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PART 2 – HOW THE HEATER OPERATES
Modulation Condensing Technology is an intelligent system that delivers highly efficient water heating,
while maximizing efficiency by measuring the data parameters of your water heating system. Some of its
features are:
Stainless Steel Water Storage Tank
The stainless steel water storage tank has a combustion chamber submerged into the tank water. When
the water heater is fired, combustion gases heat the combustion chamber walls, transferring heat directly
into the surrounding water. These hot gases are blown into secondary heat exchanger coils, where more
heat is transferred into the water, removing even more heat from the gases.
Modulating Combustion System
Modulation during water heating operation is based on tank temperature. The control monitors the system
to regulate burner output during operation to match system demand. This increase in efficiency allows for
substantial fuel savings.
Gas Valve
The gas valve senses suction from the blower, allowing gas to flow only if the gas valve is energized and
combustion air is flowing.
Upper Supply Tank Sensor
This sensor monitors the upper portion water temperature (system supply) of the water heater. The
control module adjusts the burner firing rate so the outlet water temperature meets the set point.
Lower Return Tank Sensor
This sensor monitors the lower portion of the water heater inlet water temperature (system return). The
control module reduces or increases input, depending on how close the water temperature is to the outlet
water temperature set point.
Control
The integrated control system monitors upper and lower water temperature and regulates fan speed to
regulate the unit’s energy output. This allows the unit to deliver the required amount of heated energy and
nothing more.
Burner
Constructed of high grade stainless steel, the burner uses pre-mixed air and gas and provides a wide
range of firing rates.
Condensate Drain Connection
This is a condensing high efficiency appliance, and therefore has a condensate removal system.
Condensate is nothing more than water vapor, derived from combustion products and similar to an
automobile when it is initially started. It is very important that the condensate line slopes away from the
water heater and down to a suitable inside drain.
If the condensate outlet on the heater is lower than the drain, you must use a condensate removal pump
(kit p/n 554200 available from HTP.) In addition, local authorities may require a condensate neutralizer to
neutralize the condensate. Condensate neutralizers are made up of lime crystals, marble or phosphate
chips. Neutralizers can be installed in the field by the installer and purchased from HTP (p/n 7450P-212).
It is also very important not to expose the condensate line to freezing temperatures or any type of
blockage. Plastic tubing must be the only material used for the condensate line. Steel, brass, copper or
other materials will be subject to corrosion or deterioration. A second vent may be necessary to prevent
condensate line vacuum lock on a long horizontal run. Also, an increase in pipe size may be necessary to
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