iGrow 1800 Installation Guide
Page90
Link4 (714) 524-0004
Wtr Temp-
Min
Min is the minimum water temperature of the supply pipe. If the supply water temperature ever goes below this
value the mixvalve will adjust increase the supply water temperature. Use the + or – buttons to select the
correct temperature.
Max
Max is the Maximum temperature that the supply water should ever become. If the supply water temperature
ever approaches this value, the mixvalve will adjust low the supply water temperature. This is especially
important when PVC pipes are being used. Use the + or – buttons to select the correct temperature.
Open Time
Open Time is the time it takes for the Mixvalve to go from fully opened to fully closed. Measure this time with a
watch, add a few seconds, and then enter it into Open Time field.
01/02 Valve1 MixV
Heating Delay
01 h 15 m 00 s
Use
Pump 1
Heat Turn On Delay
Heat Turn On Delay is the estimated time it takes for the heating system to affect the greenhouse temperature.
This is determined by taking a temperature reading with all heating & cooling equipment off and the mix valve
closed, then manually switching the mix valve open. Measure the time it takes for the ambient temperature
within the greenhouse to rise 2 deg.
Use Pump
If you want the iGrow1800 to control a pump associated with the mixvalve system, this is where you select
which pump to control. You must use one Output Channel to control the pump. For more information on how to
setup the pump, see the Pump Control section of this manual.
01/02 Valve1 MixV
Shock Prot:
No
if Temp3 < 105.0°F
limit to 5% open
Shock Protect
Setting Shock Protect to
Yes
forces the Mixvalve to open slowly, preventing an inrush of cold water into your
boiler system. Shock Protect will work two different ways depending on whether or not you have a return temp
sensor assigned below. Without a Temp sensor the iGrow1600/1800™ will still protect your boiler by adjusting
how quickly the valve opens based on how long it’s been since the valve was opened last. The longer the time,
the slower it will open. If you do assign a temperature probe, then the iGrow1800™ follows the “if Temp(1) is
less than some temp then only open some percentage”.
if Temp(3) < 140°F limit to 5% open
If you have a temperature probe, assigned as Temp1 in the example above, then these are the settings for the
return water supply to the Mixvalve. In this example, if the return water temperature is below 105°F then the
mixvalve will only open 5% until the return temperature reaches the low temperature setpoint of the supply
water temperature.
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