HTP MODCON1000, MODCON1700 Installation, Start-up And Maintenance Instructions

Installation

Start-Up

Maintenance

Parts

Warranty

Mod Con

MODCON1000 / MODCON1700

“LP” Denotes Propane Gas Operation

“HL” Denotes Installed High and Low Gas

Pressure Switches

This Manual For Use With Boilers Manufactured After

August 13, 2013

Heat Exchanger Bears the ASME “H” Stamp

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.

Improper installation, adjustment, alteration, service, or maintenance could void product warranty and cause
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-428 Rev. 6.6.16

2

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. DO NOT STORE GASOLINE OR OTHER FLAMMABLE
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.

LP-428 Rev. 6.6.16

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 Code for the Installation of Heat Producing

Appliances and 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.

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

3

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.

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.

Code for the Installation of Heat Producing Appliances (latest

version) from American Insurance Association, 85 John Street,
New York, NY 11038.

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.

LP-428 Rev. 6.6.16

4

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 926
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.

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.

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.

Table of Contents

Part 1 - General Safety Information 5

A. Improper Combustion 6
B. Gas 6
C. When Servicing the Water Heating System 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 8
B. Flooring 9
C. Leveling 9
D. Clearances for Service Access 9
E. Residential Garage and Closet Installations 9
F. Exhaust Vent and Intake Pipe 10

1. Direct Vent of Exhaust and Intake 11

2. Indoor Combustion Air in Conned or Unconned Space

11
G. Prevent Combustion Air Contamination 11
H. Removing a Boiler from a Common Vent System 11
I. Water Chemistry Requirements* 12

Part 4 - Piping 13

A. General Plumbing Information 13
B. Relief Valve 14
C. Backow Preventer 14
D. Expansion Tank 14
E. Circulators 14
F. Hydronic Piping with Circulators, Zone Valves, and
Multiple Boilers 15
G. Circulator Sizing 15
H. Check / Control Water Chemistry 17
I. Plumbing 17
J. Fill and Purge Heating System 17
K. Freeze Protection Fluids 18
L. Zoning with Zone Valves 18
M. Zoning with Circulators 18

LP-428 Rev. 6.6.16

5

N. Multiple Boilers 18
O. Applications 19

Part 5 - Venting and Condensate Removal 23

A. General 23

B. Approved Materials for Exhaust Vent and Intake Pipe 24

C. Additional Requirements for Installation in Canada 24
D. Exhaust Vent and Intake Pipe Location 25
E. Exhaust Vent and Intake Pipe Sizing 26
F. Exhaust Vent and Intake Pipe Installation 26
G. Applications 27

1. Direct Vent Installation of Exhaust and Intake 27

2. Room and Indoor Combustion Ventilation Requirements
29

H. Condensate Removal System 30

Part 6 - Wiring 31

A. Installation Must Comply With 31
B. Field Wiring Terminations 31
C. Field Wiring 31
D. Line Voltage Wiring 32
E. Alarm Connections (Top Boiler Connection) 32
F. Low Voltage Connections for Standard Boiler 32
G. Thermostat 32
H. Outdoor Sensor 32
I. Indirect Sensor (Top Boiler Connection) 32
J. Optional 0-10 Volt Building Control Signal 32
K. Optional High Gas Pressure Switch 33
L. Optional Low Gas Pressure Switch 33
M. Optional Flow Switch 34
N. Optional UL353 Low Water Cut-O Interface Kit 35
O. Wiring of Cascade System Communication Bus 35

Part 7 - Gas Connections 36

A. Gas Piping 36
B. Gas Table 37
C. Check Inlet Gas Pressure 37
D. Boiler Gas Valve 38

Part 8 - Start-Up Preparation 39

A. Check / Control Water Chemistry 39
B. Check for Gas Leaks 39
C. Freeze Protection (When Used) 39
D. Condensate Removal 39
E. Fill and Test Water System 40
F. Purge Air from Water System 40
G. Check Thermostat Circuit(s) 40
H. Condensate Removal 41
I. Final Checks Before Starting Boiler 41

J. Cascade System - MODCON1000 and 1700 Models 41

Part 9 - Start-Up Procedure 42

A. Control Overview 42
B. Navigation of the Display 42
C. Operating Instructions 42
D. Programming Boiler Settings 43
E. Programming the System Setting 43
F. System Setting Program Navigation 43
G. Resetting the Maintenance Schedule 46

Part 10 - Start-Up Procedures for the Installer 46

A. Boiler Control Status Menu 46
B. Cascade Menu 48
C. Boiler Test Mode 49

Part 11 - Troubleshooting 49

A. Boiler Error and Fault Codes 49

B. Boiler Error 49
C. Boiler Fault 49
D. User Interface Display 50

Part 12 - Maintenance 55

A. Procedures 55
B. Combustion Chamber Coil Cleaning Instructions 55
C. Cleaning Water Side of Heat Exchanger 56

Part 13 - Installation Checklist 62
Part 14 - Maintenance Report 62

Limited Warranty 66
Maintenance Notes 68
Customer Installation Record Form 69

Part 1 - General Safety Information

This boiler is approved for indoor installations only. Clearance to
combustible materials: 0” top, bottom, sides, and back. Left side
has all boiler mechanical connections. Boiler must have room for
service: 24” front is minimum recommended service clearance.
(A combustible door or removable panel is acceptable front
clearance.) This boiler has been approved for closet installation
and installation on combustible ooring. Do not install directly 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.

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 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.

LP-428 Rev. 6.6.16

6

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.

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.
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.

• 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 make­up water can cause internal corrosion in system
components. Leaks in the boiler or piping must be
repaired at once.

• NOTE: DO NOT add cold make up water to the system
when the boiler is hot. Thermal shock can potentially
cause cracks in the heat exchanger. Such damage IS
NOT covered by warranty.

E. Freeze Protection

NOTE: Consider piping and installation when determining
boiler location.

Failure of the boiler due to freeze related damage IS NOT
covered by product warranty.

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 Water Heating System

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.

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.

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.

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.

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.

Part 2 - Before You Start

A. What’s in the Box

Remove all sides of the shipping crate of the boiler.
Components included with the boiler:

• Temperature and Pressure Gauge

• Outdoor Sensor

• Installation Manual and Warranty

• User’s Information Manual

• CSD-1 Form

• H-3 Data Sheet

B. How the Boiler Operates

Mod Con boilers are designed to meet the needs of the most
challenging new and retrot installations. Mod Con 1000 and
1700 models incorporate two individual heating systems that
are piped, wired, and programmed to work as one, providing
built-in system redundancy and maximum turndown and
eciency. Outlined below are features of the system and how

LP-428 Rev. 6.6.16

each operates.

Stainless Steel Heat Exchanger

The highly ecient stainless steel 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, controlling the output of each boiler and
staging the individual heating circuits to maximize overall
eciency. This allows the Mod Con to deliver only the amount
of heat energy required and nothing more. The system can be
further enhanced by installing with 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 has an individual pump.

Text 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 (1000 Models) or Swirl Plate (1700
Models)

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.

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.

Supply Water Temperature Sensor

This 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.

Return Water Temperature Sensor

This sensor monitors boiler return water temperature (System
Return).

System Sensor

This sensor is mounted in the boiler common piping and
monitors the water temperature of the outlet of both boilers
simultaneously. The master boiler uses this sensor as its
primary feedback to control the outlet water temperature of a
cascaded boiler system.

7

NOTE: When using a system sensor, pipe insulation must be
wrapped around it to improve temperature measurement
accuracy and increase overall system eciency.

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.

Condensate Collection System

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.

0-10 Volt Input

Allows the installer to connect a BMS (Building Management
System) to control the boiler.

Integrated System Sensor

The system sensor measures the temperature of return water
and communicates with the control system to modulate the
ring rate of the connected boilers.

Outdoor Sensor

This sensor monitors outdoor temperature. Data from this
sensor is monitored by the control, which adjusts the boiler set
point to provide greater eciency.

Flow Protection (optional)

The optional ow switch is designed to protect the boiler in the
event of 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.

Indirect Tank Sensor (optional)

Monitors storage tank temperature.

C. Optional Equipment

Optional equipment available from HTP (and Part #):

• Remote System Sensor (7250P-324)

• Indirect Tank Sensor (7250P-325)

• 6” Stainless Steel Vent Termination Kit (V3000)

• High and Low Gas Pressure Switch Kit with Manual Reset

(7350P-600 - Two [2] are Required)

• UL 353 Compliant Low Water Cut-O Interface Kit with
Manual Reset (7350P-601 - Two [2] are Required)

• Alarm System (to monitor any failure) (7350P-602 - Top
Boiler Only)

• PC Connection Kit (7250P-320)

• Condensate Neutralizer (7350P-611)

• Caster Kit (7350p-227)

• Flow Switch Kit (7350P-605 - Two [2] are Required)

• Stainless to PVC Vent Adapter (6” - 7350P-275, 8” - 7350P-

375)

• Intake and Exhaust Screens (6” - SSV6.6, 8” - SSV8.6)

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 also equipped
with leveling feet that can be used to level the boiler properly on
an uneven location surface. If surface ooring is rough, take care

LP-428 Rev. 6.6.16

8

when moving the boiler into position, as catching the leveling
feet 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.

A. Locating the Boiler

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.
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.

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.

1. Installation Area (Mechanical Room) Operating Conditions

• Ensure ambient temperatures are higher than 32
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 vent pipes

• NOTE: To prevent condensing in the fan, it is recommended
to avoid prolonged exposure to temperatures below 45

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

o

F / 0oC

o

• Condensate drain

3. Check area around boiler. Remove any combustible materials,
gasoline, and other ammable liquids.

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.

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.
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.
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. The boiler
should be located near a oor drain or installed in a drain pan.
Leakage damages ARE NOT covered by warranty.
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

F

6. Clean and ush system when reinstalling a boiler.

NOTE: This boiler must be installed within the prescribed
clearances. If local building codes require additional clearance,
these codes supersede HTP’s. It is recommended to make
note of the boiler model and serial number before nalizing
installation.

The boiler is extremely heavy. Use extreme care not to drop the
boiler or cause bodily injury while lifting. Failure to follow these
instructions could result in property damage, severe personal
injury, or death.

LP-428 Rev. 6.6.16

Gas conversion should be performed BEFORE the boiler is
installed. Carefully follow the gas conversion instructions
when performing the conversion. Failure to follow these
instructions could result in 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.

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.

C. Leveling

9

NOTE: A combustible door or removable panel is acceptable
front clearance.

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.

All boilers eventually leak. It is recommended to install a catch
pan beneath the boiler. This catch pan should be sized with a
maximum depth of 2”, and a minimum diameter 2” greater than
the diameter of the boiler. The catch pan should empty into
an open drain line. This drain line should be 3/4” ID minimum,
piped to an open drain. Failure to follow these instructions could
result in property damage. Such damages ARE NOT covered by
product warranty.

E. Residential Garage and Closet Installations

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.

NOTE: It is recommended that the boiler be installed on
a 4 - 6” raised boiler pad rated for the weight of the fully
operational boiler and related piping. If ooding is a concern,
it is recommended to further elevate the boiler pad to prevent
water from reaching the boiler.

D. Clearances for Service Access

NOTE: If you do not provide the minimum clearances shown
in Figure 2 it might not be possible to service the boiler
without removing it from the space.

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.

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.

Figure 1 - Correct and Incorrect Leveling

LP-428 Rev. 6.6.16

10

Figure 2 - Recommended Service Clearances

• 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.

The space must be provided with correctly sized combustion/
ventilation air openings for all other appliances located in the
space with the boiler. For power venting installations using
room air for combustion, refer to the venting section, this
manual, for descriptions of conned and unconned spaces.
Do not install the boiler in an attic. Failure to comply with these
warnings could result in substantial property damage, severe
personal injury, or death.

F. Exhaust Vent and Intake Pipe

The boiler is rated ANSI Z21.13 Category IV (pressurized vent,
likely to form condensate in the vent) and requires a special vent
system designed for pressurized venting.

NOTE: The venting options described here (and further
detailed in the Venting section, this manual) are the lone
venting options approved for this boiler. Failure to vent the
boiler in accordance with the provided venting instructions
will void the warranty.

Vents must be properly supported. Boiler exhaust and intake
connections are not designed to carry heavy weight. Vent
support brackets must be within 1’ of the boiler and the
balance at 4’ intervals. Boiler must be readily accessible for
visual inspection for rst 3’ from the boiler. Failure to properly
support vents could result in property damage, severe
personal injury, or death.
The exhaust discharged by this boiler may be very hot. Avoid
touching or other direct contact with the exhaust gases of the
vent termination assembly. Doing so could result in severe
personal injury or death.

Failure to vent the boiler properly will result in serious personal
injury or death.

Do not attempt to vent this boiler by any means other than
those described in this manual. Doing so will void the warranty
and may result in severe personal injury or death.

LP-428 Rev. 6.6.16

1. Direct Vent of Exhaust and Intake

If installing a direct vent option, combustion air must be
drawn from the outdoors directly into the boiler intake and
exhaust must terminate outdoors. There are three basic direct
vent options detailed in this manual: 1. Side Wall Venting, 2.
Roof Venting, and 3. Unbalanced Venting.
Be sure to locate the boiler such that the exhaust vent and
intake piping can be routed through the building and properly
terminated. Dierent vent terminals can be used to simplify
and eliminate multiple penetrations in the building structure
(see Optional Equipment in Venting Section). The exhaust
vent and intake piping lengths, routing, and termination
methods must all comply with the methods and limits given
in the Venting Section, this manual.
When installing a combustion air intake from outdoors, care
must be taken to utilize uncontaminated combustion air. To

prevent combustion air contamination, see Table 1.

2. Indoor Combustion Air in Conned or Unconned Space

This boiler requires fresh, uncontaminated air for safe
operation and must be installed in a mechanical room where
there is adequate combustion and ventilating air. NOTE: To

prevent combustion air contamination, see Table 1.

Combustion air from the indoor space can be used if the space
has adequate area or when air is provided through a duct
or louver to supply sucient combustion air based on the
boiler input. Never obstruct the supply of combustion air to
the boiler. If the boiler is installed in areas where indoor air
is contaminated (see Table 1) it is imperative that the boiler
be installed as direct vent so that all combustion air is taken
directly from the outdoors into the boiler intake connection.
Unconned space is space with volume greater than 50
cubic feet per 1,000 BTU/hr (4.8 cubic meters per kW) of the
total input rating of all fuel-burning appliances installed in
that space. Rooms connected directly to this space through
openings not furnished with doors are considered part of the
space. See Venting Section for details.
Conned space is space with volume less than 50 cubic feet
per 1,000 BTU/hr (4.8 cubic meters per kW) of the total input
rating of all fuel-burning appliances installed in that space.
Rooms connected directly to this space through openings not
furnished with doors are considered part of the space.
When drawing combustion air from inside a conventionally
constructed building to a conned space, such space should
be provided with two permanent openings: one located 6”
(15 cm) below the space ceiling, the other 6” (15cm) above
the space oor. Each opening should have a free area of one

2

square inch per 1,000 BTU/hr (22cm

/kW) of the total input of
all appliances in the space, but not less than 100 square inches
(645cm2).
If the conned space is within a building of tight construction,
air for combustion must be obtained from the outdoors as
outlined in the Venting section of this manual.

When drawing combustion air from the outside into the
mechanical room, care must be taken to provide adequate
freeze protection.

11

Failure to provide an adequate supply of fresh combustion air can
cause poisonous ue gases to enter the living space, resulting
in severe personal injury or death. To prevent combustion air
contamination, see Table 1.

G. Prevent Combustion Air Contamination

Install intake air piping for the boiler as described in the Venting
Section, this manual. Do not terminate exhaust in locations that
can allow contamination of intake air.

Ensure that the intake air will not contain any of the contaminants
in Table 1. Contaminated air will damage the boiler, resulting in
possible substantial property damage, severe personal injury, or
death. For example, do not pipe intake air near a swimming pool
or laundry facilities. These areas always contain contaminants.

Products to Avoid

Spray cans containing
uorocarbons

Permanent wave solutions Swimming pools

Chlorinated waxes / cleaners Metal fabrication plants

Chlorine-based swimming pool
chemicals

Calcium chloride used for thawing Refrigeration repair shops

Sodium chloride used for water
softening

Refrigerant leaks Auto body shops

Paint or varnish removers Plastic manufacturing plants

Hydrochloric or Muriatic acid

Cements and glues New building construction

Antistatic fabric softeners used in
clothes dryers

Chlorine-type bleaches, laundry
detergents, and cleaning solvents

Adhesives used to fasten building
products

Table 1 - Products and Areas Likely to Have Contaminants

Areas Likely to Have

Contaminants

Dry cleaning / laundry areas and

establishments

Beauty shops

Photo processing plants

Furniture renishing areas and

establishments

Remodeling areas

Garages and workshops

NOTE: DAMAGE TO THE BOILER CAUSED BY EXPOSURE
TO CORROSIVE VAPORS IS NOT COVERED BY WARRANTY.

(Refer to the limited warranty for complete terms and
conditions.)

H. Removing a Boiler from a Common Vent System

Do not install the boiler into a common vent with any other
appliance. This will cause ue gas spillage or appliance
malfunction, resulting in possible substantial property damage,
severe personal injury, or death.

Failure to follow all instructions can result in ue gas spillage
and carbon monoxide emissions, causing severe personal injury
or death.

LP-428 Rev. 6.6.16

12

When removing an existing boiler, follow the steps below.

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

2. Visually inspect the venting system for proper size and
horizontal pitch to determine if there is blockage, leakage,
corrosion, or other deciencies that could cause an unsafe
condition.

3. If practical, close all building doors, windows, and doors
between the space in which the boiler remains connected to
the common venting system and other spaces in the building.
Turn on clothes dryers and any appliances not connected to
the common venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, at maximum speed. Do
not operate a summer exhaust fan. Close all replace dampers.

4. Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust the thermostat so the appliance will
operate continuously.

5. Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the ame of a match or
candle or smoke from a cigarette.

6. After it has been determined that each appliance remaining
connected to the common venting system properly vents
when tested as outlined, return doors, windows, exhaust fans,
replace dampers, and any other gas burning appliances to their
previous condition of use.

7. Any improper operation of the common venting system
should be corrected to conform to the National Fuel Gas Code,
ANSI Z223.1. When resizing any portion of the common venting
system, the system should approach the minimum size as
determined using the appropriate tables in Appendix G of ANSI
Z223.1.

I. Water Chemistry Requirements*

Chemical imbalance of the water supply may aect eciency
and cause severe damage to the boiler and associated
equipment. HTP recommends having water quality
professionally analyzed to determine whether it is necessary
to install a water softener. It is important that the water
chemistry on both the domestic hot water and central heating
sides are checked before installing the boiler, as water quality
will aect the reliability of the system. In addition, operating
temperatures above 140oF will cause the boiler to operate
continuously, accelerating the build-up of lime scale and
possibly shortening the service life of the boiler. Failure of a
boiler due to lime scale build-up, low pH, or other chemical
imbalance IS NOT covered by the warranty.

• Sodium less than 20 mGL

• Water pH between 6.0 and 8.0

• Maintain water pH between 6.0 and 8.0. Check with

litmus paper or have it chemically analyzed by water
treatment company.

• If the pH diers from above, consult local water
treatment for treatment needed.

• Hardness less than 7 grains

• Consult local water treatment companies for

unusually hard water areas (above 7 grains hardness).

• Chlorine concentration less than 100 ppm

• Using chlorinated fresh water should be acceptable

as levels are typically less than 5 ppm.

• Do not connect the boiler to directly heat swimming
pool or spa water.

• Do not ll boiler or operate with water containing
chlorine in excess of 100 ppm.

*NOTE: It is recommended to clean the heat exchanger at
least once a year to prevent lime scale buildup. To clean the
heat exchanger, follow the maintenance procedure in this
manual.

Hardness: Less than 7 grains
Chloride levels: Less than 100 ppm
pH levels: 6 - 8
TDS: Less than 2000 ppm
Sodium: Less than 20 mGL

Figure 3 - CO Warning Label

LP-428 Rev. 6.6.16

13

Figure 4 - Boiler Dimensions - NOTE: All Dimensions Are Approximate

Part 4 - Piping

Failure to follow the instructions in this section WILL VOID the
warranty and may result in property damage, severe personal
injury, or death.

Dielectric unions or galvanized steel ttings must not be used
in a system with this boiler. Doing so WILL VOID the warranty.
Use only copper, brass, or stainless steel ttings. Teon thread
sealant must be used on all connections.
DO NOT pipe this boiler with black iron, galvanized steel,
steel, or lead pipe. Doing so will result in premature product
failure and property damage, and WILL VOID the warranty.

Plumbing of this product should only be done by a qualied,
licensed plumber in accordance with all local plumbing codes.
The boiler may be connected to an indirect water heater to
supply domestic hot water. HTP oers indirect water heaters
in stainless steel or glass-lined construction.

A. General Plumbing Information

The building piping system must meet or exceed the the piping
requirements in this manual.

The control module uses temperature sensors to provide both
high limit protection and modulating temperature control. The
control module also provides low water protection by sensing
the water level in the heat exchanger. Some codes/jurisdictions
may require additional external controls..
Use two wrenches when tightening water piping at boiler. Use
one wrench to prevent the boiler return or supply line from
turning. Failure to prevent piping connections from turning
could cause damage to boiler components.
All piping methods shown in this manual use primary / secondary
connection to the boiler loop. This is to avoid the possibility of
inadequate ow through the boiler. For other piping methods,
consult your local HTP representative, or refer to Boiler Piping
Details in this manual.

NOTE: The addition of a high temperature limiting device is
important if the boiler is to be connected to a domestic hot
water system.

LP-428 Rev. 6.6.16

14

B. Relief Valve

Connect discharge piping to a safe disposal location following
the guidelines below.

To avoid water damage or scalding due to relief valve operation:

• Discharge line must be connected to relief valve outlet
and run to a safe place of disposal. Terminate the
discharge line in a manner that will prevent possibility of
severe burns or property damage should the relief valve
discharge.

• Discharge line must be as short as possible and the same
size as the valve discharge connection throughout its
entire length.

• Discharge line must pitch downward from the valve
and terminate at least 6” above the oor drain, making
discharge clearly visible.

• The discharge line shall terminate plain, not threaded,
with a material serviceable for temperatures of 375oF or
greater.

• Do not pipe discharge to any location where freezing
could occur.

• No valve may be installed between the relief valve and
boiler or in the discharge line. Do not plug or place any
obstruction in the discharge line.

• Test the operation of the relief valve after lling and
pressurizing the system by lifting the lever. Make sure
the valve discharges freely. If the valve fails to operate
correctly, immediately replace with a new properly rated
relief valve.

• Test T&P valve at least once annually to ensure the
waterway is clear. If valve does not operate, turn the
boiler “o” and call a plumber immediately.

• Take care whenever operating relief valve to avoid
scalding injury or property damage.

FAILURE TO COMPLY WITH THE ABOVE GUIDELINES
COULD RESULT IN FAILURE OF RELIEF VALVE OPERATION,
RESULTING IN POSSIBILITY OF SUBSTANTIAL PROPERTY
DAMAGE, SEVERE PERSONAL INJURY, OR DEATH.
Do not thread a cap or plug into the relief valve or relief valve
line under any circumstances! Explosion and property damage,
serious injury, or death may result.

RE-INSPECTION OF T&P RELIEF VALVES: T&P valves should
be inspected AT LEAST ONCE EVERY THREE YEARS, and
replaced if necessary, by a licensed plumbing contractor or

qualied service technician to ensure that the product has not
been aected by corrosive water conditions and to ensure that
the valve and discharge line have not been altered or tampered
with illegally. Certain naturally occuring conditions may corrode
the valve and its components over time, rendering the valve
inoperative. Such conditions can only be detected if the valve
and its components are physically removed and inspected.

Do not attempt to conduct an inspection on your own.

Contact your plumbing contractor for a re-inspection to assure
continued safety.

FAILURE TO RE-INSPECT THE T&P VALVE AS DIRECTED
COULD RESULT IN UNSAFE TEMPERATURE AND/OR
PRESSURE BUILD-UP WHICH CAN RESULT IN PROPERTY
DAMAGE, SERIOUS PERSONAL INJURY, OR DEATH.

C. Backow Preventer

Use a backow preventer specically designed for boiler
installations. This valve should be installed on the cold water
ll supply line per local codes.

D. Expansion Tank

Expansion Tank and Make-Up Water

1. Ensure that the expansion tank is sized to correctly handle
boiler and system water volume and temperature.

Expansion tanks must be sized according to total system
volume. This includes all length of pipe, all xtures, boilers,
etc. Failure to properly size for system expansion could result
in wasted time, money, possible property damage, serious
injury, or death.

Undersized expansion tanks cause system water to be lost
from the relief valve, causing make-up water to be added.
Eventual boiler failure can result due to excessive make­up water addition. SUCH FAILURE IS NOT COVERED BY

WARRANTY.
DO NOT install automatic air vents on closed type expansion

tank systems. Air must remain in the system and return to the
tank to provide an air cushion. An automatic air vent would
cause air to leave the system, resulting in improper operation
of the expansion tank.

Expansion Tank Sizing

Model Heat Exchanger Volume (Gallons)

MODCON1000 8.4

MODCON1700 11.6

Table 2 - ModCon Heat Exchanger Volume

2. The expansion tank must be located as shown in
Applications, this manual, or following recognized design
methods. See expansion tank manufacturer’s instructions for
details. Always install an expansion tank designed for potable
water systems.

3. Connect the expansion tank to the air separator only if the
separator is on the suction side of the circulator. Always install
the system ll connection at the same point as the expansion
tank connection to the system.

4. Most chilled water systems are piped using a closed type
expansion tank.

Diaphragm (or Bladder) Expansion Tank

Always install an automatic air vent on top of the air separator
to remove residual air from the system.

E. Circulators

DO NOT use the boiler circulator in any location other than
the ones shown in this manual. The boiler circulator location
is selected to ensure adequate ow through the boiler.
Failure to comply with this caution could result in unreliable
performance and nuisance shutdowns from insucient ow.

Sizing Space Heat System Piping

1. In all diagrams, the space heating system is isolated from
the boiler loop by the primary / secondary connection.

LP-428 Rev. 6.6.16

2. Size the piping and components in the space heating system
using recognized design methods.

F. Hydronic Piping with Circulators, Zone Valves, and
Multiple Boilers

The boiler is designed to function in a closed loop hydronic
system. The included temperature and pressure gauge allows
the user to monitor system pressure and outlet temperature
from the boiler. It is important to note that the boiler has a
minimal amount of pressure drop that must be calculated
when sizing the circulators. Each boiler installation must have
an air elimination device that will remove air from the system.
Install the boiler so the gas ignition system components
are protected from water (dripping, spraying, etc.). Allow
clearance for basic service of the boiler circulator, valves, and
other components. Observe minimum 1” clearance around all
uninsulated hot water pipes when openings around pipes are
not protected by non-combustible materials.
On a boiler installed above radiation level, some states and
local codes require a low water cut o device. This is provided
standard on the ModCon boiler. Check with local codes for
additional requirements. If the boiler supplies hot water to
heating coils in air handler units, ow control valves or other
devices must be installed to prevent gravity circulation of
boiler water in the coils during the cooling cycle. Chilled water
medium must be piped in parallel with the boiler.
Freeze protection for new or existing systems must use glycol
specically formulated for this purpose. This glycol must
include inhibitors that will prevent it from attacking metallic
system components. Make certain that the system uid is
checked for the correct glycol concentration and inhibitor
level. The system should be tested at least once a year and
as recommended by the producer of the glycol solution.
Allowance should be made for the expansion of the glycol
solution in the system piping. Example: 50% by volume glycol
solution expands 4.8% in volume for the temperature increase
from 32oF to 180oF, while water expands 3% over the same
temperature rise.

15

Never use dielectric unions or galvanized steel ttings when
connecting to a stainless steel storage tank or boiler. Failure
to follow this instruction can lead to premature failure of the
boiler system. Such failures ARE NOT covered by warranty.
The boiler should not be operated as a potable hot water
heater. The boiler should not be used as a direct hot water
heating device.

G. Circulator Sizing

In addition, the boiler heat exchanger has a minimum total
water volume that must be taken into account when sizing
the circulator. Minimum boiler ow rates are listed in the table
below.

Minimum Boiler Flow Rates

Model Minimum Flow (GPM)

MODCON1000 66

MODCON1700 109

Table 3 - Minimum Flow Rates

LP-428 Rev. 6.6.16

16

The boiler heat exchanger does have a pressure drop which must be considered in system design. Refer to the graph in Table 4
for pressure drop through the boiler heat exchanger.

Table 4 - Heat Exchanger Pressure Drop

The chart below represents various system design temperature rise through the boiler along with respective ows and friction
loss. This is provided to aid in circulator selection.

System Temperature Rise Chart

20°Δt 25°Δt 30°Δt

Model Friction Ft Flow Rate (GPM) Friction Ft Flow Rate (GPM) Friction Ft Flow Rate (GPM)

MODCON1000 19’ 100 11’ 80 8’ 66

MODCON1700 35’ 170 26’ 130 18’ 109

Table 6 - Temperature Rise, Friction Ft, and Flow Rate

The chart below represents the combined ow rates and pipe sizes when using multiple boilers to design the manifold system
for the primary circuit. To size, simply add the number of boilers and the required ow rates for the system design temperature.

Table 5 - Multiple Boiler Manifold Piping

LP-428 Rev. 6.6.16

17

H. Check / Control Water Chemistry

NOTE: Boiler failure due to improper water chemistry is not
covered by warranty.
Water Chemistry*

• Sodium less than 20 mGL

• Water pH between 6.0 and 8.0

• Maintain water pH between 6.0 and 8.0. Check with

litmus paper or have it chemically analyzed by water
treatment company.

• If the pH diers from above, consult local water
treatment for treatment needed.

• Hardness less than 7 grains

• Consult local water treatment companies for

unusually hard water areas (above 7 grains hardness).

• Chlorine concentration less than 100 ppm

• Using chlorinated fresh water should be acceptable

as levels are typically less than 5 ppm.

• Do not connect the boiler to directly heat swimming
pool or spa water.

• Do not ll boiler or operate with water containing
chlorine in excess of 100 ppm.

*NOTE: It is recommended to clean the heat exchanger at
least once a year to prevent lime scale buildup. To clean the
heat exchanger, follow the maintenance procedure in this
manual.

Hardness: Less than 7 grains
Chloride levels: Less than 100 ppm
pH levels: 6 - 8
TDS: Less than 2000 ppm
Sodium: Less than 20 mGL

Clean system to remove sediment*

1. You must thoroughly ush the system (without boiler
connected) to remove sediment. The high-eciency heat
exchanger can be damaged by buildup or corrosion due to
sediment.

2. For zoned systems, ush each zone separately through
a purge valve. (If purge valves and isolation valves are not
already installed, install them to properly clean the system.)

3. Flush system until water runs clean and you are sure piping
is free of sediment.
*NOTE: It is recommended you clean heat exchanger at
least once a year to prevent lime scale buildup. Follow the
maintenance procedure to clean the heat exchanger in the
Maintenance Section of this manual.

Test/replace freeze protection uid

1. For systems using freeze protection uids, follow uid
manufacturer’s instructions to verify inhibitor level and that
other uid characteristics are satisfactory.

2. Freeze protection uid must be replaced periodically
due to degradation of inhibitors over time. Follow all uid
manufacturer instructions.

Piping Components
Heating System Piping

System piping MUST be sized per technical pipe requirements
listed in Table 6. Reducing pipe size can restrict ow rate

through the boiler, causing inadvertent short cycling and poor
system performance.

Check Valves

Field supplied. Check valves are recommended for installation
as shown in Applications.

Isolation Valves

Field supplied. Full port ball valves are required. Failure to use
full port ball valves could result in a restricted ow rate through
the boiler.

Anti-Scald Mixing Valve

Field supplied. An anti-scald mixing valve is recommended when
storing domestic hot water above 115°F.

Unions

Field supplied. Recommended for unit serviceability. DO
NOT USE DIELECTRIC UNIONS! ONLY BRASS, COPPER, OR
STAINLESS STEEL.

Pressure Relief Valve

Factory supplied on boiler. The pressure relief valve is sized to
ASME specications. Storage tank may require additional relief
valves depending on local codes.

I. Plumbing

This boiler should not be operated as a potable hot water heater.
It should not be used as a direct hot water heating device.

Basic steps are listed below that will guide the installation of the
boiler.

1. Connect the system return marked “Boiler Return”.

2. Connect the system supply marked “Boiler Supply”.

3. Install purge and balance valve or shut o valve and drain on
system return to purge air out of each zone.

4. Install a back ow preventer on the cold feed make-up water
line.

5. Install a pressure reducing valve on the cold feed make­up water line (15 PSI nominal on the system return). Check
temperature and pressure gauge when operating. It should read
a minimum pressure of 12 PSI.

6. Install a circulator as shown in piping details (this section).
Make sure the circulator is properly sized for the system and
friction loss.

7. Install an expansion tank on the system supply. Consult
the tank manufacturer’s instructions for specic information
relating to expansion tank installation. Size the expansion tank
for the required system volume and capacity.

8. Install an air elimination device on the system supply.

9. Install a drain valve at the lowest point of the system. NOTE:
The boiler cannot be drained completely of water without
purging the unit with an air pressure of 15 PSI.

10. The relief valve is installed at the factory. A pipe discharge
line should be installed to discharge 6” above the drain in the
event of pressure relief. The pipe size must be the same size as
the relief valve outlet. NEVER BLOCK THE OUTLET OF THE

SAFETY RELIEF VALVE.

J. Fill and Purge Heating System

• Attach the hose to balance and purge hose connector or
drain valve and run hose to nearest drain.

• Close the other side of the balance and purge valve or the
shut o valve after the drain.

• Open rst zone balance and purge or drain valve to let

LP-428 Rev. 6.6.16

18

water ow out the hose. If zone valves are used, open the
valves one at a time manually. (NOTE: You should check
the valve manufacturer’s instructions prior to opening
valves manually, so as not to damage the valves.)

• Manually operate ll valve regulator. When water runs
out of the hose, you will see a steady stream of water
(without bubbles). Close balance and purge valve or drain
to stop the water from owing. Disconnect the hose and
connect it to next zone to be purged.

• Repeat this procedure for additional zones (one at a
time).

For installation that incorporates standing iron radiation and
systems with manual vents at the high points, follow previous
section and, starting with the nearest manual air vent, open
until water ows out. Then close vent. Repeat procedure,
working your way toward the furthest air vent. It may be
necessary to install a basket strainer in an older system where
larger amounts of sediment may be present. Annual cleaning of
the strainer may be necessary.

Upon completion, make sure that the ll valve is in the automatic
position and each zone balance and purge or shut o is in an
open position and zone valves are positioned for automatic
operation.

K. Freeze Protection Fluids

L. Zoning with Zone Valves

1. When zoning with zone valves, connect the boiler to the
system as shown in Applications. The primary/secondary
piping shown ensures the boiler loop will have sucient ow.
It also avoids applying the high head of the boiler circulator to
the zone valves.

2. Connect DHW (domestic hot water) piping to indirect
storage water heater as shown in Applications.

M. Zoning with Circulators

1. When using circulator zoning, connect the boiler to the
system as shown in Applications. NOTE: The boiler circulator
cannot be used for a zone. It must only supply the boiler loop.

2. Install a separate circulator for each zone.

3. Connect DHW (domestic hot water) piping to indirect
storage water heater as shown in Applications.

N. Multiple Boilers

1. Connect multiple boilers as shown in Applications.

2. All piping shown is reverse return to assure balanced ow
throughout the connected boilers.

3. Each connected boiler must have its own circulator pump to
assure adequate ow.

4. Connect DHW (domestic hot water) piping to indirect
storage water heater as shown in Applications.

5. The system ow (secondary loop) must be greater than the
boiler’s primary loop ow.

Use only inhibited glycol solutions which are specially
formulated for hydronic systems. Ethylene glycol is toxic and
can attack gaskets and seals used in hydronic systems. Glycol
mixtures should not exceed 50%.

1. Glycol in hydronic applications is specially formulated for this
purpose, and includes inhibitors that prevent the glycol from
attacking metallic system components. Make certain that the
system uid is checked for the correct glycol concentration and
inhibitor level.

2. The glycol solution should be tested at least once a year and
as recommended by the glycol manufacturer.

3. Anti-freeze solutions expand more than water. For example:
A 50% by volume solution expands 4.8% in volume for a
temperature increase from 32oF to 180oF, while water increases
3% over the same temperature rise. Allowances must be made
for this expansion in the system design.

4. A 30% mixture of glycol will result in a BTU output loss of 15%
with a 5% increase in head against the system circulator.

5. A 50% mixture of glycol will result in a BTU output loss of 30%
with a 50% increase in head against the system circulator.

It is highly recommended that you carefully follow the glycol
manufacturer’s recommended concentrations, expansion
requirements, and maintenance recommendations (pH
additive breakdown, inhibitor reduction, etc.). Carefully gure
the additional friction loss in the system as well as the reduction
in heat transfer coecients.

Water temperature above 140oF requires the circulator
pump to run continuously and water hardness between 5
and 7 grains. Hardness above 7 grains will damage the heat
exchanger and shorten the service life of the boiler.

LP-428 Rev. 6.6.16

O. Applications

19

Figure 5 - Space Heating - Indirect Priority
FIGURE NOTES:

1. This drawing is meant to demonstrate system piping concept only.

2. A mixing valve is recommended if the DHW temperature is set above the factory setting of 119oF.

3. Install a minimum of 12 diameters of straight pipe upstream of all circulators.

4. Install a minimum of 6 diameters of straight pipe up and downstream of all closely spaced tees.

5. Piping shown is Primary/Secondary.

6. The minimum pipe size for connecting an HTP indirect red water heater is 1”.

7. The minimum pipe size for connecting a Mod Con boiler is 3” for both the 1000 and 1700 models.

8. System ow (Secondary Loop) must be greater than the boiler’s Primary Loop ow.

9. Installations must comply with all local codes.

10. In Massachusetts, a vacuum relief valve must be installed on the cold water line per 248 CMR.

An ASSE 1017 thermostatic mixing valve is recommended on all tanks if the hot water temperature leaving the tank is above
119oF. Failure to do so could result in substantial property damage, serious injury, or death.
The piping will not support the weight of the circulators. Refer to the circulator manufacturer’s instructions to properly support
the circulator. Failure to comply with these instructions could result in property damage, severe personal injury, or death.

LP-428 Rev. 6.6.16

20

Figure 6 - Cascaded Space Heating - Indirect Priority on One

FIGURE NOTES:

1. This drawing is meant to demonstrate system piping concept only.

2. A mixing valve is recommended if the DHW temperature is set above the factory setting of 119

3. Install a minimum of 12 diameters of straight pipe upstream of all circulators.

4. Install a minimum of 6 diameters of straight pipe up and downstream of all closely spaced tees.

5. Piping shown is Primary/Secondary.

6. The minimum pipe size for connecting an HTP indirect red water heater is 1”.

7. The minimum pipe size for connecting a Mod Con boiler is 3” for both the 1000 and 1700 models. See Multiple Boiler Manifold Piping chart,
this manual, when sizing and installing a multiple boiler system.

8. System ow (Secondary Loop) must be greater than the boiler’s Primary Loop ow.

9. Installations must comply with all local codes.

10. In Massachusetts, a vacuum relief valve must be installed on the cold water line per 248 CMR.

11. System sensor must be placed as shown in the drawing.

o

F.

An ASSE 1017 thermostatic mixing valve is recommended on all tanks if the hot water temperature leaving the tank is above
119oF. Failure to do so could result in substantial property damage, serious injury, or death.
The piping will not support the weight of the circulators. Refer to the circulator manufacturer’s instructions to properly support
the circulator. Failure to comply with these instructions could result in property damage, severe personal injury, or death.

LP-428 Rev. 6.6.16

21

Figure 7 - Space Heating

FIGURE NOTES:

1. This drawing is meant to demonstrate system piping concept only.

2. Install a minimum of 12 diameters of straight pipe upstream of all circulators.

3. Install a minimum of 6 diameters of straight pipe up and downstream of all closely spaced tees.

4. Piping shown is Primary/Secondary.

5. The minimum pipe size for connecting a Mod Con boiler is 3” for both the 1000 and 1700 models.

6. System ow (Secondary Loop) must be greater than the boiler’s Primary Loop ow.

7. Installations must comply with all local codes.

The piping will not support the weight of the circulators. Refer to the circulator manufacturer’s instructions to properly support
the circulator. Failure to comply with these instructions could result in property damage, severe personal injury, or death.

LP-428 Rev. 6.6.16

22

Figure 8 - Cascaded Space Heating

FIGURE NOTES:

1. This drawing is meant to demonstrate system piping concept only.

2. Install a minimum of 12 diameters of straight pipe upstream of all circulators.

3. Install a minimum of 6 diameters of straight pipe up and downstream of all closely spaced tees.

4. Piping shown is Primary/Secondary.

5. The minimum pipe size for connecting a Mod Con boiler is 3” for both the 1000 and 1700 models. See Multiple Boiler Manifold Piping chart,
this manual, when sizing and installing a multiple boiler system.

6. System ow (Secondary Loop) must be greater than the boiler’s Primary Loop ow.

7. Installations must comply with all local codes.

8. System sensor must be placed as shown in the drawing.

The piping will not support the weight of the circulators. Refer to the circulator manufacturer’s instructions to properly support
the circulator. Failure to comply with these instructions could result in property damage, severe personal injury, or death.

LP-428 Rev. 6.6.16

Part 5 - Venting and Condensate Removal

The boiler must be vented as detailed in this section.
Ensure exhaust vent and intake piping complies with these
instructions regarding vent system. Inspect nished exhaust
vent and intake piping thoroughly to ensure all joints are
well secured, airtight, and comply with all applicable code
requirements, as well as the instructions provided in this
manual. Failure to properly install the vent system will result
in severe personal injury or death.

A. General

This boiler is certied as a “Category IV” appliance and
requires a special venting system. The vent system will
operate with a positive pressure in the pipe. Exhaust gases
must be piped directly outdoors using the vent materials
and rules outlined in these instructions. Do not connect vent
connectors serving appliances vented by natural draft into
any portion of mechanical draft systems operating under
positive pressure. Follow the venting instructions carefully.
Failure to do so will result in substantial property damage,
severe personal injury, or death.

1. 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.

2. Install the venting system in accordance with these
instructions and with the National Fuel Gas Code, ANSI Z223.1/
NFPA 54, CAN/CGA B149, and / or applicable provisions of
local building codes.

3. This boiler must be vented with materials, components,
and systems listed and approved for Category IV appliances.

Exhaust and intake are to be piped separately. This boiler
cannot share a common exhaust or intake with multiple
appliances. Failure to follow these instructions will result
in substantial property damage, severe personal injury, or
death.

NOTE: To avoid contamination often contained in indoor
air, it is best to pipe all intake combustion air directly to the
outdoors.
NOTE: If exhaust vent pipe system passes through an
unheated space such as an alcove or attic, the space must be
heated.

Improper seating of vent pipe gaskets can cause eventual
gasket failure and exhaust gas leakage. Ensure the exhaust
vent pipe is properly beveled and seated before insertion
into the ue adapter. Failure to do so could result in property
damage, severe personal injury, or death.

23

Due to the extreme ammability of most glues, cements,
solvents, and primers used to join plastic exhaust vent and
intake pipes, explosive solvent vapors must be cleared from
all vent piping before start-up. Avoid using excess cement
or primer, as this may pool in the vent pipes. Vent assemblies
should be allowed to cure for a period of at least 8 hours
before powering a connected appliance. Failure to follow these
instructions will result in substantial property damage, severe
personal injury, or death. It is the installers’ responsibility to
understand the hazards associated with explosive solvents and
take the necessary precautions to avoid these risks.

DO NOT insulate the rst 3 feet of the exhaust vent. CPVC,
Polypropylene, or Stainless Steel pipe material MUST be used
for the rst 3 feet of the vent run if the exhaust vent is insulated
or passes through an enclosed space greater than 6”, such as a
wall. The balance of the vent run can be installed with standard
Schedule 40 PVC pipe. Failure to comply with this warning could
result in property damage, severe personal injury, or death.

Exhaust vent adaptors are not designed as load-bearing
devices, and must not be used to support exhaust vent piping.
All vent pipes must be properly connected, supported, and
the exhaust vent must be pitched a minimum of 1/4” per foot
back to the boiler to allow drainage of condensate. Failure to
properly support vent piping and follow the information in this
statement could result in product damage, severe personal
injury, or death.

LP-428 Rev. 6.6.16

24

B. Approved Materials for Exhaust Vent and Intake Pipe

Item Material

PVC Schedule 40/80 ANSI / ASTM D1785

Exhaust Vent or Intake

Pipe and Fittings

Pipe Cement

Pipe Primer PVC / CPVC ASTM F656

• The exhaust and intake components installed with this boiler must be used for near boiler piping BEFORE transitioning to
the approved materials listed above. DO NOT REMOVE these installed components. Doing so WILL VOID boiler warranty.

• PVC / CPVC pipe and ttings of the same diameter are considered interchangeable.

• DO NOT use Foam Core Pipe in any portion of the exhaust piping from this boiler.

• DO NOT connect PVC / CPVC to PP without an approved vent connector.

• When installing AL29-4C vent piping, install a PVC-to-stainless adapter at the boiler vent connection, and at the

termination when using a PVC termination kit. DO NOT mix AL29-4C piping from dierent manufacturers unless using
adapters specically designed for the purpose by the manufacturer.

• A double wall vent may be used when using stainless steel vent material in a freezing climate.

• *PVC-DWV may be used for air intake applications ONLY.

• Contact the venting material manufacturer if there is any question about the applicability of the proposed venting

material.

Failure to follow these directions will result in substantial property damage, severe personal injury, or death.

Table 7 - Approved Materials for Exhaust Vent and Intake Pipe

PVC-DWV* ANSI / ASTM D2665

CPVC Schedule 40/80 ANSI / ASTM F441

Polypropylene UL-1738 or ULC-S636

Stainless Steel AL29-4C Certied for Category IV and Direct Vent Appliance Venting

PVC ANSI / ASTM D2564

CPVC ANSI / ASTM F493

United States Canada

Standards for Installation In:

PVC, CPVC, and PP Venting Must

be ULC-S636 Certied. IPEX is

an approved manufacturer in

Canada.

IPEX System 636 Cements and

Primers

DO NOT mix components from dierent venting systems
without proper adapters. The vent system could fail, causing
leakage of ue products into the living space. Use only the
approved pipe and tting materials, and primer and cement
specically designed for the material used, as listed in the above
table. Failure to do so could result in property damage, serious
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.

NOTE: The use of double-wall vent or insulated material for the
combustion air intake pipe is recommended in cold climates to
prevent the condensation of airborne moisture in the incoming
combustion air.

C. Additional Requirements for Installation in Canada

1. Installations must be made with a vent pipe system certied
to ULC-S636. IPEX is an approved vent manufacturer in Canada
supplying vent material listed to ULC-S636. Additionally,
you may use AL29-4C stainless steel venting to comply with
Canadian requirements.

2. The rst three (3) feet of vent pipe from the boiler ue
outlet must be readily accessible for visual inspection. 3.
The components of the certied vent system must not be
interchanged with other vent systems or unlisted pipe /
ttings.
Cellular foam core piping may be used on air inlet piping only.

You must not use “B” vent in an exhaust application. “B” vent
is for intake applications ONLY. Using “B” vent in an exhaust
application will result in serious injury or death.

LP-428 Rev. 6.6.16

D. Exhaust Vent and Intake Pipe Location

E I

Area Where Terminal Is Not Permitted

Intake Pipe Terminal

Exhaust Vent Terminal

Figure 9 - Exit Terminals for Direct Vent Systems - ANSI Z223.1 / NFPA 54 for US and CAN/CSA B149.1 for Canada

DETERMINE EXHAUST VENT AND INTAKE PIPE LOCATION –
NOTES:
INSTALLATIONS IN THE UNITED STATES
A. Provide a minimum of 1 foot clearance from the bottom of the

exhaust vent and intake pipe above the expected snow accumulation
level. Snow removal may be necessary to maintain clearance.
B. Provide a minimum of 1 foot distance from exhaust vent
termination to any door, operable window, or gravity intake into any
building.
C. Provide a minimum of 1 foot distance from exhaust vent
termination to any permanently closed door or window.
D. Provide a minimum of 4 feet vertical clearance from the exhaust
vent to all roof overhangs.
E. Locating exhaust vent termination near roof overhangs will result
in the formation of icicles in freezing weather, and could result
in blockage of the exhaust vent. To prevent icicles from forming,
maintain 4 feet vertical clearance from the exhaust vent to all roof
overhangs.
F. Provide 4 feet clearance from the outside corner of vertical
walls, chimneys, etc., as well as horizontal corners created by roof
overhangs.
G. Provide 6 feet clearance from the inside corner of vertical
walls, chimneys, etc., as well as horizontal corners created by roof
overhangs.
H. Provide 4 feet clearance from center line within a height of 15 feet
above electrical meters, gas meters, gas regulators, relief equipment,
exhaust fans and inlets.
I. Provide 4 feet horizontal clearance from electrical meters, gas
meters, gas regulators, relief equipment, exhaust fans and inlets. In
no case shall the exit terminal be above or below the aforementioned
equipment unless the 4 foot horizontal distance is maintained.
J. This boiler vent system shall terminate at least 3 feet (0.9 m) above
any forced air intake located within 10 ft (3 m).
NOTE: This does not apply to the combustion air intake of a direct­vent appliance.
K. When venting with a two pipe system, maximum distance
between exhaust vent and intake pipe is 6 feet (1.8 m). Minimum
distance between exhaust vent and intake pipe on single direct
vented appliance is 10” (0.255 m) center-to-center. Minimum
distance between exhaust vents and intake pipes on multiple boilers
is 10” (0.255 m) center-to-center.
L. When adjacent to a public walkway, locate exit terminal at least 7
feet above grade.

In addition:

• Total length of vent piping shall not exceed the limits specied
in this manual.

• The vent piping for this direct vented appliance is approved for
zero clearance to combustible construction.

• The ue products coming from the exhaust vent will create a
large plume when the boiler is in operation. Avoid venting in
areas that will aect neighboring buildings or be considered
objectionable.

• DO NOT locate exhaust vent or intake pipe in a parking area
where machinery may damage the pipe.

• DO NOT locate the exhaust vent or intake pipe terminals under
a porch, balcony, or veranda.

• Avoid terminating exhaust vents near shrubs, air conditioners,
or other objects that will obstruct the exhaust stream.

• DO NOT vent over a public walkway. Condensate could drip or
freeze and create a nuisance or hazard.

• NOTE: Due to potential moisture build-up, sidewall venting
may not be the preferred venting option. Carefully consider

venting installation and location to save time and cost.

INSTALLATIONS IN CANADA
NOTE: Canadian installation must comply with the CAN/CSA B149.1

code and applicable local codes and supersede the restrictions for the
United States outlined in this section.

It is required to insert exhaust and intake screens into the vent
terminations to prevent blockage caused by debris or birds.
Failure to keep terminations clear could result in property
damage, severe personal injury, or death.
The building owner is responsible for keeping the exhaust
and intake terminations free of snow, ice, or other potential
blockages, as well as scheduling routing maintenance. Failure to
keep the vent piping terminations clear and properly maintain
the boiler could result in property damage, severe personal
injury, or death.
For each oor containing bedroom(s), a carbon monoxide
detector and alarm shall be placed in the living area outside
the bedrooms, as well as in the room that houses the boiler.
Detectors and alarms shall comply with NFPA 720 (latest
edition). Failure to comply with these requirements could result
in product damage, severe personal injury, or death.

25

LP-428 Rev. 6.6.16

26

E. Exhaust Vent and Intake Pipe Sizing

Intake Pipe Exhaust Vent Max. Total Equivalent

Model

MODCON1000 6”

MODCON1700 8” 8”

Table 8 - Exhaust Vent and Intake Pipe Sizing

1. The maximum total equivalent length of exhaust vent and
intake pipe should not exceed the lengths in Table 8.

a. The equivalent length of elbows, tees, and other ttings
are listed in the Friction Loss Table.

Friction Loss Equivalent in Piping and Fittings

Fittings or Piping

90 Degree Elbow* 3’ 3’

45 Degree Elbow 1’ 1’

Air Inlet Tee 0’ 0’

Straight Pipe 1’ 1’

V Series Vent Kit 1’ 1’

AL20 4c Vent Terminal 1’ 1’

Table 9 - *Friction loss for long radius elbow is 1 foot less. NOTE:
Consult Polypropylene venting instructions for friction loss and
pressure drop equivalents.

b. For example: If the exhaust vent has two short 90o elbows
and 10 feet of PVC pipe we will calculate:
Exhaust Vent Equivalent Length = (2x3) + 10 = 16 feet.
Further, if the intake pipe has two 90o elbows, one 45o
elbow, and 10 feet of PVC pipe, the following calculation
applies:
Intake Pipe Equivalent Length = (2x3) + 1 + 10 = 17 feet.
The total equivalent length is 43 feet, well below the
maximum of 200 feet.
c. Eort should be made to keep a minimum dierence in
equivalent length between the exhaust vent and intake
pipe.

2. The minimum total equivalent length is 16 feet.

Do not exceed the maximum lengths for vent pipes. Excessive
length could result in boiler shutdown and property damage.

Failure to provide a minimum total vent length of 16 equivalent
feet could result in property damage and improper product
operation.

Figure 10 - Transitioning to Larger Diameter Pipe

LP-428 Rev. 6.6.16

Intake Diameter Intake Min. Length Vent Diameter Vent Min. Length

16’

Equivalent Feet

6” 8”

Coupling 0’ 0’

6”

Vent Length (Intake

and Exhaust)

16’ 150’ 2%

Input De-Rate
Per 25’ of Vent

F. Exhaust Vent and Intake Pipe Installation

All joints of positive pressure vent systems must be sealed
completely to prevent leakage of ue products into the living
space. Failure to do so could result in property damage,
serious injury, or death.

1. Use only solid PVC, CPVC, or stainless steel pipe or a
Polypropylene vent system approved for use with Category IV
appliances.
FOAM CORE PIPING IS NOT APPROVED FOR EXHAUST
VENT APPLICATIONS. Foam core piping may be used on air
inlet piping only.

2. Remove all burrs and debris from joints and ttings.

3. When using PVC or CPVC pipe, all joints must be properly
cleaned, primed, and cemented. Use only cement and primer
approved for use with the pipe material. Cement must
conform to ASTM D2564 for PVC and ASTM F493 for CPVC
pipe. NOTE: DO NOT CEMENT POLYPROPYLENE PIPE.

4. Ensure the vent is located where it will not be exposed to
prevailing winds.

5. In all roof venting applications, exhaust discharge must
point away from the pitch of the roof.

6. If the exhaust vent is to be terminated in a walled o area
(such as a roof with a parapet wall), ensure the exhaust vent
terminates a minimum of 10’ from nearest wall and extends
level with or above the top of the wall. This will ensure ue gas
does does not get trapped and possibly recirculated into the
intake air pipe, which could contaminate the combustion air.

7. To prevent water leakage, install adequate roof ashing
where the pipe enters the roof.

8. Do not locate vent over public walkways, driveways, or
parking lots. Condensate could drip and freeze, resulting in a
slip hazard or damage to vehicles and machinery.

9. Due to potential moisture build-up, sidewall venting may
not be the preferred venting option. To save time and cost,
carefully consider venting installation and location.

10. Horizontal lengths of exhaust vent must slope back towards
the boiler not less than ¼” per foot to allow condensate to
drain from the vent pipe.

11. The exhaust vent must terminate where vapors cannot
make accidental contact with people or pets, or damage
shrubs or plants.

12. In vacant chimney applications, install and seal a rain cap
over existing chimney openings.

13. All piping must be fully supported. Use pipe hangers at a
minimum of 4 foot intervals to prevent sagging of the pipe
where condensate may form.

14. Do not use the boiler to support any piping.

15. Ensure the outdoor exhaust vent termination is screened
to prevent blockage caused by debris or birds.

16. Ensure the outdoor intake pipe termination is screened to
prevent blockage caused by debris or birds.

27

G. Applications

1. Direct Vent Installation of Exhaust and Intake

If installing a direct vent option, combustion air must be drawn from the outdoors directly into the boiler intake, and exhaust
must terminate outside. There are three basic direct vent options detailed in this manual: 1. Side Wall Venting, 2. Roof Venting,
and 3. Unbalanced Venting.
Be sure to locate the boiler such that the exhaust vent and intake pipe can be routed through the building and properly
terminated. Dierent vent terminals can be used to simplify and eliminate multiple penetrations in the building structure (see
Optional Equipment in Venting Section). The exhaust vent and intake pipe lengths, routing and termination methods must all
comply with the methods and limits given in the Venting section of this manual.
When installing a combustion air intake from outdoors, care must be taken to utilize uncontaminated combustion air. NOTE: To
prevent combustion air contamination, see Table 1.

Figure 11 - Stainless Steel Two Pipe Roof and Sidewall Venting

NOTE: These drawings are meant to demonstrate system venting only. The installer is responsible for all equipment and detailing

required by local codes.

All vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of ¼” per foot back to the boiler
to allow drainage of condensate. Exhaust connection insertion depth should be a minimum of 2 ½” for 1000 models and 3” for
1700 models. When placing support brackets on vent piping, the rst bracket must be within 1’ of the appliance and the balance
at 4’ intervals on the vent pipe. Boiler venting must be readily accessible for visual inspection for the rst three feet from the
boiler.

Take extra precaution to adequately support the weight of vent pipes terminating through the roof. Failure to properly support
roof terminated piping could result in property damage, serious injury, or death.

LP-428 Rev. 6.6.16

28

Figure 12 - Venting with Optional Kits (NOT INCLUDED WITH THE
BOILER)

NOTE: These drawings are meant to demonstrate system

venting only. The installer is responsible for all equipment and
detailing required by local codes.

All vent pipes must be glued, properly supported, and the
exhaust must be pitched a minimum of ¼” per foot back to the
boiler to allow drainage of condensate. Exhaust connection
insertion depth should be a minimum of 2 ½” for 1000 models
and 3” for 1700 models. When placing support brackets on vent
piping, the rst bracket must be within 1’ of the appliance and
the balance at 4’ intervals on the vent pipe. Boiler venting must
be readily accessible for visual inspection for the rst three feet
from the boiler.

Take extra precaution to adequately support the weight of vent
pipes terminating through the roof. Failure to properly support
roof terminated vent piping could result in property damage,
serious personal injury, or death due to ue gas leakage.

Figure 13 - Unbalanced Venting - Roof Exhaust and Sidewall
Intake

NOTE: These drawings are meant to demonstrate system

venting only. The installer is responsible for all equipment and
detailing required by local codes.

An unbalanced vent system can be installed ONLY when the
exhaust is in the vertical position. Failure to do so could result
in serious personal injury or death.

LP-428 Rev. 6.6.16

29

2. Room and Indoor Combustion Ventilation Requirements

When using an indoor combustion air installation, the
mechanical room MUST be provided with properly sized
openings, and/or be of sucient volume to assure adequate
combustion air and proper ventilation for all gas red appliances
in the mechanical room to assure adequate combustion air and
proper ventilation. The requirements shown here are for the
boiler only. Additional gas red appliances in the mechanical
room will require an increase in the net free area and/or
volume to supply adequate combustion air for all appliances.
This must be done in accordance with the National Fuel Gas
Code, NFPA 54 / ANSI Z223.1.
This boiler can be vented using mechanical room air only for
combustion. No combustion air openings are needed when
the boiler is installed in a space with a volume NO LESS than 50
cubic feet per 1,000 BTU/hr of all installed gas red appliances
and the building MUST NOT BE of “Tight Construction”.
TIGHT CONSTRUCTION: A building with less than .4 ACH
(air changes per hour). For buildings of “Tight Construction”,
provide air openings into the building from the outside.
Indoor and outdoor combustion air may be combined by
applying a ratio of available volume to required volume times
the required outdoor air opening(s) size(s). This must be done
in accordance with the National Fuel Gas Code, NFPA 54 /
ANSI Z223.1.

1. If air is taken directly from outside the building with no duct,
provide two permanent openings to the mechanical room
each with a net free area of one square inch per 4000 BTU/hr
input. See Figure 14.

2. If combustion and ventilation air is taken from the outdoors
using a duct to deliver the air to the mechanical room, each of
the two openings should be sized based on a minimum free
area of one square inch per 2000 BTU/hr input. See Figure 15.

3. If air is taken from another interior space combined with the
mechanical room:

a. Two spaces on same story: Each of the two openings
specied should have a net free area of one square inch for
each 1000 BTU/hr input, but not less than 100 square inches.
b. Two spaces on dierent stories: One or more openings
should have a net free area of two square inches per 1000
BTU/hr.

See Figure 16 for reference.

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. This opening must be located within 12”
of the top of the enclosure. See Figure 17.
Combustion air requirements are based on the latest edition
of the National Fuel Gas Code, NFPA 54 / ANSI Z223.1, CGA
Standard CAN/CSA B149.1 in Canada. Check all local code
requirements for combustion air.
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.
Where two openings are provided, one must be within 12”
of the ceiling, and one must be within 12”of the oor of the
mechanical room. Each opening must have a net free area as
specied in Table 10. Single openings shall commence within
12” of the ceiling. The minimum dimension of air openings

should not be less than 3”.

Figure 14 - Combustion Air from Outdoors

Figure 15 - Combustion Air through Ductwork

Figure 16 - Combustion Air from Indoors

Figure 17 - Combustion Air from Outdoors - Single Opening

LP-428 Rev. 6.6.16

30

Under no circumstances should the mechanical 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. Failure
to follow these instructions could result in property damage or
personal injury.

Combustion air supply must be completely free of any
ammable vapors that may ignite, or chemical fumes which may
be corrosive to the boiler. See Table 1 for a list of combustion
air contaminants. These chemicals, when burned, form acids
which quickly attack the stainless steel heat exchanger, headers,
ue connectors, and the vent system. The result is improper
combustion and premature boiler failure. Such failure IS NOT
covered under warranty.
EXHAUST FANS: Any fan or appliance which exhausts air from
the mechanical room may deplete the combustion air supply
and/or cause a downdraft in the venting system. Spillage of ue
products from the venting system into an occupied living space
can cause a very hazardous condition that must be corrected
immediately.

Minimum Recommended Combustion Air Supply to

Mechanical Room

Figure 14 Figure 15

*Outside Air from 2

Openings Directly

Model

MODCON1000

MODCON1700

Model

MODCON1000

MODCON1700

Table 10 - Indoor Combustion Air Sizing

The above requirements are for the boiler only; additional gas red
appliances in the mechanical room will require an increase in the net
free area and/or volume to supply adequate combustion air for all
appliances.
No combustion air openings are needed when the boiler is installed in
a space with a volume NO LESS than 50 cubic feet per 1,000 BTU/hr
of all installed gas red appliances. Buildings MUST NOT be of *”Tight
Construction”.

1

Outside air openings shall communicate with the outdoors.

2

Combined interior space must be 50 cubic feet per 1,000 BTU/hr input.

Buildings MUST NOT be of *”Tight Construction”.

from Outdoors

Top

Opening,

2

in

250 250 500 500

425 425 850 850

Inside Air from 2 Ducts Delivered

from Interior Space

Same Story

Top

Opening,

2

in

1000 1000 2000 335

1700 1700 3400 570

1

Bottom

Opening,

2

in

Figure 16 Figure 17

Bottom

Opening,

2

in

*Outside Air from 2

Ducts Delivered from

Outdoors

Top

Opening,

2

in

2

Dierent

Stories

Top

Opening,

2

in

1

Bottom

Opening, in

*Outside

Air from 1

Opening Di-

rectly from

Outdoors,

2 1

in

2

H. Condensate Removal System

NOTE: Check with your local gas company to determine if
combustion condensate disposal is permitted in your area. In
the state of Massachusetts, condensate must be neutralized
before entering a drain.
This boiler is a high eciency appliance, and therefore
produces condensate: a by-product of the combustion
process. A condensate collection system with an internal
oat switch monitors condensate level to prevent it from
backing up into the combustion system. There is a ¾” socket
connection provided to connect the outlet of the collection
system to a drain or condensate pump.
Condensate from the boiler is slightly acidic with a pH of 3.2 -

4.5. To avoid long term damage to the drainage system and to
meet local code requirements, HTP recommends neutralizing
condensate with a Condensate Neutralizer Kit (Part # 7350P-

611). The neutralizer kit connects to the drain system and
contains limestone chips that neutralize the pH level of the
condensate. The neutralizer kit should be checked annually
and the limestone chips replenished if necessary. When
replacing the limestone chips, take care to ensure chips are
no smaller than 1/2” to avoid blockage in condensate piping
(refer to gure below for piping of the condensate neutralizer.)

Figure 18 - Condensate Piping
NOTES:

1. Condensate line must be pitched at least ¼” per foot to
properly drain. If this cannot be done, or a very long length
of condensate hose is used, increase the condensate line
to a minimum of 1” ID and place a tee in the line after the
condensate neutralizer to properly reduce vacuum lock in the
drain line.

LP-428 Rev. 6.6.16

2. PVC or CPVC pipe should be the only material used for
condensate line. Steel, brass, copper, and other metals will be
subject to corrosion or deterioration.

3. A frozen condensate line could result in a blocked vent
condition. It is very important to protect the condensate
line from freezing temperatures or any type of blockage.
In installations that may encounter sustained freezing
conditions, the use of heat tape is recommended to avoid
freezing of the condensate line. It is also recommended to bush
up the condensate line size to 1” and terminate condensate
discharge as close to the unit as possible. Longer condensate
runs are more prone to freezing. Damages due to frozen or
blocked condensate lines ARE NOT covered by warranty.

4. Support of the condensate line may be necessary to avoid
blockage of the condensate ow.

5. To allow proper drainage on longer horizontal condensate
runs, tubing size may need to increase to 1” and a second line
vent may be required.
NOTE: To clean out condensate trap, see Maintenance
section.

The condensate line must remain unobstructed. If allowed
to freeze in the line or obstructed in any other manner,
condensate can exit from the boiler tee, resulting in potential
water damage to property. When installing a condensate
pump, select one approved for use with condensing boilers
and furnaces. The condensate pump should have an overow
switch to prevent property damage from spillage. Condensate
from the boiler will be slightly acidic (pH from 3.2 to 4.5).
Install a neutralizing lter if required by local codes.
Is is very important that condensate piping be no smaller
than 3/4”. Use a tee at the condensate connection with a
branch vertically up and open to the atmosphere to prevent a
vacuum that could obstruct the ow of condensate from the
boiler. To prevent sagging and maintain pitch, condensate
piping should be supported with pipe supports.

When installing a condensate pump, select one approved for
use with condensing boilers and furnaces. The pump should
have an overow switch to prevent property damage from
condensate spillage.

Power to the optional condensate pump is continuous. When
the boiler is powered o the condensate pump will remain on.
It is important to remember to turn o the condensate pump
when powering down the boiler. Failure to do so could result
in property damage, severe personal injury, or death.

Part 6 - Wiring

To avoid electrical shock, turn o all power to the boiler prior
to opening an electrical box within the unit. Ensure the power
remains o while any wiring connections are being made.
Failure to follow these instructions could result in component
or product failure, serious injury, or death. Such product
failure IS NOT covered by warranty.
Jumping out control circuits or components WILL VOID
product warranty and can result in property damage, personal
injury, or death.

31

It is of extreme importance that this unit be properly grounded. It
is very important that the building system ground is inspected by
a qualied electrician prior to making this connection. Electrical
power must only be turned on when the boiler is completely
lled with cold water. Failure to follow these instructions could
result in component or product failure, serious injury, or death.
Electrical Shock Hazard - Turn o electrical power supply at
service entrance panel before making any electrical connections.
Failure to follow do do so could result in serious injury, or death.

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

Wiring must be NEC Class 1. If original wiring supplied with the
boiler must be replaced, use only TEW 105 oC wire or equivalent.
Boiler must be electrically grounded as required by the National
Electrical Code, ANSI/NFPA 70 - Latest Edition.

A. Installation Must Comply With

1. National Electrical Code and any other national, state,
provincial, or local codes or regulations.

2. In Canada, CSA C22.1, Canadian Electrical Code Part 1, and
any local codes.

B. Field Wiring
Terminations

All connections made
to the boiler in the
eld are done inside
the electrical junction
box located on the
left side of the unit.
Multiple knockout
locations are available
to route eld wires
into and out of the
electrical junction
box.

Figure 19 - Knockout Locations

C. Field Wiring

Check water chemistry section for acceptable levels. If water
chemistry is acceptable, pumps may be wired directly to pump
terminals. If water chemistry levels are too high, you must
wire pumps to line voltage to run continuously to prevent lime
buildup.

The control used in these boilers is capable of directly controlling
3 pumps as congured. Each pump output can provide a
maximum of 3 amps at 120 volts. This output is sucient to
operate the coil of a motor starter correctly sized for the pump
or pumps used in this system design.
The electrical junction box has separate, clearly marked terminal
strips for line voltage and low voltage wiring. Special jacks are
provided for trouble-free cascade system wiring using standard
CAT3 or CAT5 patch cables.

LP-428 Rev. 6.6.16

32

D. Line Voltage Wiring

1. Connect the incoming power wiring to the line voltage
terminal strip in the electrical junction box at terminals 120V,
Neutral, Ground of the bottom boiler (shown in Figure 20).

2. A line voltage fused disconnect switch may be required,
externally mounted and connected according to local codes that
may apply.

3. Connect the central heating pump motor starter coil to the
terminals marked BOILER HOT, BOILER NEUT, and BOILER
GRD in the bottom boiler.

4. If using DHW, connect the domestic hot water pump to
the terminals marked DHW HOT, DHW NEUT, DHW GND on
the bottom boiler. The connections shown are suitable for
a maximum continuous pump draw of 3 amps at 120 volts.
If a pump requires more current or voltage than the 120 volts
supplied, an external motor starter or contactor will be required.

E. Alarm Connections (Top Boiler Connection)

The control includes a dry contact alarm output. This is an SPDT
circuit, rated at 5 amps at 120 volts. This contact can be used to
activate an alarm light or bell or notify a building management
system if the boiler goes into a lockout condition. The circuit
between the ALARM COM and NC terminals is closed during
normal operation and the circuit between ALARM COM and
NO is open during normal operation. The connections depicted
in Figure 20 show two 120 volt lights connected to the alarm
terminals. One light will be on when the boiler is in normal mode
and the other light will be on when the boiler is in lockout mode.

F. Low Voltage Connections for Standard Boiler

1. All low voltage cables should enter the electrical junction box
through the provided knock out holes as shown in Figure 19.

2. Connect all low voltage eld devices to the low voltage
terminal strip located in the electrical junction box.

4. Mount the outdoor sensor on an exterior surface of the
building, preferably on the north side in an area that will not
be aected by direct sunlight and will be exposed to varying
weather conditions.

I. Indirect Sensor (Top Boiler Connection)

1. There is no connection required if an indirect water heater is
not used in this installation.

2. The boiler will operate an indirect red water heater with
either a thermostat type aquastat installed in the indirect
tank, or an HTP 7250P-325 tank sensor. When a tank sensor
is used, the control will
automatically detect its
presence and a demand
for heat from the
indirect water heater
will be generated when
the tank temperature
falls below the user
selected set point by
more than the user
selected oset. The
demand will continue
until the sensor
measures that the
indirect water heater
temperature is above
the set point.

3. Connect the indirect
tank sensor (7250P-325)
to the terminals marked
DHW SENSOR (shown in Figure 20) in the electrical junction
box of the top boiler.

G. Thermostat

1. Connect the room thermostat to the terminals marked
THERMOSTAT in the electrical junction box (shown in Figure

20). Alternately, any dry contact closure across these terminals
will cause the boiler to run. Caution should be taken to ensure
neither of the terminals becomes connected to ground.

2. Mount the thermostat on an inside wall as centrally as possible
to the area being heated, but away from drafts or heat producing
devices such as television sets that could inuence the ability of
the thermostat to measure room temperature.

3. If the thermostat is equipped with an anticipator and it is
connected directly to the Mod Con boiler, the anticipator should
be set at .1 amps. If the thermostat is connected to other devices,
the anticipator should be set to match the power requirements
of the device it is connected to. See the instruction manual of
the connected devices for further information.

H. Outdoor Sensor

1. There is no connection required if an outdoor sensor is not
used in this installation.

2. If using an outdoor sensor, connect wires for sensor to the
terminals marked OUTDOOR SEN (shown in Figure 20) in the
electrical junction box of the bottom boiler. Caution should be
used to ensure neither of these terminals becomes connected
to ground.

3. Use a minimum 22 AWG wire for runs of 100 feet or less and
minimum 18 AWG wire for runs of up to 150 feet.

Failure to use the correct sensor may result in tank
temperature being either above or below set point, and
could result in decreased performance, substantial property
damage, or heightened risk of injury or death due to scalds.
Caution should be used to ensure neither of these terminals
becomes connected to ground.

NOTE: If sensor wires are located in an area with sources of
potential electromagnetic interference (EMI), the sensor
wires should be shielded, or the wires routed in a grounded
metal conduit. If using shielded cable, the shielding should be
connected to the common ground of the boiler.

J. Optional 0-10 Volt Building Control Signal

1. A signal from a building management system may be
connected to the boiler to enable remote control. This signal
should be a 0-10 volt positive-going DC signal. When this input
is enabled using the installer menu, a building control system
can be used to control the set point temperature of the
boiler. The control interprets the 0-10 volt signal as follows;
when the signal is between 0 and 1.5 volts, the boiler will be
in standby mode, not ring. When the signal rises above 1.5
volts, the boiler will ignite. As the signal continues to rise
towards its maximum of 10 volts, the boiler will increase in
set point temperature. See Part 10 for details on the setting of
parameters 16 and 17.

2. Connect a building management system or other auxiliary

LP-428 Rev. 6.6.16

33

Figure 20 - Cascade Master and Follower Wiring

control signal to the terminals marked 16, 0-10 VOLT + and
17, 0-10 VOLT – in the electrical junction box (shown in Figure

20). Caution should be used to ensure that the 0-10 VOLT +
connection does not become connected to ground.

K. Optional High Gas Pressure Switch

1. If an optional high gas pressure switch is used, it should be
installed on the outlet side of the gas valve of both boilers.
This is normally closed and will open if the pressure goes
above 1.5” w.c. on the outlet side.

2. Locate the two pigtails hanging from the electrical box inside
of the boiler cabinet. Remove and discard the jumper plug from
one of the unused pigtails.

3. Connect the high gas pressure switch to the pigtail that you
removed the jumper plug from.

L. Optional Low Gas Pressure Switch

1. If an optional low gas pressure switch is used, it should be
installed on the inlet side of the gas valve of both boilers. This is
normally closed and will open if the pressure goes below 1” w.c.

LP-428 Rev. 6.6.16

34

Figure 21 - MODCON Internal Connection Diagram

on the inlet side.

2. Locate the two pigtails hanging from the electrical box inside
of the boiler cabinet. Remove and discard the jumper plug from
one of the unused pigtails.

3. Connect the low gas pressure switch to the pigtail that you
removed the jumper plug from.

M. Optional Flow Switch

NOTE: Follow the more detailed instructions included with the
ow switch kit for proper installation steps.
NOTE: The boiler requires two (2) ow switches to ensure
there is enough ow through each heat exchanger of the boiler
assembly.

1. Attach the correct ow paddle to the ow switch.

2. Thread brass tee onto outlet nipple using pipe dope. Make

LP-428 Rev. 6.6.16

certain the branch points up on horizontal runs.

3. Thread ow switch into tee using pipe dope. Make certain
the FLOW arrow points in the correct direction.

4. Disconnect red wire on the low water cut o probe and
connect it to the red wire from the wire harness (included in
kit).

5. Feed green ground wire into boiler through the wire access.

6. From the front of the boiler, feed the ground wire up into
the control box.

7. Once into the control box, attach the green ground to the
ground bus connection.

8. Connect red wire from ow switch to boiler wire harness.

9. When installation is complete, power up the boiler and use
the control to access installer parameter #20 and change the
default value to 2 (see Part 10 in this manual). When done,

35

create a demand and observe boiler function to verify the
installation is working properly.
NOTE: Installing the optional ow switch will disable the
built-in low water cuto. If a ow switch and a low water
cuto are necessary for the installation, purchase and install
the optional UL353 LWCO (available from HTP, Part # 7350P-

601). In this installation, it is recommended to install the ow
switch kit rst.

N. Optional UL353 Low Water Cut-O Interface Kit

NOTE: This boiler will require 2 interface kits to ensure both
heat exchangers are full of water.

1. If an optional UL353 low water
cut-o (LWCO) interface kit is used,
the control box of the kit should be
mounted to the left side of the boiler
cabinet near the low water cut-o
probe, which is located on the outlet
nipple of the boiler.

2. If the optional ow switch is
present on the boiler, then the orange
wire from the LWCO control box
is left unconnected. If the optional
ow switch is not installed on or
connected to the boiler, remove the
wire connected to the low water cut­o probe on the boiler and connect
it to the orange wire from the newly
mounted LWCO control box.

3. Connect the single red wire from the
control box to the low water cut-o
probe on the boiler.

4. Route the rest of the wires through the hole
provided in the cabinet and down by the main
electrical enclosure.

5. Locate the two pigtails hanging from the main
electrical enclosure. Select the pigtail which has
a white, red, and brown wire in it. If the pigtail is
connected to a gas pressure switch, skip to step 7. If
this pigtail is not connected to a gas pressure switch,
remove the jumper plug from the end of the pigtail
and place the jumper plug into the mating connector
coming from the LWCO control box.

6. Connect the pigtail to the remaining plug coming
from the LWCO control box. Installation is complete.

7. If the pigtail located in step 5 is connected to a gas
pressure switch, disconnect it from the gas pressure
switch and connect the pigtail to the mating connector coming
from the LWCO control box. Connect the gas pressure switch
to the remaining connector from the LWCO control box.

Figure 22 - Wiring Cascade System

O. Wiring of Cascade System Communication Bus

NOTE: A termination plug is included in the CAT 3 / CAT 5 Bus
Connection Point labeled J3 in Figure 20. DO NOT REMOVE
THIS PLUG UNLESS INSTRUCTED TO DO SO. Doing so will
aect boiler operation and void warranty.

1. A Cascade Bus Termination Plug has been installed on the
customer connection board of this boiler. The purpose of this
plug is to stabilize communication between multiple boilers
and reduce electrical “noise”. See Figure 23 for Cascade Bus
Termination Plug installation detail.

2. Use standard CAT3 or CAT5 computer network patch cables
to connect the communication bus between each of the boilers.
The cable must be of the “straight through” design. These cables
are readily available at any oce supply, computer, electronic,
department or discount home supply store in varying lengths.
If you possess the skills you can also construct custom length
cables.

3. It is recommended to use the shortest length cable that will
reach between the boilers and create a neat installation. Do not
run unprotected cables across the oor where they may become
wet or damaged. Avoid running communication cables parallel

Figure 23 - Cascade Termination Plug Detail

and close to or against high voltage (120 volt or greater) wiring.
HTP recommends that the maximum length of communication
bus cables not exceed 200 feet.

4. Route the communication cables through one of the
knockouts in the cabinet.

5. Connect the boilers in a daisy chain conguration as shown
below. It is best to wire the boilers using the shortest wire
runs rather than trying to wire them in the order that they are
addressed. The communication bus jacks on the customer
connection panel are interchangeable so you can use either one
or both in any order to connect the cable.
If you have connected the boilers to each other properly, there
will be no open communication connection ports.

LP-428 Rev. 6.6.16

36

Part 7 - Gas Connections

Failure to follow all precautions could result in re, explosion,
severe injury, or death.

It is very important that you are connected to the type of gas
noted on the rating plate. “LP” for liqueed petroleum, propane
gas, or “NG” for natural or city gas. Do not do a gas conversion
without an approved gas conversion kit. Prior to turning the
gas on, all gas connections must be approved by the local gas
supplier or utility, in addition to the governing authority.
A gas conversion kit comes with MODCON1000 boilers ONLY.
Field conversions ARE NOT ALLOWED on the MODCON1700. A
properly calibrated combustion analyzer must be used to verify
proper combustion. Failure to follow the above instructions
could result in property damage, serious injury, or death.

The gas supply shall have a maximum inlet pressure of less than
14” w.c. (3.5 kPa), and a minimum of 3.5” w.c. (.87 kPa). The
entire piping system, gas meter and regulator must be sized
properly to prevent pressure drop greater than 0.5” (.12 kPa) as
stated in the National Fuel Gas Code. This information is listed
on the rating label.

Care must be taken when applying compound to prevent
blockage or obstruction of gas ow which may aect the
operation of the unit.

UL recognized fuel gas detectors are recommended in all
enclosed propane and natural gas applications where there is a
potential for an explosive mixture of fuel gas to accumulate. The
installation of these detectors should be made in accordance
with the detector manufacturer’s recommendations, and/
or local laws. Failure to install fuel gas detectors in these
applications could result in re, explosion, property damage,
severe personal injury, or death.

The gas connection on the boiler is 2” for the MODCON1000
and 2 1/2” for the MODCON1700. It is mandatory that this tting
is used for connection to a eld fabricated drip leg as shown in
the illustration per the National Fuel Gas Code. You must ensure
the entire gas line to the connection at the boiler is no smaller
than the unit supplied connection.
Once all inspections have been performed, the piping must be
leak tested. If the leak test requirement is a higher test pressure
than the maximum inlet pressure, you must isolate the boiler
from the gas line. In order to do this, shut the gas o using factory
and eld-installed gas cocks. This will prevent high pressure.
Failure to do so may damage the gas valve. In the event the gas
valve is exposed to a pressure greater than ½ PSI, 14” w.c. (3.5
kPa), the gas valve must be replaced. Never use an open ame
(match, lighter, etc.) to check gas connections.

A. Gas Piping

1. Run the gas supply line in accordance with all applicable codes.

2. Locate and install manual shuto valves in accordance with
state and local requirements.

3. In Canada, the Manual Shuto must be identied by the
installing contractor.

4. It is important to support gas piping as the unit is not designed
to structurally support a large amount of weight.

5. Purge all gas lines thoroughly to avoid start up issues with air
in the lines.

6. Sealing compound must be approved for gas connections.

Figure 24 - Gas Connection

LP-428 Rev. 6.6.16

Support gas supply piping with hangers, not by the boiler
or its accessories. The boiler gas valve and blower will not
support the weight of the piping. Make sure the gas piping
is protected from physical damage and freezing, where
required. Failure to follow these instructions could result in
gas leakage, and result in re, explosion, property damage,
severe personal injury, or death.
Do not use Teon tape on gas line pipe thread. Use a pipe
compound rated for use with natural and propane gases.
Apply sparingly on male pipe ends, leaving the two end
threads bare and ow unobstructed. Failure to follow these
instructions could result in gas leakage or blockage, and
result in re, explosion, property damage, severe personal
injury, or death.

Never use an open ame (match or lighter) to check for gas
leaks. Use a soapy solution to test connection. Failure to use
a soapy solution test or check gas connection for leaks can
result in substantial property damage, severe personal injury,
or death.

37

shut o the gas and electrical power to unit.

2. Loosen the pressure tap with a small screwdriver. Refer to
Figures 25 and 26 for location.

3. Each unit is equipped with a needle valve that will accept a
5/16 ID hose to connect to a digital manometer or liquid gauge
to measure incoming pressure from 0-35” w.c.

4. Turn on the gas and power up the unit.

5. Put the unit into manual test mode (details on test mode in
Part 10). In test mode, monitor pressure to assure it does not
drop below 1 inch from its idle reading. If gas pressure is out
of range or pressure drop is excessive, contact the gas utility,
gas supplier, qualied installer, or service agency to determine
correct action that is needed to provide proper gas pressure to
the unit. If Gas Pressure is within normal range proceed to Step

6.

6. Exit test mode, then turn power o and shut o gas supply at
the manual gas valve before disconnecting the hose from the
gas monitoring device. Tighten screw on the pressure tap and
turn gas on. Check for leaks with soapy solution. Bubbles will
appear on the pipe to indicate a leak is present.

Use two wrenches when tightening gas piping at the boiler:
One to prevent the boiler gas line from turning. Failure to
prevent the boiler gas connection from turning could result
in damage to the gas line components, substantial property
damage, severe personal injury, or death.

CSA or UL listed exible gas connections can be used when
installing the boiler. Flexible gas connections have dierent
capacities and must be sized correctly for the connected
boiler ring rates. Consult with the ex line supplier to assure
the line size is adequate for the job. Follow local codes for
proper installation and service requirements.

B. Gas Table

Refer to Table 11 to size the supply piping to minimize pressure
drop between the meter or regulator and unit. Maximum
capacity of pipe in cubic feet of gas per hour for gas pressures
of .5 w.c. or less and a pressure drop of .3 inch w.c.

Natural Gas Supply Piping Capacity Chart

(0.6 Specic gravity gas; 0.5” WC pressure drop)

*Schedule 40 iron pipe size in nominal inches

Model 1 Unit 2 Units 3 Units 4 Units

MODCON1000
@ 100’ of Pipe

MODCON1000

@ 250’ of Pipe

Model 1 Unit 2 Units 3 Units 4 Units

MODCON1700
@ 100’ of Pipe

MODCON1700

@ 250’ of Pipe

Table 11 - Gas Supply Piping Size Chart for Boilers

2” 3” 3” 4”

2 1/2” 3” 4” 4”

2 1/2” 4” 4” 5”

3” 4” 5” 5”

Ensure the pressure tap screw is properly tightened to prevent
gas leaks. Failure to do so could cause substantial property
damage, severe personal injury, or death.

The gas piping must be sized for the proper ow and length of
pipe to avoid pressure drop. The gas meter and regulator must be
properly sized for the total gas load. If you experience a pressure
drop greater than 1” w.c. (.87 kPa), the meter, regulator or gas
line may be undersized or in need of service. You can attach a
manometer to the incoming gas drip leg after removing the cap.
The gas pressure must remain between 3.5” (.87 kPa) and 14”
(3.5 kPa) during stand-by (static) mode and while in operating
(dynamic) mode.
If an in-line regulator is used, it must be a minimum of 10 feet
from the boiler. It is very important that the gas line is properly
purged by the gas supplier or utility. Failure to properly purge
the lines, or improper line sizing, will result in ignition failure.
This problem is especially noticeable in NEW LP installations
and empty tank situations. This situation can also occur
when a utility company shuts o service to an area to provide
maintenance to their lines. This gas valve must not be replaced
with a conventional gas valve under any circumstances.

DO NOT adjust or attempt to measure gas valve outlet pressure.
The gas valve is factory-set for the correct outlet pressure and
requires no eld adjustment. Attempts by the installer to adjust
or measure the gas valve outlet pressure could result in damage
to the valve and cause substantial property damage, severe
personal injury, or death.

C. Check Inlet Gas Pressure

The gas valve is equipped with an inlet gas pressure tap that
can be used to measure the gas pressure to the unit. To check
gas pressure, perform the steps listed below:

1. IMPORTANT! Before you connect to the inlet pressure,

LP-428 Rev. 6.6.16

38

D. Boiler Gas Valve

Figure 25 - MODCON1000 Gas Valve

Do not do a gas conversion on this boiler
without an ocially approved conversion
kit and instructions supplied by HTP. Failure
to use a conversion kit when converting
the boiler to re on Natural or Propane gas
will result in extremely dangerous burner
operation, leading to re, explosion, severe
personal injury, or death.

Strain on the gas valve and ttings may result
in vibration, premature component failure
and gas leakage, and result in re, explosion,
property damage, severe personal injury, or
death.
Adjustments to the throttle screw or
oset may only be made by a qualied gas
technician using a calibrated combustion
analyzer capable of measuring CO2 and CO.
Failure to follow this instruction could result
in re, explosion, property damage, severe
personal injury, or death.

Ensure that the high gas pressure regulator is
as least 6 – 10 feet upstream of the appliance.
Failure to do so could result in substantial
property damage, severe personal injury, or
death.

Figure 26 - MODCON1700 Gas Valve

LP-428 Rev. 6.6.16

Part 8 - Start-Up Preparation

Thoroughly clean and ush any system that has used glycol
before installing the boiler. Provide the customer with a
material safety data sheet (MSDS) on the uid used.

A. Check / Control Water Chemistry

39

2. For zoned systems, ush each zone separately through a
purge valve. (If purge valves and isolation valves are not already
installed, install them to properly clean the system.)

3. Flush system until water runs clean and you are sure piping is
free of sediment.
*NOTE: It is recommended you clean heat exchanger at
least once a year to prevent lime scale buildup. Follow the
maintenance procedure to clean the heat exchanger in the
Maintenance Section of this manual.

Chemical imbalance of your water can cause severe damage
to your boiler and associated equipment, and may also
aect eciency. You may have to have your water quality
professionally analyzed to determine whether you need
to install a water softener. It is important that the water
chemistry on both the domestic hot water and central heating
sides are checked before installing the boiler, as water quality
will aect the reliability of the system. Outlined below are
those water quality parameters which need to be met in order
for the system to operate eciently for many years. Failure
of a heat exchanger due to lime scale build-up on the heating
surface, low pH or other imbalance IS NOT covered by the
warranty.

To assure extended service life, it is recommended to test
water quality prior to installation. Listed below are some
guidelines.

Do not use petroleum-based cleaning or sealing compounds
in the boiler system. Damage to elastomer seals and gaskets
in the system could occur, resulting in substantial property
damage.

Sodium less than 20 mGL
Water pH between 6.0 and 8.0

1. Maintain boiler water pH between 6.0 and 8.0. Check
with litmus paper or have it chemically analyzed by a water
treatment company.

2. If the pH diers from above, consult local water treatment
company for treatment needed.

Hardness less than 7 grains

Consult local water treatment companies for unusually hard
water areas (above 7 grains hardness).

Chlorine concentration less than 100 ppm

1. Using chlorinated fresh water should be acceptable since
drinking water chlorine levels are typically less than 5 ppm.

2. Do not connect the boiler to directly heat a swimming pool
or spa water.

3. Do not ll boiler or operate with water containing chlorine
in excess of 100 ppm.

Hardness: Less than 7 grains
Chloride Levels: Less than 100 ppm
pH Levels: 6-8
TDS: Less than 2000 ppm
Sodium: Less than 20 mGL

Clean system to remove sediment*

1. You must thoroughly ush the system (without boiler
connected) to remove sediment. The high-eciency heat
exchanger can be damaged by buildup or corrosion due to
sediment.

Test/replace freeze protection uid

1. For systems using freeze protection uids, follow uid
manufacturer’s instructions to verify inhibitor level and that
other uid characteristics are satisfactory.

2. Freeze protection uid must be replaced periodically due to
degradation of inhibitors over time. Follow all uid manufacturer
instructions.

NOTE: Boiler failure due to improper water chemistry is not
covered by warranty.

B. Check for Gas Leaks

Before starting the boiler, and during initial operation, smell
near the oor and around the boiler for gas odorant or any
unusual odor. Remove boiler front door and smell interior of
boiler enclosure. Do not proceed with startup if there is any
indication of a gas leak. Repair any leaks at once.
PROPANE BOILERS ONLY – The propane supplier mixes an
odorant with the propane to make its presence detectable. In
some instances the odorant can fade, and the gas may no longer
have an odor. Before startup (and periodically thereafter), have
the propane supplier verify the correct odorant level in the gas.

C. Freeze Protection (When Used)

NEVER use automotive or standard glycol antifreeze. Do
not use ethylene glycol made for hydronic systems. Use only
freeze-protection uids certied by uid manufacturer as
suitable for use with stainless steel boilers, veried in the uid
manufacturer’s literature. Thoroughly clean and ush any
system that has used glycol before installing the new boiler.
Provide the boiler owner with a material safety data sheet
(MSDS) on the uid used.

1. Determine the freeze protection uid quantity using total
system water content following the uid manufacturer’s
instructions. Remember to include expansion tank water
content.

2. Local codes may require back ow preventer or actual
disconnect from city water supply.

3. When using freeze protection uid with automatic ll, install
a water meter to monitor water makeup. Freeze protection uid
may leak before the water begins to leak, causing concentration
to drop, reducing the freeze protection level.

D. Condensate Removal

1. The boiler is a high eciency condensing boiler. Therefore, the
unit has a condensate drain. Condensate uid is nothing more
than water vapor, derived from combustion products, similar to
that produced by an automobile when it is initially started.
Condensation is slightly acidic (typically with a pH of 3 to 5)

LP-428 Rev. 6.6.16

40

and must be piped with the correct materials. Never pipe the
condensate using steel, copper, brass or other materials that will
be subject to corrosion. Plastic PVC or CPVC pipe are the only
approved materials.
A condensate neutralizer, if required by local authorities, can be
made up of lime crystals, marble or phosphate chips that will
neutralize the condensate. This may be done by the installer or
you may purchase a condensate neutralizer from HTP (7350P-

611).

2. The boiler is equipped with a ¾ female socket weld tting
connection that must be piped to a local drain. It is very important
that the condensate line is sloped downward away from the
boiler to a suitable inside drain. If the condensate outlet on the
appliance is lower than the drain, you must use a condensate
removal pump, available from HTP (554200). This pump is
equipped with two leads that can be connected to an alarm or
another type of warning device to alert the user of a condensate
overow, which, if not corrected, could cause property damage.

3. If a long horizontal run is used, it may be necessary to create
a vent in the horizontal run to prevent a vacuum lock in the
condensate line.

4. Do not expose the condensate to freezing temperatures.

5. It is very important you support the condensation line to
assure proper drainage.

E. Fill and Test Water System

F. Purge Air from Water System

Purge air from the system:

a. Connect a hose to the purge valve and route hose to an
area where water can drain and be seen.
b. Close the boiler or system isolation valve between the
purge valve and ll connection to the system.
c. Close zone isolation valves.
d. Open quick-ll valve on cold water make-up line.
e. Open purge valve.
f. Open the isolation valves one zone at a time. Allow water to
run through the zone, pushing out the air. Run water until no
noticeable air ow is present. Close the zone isolation valves
and proceed with the next zone. Follow this procedure until
all zones are purged.
g. Close the quick-ll water valve and purge valve and
remove the hose. Open all isolation valves. Watch the system
pressure rise to correct cold-ll pressure. It is recommended
that you put the pumps into manual operation to assist in
purging the circuits.
h. Disconnect the wires that are connected to the
THERMOSTAT terminals of the customer connection
board. Apply power to the boiler. The display will show
the temperature of the water in the boiler. Press the v and
ENTER keys simultaneously and hold for 1 second. The
display will read:

Ensure the boiler is full of water before ring the burner. Failure
to do so will damage the boiler. Such damage IS NOT covered by
warranty, and could result in property damage, severe personal
injury, or death.

1. Fill the system only after ensuring water chemistry meets the
requirements listed in this manual.

2. Close the manual and automatic air vents and boiler drain
valve.

3. Fill to the correct system pressure. Correct pressure will vary
with each application.

a. Typical cold water ll pressure for a residential system is 12
psi.
b. Pressure will rise when boiler is turned on and system water
temperature increases. Operating pressure must never exceed
the relief valve pressure setting.

4. At initial ll and during boiler startup and testing, check
system thoroughly for leaks. Repair all leaks before proceeding
further.

Eliminate all system leaks. Continual fresh make-up water will
reduce boiler life. Minerals can build up in the heat exchanger,
reducing heat transfer, overheating the heat exchanger and
causing heat exchanger failure.

5. The system may have residual substances that could aect
water chemistry. After the system has been lled and leak
tested, verify that water pH and chlorine concentrations are
acceptable by sample testing.

The central heating pump will come on. If you then press the
^ key, the central heating pump will shut o. The display will
read:

The DHW pump will come on. If the boiler is set up as a
cascade master and you then press the ^ key again, the
DHW pump will shut o. The display will read:

The system pump will come on. Use the ^ and v keys to toggle
between running each pump in the system as required to
help bleed out all entrapped air. Some good indicators that
air is removed include the absence of gurgling noises in the
pipes and pump operation becoming very quiet. Pressing ^
and v together at any time will return the boiler to normal
operation.
i. After the system has operated for ve minutes, eliminate
any residual air by using the manual air vents located
throughout the system.
j. If purge valves are not installed in the system, open manual
air vents in the system one at a time, beginning with the
lowest oor. Close vent when water squirts out. Repeat with
remaining vents.
k. Rell to correct pressure.

It is important to purge the system of air to avoid damage to
the boiler.

LP-428 Rev. 6.6.16

G. Check Thermostat Circuit(s)

1. Disconnect the two external wires connected to the boiler
thermostat terminals (low voltage terminal strip).

41

2. Connect a voltmeter across these two incoming wires
with power supplied to the thermostat circuits. Close each
thermostat, zone valve and relay in the external circuit one at
a time and check the voltmeter reading across the incoming
wires.

3. There should NEVER be a voltage reading.

4. If a voltage reading does occur under any condition, check
and correct the external wiring. (This is a common problem
when using 3-wire zone valves.)

5. Once the external thermostat circuit wiring is checked and
corrected if necessary, reconnect the external thermostat
circuit wires to the boiler low voltage terminal strip. Allow the
boiler to cycle.

H. Condensate Removal

1. The boiler is a high eciency condensing boiler. Therefore,
the unit has a condensate drain. Condensate uid is nothing
more than water vapor, derived from combustion products,
similar to that produced by an automobile when it is initially
started.
Condensation is slightly acidic (typically with a pH of 3 to 5)
and must be piped with the correct materials. Never pipe the
condensate using steel, copper, brass or other materials that
will be subject to corrosion. Plastic PVC or CPVC pipe are the
only approved materials.
A condensate neutralizer, if required by local authorities,
can be made up of lime crystals, marble or phosphate chips
that will neutralize the condensate. This may be done by the
installer or you may purchase a condensate neutralizer from
HTP (7350P-611).

2. The boiler is equipped with a ¾ female socket weld tting
connection that must be piped to a local drain. It is very
important that the condensate line is sloped downward away
from the boiler to a suitable inside drain. If the condensate
outlet on the appliance is lower than the drain, you must use a
condensate removal pump, available from HTP (554200). This
pump is equipped with two leads that can be connected to an
alarm or another type of warning device to alert the user of
a condensate overow, which, if not corrected, could cause
property damage.

3. If a long horizontal run is used, it may be necessary to create
a vent in the horizontal run to prevent a vacuum lock in the
condensate line.

4. Do not expose the condensate to freezing temperatures.

5. It is very important you support the condensation line to
assure proper drainage.

I. Final Checks Before Starting Boiler

1. Read Startup Procedures within this manual for proper
steps to start boiler. (See Startup Report to record steps for
future reference.)

2. Verify the boiler and system are full of water and all system
components are correctly set for operation.

Ensure the boiler is full of water before ring the burner.
Failure to do so will damage the boiler. Such damage IS NOT
covered by warranty, and could result in property damage,
severe personal injury, or death.

3. Fill condensate trap with water.

4. Verify electrical connections are correct and securely

attached.

5. Inspect exhaust vent and intake piping for signs of deterioration
from corrosion, physical damage or sagging. Verify exhaust vent
and intake piping are intact and correctly installed per Venting
Section and local codes.

6. Ensure both boiler power switches are activated before
running the unit.

J. Cascade System - MODCON1000 and 1700 Models

This boiler assembly is shipped factory preset to operate as a
common vented cascaded unit. If the boiler is meant to be used
as a common vented cascaded unit and additional boilers are
not to be added to the system, skip this section.

Programming the Master Boiler:

a. Pick one of the bottom boilers to be the Master Boiler.
b. Make sure there is no demand for heat being supplied to
the boiler.
c. Apply power to the Master Boiler.
d. Enter the system setting program navigation following
instructions in Part 10 of this manual.
e. Verify that cascade address function 15 is set to 0. This
makes the master boiler address 0. NOTE: The Master Boiler
MUST be addressed as 0. This establishes the unit as the
master in a cascaded system.
f. Change Function 23 to the total number of boilers in the
system (4 BOILERS for a four boiler system, 6 BOILERS for a
six boiler system, etc.)

g. Exit the installer menu.
NOTE: The temperature set point of the master must match
the follower boiler set point in order for the system to operate
properly.

Additional Connected MODCON1000 and 1700 Follower
Boilers:

NOTE: READ THE NOTES BELOW BEFORE PROGRAMMING

FOLLOWER BOILERS

• If one of the follower boilers has an indirect red water
heater connected directly to it, the address of this boiler
must be 2 or greater.

• It is recommended but not necessary to address boilers in
the order that they are wired.

• No two boilers can have the same address.

• Maximum amount of boilers in a cascaded system is eight

(8), equal to four (4) double-stacked units.

a. Make sure there is no demand for heat being supplied to
the master boiler
b. Apply power to the follower boiler you are working on.
c. Enter system settings following instructions in Part 10 of

this manual

d. Set cascade address parameter 15 to 1 for the rst follower,
2 for the second follower, etc. depending which boiler you
are programming based on the above notes. This establishes
the boiler as a follower in a cascaded system and enables
data to be transferred as needed for the system to function
at full capability.

NOTE: DO NOT select number 8.
NOTE: The top boiler in a MODCON1000 and 1700 assembly

is factory preset to 1.
e. Change “CASCADE MODE” Function 23 to COMMON
FLUE on all boilers EXCEPT the Master Boiler. This is the
default setting on the top boiler in a MODCON1000 or 1700
unit.

LP-428 Rev. 6.6.16

42

f. Exit the installer menu.
NOTE: The temperature set point of the follower must match
the master boiler set point in order for the system to operate
properly.

Part 9 - Start-Up Procedure

FOR YOUR OWN SAFETY READ BEFORE OPERATING

1. This boiler does not have a pilot. It is equipped with an
ignition device which automatically lights the burner. Do not
try to light the burner by hand.

2. BEFORE OPERATING: Smell all around the boiler area for
gas. Be sure to smell next to the oor because some gas is
heavier than air and will settle on the oor.

3. WHAT TO DO IF YOU SMELL GAS

• Do not try to light any boiler.

• Do not touch any electric switch, do not use any phone

in your building.

• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas suppliers’ instructions.

• If you cannot reach your gas supplier, call the re
department.

• Turn o the gas shuto valve (located outside the boiler)
so that the handle is crosswise to the gas pipe. If the
handle will not turn by hand, don’t try to force or repair
it, call a qualied service technician. Force or attempted
repair may result in a re or explosion.

4. Do not use this boiler if any part has been under water.
Immediately call a qualied service technician to inspect the
boiler and to replace any part of the control system and any
gas control that has been damaged.

5. The boiler shall be installed so the gas ignition system
components are protected from water (dripping, spraying,
rain, etc.) during boiler operation and service (circulator
replacement, condensate trap, control replacement, etc.)

Failure to follow these instructions could result in property

damage, serious personal injury, or death.
If you discover any evidence of a gas leak, shut down the boiler
at once. Find the leak source with a bubble test and repair
immediately. Do not start the boiler again until the leak is
repaired. Failure to comply could result in substantial property
damage, severe personal injury, or death.

A. Control Overview

The control is one of the primary safety devices of the boiler.
It monitors the safety sensors of the boiler to assure safe and
ecient operation.
The control has many features associated with system design.
This section addresses programming features, including Boiler
Settings / System Settings / Maintenance Settings and System
Diagnostics, to help in customizing your control. It is important
to fully understand control capabilities before customization,
as its factory defaults may already t your system design and
not require any adjustment at all.

B. Navigation of the Display

The display includes a two line backlit LCD readout to provide
informative messages about the operation of the boiler. Many
operating parameters can be viewed and adjusted by using
the six buttons on the display. The function of each button is

described below.
RESET – The RESET button has two functions.

– Resets any lockout error code

– Returns the user to the default display screen.
ENTER – The ENTER key is used to access parameter
programming mode. To access this mode, hold down the
ENTER key for more than 4 seconds. The readout will change
to:

ENTER MENU CODE
000

One of the zeroes will be blinking. Use the ^ v arrow keys to
change the blinking digit to the correct value. Use the < >
arrow keys to select the next digit to change and again use the
^ v keys to change the value. Repeat until the correct code is
entered. Press the ENTER key to accept the code entered. If
the code is correct, the readout will change to the appropriate
screen. If the programming code is not accepted, the readout
will continue to display as shown above.
ENTER is also used to enable a function for editing. After the
user navigates to the desired function, the user holds down
ENTER for one second. When ENTER is released, the function
value will begin to blink. The function can now be changed
using the ^ v keys. After the new value is displayed, the user
then presses ENTER for 1 second to lock the new value of the
function. The value will then stop blinking.
LEFT AND RIGHT ARROW KEYS – < > are used to navigate
between the default display, status display, analog and
cascade displays if they are enabled. The < > keys are also used
in programming modes to change between programmable
functions. It is recommended you use the Menu Maps in
the back of this manual and the detailed menu instructions
printed in this section to help in menu navigation.
UP AND DOWN ARROW KEYS – ^ v are used to navigate
between the various functions displayed in the menu. After
the function is enabled for editing by pushing the ENTER
key, the ^ v keys are used to adjust the function upward or
downward to the desired value.

C. Operating Instructions

Before operating the unit, it is important to remove the cover
and verify that the gas line and water lines are connected to
boiler and fully purged. If you smell gas, STOP; Follow the
safety instructions listed in the rst part of this section. If you
do not smell gas, follow the next steps.

1. Turn down the thermostats before applying power to the
boiler. If 0–10 volt or other inputs are used, make sure that
they are set so there is no call for heat while programming.

2. Turn on the power to the boiler or boilers if a cascade system
used.

3. Next, check the boiler settings. Adjustment and factory
defaults are outlined within this section. If a cascade system
is used, it is important that all the boilers have the same boiler
settings.

4. Next, check the system settings. Adjustments and factory
defaults are outlined within this section. If a cascade system
is used, it is important that the Master Boiler is programmed
with the correct system settings.

5. Create a demand on the boiler or boilers if a cascade system
is used. The user can monitor system functions when the
boilers are operational.

LP-428 Rev. 6.6.16

43

6. If the boilers fail to start, refer to the troubleshooting
section in the back of this manual.

D. Programming Boiler Settings

Boiler Setting Program Access

Note: Programming the boiler control is not possible when
the boiler is ring. Make sure any input which can create a
demand on the boiler, such as the tank thermostat, is turned
o, so the boiler will remain idle to allow programming.

Screen Description

To access the boiler setting program,
ENTER MENU CODE
000

ENTER MENU CODE
600

Table 12 - Boiler Setting Access

Boiler Setting Program Navigation

Once the code is conrmed, the user can start to set the
Boiler Settings. Use the arrow keys on the display to navigate
through the Boiler Settings. A blinking setting indicates the
setting can be changed. To change a setting, press ENTER.
Boiler settings can be increased by pressing ^ and decreased
by pressing v on the display. When done, press ENTER. The
setting will stop blinking and the user can move on to next
setting. Press RESET to exit programming and store settings.
Listed below are the boiler settings that can be programmed
into the control.

Screen Description

CENTRAL HEAT

o

F

180

CENTRAL DIFF SET

o

F

30

DHW SETPOINT

o

F

119

DHW DIFF SETPOINT

o

F

7

TEMP DISPLAY C OR F

o

F

Table 13 - Boiler Setting Program Navigation

Clock Settings

(NOTE: The clock will reset if the boiler is powered o for
more than a week.)

Screen Description

CLOCK MODE (12/24)
08/28/2009 Fr 9:42A

press and hold ENTER for 4 seconds

until the display shows the screen at

left.

Use the arrow keys to log in the

Boiler Menu Access Code - 600.

Press ENTER to conrm the code

and access the Boiler Setting

Program navigation menu.

Allows the user to adjust the boiler
set point from 50oF to 190oF (Factory
Default 180oF).

Adjusts the boiler dierential set
point from 5oF to 30oF (Factory
Default 30oF).

Adjusts the indirect tank set point

o

from 70
119

Adjusts the DHW dierential set
point from 1oF to 30oF (Factory
Default 7oF).

Adjusts the temperature
measurement in F = Fahrenheit to C
= Celsius (Default is Fahrenheit).

Changes the clock from 12 hour
mode (8:45 PM) to 24 hour mode
(20:45). To change to 24 hour mode,
press ENTER. The letter (A or P)
after the time will blink. Press the
up or down arrow key once and the
letter will disappear. Press ENTER to
save the new setting.

F to 185oF (Factory Default

o

F).

CLOCK HOUR
08/28/2009 Fr 10:01A

CLOCK MINUTE
08/28/2009 Fr 10:01A

CLOCK DAY OF WEEK
08/28/2009 Fr 10:01A

Screen Description

CLOCK DATE MODE
08/28/2009 Fr 10:01A

CLOCK YEAR
08/28/2009 Fr 10:01A

CLOCK MONTH
08/28/2009 Fr 10:01A

CLOCK DATE
08/28/2009 Fr 10:01A

Table 14 - Clock Setting Screens

Allows the user to adjust the hour
setting.

Adjusts the minute setting.

Adjusts the day of the week.

Allows the user to switch to
European date format (2009/08/28)
from US format (08/28/2009).

Adjusts the year setting.

Adjusts the month setting.

The clock is set.

NOTE: The internal clock does not adjust for daylight savings
time and requires manual adjustment.

E. Programming the System Setting

System Setting Program Access

Note: Programming the boiler control is not possible when the
boiler is ring. Make sure any input which can create a demand
on the boiler, such as the tank thermostat, is turned o, so the
boiler will remain idle to allow programming.

Screen Description

To access the boiler setting program,
ENTER MENU CODE
000

ENTER MENU CODE
925

Table 15 - System Setting Access

press and hold ENTER for 4 seconds

until the display shows the screen at

left.

Use the arrow keys to log in the

Boiler Menu Access Code - 925.

Press ENTER to conrm the code

and access the Boiler Setting

Program navigation menu.

F. System Setting Program Navigation

Once the System Menu Access Code is conrmed, the user can
begin to set the system setting menu. Use the < > keys on the
display to navigate through the System Settings. To change a
setting, press ENTER. System settings can be increased by
pressing ^ and decreased by pressing v on the display. When
done, press ENTER. The setting will stop blinking and you can
move on to next setting. Press RESET to exit programming and
store settings. Listed below are the boiler settings that can be
programmed into the control.

Screen Description

Function 1 Factory Program Mode

MODE
INDIRECT 1

Function 3 DHW Tank Max Temp

DHW TANK MAX TEMP

o

F 3

180

This indicates that the control is

congured correctly. Do not change

this setting.

This is the maximum temperature

that can be selected in boiler settings

for the DHW tank. Factory Default is

180oF. (Range: 95oF to 180oF)

LP-428 Rev. 6.6.16

44

Screen Description

Function 6 DHW Post Pump Time

The indirect pump has the ability to
post purge energy from the boiler
to run the pump after the set point

DHW POST PUMP TIME
0 MINUTES 6

has been achieved. Please note that
running the pump for a time greater
than 5 minutes may cause tank
energy to be released back to the
heat exchanger. Factory Default of 0
Minutes. (Range: 0 – 10 minutes)

Function 7 Warm Weather Shuto

When used with an outdoor sensor,

WARM WEATHER OFF

o

F 7

68

warm weather shut down will
disable the boiler if the programmed
outdoor temperature is exceeded.
Default: 68oF (Range: 41oF to 122oF).

Function 8 Min Outdoor Temp

MIN OUTDOOR TEMP

o

F 8

5

Sets the minimum outdoor design
temperature for the system. Default:
5oF (Range: -49oF to 32oF).

Function 9 Max Supply Temp

Sets the maximum design supply

MAX SUPPLY TEMP

o

F 9

190

temperature based on the minimum
outdoor design temperature.
Default: 190

o

190

F).

o

F (Range: 77oF to

Function 10 Max Outdoor Temp

MAX OUTDOOR TEMP

o

F 10

68

Sets the maximum outdoor design
temperature for the system design.
Default: 68oF (Range 32oF to 190oF).

Function 11 Min Supply Temp

Sets the design supply water

MIN SUPPLY TEMP

o

F 11

95

temperature based on the maximum
outdoor design temperature.
Default: 95oF (Range: 32oF to 190oF).

Function 12 Min Boiler Temp

MIN BOILER TEMP

o

F 12

68

Sets the design minimum heat
curve temperature for central heat.
Default: 68oF (Range: 32oF to 190oF).

Function 13 CH Post Pump Time

Allows the user to set the boiler
CH POST PUMP TIME
0 MINUTES 13

pump post purge time once the

thermostat is satised. Default: 0

minutes (Range: 0 – 10 minutes).

Function 14 DHW Priority

Allows the user to set the maximum

DHW PRIORITY
30 MINUTES 14

run time for the indirect red water

heater and the minimum run time

for central heating. Default: 30

minutes (Range: 0 – 60 minutes).

Function 15 Cascade Address

Bus addressing boilers (maximum

boilers allowed 8 in a cascade
CASCADE ADDRESS
0 15

system). Master Boiler address is 0

and Following Boilers are addressed

1 thru 7. Default: 0 (Range: 0 – 8).

NOTE: DO NOT USE ADDRESS 8.

Function 16 Optional Inputs

Allows the user to select optional

OPTIONAL INPUT
RETURN SEN 16

inputs to control or monitor the
system. Default: RETURN (Range:
O / Booster Board / 0-10 Volt / DHW
Sensor / Return Sen).

Screen Description

Function 17 0-10 Volt Function

Control boiler modulation through
0-10 VOLT FUNCTION
TEMPERATURE 17

temperature control. Factory

Default = Temperature (Range:

Temperature or Fan Speed).

Function 18 Step Modulation Mode

Allows the user to turn ON the step

modulation, which regulates burner

output in six steps at one minute
STEP MODULATE MODE
ON 18

intervals. Step modulation will start

at the last modulation rate of the

boiler and work up one minute at a

time. Default: OFF (Selection: OFF

or ON).

Function 19 Boiler DHW Temp

Allows the user to program the

BOILER SUPPLY DHW

o

F 19

180

boiler supply water temperature to

the indirect heat exchanger during

a demand cycle. Default: 180

(Range: 119

o

F to 190oF).

Function 20 Water Safety Input

The user can select various water

WATER SAFETY INPUT
WATER PRESSURE 20

safety inputs used in the boiler

system. Default: Flow Switch

(Range: None / Low Water Cut O /

Flow Switch / Water Pressure).

Function 21 Error Outdoor Sensor

Allows the user to set the control

to display an error message if an
ERROR OUTD SENSOR
OFF 21

outdoor sensor is open or shorted.

NOTE: This error does not stop the

boiler from running. Factory Default:

OFF (Range: ON / OFF / PHOEN ON).

Function 22 Adjust Boiler Output %

ADJ BOILER OUTPUT
100% 22

Adjusts the boiler output down

from 100% to 50%. Factory Default:

100%. (Range: 100% – 50%)

o

F

LP-428 Rev. 6.6.16

45

Function 23 Cascade Mode

Allows the user to select the cascade
mode. If one or more 1000 or 1700
units are cascaded in a common

Top Boiler

vent manifold, select the number
of individual cascaded boilers in

CASCADE MODE
COMMON FLUE 23

the system on the cascade master
(2 BOILERS if a single MOD CON
1700, 6 BOILERS if three MOD CON
1000s, etc.) On cascade followers
in a common vent system, select
COMMON FLUE to establish a
cascaded system WITH common
vent. Factory Default: 2 BOILERS
on Cascade Master (bottom boiler),

Bottom Boiler

CASCADE MODE
2 BOILER 23

COMMON FLUE on Cascade
Follower (top boiler). Range: ALL
926 / 2 – 8 BOILERS [on cascade
master ONLY] / COMMON FLUE [on
cascade followers ONLY]). NOTE: All
MOD CON 1000 and 1700 boilers are
to be congured as COMMON VENT
systems.

Function 24 Cascade Rotation

Sets the amount of hours before

the rst boiler in the cascade ring
CASCADE ROTATION
48 HOURS 24

rotation will be changed. NOTE: If

this is set to 0, the ring order of the

boilers will not rotate. Default: 48

hours (Range: 0 – 240 hours).

Function 25 Cascade DHW Mode

NOT USED
NOT USED 25

Not applicable on this product.

Screen Description

Function 26 System Freeze Protection

NOTE: This parameter is only

present if the boiler is a cascade

master. Allows the user to set the
SYS FREEZE PROT
PROTECT OFF 26

freeze protection when a system

pump is used. Factory Default: OFF.

Selection of temperature activates

freeze protection. (Range: OFF,

o

F – 104oF).

-40

Function 27 Error System Sensor

Sets the control to display an error

message if the system sensor is
ERROR SYSTEM SENS
ON 27

open or shorted. NOTE: This error

does not stop the boiler (or boilers)

from running. Factory Default: ON

(Range: ON / OFF).

Function 28 Freeze Protection

FREEZE PROTECTION
ON 28

Allows the user to set freeze

protection on the boiler. Factory

Default: ON (Range: ON / OFF).

Function 29 DHW Modulation Mode

This parameter controls how
the boiler modulates for a DHW
demand. In NORMAL MOD mode,
the boiler will modulate down
from high re when there is a DHW

demand. In LOW MOD mode, the
DHW MODULATE MODE
NORMAL MOD 29

boiler will modulate up from low

re when there is a DHW demand.

This mode is useful to minimize

short cycling when a large boiler

and small indirect tank are used

together. Factory Default: NORMAL

MOD (Range: NORMAL MOD / LOW

MOD).

Function 30 Extra Boiler Mode

Allows for a non HTP boiler to

be controlled when the cascade
EXTRA BOILER MODE
OFF 30

output has risen above the percent

of the cascade ring rate set in this

parameter. Factory Default: O

(Range: 50% - 100%).

Function 31 System Sensor Mode

Suppresses the ‘NO FOLLOWER’

SYSTEM SENSOR MODE
OFF 31

display message if the boiler is used

as a cascade master boiler with no

follower boilers connected. Factory

Default: OFF (Range: ON / OFF).

Function 32 Service Schedule

Selects a service date or time based

on the boiler run hours to program

SERVICE SCHEDULE
OFF 32

the boiler maintenance schedule.

Factory Default: OFF (Range: Date

or Run Hours). NOTE: Without

setting this function, Functions

33/34/35/36 will not display.

Function 37 Modbus Mode

Enables Modbus Mode on the

appliance. Factory Default: OFF

(Range: OFF, ON, AUTO). NOTE:

Turning Modbus Mode “ON” will open

a number of additional parameters

to customize Modbus installation.
MODBUS MODE
OFF 37

See Modbus Instructions (lp-372) for

details. NOTE: Turning this Mode

“ON” without a connected and

powered Modbus communication

adapter (p/n 7350P-629) will result

in improper appliance operation.

Service calls associated with this

ARE NOT covered by warranty.

Table 16 - System Setting Program Navigation

LP-428 Rev. 6.6.16

46

NOTE: For the following functions, you must have your

maintenance function turned on.
To change these functions, press ENTER. The left most digit
will begin to blink. Use the ^ or v arrows to change the digit.
Use the < > arrow keys to switch between digits. When you’ve
made your selection, press ENTER again.

Screen Description

Function 33 Year

SERVICE SCHEDULE
YEAR 00/00/2000 33

SERVICE SCHEDULE

000000 33

10000’s

Function 34 Month

SERVICE SCHEDULE
MONTH 00/00/200 0 34

SERVICE SCHEDULE
10000’s 00

Function 35 Day

SERVICE SCHEDULE
DAY 00/00/2000 35

SERVICE SCHEDULE
10000’s 0000

Function 36 Telephone

TELEPHONE #
000 000 0000 36

Table 17 - Maintenance Reminder Function Screens

0000 34

00 35

Allows the user to set the year of the
next service reminder.

Hours

Allows the user to set the left two
digits of the amount of run hours
before next service reminder.

If the date function was selected,
this function programs the month. If
you selected the run hour function,
you will need to program 10,000
hours, if required.

Hours

Allows the user to set the middle
two digits of the amount of run
hours before next service reminder.

Sets the day of next service
reminder.

Hours

Sets the two right digits of the
amount of run hours for the next
service reminder.

Allows the user to input a telephone
number that will display when
maintenance is required.

G. Resetting the Maintenance Schedule

When the system control ashes MAINTENANCE REQUIRED,
it is advisable that you call for service. After the service is
performed, reset the schedule for the next required service by
using the following steps.
Press ENTER on the display for 3 seconds. The Menu code
will appear as 000. This does not change. Press ENTER again.
SERVICE SCHEDULE RESET will be displayed. Using the > key
scroll to the selection of year or hours. Press ENTER to reset
the selected Service Schedule. To change a setting, press

ENTER. Press the ^ and v keys to make adjustments. Press
ENTER when reset is complete.

Part 10 - Start-Up Procedures for the Installer

A. Boiler Control Status Menu

The boiler control also has the ability to review system
status. To access the status screens, press >. Once the rst
value is displayed, press ^ and v to scroll through additional
information. At any point press RESET to exit the status
screens.

LP-428 Rev. 6.6.16

Table 18 - Heating Curve - NOTE: The user can adjust the heat curve
down by lowering the central heating temperature.

Screen Description

This is the rst screen that appears
after pressing >, and shows the
actual temperatures measured

o

F

SUPPLY SEN 180
RETURN SEN 150oF

Press v once.

by the supply and return sensors.
NOTE: If the boiler is congured to
use a 0 – 10 volt input, the return
sensor is disabled and the second
line of the display will be blank.

47

CH SET 180oF
SUPPLY SEN 122

o

Press v once.

CH DEMA ND OFF
BOILER

Press v once.

0-10 SIGNL ON
*

Press v once.

CAS SET 190

o

SYSTEM 112oF

Press v once.

DHW SET 119

o

DHW 117oF

Press v once.

OUTDO OR 11

o

FLUE 95oF

Press v once.

FLAME 0.0uA
FAN SPEED 3497 RPM

Press v once.

0-10 V 0.0V
*

The screen displays the current
central heating temperature set
point on the top line. NOTE: This
temperature set point may vary
from what was set in the boiler

F

settings if an outdoor sensor is used.
The actual temperature measured
by the supply sensor is displayed on
the bottom line.

This screen displays the central heat
demand set for the cascade system.

Shows if 0-10 volt is enabled.

This screen appears only when the
boiler is set as a Master Boiler.

This screen displays the cascade set
point (maximum 190oF) on the top

F

line. The system sensor reading is
on the second line. The control will
cascade the boilers up to this set
point depending on demand.

Displays the current tank
temperature set point on the top line.
The actual temperature measured
by the tank or return sensor (HTP
7250P-325) is displayed on the

F

bottom line. If a mechanical aquastat
is used in place of the recommended
sensor, the second line will display
‘OFF’ in place of the temperature
if the aquastat measures close to
its set temperature, or ‘ON’ if the
aquastat temperature is too low.

The current outdoor temperature
is displayed on the top line. If there
is no outdoor sensor connected
to the boiler, this line will display

F

“OFF” in place of the temperature.
If the outdoor sensor is shorted,
this line will display “ON” in place
of the temperature. The second
line displays the current boiler ue
temperature.

This screen displays boiler ame
current on the top line. The second
line displays boiler fan speed.

The top line displays the voltage on
the optional input. This voltage is
only relevant if an external 0-10 volt
signal is being used to control the
boiler.

Press v once.

This display shows the status of
the communication bus between
multiple boilers. If in a single boiler
conguration, the display will

BUS COMM NO CONN

show ‘NO CONN’. In a multiple
boiler conguration, if this is the
Master Boiler and other boilers are
connected to the communication
bus and powered, this screen will
show the address of each boiler
connected to the bus.

Press v once.

The top line indicates the amount of

hours the boiler has been powered
POWER ON 0H
CH ON 0H

over its life. The second line indicates

how many hours the burner has

been on for central heat demand

over its life.

Press v once.

The top line indicates the hours the

burner has been on for hot water
DHW ON 0H
GOOD IGNIT 1X

demand over the boiler’s life. The

second line indicates how many

times the burner has successfully

ignited over the boiler’s life.

Press v once.

SYS CH ON 0H
SYS DHW ON 0H

This screen displays how many hours

the boiler has run to meet central

heat and DHW demand.

Table 19 - Boiler Control Status Menu Screens

The next ten screens display the last ten boiler lockout faults.
Press v to scroll through the faults from most recent to oldest.

Screen Description

This screen displays the most recent

boiler control lockout fault. The

FAULT HISTORY 1
07/27/2009 Mo 5:19A

Press v once.

FAULT HISTORY 2
08/28/2009 Fr 5:19A

Press v once.

FAULT HISTORY 3
08/28/2009 Fr 5:19A

top line will alternate between the

words ‘FAULT HISTORY’ and the

fault code encountered. The bottom

line displays the date and time the

fault occurred.

This screen displays the second

oldest boiler control lockout fault.

The top line will alternate between

the words ‘FAULT HISTORY’ and

the actual fault encountered. The

bottom line will display the date and

time that the fault occurred.

This screen displays the third oldest

boiler control lockout fault. The top

line will alternate between the words

‘FAULT HISTORY’ and the actual

fault encountered. The bottom line

will display the date and time that

the fault occurred.

LP-428 Rev. 6.6.16

48

Press v once.

FAULT HISTORY 4
08/28/2009 Fr 5:19A

Press v once.

FAULT HISTORY 5
08/28/2009 Fr 5:19A

Press v once.

FAULT HISTORY 6
08/28/2009 Fr 5:19A

Press v once.

FAULT HISTORY 7
08/28/2009 Fr 5:19A

Press v once.

FAULT HISTORY 8
08/28/2009 Fr 5:19A

Press v once.

FAULT HISTORY 9
08/28/2009 Fr 5:19A

FAU LT HISTORY 10
08/28/2009 Fr 5:19A

Table 20 - Boiler Fault Screens

This screen displays the fourth
oldest boiler control lockout fault.
The top line will alternate between
the words ‘FAULT HISTORY’ and
the actual fault encountered. The
bottom line will display the date and
time that the fault occurred.

This screen displays the fth oldest
boiler control lockout fault. The top
line will alternate between the words
‘FAULT HISTORY’ and the actual
fault encountered. The bottom line
will display the date and time that
the fault occurred.

This screen displays the sixth oldest
boiler control lockout fault. The top
line will alternate between the words
‘FAULT HISTORY’ and the actual
fault encountered. The bottom line
will display the date and time that
the fault occurred.

This screen displays the seventh
oldest boiler control lockout fault.
The top line will alternate between
the words ‘FAULT HISTORY’ and
the actual fault encountered. The
bottom line will display the date and
time that the fault occurred.

This screen displays the eighth
oldest boiler control lockout fault.
The top line will alternate between
the words ‘FAULT HISTORY’ and
the actual fault encountered. The
bottom line will display the date and
time that the fault occurred.

This screen displays the ninth oldest
boiler control lockout fault. The top
line will alternate between the words
‘FAULT HISTORY’ and the actual
fault encountered. The bottom line
will display the date and time that
the fault occurred.

This screen displays the tenth oldest
boiler control lockout fault. The top
line will alternate between the words
‘FAULT HISTORY’ and the actual
fault encountered. The bottom line
will display the date and time that
the fault occurred.

B. Cascade Menu

This menu is accessed by pressing < at the default menu or > at
the status menu of the Master Boiler.

Screen Description

This screen displays when the boiler
is congured as a Cascade Master
and the system is ready to accept
a demand for heat. The second line

CASCADE MASTER READY
SYS PUMP OFF

CASCADE NO FOLLOWER
SYS PUMP OFF

CASCADE NO SENSOR
SYS PUMP OFF

CASCADE TT 0123 567
SYS PUMP ON 12:47P

indicates the cascade system pump
output status. This screen alternates
with the default screen every 5
seconds or can be accessed by

pressing the
screen.

This screen displays when the boiler
is congured as a Master Boiler and
there are no connected follower
boilers, or the follower boilers are not
powered. The second line indicates
cascade system pump output status.
This screen alternates with the
default screen every 5 seconds or

can be accessed by pressing the
key from the default screen.

This screen displays when the boiler
is congured as a Master Boiler and
there is no system temperature
sensor connected or the system
sensor is defective. The cascade
system will still function in this
situation with reduced eciency.
All boilers will run simultaneously
rather than in a staged fashion.
The second line indicates cascade
system pump output status. This
screen will alternate with the default
screen every 5 seconds or can be

accessed by pressing the
the default screen.

This screen displays information
about cascade status. The TT in
the center of the top line shows
that cascade demand is coming
from TT contact being closed. You
may also see DHW if the demand
is from a DHW sensor, or 0-10 if
the demand is from a 0-10 volt
input. The following numbers
show which boiler addresses are
currently communicating to the
master. If a boiler address is not
used or communicating, the number
will not display. In the example to
the left, boiler address #4 is not
communicating. When a boiler in the
system is ring, its address number
will alternate with a ‘.’ to signify it
is ring. The bottom line shows the
status of the system pump output
contacts.

< key from the default

< key from

<

LP-428 Rev. 6.6.16

49

Press v once.

This screen displays overall cascade
power output. The range of this
value is the number of boilers

CASCADE PW R 100%
PRESE NT 01 2345 67

Press v once.

CASCADE SYST 1 18
CAS CADE SE T 19 0oF

Press v once.

BOILER 0 100%
BOILER 1 56%

Press v once.

BOILER 2 0%
BOILER 3 0%

Press v once.

BOILER 4 0%
BOILER 5 0%

Press v once.

BOILER 6 0%
BOILER 7 0%

Table 23 - Cascade Menu

communicating with the Master x

100. For example, if 8 boilers are
connected and ring, the maximum
cascade power is 800%. The second
line shows which boiler addresses
are communicating with the Master.

This screen displays current system

o

F

temperature sensor reading on the
top line and the cascade system
temperature setting on the bottom.

This screen displays the current
cascade power demand output
on a per connected boiler basis
for boilers addressed as 0 and 1.
In the example, boiler 0 is being
commanded to re at 100% and
boiler 1 at 56%. If this were a 2 boiler
system, the ‘CASCADE PWR’ screen
above would read 156%.

This screen displays the current
cascade power demand output on a
per connected boiler basis for boilers
addressed as 2 and 3.

This screen displays the current
cascade power demand output on a
per connected boiler basis for boilers
addressed as 4 and 5.

This screen displays the current
cascade power demand output on a
per connected boiler basis for boilers
addressed as 6 and 7.

C. Boiler Test Mode

This function is intended to simplify gas adjustment. The
following tables include recommended combustion settings
by fuel type and boiler fan speeds. Automatic modulation does
not take place while the controller is in Test Mode. However,
the boilers will modulate down if the program set point is
reached while running in Test Mode. It is recommended to
enter Test Mode with the largest load possible to create such a
heat demand that Test Mode will not be interrupted. To enter
Test Mode press ^ and ENTER simultaneously.
NOTE: The boiler will automatically exit Test Mode after 20
minutes of operation.
To leave Test Mode press ^ and v simultaneously.

SERVICE RUN 3400 RPM
PUMP ON 4:49P

Combustion Settings on All Models

Fan Speed

Carbon

Monoxide

(CO) PPM

Carbon
Dioxide
(CO2) %

Table 21 - Combustion Settings - All Models

Model Ignition Min Max

1000 3000 1950 7200

1700 3000 2200 6800

Table 22 - Fan Speeds

Natural Gas (NG) Propane (LP)

Low Ignition High Low Ignition High

5-50 35-100

8-10 8 1/2-10 1/2 9-10 1/2 9 1/2-11

<150 5-50 35-100 <150

Fan Speeds

Part 11 - Troubleshooting

A. Boiler Error and Fault Codes

If any of the sensors detect an abnormal condition, or an internal
component fails during the operation of the boiler, the display may
show an error message and error code. This message and code may
be the result of a temporary condition, in which case the display
will revert to its normal readout when the condition is corrected, or
it may be a condition that the controller has evaluated as not safe
to restart the boiler. In this case, the boiler control will be locked
out, the red FAULT light will be lit, and the message “LOCKOUT”
will be displayed on the readout in the lower line.
The boiler will not start until a qualied technician has repaired
the boiler and pressed the RESET button for more than 1 second.
If there is an error message displayed on the readout, and the
message “LOCKOUT” is not displayed and the FAULT light is not
lit, then the message is the result of a temporary condition and will
disappear when the problem corrects itself.
IMPORTANT NOTE: If you see error messages on your display
readout, call a technician immediately, since the message may
indicate a more serious problem will occur soon.

B. Boiler Error

The controller will display an error code and message when
an error condition occurs. These error codes, descriptions, and
recommended corrective actions are described in Section D.

C. Boiler Fault

1. The controller will illuminate the red “FAULT” indication light
and display a fault code and message when a fault condition
occurs. The alarm output will also activate. Most fault conditions
cause the CH pump to run in an attempt to cool the boiler.

2. Note the displayed fault code and refer to Section D for an
explanation of the message along with several suggestions for
corrective actions.

3. Press RESET to clear the fault and resume operation. Be sure
to observe the operation of the unit for a period of time to assure
correct operation and no reoccurrence of fault message.

LP-428 Rev. 6.6.16

50

When servicing or replacing components that are in direct
contact with boiler water, be certain that:

• There is no pressure in the boiler. (Pull the release on
the relief valve. Do not depend on the pressure gauge
reading.

• The boiler water is not hot.

• The electrical power is disconnected.

• The gas is shut o.

Failure to make these checks could result in substantial
property damage, serious personal injury, or death.

If overheating occurs or the gas supply fails to shut o, do not
turn o electrical power to the circulating pump. This may

DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN
SUBMERGED IN WATER. Immediately call a qualied service

technician. The appliance MUST BE replaced if it has been
submerged. Attempting to operate an appliance 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 appliance could result in
property damage, severe personal injury, or death.
NOTE: Appliance damage due to ood or submersion is
considered an Act of God, and IS NOT covered under product
warranty.

aggravate the problem and increase the likelihood of boiler
damage. Instead, shut o the gas supply to the boiler at the
gas service valve. Failure to do so may result in property
damage, personal injury, or death.

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

NOTE: If system return temperatures are maintained below the
dew point, condensation will form on the inside of the boiler
cabinet and cause some internal sheet metal components to
rust.

D. User Interface Display

Cascade Control Fault Codes

Screen Description Possible Remedy

E03 indicates a problem with the system
sensor circuit. The circuit could be open or
shorted. Possible reasons for this error are:
There is no system sensor connected to the

Master Boiler.
SYS SUPPLY SENSOR
PUMP OFF E03

TEMPER BLOCKING
PUMP ON TT

LOW WATER LEVEL
PUMP OFF LEO

HIGH FLUE PRESS FLU
PUMP ON

WARNING: Do not use jumper to remedy an FLU error. Faulty switch MUST be replaced. Failure to follow this instruction could result in
serious personal injury or death.

The system sensor is faulty.

There is a short circuit in the system sensor

wiring; possibly from a staple placed through

the wire, or damage to the wire causing both

conductors to touch.

The system sensor wiring is open due to

defect or damage.

TT indicates there is a demand for heat on

the boiler, the pump is powered on, and the

supply sensor temperature is too high for

the boiler to ignite. This occurs because the

water temperature measured by the supply

sensor is higher than the tank temperature –

ignition di setting.

Water level in the boiler is low.

FLU indicates excessive ue pressure. This

code resets automatically after the high

pressure condition is resolved. The second

line indicates pump status.

Disconnect the system sensor from the wiring and measure it’s
resistance. Compare the measured resistance to the table in
this manual to see if it corresponds to the temperature of the
sensor. If the resistance does not agree with the sensor, replace
the sensor. If the sensor is OK, disconnect the sensor wiring from
both the boiler and the sensor and check continuity using an
ohmmeter. Repair or replace as necessary.
If this error is present, the boilers in the cascaded group will run
and ignite simultaneously when there is a heat demand. Each
boiler will modulate to maintain set point temperature on its
own supply sensor. This code automatically resets when repair
is complete. This code will not display if system setting function
ERROR SYSTEM SENS is set to OFF.

This message will stay present until the water temperature
measured by the supply sensor is less than the tank temperature
– ignition di setting.

1. Check boiler feed water system to be sure it is supplying make­up water to the boiler system.

2. Be sure all air is bled from the system.

3. Check for leaks in the boiler and system piping and repair as
necessary.

4. Inspect low level switch and wiring for damage and repair as
necessary.

1. Assure the ue is not blocked.

2. Check the switch wiring by applying a jumper in place of the
switch. If the code clears with the jumper in place, REPLACE the
ue switch and connect the wires to the new switch BEFORE
running boiler.

LP-428 Rev. 6.6.16

24 VOLT LOW LOU
PUMP ON

WATER HIGH TEMP F00
PUMP ON

Screen Description Possible Remedy

FLUE TEMP/WAT LV F01
PUMP ON

LOU indicates the 24 volt power supply on
the control is damaged or overloaded. This
code resets automatically if it is the result
of an overload and the overload condition
is removed. The second line indicates the
status of the pump. Note that while 24 volt
power is low, the pump output will be on.

F00 indicates the water in the boiler has
overheated. The boiler will not restart until it
cools suciently and a technician determines
and repairs the cause of overheating and
pushes RESET on the display. This is a serious
safety issue as indicated by the illuminated
red light and the word LOCKOUT ashing
on the display. During this lockout fault, the
pump will be on in an eort to cool the boiler
down.

This code indicates that one of the safety
interlock switches present in the unit has
tripped. There are several interlock switches
that could possibly trip and cause this error.
The following four switches are installed and
are standard equipment in all boilers.

1. Flue ECO – Trips if the ue temperature
is excessive. This switch has to be manually
reset.

2. Boiler module thermal fuse – Trips if there
is excessive heat on the rear of the heat
exchanger.

3. Boiler module front temperature switch ­Trips if there is excessive heat on the front of
the heat exchanger.

4. Blocked vent pressure switch (BVPS) – This
switch trips if there is excessive pressure in
the ue and automatically resets.
The following switches are optional
equipment that may be installed on
MODCON1000 and MODCON1700. These
devices have indicator lights on them
showing of they are tripped.

1. High gas pressure switch – This switch
trips if there is excessive gas pressure on
the outlet side of the gas valve and must be
manually reset.

2. Low gas pressure switch – This switch trips
if there is low gas pressure on the inlet side
of the gas valve and must be manually reset.

3. UL 353 Low Water Cuto – This device trips
if the water level in the boiler is low and must
be manually reset.

51

1. Check line voltage. It must be between 100 and 128 volts.

2. If available, connect a PC and use HTP service software to check
the 24v supply display in the lower left corner of the screen. The
number displayed here must be greater than 128 and should be
no greater than 250. Use this as a troubleshooting guide as you
follow the steps below.

3. Remove the 10 pin Molex connector from the customer
connection board. If the message clears the problem is with
external sensor wiring. Examine the external sensor wiring for
shorts to the ground, repairing as necessary. If the message is still
present and the boiler is so equipped, disconnect the UL 353 low
water cut-o to see if the message clears. Replace the faulty part.
Check the low voltage wire harness in boiler for shorts to ground.

4. If a message only occurs when the burner tries to light, check
the gas valve for excessive current draw.

5. If a message is present when the low voltage harness is
disconnected from the 926 control board, replace the 926
control board.

1. Check circulator pump operation.

2. If the circulator pump is running, ensure there is water in the
system and that the water is moving through the system as
intended. Ensure that all correct ball valves and or zone valves
are open or closed as intended.

3. Observe the temperature/pressure gauge. If the water is not
too hot and this message is displayed, check the wiring to the
water ECO sensor and repair if necessary. If the wiring is ok and
this code is still present and the water is not excessively hot,
replace the ECO sensor.

1. Check to see if the boiler with the F01 code displayed has any
of the optional switches installed.

2. If so, check to see if the indicator light on any of the devices is
showing that they are tripped.

3. If an indicator light is illuminated, investigate the source of the
error for that particular switch.

4. If there are no optional switches or none of the indicator lights
is illuminated on the optional switches then use an ohmmeter to
test each of the standard switches one at a time. Turn the power
o to the boiler and disconnect the switch to be tested from the
boiler to determine which one has tripped.
When you nd the tripped switch investigate the cause of the
fault based on the purpose of the switch. NOTE: The common
reasons for the temperature switches to trip are a) low water ow
through the boiler, or b) poor heat transfer from the water to the
load.

5. If no switches are tripped, push RESET on the boiler. If the
boiler tries to ignite or ignites and only runs for a short time and
the F01 code returns, investigate the ue for blockage.

LP-428 Rev. 6.6.16

52

SUPPLY SENSOR F02
PUMP ON

RETURN SENSOR F03
PUMP ON

FLUE SENSOR F04
PUMP ON

Screen Description Possible Remedy

SUPPLY TEMP HIGH F05
PUMP ON

RETURN TEMP HIGH F06
PUMP ON

F02 indicates the supply temperature sensor

of the boiler has failed. The boiler will not

restart until a technician replaces the sensor

and pushes RESET on the display. This is

a serious safety issue as indicated by the

illuminated red light and the word LOCKOUT

ashing on the display. During this lockout

fault, the pump will be on.

F03 indicates the return temperature sensor

of the boiler has failed. The boiler will not

restart until a technician replaces the sensor

and pushes RESET on the display. This is

a serious safety issue as indicated by the

illuminated red light and the word LOCKOUT

ashing on the display. During this lockout

fault, the pump will be on.

F04 indicates that the ue temperature

sensor of the boiler has failed. The boiler will

not restart until a technician replaces the

sensor and pushes RESET on the display. This

is a serious safety issue as indicated by the

illuminated red light and the word LOCKOUT

ashing on the display. During this lockout

fault, the pump will be on.

F05 indicates the boiler supply temperature

is excessive. When accompanied by the

red FAULT light and LOCKOUT ashing on

the display, this code indicates the supply

sensor temperature has exceeded 230

o

F and
a serious safety issue exists. The boiler will
not restart until a technician determines and
repairs the cause of excessive temperature
and pushes RESET on the display.
If the FAULT light is not illuminated and
this message is displayed, the supply tem­perature of the boiler is at or above 210

o

F.
The message will clear automatically when
the temperature drops below 194oF. During
the time that this fault is displayed, the pump
will be on.

This display indicates that the boiler
return temperature is excessive. When
accompanied by the red FAULT light and
LOCKOUT ashing on the display, this code
indicates that the return sensor temperature
has exceeded 230

o

F and a serious safety
issue exists. The boiler will not restart until a
technician determines and repairs the cause
of excessive temperature and pushes RESET
on the display.
If the red FAULT light is not illuminated and
this message is displayed, then the return
temperature of the boiler is at or above
210oF. The message will clear automatically
when the temperature drops below 194oF.
During the time that this message or lockout
fault is displayed, the pump will be on.

1. Check the electrical connection to the thermistor on the outlet
manifold. Verify 5 VDC by checking the Molex connector. If
there is no 5 VDC, check the harness. If harness is OK, replace
the control. Verify thermistor values by referencing chart in this
manual.

2. Replace thermistor if necessary.
NOTE: The boiler will reset automatically once the fault is
corrected.

1. Check circulator pump operation.

2. Ensure adequate ow through the boiler by accessing the
status menu and determining there is less than a 50

o

F rise from

the return thermistor to the supply thermistor.

3. Troubleshoot thermistor by following the steps in F02.

Inspect the ue sensor for physical damage or corrosion and
replace it if necessary. Check the electrical connection to the ue
sensor and repair as necessary. Measure the resistance of the
sensor and refer to the sensor resistance table in this manual. The
temperature on the chart should be close to the temperature in
the ue. If not, replace the ue sensor.

1. Check circulator pump operation.

2. Ensure adequate ow through the boiler by accessing the
status menu and determining there is less than a 50°F rise from
the return thermistor to the supply thermistor.

3. Check the direction of ow o the boiler circulator. (See Piping
Details in this manual.)

4. Troubleshoot the thermistor by following steps in F02.

1. Check circulator pump operation.

2. Ensure adequate ow through the boiler by accessing the
status menu and determining there is less than a 50°F rise from
the return thermistor to the supply thermistor.

3. Check the direction of ow on boiler circulator. (See Piping
Details in this manual.)

4. Troubleshoot thermistor by following steps in F02.

LP-428 Rev. 6.6.16

NO FLAME ON IGN F09
PUMP ON

FLAME LOSS F10
PUMP ON

FALSE FLAME SIG F11
PUMP ON

FAN SPEED ERROR F13
PUMP ON

The boiler tried to ignite four times during
one heat call and failed. This is a serious
safety issue as indicated by the illuminated
red light and the word LOCKOUT ashing on
the display. The boiler will not restart until a
technician determines and repairs the cause
of ignition failure and pushes RESET on the
display. During this lockout fault, the pump
will remain on.

The ame was lost 3 times while the boiler
was ring during 1 demand call. This is a
serious safety issue as indicated by the
illuminated red light and the word LOCKOUT
ashing on the display. The boiler will not
restart until a technician determines and
repairs the cause of ame loss and pushes
RESET on the display. During this lockout
fault, the pump will be on.

There is ame when the control is not telling
the boiler to run. This is a serious safety issue
as indicated by the illuminated red light and
the word LOCKOUT ashing on the display.
The boiler will not restart until a technician
determines and repairs the cause and pushes
RESET on the display. During this lockout
fault, the pump will be on.

The fan is not running at the speed
determined by the control. Fan speed has
been more than 30% faster or slower than
the commanded speed for more than 10
seconds. This is a serious safety issue as
indicated by the illuminated red light and
the word LOCKOUT ashing on the display
.This boiler will not restart until a technician
determines and repairs the cause and pushes
RESET on the display. During this lockout
fault, the pump will be on.

53

1. Watch the igniter through the observation window.

2. If there is no spark, check the spark electrode for the proper
.196” (5.0 mm ± 1mm) gap. See below.

3. Remove any corrosion from the spark electrode and ame
rectier probe.

4. If there is a spark but no ame, check the gas supply to the
boiler.

5. If there is a ame, check the ame sensor.

6. Check any ue blockage or condensate blocks.

1. Monitor gas pressure to the unit while in operation.

2. Assure the ame is stable when lit.

3. Check if the display readout changes from “GAS VALVE ON” to
“RUN” within a few seconds of boiler ignites.

4. Check the FLAME signal on the display. It should be above 1.0
when the boiler is ring.

5. If the signal reads less than 1 microampere, clean the ame
rectier and spark probe.

6. If the problem persists and the ‘FLAME” signal is still less than

1.0, replace the ame probe and spark igniter probe.

7. The ame signal should be steady after the boiler has been
ring for 1 minute and is normally at 5.0 to 9.0. If the ame signal
is not steady, disassemble the burner door and check the burner
and its sealing gaskets.

1. Look into window. If there is ame, turn the gas o to the unit
at the service valve and replace the gas valve.

2. If the ame signal on the status menu is greater than 1.0 when
the burner is not lit, replace the spark ignitor and the ame
rectication probe.

3. If the ame signal is not present after turning o the gas
supply, check the gas valve electrical connection.

4. Check for condensate backup. Repair condensate system
as necessary. If condensate has partially lled the combustion
chamber, the refractory wall may be damaged and should be
replaced.

5. Turn the gas on at the service valve after corrective action is
taken.

6. If the refractory wall falls against the rectier probe, it may
conduct the signal to ground, giving a false reading.

1. Check the combustion fan wiring.

2. Measure DC voltage from the red fan wire to ground while it is
connected to the fan. It should be between 24 and 40 volts. If it is
lower than 24 volts, check for excessive external loads connected
to the boiler sensor terminals

3. Disconnect the 5 pin plug from the fan and check the voltage
on the red wire again. If it is now between 24-40 volts, replace
the fan. If it is still below 24 volts replace the boiler control board.

LP-428 Rev. 6.6.16

54

FLAP CLOSED F15 Flapper valve physically stuck closed.

FLAP OPEN F16 Flapper valve physically stuck open.

The condensate trap is full. This is a serious
safety issue as indicated by the illuminated

CONDENSATE FULL F20
PUMP OFF

Screen Description Possible Remedy

PROGRAM ERROR F31
PUMP OFF

CONTROL PROGRAMED
PP

OUTDOOR SENSOR FOU
PUMP ON 1:45P

The following blocking codes will block operation until the control determines the situation safe for boiler operation.

FLUE TEMP HIGH E07
PUMP OFF TIME

COMMON FLUE BLOCK
E16

red light and the word LOCKOUT ashing on
the display. The boiler will not restart until a
technician determines and repairs the cause
and pushes RESET on the display. During this
lockout fault, the pump will be o.

There was an error while programming
the control and the memory is corrupt. The
boiler control will not function in this state
and the pump will be o as indicated on
the bottom line. This error only occurs if a
technician is programming the control and
the programming function fails. The only way
to recover from this error is to reprogram the
control. If this error occurs at any time other
than when a technician is servicing the boiler,
the control has failed and must be replaced
by a qualied technician.

The control has been programmed by a
technician or the factory. After programming,
the control is left in a locked out mode.

There is an issue with the outdoor sensor. It
is shorted, damaged, or disconnected from
the boiler.

E07 indicates the ue sensor temperature
is excessive and above 210

o

F. When E07 is
displayed the boiler will not respond to a
demand for heat. When the ue temperature
decreases below 194oF, the display will return
to normal and allow the boiler to respond to
a heat demand. The bottom line indicates the
status of the pump. The pump will remain o
when this error is displayed.

Common ue blocking or apper valve
feedback failure.

1. Check ue system for obstructions.

2. Check proper communication between boilers.

3. Check operation of apper valve.

4. Check wiring between valve and controller.

5. Replace valve-apper.

1. Check ue system for obstructions.

2. Check proper communication between boilers.

3. Check operation of apper valve.

4. Check wiring between valve and controller.

5. Replace valve-apper.

1. Check condensate lines for obstructions.

2. Check oat switch in condensate reservoir.

3. Check wiring from condensate reservoir to 926 control and
repair as necessary.

The control must be reprogrammed. If programming does not
solve the problem, the control must be replaced.

Press RESET for at least 1 second to use the control.

1. Check outdoor sensor connections and wiring. Ensure the
sensor and wiring are intact and that the sensor is connected to
the boiler.

2. Check the outdoor sensor resistance with an ohmmeter. See
Table 25 for correct outdoor sensor resistance.

3. Replace the outdoor sensor.

Check the ue for obstructions and any sign of damage, especially
signs of excessive heat. Repair as necessary. Run the boiler and
check the ue temperature with an external thermometer. If
the ue temperature on the thermometer does not agree with
the ue temperature displayed in the status menu, inspect the
wiring to the ue temperature sensor in the boiler and repair as
necessary. If the wiring is intact replace the ue sensor. If the
ue temperature is excessive on the status menu and the test
thermometer reads the same, check and adjust combustion
controls on the boiler. If the problem persists, inspect the target
wall in the combustion chamber and replace it if cracked or
damaged.

1. Ensure boiler is properly programmed.

2. Check ue system for obstructions.

3. Check proper communication between boilers.

4. Check operation of apper valve.

5. Check wiring between valve and controller.

6. Replace valve-apper.

LP-428 Rev. 6.6.16

55

E19 indicates the line voltage frequency is

LINE VOLTAGE E19
PUMP OFF

Table 24 - Boiler Error and Fault Codes

out of range. This could happen if the boiler
is being powered from a small gasoline
powered generator that is overloaded or not
functioning correctly.

Part 12 - Maintenance

A. Procedures

Periodic maintenance should be performed once a year by a
qualied service technician to assure that all the equipment
is operating safely and eciently. The owner should make
necessary arrangements with a qualied heating contractor
for periodic maintenance of the boiler. The installer must also
inform the owner that a lack of proper care and maintenance
of the boiler may result in a hazardous condition.

BEFORE EACH HEATING SEASON a trained and qualied
service technician should perform the inspections as per the
boiler inspection and maintenance schedule in this manual.
Failure to do so could result in death or serious injury.
The combustion chamber insulation in this product contains
ceramic ber material. Ceramic bers can be converted
to cristobalite in very high temperature applications. The
International Agency for Research on Cancer (IARC) has
concluded, “Crystalline silica inhaled in the form of quartz
or cristobalite from occupational sources is carcinogenic to
humans (Group 1).”

• Avoid breathing dust and contact with skin and eyes.

• Use a NIOSH certied dust respirator (N95). This type

of respirator is based on the OSHA requirements for
cristobalite at the time this document was written. Other
types of respirators may be needed depending on job
site conditions. Current NIOSH recommendations can
be found on the NIOSH website: http://www.cdc.gov/
niosh/homepage.html. NIOSH approved respirators,
manufacturers, and phone numbers are also listed on
this website.

• Wear long-sleeved, loose tting clothing, gloves, and eye
protection.

• Apply enough water to the combustion chamber lining
to prevent dust.

• Wash potentially contaminated clothes separately from
other clothing. Rinse clothes washer thoroughly.

NIOSH stated First Aid.

• Eye: Irrigate immediately.

• Breathing: Fresh air.

B. Combustion Chamber Coil Cleaning Instructions

*Before beginning this procedure, have on hand the following
items:

• a nylon, stainless steel, or brass brush (not steel)

• gloves and eye protection

1. Shut down the boiler by using the following steps:
a. Close the gas valve. Shut down the unit, and wait for it to
be cool to the touch.
b. Disconnect the condensate piping from the outside
connection, (not from the boiler side), so ow from
condensate reservoir can be observed.

Inspect power wiring to the boiler and repair as necessary.
If connected to line voltage, notify the power company. If
connected to an alternate power source such as a generator or
inverter, make sure the line voltage frequency supplied by the
device is 60 Hz.

Supply Temperature Sensor

(7250P-324)

Outdoor Sensor

(7250P-319)

Outside

Temperature

o

F)

(

-22 171800 32 32550

-13 129800 41 25340

-4 98930 50 19870

5 76020 59 15700

14 58880 68 12490

23 45950 77 10000

32 36130 86 8059

41 28600 95 6535

50 22800 104 5330

59 18300 113 4372

68 14770 122 3605

77 12000 131 2989

86 9804 140 2490

95 8054 149 2084

104 6652 158 1753

113 5522 167 1481

Table 25 - Sensor Temperature Resistance

Resistance

(ohms)

High / Low

Temp Sensor

Temp. (oF)

Boiler Sensor

(7250P-667)

Indirect Sensor

(7350P-325)

Resistance (Ohms)

176 1256

185 1070

194 915

202 786

212 667

c. Disconnect electrical connections from the gas valve, spark
electrode, ame rectication probe, and combustion blower.
d. Remove the four (4) screws on the aluminum ¾” NPT
connector on the right side of the gas valve.
e. Disconnect the wiring connected to the combustion blower
motor.
f. Remove the six (6) 10MM nuts from the burner plate
assembly.
g. Pull the entire burner plate assembly with blower still
attached towards you, while removing or pushing aside any
wiring to allow removal of the assembly.

2. Spray the coils liberally with a spray bottle lled with clear
tap water. Conne the spray to the area being cleaned. Avoid
getting the ceramic target wall wet. If the condensate system is
blocked, use a vacuum to clear it.

3. Scrub coils of any buildup with a nylon, stainless steel, or brass
brush. Do not use a steel brush. Vacuum the debris from the
coils.

LP-428 Rev. 6.6.16

56

4. Spray the coils again with clear tap water. Conne the spray
to the area being cleaned. Flush the combustion chamber with
fresh water until it runs clear from the condensate reservoir. At
this point, the boiler should be ready to be reassembled.

a. Inspect gaskets.
b. Reinstall the burner assembly
c. Replace and tighten the six (6) 10MM nuts to the burner
plate using staggered tightening sequence. (See detail.)
d. Reconnect all wiring connections
e. Inspect the gas valve. Ensure the O-ring is in place.
f. Replace the four (4) screws on the aluminum connector on
the gas valve. Turn the gas back on. (IMPORTANT: CHECK
FOR GAS LEAKS!)
g. Turn boiler power back on and create a heat demand. When
boiler is lit observe condensate ow from the boiler. Be sure
the boiler is operating properly.
h. Reconnect the condensate piping to the outside condensate
connection.

Do not use solvents to clean any of the burner components.
The components could be damaged, resulting in unreliable or
unsafe boiler operation, substantial property damage, severe
personal injury, or death.

FDA approved for use in a potable water system.

3. Thoroughly ush the heat exchanger before commissioning
the unit back in service.

Figure 27 - Heat Exchanger Detail

C. Cleaning Water Side of Heat Exchanger

1. Make sure power is
turned o to the boiler.
Run water through the
hot water system to
ensure it is below room
temperature.

2. Close isolation valves
on the return and supply
connections to the
boilers as shown in the
piping diagrams in this
manual. Slowly open the
ball valves and release
pressure into a bucket.
Once pressure is released,
connect a hose to the
water line to ush the
boiler. Scale removing
solution may be used, but
must be approved for use
with stainless steel and

LP-428 Rev. 6.6.16

57

MODCON1000

MODCON1700

Figure 28 - MODCON1000 External Replacement Parts

Figure 29 - MODCON1700 External Replacement Parts

LP-428 Rev. 6.6.16

58

MODCON1000

Figure 30 - MODCON1000 Combustion System Replacement Parts

LP-428 Rev. 6.6.16

MODCON1700

59

Figure 31 - MODCON1700 Combustion System Replacement Parts

LP-428 Rev. 6.6.16

60

Figure 32 - Water Side Replacement Parts - All Models

LP-428 Rev. 6.6.16

61

Figure 33 - Cabinet Replacement Parts - All Models

LP-428 Rev. 6.6.16

62

Part 13 - Installation Checklist

Light O Activities Date Completed:

Check all piping and gas connections.
Verify all are tight.

1. Fill the Heating System

2. Check Gas Pipe

3. Check Combustion

4. Check Electrical
Connections

5. Verify System Operation
with Indirect Water Heater
Aquastat

6. Record Ionization
Current

7. Indirect Water Heater
Sensor

8. System Settings Verify system settings. CH Setpoint CH Dierential

9. Convert the Boiler
(MODCON1000 ONLY)

Notes:

Pressurize system. PSI

Add water to prime condensate cup.

Verify near boiler piping is properly
supported.

Leak test using locally approved methods
(consult jurisdictional code book).

Check incoming gas pressure (3.5 to 14”
WC).

Check the “drop” on light o (less than 1”
WC).

Check and adjust (if necessary) carbon
dioxide content.

Check and adjust (if necessary) carbon
monoxide content.

Ensure all electrical connections of line
voltage (pumps, etc.) and low voltage
circuits (system sensor, outdoor sensor,
etc.) are properly wired.

Turn up aquastat to verify wiring
connections. Boiler should re.

Check uA reading at d7 on the status
menu (see Start-Up section, this manual).

Verify safety and operation of the indirect
water heater. Record settings.

If necessary, convert the boiler to the
proper fuel type.

Locate the stickers in the appropriate
locations on the boiler.

Verify combustion settings after gas
conversion - Carbon Dioxide.

Verify combustion settings after gas
conversion - Carbon Monoxide.

Mail in conversion registration.

Static WC

Dynamic WC

%CO2 High Fire %CO2 Low Fire

ppm CO High Fire ppm CO Low Fire

uA High Fire uA Low Fire

DHW Setpoint DHW Dierential

%CO2 High Fire %CO2 Low Fire

ppm CO High Fire ppm CO Low Fire

Table 26 - Installation Checklist

Part 14 - Maintenance Report

In unusually dirty or dusty conditions, care must be taken to
keep boiler cabinet door in place at all times. Failure to do so
VOIDS the warranty.

Allowing the boiler to operate with a dirty combustion chamber
will hurt operation. Failure to clean the heat exchanger as
needed by the installation location could result in boiler failure,
property damage, personal injury, or death. Such product
failures ARE NOT covered under warranty.

LP-428 Rev. 6.6.16

The boiler requires minimal periodic maintenance under
normal conditions. However, in unusually dirty or dusty
conditions, periodic vacuuming of the cover to maintain
visibility of the display and indicators is recommended.
Periodic maintenance should be performed once a year by a
qualied service technician to assure that all the equipment
is operating safely and eciently. The owner should make
necessary arrangements with a qualied heating contractor
for periodic maintenance of the boiler. Installer must also
inform the owner that the lack of proper care and maintenance
of the boiler may result in a hazardous condition.

Inspection Activities Date Last Completed

Piping 1st Year 2nd Year 3rd Year 4th Year*

Near boiler piping

Vent

System 1st Year 2nd Year 3rd Year 4th Year*

Visual Do a full visual inspection of all system components.

Functional Test all functions of the system (Heat, Safeties).

Temperatures

Electrical

Connections Check wire connections. Make sure connections are tight.

Smoke and CO
Detector

Circuit Breakers Check to see that the circuit breaker is clearly labeled. Exercise circuit

Switch and Plug Verify ON/OFF switch and convenience plug are both functional.

Chamber / Burner 1st Year 2nd Year 3rd Year 4th Year*

Combustion
Chamber

Spark Electrode Clean. Set gap at 1/4” Clean probe with plumbers cloth to remove

Combination Ignitor
and Flame Probe

Condensate 1st Year 2nd Year 3rd Year 4th Year*

Neutralizer Clean out condensate neutralizer. Use wet/dry vacuum. Check for all

Condensate System Check entire condensate system to make sure there are no obstructions

Gas 1st Year 2nd Year 3rd Year 4th Year*

Pressure Measure incoming gas pressure (3.5 to 14” WC).

Pressure Drop Measure drop in pressure on light o (no more than 1” WC).

Check Gas Pipe for
Leaks

Combustion 1st Year 2nd Year 3rd Year 4th Year*

CO / CO2 Levels Check CO and CO2 levels in exhaust. See Start-Up Procedures for

Safeties 1st Year 2nd Year 3rd Year 4th Year*

ECO (Energy Cut
Out)

Sensors Check wiring. Verify through ohms reading.

Final Inspection 1st Year 2nd Year 3rd Year 4th Year*

Check List Verify that you have completed entire check list. WARNING: FAILURE

Homeowner Review what you have done with the homeowner.

Table 27 - *Continue annual maintenance beyond the 4th year as required.

Check boiler and system piping for any sign of leakage; make sure
pipes are properly supported.

Check condition of all vent pipes and joints. Ensure the vent piping
terminations are free of obstructions and blockages.

Verify safe settings on boiler or anti-scald valve.

Verify programmed temperature settings.

Verify devices are installed and working properly. Change batteries if
necessary.

breaker.

Check burner tube and combustion chamber coils. Clean according
to maintenance section of manual. Vacuum combustion chamber.
Replace any gaskets that show signs of damage.

oxides.

Check ionization in uA (d7 in Status Menu in Start-Up Procedures).
Record high re and low re. Clean probe with plumbers cloth to
remove oxides.

potential obstruction issues. Replenish marble chips or lime crystals if
needed (no smaller than ¾”). Rell system with water. WARNING: You
must verify ow of condensate and make sure the cap is connected
properly before leaving boiler unattended.

in ow. Make sure the condensate pump is working properly, verify all
connections.

Check gas piping. Test for leaks and signs of aging. Make sure all pipes
are properly supported.

ranges. Record at high and low re.

Check continuity on ue and water ECO. Replace if corroded.

TO DO SO COULD RESULT IN SERIOUS INJURY OR DEATH.

63

LP-428 Rev. 6.6.16

64

ANSI/UL 2034 listed and IAS certified.

ADDITIONAL INSTALLATION REQUIREMENTS

FOR THE COMMONWEALTH OF MASSACHUSETTS

In the Commonwealth of Massachusetts, the installer or service agent shall be a plumber or
gas fitter licensed by the Commonwealth.

When installed in the Commonwealth of Massachusetts or where applicable state codes
may apply; the unit shall be installed with a CO detector per the requirements listed below.

5.08: Modifications to NFPA-54, Chapter 10

(1) Revise NFPA-54 section 10.5.4.2 by adding a second exception as follows:

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

(2) Revise 10.8.3 by adding the following additional requirements:

(a) For all side wall horizontally vented gas fueled equipment installed in every dwelling,
building or structure used in whole or in part for residential purposes, including those owned
or operated by the Commonwealth and where the side wall exhaust vent termination is less
than seven (7) feet above finished grade in the area of the venting, including but not limited
to decks and porches, the following requirements shall be satisfied:

1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side
wall horizontal vented gas fueled equipment, the installing plumber or gasfitter shall observe
that a hard wired carbon monoxide detector with an alarm and battery back-up is installed
on the floor level where the gas equipment is to be installed. In addition, the installing
plumber or gasfitter shall observe that a battery operated or hard wired carbon monoxide
detector with an alarm is installed on each additional level of the dwelling, building or
structure served by the side wall horizontal vented gas fueled equipment. It shall be the
responsibility of the property owner to secure the service of qualified licensed professionals
for the installation of hard wired carbon monoxide detectors

a. In the event that the side wall horizontally vented gas fueled equipment is installed
in a crawl space or an attic, the hard wired carbon monoxide detector with alarm
and battery back-up may be installed on the next adjacent floor level.

b. In the event that the requirements of this subdivision cannot be met at the time of
completion of installation, the owner shall have a period of thirty (30) days to comply
with the above requirements; provided, however, that during said thirty (30) day
period, a battery operated carbon monoxide detector with an alarm shall be
installed.

2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as
required in accordance with the above provisions shall comply with NFPA 720 and be

LP-172

LP-428 Rev. 6.6.16

REV. 02/16/06

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

4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas
fueled equipment shall not approve the installation unless, upon inspection, the inspector
observes carbon monoxide detectors and signage installed in accordance with the
provisions of 248 CMR 5.08 (2)(a) 1 through 4.

(b) EXEMPTIONS: the following equipment is exempt from 248 CMR 5.08 (2)(a) 1 through 4:

1. The equipment listed in Chapter 10 entitled “Equipment Not Required to be
Vented” in the most current edition of NFPA 54 as adopted by the Board; and

2. Product Approved side wall horizontally vented gas fueled equipment installed in a
room or structure separate from the dwelling, building or structure used in whole or in
part for residential purposes.

65

(c) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT VENTING SYSTEM PROVIDED. When
the manufacturer of Product Approved side wall horizontally vented gas equipment
provides a venting system design or venting system components with the equipment, the
instructions provided by the manufacturer for installation of the equipment and the venting
system shall include:

1. Detailed instructions for the installation of the venting system design or the venting
system components; and

2. A complete parts list for the venting system design or venting system.

(d) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED.
When the manufacturer of a Product Approved side wall horizontally vented gas fueled
equipment does not provide the parts for venting the flue gases, but identifies “special
venting systems”, the following requirements shall be satisfied by the manufacturer:

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

2. The “special venting systems” shall be Product Approved by the Board, and the
instructions for that system shall include a parts list and detailed installation instructions.

(e) A copy of all installation instructions for all Product Approval side wall horizontally vented
gas fueled equipment, all venting instructions, all parts lists for venting instructions, and/or all
venting design instructions shall remain with the appliance or equipment at the completion
of the installation.

LP-172

REV. 02/16/06

LP-428 Rev. 6.6.16

66

MODCON Boiler

Limited Warranty

Ten year warranty to assure your complete satisfaction.

HTP warrants each MODCON boiler to be free from defects in
material and workmanship according to the following terms,
conditions, and time periods. UNLESS OTHERWISE NOTED THESE

WARRANTIES COMMENCE ON THE DATE OF INSTALLATION.

COVERAGE

A. During the first year after the date of installation, HTP warrants
that it will repair or replace, at its option, any defective or
malfunctioning component of the boiler that is found to have failed
due to manufacturer’s defect. Replacement parts will be warranted
for ninety (90) days.
B. During the first through fifth year after the date of installation,
HTP warrants that it will repair or replace, at its option, any
defective boiler heat exchanger that is found to have failed due
to manufacturer’s defect. No other component of the boiler will be
replaced during this period (with exception to the blower motor,
which will have a limited warranty of three [3] years).
C. During the sixth through tenth year after the date of installation,
HTP will repair or replace, at its option, any defective boiler heat
exchanger found to have failed due to leaking at a cost to the
purchaser equal to the following percentages of the manufacturer’s
list price in effect at the date of replacement:

Year of Claim 6 7 8 9 10

Percentage to be Paid

by Purchaser

No other component of the boiler will be replaced during this period.
D. Should a defect or malfunction result in a leakage of water
within the above-stated warranty periods due to defective material
or workmanship, malfunction, or failure to comply with the above
warranty, such as defects or malfunctioning having been verified
by an authorized HTP representative, then HTP will replace the
defective or malfunctioning boiler with a replacement boiler of the
nearest comparable model available at the time of replacement.
The replacement boiler will be warranted for the unexpired portion
of the applicable warranty period of the original boiler.
E. If government regulations, industry certification, or similar
standards require the replacement boiler or part(s) to have features
not found in the defective boiler or part(s), you will be charged
the difference in price represented by those required features. If
you pay the price difference for those required features and/or
to upgrade the size and/or other features available on a new
replacement boiler or part(s), you will also receive a complete new
limited warranty for that replacement boiler or part(s).
F. In the event of a leakage of water of a replacement boiler due to
defective material or workmanship, malfunction, or failure to comply
with the above warranty, HTP reserves the right to refund to the
original purchaser the published wholesale price available at the
date of manufacture of the original boiler.
G. If at the time of a request for service the purchaser cannot
provide a copy of the original sales receipt or the warranty card
registration, the warranty period for the boiler shall then be deemed
to have commenced thirty (30) days after the date of manufacture
of the boiler and NOT the date of installation of the boiler.
H. This warranty extends only to boilers utilized in closed loop
heating applications that have been properly installed based upon
the manufacturer’s installation instructions. The use of the boiler as
a potable water-heating appliance shall void any coverage under
this warranty.
I. It is expressly agreed between HTP and the original consumer

25 % 50 % 75% 80 % 90 %

purchaser that repair, replacement, or refund are the exclusive
remedies of the original consumer purchaser.

OWNER’S RESPONSIBILITIES

To avoid the exclusion list in this warranty, the owner or installer
must:

1. Maintain the boiler in accordance with the maintenance procedure
listed in the manufacturer’s provided instructions. Preventive
maintenance can help avoid any unnecessary breakdown of the
boiler and keep it running at optimum efficiency.

2. Maintain all related heating components in good operating
condition.

3. Check all condensate lines to confirm that all condensate drains
properly from the boiler.

4. Use the boiler in a closed system with a properly sized and
installed thermal expansion tank.

5. Make provisions so if the boiler or any component part thereto
should leak, the resulting flow of water will not cause damage to
the area in which it is installed.

6. Operate the boiler at water pressures not exceeding the working
pressure shown on the rating plate.

WARRANTY EXCLUSIONS

This limited warranty will not cover:

1. All labor charges incurred by any person in connection with the
examination or replacement of parts claimed by the purchaser to
be defective.

2. Any failed components of the heat system not manufactured by
HTP as part of the boiler.

3. Boilers repaired or altered without the prior written approval of
HTP.

4. Damages, malfunctions, or failures caused by improper
maintenance, misuse, abuse, accident, fire, flood, freeze, lightning,
acts of God and the like.

5. Any boiler not installed by a qualified heating installer/service
technician.

6. Damages, malfunctions, or failures resulting from improper
installation, failure to operate and maintain the boiler in accordance
with the manufacturer’s provided instructions, or failure to install the
boiler in accordance with applicable building codes/ordinances, or
good plumbing and electrical trade practices.

7. Any damage or failure of the boiler heat exchanger due to the
accumulation of solid materials and lime deposits.

8. Any damage or failure caused by operating the boiler in a
corrosive or contaminated atmosphere, including, but not limited
to, sheetrock particles, plasterboard particles, dirt, or dust being
introduced into the boiler or its components including, but not
limited to, the outside tubes of the heat exchanger.

9. Damages, malfunctions, or failures resulting from improper
installation, failure to operate the boiler at pressures not exceeding
the working pressure shown on the rating plate, or failure to maintain
and operate the boiler in accordance with the printed instructions
that accompany the unit.

10. Failure to operate the boiler in a closed system with a properly
sized expansion tank.

11. Any damage or failure resulting from improper water chemistry.
WATER CHEMISTRY REQUIREMENTS – Sodium less than
20mGL. Water pH between 6.0 and 8.0. Hardness less than 7
grains. Chlorine concentration less than 100 ppm.

12. Any damages, malfunctions, or failures resulting from the use
of dielectric unions.

13. Components of the boiler that are not defective, but must be
replaced during the warranty period as a result of reasonable wear
and tear.

14. Components of the boiler subject to warranties, if any, given by
their manufacturers. HTP does not adopt these warranties.

LP-428 Rev. 6.6.16

67

15. Service trips to teach you how to install, use, maintain, or to

bring the boiler installation into compliance with local building codes
and regulations.

16. Any boiler purchased from an unauthorized dealer or online

retailer.

17. Failure to locate the boiler in an area where leakage of the

water line connections or the combination temperature and relief
valve will not result in damage to the area adjacent to the boiler or
lower floors of the structure.

18. Failure or performance problems caused by improper sizing of

the boiler, piping, expansion device, gas supply line, the venting
connection, combustion air openings, electric service voltage,
wiring, or fusing.

19. Damages, malfunctions, or failures caused by improper

conversion from natural gas to LP gas or LP gas to natural gas.

20. Damages, malfunctions, or failures caused by operating the

boiler with modified, altered, or unapproved parts.

21. Damages, malfunctions, or failures caused by subjecting the

heat exchanger to pressures or firing rates greater than those
shown on the rating label.

22. Damages, malfunctions, or failures resulting from the use of

any attachment(s) not supplied by HTP.

23. Units installed outside the fifty states (and the District of

Columbia) of the United States of America and Canada.

PROCEDURES FOR WARRANTY SERVICE REQUESTS

At the time a claim is filed, the purchaser must present a copy of the
original sales receipt. Contact the retailer from whom the boiler was
purchased for assistance. All alleged defective or malfunctioning
parts must be returned to HTP via the local distribution channels
where original purchase was made. NOTE: Any parts or heaters
returned to HTP for warranty analysis will become the property of
HTP and will not be returned, even if credit is denied. If all warranty
conditions are satisfied, HTP will provide replacement parts to the
retailer.
If you have questions about the coverage of this warranty, please
contact HTP at the address or phone number stated below:

OR DAMAGES ALLEGED TO HAVE BEEN CAUSED BY ANY
FAILURE OF HTP TO MEET ANY OBLIGATION UNDER THIS
AGREEMENT INCLUDING THE OBLIGATION TO REPAIR AND
REPLACE SET FORTH ABOVE. NO AGREEMENT VARYING OR
EXTENDING THE FOREGOING WARRANTIES, REMEDIES OR
THIS LIMITATION WILL BE BINDING UPON HTP. UNLESS IN
WRITING AND SIGNED BY A DULY AUTHORIZED OFFICER
OF HTP. THE WARRANTIES STATED HEREIN ARE NOT
TRANSFERABLE AND SHALL BE FOR THE BENEFIT OF THE
ORIGINAL PURCHASER OF A MODCON BOILER ONLY.

NO OTHER WARRANTIES

Your HTP warranty gives you specific legal rights, and you may
also have other rights that vary from state to state. Some states do
not allow the exclusion or limitation of incidental or consequential
damages so this limitation or exclusion may not apply to you.
These are the only written warranties applicable to the MODCON
boiler manufactured and sold by HTP. HTP neither assumes nor
authorizes anyone to assume for it any other obligation or liability
in connection with said MODCON boilers.
HTP reserves the right to change specifications or discontinue
models without notice.

HTP

272 Duchaine Blvd.

New Bedford, MA. 02745

Attention: Warranty Service Department

[phone]

SERVICE, LABOR AND SHIPPING COSTS

This warranty does not extend to shipping charges, delivery
expenses, or administrative fees incurred by the purchaser in
repairing or replacing the MODCON boiler. This warranty does
not extend to labor costs beyond the coverage specified in this
warranty document.

LIMITATIONS OF YOUR HTP WARRANTY AND REMEDIES
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND
ARE GIVEN AND ACCEPTED IN LIEU OF ANY AND ALL
OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE AND ANY OBLIGATION, LIABILITY, RIGHT, CLAIM
OR REMEDY IN CONTRACT OR TORT, WHETHER OR NOT
ARISING FROM HTP’S NEGLIGENCE, ACTUAL OR IMPUTED.
THE REMEDIES OF THE PURCHASER SHALL BE LIMITED
TO THOSE PROVIDED HEREIN TO THE EXCLUSION OF
ANY OTHER REMEDIES INCLUDING WITHOUT LIMITATION,
INCIDENTAL OR CONSEQUENTIAL DAMAGES, SAID
INCIDENTAL AND CONSEQUENTIAL DAMAGES INCLUDING,
BUT NOT LIMITED TO, PROPERTY DAMAGE, LOST PROFIT

LP-428 Rev. 6.6.16

68

Maintenance Notes

LP-428 Rev. 6.6.16

Customer Installation Record Form

The following form should be completed by the installer for you to keep as a record of the installation in case of a warranty
claim. After reading the important notes at the bottom of the page, please also sign this document.

Customer’s Name

Date of Installation

Installation Address

Product Name / Serial Number(s)

Comments

69

Installer’s Code / Name

Installers Phone Number

Signed by Installer

Signed by Customer

Installation Notes

IMPORTANT

Customer: Please only sign after the installer has fully reviewed the installation, safety, proper operation, and maintenance of the system.
If the system has any problems please call the installer. If you are unable to make contact, please call your sales representative.
Distributor / Dealer: Please insert contact details.

LP-428 Rev. 6.6.16