Westinghouse WBCETNG1000, Руководство пользователя, Страница: 7 / 74

WHL-038 Rev. 1.29.16
7
Stainless Steel / Steel Heat Exchanger
The highly efficient heat exchanger is designed to use the cold
water return from the system and extract the last bit of heat
before it is exhausted.
Modulating Combustion System
The combustion system modulates the output of the burner
during operation to match system demand and achieve
the control set point while in operation. The set point can
change by internal or external signals to enhance the overall
performance of the system.
Control
The integrated control system monitors the system and
regulates fan speed to control boiler output. This allows the
boiler to deliver only the amount of heat energy required
and nothing more. The system can be further enhanced by
installing an indirect water heater to provide domestic hot
water.
The control can regulate the output of multiple boilers
through its cascade system function. The cascade system is
capable of connecting up to eight boilers together in such a
way that they function as one boiler system. This allows for
greater turn down ratios and provides systematic control of
the multiple boilers in an installation to minimize downtime
and maximize efficiency.
The cascade system works by establishing one boiler as the
master and the other connected boilers as followers. The
master boiler requires a cascade system sensor and a cascade
pump in addition to its own boiler pump. Each of the follower
boilers will have its own pump to provide maximum flow and
control heat exchanger flow rate.
System Display and Operational LED Light Indicators
The display allows the user to change system parameters and
monitor system outputs.
Gas Valve
Senses suction from the blower, allowing gas to flow only if
powered and combustion air is flowing.
Integrated Venturi
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.
Burner Sensor
Continually monitors the temperature of the burner to provide
increased safety. Temperatures outside the allowable range
will shut down the boiler before an unsafe condition occurs.
Spark Ignition
The burner is ignited by applying high voltage through the
system spark electrode. The spark from the electrode ignites
mixed gas off of the burner.
Dual Supply Water Temperature Sensor / High Limit Water
ECO
This dual sensor monitors the boiler outlet water temperature
(System Supply). The control adjusts boiler firing rate so
the supply temperature will match the boiler set point. The
dual sensor meets all requirements to function as a safety,
eliminating the mechanical ECO and increasing safety and
reliability.
Return Water Temperature Sensor
This sensor monitors boiler return water temperature (System
Return).
Temperature and Pressure Gauge
Allows the user to monitor system temperature and pressure.
Electrical 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.
Supplied Condensate Collection System (Field Installed)
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 optional 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.
Outdoor Sensor
The control adjusts unit set point based on the outdoor
temperature measured by this sensor to provide greater
efficiency.
0-10 Volt Input
Allows the installer to connect a BMS (Building Management
System) to control the boiler.
0-10 Volt Output A (Configured through Control System)
0-10 Volt Output A is configured through the boiler’s control
system. 0-10 Volt Output A is related to one of the following
boiler values: boiler power, cascade power, fan speed, alarm
status, or temperature setting based on outdoor reset curve.
UL 353 Internal Low Water Cutoff (LWCO)
The supplied internal Low Water Cutoff meets UL 353
requirements to function as a safety, locking out the boiler when
water level is inadequate for safe operation.
Boost Timer Function
This function temporarily overrides the outdoor reset curve in
order to satisfy a thermostat setpoint in a short amount of time,
especially during a relatively warm day.
Flue Temperature Modulation
As an additional safety feature, if the flue temperature exceeds
200
o
F, the control will modulate the boiler down based on the
vent temperature, rather than the supply temperature. If the
flue temperature exceeds 210
o
F the control will lock out the
boiler.
System Sensor (Optional)
This sensor is designed to be used in a cascade system. The
system pipe sensor measures the temperature of return water
and communicates with the control system to modulate the
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.
External UL 353 Low Water Cutoff (Optional)
Connection points are provided on the Field Connection Board
to install an external LWCO if required by local codes.
Indirect Tank Sensor (Optional)
Monitors storage tank temperature.