Martin Lishman Ltd. Registered in England & Wales no. 3793534. Registered office: Albion House 32, Pinchbeck Road, Spalding, Lincs., PE11 1QD
Using the Hot Box
1. Place a washed sample of potatoes in each wire tray with approximately 25 potatoes in each one. Make
careful note of where in the processing or grading line each sample was taken from, its variety and the
tray number.
2. Switch on the Isolator switch located on the front of the lower electrical cover.
Upon powering up the controller will display the current software version then display
OFF awaiting a command.
3. Set the thermostat control at 30°C and the humidity to 93%. Set the timer control at 12 hours.
4. Fill the water tray with clean water up to 5-10mm bellow brim. Insert the humidifier unit in to the water
near to fan.
5. Make sure the Hot Box door is closed.
6. To run the Hotbox program press the
RIGHT
arrow once and you will be asked if you wish to proceed.
The display will read RUN? To continue and run the program press the
RIGHT
arrow once more, or press
the
LEFT
arrow to cancel.
If the Controller has a program start delay set up in the parameter menu under
s.dly
, the controller will
count down in hours and minutes. Once the timer has expired the program will begin to run. The program
will run for the length of time set up under the run time
r n.t
parameter, keeping the temperature and
humidity inside the box to programmed levels setup in the
t E
and
r h
parameters.
The temperature, humidity and run time remaining can be viewed by using the up and down arrows.
7. The Hot Box will hold the internal temperature at 30°C and the humidity at the set point. It will switch off
automatically after 12 hours. After the 12 hours has elapsed, switch off the Hot Box at the socket.
8. The fan has a 20 minute run on timer to prevent overheating of the heating element.
9. Once the program has ended leave the door open to allow the RH sensor and inside to dry out.
Hot Box Care and Maintenance
The Hot Box is warm and damp by design and will harbour potentially dangerous microbes if not kept
clean. It is recommended the inside is cleaned regularly with an antibacterial cleaner and that the
water tray is refreshed at least once a week.
At the time of cleaning, check the seals inside the base are OK. If any breaks have occurred, re-seal
them with a mould resistant silicone seal.
It is advisable to leave the front door(s) open when not in use or especially just after use for best
results to allow the unit to air out.
The Electricity at Work Regulations 1989 require that any electrical equipment that has the potential to
cause injury is maintained in a safe condition.
Humidifying Ultrasonic Atomising Transducer
The transducer humidifier may require cleaning to remove mineral deposits dependant on hard water
areas to maintain performance. The recommended method is to soak the unit in vinegar for 30
minutes and clean with a small brush.
The humidifier has a water level sensor to avoid running dry. This sensor is also susceptible to
interference from mineral deposits and may require cleaning.
The humidifier ceramic membrane will eventually wear out (also dependant on the hardness of the
water). The membrane disc can be replaced with a kit available from Martin Lishman Ltd.
The humidifier works best in water depths of 45mm to 70mm.
The 9 litre water tray requires to be filled to approx. 5-10mm from the brim.
