Bosch WORCESTER GREENSTORE Operations Instructions download pdf (Page 18)

INSTALLATION

6 720 645 752 (2012/05)18

CONNECTING THE IMMERSION HEATER (HEATERS CONFORM TO

EN60335.2.73)

It is essential that the water level within the tank or cylinder is such that

water fully covers the heating elements to a depth of at least 100 mm.

Under no circumstances must the heater be permitted to run dry -

serious damage may result to the heater in addition to danger of

personal injury & damage to property.

Check the heater for possible leakage before wiring. See below for

schematic wiring diagram.

Wire the heater through a double-pole fused spur, having contact

separation of at least 3 mm, with a minimum breaking capacity of

13 Amps.

Use a rigid cable, 2 m long max, with 1.5 mm

cross-section and a

temperature resistance of at least 85°C. Rubber Insulated HOFR

Sheathed, complying with BS6141 Table 8. It must be fully earthed.

Ensure all terminal connections are securely made. Do not however use

excessive force when tightening the terminal screws.

NEMKO Approval will only apply to this heater if the Thermowatt RTS

plus thermostat is used.

Immersion heater conforms with EEC Directive 76/889 for Radio

Interference and comply with BS800: 1977.

WIRING THE IMMERSION HEATER:

B Remove the terminal cover from the immersion heater. Use the

accessories supplied in the plastic bag located under the cover of the

immersion heater to complete the wiring.

Fig. 13 Wiring diagram

E Earth (Green/Yellow)

N Neutral (Blue)

LLive (Brown)

Fig. 14 Rigid cable end preparation

E Earth (Green/Yellow)

N Neutral (Blue)

LLive (Brown)

B Provide 90 mm length for the Live (L) and Neutral (N) cables and bare

the end of each cable 8 mm minimum.

B Provide 105 mm length for the Earth cable (E) and bare the end of the

cable 20 mm minimum. Make a circle with the end of the Earth cable

(E) to turn around the earth stud (1) to ensure a full contact between

the cup washer (6) and the plain washer (4) (refer to the fitment of

earth cable to stud).

B Fit the Live and Neutral cables on the thermostat.

Fig. 15 Fitment of earth cable to stud

[1] Earth stud

[2] Nuts (x2) *

[3] Shake-proof washer *

[4] Plain washer *

[5] Earth cable

[6] Cup washer *

[*] supplied in the plastic bag

B Ensure the mains voltage corresponds to the voltage

rating of the heater as shown on the rating label on the

terminal cover.

B Only use rigid wires 1.5 mm

for main supply. Flexible

wire may cause poor electrical connection to the

heater, resulting in overheat.

B When connecting the thermostat please ensure the

male pins are securely located within the female

sockets.

B Accessories (washers, cable grip, screws…)

delivered in the plastic bag under the terminal cover

of the heater have to be used to complete the

connection to the earth and to fix the rigid cable.

DANGER: Risk of electric shock!

B Isolate from mains supply.

B This heater must be earthed.

AQU-32-3W

AQU-33-3W

105

L = 2 m max

(3x1.5 mm² - 85 °C)

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Bosch WORCESTER GREENSTORE Operations Instructions Page 18

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