INSTALLATION

1B

C

B

230V

 

MAINS

 

SUPPLY

A

 

D

2/3

G

4

F

 

 

 

E

 

G

 

 

P

Accelerator

resistorROOMSTATM (if fitted)

6

PROGRAMMER (EXTERNAL)

ELECTRICS

DANGER - 230V:

ISOLATE THE MAINS ELECTRICITY SUPPLY BEFORE STARTING ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS.

IMPORTANT: THIS APPLIANCE PROVIDES A PERMENANT EXTERNAL ELECTRICAL SUPPLY FOR SERVICING AND MUST THEREFORE BE FED VIA A CIRCUIT BREAKER INCORPORATING EARTH LEAKAGE PROTECTION.

IMPORTANT: OBSERVE ELECTRONIC STATIC DISCHARGE PRECAUTIONS. DO NOT TOUCH THE PCB CIRCUITS.

WARNING: EXTERNAL EQUIPMENT OPERATED AT 230 VOLTS SHOULD NOT BE SERVICED OR REPAIRED UNDER ADVERSE WEATHER CONDITIONS.

Access to 230V connections:

1 Release screws (B) and remove cover panel (C) from control box (A).

2Release screws (D) from cable clamp (E). Pull inner clamp part (F) outwards.

Feed sufficient power cable (G) through the cable clamp (E) and secure grip with screw (D). Separate wires from cable end and strip to 6mm.

230V connections (terminal block X1):

3 Connect LIVE wire (Brown) to terminal L.

Connect NEUTRAL wire (Blue) to

terminal N.

Connect EARTH wire (Green/Yellow) to

Neutral (if required)

Switched Live

Live

FROST

STAT(1)

7k

Ns Fs FR LR Ls FR

5

CH channel

 

 

 

clock

 

 

 

 

 

HW channel

 

 

 

FROST

 

 

 

 

STAT(2)

 

 

HW Demand

CH Demand

7

M

L Supply

X2

SupplyN

N

 

 

 

 

 

 

 

 

L

 

 

 

 

DHW

 

 

 

 

CH

 

 

 

the connector

 

 

 

 

 

.

 

 

 

 

 

 

 

 

 

 

Route the power cable down the side panel and through the service duct to the internal property connection point avoiding any potentially hot surfaces.

Any external device connected to the boiler must take its power supply from the boiler supply only and must NOT have a separate supply.

External 230V programmer (terminal block X4):

4Remove 4 pin plug (M) from X4.

Remove test links (P) from plug block (M). Connect wires to plug block (M) as shown. Fit plug into terminal block X4.

Connect earth to terminal block X1connector .

230V room thermostat (terminal block X2):

6Remove link (K).

Connect LIVE supply to terminal LS.

Connect SWITCHED LIVE supply to terminal LR.

NOTE: This is sometimes refered to as ‘call for heat’ or ‘heating load’.

27

CONTROLFuse

BOARD

X4

Connect NEUTRAL to terminal Ns. NOTE: Some devices do not require this.

Refit electric control panel cover:

Refit panel (C) and secure with screws (B).

NOTE: Both frost thermostats are fitted as standard to the external appliance to provide frost protection.

ELECTRICS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32 8 716 113 389b (09/07)

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Bosch Appliances 25/32kW, 18/25, 12/18 instruction manual Mains, Programmer External Electrics, Board

25/32kW, 12/18, 18/25 specifications

Bosch Appliances has carved out a reputation for engineering high-performance heating solutions, particularly with their range of heating systems including the 18/25, 12/18, and 25/32 kW models. These systems are designed to meet the diverse needs of residential and commercial spaces while maintaining energy efficiency and sustainability.

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