11
NOTE: OPTIONS 9 - 14 ARE IN PAIRS, DARK HOURS + LIGHT HOURS.
YOU CAN SET A DAY CYCLE AT ANY LENGTH, 12 TO 36HRS.
Set Vegetative cycles shorter to maximise crop rotations.
Short day Flowering cycles to get produce harvested early and to market.
9) Veg Light Hours. Hour’s lights are ON during the vegetative growth stage. Default is 18 hours.
10) Veg Dark Hours. Hour’s lights are OFF during the vegetative growth stage. Default is 6 hours.
11) Fast Flowering Light Hours. Hour’s lights are ON during Flowering stage. Default is 6 hours.
12) Fast Flowering Dark Hours. Hour’s lights are OFF during Flowering growth. Default is 12
hours. Note: this gives an 18-hour day so the lights will be coming on during a different 6-hour
period each day.
13) Full Flowering Light Hours. Hour’s lights are ON during fruiting stage. Default is 12 hours.
14) Full Flowering Dark Hours. Hour’s lights are OFF during the fruiting stage. Default is 12 hours.
15) CO
2
Ppm Target. This is a bench mark value that defaults to 2000ppm. The controller will
dispense CO
2
to give a concentration at least 300ppm above this, then dispense CO
2
when the
concentration falls to this level.
16)
CO
2
Start Ticks An additional time allowance to “Top Up” CO
2
to attain 300ppm above target
CO
2
ppm. The default and usual setting for this is zero. You can enter a value from 0 – 99 (1/10
th
of seconds) in this field.
If CO
2
over-runs target CO
2
ppm, reset this to 00.
•
CO
2
Fine Control
(in Versions 1.24 and later.). Auto adjustment of CO
2
Top Up time, to most
accurately attain 300ppm increase. Set to
On or OFF
17)
CO
2
Ppm/Min. The delivery rate of the CO
2.
Measured and constantly updated every time the
carbon dioxide is dispensed to give a rise of more than 600ppm. You may need to change this
value (enter 3000 – 6000ppm/min) if the controller has lost the CO
2
dispense rate. Symptoms are
when CO
2
levels do not get high enough even though there is plenty of CO
2
.
This value is continually relearned by Harvest-Master.
18) CO
2
Min Duration. The carbon dioxide cycle's minimum duration is measured in minutes. The
controller will not start a CO2 cycle if it calculates that the maximum temperature or humidity
will be exceeded in less than the time you set here. In hot areas, the 30min default value may need
to be reduced to 15 mins.
19) Co2HumidityIncr. The carbon dioxide humidity increase is the allowable humidity increase
above the Maximum Humidity (set in (7) above), during a CO
2
cycle. The value defaults to
15RH. This means if you have a maximum humidity set at 60RH, then during a CO
2
cycle, the
humidity can rise to 60 + 15 = 75RH before the fans are turned on to end the cycle.
20) CO
2
Delay. At the start of a CO
2
cycle, it is likely that the fans have just been turned off. The
delay gives time for fans to stop spinning and removing air (including CO
2
you are dispensing)
from the room. The default is 10 seconds. If in doubt, make it 30 seconds.
21) Humidify&Fans? Should a humidifier be used when Fans are ON? It may be self-defeating. If so,
set to NO. If acceptable, set to YES. The controller will determine, during calibration, if the
humidity can be increased while the fans are removing air from the room. If calibration is carried
out during a humid day the humidifier may not be able to make much difference and the
controller could get it wrong.
22) Dehumidify&Fans? Should a Dehumidifier be used when the Fans are ON? As for (21), select
YES or NO.
23) Off/On Light Mins. In the event of lights being turned OFF by Harvest-Master, most lights used
are HP Sodium or Metal Halide and these must be given time to cool after turning off before they
can be turned on again. This is the delay (minutes) before lights can be turned on.