ad8370p3004a

Heater booster (ZUH) diagnosis, function check

Typ ad · téma 83.70 · verze 0103 · 2003-06-13

Platí pro: MODEL 168 with ENGINE 668.940 with heater booster MODEL 202 with ENGINE 611.960 with heater booster MODEL 210 as of 1.9.96 with ENGINE 602.982 with heater booster MODEL 210 with ENGINE 611.961 with heater booster

Není k dispozici v jazyce „cs“; zobrazeno v jazyce Angličtina.

Zařazení

Funkční skupina 3 Nástavba › 83 Klimatizace › 83.70 Nezávislé topení, přídavné topení, přihřívač — Řada 168 · Řada 202 · Řada 210 · Řada 602 (modely 982) · Řada 611 (modely 960, 961) · Řada 668 (modely 940)

AD83.70-P-3004A

Heater booster (ZUH) diagnosis, function check

12.8.97

MODEL 168 with ENGINE 668.940
with heater booster

MODEL 202 with ENGINE 611.960
with heater booster

MODEL 210 as of 1.9.96 with ENGINE 602.982
with heater booster

MODEL 210 with ENGINE 611.961
with heater booster

Danger!

Risk of explosion due to fuel vapors, risk of poisoning from inhaling combustion gases and risk of injury from burns during or after heater operation.

Do not put stationary heater/auxiliary heater or engine with heater booster into operation in confined spaces or while refuelling. Allow heater unit to cool down after operation and wear safety gloves.

AS83.70-Z-0002-01A

Heater booster (ZUH) diagnosis, advanced information

AD83.70-P-2002A

Preparations for function check of heater booster unit

AD83.70-P-3004-01A

Check coolant circuit. The circuit must be adequately filled with coolant and bled carefully. Coolant lines must not be kinked or pinched.

Coolant temperature 20°C

Battery voltage 11 - 14 V

Heater booster switch, if fitted, in "Heater booster On" position

Function check

Scope of test

Operation/Requirement

Specified value

Possible cause/Remedy

1

Start heater boost operation

Start vehicle engine

Operating noise of combustion air blower in heater unit audible and detectable air flow at exhaust gas outlet

AD83.70-P-4003A

AD83.70-P-5002A

2

Fuel delivery starts after approx. 40 seconds and combustion air blower is switched off for 3 seconds

Fuel metering pump cycles audibly

AD83.70-P-4003A

AD83.70-P-5002A

3

The combustion air blower is switched on again and the cycling frequency of the fuel metering pump is reduced simultaneously

Operating noise of combustion air blower and slower cycling noise of the fuel metering pump is audible

AD83.70-P-4003A

AD83.70-P-5002A

4

The speed of the combustion air blower is increased in two stages within 120 seconds, combustion starts and fuel delivery is increased

Audible increase in combustion air blower speed and cycling noise of fuel metering pump and exhaust gas flow heats up detectably at the same time

AD83.70-P-4003A

AD83.70-P-5002A

5

Combustion starts and stabilizes

The combustion air blower and fuel metering pump deliver audibly at their maximum speed or output in full load operation, the coolant temperature increases.

AD83.70-P-4003A

AD83.70-P-5002A

6

Terminate heater boost operation

Manually Switch off vehicle
engine

Automatically Coolant temperature reaches the cut-out threshold

approx. 73°C on model 210 up to 28.02.97

approx. 82°C on model 210
as of 01.09.96, models 168 and 202

Fuel metering pump switches off immediately, cycling noise is no longer audible

AD83.70-P-4003A

AD83.70-P-5002A

7

Heater unit run-on

starts

From part-load operation Run-on for approx. 110 seconds

Full-load operation Run-on for approx. 175 seconds

Audible operating noise of combustion air blower continues and air flow, which is slowly cooling down detectably, at exhaust gas outlet

AD83.70-P-4003A

AD83.70-P-5002A

8

Run-on terminates

Operating noise of combustion air blower no longer audible and detectable lack of air flow at exhaust gas outlet

AD83.70-P-4003A

AD83.70-P-5002A

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