HTP PHE199-119 - Manual (Page 8)

8
LP-314 REV. 3.24.14
High Efficiency Heat Exchanger
The highly efficient 90/10 copper nickel heat exchanger provides direct energy transfer from the combustion gases into domestic water.
Hot gases travel from the primary circuit to heat the combustion walls, which then transfer heat directly into the water. The secondary
circuit then transfers the last bit of energy to the bottom of the tank, where the hot gases are converted to water vapor, giving the
appliance a combustion efficiency of 98% and thermal efficiency of up to 96%.
Modulating Combustion System
The modulating combustion system is designed to regulate firing rate
based on heat demand. Total System Control monitors tank
operation, system parameters, and controls the firing rate of the
burner, providing only the energy required to satisfy both the domestic
hot water and central heating needs.
Total System Control
Total System Control automatically manages the needs of both the
central heating and domestic hot water systems through the use of
sensors. These sensors monitor inputs (such as outdoor temperature,
tank temperature, and heating module outlet temperature) providing
data that allows accurate control of the entire system. You may
choose to use the
control’s factory default settings or reprogram the
system parameters to provide design flexibility.
Hydronic Heating Module
The hydronic heating module connects to the storage tank through
two dip tubes. The first dip tube draws heated water from the top of
the storage tank and circulates it through a brazed plate heat
exchanger that transfers the
water’s stored energy to the hydronic
side of the plate. Once the energy is transferred, the water returns
through the second dip tube to a lower section of the storage tank to continue circulating. A stainless steel circulator pump modulates
output, varying flow through the brazed plate heat exchanger to meet domestic hot water and central heating demand. An outlet sensor
provides feedback to the control to assure accurate temperature control.
Venting System
This appliance vents in plastic pipe. Use only the approved venting material outlined in the venting section (Part 8) of this manual. Vent
size can vary from 2” to 3” depending on the appliance input rate. The venting system requires an exhaust vent and intake pipe. Special
attention should be taken when selecting vent location. Vents can run horizontally or vertically, depending on system design. Support
the vents as shown in Venting, Part 8.
Burner
The burner is constructed of high grade stainless steel and uses pre-mixed air and gas to provide 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. Appliance condensate is similar to that of an automobile when it is initially started.
It is very important that the condensate line slopes away from the appliance, down to a suitable drain. If the condensate outlet is lower
than the drain, you must use a condensate removal pump (kit p/n 554200, available from HTP).
A condensate filter, if required by local authorities, will neutralize the condensate, and can be made up of lime crystals, marble or
phosphate chips. This filter can be purchased from HTP (p/n 7450P-212) and installed in the field.
It is also very important that the condensate line not be exposed to freezing temperatures or any other type of blockage. Plastic pipe
must be the only material used for condensate line. Steel, brass, copper, or other materials will be subject to corrosion or deterioration.
In a long, horizontal condensate line, a second vent may be necessary to prevent vacuum lock. Also, an increase in pipe size and
support of the condensation line may be necessary to allow condensate to drain properly.
Spark Ignition
The burner flame is ignited by applying high voltage to the system spark electrode. This causes a spark from electrode to ground.
Outdoor Sensor
The outdoor sensor monitors outdoor temperature and adjusts the set point to provide greater efficiency.