Operation Manual

Gas system

80 Caravan - 10-13 - EN

8.7 Duomatic switching facility

The Duomatic is an automatic switching facility with a remote display for a two-

bottle gas system. The Duomatic switching facility automatically switches gas

supply from the primary bottle to the reserve bottle as soon as the primary bottle

is either empty or no longer ready for operation. The gas appliances may still con-

tinue operation. The Duomatic switching facility is suitable for all commercial gas

bottles from 3 kg to 33 kg.

Construction of the unit The Duomatic switching facility consists of a central regulator (Fig. 82,3) and a

switching regulator (Fig. 82,5). The knob (Fig. 82,6) on the switching regulator is

used to select which of the gas bottles is to be used as a primary bottle and which

is to be used as a reserve bottle.

Both regulators are equipped with a pressure controller and the regulator defroster

Eis-Ex. This prevents damage to the gas system during the winter months.

The pressure gauge (Fig. 82,2) on the central regulator indicates the pressure in the

gas bottle, not the filling level of the gas bottle. The pressure gauge can be used to

test the impermeability of the gas bottle.

Only the electrical functions can be switched at the operating unit (Fig. 83). The

regulator taps on the gas bottles (Fig. 82,1 and 4) must be opened manually.

The central regulator provides a constant gas pressure, regardless of which gas

bottle is being drawn upon. The two indicator lamps on the operating unit show

which gas bottle can be used to provide gas. When both indicator lamps are illumi-

nated, the position of the knob on the switching regulator indicates which gas

bottle is currently being drawn upon.

X Do not use the switching facility in closed spaces.

Z If the vehicle is equipped with a panel of the DT series and the switching facility

is operated via this panel, the operating unit is not required.

Z Further information can be obtained in the device manufacturer's instruction

manual.

Fig. 82 Duomatic switching facility Fig. 83 Operating unit

Z In case of operation with only one gas bottle (e.g. in summer) connect the cen-

tral regulator to this gas bottle. Set the knob at the switching regulator to the

red area.