LP-446-r4 Rev. 10.12.16
8
C. Optional Equipment
Optional equipment available from HTP (and Part #):
•
Indirect Tank Sensor (7250P-325)
•
4” Stainless Steel Vent Termination Kit (V2000)
•
6” Stainless Steel Vent Termination Kit (V3000)
•
High and Low Gas Pressure Switch Kit with Manual
Reset (7350P-600)
•
UL 353 Compliant Low Water Cut-Off Interface Kit with
Manual Reset (7350P-601)
•
Alarm System (to monitor any failure) (7350P-602)
•
PC Connection Kit (7250P-320)
•
Condensate Neutralizer (7350P-611)
•
Caster Kit (7350p-604)
•
Glass-Lined Storage Tanks (GL-119, GL-175)
•
Stainless Steel Storage Tank (SSU-119CB)
Remove all sides of the shipping crate of the boiler.
Components included with the boiler:
•
Temperature and Pressure Gauge
•
Pressure Relief Valve
•
Three (3) Stainless Steel Screens
•
Supply and Return Thermistors
•
Wiring Harness
•
Flow Switch and Fitting
•
System/Pipe 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
VWH® condensing technology intelligently delivers large
amounts of hot water while maximizing efficiency. Outlined
below are the features of the system and how they operate:
Stainless Steel Heat Exchanger
The highly efficient stainless steel heat exchanger is designed to
use the cold water return from the storage tank and extract the
last bit of heat before it is exhausted.
Modulating Combustion System
The combustion system modulates the output of the burner
during operation to match system demand and achieve the
control set point while in operation. The set point can change by
internal or external signals to enhance the overall performance
of the system.
Control
The integrated control system monitors the system and
regulates fan speed to control boiler output. This allows the
boiler to deliver only the amount of heat energy required and
nothing more.
The 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 efficiency.
The cascade system works by establishing one boiler as the
master and the other connected boilers as followers. The
master boiler requires a sensor to provide feedback on set point
temperature in order to adjust heating input from the connected
boilers. Each cascaded boiler will have its own pump to provide
maximum flow and control heat exchanger flow rate.
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 flow only if
powered and combustion air is flowing.
Integrated Venturi (500 Models) or Swirl Plate (700/850
Models)
Controls air and gas flow into the burner.
Burner
The high grade stainless steel burner uses premixed air and gas
to provide a wide range of firing rates.
Spark Ignition
The burner is ignited by applying high voltage through the
system spark electrode. The spark from the electrode ignites
mixed gas off of the burner.
Supply Water Temperature Sensor
This sensor monitors the boiler outlet water temperature
(System Supply). The control adjusts boiler firing rate so the
supply temperature will match the boiler set point.
Return Water Temperature Sensor
This sensor monitors boiler return water temperature (System
Return).
Temperature and Pressure Gauge
Allows the user to monitor system temperature and pressure.
Electrical field 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 efficiency appliance and will produce
condensate. The condensate collection system has a float
switch which monitors condensate level and prevents
condensate from backing up into the combustion system.
Inside the collection system is a built in trap which seals
the combustion system from the connected drain. This
condensate should be neutralized to avoid damage to the
drainage system or piping.
Flow Protection
The supplied flow switch is designed to protect the boiler
during low flow conditions. The boiler control also monitors
flow through the heat exchanger by monitoring the return
and supply sensors and will shut down the burner before
overheating occurs.
System Pipe Sensor
This sensor is designed to be used in a cascade system. When
placed on the supply line feeding the storage tank, the system
pipe sensor measures the temperature of return water and
communicates with the control system to modulate the firing
rate of the connected boilers.
NOTE:
When using a system sensor, pipe insulation must be
wrapped around it to improve temperature measurement
accuracy and increase overall system efficiency.
0-10 Volt Input
Allows the installer to connect a BMS (Building Management
System) to control the boiler.
Indirect Tank Sensor (optional)
Monitors storage tank temperature.
Summary of Contents for MODCON500
Page 35: ...LP 446 r4 Rev 10 12 16 35 Figure 29 Cascade Master and FollowerWiring...
Page 57: ...LP 446 r4 Rev 10 12 16 57 Figure 35 500 Model Combustion System Replacement Parts...
Page 58: ...LP 446 r4 Rev 10 12 16 58 Figure 36 700 850 Models Combustion System Replacement Parts...
Page 60: ...LP 446 r4 Rev 10 12 16 60 Figure 38 Cabinet Replacement Parts All Models...
