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iGrow 1800 Installation Guide
Page85
Link4 (714) 524-0004
When the pump is activated to maintain the desired setpoint it will pulse on and off. It pulses in order to not
overshoot the setpoint.
Vent (Proportional) Programming
Note:
This equipment type requires 2 consecutive output channels 1&2, 3&4, etc. The first channel (odd
numbered)
must
be wired to OPEN the vent, and the other (even numbered) to CLOSE it.
07/08 Top V Vent
N C1 C2 C3 C4 C5 C6
10 20 40 80 40 0 0
Open Time 01m 35s
The vent opening is defined in percentage terms where 0% is vent closed and 99% is where the vent is fully
open. NORM is the normal stage when neither heating nor cooling is usually required. C1 is the lowest stage
of cooling, and C6 is the highest (or maximum) cooling stage. Enter your desired vent opening percentage for
each of the stages.
The
Open Time
is the time in minutes and seconds that it takes for the vent to go from its full closed to full open
position or vice versa.
Note:
to determine the vent open time turn manual toggle switch on, and using a clock or stopwatch, time the
vent as it goes from it’s closed to open position.
07/08 Top V Vent
Dir N Min Max
WindWd 15 30mph
LeeWd 15 40mph
Wind Overrides
Wind overrides limits are important for safe and effective vent operation. Of course, a weather station (or Link4
anemometer) must already be installed to use this feature. First you have to set
Dir
, which is the direction that
the vent faces when open. You have eight choices. N, NE, E, SE, S, SW, W, NW.
Next, you will need to set a
Min and Max
vent opening for the case with the wind blowing into the vent
(Windward) and similarly for the case where the wind is blowing across or over the vent (Leeward). The
program calculates an average wind speed. This is a running average over approximately 5 seconds. Once
the average wind speed exceeds the
Min
value the vent begins to close. As the wind speed increases and
approaches the
Max
value, the vent will go to the full close position.
The third vent screen is shown below.
07/08 Top V Vent
Wind Ovr Hold 2m
If Rain MaxOpen 5%
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