HTP EnduroTI ETI-1000 Installation manual

EnduroTI
®
Commercial Boilers
Installation
Start-Up
Maintenance
Parts
Warranty
ETI-750 / ETI-1000 Models*
*“HL” Denotes Installed High and Low Gas
Pressure Switches
This manual must only be used by a qualied installer / service technician. Read all instructions in this manual before installing.
Perform steps in the given order. Failure to do so could result in substantial property damage, severe personal injury, or death.
HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical errors
in literature.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
272 Duchaine Blvd. New Bedford, MA 02745 www.htproducts.com
LP-517 Rev. 000 Rel. 019 Date 7.21.20
Improper installation, adjustment, alteration, service, or maintenance could void product warranty and cause property
damage, severe personal injury, or death.
Heat Exchanger Bears the ASME “H” Stamp

LP-517 Rev. 000 Rel. 019 Date 7.21.20
2
WARNING: If the information in these instructions is not followed exactly, a re or explosion may result causing property damage, personal
injury or death.
• Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL 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 re department.
• Installation and service must be provided by a qualied installer, service agency or the gas supplier.
Improper installation, adjustment, alteration, service, or maintenance can cause injury, property damage, or death. Refer to this
manual. Installation and service must be performed by a qualied installer, service agency, or gas supplier.

LP-517 Rev. 000 Rel. 019 Date 7.21.20
3
The following dened terms are used throughout this manual to
bring attention to the presence of hazards of various risk levels or
to important product information.
DANGER indicates an imminently hazardous situation which, if
not avoided, will result in serious personal injury or death.
WARNING indicates a potentially hazardous situation which, if
not avoided, could result in personal injury or death.
CAUTION indicates a potentially hazardous situation which, if not
avoided, may result in moderate or minor personal injury.
CAUTION used without the safety alert symbol indicates a
potentially hazardous situation which, if not avoided, may result
in property damage.
NOTICE is used to address practices not related to personal injury.
Foreword
This manual is intended to be used in conjunction with other
literature provided with the boiler. This includes all related control
information. It is important that this manual, all other documents
included in this system, and additional publications including the
National Fuel Gas Code - ANSI Z223.1 (latest versions), be reviewed in
their entirety before beginning any work.
Installation should be made in accordance with the regulations of
the Authority Having Jurisdiction, local code authorities, and utility
companies which pertain to this type of water heating equipment.
For the Installer
This boiler must be installed by qualied and licensed personnel.
The installer should be guided by the instructions furnished with the
boiler, and by local codes and utility company requirements. In the
absence of local codes, preference should be given to the National Fuel
Gas Code - ANSI Z223.1, latest version.
Installations Must Comply With:
Local, state, provincial, and national codes, laws, regulations, and
ordinances.
The latest version of the National Fuel Gas Code, ANSI Z223.1, from
American Gas Association Laboratories, 8501 East Pleasant Valley
Road, Cleveland, OH 44131.
In Canada - CGA No. B149 (latest version), from Canadian Gas
Association Laboratories, 55 Scarsdale Road, Don Mills, Ontario,
Canada M3B 2R3. Also, Canadian Electrical Code, C 22.1, from Canadian
Standards Association, 5060 Spectrum Way, Suite 100, Mississauga,
Ontario, Canada L4W 5N6.
The latest version of the National Electrical Code, NFPA No. 70.
NOTE: The gas manifold and controls met safe lighting and other
performance criteria when undergoing tests specied in ANSI Z21.13
- latest edition.
Authority Having Jurisdiction (AHJ) – The AHJ may be a federal, state,
local government, or individual such as a re chief, re marshal, chief
of a re prevention bureau, labor department or health department,
building ocial or electrical inspector, or others having statutory
authority. In some circumstances, the property owner or his/her agent
assumes the role, and at government installations, the commanding
ocer or departmental ocial may be the AHJ.
NOTE: HTP, Inc. reserves the right to modify product technical
specications and components without prior notice.

LP-517 Rev. 000 Rel. 019 Date 7.21.20
4
Table of Contents
Part 1 - General Safety Information 5
A. Improper Combustion 6
B. Gas 6
C. When Servicing the Boiler 6
D. Boiler Water 6
E. Freeze Protection 6
F. High Elevation Installations 6
Part 2 - Before You Start 6
A. What’s in the Box 6
B. How the Boiler Operates 6
C. Optional Equipment 7
Part 3 - Prepare the Boiler 7
A. Locating the Boiler 7
B. Flooring 9
C. Leveling 9
D. Clearances for Service Access 9
E. Residential Garage and Closet Installations 10
F. Exhaust Vent and Intake Pipe 11
1. Direct Vent of Exhaust and Intake 11
2. Power Venting, Indoor Combustion Air in Conned or Unconned
Space 11
G. Carbon Monoxide Detectors 11
H. Prevent Combustion Air Contamination 12
I. Removing a Boiler from a Common Vent System 12
J. Water Chemistry Requirements* 12
Part 4 - Piping 14
A. General Plumbing Information 14
B. Relief Valve 14
C. Backow Preventer 14
D. Expansion Tank 14
E. Circulators 15
F. Hydronic Piping with Circulators, Zone Valves, and Multiple
Boilers 15
G. Circulator Sizing 16
H. Check / Control Water Chemistry 17
I. Plumbing 17
J. Fill and Purge Heating System 18
K. Freeze Protection Fluids 18
L. Zoning with Zone Valves 18
M. Zoning with Circulators 18
N. Multiple Boilers 18
O. Applications* 19
Part 5 - Venting 21
A. General 21
B. Approved Materials for Exhaust Vent and Intake Pipe 22
C. Additional Requirements for Installation in Canada 22
D. Exhaust Vent and Intake Pipe Location 23
E. Exhaust Vent and Intake Pipe Sizing 24
F. Exhaust Vent and Intake Pipe Installation 24
G. Applications 25
1. Direct Vent Installation of Exhaust and Intake 25
2. Power Venting, Room and Indoor Combustion Ventilation
Requirements 26
Part 6 - Condensate Removal 28
Part 7 - Wiring 29
A. Installation Must Comply With 30
B. Field Wiring 30
The CSD-1 ASME Code, Section CW-400 requires that hot water
heating and supply boilers have a) a UL 353 temperature control
device, b) at least one (1) temperature-actuated control to shut
o the fuel supply when system water reaches a preset operating
temperature, c) a high temperature limit control that prevents
the water temperature from exceeding the maximum allowable
temperature by causing a safety shutdown and lockout, and d) its
own sensing element and operating switch.
The temperature control system integrated into the 928 control
provided with this heating appliance complies with the requirements
of CSD-1 Section CW-400 as a temperature operation control. The
control monitors the temperature dierence between the inlet
and the outlet sensor, which is aected by boiler water ow. If this
temperature dierence exceeds 55°F (typically because of low water
ow or very low heat load), the control will reduce the maximum fan
speed. If the temperature dierence exceeds 60°F, the control will
eectively sense there is little or no water ow or heat load and shut
the boiler down. The controller will restart automatically once the
temperature dierence has dropped below 55°F and the minimum
o time (anti-cycle time) has expired. In addition, if the control
senses that the outlet water temperature has reached 210°F, the
boiler is put into a hard lockout and requires manual reset to restart.
The hydronic supply and return connections of these products
are for installation in closed loop systems ONLY! Use of this
product in any manner other than described in this manual may
result in premature product failure, substantial property damage,
severe personal injury, or death. Damage or failure of this product
(or the system in which it is installed) due to unauthorized use IS
NOT COVERED BY WARRANTY.
IMPORTANT
In accordance with Section 325 (f) (3) of the Energy Policy and
Conservation Act, HTP, Inc. has provided this boiler with multiple
features designed to save energy by reducing the boiler water
temperature as heating load decreases.
These features include:
• A modulating combustion system that adjusts ring rate
based on heat demand.
• Adjustment of boiler set point based on inferred heat
load as determined by an outdoor sensor. The outdoor
sensor is supplied by HTP, Inc. with this boiler.
• This boiler does not include a standing pilot.
• This boiler is designed and shipped to assure the highest
eciency operation possible. Such high eciency is
achieved by limiting heating circuit water temperature to
140°F when there is no anticipated heat load, based upon
the outdoor sensor and the Outdoor Reset Curve (sensor
response curve) in the boiler software.
• This feature may be over-ridden as described below in
specic installations:
• The boiler control is equipped with an outdoor sensor
override for use with building management systems or in
cascaded systems (for systems with total input of 300,000
BTU/hr or greater).
See statement below for an important notice on the use of the
override.
IMPORTANT
In accordance with Section 325 (f) (3) of the Energy Policy and
Conservation Act, this boiler is equipped with a feature that
saves energy by reducing the boiler water temperature as
the heating load decreases. This feature is equipped with an
override which is provided primarily to permit the use of an
external energy management system that serves the same
function. THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST
ONE OF THE FOLLOWING CONDITIONS IS TRUE:
• An external energy management system is installed that
reduces the boiler water temperature as the heating load
decreases.
• This boiler is not used for space heating.
• This boiler is part of a modular or multiple boiler system
having a total input of 300,000 BTU/hr or greater.
• This boiler is equipped with a tankless coil.

LP-517 Rev. 000 Rel. 019 Date 7.21.20
5
C. Line Voltage Wiring for Standard Boiler 30
D. Alarm Connections 30
E. Low Voltage Connections for Standard Boiler 30
F. Thermostat 30
G. Outdoor Sensor 31
H. Indirect Sensor 31
I. Optional 0-10 Volt Building Control Signal 31
J. Optional High Gas Pressure Switch 31
K. Optional Low Gas Pressure Switch 31
L. Optional Flow Switch 32
M. UL353 Internal Low Water Cut-O (Factory Installed) 32
N. Optional High Limit Manual Reset 32
P. Wiring of Cascade System Communication Bus 32
Q. Cascade Master Pump and Sensor Wiring 32
R. Cascade Follower Pump and Sensor Wiring 32
S. Variable Speed Pumping 32
Part 8 - Gas Connections 35
A. Gas Piping 35
B. Gas Table 36
C. Check Inlet Gas Pressure 36
D. Boiler Gas Valve 37
Part 9 - Start-Up Preparation 37
A. Check / Control Water Chemistry 37
B. Check for Gas Leaks 38
C. Freeze Protection (When Used) 38
D. Fill and Test Water System 38
E. Purge Air from Water System 38
F. Check Thermostat Circuit(s) 39
G. Condensate Removal 39
H. Final Checks Before Starting Boiler 39
I. Setting Up a Single Boiler 39
J. Setting Up a Cascaded System 39
K. Lockout Condition 40
L. Cascade System Programming 40
M. Initial Operation - Boiler Door and Seal 40
Part 10 - Start-Up Procedure 40
A. Control Overview 41
B. Navigation of the Display 41
C. Operating Instructions 41
D. Programming Boiler Settings 41
E. Programming the System Setting 42
F. System Setting Program Navigation 42
G. Resetting the Maintenance Schedule 45
Part 11 - Start-Up Procedures for the Installer 45
A. Boiler Control Status Menu 45
B. Cascade Menu 47
C. Boiler Test Mode 48
Part 12 - Troubleshooting 48
A. Boiler Error and Fault Codes 48
B. Boiler Error 49
C. Boiler Fault 49
D. User Interface Display 49
Part 13 - Maintenance 56
A. Procedures 56
B. Closing the Combustion Chamber Door 56
C. Replacing the Door Seal 57
D. Maintaining the Condensate System 57
Part 14 - Shutdown 58
A. Shutdown Procedure 58
B. Vacation Procedure 58
C. Failure to Operate 58
Part 15 - Installing the Optional Jacket 61
Part 16 - Installation Checklist 62
Part 17 - Maintenance Report 62
Limited Warranty 64
Maintenance Notes 66
Customer Installation Record Form 67
Part 1 - General Safety Information
This boiler is approved for indoor installations only and is not intended
for use as a pool heater. Clearance to combustible materials: 6” top,
0” sides, and 18” back. Boiler must have room for service: 45” front
and 18” left side are minimum recommended service clearances. (A
combustible door or removable panel is acceptable front clearance.)
This boiler has not been approved for installation on combustible
ooring. Do not install on carpeting. Install the boiler in a location
where temperature and pressure relief valve discharge or a leak will
not result in damage to the surrounding area. If such a location is
not available, install an auxiliary catch pan. Use only Category IV vent
systems.
Installer - Read all instructions in this manual before installing.
Perform steps in the given order.
User - This manual is for use only by a qualied heating installer /
service technician. Have this boiler serviced / inspected annually by
a qualied service technician.
FAILURE TO ADHERE TO THE GUIDELINES ON THIS PAGE
CAN RESULT IN SUBSTANTIAL PROPERTY DAMAGE, SEVERE
PERSONAL INJURY, OR DEATH.
DO NOT USE THIS BOILER IF ANY PART HAS BEEN SUBMERGED
IN WATER. Immediately call a qualied service technician. The
boiler MUST BE replaced if it has been submerged. Attempting to
operate a boiler that has been submerged could create numerous
harmful conditions, such as a potential gas leakage causing a re
and/or explosion, or the release of mold, bacteria, or other harmful
particulates into the air. Operating a previously submerged boiler
could result in property damage, severe personal injury, or death.
NOTE: Boiler damage due to ood or submersion is considered an
Act of God, and IS NOT covered under product warranty.
NOTE: Obey all local codes. Obtain all applicable permits before
installing the boiler.
NOTE: Install all system components and piping in such a manner
that does not reduce the performance of any re rated assembly.
Altering any HTP, Inc. boiler with parts not manufactured by HTP,
Inc. WILL INSTANTLY VOID the boiler warranty and could result in
property damage, personal injury, or death.
NOTE: If the boiler is exposed to the following, do not operate.
Immediately call a qualied service technician.
1. Fire
2. Damage
3. Water
Failure to follow this information could result in property damage,
severe personal injury, or death.
Do not use this boiler for anything other than its intended purpose
(as described in this manual). Doing so could result in property
damage and WILL VOID product warranty.
High heat sources (sources generating heat 100oF / 37oC or greater,
such as stove pipes, space heaters, etc.) may damage plastic
components of the boiler as well as plastic vent pipe materials. Such
damages ARE NOT covered by warranty. It is recommended to keep
a minimum clearance of 8” from high heat sources. Observe heat
source manufacturer instructions, as well as local, state, provincial,
and national codes, laws, regulations and ordinances when installing
this boiler and related components near high heat sources.

LP-517 Rev. 000 Rel. 019 Date 7.21.20
6
A. Improper Combustion
Do not obstruct the ow of combustion and ventilating air. Adequate
air is necessary for safe operation. Failure to keep the exhaust vent
and combustion air intake clear of ice, snow, or other debris could
result in property damage, serious personal injury, or death.
B. Gas
Should overheating or gas supply fail to shut o, turn o the manual
gas control valve to the boiler.
C. When Servicing the Boiler
To avoid electric shock, disconnect electrical supply before performing
maintenance.
NOTE: When inquiring about service or troubleshooting, reference the
model and serial numbers from the boiler rating label.
To avoid severe burns, allow boiler and associated equipment to cool
before servicing.
Be sure to disconnect electrical power before opening boiler cabinet
or performing service. Failure to do so could result in electrical shock,
property damage, serious personal injury, or death.
D. Boiler Water
• If you have an old system with cast iron radiators, thoroughly
ush the system (without boiler connected) to remove
sediment. The high-eciency heat exchanger can be damaged
by build-up or corrosion due to sediment. HTP recommends a
suction strainer in this type of system.
• Do not use petroleum-based cleaning or sealing compounds
in boiler system. Gaskets and seals in the system may be
damaged, possibly resulting in substantial property damage.
• Do not use “homemade cures” or “boiler patent medicines”.
Substantial property damage, damage to boiler, and/or serious
personal injury 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 from make-up water can cause internal corrosion
in system components. Leaks in the boiler or piping must be
repaired at once.
NEVER use any toxic chemical, including automotive, standard
glycol antifreeze, or ethylene glycol made for hydronic (non-
potable) systems. These chemicals can attack gaskets and seals
in water systems, are poisonous if consumed, and can cause
personal injury or death.
UNCRATING THE BOILER - Any claims for damage or shortage in
shipment must be led immediately against the transportation
company by the consignee.
Part 2 - Before You Start
Failure of the boiler due to freeze related damage IS NOT covered by
product warranty.
E. Freeze Protection
NOTE: Consider piping and installation when determining boiler
location.
Remove all sides of the shipping crate of the boiler.
Components included with the boiler:
• Outdoor Sensor
• Condensate Trap and Installation Components
• Three (3) Stainless Steel Screens
• Installation Manual and Warranty
• User’s Information Manual
• CSD-1 Form
• H-2 Data Sheet
A. What’s in the Box
B. How the Boiler Operates
Condensing technology intelligently delivers highly ecient
hydronic heating while maximizing eciency by measuring data
from the heating system. The following are features of the system
and how they operate.
Stainless Steel / Steel Heat Exchanger
The highly ecient heat exchanger is designed to use the cold
water return from the system and extract the last bit of heat before
it is exhausted.
Modulating Combustion System
The combustion system modulates the output of the burner during
operation to match system demand and achieve the control set
point while in operation. The set point can change by internal or
external signals to enhance the overall performance of the system.
Control
The integrated control system monitors the system and regulates
fan speed to control boiler output. This allows the boiler to deliver
only the amount of heat energy required and nothing more. The
system can be further enhanced by installing an indirect water
heater to provide domestic hot water.
The control can regulate the output of multiple boilers through
its cascade system function. The cascade system is capable of
connecting up to eight boilers together in such a way that they
function as one boiler system. This allows for greater turn down
ratios and provides systematic control of the multiple boilers in an
installation to minimize downtime and maximize eciency.
The cascade system works by establishing one boiler as the master
and the other connected boilers as followers. The master boiler
requires a cascade system sensor and a cascade pump in addition
to its own boiler pump. Each of the follower boilers will have its own
pump to provide maximum ow and control heat exchanger ow
rate.
F. High Elevation Installations
Natural gas at high elevation might contain less heating value
than typical 1,000 BTU/cu ft and therefore can cause improper
air / gas mix leading to improper combustion. For natural gas
installations above 3,000 ft, call your gas provider to determine
the heating value of the supplied natural gas.
Due to low water content of the boiler, improperly sizing the boiler
in regard to potable water heating load will result in excessive boiler
cycling and accelerated component failure. HTP DOES NOT warrant
failures caused by improperly sized boiler applications. DO NOT
oversize the boiler to the system. Modular boiler installations greatly
reduce the likelihood of boiler oversizing.

LP-517 Rev. 000 Rel. 019 Date 7.21.20
7
System Display and Operational LED Light Indicators
The display allows the user to change system parameters and
monitor system outputs.
Gas Valve
Senses suction from the blower, allowing gas to ow only if powered
and combustion air is owing.
Integrated Venturi
Controls air and gas ow into the burner.
Burner
The high grade stainless steel burner uses premixed air and gas to
provide a wide range of ring rates.
Burner Sensor
Continually monitors the temperature of the burner to provide
increased safety. Temperatures outside the allowable range will shut
down the boiler before an unsafe condition occurs.
Spark Ignition
The burner is ignited by applying high voltage through the system
spark electrode. The spark from the electrode ignites mixed gas o
of the burner.
Dual Supply Water Temperature Sensor / High Limit Water ECO
This dual sensor monitors the boiler outlet water temperature
(System Supply). The control adjusts boiler ring rate so the supply
temperature will match the boiler set point. The dual sensor meets
all requirements to function as a safety, eliminating the mechanical
ECO and increasing safety and reliability.
Return Water Temperature Sensor
This sensor monitors boiler return water temperature (System
Return).
Temperature and Pressure Gauge
Allows the user to monitor system temperature and pressure.
Electrical eld connections with terminal strips
The electrical cover allows easy access to the clearly marked line
voltage and low voltage terminal strips to facilitate wiring the boiler.
Supplied Condensate Collection System (Field Installed)
This boiler is a high eciency appliance and will produce condensate.
The condensate collection system has a oat switch which monitors
condensate level and prevents condensate from backing up into
the combustion system. Inside the collection system is a built in trap
which seals the combustion system from the connected drain. This
condensate should be neutralized to avoid damage to the drainage
system or piping.
Flow Protection
The optional ow switch is designed to protect the boiler during low
ow conditions. The boiler control also monitors ow through the
heat exchanger by monitoring the return and supply sensors and
will shut down the burner before overheating occurs.
Outdoor Sensor
The control adjusts unit set point based on the outdoor temperature
measured by this sensor to provide greater eciency.
0-10 Volt Input
Allows the installer to connect a BMS (Building Management
System) to control the boiler.
0-10 Volt Output A (Congured through Control System)
0-10 Volt Output A is congured through the boiler’s control system.
0-10 Volt Output A is related to one of the following boiler values:
boiler power, cascade power, fan speed, alarm status, or temperature
setting based on outdoor reset curve.
UL 353 Internal Low Water Cuto (LWCO)
The supplied internal Low Water Cuto meets UL 353 requirements
to function as a safety, locking out the boiler when water level is
inadequate for safe operation. To test LWCO function, press and hold
v and RESET simultaneously for ve (5) seconds. Press RESET to clear
the error code.
Boost Timer Function
This function temporarily overrides the outdoor reset curve in order
to satisfy a thermostat setpoint in a short amount of time, especially
during a relatively warm day.
Flue Temperature Modulation
As an additional safety feature, if the ue temperature exceeds
200oF, the control will modulate the boiler down based on the
vent temperature, rather than the supply temperature. If the ue
temperature exceeds 210oF the control will lock out the boiler.
System Sensor (Optional)
This sensor is designed to be used in a cascade system. The system pipe
sensor measures the temperature of return water and communicates
with the control system to modulate the ring rate of the connected
boilers.
NOTE: When using a system sensor, pipe insulation must be wrapped
around it to improve temperature measurement accuracy and increase
overall system eciency.
External Low Water Cuto (Optional)
Connection points are provided on the Field Connection Board to
install an external LWCO if required by local codes.
Indirect Tank Sensor (Optional)
Monitors storage tank temperature.
C. Optional Equipment
Optional equipment available from HTP (and Part #):
• System Sensor (7250P-324)
• Indirect Tank Sensor (7250P-325)
• High and Low Gas Pressure Switch Kit with Manual Reset
(6300P-991)
• 6” Stainless Steel Outside Termination Vent Kit (V3000)
• Flow Switch Kit (6300P-990)
• Manual Reset High Temperature Limit (6300P-998)
• Alarm System Kit (to monitor any failure) (7350P-602)
• 928 PC Connection Kit with Software (7450P-330)
• Condensate Neutralizer (7350P-611)
Part 3 - Prepare the Boiler
Remove all sides of the shipping crate to allow the boiler to be moved
into its installation location.The boiler is heavy. At least two individuals
are needed to properly handle the boiler. The boiler is also equipped
with leveling mechanisms on its casters that can be used to level the
boiler properly on an uneven location surface. If surface ooring is
rough, take care when moving the boiler into position, as catching the
casters could damage the boiler.
COLD WEATHER HANDLING - If the boiler has been stored in a very
cold location (BELOW 0oF) before installation, handle with care until
the components come to room temperature. Failure to do so could
result in damage to the boiler.
Carefully consider installation when determining boiler location.
Please read the entire manual before attempting installation. Failure
to properly take factors such as boiler venting, piping, condensate
removal, and wiring into account before installation could result in
wasted time, money, and possible property damage and personal
injury.
This boiler is certied for indoor use only. DO NOT INSTALL
OUTDOORS. Outdoor installations ARE NOT covered by warranty.
Failure to install the boiler indoors could result in property damage,
severe personal injury, or death.
A. Locating the Boiler
Incorrect ambient conditions can lead to damage to the heating
system and put safe operation at risk. Ensure that the installation
location adheres to the information included in this manual. Failure
to do so could result in property damage, serious personal injury,
or death. Failure of boiler or components due to incorrect operating
conditions IS NOT covered by product warranty.

LP-517 Rev. 000 Rel. 019 Date 7.21.20
8
Figure 1 - Removing the Boiler Shipping Crate
1. Installation Area (Mechanical Room) Operating Conditions
• Ensure ambient temperatures are higher than 32oF / 0oC and
lower than 104oF / 40oC
• Prevent the air from becoming contaminated by the products,
places, and conditions listed in this manual
• Avoid continuously high levels of humidity
• Never close existing ventilation openings
• Ensure a minimum 1” clearance around hot water and exhaust
This boiler has a condensate disposal system that may freeze
if exposed to sustained temperatures below 32oF. Precautions
should be taken to protect the condensate trap and drain lines
from sustained freezing conditions. Failure to take precautions
could result in property damage, severe personal injury, or death.
2. Check for nearby connections to:
• System water piping
• Venting connections
• Gas supply piping
• Electrical power
This boiler must be installed upright in the vertical position as
described in this manual. DO NOT attempt to install this boiler in any
other orientation. Doing so will result in improper boiler operation
and property damage, and could result in serious personal injury or
death.
vent pipes
• NOTE: To prevent condensing in the fan, it is recommended
to avoid prolonged exposure to temperatures below 45oF

LP-517 Rev. 000 Rel. 019 Date 7.21.20
9
Failure to keep the boiler area clear and free of combustible
materials, liquids, and vapors can result in substantial property
damage, severe personal injury, or death.
High heat sources (generating heat 100oF / 37oC or greater, such
as boiler ue pipes, space heaters, etc.) may damage plastic
components of the boiler as well as plastic vent pipe materials.
Such damages ARE NOT covered by warranty. It is recommended
to keep a minimum clearance of 8” from high heat sources.
Observe heat source manufacturer instructions, as well as local,
state, provincial, and national codes, laws, regulations, and
ordinances when installing this boiler and related components
near high heat sources.
The service life of the boiler’s exposed metallic surfaces, such as
the casing, as well as internal surfaces, such as the heat exchanger,
are directly inuenced by proximity to damp and salty marine
environments. In such areas higher concentration levels of
chlorides from sea spray coupled with relative humidity can lead
to degradation of boiler components. In these environments,
boilers must not be installed using direct vent systems which draw
outdoor air for combustion. Such boilers must be installed using
room air for combustion. Indoor air will have a much lower relative
humidity, and hence potential corrosion will be minimized.
Failure of the boiler or components due to incorrect operating
conditions IS NOT covered by product warranty.
4. Gas control system components must be protected from dripping
water during operation and service.
5. If the boiler is to replace an existing boiler, check for and correct
any existing system problems, such as:
• System leaks
• Location that could cause the system and boiler to freeze
and leak
• Incorrectly sized expansion tank
6. Clean and ush system when reinstalling a boiler.
NOTE: When installing in a minimum clearance location, it may
not be possible to read or view some product labeling. It is
recommended to make note of the boiler model and serial number.
Use extreme care not to drop the boiler or cause bodily injury
while lifting the boiler. Failure to follow these instructions could
result in property damage, severe personal injury, or death.
This boiler is approved for installation on combustible ooring,
but must never be installed on carpeting. Installing this boiler on
carpeting could result in re, property damage, severe personal
injury, or death.
B. Flooring
Assure that the oor and structure of the installation location
are sucient to support the full installed weight of the boiler,
including water content of the heat exchanger and related piping.
Failure to ensure the oor and structure of the installation location
are structurally sound before installation of the boiler can result
in structural failure, substantial property damage, severe personal
injury, or death.
C. Leveling
In order for the condensate to properly ow out of the collection
system, the area where you locate the boiler must be level. Location
must also fully support the weight of the lled boiler.
D. Clearances for Service Access
NOTE: If you do not provide the minimum clearances shown in Figure
4 it might not be possible to service the boiler without removing it
from the space.
NOTE: A combustible door or removable panel is acceptable front
clearance.
NOTE: In multiple boiler installations, ensure an 18” minimum
clearance is maintained between boilers.
CORRECT
INCORRECT
Figure 2 - Correct and Incorrect Leveling
All boilers eventually leak. Locate the boiler where any leakage from
the relief valve, related piping, tank, or connections will not result
in damage to surrounding areas or lower oors of the building.
Any boiler should be installed in such a manner that if it should
leak the resulting ow of water will not cause damage to the area
in which it is installed. If the boiler is installed in a location where
a leak could cause damage, it is required to provide containment
measures. Such measures include but are not limited to: a properly
sized drain pan installed beneath the boiler and piped to an open
drain line, or installing the boiler on a concrete oor pitched to a free
owing drain. Failure to provide containment measures is the sole
responsibility of the owner and/or installer. Leakage damages ARE
NOT covered by warranty.
In addition, water leak detection devices and automatic water shuto
valves are readily available at plumbing supply houses. IT IS HIGHLY
RECOMMENDED BY THE MANUFACTURER TO INSTALL WATER LEAK
DETECTION DEVICES AND AUTOMATIC SHUTOFF VALVES IN ANY
BOILER INSTALLATION WHERE A LEAKAGE OF WATER COULD RESULT
IN PROPERTY DAMAGES.
• Condensate drain
3. Check area around boiler. Remove any combustible materials,
gasoline, and other ammable liquids.

LP-517 Rev. 000 Rel. 019 Date 7.21.20
10
Figure 3 - Correct and Incorrect Leveling
Figure 4 - Recommended Service Clearances
NOTE: In multiple boiler installations, ensure an 18”minimum clearance is maintained between boilers.
Precautions
If the boiler is located in a residential garage, per ANSI Z223.1:
• Install the boiler burner and ignition devices a minimum of 18” above the oor of the garage. This will ensure the burner and ignition
devices are well o the oor.
• When raising the boiler ensure the entire bottom and fully lled weight of the boiler are fully supported.
• Locate or protect the boiler so it cannot be damaged by a moving vehicle.
E. Residential Garage and Closet Installations
CAUTION
Check with your local Authority Having Jurisdiction for requirements when installing the boiler in a garage or closet. Please read the entire
manual before attempting installation. Failure to properly take factors such as venting, piping, condensate removal, and wiring into account
before installation could result in wasted time, money, and possible property damage and personal injury.
The space must be provided with combustion / ventilation air openings correctly sized for all other appliances located in the same space
as the boiler. The boiler cover must be securely fastened to prevent the boiler from drawing air from the boiler room. This is particularly
important if the boiler is in a room with other appliances. Failure to comply with the above warnings could result in substantial property
damage, severe personal injury, or death.