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Functional description of independent/auxiliary heater E65
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"Main functions
There are three different main functions. Independent heating, auxiliary heating and pseudo auxiliary heating.
Implausibility
When criteria are identified which call for the auxiliary/independent heater to be deactivated, it is first necessary to wait for the IHKA OFF command. Therefore, in this case, the auxiliary/independent heater starts a codable timer (default value: 10 seconds) within which the IHKA OFF signal must come. if it does not come, the auxiliary heating system switches off automatically and sends its status ”Off due to implausible operating mode”. This must be acknowledged by the IHKA (integrated automatic heating / air conditioning system) to enable a new start.
Independent heating, petrol/gasoline and diesel
For independent heating, the outside temperature must lie below 16°C in the case of preselected switching time. Direct switching on via the Control Display is possible at all times.
Switch-on conditions (each of the following points must be satisfied - AND condition)
Telegram switch on SH_ZH (telegram comes from the IHKA and can be triggered by a preselected switch-on time at the Control Display, direct operation selection at the Control Display, Telestarter.)
No fault
No fault lockout of heater
Engine OFF
Range for fuel quantity more than 50 kilometres
Switch-off conditions (each of the following points necessitates switching off of the independent-heating procedure or prevents switching on - OR condition)
Telegram switch off SH_ZH (telegram comes from the IHKA and can be triggered by Control Display, direct operation deselection at the Control Display, telestarter, heating time elapsed)
Fault
Heating time elapsed (usually 30 minutes)
10 seconds implausibility (see Implausibility with independent heating)
Undervoltage detected
Implausibilities / criteria (each of the following points necessitates switching off of the independent-heating procedure - OR condition)
Status, engine running
Operating mode not equal to independent heating
Deactivation of stationary consumers by power module
Undervoltage
Auxiliary heating, diesel only
In conjunction with the IHKA, the independent/auxiliary heater acts as an auxiliary heater to increase the heat output if needed.
Switch-on conditions (each of the following points must be satisfied - AND condition)
Telegram switch on SH_ZH (telegram comes from the IHKA and auxiliary-heating conditions must be satisfied)
No fault
Status, engine running
Terminal 15 ON
Switch-off conditions (each of the following points necessitates switching off of the auxiliary-heating procedure or prevents switching on - OR condition)
Telegram switch off SH_ZH (auxiliary-heating conditions not satisfied)
Fault
10 seconds implausibility (see Implausibility with auxiliary heating)
Undervoltage detected
Implausibilities / criteria (each of the following points necessitates switching off of the auxiliary-heating procedure - OR condition)
Status goes from engine running to engine off
Terminal 15 OFF
Operating mode not equal to auxiliary heating
Undervoltage
Missing telegrams from IHKA, CAS, DME (communication check)
Pseudo auxiliary heating
The newly introduced pseudo auxiliary heating serves to increase comfort and is intended to prevent the changeover valve from being switched over to the large engine coolant circuit during the auxiliary-heating phase when the engine is started - which would result in a drop in the heating-water temperature and thus in reduced heat output.
Switch-on conditions (each of the following points must be satisfied - AND condition) Precondition is that independent heating is operating and the transition from ”Engine not running” to ”Engine running” is detected.
Telegram switch on SH_ZH (telegram comes from the IHKA and is transmitted from terminal R cyclically, even with independent heating)
Condition, pseudo auxiliary heating set (coding bit = 1)
No fault
Terminal 15 ON
Status, engine running
Switch-off conditions (each of the following points necessitates switching off of the pseudo auxiliary-heating procedure or prevents switching on - OR condition) A distinction must be made between petrol/gasoline and diesel engines
Operating mode auxiliary heating (diesel only), pseudo auxiliary heating or changeover valve off -> transition to auxiliary-heating mode
Telegram switch off SH_ZH, reasons can be: Direct OFF, auxiliary-heating conditions not satisfied, petrol engine
Fault
10 seconds implausibility
Undervoltage
Implausibility / criteria (each of the following points necessitates switching off of the pseudo auxiliary-heating procedure - OR condition)
Status, terminal 15 OFF
Status, engine OFF
IHKA must switch to auxiliary heating
Operating mode not equal to pseudo auxiliary heating
Undervoltage
Missing telegrams from IHKA, CAS, DME (communication check)
Service functions
Overheating lock
In the event of a temperature-control failure or partial overheating, e.g. as a result of a lack of water, the overheating protection switches off the independent/auxiliary heater permanently. If the overheating lock is activated, an entry is made in the fault memory of the independent/auxiliary heater.
Heater lock
The auxiliary heating system is permanently locked if three malfunctions or three faults relevant to operation have occurred in sequence - i.e. without correct operation in between. For example, lack of fuel on a number of occasions could lead to failure to generate a flame. Here, the heater lock is activated, which leads to an entry in the fault code memory of the auxiliary heating system. This fault is not identical to the overheating lock fault.
Fault
The fault lockout occurs when a fault is detected during operation and the auxiliary heating unit switches off.
Restart
Fault
It only needs to be switched OFF once to cancel the fault lockout. It can then be restarted.
Heater lock
The heater lock is unlocked using the service function ”Unlock auxiliary heating system” AND then by pulling the fuse of the auxiliary heating system (disconnect power).
Country and coding versions
Country versions
No country versions present.
Coding versions
The independent/auxiliary heater is coded once at the factory. A distinction is made between petrol/gasoline and diesel-coded independent/auxiliary heaters. The independent/auxiliary heater cannot be coded in the dealer organisation."