HYDRONIC 10.pdf - VW-Bus-T4.de
HYDRONIC 10.pdf - VW-Bus-T4.de
HYDRONIC 10.pdf - VW-Bus-T4.de
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Connection to the cooling water circuit<br />
The pressure in the cooling water circuit must be<br />
limited by a pressure relief valve (e.g. radiator filler<br />
cap) to a maximum of 2 bars gauge pressure.<br />
There are four possibilities to do so:<br />
1. Using a thermostat in the supply line<br />
to the heater.<br />
Initially, the heat from the additional heater is<br />
supplied only to the driver’s cab up to a cooling<br />
water temperature of about 70 °C = small circuit,<br />
rapid heating.<br />
If the cooling water temperature rises further, the<br />
thermostat changes gradually (changeover<br />
completed at 75 °C) to the large circuit = additional<br />
engine preheating.<br />
Important!<br />
When operating with an additional heater, the<br />
heating valve must always be wide open.<br />
Recommendation:<br />
Use a switch with an N / C limit position contact for<br />
all heating circuits.<br />
Very important:<br />
Make the connections 1, 2 and 3 as shown in the<br />
sketch.<br />
Expansion Tank<br />
Flow only possible when<br />
engine is running<br />
Heater valve<br />
Thermostat, Ø 20 mm<br />
Order No. 330 00 124<br />
Radiator<br />
Radiator<br />
thermostat<br />
Water<br />
pump<br />
Engine<br />
t>75 °C<br />
Thermostat<br />
t75 °C<br />
Thermostat<br />
t
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