2)
650
(4194 cm2)
650
(4194 cm2)
1300
(8388 cm2)
1300
(8388 cm2)
433
(2794 cm2)
1.5 375
(2420 cm2)
375
(2420 cm2)
750
(4839 cm2)
750
(4839 cm2)
1500
(9678 cm2)
1500
(9678 cm2)
500
(3226 cm2)
All dimensions based on net free area in square inches. Metal
louvers or screens reduce the free area of a combustion air
opening a minimum of approximately 25%. Check with
louver manufacturers for exact net free area of louvers.
CAUTION Under no circumstances should the
equipment room ever be under negative
pressure. Particular care should be taken
where exhaust fans, attic fans, clothes dryers,
compressors, air handling units, etc., may
take away air from the unit.
The result is improper combustion and a non-warrantable,
premature appliance failure.
EXHAUST FANS: Any fan or equipment which exhausts air
from the equipment room may deplete the combustion air
supply and/or cause a downdraft in the venting system. Spillage
of flue products from the venting system into an occupied
living space can cause a very hazardous condition that must be
corrected immediately.
The combustion air supply must be completely free of any
flammable vapors that may ignite or chemical fumes which may
be corrosive to the appliance. Common corrosive chemical
fumes which must be avoided are fluorocarbons and other
halogenated compounds, most commonly present as refrigerants
or solvents, such as Freon, trichlorethylene, perchlorethylene,
chlorine, etc. These chemicals, when burned, form acids which
quickly attack the stainless steel heat exchanger, headers, flue
collectors, and the vent system.
Combustion air requirements are based on the latest edition
of the National Fuel Gas Code, ANSI Z223.1; in Canada refer
to the latest edition of CGA Standard CAN B149.1. Check all
local code requirements for combustion air.
1 Determine boiler location (continued)
Installation & Operation Manual
*Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a
duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings.
The above requirements are for the appliance only; additional gas fired appliances in the equipment room will require an increase
in the net free area to supply adequate combustion air for all appliances.
**Combined interior space must be 50 cubic feet per 1,000 Btu/hr input. Buildings MUST NOT be of *“Tight Construction”. For
buildings of *“Tight Construction”, provide air openings into the building from outside.
*No combustion air openings are needed when the appliance is installed in a space with a volume NO LESS than 50 cubic feet per
1,000 Btu/hr of all installed gas fired appliances. Buildings MUST NOT be of *“Tight Construction”.
*”Tight Construction” is defined as a building with less than 0.40 ACH (air changes per hour).
Where two openings are provided, one must be within 12"
(30cm) of the ceiling and one must be within 12" (30cm) of the
floor of the equipment room. Each opening must have net free
area as specified in the chart below (Table 1B). Single openings
shall commence within 12" (30cm) of the ceiling.

14
Installation & Operation Manual
PVC/CPVC Two Pipe
See Figure 3-1A Stainless Steel
Two Pipe
See Figure 3-2
Direct venting options - Sidewall Vent
2 General venting
PVC/CPVC
Room Air
See Figure 4-5
Stainless Steel
Room Air
See Figure 4-5
Sidewall Vent Optional Room Air

15
Installation & Operation Manual
2 General venting (continued)
Vertical Vent Optional Room Air
PVC/CPVC
Room Air
See Figure 4-5
Stainless Steel
Room Air
See Figure 4-5
PVC/CPVC
Two Pipe
See Figure 4-1
Stainless Steel
Two Pipe
See Figure 4-2
Direct venting options - Vertical Vent

16
PVC/CPVC
Vertical Vent, Sidewall Air
Stainless Steel
Vertical Vent, Sidewall Air
Direct venting options - Vertical Vent, Sidewall Air
2 General venting
Installation & Operation Manual

17
Installation & Operation Manual
2 General venting (continued)
PVC/CPVC vent piping materials
Use only the materials listed in Table 2A
on page 19 for vent pipe, and fittings.
Failure to comply could result in severe
personal injury, death, or substantial
property damage.
Installation must comply with local
requirements and with the National
Fuel Gas Code, ANSI Z223.1 for U.S.
installations or CSA B149.1 for Canadian
installations.
Install vent and combustion air piping
DANGER The SYNC must be vented and supplied
with combustion and ventilation air as
described in this section. Ensure the vent
and air piping and the combustion air
supply comply with these instructions
regarding vent system, air system, and
combustion air quality. See also Section
1 of this manual.
Inspect finished vent and air piping
thoroughly to ensure all are airtight and
comply with the instructions provided
and with all requirements of applicable
codes.
Failure to provide a properly installed
vent and air system will cause severe
personal injury or death.
All PVC vent pipes must be glued,
properly supported, and the exhaust must
be pitched a minimum of a 1/4 inch per
foot back to the boiler (to allow drainage
of condensate).
This appliance requires a special venting
system. Use only the vent materials,
primer, and cement specified in this
manual to make the vent connections.
Failure to follow this warning could result
in fire, personal injury, or death.
WARNING
NOTICE
WARNING
WARNING For closet and alcove installations, CPVC
material MUST BE used in a closet/alcove
structure. Failure to follow this warning
could result in fire, personal injury, or
death.
NOTICE
For all installations, the first ten (10)
equivalent feet of vent must be CPVC or
stainless steel (see FIG.’s 2-1A and 2-1B
below). Failure to follow this warning could
result in fire, personal inury, or death.
WARNING
5'
CPVC ELBOW CPVC PIPE
Figure 2-1A CPVC Starter Vent - Horizontal
5'
CPVC PIPE
CPVC PIPE
CPVC ELBOW
Figure 2-1B CPVC Starter Vent - Vertical

18
Installation & Operation Manual
PVC/CPVC air intake/vent connections
1. Combustion Air Intake Connector (FIG. 2-2) - Used to
provide combustion air directly to the unit from
outdoors. A fitting is provided on the unit for final
connection. Combustion air piping must be supported
per guidelines listed in the National Mechanical Code,
Section 305, Table 305.4 or as local codes dictate.
2. Vent Connector (FIG. 2-2) - Used to provide a
passageway for conveying combustion gases to the
outside. A transition fitting is provided on the unit for
final connection. Vent piping must be supported per the
National Building Code, Section 305, Table 305.4 or as
local codes dictate.
VENT AIR
PVC/CPVC ADAPTER
FACTORY INSTALLED
Figure 2-2 Near Boiler PVC/CPVC Venting
Air inlet pipe materials:
The air inlet pipe(s) must be sealed. Choose acceptable
combustion air inlet pipe materials from the following list:
PVC, CPVC or ABS
Dryer Vent or Sealed Flexible Duct (not recommended
for rooftop air inlet)
Galvanized steel vent pipe with joints and seams sealed
as specified in this section.
Type “B” double-wall vent with joints and seams sealed
as specified in this section.
AL29-4C, stainless steel material to be sealed to
specification of its manufacturer.
*Plastic pipe may require an adapter (not provided) to
transition between the air inlet connection on the appliance
and the plastic air inlet pipe.
WARNING Using vent or air intake materials other
than those specified, failure to properly
seal all seams and joints or failure to follow
vent pipe manufacturer’s instructions can
result in personal injury, death or property
damage. Mixing of venting materials will
void the warranty and certification of the
appliance.
NOTICE The use of double-wall vent or insulated
material for the combustion air inlet
pipe is recommended in cold climates
to prevent the condensation of airborne
moisture in the incoming combustion air.
Sealing of Type “B” double-wall vent material or galvanized
vent pipe material used for air inlet piping on a sidewall or
vertical rooftop Combustion Air Supply System:
a. Seal all joints and seams of the air inlet pipe using either
Aluminum Foil Duct Tape meeting UL Standard 723 or
181A-P or a high quality UL Listed silicone sealant such
as those manufactured by Dow Corning or General
Electric.
b. Do not install seams of vent pipe on the bottom of
horizontal runs.
c. Secure all joints with a minimum of three sheet metal
screws or pop rivets. Apply Aluminum Foil Duct Tape or
silicone sealant to all screws or rivets installed in the vent
pipe.
d. Ensure that the air inlet pipes are properly supported.
The PVC, CPVC, or ABS air inlet pipe should be cleaned and
sealed with the pipe manufacturer’s recommended solvents
and standard commercial pipe cement for the material used.
The PVC, CPVC, ABS, Dryer Vent or Flex Duct air inlet pipe
should use a silicone sealant to ensure a proper seal at the
appliance connection and the air inlet cap connection. Dryer
vent or flex duct should use a screw type clamp to seal the
vent to the appliance air inlet and the air inlet cap. Proper
sealing of the air inlet pipe ensures that combustion air will be
free of contaminants and supplied in proper volume.
2 General venting

19
Requirements for installation in Canada
1. Installations must be made with a vent pipe system
certified to ULC-S636.
IPEX is an approved vent manufacturer in Canada
supplying vent material listed to ULC-S636.
2. The first three (3) feet of plastic vent pipe from the
appliance flue outlet must be readily accessible for visual
inspection.
3. The components of the certified vent system must not be
interchanged with other vent systems or unlisted
pipe/fittings. For concentric vent installations, the inner
vent tube must be replaced with field supplied certified
vent material to comply with this requirement.
2 General venting (continued)
Installation & Operation Manual
Installing vent and air piping
Improper installation of PVC or CPVC
systems may result in injury or death.
CAUTION
Use only cleaners, primers, and solvents
that are approved for the materials which
are joined together.
NOTICE
1. Work from the boiler to vent or air termination. Do not
exceed the lengths given in this manual for the air or vent
piping.
2. Cut pipe to the required lengths and deburr the inside
and outside of the pipe ends.
3. Chamfer outside of each pipe end to ensure even cement
distribution when joining.
4. Clean all pipe ends and fittings using a clean dry rag.
(Moisture will retard curing and dirt or grease will
prevent adhesion.)
5. Dry fit vent or air piping to ensure proper fit up before
assembling any joint. The pipe should go a third to
two-thirds into the fitting to ensure proper sealing after
cement is applied.
6. Priming and Cementing:
a. Handle fittings and pipes carefully to prevent
contamination of surfaces.
b. Apply a liberal even coat of primer to the fitting
socket.
c. Apply a liberal even coat of primer to the pipe end to
approximately 1/2" beyond the socket depth.
d. Apply a second primer coat to the fitting socket.
e. While primer is still wet, apply an even coat of
approved cement to the pipe equal to the depth of
the fitting socket.
f. While primer is still wet, apply an even coat of
approved cement to the fitting socket.
g. Apply a second coat of cement to the pipe.
h. While the cement is still wet, insert the pipe into the
fitting, if possible twist the pipe a 1/4 turn as you insert
it. NOTE: If voids are present, sufficient cement was
not applied and joint could be defective.
i. Wipe excess cement from the joint removing ring or
beads as it will needlessly soften the pipe.
Table 2A PVC, Vent Pipe, and Fittings
All vent pipe materials and fittings must comply with the following:
Item Material Standards for installation in:
United States Canada
Vent pipe
and fittings
PVC Plastic Pipe, Schedules 40, 80, & 120 ANSI/ASTM D1785 CPVC and PVC venting must be
ULC-S636 Certified. IPEX is an
approved manufacturer in Canada
supplying vent material listed to
ULC-S636.
PVC Plastic Pipe Fittings, Schedule 40 ANSI/ASTM D2466
PVC Plastic Pipe Fittings, Schedule 80 ANSI/ASTM D2467
PVC - DWV Pipe and Fittings ANSI/ASTM D2665
CPVC Plastic Pipe, Schedule 40 & 80 ANSI/ASTM F441
CPVC Plastic Pipe Fittings, Schedule 80 ANSI/ASTM F439
AL29-4C UL1738 ULC-S636

20
Installation & Operation Manual
Stainlesssteelairintake/ventconnections
1. Combustion Air Intake Connector (FIG. 2-3) - Used to
provide combustion air directly to the unit from outdoors.
A fitting is provided on the unit for final connection.
Combustion air piping must be supported per guidelines
listed in the National Mechanical Code, Section 305, Table
305.4 or as local codes dictate.
2. Vent Connector (FIG. 2-3) - Used to provide a
passageway for conveying combustion gases to the
outside. A transition fitting is provided on the unit for
final connection. Vent piping must be supported per the
National Building Code, Section 305, Table 305.4 or as
local codes dictate.
REMOVE PVC/CPVC VENT
CONNECTOR WHEN
INSTALLING STAINLESS STEEL
Figure 2-3 Near Boiler Stainless Steel Venting
Stainless steel vent and air piping
This product has been approved for use with stainless
steel FasNseal vent systems manufactured by Dura-vent.
Lochinvar offers a matching stainless steel sidewall vent
termination kit, see Table 3A on page 22.
WARNING
NOTICE
NOTICE
The installer must use a specific vent starter
adapter supplied by the vent manufacturer to
adapt to different vent systems. See Table 2B
for approved vent adapters.
NOTICE
STAINLESS STEEL VENT TERMINATION KITS
Kit Part Number Model Component Description
KIT30028 SB 1000 - 1500
6" PVC x 6" Stainless Steel
Adapter
6" Stainless Steel Vent
Termination
6" Stainless Steel Air Inlet
KIT30029 SB 1300 - 1500
6" PVC x 6" Stainless Steel
Adapter
6" Stainless Steel x 7"
Stainless Steel Adapters (2)
7" Stainless Steel Vent
Termination
7" Stainless Steel Air Inlet
Table 2B Approved Stainless Steel Terminations and
Adapters
When a sidewall or vertical rooftop combustion air supply
system is disconnected for any reason, the air inlet pipe must
be resealed to ensure that combustion air will be free of
contaminants and supplied in proper volume.
DANGER Failure to properly seal all joints and seams
as required in the air inlet piping may
result in flue gas recirculation, spillage
of flue products and carbon monoxide
emissions causing severe personal injury
or death.
The SYNC uses model specific combustion air intake
and vent piping sizes as detailed in Tables 2C and 2D
on page 21.
Increasing or decreasing combustion
air or vent piping to sizes not specified
in this manual is not authorized.
NOTICE
PVC/CPVC or ABS is acceptable air inlet pipe material.
NOTICE
2 General venting
Use only the materials, vent systems, and
terminations listed in Table 2B. DO
NOT mix vent systems of different types
or manufacturers, unless listed in this
manual. Failure to comply could result
in severe personal injury, death, or
substantial property damage.
Installations must comply with applicable
national, state, and local codes. Stainless
steel vent systems must be listed as a
UL-1738 approved system for the United
States and a ULC-S636 approved system
for Canada.
Installation of a stainless steel vent system
should adhere to the stainless steel vent
manufacturer’s installation instructions
supplied with the vent system.