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Low voltage (signal cables), example figure 61
0-30V
6-8mm
26-30mm
Fig. 61 Low voltage (signal cables) preparation
5.5.3
External controls - Domestic installations
Appliance external control connections example
External frost protection:
▶ Proprietary external frost protection will only be able to be used if
external 230V controls are fitted (wired in parallel to the external
230V controls).
Worcester weather-compensating controls have built-in external
frost protection functionality ( Worcester controller Instructions
manual).
▶ The electrical power supply to the external equipment [2] is supplied
from LS (Live), NS (Neutral) terminals and PE - \ (earth) from the
earth bar.
▶ The Switch Live from the external equipment [3]:
– Heating (()/ zone controls connects to LR (Live Return)
terminal, remove the pre-wired link.
▶ External frost thermostat connections [4]:
– The Live supply is terminal LS.
– The Switch Live is terminal LR.
1
230V AC
L
- L
S
R
Fig. 62 External controls connections example
[1]
230V mains supply to the appliance.
[2]
230V supply from the appliance to the external controls.
[3]
Heating (()/ zone Switch Live (Demand) from the external
controls.
[4]
External frost protection Live supply and Switch Live (Demand).
Greenstar 1000 – 6721835943 (2023/08)
L
2
N
3
L
R
OUT
4
IN
0010042687-002
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.
▶ Inspect the entire gas installation, including the meter and conduct a
tightness test in accordance to the latest gas safety technical
regulations and guidelines (e.g. UK standards advice found in BS
6891).
▶ Check the gas type specified on the identification plate matches that
of the gas supply and that the gas supply is properly purged.
▶ Check that the appliance is filled with water and under pressure (1.3
to 1.7 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 pipework 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 according to table 17 (page 31) (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 7.5 and 9.5 or the
appliance warranty will be invalidated.
Commissioning
41
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