LP-428 Rev. 6.6.16
7
each operates.
Stainless Steel Heat Exchanger
The highly ecient 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
eciency. 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 eciency.
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.
NOTE: When using a system sensor, pipe insulation must be
wrapped around it to improve temperature measurement
accuracy and increase overall system eciency.
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 eciency 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 eciency.
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
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