Coal Feed Screw Not Turning - ALLAN'S Ecomax Auto-Stoker Installation And Operating Manual

Observed Fault
Coal Feed
Screw not
turning
F:\C - E\ECOMAX\COAL BOILER\Instructions and Manuals\Coal Boiler Manual Rev 6.doc
Page 29 of 36
Possible Cause
Pump water
temperature set
too low
Faulty Water
Temperature
Probe
Access doors
open
Safety switch on
coal pipe has
tripped
Water
overtemperature
switch has
tripped
Foreign object
jamming Coal
Feed Screw
Gearbox/motor
failure
Solution
The pump is factory set to turn on once the
water temperature reaches 65° (unless using a
mixing valve). This prevents too much cold
water surrounding the Combustion Chamber
and affecting combustion.
The Blower and Coal Feed Screw are set to
turn off at 75°. Residual heat should mean that
the actual water temperature does not exceed
85° after these shut off. This may depend on
the installation, if the water gets hotter than
this then the boiler thermostat should be turned
down.
The hotter the water temperature, the better the
response will be from the radiators in the
dwelling.
Replace Water Temperature Probe.
Make sure Ash Pan, Combustion Chamber and
Scrubber Chamber Doors are fully and
completely closed and the seals are effective
This is due to excessive heat in coal pipe,
possibly fuel burning in coal pipe. This switch
requires manual resetting. Ensure the condition
which caused the switch to trip is fixed before
resetting it.
This may be due to water getting too hot or
probe not properly seated in pocket This switch
requires manual resetting. Check the pressure
relief valve has not opened and released excess
pressure. If so the system will need to be
refilled.
See Dislodging a Stone from the Coal Feed
Screw section
Disconnect the motor from the gearbox and
turn on to see if the rotor still turns. Replace if
necessary.
Remove the tension clip and turn the Coal
Feed Screw with a spanner to check if it is
jammed.
Remove the gearbox from the Coal Feed Screw
and turn the input shaft by hand. The output
shaft should turn very slowly as the input shaft
turns. Replace if necessary.