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TC5-1N5FAB rev.06
TC5-1N5FAB
C
URTAIN OPERATING TIME COMPENSATION
The controller can use the current outside temperature to adjust the opening
and closing times of the curtains. As the outside temperature increases,
time on is increased, causing the curtains to open faster. As the outside
temperature decreases, time on is increased, causing the curtains to close
faster. To use this feature, set internal switch # 6 to ON. Note that an
outside probe must be connected to input # 5 in order for the compensation
to work. This feature must be activated from the front panel (see below).
Temperature Rises:
When the curtains open, the controller increases TIME ON by 4% for every
1°F (0.6°C) in the compensation interval (i.e. an interval of 3
o
F means a 12%
increase). The TIME OFF is decreased by the same amount.
Temperature Falls:
When the curtains close, the controller increases TIME ON by 4% for every
1°F (0.6°C) in the compensation interval (i.e. an interval of 3
o
F means a
12% increase). TIME OFF is decreased by the same amount.
Temperature
Outside
Set Point
Compensation
Interval
Current Outside
Temperature
Temperature
Outside
Set Point
Compensation
Interval
Current Outside
Temperature
Note that when the compensated TIME OFF value is less than 10 seconds,
it is set to zero.
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TC5-1N5FAB rev.06
TC5-1N5FAB
When the room temperature is below the set point, the Stage 1 fans operate
according to the minimum ventilation cycle. Running the fans even though
ventilation is not required for a cooling purpose is useful to reduce humidity
levels and supply oxygen to the room. It also prevents the fans from freezing
in winter.
During time on, the Stage 1 fans run at Stage 1 minimum speed. The Stage
1 Pilot Light turns on. During time off, the Stage 1 fans do not run. The Stage
1 Pilot Light turns off. The Stage 1 minimum speed can also be defined by
a speed curve (see below).
NOTE:
The controller supplies maximum voltage to the variable-speed fans
for 2 seconds immediately following each start-up.
Minimum Ventilation Cycle Settings
1.
To run the fans continuously at minimum speed, set time off to zero and
time on to any value other than zero.
2.
To stop the fans, set time on to zero and time off to any value.
3.
To run the fans intermittently, set time on to the desired running time
and time off to the desired off time.
M
INIMUM VENTILATION CYCLE
STAGE 1 — MIN. SPEED
OFF
TIME ON
STAGE 1
TIME OFF
STAGE 1
