MOTOR HOME WATER CIRCUITS

1
MOTOR HOME WATER CIRCUITS

• A BRIEF OVERVIEW OF POSSIBLE SCHEMES

2
Thermo Top
1
2
3
Thermo Top
1 Engine 2 Vehicle Cab Heater 3 Rear Cabin Heater
or calorifier.
Parallel Water Circuit with secondary
supplementary heater.
3
Typical Scheme
Solenoid valve used on larger vehicles to give
a small heating circuit in stand alone mode only.
20x15x15 T Pieces
1
Thermo Top
3
2
4
1 Engine 2 Vehicle Cab Heater 3 Rear Cabin
Heater 4 Calorifier.
4
Thermo Top Z/C - E
4
2
1
Thermo Top
4
1 Engine. 2 Vehicle Cab Heater 3 Water valve. 4
Secondary rear heater units 5 Boiler/Calorifier 6
Fresh Water Tank (coil optional). 7 Waste
Tank. Minimum water circuit required 4 Litres.
5
3
6
7
In-line water circuit giving the option of on the
move heating by Engine/Webasto or stand alone
heating/pre heating by Webasto only. Priority is
given to heating. Water tank heating is optional.
5
Thermo Top Z/C - E
3
4
2
1
Thermo Top
4
1 Engine. 2 Vehicle Cab Heater 3 2 or 3 way
valve. 4 Secondary rear heater units 5
Boiler/Calorifier 6 Fresh Water Tank (coil
optional) 7 Water Valve Minimum water circuit
required 4 Litres.
5
7
6
Island Circuit
Valve 3a is used to allow an inline circuit flow
to the secondary heating circuit from the
Engine/Webasto. In its closed position it allows
the original primary water circuit for cabin
heat/Engine pre heat only.
6
Thermo Top Z/C - E
3
1 Engine. 2 Vehicle Cab Heater 3 2 or 3 way
valve. 4 Secondary rear heater units 5
Boiler/Calorifier 6 Fresh Water Tank (coil
optional) 7 Water valve.
Valve 3 allows selection of heating by
Engine/Webasto to primary and secondary circuits
as required. A small island circuit can be used
for stand alone rear heating only. This is
achieved by stopping the flow to Heater circuit
(2).
Minimum water circuit required 4 Litres.