EVAPORATIVE HUMIDIFIER UNIT
Operation and Installation Instructions
Description of the Humidifier Operation
The Humidifier works by constantly dribbling water over a specially treated absorbent paper
element. The element when fully "Wetted" provides a large evaporative surface area over which
the air passing over the element can take up the moisture. By constantly passing air over the
element it is ensured that the air is at the maximum saturation at all times. As the air only takes
up whatever water it can there is no danger of excess moisture being in the building. Any
water 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 operator
settings apart from setting the Auto On & Off times. After extended operating periods the paper
element 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 on
It is recommended that the water tank is drained off at least once a fortnight to remove any
contamination 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 an
AUTO / OFF/ MANUAL position. In MANUAL the Humidifier pump runs continuously. In
AUTO the unit will run in times "Set On" on the timeclock on the panel. Push the small pegs
in to set "On Times", pull pegs out to set "Off Times". For maintenance the Main On / Off
isolator 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 is
fitted. (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 Timeclock
is overridden. However the Timeclock can still be set and used independently as before if
EVAPORATIVE HUMIDIFIER UNIT
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.