Bosch GREENSTAR II HE OIL 12/22 Service Manual download pdf (Page 14)

requirements of BS5449: Part 1. The boiler must be fitted with a

spring loaded safety valve set to operate at 3 bar (45 psi) and

the pipe connections made throughout the system must be

capable of sustaining a pressure of up to 3 bar.

Copper pipework must be used through out when installing the

appliance on a sealed system.

The following is a list of major items which must be fitted to the

system:

1. Safety valve – 3 bar

2. Pressure gauge – 0 to 4 bar.

3. Expansion vessel

4. Automatic air vent.

(See Figs. 20 to 25).

10.1 The wiring between the appliance and the electrical supply

shall comply with current IEE Wiring Regulations and any local

regulations which apply.

10.2 To gain access to the electrical terminal strip.

1. Isolate the mains electrical supply.

2. Remove the cabinet top panel by pulling squarely

upwards.

3. Release the two screws securing the terminal connector

protector plate and remove.

10.3 Mains Wiring

Mains supply – 230V AC ~ 50 Hz 5A External Fuse to BS1362.

LIVE - Brown, NEUTRAL - Blue, EARTH - Green/Yellow

Mains Cable: 0.75mm

(24 x 0.20 mm) to BS 6500 Table 16.

The boiler and system controls must be supplied using a single

fused supply.

The mains supply cable should be connected into the terminals

marked L (Live), N (Neutral) and E (Earth) on the appliance

terminal strip and securely held in the cable clamp located in

the left-hand side of the electrical tray base. Feed the cable

between the side panel and the boiler insulation jacket and

route to the connection point avoiding any hot surfaces.

The appliance must be earthed.

10.4 Programmer

(See Fig. 21).

A plug in, colour co-ordinated, 2 channel electronic programmer

is available from Worcester Heat Systems Limited. Full

instructions covering installation and operation of the

programmer are included with the kit. (See Fig. 21a)

The programmer will give fully independent central heating (CH)

and hot water (HW) programmes when the switch on the rear of

the unit is set to P.

If an external programmer is to be fitted to the boiler the link

plug should be removed from the programmer terminal strip.

(See Fig. 21b). The LIVE, NEUTRAL and EARTH wires should be

connected to the LIVE, NEUTRAL and EARTH terminals on the

main terminal strip and the switched lines connected to

terminals 1 and 2.

NOTE: The mains supply cable should not be connected to an

external time switch when a frost thermostat is fitted to the

Greenstar HE standard wiring block.

NOTE: Under no circumstances should the timer be connected

to a separate electrical supply. Safety is assured from a single

fused supply to the boiler.

10.5 Safety Check

In the event of an electrical fault after the installation of the

appliance, the electrical system shall be checked for short

circuits, fuse failure or incorrect polarity of connections.

10.6 Pre-wired Remote “Y” or “S” Plan systems

(See Fig. 22).

If the system is fully pre-wired at a junction box remotely from

the boiler it can be connected to the boiler. The diagram shows

connection details of two proprietary systems (Honeywell and

Invensys).

The WHS facia mounted programmer can be fitted instead of an

external timer to the remote junction box. Remove the link plug

(8 to 9) and connect the programmer plug into the time clock

connector. Connect terminal 1 from the boiler terminal block to

the 'HOT WATER ON' on the remote 10 way junction box.

Connect terminal 2 from the boiler terminal block to the

'HEATING ON' on the remote 10 way junction box..

NOTE: A “Y” Plan requires a live feed from 'HOT WATER OFF '

switch position. In order to achieve this, using a WHS program-

mer, remove the orange wire from terminal 9 and pull back

through the tie wraps. Ensure the brown wire is firmly secured in

terminal 9. Connect the orange wire to terminal 6 and connect

terminal 6 on the boiler terminal block to the 'HOT WATER OFF'

connection at the remote 10 way junction box.

10.8 Honeywell “S” Plan

(See Fig. 23).

The “S” plan provides complete control on installations having

pumped circulation to both the domestic hot water and radiator

circuits.

The domestic hot water and radiator circuits are independently

controlled by two motorised valves via a cylinder thermostat

and a room thermostat. Both thermostats switch the water

circulator and the boiler on and off.

10.9 Honeywell “Y” Plan

(See Fig. 24).

The “Y” Plan provides complete control on installations having

pumped circulation to both the domestic hot water cylinder and

radiator circuits.

The domestic hot water and radiator circuits are controlled by a

3 port motorised valve via a cylinder thermostat and a room

thermostat. Water flow is diverted to either circuit or to both

circuits at the same time. Both thermostats switch the water

circulator and the boiler on and off.

Note: The “Y” plan requires a live feed from the hot water “off”

switch position. In order to achieve this, using a WHS

programmer, remove the orange wire from terminal 9 and pull

back through the tie wraps. Do not attempt to cut the tie wraps.

Ensure that the brown wire is firmly secured in terminal 9.

Connect the orange wire to terminal 6.

10.10 Frost Protection

(See Fig. 25).

For full frost protection a single pole double switch thermostat

should be fitted so that both the boiler and the circulating pump

circuits are energised under frost conditions. Frost protection

will be lost if there is no power supply to the boiler.

10. Electrical

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Bosch GREENSTAR II HE OIL 12/22 Service Manual Page 14

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