Pioneer PHR100-55 Instruction Manual page 10

Bottom Water Temperature Sensor
This sensor monitors return water temperature. The control module reduces or increases heater input
accordingly.
Temperature and Pressure Gauge
Allows the user to monitor system temperature and pressure.
Control
The integrated control system monitors return and supply water temperature. The control system
regulates the unit's BTU output by controlling fan speed, allowing the unit to deliver only the amount of
heated energy required.
Burner
Constructed with metal fiber and stainless steel, the burner uses pre-mixed air and gas, providing a wide
range of firing rates.
Electrical Field Connections with Terminal Strips
The cabinet allows easy access to the line voltage and low voltage terminal strips, which are clearly
marked to facilitate wiring to the heater.
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. The 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 heater, down to a suitable drain. If the
condensate outlet is lower than the drain, you must use a condensate removal pump (kit 554200,
available from HTP).
A condensate filter, if required by local authorities, can be made up of lime crystals, marble or phosphate
chips, and will neutralize the condensate. This can be purchased from HTP (7450P-212) and installed in
the field.
It is also very important that the condensate line is not 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.
A second vent may be necessary to prevent a condensate line vacuum lock in a long, horizontal line.
Also, an increase in pipe size may be necessary to drain properly. Support of the condensation line may
be needed to avoid blockage of 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
The outdoor sensor allows the installer to make the heater even more efficient by basing temperature
delivered to the central heating circuits on outdoor temperature. (See Optional Equipment, Section C).
(Optional) Indirect Tank Sensor – Indirect Priority
To control the temperature of low temperature heating circuits when using an indirect fired water heater, a
thermostatic mixing valve is required. Failure to install a thermostatic mixing valve could result in property
damage.
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