User defined variables operating parameters

HEATSET: The heating target temperature (72°F).

SETBACKTEMP: The minimum set back temperature allowed (55°F).

MAXOATHEAT: The maximum outside air temperature for heating to be utilized (65°F).

OCCLOWOAT: The low outside air temperature parameter to be used for hot water reset during occupied time of day (0°F).

OCCHIGHOAT: The high outside air temperature parameter to be used for hot water reset during occupied time of day (60°F).

OCCLOWSWT:

OCCHIGHSWT:

UNOCCLOWOAT:

UNOCCHIGHOAT:

UNOCCLOWSWT:

UNOCCHIGHSWT:

The low hot water supply temperature parameter to be used for hot water reset during occupied time of day (120°F). The high hot water supply temperature parameter to be used for hot water reset during occupied time of day (190°F). The low outside air temperature parameter to be used for hot water reset during unoccupied time of day (0°F). The high outside air temperature parameter to be used for hot water reset during unoccupied time of day (40°F). The low hot water supply temperature parameter to be used for hot water reset during unoccupied time of day (120°F). The high hot water supply temperature parameter to be used for hot water reset during unoccupied time of day (160°F).

Measured variables:

ACTUALTEMP:

OATEMP:

The temperature being controlled by the I/0 point in question. In this case of a central boiler, the ACTUALTEMP shall represent the coolest of all of the zone temperatures. Refer to the Analog Temperature Assignment List to relate the temperature inputs to the control outputs.

Outside air temperature.

Calculated variables:

MANOVRFLAG: Holds the cue for a manual override of normal program logic, 0 = manually override off, 1 manually override on, 2 = no manual override in effect. This is calculated by the MANOVR sub program.

MINFLAG: Holds the cue for whether a point is currently being controlled by its minimum on or minimum off time, 0 = it is not currently affected by minimum on/off, 1 = it is currently affected by minimum on/off times.

TOD: Holds a value of 1 if the point is within its time of day schedule, 0 if the point is not within its time of day schedule.

MODETEST: Holds the cue for the System Mode, 0 = heating season, 1 = non-heating season. Its contents are determined by the MODETEST

algorithm that is called from this algorithm.

TURNON: Holds a value of 1 if the point should be turned on, 0 if the point should be turned off.

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