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To help maintain high levels of relative humidity within crop storage buildings, Farm Electronics has developed a unique floor standing evaporative humidifier which halts damaging weight and quality loss in potatoes and other root crops during storage.
Farm Electronics have utilised the HUMIDRAFT humidifier coil and installed it in a floor standingmodule. Locating the assembly at floor level, makes installation of electrical and water supplies anddrainage much simpler and safer. Several modules can be stood side by side to provide sufficientsurface area for the air volume to be humidified.
The standard module occupies approximately 0.34m2 (3.2sq.ft)of floor space. With an airflow of some 1.7m3/s (3600 cub.ft permin) it is capable of maintaining the relative humidity levels atbetween 95%-98%. This enables the replacement of moisturelevels normally lost during cooling operations in storage, yetrequired to keep the stored crop in prime condition.
Controls for the humidifier unit are located in the remotecontrol panel. The control panel is fitted with a door interlockisolator switch, for complete electrical safety and a selectorswitch providing Automatic Off and Manual Run selections.In the Auto Mode the unit operates intermittently with presetrun and off periods. A simple timeclock controls the operationand can be set for almost any variation of On and Off periods.
Technical Details: Base Unit 110cm (w) x 31cm (d) x 265cm (h) Fan Normally utilises existing fans
Control Panel Epoxy coated enclosure with door interlockisolator Auto/Off/Manual selector switch and24hr On-Off Timeclock.
EVAPORATIVE HUMIDIFIER UNIT
Operation and Installation Instructions
Description of the Humidifier Operation
The Humidifier works by constantly dribbling water over a specially treated absorbent paperelement. The element when fully "Wetted" provides a large evaporative surface area over whichthe air passing over the element can take up the moisture. By constantly passing air over theelement it is ensured that the air is at the maximum saturation at all times. As the air only takesup whatever water it can there is no danger of excess moisture being in the building. Anywater not taken up by the air recycles safely within the humidifier housing water storage tank.
The Farm Electronics Humidifier operates virtually maintenance free and requires no operatorsettings apart from setting the Auto On & Off times. After extended operating periods the paperelement may have to be renewed. This will be as a result of water contamination deposits.Under normal conditions the element life should be a minimum of 2 to 3 seasons dependant onuse.
It is recommended that the water tank is drained off at least once a fortnight to remove anycontamination from the recycled water. This will greatly extend the element life.
The control panel for the Humidifier is very simple in operation. The main switch has anAUTO / OFF/ MANUAL position. In MANUAL the Humidifier pump runs continuously. InAUTO the unit will run in times "Set On" on the timeclock on the panel. Push the small pegsin to set "On Times", pull pegs out to set "Off Times". For maintenance the Main On / Offisolator at the bottom of the box can be used to gain access to the circuit breakers and fuses.
Optional Auto RH Control
It is possible to control the Humidifier on RH level demand if a separate RH controller isfitted. (i.e. Farm Electronics Model CH1 or CH2)
In this case whenever the panel is switched to AUTO and RH falls below the set point the Humidifier is started up until the RH rises back above the set level. The inbuilt Time clock is overridden. However the Time clock can still be set and used independently as before if required.
The unit should be sited in the desired location. The feet can then be rag-bolted to the floor.The base must be levelled using a spirit level. NB. It is very important that the unit is installed level. This is because the dribble bar must be level to obtain an even water flow over the element. Bolt the feet to the floor after levelling is complete. The pump motor and minimum water level cut off float switches are wired to the panel from the terminal box fitted to the module. Connect a suitable mains water supply to the ballcock in the water reservoir tank.It is recommended that a water isolation valve is fitted to allow future service isolation. Run the reservoir overflow pipe through to a point where water can be safely discharged making sure that this has a fall to outside along its length. Connect a 240v ac single phase supply to the main switch of the control panel. The total load of the panel is 1.0amps. To set up the water flow rate, switch the unit to manual. Adjust the flow valve on the pump at the base of the unit at the front, to regulate the water flow from the dribble bar to a steady trickle over the whole length of the bar (normally this is factory set). This flow can be viewed by removing the cover plate at the top of the evaporative element assembly. Once these steps are complete the unit should be fully operational.