Webasto Thermo Top C - PME Service Manual download pdf (Page 32)

Thermo Top E and Z/C 8 Servicing

8 Servicing

8.1 General

This section describes the servicing procedures allowed

on the heater when installed.

WARNING

There is a potential danger of skin burns as the heater and

its components may be very hot.

8.2 Work on the Heater

For any type of work on the heater the main power supply

cable is to be disconnected from the vehicle battery. As

long as the heater is in operation or in run-down the

battery main power supply must not be disconnected to

prevent the heater from overheating by response of the

overheat protection. When performing long time repairs

on the heater its removal is compulsory. After repairs on

the heating circuit it must be replenished with a mixture of

coolant and water to manufacturer's instructions followed

by careful bleeding of the circuit. Repairs requiring a

change of location the relevant installation instructions

and the vehicle specific heater installation proposal have

to be observed.

8.3 Work on the Vehicle

CAUTION

In the vicinity of the heater a temperature of 120° C must

under no circumstances be exceeded (e.g. during paint

work on the vehicle).

8.4 Heater Test Run

The heater must not be operated, not even with the timer,

in enclosed areas like garages or workshops not provided

with exhaust ventilation facilities.

8.5 Servicing

To ensure functional reliability of the heater the following

servicing must be performed in regular intervals:

• clean air heater exterior (prevent the ingress of water).

• examine electrical connections for corrosion of

contacts and for security.

• inspect combustion air and exhaust ducting for

damage and obstructions.

• inspect fuel lines and fuel filter for leakage.

• inspect coolant circuit and circulation pump

(Thermo Top E and C only) for leakage.

• inspect hoses for cracks.

• replace fuel filter, if installed.

8.6 Visual Inspections and Installation

Regulations

8.6.1 Connection to Vehicle Cooling System

The installation location of the heater should be as low as

possible to ensure self-venting of the heater and circulation

pump. This applies in particular to the circulation pump

(Thermo Top E and C only), which is not self-sucking.

The circulation pump may be installed in the location

provided on the heater or remote from the heater

integrated in the coolant circuit. The correct direction of

flow through the heater must be observed (coolant outlet

on top, coolant inlet on bottom), otherwise malfunctions

may result.

The heater is to be connected to the vehicle cooling

system according to Fig. 801 or 802. The amount of

coolant used in the circuit must be at least 4 litres.

The heater integration into the cooling circuit must be

upstream of the vehicle's own heat exchanger.

Fig. 801

"Inline Integration" in the Engine Water Cooling Circuit

Motor

WEBASTO

1 Motor mit Wasserpumpe

2 Kühler

3 Kühlerthermostat

4 Ausgleichsbehälter

5 Heizgerät

6 Umwälzpumpe (Option)

7 WT mit Gebläse

normaler Heizwasserkreislauf

Heizwasserkreislauf bei Betrieb

der Webasto Standheizung

Normal heating water circuit

Heating water circuit when operating

1 Engine with water pump

2Radiator

3 Radiator thermostat

4 Compensation vessel

5Heater

6 Circulation pump

(option)

7 Heat exchanger with fan

Engine

with Webasto auxiliary heater

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 45 46

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Webasto Thermo Top C - PME Service Manual Page 32

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