HTP ELP-199 - Manual (Page 10)

10
LP-294 REV. 2.20.14

CSD-1 Form

H-3 Data Sheet
B. HOW BOILER OPERATES
Elite Plus
®
condensing technology intelligently delivers highly efficient hydronic heating by adjusting for altitude and fuel (liquid propane
or natural gas) without the need for conversion or physical adjustment. 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 extract all available heat from the
supply line before it is exhausted.
Modulating Combustion System - The combustion system will modulate 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 which enhance
the overall performance of the system.
Control
– The integrated control system monitors the system and regulates mass flow to control boiler output. This allows the boiler to
deliver the amount of heat energy required and nothing more.
The control can be set to monitor outdoor temperature through an outdoor sensor to regulate boiler set point. The system can be further
enhanced by installing an indirect water heater to provide domestic hot water.
The control can regulate the output of up to sixteen boilers through its cascade system function. The cascade system controls up
multiple boilers in such a way that they function as one system. This allows for greater turn down ratios, minimizing downtime and
maximizing efficiency.
The cascade system establishes one boiler as the master and the connected boilers as followers. The master requires a sensor
providing set point temperature feedback 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 installer to change system parameters and monitor
outputs.
Start Up
– Learning Behavior – When the boiler is first powered on, it may have some unsuccessful starts. This happens because the
boiler control is learning about the system through its sensors.
Integrated Air Mass Flow Sensor and Modulating Gas Valve
– An air mass flow sensor is integrated into the boiler fan. When the
fan receives a demand from the control, it engages and automatically adjusts for external influences like air density or system pressure
drop.
Burner
– Constructed of high grade stainless steel, the burner provides a wide range of firing rates using premixed air and gas fuel.
Heat Load Limit Management
– The heat load will automatically adapt during operation because of circumstances like wind, chimney
draft, low ionization current, etc. In the same way, the maximum heat load will adapt to too high counter pressure in the exhaust gas
pipe or if the gas pressure is too low.
Post Heating and Backflow Prevention in Standby Mode
– To prevent overheating, the fan will run at minimum mass flow when the
burner is too hot. If the boiler is not running and backflow is detected, the fan will run at minimum mass flow for up to 5 hours after heat
demand.
Step Modulation
– On receiving a Central Heating demand, the boiler will start at minimum output and gradually increase by steps to
provide precise output for even small heating systems.
Spark Ignition
– The burner is ignited by applying high voltage through the system spark electrode. This spark ignites mixed gas off of
the burner.
Flame Sensing
– When the burner is lit, an ionization probe senses the flame.
Supply Water Temperature Sensor
– This sensor monitors boiler outlet water temperature (System Supply). The control adjusts the
boiler firing rate so the supply temperature will match the set point.
Return Water Temperature Sensor
– Monitors boiler return water temperature (System Return).
Flue Sensor
– Monitors flue temperature and protects the exhaust gas PVC piping.
Temperature and Pressure Gauge
– Allows the user to monitor system temperature and pressure.