iGrow 1800 Installation Guide
Page37
Link4 (714) 524-0004
Figure 4.17 Wiring Outdoor Temp/Humidity Sensor
CO
2
Sensor
1. Open up the front panel to the 90 deg. position, as shown in Figure 4.5. Make sure the cable supports
the front panel securely.
2. Find a location that is inside the greenhouse and also free from obstructions.
3. Run the free end of the sensor cable to the controller unit.
4. You may extend the sensor cable as needed, but make sure to use an adapter and wire
approved by Link4 to make any extensions (the wire and adapter can be purchased from Link4).
5. Carefully insert the cable through the right most watertight fittings at the bottom of the enclosure.
It is easy to strip insulation and/or break wires when pulling cable. If you want to bundle wires
tighter, use UV protected “tie wraps” (typically blue or black), and do not over-tighten.
Note:
If any splices are needed to extend cable length, make certain they are WATERTIGHT. Water or
fertilizer infiltration WILL cause unstable sensor readings.
6. Keep sensor cables away from interference sources, including high voltage power wiring,
inverters, motor controllers, mercury arc, or sodium lamp circuits. Placing sensor cable near such
wiring may cause erratic sensor readings.
7. Connect the wires as shown in Figure 4.18.
8. After installing the sensor, it is recommended that sensor be checked by plugging in the power
supply and testing under various conditions before moving on in order to make sure the sensor
works properly and accurately. You can perform this test by having one person breath on the
CO
2
sensor element (long cylinder protruding from the CO
2
enclosure) while the other person
views the CO
2
reading on the iGrow1600/1800. After testing remember to unplug the unit to
continue installing other sensors.
9. Refer to the CO
2
installation instructions that are shipped with the unit for more installation
details.
