Bedienungsanleitung Bosch AGS20-2 (Seite 12 von 28) (Englisch)

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12 | Commissioning

AGS10-2, AGS10E-2, AGS20-2, AGS50-26 720 811 270 (2015/04)

5.7 Installing temperature sensors

The temperature sensors are not polarity sensitive. There are two

sensors, one identified for the Solar collector and one for the cylinder

storage; ensure that these be installed in the correct sensor pockets.

If the cable of the collector temperature sensor is joined to the sensor

lead going to the controller at a point which is exposed to moisture, a

waterproof junction box must be used [2].

▶ If required, extend the sensor lead with a 2-wire cable [3] on site:

– up to 50 m = 2 x 0.75 mm

– up to 100 m = 2 x 1.5 mm

Fig. 18 Temperature sensor on solar pump station with integral

controller

[1] Collector temperature sensor

[2] Connection point

[3] 2-wire cable (on site)

[4] Fill & drain valve for emptying (not supplied)

[5] Cylinder temperature sensor, bottom

6 Commissioning

6.1 Use of heat transfer fluid

The heat transfer fluid is pre-mixed and ready to use. It guarantees safe

operation within the specified temperature range, protects the system

from frost damage and minimises risk of vaporisation.

The heat transfer medium is biodegradable. A safety data sheet with

further information can be requested from the manufacturer.

Only operate collectors with the following heat transfer medium

(available as an accessory):

6.2 Purging and filling with a hand pump (air vent on roof)

7747006489-19.2ST

524

NOTICE: Collector damage through evaporation in the

solar circuit or frozen water.

▶ Flush and fill the solar system only when the sun is not

shining on the collectors and (if flushing with water)

no frost is expected.

When filling with heat transfer medium, take the

additional volume of the pre-cooling vessel into account

(if installed).

The pre-cooling vessel and the expansion vessel must be

adequately vented.

The pump in the solar pump station is self-venting. Do

not vent it by hand.

CAUTION: Risk of injury through contact with heat

transfer medium

▶ When handling heat transfer fluid, always wear

protective gloves and goggles.

▶ If heat transfer medium comes into contact with skin:

wash off with water and soap.

▶If heat transfer fluid comes into contact with eyes:

thoroughly rinse eyes with running water and if

required seek medical advice.

NOTICE: Using an unsuitable heat transfer medium may

damage the system and will invalidate the warranty.

▶Do not mix heat transfer medium with other heat

transfer media.

▶ If the solar system is not in use for more than 4 weeks,

cover the collectors.

Collector version

Heat transfer

medium

Temperature range

Flat plate Type L – 28 ... +170 °C

Evacuated tube Type LS – 28 ... +170 °C

Table 8

NOTICE: Collector damage.

▶ With vacuum tube collectors, always use pressure

filling ( Chapter 6.2) because water must not be

poured into the collectors.

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