Triggering Heater Mode With Remote Control

Triggering Heater Mode With Radio Remote Control Immediately - Function

Shown On Models 215, 220:

Operating procedure
1 Basic requirements:
- Ignition (terminal 15) OFF.

2 The "ON" button on the STH radio remote control transmitter (A8/3) was used to activate heater operation.
3 The CTEL antenna (A2/22 or A2/49a1) registers the cut-in signal and forwards it to the STH radio remote control receiver (A6/1).

NOTE: In vehicles with a telephone, the cut-in signal acquired by the CTEL antenna (A2/22 or A2/49a1) is forwarded via an antenna splitter to the STH radio remote control receiver (A6/1).

4 The STH radio remote control receiver (A6/1) directly initializes the STH or heater booster control module (A6n1) with the signal "Stationary heater ON" via the STH switch (N72s12 or S46).

5 The STH or heater booster control module (A6n1) recognizes the cut-in signal and starts the heat or ventilate inquiry in the operating and control module (N18, N22 or N22/7) via the CAN Class B (CAN-B).

6 The operating and control module (N18, N22 or N22/7) activates, if present, its display field and compares the current in-car temperature with the preset temperature value.

7.1 Interior temperature < preset temperature value:
- The operating and control module (N18, N22 or N22/7) transmits the "Heat" signal to the STH or heater booster control module (A6n1) via CAN Class B (CAN-B) and switches to stationary heating mode. The heat symbol is activated in the display field, if fitted.
- The STH or heater booster control module (A6n1) initiates STH heater or heater booster (A6) operation.
- The green or red indicator lamp in the emergency STH control switch (N72s12 or S46) indicates the fact that heater operation is active by being permanently illuminated.

7.2 Interior temperature > preset temperature value:
- The operating and control module (N18, N22 or N22/7) transmits the "Ventilate" signal to the STH or heater booster control module (A6n1) via CAN Class B (CAN-B) and switches to stationary ventilation mode. If a display field is provided the fan symbol will be activated.
- The STH or heater booster control module (A6n1) initiates stationary ventilation and transmits the "Fan ON" signal to the operating and control module (N18, N22 or N22/7).
- The green or red malfunction indicator lamp in the STH switch (N72s12 or 846) indicates that stationary ventilation is active by flashing on and off.

NOTE: Ignition (terminal 15) ON

- With the ignition switched on, the STH or heater booster control module (A6n1) starts the heat or ventilate inquiry in the operating and control module (N18, N22 or N22/7) after heater operation has been triggered, as it does with the ignition switched off.
- In this case the control and operating module (N18, N22 or N22/7) picks up the STH or heater booster control module (A6n1) signal in the back ground, always replies with the "Heat" signal and continues with its normal operating mode.
- When the ignition is switched off and heater operation continues to remain active, the signal acquired in the back ground causes the operating and control module (N18, N22 or N22/7) to change modes automatically. The module then switches to stationary heating or stationary ventilation mode depending on the interior temperature. The output of a further signal by the STH or heater booster control module (A6n1) is not therefore necessary.