Repair manual

21
Installation example
The HYDRONIC is installed into the coolant circuit of the
vehicle.
Another installation variant is to install a separate coolant
circuit for the HYDRONIC with an expansion tank.
3 / Installation
Coolant circuit
Warning: contact with hot parts could cause burning.
• The coolant and the coolant circuit components can get
very hot.
- Lay and attach water-carrying parts in such a way that
there is no danger of burning to humans, animals or any
temperature-sensitive material from either heat radiation
or direct contact.
- Prior to working on the coolant circuit, switch off the
HYDRONIC and wait until all components have cooled
down completely, if necessary wearing gloves.
Please note!
• When installing the HYDRONIC, note carefully the direction
of flow of the coolant circuit.
• The water hoses must be laid in such a way that they are
buckle-free and if possible are sloping upwards.
• When laying the water hoses, make sure you leave a
sufficient gap between hoses and any hot parts of the
vehicle.
• All water pipes must be protected against chafing and
excessively high temperatures.
The diagram shows the HYDRONIC integrated into the coolant
circuit of a bus.
Convector heater
Convector heater
Convector heater
Space heater
Space heater
Space heater
To veh. engine or
expansion tank
From veh. engine or
expansion tank
Front heater
HYDRONIC
Water pump
Drawing 16
• Secure all hose connections with hose clips (fastening
torque 1.5 Nm).
• Re-tighten the hose clips after the vehicle has been in
operation for 2 hours or 100 km have been driven.
• The minimum water through-flow is only guaranteed if the
difference in temperature between the heating medium inlet
and outlet does not exceed 10°C during combustion.
• There must be at least 10 litres of coolant in the coolant
circuit.
• Only relief pressure valves with an opening pressure of
min. 0.4 - max. 2 bar may be used in the coolant circuit.
• Before using the heater for the first time or after changing
the coolant, the entire coolant circuit must be bled so
that it is bubble-free in accordance with the manufacturer‘s
specification and, if necessary, it must then be topped up
with coolant approved by the vehicle manufacturer.
Water circulation system