Section C: Boiler Operation - Kanmor Mixing Control 362e Data Brochure

Section C: Boiler Operation

Section C1
Boiler Supply
Sensor
Section C1: Boiler Supply Sensor
BOILER SENSOR ON THE SUPPLY (Boil SENS = SUP)
The boiler sensor can be located on the boiler supply if the 362e is the only control that
is operating the boiler. When in the supply mode, the control determines the required
operating temperature for the boiler supply and cycles the Boiler contact in order
to maintain the correct boiler supply water temperature. If this mode of operation is
selected, the boiler pump should either operate continuously or be operated in parallel
with the Mixing Pump contact (Mix Pmp). The boiler pump should not be operated by
the operating aquastat as this may lead to improper cycling of the boiler because of
inconsistent flow past the boiler supply sensor. This mode of operation only works if
the Boil SENS item is set to SUP.
BOILER TARGET TEMPERATURE (Boil TRG)
The Boiler Target temperature is determined by the operation of the mixing device. The control uses a method called Boiler
Load Reset in order to determine the required boiler supply water temperature. The control operates the boiler at a supply
temperature that is sufficient to satisfy the requirements of the mixing device. If the boiler supply water temperature is not
sufficient, the control increases the boiler target temperature. If the boiler supply water temperature is more than sufficient, the
control decreases the boiler target temperature. If the control does not have a requirement for heat from the boiler, it does not
show a boiler target temperature. Instead, "– – –" is displayed in the LCD.
BOILER DIFFERENTIAL (Boil DIFF)
An on / off heat source such as a boiler must be operated with a differential to prevent short cycling. This differential is centered
around the Boil TRG temperature. If the boiler supply temperature drops ½ of the differential below the Boil TRG temperature,
the control closes the boiler contact to fire the boiler. If the boiler supply temperature rises ½ of the differential above the
Boil TRG temperature, the control opens the boiler contact to turn off the boiler. With the control, either a fixed or automatic
differential setting is selected. If the AUTO differential is selected, the control automatically adjusts the boiler differential setting
under the current load conditions to avoid short cycling.
BOILER MINIMUM (Boil MIN)
The Boil MIN is the lowest water temperature that the control is
allowed to use as a Boil TRG temperature. During mild conditions, if
the control calculates a Boil TRG temperature that is below the Boil
MIN setting, the Boil TRG temperature is adjusted to at least the
Boil MIN setting. During this condition, if the boiler is operating, the
Minimum pointer turns on in the LCD while the Boil TRG or the Boil
SUP temperature is viewed. If the installed boiler is designed for
condensing operation, set the Boil MIN adjustment to OFF.
BOILER MAXIMUM (Boil MAX)
The Boil MAX is the highest water temperature that the control
is allowed to use as a Boil TRG temperature. If the control does
target Boil MAX, and the Boil SUP temperature is near the Boil MAX
temperature, the Maximum pointer turns on in the LCD while the
Boil TRG or the Boil SUP temperature is viewed. At no time does the
control operate the boiler above 248°F (120°C).
BOILER PROTECTION (Boil MIN)
The control is capable of providing boiler protection from cold mixing system return water temperatures. If the boiler sensor
temperature is cooler than the Boil MIN setting while the boiler is firing, the control reduces the output from the mixing device.
This limits the amount of cool return water to the boiler and allows the boiler temperature to recover. This feature can only be
used if the Boil SENS item is not set to NONE.
BOILER OPERATION
When the control determines that boiler operation is required, the Boiler contact terminals (6 and 7) close. While the boiler
contact is closed, the burner segment in the LCD is displayed.
Section C2
Boiler Return
Sensor
Section C3
No Boiler
Sensor
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