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However, if the room temperature falls below ''Set Point - 5.0°F (2.8°C) - Heating
Offset - Heater Differential'', the fans will begin to run at the minimum speed
specified for the first point of the curve and will continue to do so as
long as the room temperature remains below the set point. When the
room temperature rises above the set point, the fans will return to the cur-
rent minimum speed.
When the last point of the curve is reached, the curve becomes deactivated.
The controller maintains the minimum speed specified for this point until the
curve is reactivated or until a new single minimum speed is specified.
The minimum speed curve and the temperature curve are related in the
following ways:
The minimum speed curve can be activated only if the temperature
curve is already activated.
All points of the minimum speed curve, other than the first one, are auto-
matically given day numbers identical to those specified for the tempera-
ture curve. Only the first point of the minimum speed curve has an ad-
justable day number. This day number must be higher or equal to the
day number specified for the first point of the temperature curve and
lower that the day number specified for the second point of the tempera-
ture curve.
For example:
1
POINT
2
POINT
When the minimum speed curve is activated, it will effectively be operat-
ing (i.e. the controller will begin to adjust the minimum speed according
to the specified points of the curve) only when the current day number of
the temperature curve reaches the first day number of the minimum speed
curve.
TEMPERATURE CURVE
d5
d10
MINIMUM SPEED CURVE
d5 to d9 (adjustable)
d10 (not adjustable)
TC4-2N6F.rev.07
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