Note. Depending on the vehicle and engine version, a non-return valve may be additionally built into the coolant circuit. Via this non-return valve, a certain amount of coolant flows back through the small circuit to the engine, even if control signals are supplied to the heater coolant shut-off valve -N279-. After replacing the auxiliary heater, pay attention to the correct adaptation of the new auxiliary heater. When replacing an autonomous heater with the number VKO xxx xxx, VYai xxx xxx or 4N0 xxx xxx to the index "A"for an auxiliary heater with part number 4H0 xxx xxx starting with index 'B" The adaptation for the control signal of the circulation pump -V55- must be activated using the additional control unit. heater -J364- in climate control mode, settings (for an autonomous heater with number 4H0 xxx xxx, starting with the index "IN", this function is disabled). If V55- at the request of the climate control and display panel, the settings of the Climatronic control unit -J255- from -J364- are not activated, on certain vehicle versions (depending on engine and production period) Faults may be reported due to low or insufficient heat output. If in vehicles in which the manufacturer has installed an autonomous heater with the number 4Н0хххххх, starting with the index "IN" (installed since 2012 MY), -V55- is activated by the request -J255- from J364-, this can also lead to a complaint.
Connecting an auxiliary heater to a vehicle without a check valve
Note. -Arrows- indicate the direction of coolant flow. When the heater coolant shut-off valve -N279- receives control signals (e.g. in auxiliary heater mode). When the coolant is not warmed up and the ignition is switched off, the coolant is drawn in by the circulation pump -V55- directly from the climate control heat exchanger.
I 1. Autonomous heater; 2. Coolant return line to the engine. Connecting the climate control system to the engine coolant recirculation circuit; 3. Heater coolant shut-off valve -N279-; 4. Climate heat exchanger, installations. Connecting the climate control system to the engine coolant circuit; 5. Coolant flow from the engine. Connecting the climate control system to the engine coolant recirculation circuit; 6. Circulation pump -V55-. The circulation pump -V55- is connected to the hose connection of the auxiliary heater.
Connecting an auxiliary heater to a vehicle with a non-return valve
Note. With heating coolant shut-off valve -N279- operating (for example, in the autonomous heating operating mode, with the coolant not warmed up and the coolant ignition turned off) The coolant is drawn in by the circulation pump -V55- directly from the climate control heat exchanger. If the heating coolant shut-off valve -N279- is not working (for example, when the coolant is warm and the ignition is turned on) The coolant is supplied from the climate control heat exchanger back to the engine.
II 1. Autonomous heater; 2. Heater coolant shut-off valve -N279-. In autonomous heating mode, used additional heating is controlled. heater -J364-; 3. Heat exchanger climate, installations; 4. Coolant return line to the engine; 5. Coolant flow from the engine; 6. Circulation pump -V55-, connected to the hose connection of the auxiliary heater.; 7. Check valve. An element of smaller diameter to throttle fluid flow. Installation location depending on the engine: in the plenum box or engine. compartment Through this non-return valve, when the engine is running and the heater coolant shut-off valve -N279- receives control signals, coolant flows back into the engine via a small circuit. This connection between the heat exchanger supply pipe and the return line to the engine is installed on vehicles with a built-in check valve; 8. Check valve. An element of smaller diameter to throttle fluid flow. Installation location depending on the engine, in the plenum box or motor. compartment Through this non-return valve, when the engine is running and the heater coolant shut-off valve -N279- receives control signals, coolant flows back into the engine via a small circuit. This connection between the return line to the engine and the return line to the auxiliary heater is installed on vehicles with an integrated non-return valve.
Visitor comments