It is not allowed to place a shut-off valve that can be accidentally closed (or left closed)
between the safety valve and the circuit. Correspondingly, placing a shut-off valve on
the safety valve’s discharge side is not allowed.
2.7 Change-over valve (ECO, optional)
Accessory
Change-over valve kit 1
Item code
GEOEXCV1
Description
Includes a change-over valve and valve actuator (item code: 34034063 and
34034064).
Install the change-over valve as indicated in the electric diagram and the piping
diagram. When the valve is not energized, the valve is in position B (for ‘building’),
which is used for space heating. When the valve is energized, the valve position is A
(for ‘aqua’), which is used for heating domestic hot water.
● Lubricate the inner surface of the ferrule before installation.
● Tighten the joint with your fingers until it is as tight as you can get it, then tighten
with a wrench.
● Tighten copper pipe joints 1/2 of a turn and steel pipe joints 1/2 of a turn. Use pipe
support sleeves in soft and half-hard copper pipes.
● Tighten plastic pipes using pipe support sleeves as indicated in the manufacturer’s
instructions. As a general rule, plastic pipes should be tightened 1 1/2 turns.
2.8 DHW tank sensor (ECO)
ECO heat pumps come with the DHW storage tank temperature sensor (TE266)
already connected. The sensor cable is approximately 4.5 m long. The sensor probe’s
diameter is 6 mm and length 50 mm.
Install the sensor in the domestic hot water tank’s sensor pocket as specified in the
piping diagram.
● If a dedicated tank is used, install the sensor in the lower section of the tank.
● If a combined storage tank is used, install the sensor in the upper section of the
tank.
● Install the sensor probe (supplied with the unit) into a sensor pocket designed for
6 mm probes. The sensor pocket needs to extend into the interior of the tank by at
least 150 mm.
Install the sensor in a way that allows it to measure the temperature of the fluid in the
storage tank as accurately as possible. The sensor pocket needs to extend far enough
into the interior of the tank, and the sensor pocket’s internal diameter must be suitable
for the sensor probe’s diameter.
● Use only metallic sensor pockets that won't corrode to any significant degree (from
the outside or the inside) over time.
● The air gap between the probe and the pocket wall should be as small as possible.
If necessary, use thermal paste between the sensor probe and the pocket walls.
● To ensure that the sensor probe remains firmly seated at the bottom of the sensor
pocket, secure the sensor cable with a cable gland.
The cable can be extended if required. Use a regular insulated copper twin cable for
connecting the cable and extending the cable (0.5 mm
2
, length < 40 m).
M8006 2314EN
23 (59)
