Thermostat Anticipator
The thermostat anticipator setting recommended is 0.2 amps. Failure to correctly adjust this
setting may result in unsatisfactory comfort conditions, and could result in damage to the
thermostat.
This setting may have to be adjusted slightly to ideally match the boiler control system to the
thermostat, as well as overcome the normal inertia of the radiation system. A setting to low
will be characterized by a short cycle, which does not allow the room temperature to be
satisfied before the boiler shuts down. A setting too high will be characterized by a long cycle,
which allows the room temperature to rise too high before the boiler shuts down. Adjustments
should be made to the setting, if required, but should not exceed 0.1 amps per adjustment.
Newer electronic thermostats typically have provisions for the cycle length, and type of
heating system. The instructions for the thermostat should be followed.
In zoned systems where the thermostat is controlling a zone valve, or circulation pump and not
the boiler, the anticipator should be set to match the current draw of the zone valve being used.
Temperature Control Setting
The boiler has a temperature control knob know as an aquastat on the left hand side. This sets
the maximum temperature that the boiler will operate at. The internal control system monitors
the water temperature in the tank and modulates the heating elements to maintain the water
temperature. Note that the setting on the knob only sets the maximum temperature, it is
normal for the boiler to operate at lower temperatures than this setting at times, this is
especially true in the spring and fall when it is not so cold outside. The actual temperature
setting will be determined by the type of heating system the boiler is installed in.
Outdoor Temperature Sensor Connection
The outdoor temperature sensor should be mounted in a suitable location outside the building
where it will be exposed to the outside air. Mount the sensor high enough so it will not be
covered by snow or ice, and in a location where it will not be exposed to direct sunlight.
The outdoor temperature sensor is connected to the terminals “OD STAT” on the control
circuit board (see Fig. 4 and Fig. 5).
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