Installation Manual 5.1.2
9
5.4 Priority Hot Water DHW Sensors
Systems with the on-demand priority hot water
generation will include a few extra sensors. Most
are internal to the system and require no field
installation. The domestic hot water tank sensor
must be mounted directly on the hot water tank.
This sensor will allow the Hydro-Temp unit to turn
on and off as needed to heat the hot water. The
sensor should be installed vertically above or beside
the bottom element between the steel tank and the
insulation as shown in the illustration below.
Vertical mounting provides proper surface contact
between the sensor and the round tank. The sensor
must be tight against the tank and well insulated.
Proper installation of the sensor is critical. If the
sensor were to come loose, the system could easily
overheat the tank, damaging the tank and/or the
Hydro-Temp system. After installation make
appropriate wiring connections to the Hydro-Temp
system. Wire the two legs of the sensor to the
terminal strip labeled “DHW Tank Temp”. Hydro-
Temp provides a mounting bracket to aid in keeping
the DHW tank sensor in direct contact with most
conventional hot water tanks. The clip, installation
instructions, and DHW tank sensor will be shipped
in a small plastic bag with one of the two wires
connected to the terminal strip inside the electrical
box of the Hydro-Temp system. The other wire is
intentionally left loose so the system will recognize
no sensor is connected.
5.5 Marathon Hot Water Tanks
Marathon hot water tanks require a "special" bracket
which allows the DHW tank sensor to be placed in direct
contact with the tank's existing thermostat bracket. This
is required due to the fact the Marathon tank is made of
a polyethylene material that does not readily conduct
heat and will not allow accurate temperature
readings. This bracket, holding screw, and instructions
are enclosed in the plastic bag containing the DHW tank
sensor.
Hot Water
Heater
INCORRECT
Hot Water
Heater
INCORRECT
Hot Water
Heater
CORR
ECT
Figure 5.1 Sensor Placement
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