LP-325 Rev. 009 Rel. 004 Date 12.2.20
8
Part 2 - Before You Start
B. How the Appliance Operates
Condensing Technology maximizes efficiency by measuring the needs
of your heating system through the use of sensors and a control unit.
The appliance uses data gathered by these sensors to intelligently
deliver highly efficient hydronic heating.
Heat Exchanger
Exhaust gas flows through the primary section of the highly efficient
combustion heat exchanger into the secondary heat exchanger
section, where the coldest water on the bottom of the tank extracts
the last residual amount of heat energy from the gas.
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.
Gas Valve
The gas valve senses suction from the blower, allowing gas to flow only
if combustion air is flowing.
Swirl Plate System
The swirl plate on the gas valve controls air and gas flow into the
burner, assuring better mixing for improved combustion.
Combination Top High Temperature Sensor
The control module adjusts appliance firing rate based on the supply
temperature monitored by this sensor.
Bottom Water Temperature Sensor
The control module reduces or increases appliance input according to
the return water temperature measured by this sensor.
Temperature and Pressure Gauge
Allows the user to monitor system temperature and pressure.
Control
The integrated control system monitors return and supply water
temperature and regulates the unit’s BTU output by controlling fan
speed, delivering only the amount of heated energy required.
Burner
The metal fiber and high grade stainless steel burner uses pre-mixed
air and gas to provide a wide range of firing rates.
Electrical Field Connections with Terminal Strips
The cabinet allows easy access to the clearly marked line voltage and
low voltage terminal strips to facilitate wiring to the appliance.
Condensate Drain Connection
This is a condensing high efficiency appliance with a condensate
removal system. Condensate is nothing more than water vapor derived
from combustion products, similar to that of an automobile when it
is initially started. It is very important that the condensate line slopes
away from the appliance and down to a suitable inside drain.
Components included with the appliance:
• Intake PVC Tee with Screens
• Exhaust PVC Coupling with Screens
• 30 PSI Temperature and Pressure Relief Valve
• Installation Manual and Warranty
• User’s Information Manual
• Pressure and Temperature Gauge
• Outdoor Sensor (Part # 7250P-319)
A. What’s in the Box
Remove the appliance and accessories from the shipping crate. Take
care to place the appliance and accessories in a safe location prior to
installation to prevent damage to the mechanical connections.
To control the temperature of low temperature heating circuits
when using an indirect fired water appliance, a thermostatic
mixing valve is required. Failure to install a thermostatic mixing
valve could result in property damage, severe personal injury, or
death.
The indirect sensor allows the installer to operate the appliance
to satisfy two temperatures: one for central heating and the other
for a domestic hot water heater. This allows the user to increase
water temperature supplied to the appliance to recover faster by
prioritizing flow at a higher rate than may be needed for central
heating.
NOTE:
This application requires two separate circulators.
C. Optional Equipment
Optional equipment available from HTP (and Part #):
• 3” Stainless Steel Vent Termination Kit (V1000)
• 4” Stainless Steel Vent Termination Kit (V2000)
• 2” PVC Concentric Vent Kit (KGAVT0501CVT)
• 3” PVC Concentric Vent Kit (KGAVT0601CVT)
• 3” Polypro Vent Kit (8400P-001)
• 3” Polypro Pipe
(33’ length # 8400P-002, 49.5’ length # 8400P-003)
• System Sensor (7250P-324)
• Indirect Tank Sensor (7250P-325)
• Alarm System (7350P-602) to monitor any failure
• Outdoor Sensor (7250P-319)
• PC Connection Kit (7250P-320)
• Condensate Neutralizer (7450P-212)
• UL 353 Compliant Low Water Cut-Off Interface Kit with
Manual Reset (7350P-601)
NOTE:
When using an optional system sensor, pipe insulation
must be wrapped around it to improve temperature measurement
accuracy and increase overall system efficiency.
If the appliance condensate outlet is lower than the drain, use a
condensate removal pump (Part # 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 (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
allow condensate to drain properly. Support of the condensate line
may be necessary to avoid blockage of the condensate flow.
Spark Ignition
The burner flame ignites by applying high voltage to the system
spark electrode. This causes a spark from electrode to ground.
Outdoor Sensor
When equipped, the outdoor sensor monitors outdoor temperature
and adjusts the set point to provide greater efficiency.
(Optional) Indirect Tank Sensor – Indirect Priority
UNCRATING THE APPLIANCE
- Any claims for damage or shortage
in shipment must be filed immediately against the transportation
company by the consignee.
