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 100
o
F / 37
o
C 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.
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
To avoid electric shock, disconnect electrical supply before
performing maintenance.
NOTE: When inquiring about service or troubleshooting,
reference the model and serial numbers from the boiler rating
label.
To avoid severe burns, allow boiler and associated equipment to
cool before servicing.
Be sure to disconnect electrical power before opening boiler
cabinet or performing service. Failure to do so could result in
electrical shock, property damage, serious personal injury, or
death.
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.
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-eciency heat exchanger
can be damaged by build-up or corrosion due to
sediment. HTP recommends a suction strainer in this
type of system.
• Do not use petroleum-based cleaning or sealing
compounds in boiler system. Gaskets and seals in
the system may be damaged, possibly resulting in
substantial property damage.
• Do not use “homemade cures” or “boiler patent
medicines”. Substantial property damage, damage to
boiler, and/or serious personal injury may result.
• Continual fresh make-up water will reduce boiler life.
Mineral buildup in the heat exchanger reduces heat
transfer, overheats the stainless steel heat exchanger,
and causes failure. Addition of oxygen from make-
up water can cause internal corrosion in system
components. Leaks in the boiler or piping must be
repaired at once.
• 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.
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.
Failure of the boiler due to freeze related damage IS NOT
covered by product warranty.
E. Freeze Protection
NOTE: Consider piping and installation when determining
boiler location.
Part 2 - Before You Start
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
A. What’s in the Box
B. How the Boiler Operates
Mod Con boilers are designed to meet the needs of the most
challenging new and retrot 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
eciency. Outlined below are features of the system and how
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.
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