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Hi here are the feeds the heater uses not sure but if it is on full oad and used the circulation pump the total load is like 46w, is that too much of a draw? ....either way this heater thermotopZ is used to warm the engine coolant when temp of coolant is under 60C AND the outside temps is under 5c.....at the bottom i have included a full list of how it works taken off webastos site, and attached a pdf.....if anyone else interested....
Heater
Nominal voltage12 V
Operating voltage range10.5 ... 15 V
Nominal power consumption without circulation pump (without vehicle air fan)
Full load 32w
Part load 18 W
With Circulation pump
Nominal power consumption14 W
ThermoTopZ/C3FunctionalDescription3013.Functional Description3.1Functional Description Thermo Top Z (Supplementary Heater)
3.1.1Switch On/StartingFuelWhen starting the vehicle engine the heater goes in standby. With a water circuit temperature below 60 °C and an outside temperature below 5 °C (option with outside temperature sensor) the starting sequence commences.The glow plug and the combustion air fan are activated. After 30 seconds the fuel dosing pump starts operation and combustion air fan operation is suspended for 3seconds. Subsequently the combustion air fan speed is increased in a ramp within 57 seconds to nearly full load operation.After reaching full load fuel delivery within this period the glow plug is deactivated and the combustion air fan operation increased to full load.During the subsequent 45 seconds as well as in normal operation the glow plug functions as flame sensor to monitor the flame condition.After all these events the automatically controlled heating operation starts. In case of a no flame condition or a flameout, a restart is automatically initiated. If the no flame condition persists, fuel delivery is stopped and the heaters enters an error lockout with a run-down of the combustion air fan.DieselWhen starting the vehicle engine the heater goes in standby. With a water circuit temperature below 60 °C and an outside temperature below 5 °C (option with outside temperature sensor) the starting sequence commences.The glow plug and the combustion air fan are activated. After 30 seconds the fuel dosing pump starts operation and combustion air fan operation is suspended for 3seconds. Subsequently the combustion air fan speed is increased in two ramps within 56 seconds to nearly full load operation. After a stabilisation phase (constant speed) of 15 seconds the combustion air fan speed is again increased in a ramp within 50 seconds to nearly full load.After reaching full load fuel delivery the glow plug is deactivated and the combustion air fan operation increased to full load.During the subsequent 45 seconds as well as in normal operation the glow plug functions as flame sensor to monitor the flame condition.After all these events the automatically controlled heating operation starts. In case of a no flame condition or a flameout, a restart is automatically initiated. If the no flame condition persists, fuel delivery is stopped and the heater enters an error lockout with a run-down of the combustion air fan.A flameout during normal combustion operation causes an automatic restart.
3.1.2Heating OperationFuelWhen the temperature rises to reach 72 °C the heater switches to the energy saving part load operation. A rise in temperature up to 76.5 °C causes the heater to enter a control idle period. This also happens when exceeding a total heating operating time of 76 minutes.After cool-down of the coolant to 71 °C the heater resumes part load operation. Another rise in temperature to 76.5 °C causes the heater to enter again the control idle period. A drop in the coolant temperature during part load operation due to an increased demand in heat will cause the heater to switch to full load operation at 56 °C.
DieselHeating operation for the Diesel type heater is identical in the sequence of events. Should the coolant temperature drop during the control idle period to but not below 71 °C within 900 seconds, a subsequent drop in the coolant temperature below 71 °C causes the heater to perform a regular starting sequence into full load operation.A drop in the coolant temperature during part load operation due to an increased demand in heat will cause the heater to switch to full load operation at 65 °C.3.1.3
Switch Off/DeactivationWhen turning the engine off the heater is deactivated. Combustion stops and run-down commences. The combustion air fan first continues operation to cool the heater down (run-down) to be automatically switched off afterwards.NOTEThe run-down time and the combustion air fan speed depend on the heater operating condition at the time of deactivation.Run-down time is for:Fuel168 seconds when deactivated in full load operation and157 seconds when deactivated in part load operation.Diesel175 seconds when deactivated in full load operation and100 seconds when deactivated in part load operation.Dependent on the software variant implemented in the control unit there might be deviations from those run-down periods.
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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N
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