External Controls - Domestic Installations; Commissioning; Pre-Commissioning Checks; Water Treatment - Worcester Greenstar 8000 Life Installation And Maintenance Instructions Manual

Commissioning

5.5.3

External controls - domestic installations

Appliance external control connections example
External 230V single channel timers:
▶ Leave DHW pre-wired link in place.
▶ The electrical power supply to the external equipment [2] is supplied
from 230V OUT - L (Live), N (Neutral) and \ (earth) terminals.
▶ The Switch Live from the external equipment [3]:
– Heating/zone controls connects to (LR terminal, remove CH
pre-wired link only.
– Control for appliance Pre-heat function, optional.
Hot water time controller connects to * LR terminal, remove
pre-wired link (only use when a Worcester controller has been
fitted that does not have DHW pre-heat time control available or
no Worcester controller fitted).
▶ External frost thermostat connections [4]:
– The Live supply is terminal FS
– The Switch Live is terminal FR
1
230V AC
ON/OFF
230V 230V
230V
IN OUT
IN
L N L N L N
Fig. 63 External controls connections example
[1] 230V mains supply to the appliance.
[2] 230V supply from the appliance to the external controls.
[3] CH & DHW Switch Live (Demand) from the external controls.
[4] External frost protection Live supply and Switch Live (Demand).
6 Commissioning
6.1

Pre-Commissioning checks

DANGER
Risk of electric shock!
▶ Isolate electrical components from the power supply (230 V AC)
(fuse, circuit breaker) and secure against unintentional re-
connection before carrying out any work.
Information on safe isolation can be found in the Health and Safety
Executive guidance HSG85.
▶ Check for zero potential before proceeding with work, using test
equipment approved to GS38 to confirm that the electricity supply is
disconnected.
Checks before commissioning:
▶ Check that the service and water pipes are connected correctly.
▶ Check the gas type specified on the identification plate matches that
of the gas supply and that the gas supply is properly purged.
44
L
2
N
LR
3
LR
FS
4
FR
PC0 PW2 PW1
LR LR FS FR L N L N L N
0010035875-002
▶ Appliance converted to sealed system.
– Check that the appliance is filled with water and under pressure
(1.5 bar) and that there are no leaks.
▶ Check that the electrical connections of the appliance are correct:
– Mains electrical supply - 230V, 50Hz
– Compliant earth connection
– Correct polarities.
– External equipment and controls are wired in correctly.
▶ Check that the flue is correctly fitted, airtight, free from any
obstruction and the connections are secure.
▶ Check that the condensate pipe work is connected properly and that
there are no leaks.
NOTICE
If the appliance is not to be commissioned immediately then, after
successfully completing all of the checks and any rectification work:
▶ Isolate the electricity supply.
▶ Isolate the gas supply.
▶ Close the water shut-off valves to the appliance.
▶ Label appropriately.
6.2

Water treatment

Primary system flushing (Central Heating)
Ensure that the system has been cleaned:
• Following the guidance of BS 7593:
– Code of Practice for treatment of water in hot water central
heating systems.
• Overview available in Pre-installation, Cleaning primary systems
section.
Inhibitor (Central Heating):
Add a suitable inhibitor that is compatible with aluminium (or combined
inhibitor/anti-freeze, if the system is exposed to freezing conditions), to
the heating system in accordance with the DWTA code of practice and
manufacturer's guidelines.
The pH value of the system water must be between 6.5 and 8 or the
appliance warranty will be invalidated.
The inhibitor or combined inhibitor/anti-freeze must not cause damage
to the materials within the appliance (aluminium, mild steel, stainless
steel, copper and brass) and any other materials/components within the
system.
▶ Record the date when the inhibitor was added to the system on the
guarantee card.
▶ The concentration level of inhibitor in the system should be checked
every 12 months or sooner if system content is lost.
NOTICE
Sealing agents
Normally the addition of sealing agents to the system water is not
permitted as this can cause problems with deposits left in the heat
exchanger.
▶ In cases where all attempts to find a system micro leak have failed,
Worcester, Bosch Group supports the use of Fernox F4 leak sealer.
Greenstar 8000 Life – 6720883865 (2021/11)