Electrical - Worcester Greenstar Highflow 440CDi ERP Installation, Commissioning And Servicing Instructions

INSTALLATION
4.7

Electrical

CAUTION: ISOLATE THE 230V ELECTRICITY SUPPLY
▶ Ensure that the electricity supply is safely Isolated
and secured to prevent inadvertent re-connection.
Information on safe isolation can be found in the
Health and Safety Executive guidance HSG85.
Using test equipment approved to GS38 confirm that
the electricity supply is disconnected
▶ The mains electrical supply to the boiler and system
wiring centre must be common and through either a
common fused double pole isolator or a fused three
pin plug and unswitched socket.
▶ The isolator shall be sited next to the boiler for new
systems and where practicable, replacement boilers.
▶ The isolator must have a contact separation of 3mm
minimum between all poles.
▶ Any system connected to the boiler must not have a
separate electrical supply.
▶ External fuse 3 Amps.
▶ When stripping wires ensure copper strands do not
fall into the control box.
List of wiring connections
L Live incoming 230V supply
N Neutral incoming supply
E Earth incoming supply
LS Live Supply to external controls (protected by F1 fuse)
NS Neutral Supply to external controls
LR Live Return (switch wire from external CH controls
FS Frost thermostat live supply
FR Frost thermostat return (switch wire from frost stat)
F & A* Outside temperature sensor (not polarity sensitive)
B & B* EMS BUS connection used with some external controls (not
polarity sensitive)
* These cables must separated from mains cables by at least 100mm
Access to electrical connections
▶ Remove boiler casing to access control panel.
▶ Remove screw [1] and swing the control panel into the service
position.
Fig. 25 Control box in service position
▶ Remove the three screws [2] in the control panel and remove the
connections cover.
▶ Remove the installer module plastic cover [3].
24
Fig. 26 Electrical connections access
Preparing cable clamps
▶ Unclip cable clamp [1].
▶ Cut off the tapered cable entry [2] to suit the cable diameter.
▶ Unscrew cable retaining screw [3].
▶ Prepare the cable as shown in the figure below.
▶ Run the cable [4] through the cable clamp [1] ensuring there is
▶ Tighten the cable retaining screw [3] to secure the cable, on the
Fig. 27 Cable retainers
1
2
ample cable to reach the connectors.
outer sheath, and replace clamp [1] into the control panel.
6-8mm
6-8mm
36-40mm
1
2
4
3
Greenstar Highflow CDi
3
N
L
26-30mm
≥ 5mm
3
ErP - 6720818077 (2016/04)