DRYIT Semi-Continuous Tray Drier
Practical Action
Trouble Shooting
1. Difficulty with loading trays into cabinet
- Check dimensions of tray guides
- Is the angle iron ramped or recessed to the corners of the trays?
2. Tray not falling properly at top of stack
- Check tray guides, have tops of the tray guides been chamfered
3. Trays not falling cleanly at bottom of stack
- Check width of tray with the angle iron lengths attached. Is the tray width the distance
between fingers lowered position minus 2mm
- Are all the fingers fully lowered when lifting handle is horizontal? (if not see below)
4. Unable to properly raise trays
a. Check that all fingers are fully lowered when lifting handle is horizontal. If not make
necessary adjustments to length of tie rod and/ or stop mechanism
b. Check that all fingers move up together when handle is pulled down
- If not check the lifting mechanism for slack i.e. properly tightened nuts and bolts
- If the fingers are still not moving up together make adjustments to length of tie rods to
ensure that when fingers are in the fully raised position the stack of trays can be lifted
clearly and evenly (i.e. trays do not slip off end of finger)
- If the trays are still slipping off the fingers, Small adjustments can me made to the finger
length by building up the tip with held?
5. Doors
- All doors should be open and closed easily. If during construction of frame the doors
operate properly but once cladded the doors do not open or shut properly it may be that
the inner frame has shifted out of square. It will be necessary to adjust the doors
accordingly. A temporary measure is to correct the inner frame shape using a wedge of
wood jammed between the inner and outer frames.
6. Heater Blower
- A manual is provided with the UK manufacture heater blower unit most commonly used
with the Practical Action Tray Drier
Additional Points
A flue must be connected to the heater unit to take away exhaust gases. This should not
contain any sharp bends (smaller than 45 degrees) as otherwise the efficiency of the burner
is affected.
Operation at high altitude: At high altitudes there is less oxygen available for combustion and
there is less weight of air per unit volume being forced through the drier. Unless adjustments
are made to the burner - for example, smaller injector nozzle size and/ or increasing amount
of air entering burner – then combustion efficiency will be poor.
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