5 Troubleshooting
Thermo 230 / 231 / 300 / 301 / 350
502
Heater operation stops because heat exchangers
connected do not dissipate enough heat.
Rate of flow too low, because
•
air in heater, in heat exchangers or in system
sections.
•
cocks (flow regulator) throttled, contaminated or
closed.
•
contamination in system, e.g. in areas of restricted
flow.
•
circulation pump rate of delivery insufficient (air in
pump housing).
wrong sense of rotation – check wiring colors
(black + / brown –).
•
not enough anti-freeze.
•
excessive system resistance (especially high when
cold).
•
circulation pump defective.
Heat exchanger dissipate not enough heat,
because
•
air in heat exchangers or in system sections.
•
contaminated heat exchanger surfaces (external).
•
insufficient air intake or exit.
•
fan: rate of delivery low / wrong sense of rotation /
resistance too high.
•
too much anti-freeze.
•
heat exchanger of too low capacity.
Rough calculation of rate of flow
heat flow [kW] acc. to ident. label
Rate of flow in [l/h] =
x 860
temperature difference
∆
t in [K] or [°C]
measured between heater water inlet and outlet
(e.g. with contact thermometer)
Fault in fuel supply
No fuel delivery to heater.
•
fuel tank empty.
•
kinked, closed, contaminated or leaking lines.
•
paraffin deposits or water captured in fuel filter or fuel
lines.
•
vent in tank clogged.
•
fuel lines interchanged.
•
fuel filter contaminated.
•
fuel screen in pump contaminated.
Fig. 501 General Fault Symptoms (Sheet 2 of 3)
Symptom
Probable Cause
Summary of Contents for thermo 231
Page 2: ......
Page 10: ...1 Introduction Thermo 230 231 300 301 350 104 Page empty for notes...
Page 26: ...4 Technical Data Thermo 230 231 300 301 350 404...
Page 50: ...7 Circuit Diagrams Thermo 230 231 300 301 350 712...
Page 72: ...10 Packaging Storage Shipping Thermo 230 231 300 301 350 1002 Page empty for notes...
Page 73: ...Thermo 230 231 300 301 350 Annex A A 1 Annex A Scheduled Maintenance...
