13
Optima 310
3.3 Water circuit and tank
Safety valve:
The installer have fitted a safety valve on the cold
water supply pipe for the hot water tank. This valve is a
protection of the tank against excess pressure when the
domestic water expands during heating. The non-return
valve, which is fitted before the safety valve on the cold
water pipe, prevents the water from flowing back into
the cold water pipe. This means that the pressure in the
tank will increase to the maximum pressure permitted by
the safety valve, at which point it will open and allow the
surplus water to escape. If the safety valve did not open,
the tank would burst.
To make sure that the safety valve is working properly,
it should be inspected several times a year. To do this,
press the spring-loaded arm on the safety valve and
see if water comes out of the valve. Damage caused
by a blocked safety valve is not covered by the Genvex
warranty.
Anode:
In order to prevent corrosion of the enamelled hot water
tank, the tank is fitted with a magnesium anode with a
¾“ screw plug. This anode has an estimated life time
of 2-5 years. It is nevertheless important to check that
the anode is intact at all times. This should be done by
inspecting the anode every 2 years and replacing it if
it is corroded and measures only 6-10 mm in diameter.
To inspect the anode, turn off the power supply to the
system and remove the front cover. The hot water tank
has to be drained before the anode can be unscrewed. To
do this, turn off the cold water supply and then attach a
hose to the drain cock so that the water can be disposed
of down the nearest drain. When draining the water from
the tank, turn on a hot water tap to prevent negative
pressure in the tank. When the tank is empty, the anode
can be unscrewed and inspected. When the anode has
been fitted again, close the drain cock and turn the cold
water supply back on to fill the tank with water. When the
tank is full and the cover back on, the power supply can
be switched on again.
3.4 Demounting
The following actions must be taken:
Disconnect the power supply to the unit and disconnect
other connections. Shutoff the fresh water supply valve
and connect a drain hose to the drain valve in order to
drain the water. While draining, a hot tap water valve
should be opened to avoid under pressure in the tank.
The air duct connections are uninstalled and remaining
air channels must be closed to avoid condense water
entrance to the building.
