Eberspracher Airtronic D5 Service Manual download pdf (Page 25)

PRODUCT INFORMATION | 25

2 | HYDRONIC:

OPTIONAL WATER CIRCUITS, ILLUSTRATED BY HYDRONIC 2

1. INLINE WITH NON-RETURN VALVE:

Advantage of water circuit with inline integration“: no loss of efficiency in

vehicle heating systems with heater turned off.

Please note! Non-return valve must be ordered separately, please refer to

the additional parts catalogue for the Order No.

1. Heater

2. Water pump

3. Non-return valve

4. Heat exchanger

5. Vehicle engine

2. WATER CIRCUIT WITH COMFORT INSTALLATION KIT:

Large engines > 2.5 litres and/or large cabs

Advantage changeover from 70 °C, full flow through engine from 75 °C,

installation in engine compartment wherever space available

FUNCTION OF THE THERMOSTAT:

At a cooling water temperature < 70 °C – small cooling water circuit:

Socket 1 – open (to the heater)

Socket 2 – open (to the T-piece)

Socket 3 – closed (to the non-return valve)

At a cooling water temperature < 75 °C – large cooling water circuit:

Socket 1 – open (to the heater)

Socket 2 – closed (to the T-piece)

Socket 3 – open (to the non-return valve)

1. Heater

2. Water pump

3. Thermostat

4. Non-return valve

5. T-piece

6. Heat exchanger

7. Vehicle engine

1. Socket, to the heater

2. Socket, to the T-piece

3. Socket, to the non-return valve

Please note! Use the connections

Item (1), (2) and (3) – as shown in the

sketch – to integrate the thermostat

in the cooling water circuit. Based on

a diameter of 20 mm.

HEATING CHARACTERISTICS:

Small cooling water circuit: Initially, up to a cooling water temperature of

approx. 70 °C, the heater's heat is fed to the vehicle's heat exchanger only –

fast heating of the inside of the vehicle.

Large cooling water circuit: If the cooling water temperature continues

to rise, the thermostat slowly switches over to the large circuit (full

changeover is reached at approx. 75 °C) – heating of the inside of the

vehicle and additional engine pre-heating.

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Eberspracher Airtronic D5 Service Manual Page 25

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