Valeo spheros thermo 230, Руководство по ремонту

Страница: 22 / 71

502
Thermo 230 / 231 / 300 / 301 / 350 5 Troubleshooting
Heater stops as the connected heat exchangers
provides insufficient heat. Flow rate too small, because
•
Air in the heater, heat exchangers or in system
sections.
• Taps/valves (flow controllers) throttled,
contaminated, closed.
• Contaminations in the system, e.g. filters or at bottlenecks.
• Circulating pump delivery rate insufficient (air in
pump housing),
wrong sense of rotation – check wiring colors
(black + / brown –).
• Insufficient frost protection.
• System resistance too high (especially high in the cold).
• Circulating pump defective.
Heat exchanger provides not enough heat, because
•
Air in the heat exchangers and/or system sections.
• Contaminated heat exchanger surfaces (outside).
• Insufficient air entry or air exit.
• Fan: Insufficient delivery rate /
incorrect direction of rotation / resistance too high.
• Antifreeze content too high.
• Heat exchanger of too low capacity.
Approximate flow rate determination:
Heat flow [kW] according to type plate
Flow rate in [l/h] = x 860
Temperature difference Δ t in [K] or [°C]
measured on the heater between water inlet and water outlet
(e.g. using contact thermometer)
Error in the fuel supply
No fuel delivery to the heater. • Fuel tank empty.
• Bent, closed, clogged or leaking lines.
• Paraffin deposits or frozen water entrapments in fuel
filters or lines.
• Venting opening in tank closed.
• Fuel lines mixed up.
• Fuel filter contaminated.
• Fuel screen (filter) in pump contaminated.
Fig. 501 General Fault Symptoms (Sheet 2 of 3)
Error symptom Possible cause