Operation Manual

Heater & hot water 13

Adria Motorhomes 101

13.1.7 FrostControl (safety / drain valve)

The safety / drain valve is near the heater.

"FrostControl" (Fig. 72/1) is a currentless safety/drain valve. When there is a danger of frost, it

automatically drains the contents of the boiler through a draining socket (Fig. 72/4). If exces-

sive pressure is present in the system, pressure will be automatically intermittently equalised

through the pressure relief valve.

Closing the drain valve:

 Check if the rotary switch (Fig. 72/2) is set to "Operation" (parallel to the water connec-

tion (Fig. 72/3) and is engaged..

It can be manually closed with the snap button (Fig. 72/5) (pressed) and then the boiler

filled only when the temperature at the drain valve is above approx. 7 °C.

 Set the heater to summer or winter mode (Chapter 13.1.2 or 13.1.3) and set the rotary

switch (Fig. 72/2) of the valve (Fig. 72/1) to "Operation". The rotary switch must engage.

 Press the snap button (Fig. 72/5) into the valve until it engages ("closed" position).

 Always keep the drainage pipe (Fig. 72/4) of the safety / drain valve free from contami-

nation (slush, ice, leaves, etc.).

Automatic opening of the drain valve:

When the temperature at the drain valve is below approx. 3 °C, the drain valve will open auto-

matically, the snap button (Fig. 72/5) springs out and the supply of water of the motorhome

drains out through the drainage pipe (Fig. 72/4).

Manual opening of the drain valve:

 Turn the rotary switch (Fig. 72/2) 180° until it eng ages.

The snap button (Fig. 72/5) springs out and the water drains out through the draining

socket (Fig. 72/4).

Fig. 72 FrostControl Truma Combi

1 Safety / drain valve

2 Rotary switch

3 Water connection

4 Draining socket

5 Snap button